src/filter_zoom.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2012 Index Data
   3
   4 Metaproxy is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Metaproxy is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18
  19 #include "config.hpp"
  20
  21 #include <stdlib.h>
  22 #include <sys/types.h>
  23 #include "filter_zoom.hpp"
  24 #include <metaproxy/package.hpp>
  25 #include <metaproxy/util.hpp>
  26 #include <metaproxy/xmlutil.hpp>
  27 #include "torus.hpp"
  28
  29 #include <libxslt/xsltutils.h>
  30 #include <libxslt/transform.h>
  31
  32 #include <boost/thread/mutex.hpp>
  33 #include <boost/thread/condition.hpp>
  34
  35 #include <yaz/yaz-version.h>
  36 #include <yaz/tpath.h>
  37 #include <yaz/srw.h>
  38 #include <yaz/ccl_xml.h>
  39 #include <yaz/ccl.h>
  40 #include <yaz/rpn2cql.h>
  41 #include <yaz/rpn2solr.h>
  42 #include <yaz/pquery.h>
  43 #include <yaz/cql.h>
  44 #include <yaz/oid_db.h>
  45 #include <yaz/diagbib1.h>
  46 #include <yaz/log.h>
  47 #include <yaz/zgdu.h>
  48 #include <yaz/querytowrbuf.h>
  49 #include <yaz/sortspec.h>
  50 #include <yaz/tokenizer.h>
  51 #include <yaz/zoom.h>
  52
  53 namespace mp = metaproxy_1;
  54 namespace yf = mp::filter;
  55
  56 namespace metaproxy_1 {
  57     namespace filter {
  58         class Zoom::Searchable : boost::noncopyable {
  59           public:
  60             std::string authentication;
  61             std::string cfAuth;
  62             std::string cfProxy;
  63             std::string cfSubDB;
  64             std::string udb;
  65             std::string target;
  66             std::string query_encoding;
  67             std::string sru;
  68             std::string sru_version;
  69             std::string request_syntax;
  70             std::string element_set;
  71             std::string record_encoding;
  72             std::string transform_xsl_fname;
  73             std::string transform_xsl_content;
  74             std::string urlRecipe;
  75             std::string contentConnector;
  76             std::string sortStrategy;
  77             bool use_turbomarc;
  78             bool piggyback;
  79             CCL_bibset ccl_bibset;
  80             std::map<std::string, std::string> sortmap;
  81             Searchable(CCL_bibset base);
  82             ~Searchable();
  83         };
  84         class Zoom::Backend : boost::noncopyable {
  85             friend class Impl;
  86             friend class Frontend;
  87             std::string zurl;
  88             WRBUF m_apdu_wrbuf;
  89             ZOOM_connection m_connection;
  90             ZOOM_resultset m_resultset;
  91             std::string m_frontend_database;
  92             SearchablePtr sptr;
  93             xsltStylesheetPtr xsp;
  94             std::string content_session_id;
  95             bool enable_cproxy;
  96             bool enable_explain;
  97             xmlDoc *explain_doc;
  98         public:
  99             Backend();
 100             ~Backend();
 101             void connect(std::string zurl, int *error, char **addinfo,
 102                          ODR odr);
 103             void search(ZOOM_query q, Odr_int *hits,
 104                         int *error, char **addinfo, ODR odr);
 105             void present(Odr_int start, Odr_int number, ZOOM_record *recs,
 106                          int *error, char **addinfo, ODR odr);
 107             void set_option(const char *name, const char *value);
 108             void set_option(const char *name, std::string value);
 109             const char *get_option(const char *name);
 110             void get_zoom_error(int *error, char **addinfo, ODR odr);
 111         };
 112         class Zoom::Frontend : boost::noncopyable {
 113             friend class Impl;
 114             Impl *m_p;
 115             bool m_is_virtual;
 116             bool m_in_use;
 117             yazpp_1::GDU m_init_gdu;
 118             BackendPtr m_backend;
 119             void handle_package(mp::Package &package);
 120             void handle_search(mp::Package &package);
 121
 122             BackendPtr explain_search(mp::Package &package,
 123                                       std::string &database,
 124                                       int *error,
 125                                       char **addinfo,
 126                                       mp::odr &odr,
 127                                       std::string &torus_db,
 128                                       std::string &realm);
 129             void handle_present(mp::Package &package);
 130             BackendPtr get_backend_from_databases(mp::Package &package,
 131                                                   std::string &database,
 132                                                   int *error,
 133                                                   char **addinfo,
 134                                                   mp::odr &odr,
 135                                                   int *proxy_step);
 136
 137             bool create_content_session(mp::Package &package,
 138                                         BackendPtr b,
 139                                         int *error,
 140                                         char **addinfo,
 141                                         ODR odr,
 142                                         std::string authentication,
 143                                         std::string proxy,
 144                                         std::string realm);
 145
 146             void prepare_elements(BackendPtr b,
 147                                   Odr_oid *preferredRecordSyntax,
 148                                   const char *element_set_name,
 149                                   bool &enable_pz2_retrieval,
 150                                   bool &enable_pz2_transform,
 151                                   bool &assume_marc8_charset);
 152
 153             Z_Records *get_records(Package &package,
 154                                    Odr_int start,
 155                                    Odr_int number_to_present,
 156                                    int *error,
 157                                    char **addinfo,
 158                                    Odr_int *number_of_records_returned,
 159                                    ODR odr, BackendPtr b,
 160                                    Odr_oid *preferredRecordSyntax,
 161                                    const char *element_set_name);
 162             Z_Records *get_explain_records(Package &package,
 163                                            Odr_int start,
 164                                            Odr_int number_to_present,
 165                                            int *error,
 166                                            char **addinfo,
 167                                            Odr_int *number_of_records_returned,
 168                                            ODR odr, BackendPtr b,
 169                                            Odr_oid *preferredRecordSyntax,
 170                                            const char *element_set_name);
 171
 172             void log_diagnostic(mp::Package &package,
 173                                 int error, const char *addinfo);
 174         public:
 175             Frontend(Impl *impl);
 176             ~Frontend();
 177         };
 178         class Zoom::Impl {
 179             friend class Frontend;
 180         public:
 181             Impl();
 182             ~Impl();
 183             void process(metaproxy_1::Package & package);
 184             void configure(const xmlNode * ptr, bool test_only,
 185                            const char *path);
 186         private:
 187             void configure_local_records(const xmlNode * ptr, bool test_only);
 188             FrontendPtr get_frontend(mp::Package &package);
 189             void release_frontend(mp::Package &package);
 190             SearchablePtr parse_torus_record(const xmlNode *ptr);
 191             struct cql_node *convert_cql_fields(struct cql_node *cn, ODR odr);
 192             std::map<mp::Session, FrontendPtr> m_clients;
 193             boost::mutex m_mutex;
 194             boost::condition m_cond_session_ready;
 195             std::string torus_searchable_url;
 196             std::string torus_content_url;
 197             std::string default_realm;
 198             std::map<std::string,std::string> fieldmap;
 199             std::string xsldir;
 200             std::string file_path;
 201             std::string content_proxy_server;
 202             std::string content_tmp_file;
 203             bool apdu_log;
 204             CCL_bibset bibset;
 205             std::string element_transform;
 206             std::string element_raw;
 207             std::string proxy;
 208             xsltStylesheetPtr explain_xsp;
 209             std::map<std::string,SearchablePtr> s_map;
 210         };
 211     }
 212 }
 213
 214
 215 static xmlNode *xml_node_search(xmlNode *ptr, int *num, int m)
 216 {
 217     while (ptr)
 218     {
 219         if (ptr->type == XML_ELEMENT_NODE &&
 220             !strcmp((const char *) ptr->name, "recordData"))
 221         {
 222             (*num)++;
 223             if (m == *num)
 224                 return ptr;
 225         }
 226         else  // else: we don't want to find nested nodes
 227         {
 228             xmlNode *ret_node = xml_node_search(ptr->children, num, m);
 229             if (ret_node)
 230                 return ret_node;
 231         }
 232         ptr = ptr->next;
 233     }
 234     return 0;
 235 }
 236
 237 // define Pimpl wrapper forwarding to Impl
 238
 239 yf::Zoom::Zoom() : m_p(new Impl)
 240 {
 241 }
 242
 243 yf::Zoom::~Zoom()
 244 {  // must have a destructor because of boost::scoped_ptr
 245 }
 246
 247 void yf::Zoom::configure(const xmlNode *xmlnode, bool test_only,
 248                          const char *path)
 249 {
 250     m_p->configure(xmlnode, test_only, path);
 251 }
 252
 253 void yf::Zoom::process(mp::Package &package) const
 254 {
 255     m_p->process(package);
 256 }
 257
 258
 259 // define Implementation stuff
 260
 261 yf::Zoom::Backend::Backend()
 262 {
 263     m_apdu_wrbuf = wrbuf_alloc();
 264     m_connection = ZOOM_connection_create(0);
 265     ZOOM_connection_save_apdu_wrbuf(m_connection, m_apdu_wrbuf);
 266     m_resultset = 0;
 267     xsp = 0;
 268     enable_cproxy = true;
 269     enable_explain = false;
 270     explain_doc = 0;
 271 }
 272
 273 yf::Zoom::Backend::~Backend()
 274 {
 275     if (xsp)
 276         xsltFreeStylesheet(xsp);
 277     if (explain_doc)
 278         xmlFreeDoc(explain_doc);
 279     ZOOM_connection_destroy(m_connection);
 280     ZOOM_resultset_destroy(m_resultset);
 281     wrbuf_destroy(m_apdu_wrbuf);
 282 }
 283
 284
 285 void yf::Zoom::Backend::get_zoom_error(int *error, char **addinfo,
 286                                        ODR odr)
 287 {
 288     const char *msg = 0;
 289     const char *zoom_addinfo = 0;
 290     const char *dset = 0;
 291     int error0 = ZOOM_connection_error_x(m_connection, &msg,
 292                                          &zoom_addinfo, &dset);
 293     if (error0)
 294     {
 295         if (!dset)
 296             dset = "Unknown";
 297
 298         if (!strcmp(dset, "info:srw/diagnostic/1"))
 299             *error = yaz_diag_srw_to_bib1(error0);
 300         else if (!strcmp(dset, "Bib-1"))
 301             *error = error0;
 302         else
 303             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 304
 305         *addinfo = (char *) odr_malloc(
 306             odr, 30 + strlen(dset) + strlen(msg) +
 307             (zoom_addinfo ? strlen(zoom_addinfo) : 0));
 308         **addinfo = '\0';
 309         if (zoom_addinfo && *zoom_addinfo)
 310         {
 311             strcpy(*addinfo, zoom_addinfo);
 312             strcat(*addinfo, " ");
 313         }
 314         sprintf(*addinfo + strlen(*addinfo), "(%s %d %s)", dset, error0, msg);
 315     }
 316 }
 317
 318 void yf::Zoom::Backend::connect(std::string zurl,
 319                                 int *error, char **addinfo,
 320                                 ODR odr)
 321 {
 322     ZOOM_connection_connect(m_connection, zurl.c_str(), 0);
 323     get_zoom_error(error, addinfo, odr);
 324 }
 325
 326 void yf::Zoom::Backend::search(ZOOM_query q, Odr_int *hits,
 327                                int *error, char **addinfo, ODR odr)
 328 {
 329     ZOOM_resultset_destroy(m_resultset);
 330     m_resultset = ZOOM_connection_search(m_connection, q);
 331     get_zoom_error(error, addinfo, odr);
 332     if (*error == 0)
 333         *hits = ZOOM_resultset_size(m_resultset);
 334     else
 335         *hits = 0;
 336 }
 337
 338 void yf::Zoom::Backend::present(Odr_int start, Odr_int number,
 339                                 ZOOM_record *recs,
 340                                 int *error, char **addinfo, ODR odr)
 341 {
 342     ZOOM_resultset_records(m_resultset, recs, start, number);
 343     get_zoom_error(error, addinfo, odr);
 344 }
 345
 346 void yf::Zoom::Backend::set_option(const char *name, const char *value)
 347 {
 348     ZOOM_connection_option_set(m_connection, name, value);
 349     if (m_resultset)
 350         ZOOM_resultset_option_set(m_resultset, name, value);
 351 }
 352
 353 void yf::Zoom::Backend::set_option(const char *name, std::string value)
 354 {
 355     set_option(name, value.c_str());
 356 }
 357
 358 const char *yf::Zoom::Backend::get_option(const char *name)
 359 {
 360     return ZOOM_connection_option_get(m_connection, name);
 361 }
 362
 363 yf::Zoom::Searchable::Searchable(CCL_bibset base)
 364 {
 365     piggyback = true;
 366     use_turbomarc = true;
 367     sortStrategy = "embed";
 368     urlRecipe = "${md-electronic-url}";
 369     ccl_bibset = ccl_qual_dup(base);
 370 }
 371
 372 yf::Zoom::Searchable::~Searchable()
 373 {
 374     ccl_qual_rm(&ccl_bibset);
 375 }
 376
 377 yf::Zoom::Frontend::Frontend(Impl *impl) :
 378     m_p(impl), m_is_virtual(false), m_in_use(true)
 379 {
 380 }
 381
 382 yf::Zoom::Frontend::~Frontend()
 383 {
 384 }
 385
 386 yf::Zoom::FrontendPtr yf::Zoom::Impl::get_frontend(mp::Package &package)
 387 {
 388     boost::mutex::scoped_lock lock(m_mutex);
 389
 390     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 391
 392     while(true)
 393     {
 394         it = m_clients.find(package.session());
 395         if (it == m_clients.end())
 396             break;
 397
 398         if (!it->second->m_in_use)
 399         {
 400             it->second->m_in_use = true;
 401             return it->second;
 402         }
 403         m_cond_session_ready.wait(lock);
 404     }
 405     FrontendPtr f(new Frontend(this));
 406     m_clients[package.session()] = f;
 407     f->m_in_use = true;
 408     return f;
 409 }
 410
 411 void yf::Zoom::Impl::release_frontend(mp::Package &package)
 412 {
 413     boost::mutex::scoped_lock lock(m_mutex);
 414     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 415
 416     it = m_clients.find(package.session());
 417     if (it != m_clients.end())
 418     {
 419         if (package.session().is_closed())
 420         {
 421             m_clients.erase(it);
 422         }
 423         else
 424         {
 425             it->second->m_in_use = false;
 426         }
 427         m_cond_session_ready.notify_all();
 428     }
 429 }
 430
 431 yf::Zoom::Impl::Impl() :
 432     apdu_log(false), element_transform("pz2") , element_raw("raw")
 433 {
 434     bibset = ccl_qual_mk();
 435
 436     explain_xsp = 0;
 437     srand((unsigned int) time(0));
 438 }
 439
 440 yf::Zoom::Impl::~Impl()
 441 {
 442     if (explain_xsp)
 443         xsltFreeStylesheet(explain_xsp);
 444     ccl_qual_rm(&bibset);
 445 }
 446
 447 yf::Zoom::SearchablePtr yf::Zoom::Impl::parse_torus_record(const xmlNode *ptr)
 448 {
 449     Zoom::SearchablePtr s(new Searchable(bibset));
 450
 451     for (ptr = ptr->children; ptr; ptr = ptr->next)
 452     {
 453         if (ptr->type != XML_ELEMENT_NODE)
 454             continue;
 455         if (!strcmp((const char *) ptr->name, "layer"))
 456             ptr = ptr->children;
 457         else if (!strcmp((const char *) ptr->name,
 458                          "authentication"))
 459         {
 460             s->authentication = mp::xml::get_text(ptr);
 461         }
 462         else if (!strcmp((const char *) ptr->name,
 463                          "cfAuth"))
 464         {
 465             s->cfAuth = mp::xml::get_text(ptr);
 466         }
 467         else if (!strcmp((const char *) ptr->name,
 468                          "cfProxy"))
 469         {
 470             s->cfProxy = mp::xml::get_text(ptr);
 471         }
 472         else if (!strcmp((const char *) ptr->name,
 473                          "cfSubDB"))
 474         {
 475             s->cfSubDB = mp::xml::get_text(ptr);
 476         }
 477         else if (!strcmp((const char *) ptr->name,
 478                          "contentConnector"))
 479         {
 480             s->contentConnector = mp::xml::get_text(ptr);
 481         }
 482         else if (!strcmp((const char *) ptr->name, "udb"))
 483         {
 484             s->udb = mp::xml::get_text(ptr);
 485         }
 486         else if (!strcmp((const char *) ptr->name, "zurl"))
 487         {
 488             s->target = mp::xml::get_text(ptr);
 489         }
 490         else if (!strcmp((const char *) ptr->name, "sru"))
 491         {
 492             s->sru = mp::xml::get_text(ptr);
 493         }
 494         else if (!strcmp((const char *) ptr->name, "SRUVersion") ||
 495                  !strcmp((const char *) ptr->name, "sruVersion"))
 496         {
 497             s->sru_version = mp::xml::get_text(ptr);
 498         }
 499         else if (!strcmp((const char *) ptr->name,
 500                          "queryEncoding"))
 501         {
 502             s->query_encoding = mp::xml::get_text(ptr);
 503         }
 504         else if (!strcmp((const char *) ptr->name,
 505                          "piggyback"))
 506         {
 507             s->piggyback = mp::xml::get_bool(ptr, true);
 508         }
 509         else if (!strcmp((const char *) ptr->name,
 510                          "requestSyntax"))
 511         {
 512             s->request_syntax = mp::xml::get_text(ptr);
 513         }
 514         else if (!strcmp((const char *) ptr->name,
 515                          "elementSet"))
 516         {
 517             s->element_set = mp::xml::get_text(ptr);
 518         }
 519         else if (!strcmp((const char *) ptr->name,
 520                          "recordEncoding"))
 521         {
 522             s->record_encoding = mp::xml::get_text(ptr);
 523         }
 524         else if (!strcmp((const char *) ptr->name,
 525                          "transform"))
 526         {
 527             s->transform_xsl_fname = mp::xml::get_text(ptr);
 528         }
 529         else if (!strcmp((const char *) ptr->name,
 530                          "literalTransform"))
 531         {
 532             s->transform_xsl_content = mp::xml::get_text(ptr);
 533         }
 534         else if (!strcmp((const char *) ptr->name,
 535                          "urlRecipe"))
 536         {
 537             s->urlRecipe = mp::xml::get_text(ptr);
 538         }
 539         else if (!strcmp((const char *) ptr->name,
 540                          "useTurboMarc"))
 541         {
 542             ; // useTurboMarc is ignored
 543         }
 544         else if (!strncmp((const char *) ptr->name,
 545                           "cclmap_", 7))
 546         {
 547             std::string value = mp::xml::get_text(ptr);
 548             ccl_qual_fitem(s->ccl_bibset, value.c_str(),
 549                            (const char *) ptr->name + 7);
 550         }
 551         else if (!strncmp((const char *) ptr->name,
 552                           "sortmap_", 8))
 553         {
 554             std::string value = mp::xml::get_text(ptr);
 555             s->sortmap[(const char *) ptr->name + 8] = value;
 556         }
 557         else if (!strcmp((const char *) ptr->name,
 558                           "sortStrategy"))
 559         {
 560             s->sortStrategy = mp::xml::get_text(ptr);
 561         }
 562     }
 563     return s;
 564 }
 565
 566 void yf::Zoom::Impl::configure_local_records(const xmlNode *ptr, bool test_only)
 567 {
 568     while (ptr && ptr->type != XML_ELEMENT_NODE)
 569         ptr = ptr->next;
 570
 571     if (ptr)
 572     {
 573         if (!strcmp((const char *) ptr->name, "records"))
 574         {
 575             for (ptr = ptr->children; ptr; ptr = ptr->next)
 576             {
 577                 if (ptr->type != XML_ELEMENT_NODE)
 578                     continue;
 579                 if (!strcmp((const char *) ptr->name, "record"))
 580                 {
 581                     SearchablePtr s = parse_torus_record(ptr);
 582                     if (s)
 583                     {
 584                         std::string udb = s->udb;
 585                         if (udb.length())
 586                             s_map[s->udb] = s;
 587                         else
 588                         {
 589                             throw mp::filter::FilterException
 590                                 ("No udb for local torus record");
 591                         }
 592                     }
 593                 }
 594                 else
 595                 {
 596                     throw mp::filter::FilterException
 597                         ("Bad element "
 598                          + std::string((const char *) ptr->name)
 599                          + " in zoom filter inside element "
 600                          "<torus><records>");
 601                 }
 602             }
 603         }
 604         else
 605         {
 606             throw mp::filter::FilterException
 607                 ("Bad element "
 608                  + std::string((const char *) ptr->name)
 609                  + " in zoom filter inside element <torus>");
 610         }
 611     }
 612 }
 613
 614 void yf::Zoom::Impl::configure(const xmlNode *ptr, bool test_only,
 615                                const char *path)
 616 {
 617     std::string explain_xslt_fname;
 618
 619     content_tmp_file = "/tmp/cf.XXXXXX.p";
 620     if (path && *path)
 621     {
 622         file_path = path;
 623     }
 624     for (ptr = ptr->children; ptr; ptr = ptr->next)
 625     {
 626         if (ptr->type != XML_ELEMENT_NODE)
 627             continue;
 628         else if (!strcmp((const char *) ptr->name, "torus"))
 629         {
 630             const struct _xmlAttr *attr;
 631             for (attr = ptr->properties; attr; attr = attr->next)
 632             {
 633                 if (!strcmp((const char *) attr->name, "url"))
 634                     torus_searchable_url = mp::xml::get_text(attr->children);
 635                 else if (!strcmp((const char *) attr->name, "content_url"))
 636                     torus_content_url = mp::xml::get_text(attr->children);
 637                 else if (!strcmp((const char *) attr->name, "realm"))
 638                     default_realm = mp::xml::get_text(attr->children);
 639                 else if (!strcmp((const char *) attr->name, "xsldir"))
 640                     xsldir = mp::xml::get_text(attr->children);
 641                 else if (!strcmp((const char *) attr->name, "element_transform"))
 642                     element_transform = mp::xml::get_text(attr->children);
 643                 else if (!strcmp((const char *) attr->name, "element_raw"))
 644                     element_raw = mp::xml::get_text(attr->children);
 645                 else if (!strcmp((const char *) attr->name, "proxy"))
 646                     proxy = mp::xml::get_text(attr->children);
 647                 else if (!strcmp((const char *) attr->name, "explain_xsl"))
 648                     explain_xslt_fname = mp::xml::get_text(attr->children);
 649                 else
 650                     throw mp::filter::FilterException(
 651                         "Bad attribute " + std::string((const char *)
 652                                                        attr->name));
 653             }
 654             // If content_url is not given, use value of searchable, to
 655             // ensure backwards compatibility
 656             if (!torus_content_url.length())
 657                 torus_content_url = torus_searchable_url;
 658             configure_local_records(ptr->children, test_only);
 659         }
 660         else if (!strcmp((const char *) ptr->name, "cclmap"))
 661         {
 662             const char *addinfo = 0;
 663             ccl_xml_config(bibset, ptr, &addinfo);
 664         }
 665         else if (!strcmp((const char *) ptr->name, "fieldmap"))
 666         {
 667             const struct _xmlAttr *attr;
 668             std::string ccl_field;
 669             std::string cql_field;
 670             for (attr = ptr->properties; attr; attr = attr->next)
 671             {
 672                 if (!strcmp((const char *) attr->name, "ccl"))
 673                     ccl_field = mp::xml::get_text(attr->children);
 674                 else if (!strcmp((const char *) attr->name, "cql"))
 675                     cql_field = mp::xml::get_text(attr->children);
 676                 else
 677                     throw mp::filter::FilterException(
 678                         "Bad attribute " + std::string((const char *)
 679                                                        attr->name));
 680             }
 681             if (cql_field.length())
 682                 fieldmap[cql_field] = ccl_field;
 683         }
 684         else if (!strcmp((const char *) ptr->name, "contentProxy"))
 685         {
 686             const struct _xmlAttr *attr;
 687             for (attr = ptr->properties; attr; attr = attr->next)
 688             {
 689                 if (!strcmp((const char *) attr->name, "server"))
 690                     content_proxy_server = mp::xml::get_text(attr->children);
 691                 else if (!strcmp((const char *) attr->name, "tmp_file"))
 692                     content_tmp_file = mp::xml::get_text(attr->children);
 693                 else
 694                     throw mp::filter::FilterException(
 695                         "Bad attribute " + std::string((const char *)
 696                                                        attr->name));
 697             }
 698         }
 699         else if (!strcmp((const char *) ptr->name, "log"))
 700         {
 701             const struct _xmlAttr *attr;
 702             for (attr = ptr->properties; attr; attr = attr->next)
 703             {
 704                 if (!strcmp((const char *) attr->name, "apdu"))
 705                     apdu_log = mp::xml::get_bool(attr->children, false);
 706                 else
 707                     throw mp::filter::FilterException(
 708                         "Bad attribute " + std::string((const char *)
 709                                                        attr->name));
 710             }
 711         }
 712         else
 713         {
 714             throw mp::filter::FilterException
 715                 ("Bad element "
 716                  + std::string((const char *) ptr->name)
 717                  + " in zoom filter");
 718         }
 719     }
 720
 721     if (explain_xslt_fname.length())
 722     {
 723         const char *path = 0;
 724
 725         if (xsldir.length())
 726             path = xsldir.c_str();
 727         else
 728             path = file_path.c_str();
 729
 730         char fullpath[1024];
 731         char *cp = yaz_filepath_resolve(explain_xslt_fname.c_str(),
 732                                         path, 0, fullpath);
 733         if (!cp)
 734         {
 735             throw mp::filter::FilterException
 736                 ("Cannot read XSLT " + explain_xslt_fname);
 737         }
 738
 739         xmlDoc *xsp_doc = xmlParseFile(cp);
 740         if (!xsp_doc)
 741         {
 742             throw mp::filter::FilterException
 743                 ("Cannot parse XSLT " + explain_xslt_fname);
 744         }
 745
 746         explain_xsp = xsltParseStylesheetDoc(xsp_doc);
 747         if (!explain_xsp)
 748         {
 749             xmlFreeDoc(xsp_doc);
 750             throw mp::filter::FilterException
 751                 ("Cannot parse XSLT " + explain_xslt_fname);
 752
 753         }
 754     }
 755 }
 756
 757 bool yf::Zoom::Frontend::create_content_session(mp::Package &package,
 758                                                 BackendPtr b,
 759                                                 int *error, char **addinfo,
 760                                                 ODR odr,
 761                                                 std::string authentication,
 762                                                 std::string proxy,
 763                                                 std::string realm)
 764 {
 765     if (b->sptr->contentConnector.length())
 766     {
 767         char *fname = (char *) xmalloc(m_p->content_tmp_file.length() + 8);
 768         strcpy(fname, m_p->content_tmp_file.c_str());
 769         char *xx = strstr(fname, "XXXXXX");
 770         if (!xx)
 771         {
 772             xx = fname + strlen(fname);
 773             strcat(fname, "XXXXXX");
 774         }
 775         char tmp_char = xx[6];
 776         sprintf(xx, "%06d", ((unsigned) rand()) % 1000000);
 777         xx[6] = tmp_char;
 778
 779         FILE *file = fopen(fname, "w");
 780         if (!file)
 781         {
 782             package.log("zoom", YLOG_WARN|YLOG_ERRNO, "create %s", fname);
 783             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 784             *addinfo = (char *)  odr_malloc(odr, 40 + strlen(fname));
 785             sprintf(*addinfo, "Could not create %s", fname);
 786             xfree(fname);
 787             return false;
 788         }
 789         b->content_session_id.assign(xx, 6);
 790         WRBUF w = wrbuf_alloc();
 791         wrbuf_puts(w, "#content_proxy\n");
 792         wrbuf_printf(w, "connector: %s\n", b->sptr->contentConnector.c_str());
 793         if (authentication.length())
 794             wrbuf_printf(w, "auth: %s\n", authentication.c_str());
 795         if (proxy.length())
 796             wrbuf_printf(w, "proxy: %s\n", proxy.c_str());
 797         if (realm.length())
 798             wrbuf_printf(w, "realm: %s\n", realm.c_str());
 799
 800         fwrite(wrbuf_buf(w), 1, wrbuf_len(w), file);
 801         fclose(file);
 802         package.log("zoom", YLOG_LOG, "content file: %s", fname);
 803         xfree(fname);
 804         wrbuf_destroy(w);
 805     }
 806     return true;
 807 }
 808
 809 yf::Zoom::BackendPtr yf::Zoom::Frontend::get_backend_from_databases(
 810     mp::Package &package,
 811     std::string &database, int *error, char **addinfo, mp::odr &odr,
 812     int *proxy_step)
 813 {
 814     std::list<BackendPtr>::const_iterator map_it;
 815     if (m_backend && m_backend->m_frontend_database == database)
 816         return m_backend;
 817
 818     std::string input_args;
 819     std::string torus_db;
 820     size_t db_arg_pos = database.find(',');
 821     if (db_arg_pos != std::string::npos)
 822     {
 823         torus_db = database.substr(0, db_arg_pos);
 824         input_args = database.substr(db_arg_pos + 1);
 825     }
 826     else
 827         torus_db = database;
 828
 829     std::string authentication;
 830     std::string content_authentication;
 831     std::string proxy;
 832     std::string content_proxy;
 833     std::string realm = m_p->default_realm;
 834
 835     const char *param_user = 0;
 836     const char *param_password = 0;
 837     const char *param_content_user = 0;
 838     const char *param_content_password = 0;
 839     const char *param_nocproxy = 0;
 840     int no_parms = 0;
 841
 842     char **names;
 843     char **values;
 844     int no_out_args = 0;
 845     if (input_args.length())
 846         no_parms = yaz_uri_to_array(input_args.c_str(),
 847                                     odr, &names, &values);
 848     // adding 10 because we'll be adding other URL args
 849     const char **out_names = (const char **)
 850         odr_malloc(odr, (10 + no_parms) * sizeof(*out_names));
 851     const char **out_values = (const char **)
 852         odr_malloc(odr, (10 + no_parms) * sizeof(*out_values));
 853
 854     // may be changed if it's a content connection
 855     std::string torus_url = m_p->torus_searchable_url;
 856     int i;
 857     for (i = 0; i < no_parms; i++)
 858     {
 859         const char *name = names[i];
 860         const char *value = values[i];
 861         assert(name);
 862         assert(value);
 863         if (!strcmp(name, "user"))
 864             param_user = value;
 865         else if (!strcmp(name, "password"))
 866             param_password = value;
 867         else if (!strcmp(name, "content-user"))
 868             param_content_user = value;
 869         else if (!strcmp(name, "content-password"))
 870             param_content_password = value;
 871         else if (!strcmp(name, "content-proxy"))
 872             content_proxy = value;
 873         else if (!strcmp(name, "nocproxy"))
 874             param_nocproxy = value;
 875         else if (!strcmp(name, "proxy"))
 876         {
 877             char **dstr;
 878             int dnum = 0;
 879             nmem_strsplit(((ODR) odr)->mem, ",", value, &dstr, &dnum);
 880             if (*proxy_step >= dnum)
 881                 *proxy_step = 0;
 882             else
 883             {
 884                 proxy = dstr[*proxy_step];
 885
 886                 (*proxy_step)++;
 887                 if (*proxy_step == dnum)
 888                     *proxy_step = 0;
 889             }
 890         }
 891         else if (!strcmp(name, "cproxysession"))
 892         {
 893             out_names[no_out_args] = name;
 894             out_values[no_out_args++] = value;
 895             torus_url = m_p->torus_content_url;
 896         }
 897         else if (!strcmp(name, "realm"))
 898             realm = value;
 899         else if (name[0] == 'x' && name[1] == '-')
 900         {
 901             out_names[no_out_args] = name;
 902             out_values[no_out_args++] = value;
 903         }
 904         else
 905         {
 906             BackendPtr notfound;
 907             char *msg = (char*) odr_malloc(odr, strlen(name) + 30);
 908             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 909             sprintf(msg, "Bad database argument: %s", name);
 910             *addinfo = msg;
 911             return notfound;
 912         }
 913     }
 914     if (param_user)
 915     {
 916         authentication = std::string(param_user);
 917         if (param_password)
 918             authentication += "/" + std::string(param_password);
 919     }
 920     if (param_content_user)
 921     {
 922         content_authentication = std::string(param_content_user);
 923         if (param_content_password)
 924             content_authentication += "/" + std::string(param_content_password);
 925     }
 926
 927     if (torus_db.compare("IR-Explain---1") == 0)
 928         return explain_search(package, database, error, addinfo, odr, torus_db,
 929             realm);
 930
 931     SearchablePtr sptr;
 932
 933     std::map<std::string,SearchablePtr>::iterator it;
 934     it = m_p->s_map.find(torus_db);
 935     if (it != m_p->s_map.end())
 936         sptr = it->second;
 937     else if (torus_url.length() > 0)
 938     {
 939         std::string torus_query = "udb==" + torus_db;
 940         xmlDoc *doc = mp::get_searchable(package,torus_url, torus_db,
 941                                          torus_query,
 942                                          realm, m_p->proxy);
 943         if (!doc)
 944         {
 945             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 946             *addinfo = odr_strdup(odr, database.c_str());
 947             BackendPtr b;
 948             return b;
 949         }
 950         const xmlNode *ptr = xmlDocGetRootElement(doc);
 951         if (ptr)
 952         {   // presumably ptr is a records element node
 953             // parse first record in document
 954             for (ptr = ptr->children; ptr; ptr = ptr->next)
 955             {
 956                 if (ptr->type == XML_ELEMENT_NODE
 957                     && !strcmp((const char *) ptr->name, "record"))
 958                 {
 959                     if (sptr)
 960                     {
 961                         *error = YAZ_BIB1_UNSPECIFIED_ERROR;
 962                         *addinfo = (char*) odr_malloc(odr, 40 + database.length()),
 963                         sprintf(*addinfo, "multiple records for udb=%s",
 964                                  database.c_str());
 965                         xmlFreeDoc(doc);
 966                         BackendPtr b;
 967                         return b;
 968                     }
 969                     sptr = m_p->parse_torus_record(ptr);
 970                 }
 971             }
 972         }
 973         xmlFreeDoc(doc);
 974     }
 975
 976     if (!sptr)
 977     {
 978         *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 979         *addinfo = odr_strdup(odr, database.c_str());
 980         BackendPtr b;
 981         return b;
 982     }
 983
 984     xsltStylesheetPtr xsp = 0;
 985     if (sptr->transform_xsl_content.length())
 986     {
 987         xmlDoc *xsp_doc = xmlParseMemory(sptr->transform_xsl_content.c_str(),
 988                                          sptr->transform_xsl_content.length());
 989         if (!xsp_doc)
 990         {
 991             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 992             *addinfo = (char *) odr_malloc(odr, 40);
 993             sprintf(*addinfo, "xmlParseMemory failed");
 994             BackendPtr b;
 995             return b;
 996         }
 997         xsp = xsltParseStylesheetDoc(xsp_doc);
 998         if (!xsp)
 999         {
1000             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
1001             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
1002             BackendPtr b;
1003             xmlFreeDoc(xsp_doc);
1004             return b;
1005         }
1006     }
1007     else if (sptr->transform_xsl_fname.length())
1008     {
1009         const char *path = 0;
1010
1011         if (m_p->xsldir.length())
1012             path = m_p->xsldir.c_str();
1013         else
1014             path = m_p->file_path.c_str();
1015         std::string fname;
1016
1017         char fullpath[1024];
1018         char *cp = yaz_filepath_resolve(sptr->transform_xsl_fname.c_str(),
1019                                         path, 0, fullpath);
1020         if (cp)
1021             fname.assign(cp);
1022         else
1023         {
1024             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
1025             *addinfo = (char *)
1026                 odr_malloc(odr, 40 + sptr->transform_xsl_fname.length());
1027             sprintf(*addinfo, "File could not be read: %s",
1028                     sptr->transform_xsl_fname.c_str());
1029             BackendPtr b;
1030             return b;
1031         }
1032         xmlDoc *xsp_doc = xmlParseFile(fname.c_str());
1033         if (!xsp_doc)
1034         {
1035             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
1036             *addinfo = (char *) odr_malloc(odr, 40 + fname.length());
1037             sprintf(*addinfo, "xmlParseFile failed. File: %s", fname.c_str());
1038             BackendPtr b;
1039             return b;
1040         }
1041         xsp = xsltParseStylesheetDoc(xsp_doc);
1042         if (!xsp)
1043         {
1044             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
1045             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
1046             BackendPtr b;
1047             xmlFreeDoc(xsp_doc);
1048             return b;
1049         }
1050     }
1051
1052     m_backend.reset();
1053
1054     BackendPtr b(new Backend);
1055
1056     b->sptr = sptr;
1057     b->xsp = xsp;
1058     b->m_frontend_database = database;
1059     b->enable_cproxy = param_nocproxy ? false : true;
1060
1061     if (sptr->query_encoding.length())
1062         b->set_option("rpnCharset", sptr->query_encoding);
1063
1064     b->set_option("timeout", "40");
1065
1066     if (m_p->apdu_log)
1067         b->set_option("apdulog", "1");
1068
1069     if (sptr->piggyback && sptr->sru.length())
1070         b->set_option("count", "1"); /* some SRU servers INSIST on getting
1071                                         maximumRecords > 0 */
1072     b->set_option("piggyback", sptr->piggyback ? "1" : "0");
1073
1074     if (authentication.length() == 0)
1075         authentication = sptr->authentication;
1076
1077     if (proxy.length() == 0)
1078         proxy = sptr->cfProxy;
1079
1080     if (sptr->cfAuth.length())
1081     {
1082         // A CF target
1083         b->set_option("user", sptr->cfAuth);
1084         if (authentication.length())
1085         {
1086             size_t found = authentication.find('/');
1087             if (found != std::string::npos)
1088             {
1089                 out_names[no_out_args] = "user";
1090                 out_values[no_out_args++] =
1091                     odr_strdup(odr, authentication.substr(0, found).c_str());
1092
1093                 out_names[no_out_args] = "password";
1094                 out_values[no_out_args++] =
1095                     odr_strdup(odr, authentication.substr(found+1).c_str());
1096             }
1097             else
1098             {
1099                 out_names[no_out_args] = "user";
1100                 out_values[no_out_args++] =
1101                     odr_strdup(odr, authentication.c_str());
1102             }
1103         }
1104         if (proxy.length())
1105         {
1106             out_names[no_out_args] = "proxy";
1107             out_values[no_out_args++] = odr_strdup(odr, proxy.c_str());
1108         }
1109         if (sptr->cfSubDB.length())
1110         {
1111             out_names[no_out_args] = "subdatabase";
1112             out_values[no_out_args++] = odr_strdup(odr, sptr->cfSubDB.c_str());
1113         }
1114         if (param_nocproxy)
1115         {
1116             out_names[no_out_args] = "nocproxy";
1117             out_values[no_out_args++] = odr_strdup(odr, param_nocproxy);
1118         }
1119     }
1120     else
1121     {
1122         size_t found = authentication.find('/');
1123
1124         if (sptr->sru.length() && found != std::string::npos)
1125         {
1126             b->set_option("user", authentication.substr(0, found));
1127             b->set_option("password", authentication.substr(found+1));
1128         }
1129         else
1130             b->set_option("user", authentication);
1131
1132         if (proxy.length())
1133             b->set_option("proxy", proxy);
1134     }
1135     if (proxy.length())
1136         package.log("zoom", YLOG_LOG, "proxy: %s", proxy.c_str());
1137
1138     std::string url;
1139     if (sptr->sru.length())
1140     {
1141         url = "http://" + sptr->target;
1142         b->set_option("sru", sptr->sru);
1143
1144         if (sptr->sru_version.length())
1145             b->set_option("sru_version", sptr->sru_version);
1146     }
1147     else
1148     {
1149         url = sptr->target;
1150     }
1151     if (no_out_args)
1152     {
1153         char *x_args = 0;
1154         out_names[no_out_args] = 0; // terminate list
1155
1156         yaz_array_to_uri(&x_args, odr, (char **) out_names,
1157                          (char **) out_values);
1158         url += "," + std::string(x_args);
1159     }
1160     package.log("zoom", YLOG_LOG, "url: %s", url.c_str());
1161     b->connect(url, error, addinfo, odr);
1162     if (*error == 0 && b->enable_cproxy)
1163         create_content_session(package, b, error, addinfo, odr,
1164                                content_authentication.length() ?
1165                                content_authentication : authentication,
1166                                content_proxy.length() ? content_proxy : proxy,
1167                                realm);
1168     if (*error == 0)
1169         m_backend = b;
1170     return b;
1171 }
1172
1173 void yf::Zoom::Frontend::prepare_elements(BackendPtr b,
1174                                           Odr_oid *preferredRecordSyntax,
1175                                           const char *element_set_name,
1176                                           bool &enable_pz2_retrieval,
1177                                           bool &enable_pz2_transform,
1178                                           bool &assume_marc8_charset)
1179
1180 {
1181     char oid_name_str[OID_STR_MAX];
1182     const char *syntax_name = 0;
1183
1184     if (preferredRecordSyntax &&
1185         !oid_oidcmp(preferredRecordSyntax, yaz_oid_recsyn_xml)
1186         && element_set_name)
1187     {
1188         if (!strcmp(element_set_name, m_p->element_transform.c_str()))
1189         {
1190             enable_pz2_retrieval = true;
1191             enable_pz2_transform = true;
1192         }
1193         else if (!strcmp(element_set_name, m_p->element_raw.c_str()))
1194         {
1195             enable_pz2_retrieval = true;
1196         }
1197     }
1198
1199     if (enable_pz2_retrieval)
1200     {
1201         std::string configured_request_syntax = b->sptr->request_syntax;
1202         if (configured_request_syntax.length())
1203         {
1204             syntax_name = configured_request_syntax.c_str();
1205             const Odr_oid *syntax_oid =
1206                 yaz_string_to_oid(yaz_oid_std(), CLASS_RECSYN, syntax_name);
1207             if (!oid_oidcmp(syntax_oid, yaz_oid_recsyn_usmarc)
1208                 || !oid_oidcmp(syntax_oid, yaz_oid_recsyn_opac))
1209                 assume_marc8_charset = true;
1210         }
1211     }
1212     else if (preferredRecordSyntax)
1213         syntax_name =
1214             yaz_oid_to_string_buf(preferredRecordSyntax, 0, oid_name_str);
1215
1216     if (b->sptr->sru.length())
1217         syntax_name = "XML";
1218
1219     b->set_option("preferredRecordSyntax", syntax_name);
1220
1221     if (enable_pz2_retrieval)
1222     {
1223         element_set_name = 0;
1224         if (b->sptr->element_set.length())
1225             element_set_name = b->sptr->element_set.c_str();
1226     }
1227
1228     b->set_option("elementSetName", element_set_name);
1229     if (b->sptr->sru.length() && element_set_name)
1230         b->set_option("schema", element_set_name);
1231 }
1232
1233 Z_Records *yf::Zoom::Frontend::get_explain_records(
1234     Package &package,
1235     Odr_int start,
1236     Odr_int number_to_present,
1237     int *error,
1238     char **addinfo,
1239     Odr_int *number_of_records_returned,
1240     ODR odr,
1241     BackendPtr b,
1242     Odr_oid *preferredRecordSyntax,
1243     const char *element_set_name)
1244 {
1245     Odr_int i;
1246     Z_Records *records = 0;
1247
1248     if (!b->explain_doc)
1249     {
1250         return records;
1251     }
1252     if (number_to_present > 10000)
1253         number_to_present = 10000;
1254
1255     xmlNode *ptr = xmlDocGetRootElement(b->explain_doc);
1256
1257     Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
1258         odr_malloc(odr, sizeof(*npl));
1259     npl->records = (Z_NamePlusRecord **)
1260         odr_malloc(odr, number_to_present * sizeof(*npl->records));
1261
1262     for (i = 0; i < number_to_present; i++)
1263     {
1264         int num = 0;
1265         xmlNode *res = xml_node_search(ptr, &num, start + i + 1);
1266         if (!res)
1267             break;
1268         xmlBufferPtr xml_buf = xmlBufferCreate();
1269         xmlNode *tmp_node = xmlCopyNode(res->children, 1);
1270         xmlNodeDump(xml_buf, tmp_node->doc, tmp_node, 0, 0);
1271
1272         Z_NamePlusRecord *npr =
1273             (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1274         npr->databaseName = odr_strdup(odr, b->m_frontend_database.c_str());
1275         npr->which = Z_NamePlusRecord_databaseRecord;
1276         npr->u.databaseRecord =
1277             z_ext_record_xml(odr,
1278                              (const char *) xml_buf->content, xml_buf->use);
1279         npl->records[i] = npr;
1280         xmlFreeNode(tmp_node);
1281         xmlBufferFree(xml_buf);
1282     }
1283     records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1284     records->which = Z_Records_DBOSD;
1285     records->u.databaseOrSurDiagnostics = npl;
1286
1287     npl->num_records = i;
1288     *number_of_records_returned = i;
1289     return records;
1290 }
1291
1292
1293 Z_Records *yf::Zoom::Frontend::get_records(Package &package,
1294                                            Odr_int start,
1295                                            Odr_int number_to_present,
1296                                            int *error,
1297                                            char **addinfo,
1298                                            Odr_int *number_of_records_returned,
1299                                            ODR odr,
1300                                            BackendPtr b,
1301                                            Odr_oid *preferredRecordSyntax,
1302                                            const char *element_set_name)
1303 {
1304     *number_of_records_returned = 0;
1305     Z_Records *records = 0;
1306     bool enable_pz2_retrieval = false; // whether target profile is used
1307     bool enable_pz2_transform = false; // whether XSLT is used as well
1308     bool assume_marc8_charset = false;
1309
1310     prepare_elements(b, preferredRecordSyntax,
1311                      element_set_name,
1312                      enable_pz2_retrieval,
1313                      enable_pz2_transform,
1314                      assume_marc8_charset);
1315
1316     package.log("zoom", YLOG_LOG, "pz2_retrieval: %s . pz2_transform: %s",
1317                 enable_pz2_retrieval ? "yes" : "no",
1318                 enable_pz2_transform ? "yes" : "no");
1319
1320     if (start < 0 || number_to_present <=0)
1321         return records;
1322
1323     if (number_to_present > 10000)
1324         number_to_present = 10000;
1325
1326     ZOOM_record *recs = (ZOOM_record *)
1327         odr_malloc(odr, (size_t) number_to_present * sizeof(*recs));
1328
1329     b->present(start, number_to_present, recs, error, addinfo, odr);
1330
1331     int i = 0;
1332     if (!*error)
1333     {
1334         for (i = 0; i < number_to_present; i++)
1335             if (!recs[i])
1336                 break;
1337     }
1338     if (i > 0)
1339     {  // only return records if no error and at least one record
1340         char *odr_database = odr_strdup(odr,
1341                                         b->m_frontend_database.c_str());
1342         Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
1343             odr_malloc(odr, sizeof(*npl));
1344         *number_of_records_returned = i;
1345         npl->num_records = i;
1346         npl->records = (Z_NamePlusRecord **)
1347             odr_malloc(odr, i * sizeof(*npl->records));
1348         for (i = 0; i < number_to_present; i++)
1349         {
1350             Z_NamePlusRecord *npr = 0;
1351             const char *addinfo;
1352
1353             int sur_error = ZOOM_record_error(recs[i], 0 /* msg */,
1354                                               &addinfo, 0 /* diagset */);
1355
1356             if (sur_error)
1357             {
1358                 log_diagnostic(package, sur_error, addinfo);
1359                 npr = zget_surrogateDiagRec(odr, odr_database, sur_error,
1360                                             addinfo);
1361             }
1362             else if (enable_pz2_retrieval)
1363             {
1364                 char rec_type_str[100];
1365                 const char *record_encoding = 0;
1366
1367                 if (b->sptr->record_encoding.length())
1368                     record_encoding = b->sptr->record_encoding.c_str();
1369                 else if (assume_marc8_charset)
1370                     record_encoding = "marc8";
1371
1372                 strcpy(rec_type_str, b->sptr->use_turbomarc ? "txml" : "xml");
1373                 if (record_encoding)
1374                 {
1375                     strcat(rec_type_str, "; charset=");
1376                     strcat(rec_type_str, record_encoding);
1377                 }
1378
1379                 package.log("zoom", YLOG_LOG, "Getting record of type %s",
1380                             rec_type_str);
1381                 int rec_len;
1382                 xmlChar *xmlrec_buf = 0;
1383                 const char *rec_buf = ZOOM_record_get(recs[i], rec_type_str,
1384                                                       &rec_len);
1385                 if (!rec_buf && !npr)
1386                 {
1387                     std::string addinfo("ZOOM_record_get failed for type ");
1388
1389                     int error = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
1390                     addinfo += rec_type_str;
1391                     log_diagnostic(package, error, addinfo.c_str());
1392                     npr = zget_surrogateDiagRec(odr, odr_database,
1393                                                 error, addinfo.c_str());
1394                 }
1395                 else
1396                 {
1397                     package.log_write(rec_buf, rec_len);
1398                     package.log_write("\r\n", 2);
1399                 }
1400
1401                 if (rec_buf && b->xsp && enable_pz2_transform)
1402                 {
1403                     xmlDoc *rec_doc = xmlParseMemory(rec_buf, rec_len);
1404                     if (!rec_doc)
1405                     {
1406                         const char *addinfo = "xml parse failed for record";
1407                         int error = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
1408                         log_diagnostic(package, error, addinfo);
1409                         npr = zget_surrogateDiagRec(
1410                             odr, odr_database, error, addinfo);
1411                     }
1412                     else
1413                     {
1414                         xmlDoc *rec_res =
1415                             xsltApplyStylesheet(b->xsp, rec_doc, 0);
1416
1417                         if (rec_res)
1418                         {
1419                             xsltSaveResultToString(&xmlrec_buf, &rec_len,
1420                                                    rec_res, b->xsp);
1421                             rec_buf = (const char *) xmlrec_buf;
1422                             package.log("zoom", YLOG_LOG, "xslt successful");
1423                             package.log_write(rec_buf, rec_len);
1424
1425                             xmlFreeDoc(rec_res);
1426                         }
1427                         if (!rec_buf)
1428                         {
1429                             std::string addinfo;
1430                             int error =
1431                                 YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
1432
1433                             addinfo = "xslt apply failed for "
1434                                 + b->sptr->transform_xsl_fname;
1435                             log_diagnostic(package, error, addinfo.c_str());
1436                             npr = zget_surrogateDiagRec(
1437                                 odr, odr_database, error, addinfo.c_str());
1438                         }
1439                         xmlFreeDoc(rec_doc);
1440                     }
1441                 }
1442
1443                 if (rec_buf && b->enable_cproxy)
1444                 {
1445                     xmlDoc *doc = xmlParseMemory(rec_buf, rec_len);
1446                     std::string res =
1447                         mp::xml::url_recipe_handle(doc, b->sptr->urlRecipe);
1448                     if (res.length() && b->content_session_id.length())
1449                     {
1450                         size_t off = res.find_first_of("://");
1451                         if (off != std::string::npos)
1452                         {
1453                             char tmp[1024];
1454                             sprintf(tmp, "%s.%s/",
1455                                     b->content_session_id.c_str(),
1456                                     m_p->content_proxy_server.c_str());
1457                             res.insert(off + 3, tmp);
1458                         }
1459                     }
1460                     if (res.length())
1461                     {
1462                         xmlNode *ptr = xmlDocGetRootElement(doc);
1463                         while (ptr && ptr->type != XML_ELEMENT_NODE)
1464                             ptr = ptr->next;
1465                         xmlNode *c =
1466                             xmlNewChild(ptr, 0, BAD_CAST "metadata", 0);
1467                         xmlNewProp(c, BAD_CAST "type", BAD_CAST
1468                                    "generated-url");
1469                         xmlNode * t = xmlNewText(BAD_CAST res.c_str());
1470                         xmlAddChild(c, t);
1471
1472                         if (xmlrec_buf)
1473                             xmlFree(xmlrec_buf);
1474
1475                         xmlDocDumpMemory(doc, &xmlrec_buf, &rec_len);
1476                         rec_buf = (const char *) xmlrec_buf;
1477                     }
1478                     xmlFreeDoc(doc);
1479                 }
1480                 if (!npr)
1481                 {
1482                     if (!rec_buf)
1483                         npr = zget_surrogateDiagRec(
1484                             odr, odr_database,
1485                             YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1486                             rec_type_str);
1487                     else
1488                     {
1489                         npr = (Z_NamePlusRecord *)
1490                             odr_malloc(odr, sizeof(*npr));
1491                         npr->databaseName = odr_database;
1492                         npr->which = Z_NamePlusRecord_databaseRecord;
1493                         npr->u.databaseRecord =
1494                             z_ext_record_xml(odr, rec_buf, rec_len);
1495                     }
1496                 }
1497                 if (xmlrec_buf)
1498                     xmlFree(xmlrec_buf);
1499             }
1500             else
1501             {
1502                 Z_External *ext =
1503                     (Z_External *) ZOOM_record_get(recs[i], "ext", 0);
1504                 if (ext)
1505                 {
1506                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1507                     npr->databaseName = odr_database;
1508                     npr->which = Z_NamePlusRecord_databaseRecord;
1509                     npr->u.databaseRecord = ext;
1510                 }
1511                 else
1512                 {
1513                     npr = zget_surrogateDiagRec(
1514                         odr, odr_database,
1515                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1516                         "ZOOM_record, type ext");
1517                 }
1518             }
1519             npl->records[i] = npr;
1520         }
1521         records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1522         records->which = Z_Records_DBOSD;
1523         records->u.databaseOrSurDiagnostics = npl;
1524     }
1525     return records;
1526 }
1527
1528 struct cql_node *yf::Zoom::Impl::convert_cql_fields(struct cql_node *cn,
1529                                                     ODR odr)
1530 {
1531     struct cql_node *r = 0;
1532     if (!cn)
1533         return 0;
1534     switch (cn->which)
1535     {
1536     case CQL_NODE_ST:
1537         if (cn->u.st.index)
1538         {
1539             std::map<std::string,std::string>::const_iterator it;
1540             it = fieldmap.find(cn->u.st.index);
1541             if (it == fieldmap.end())
1542                 return cn;
1543             if (it->second.length())
1544                 cn->u.st.index = odr_strdup(odr, it->second.c_str());
1545             else
1546                 cn->u.st.index = 0;
1547         }
1548         break;
1549     case CQL_NODE_BOOL:
1550         r = convert_cql_fields(cn->u.boolean.left, odr);
1551         if (!r)
1552             r = convert_cql_fields(cn->u.boolean.right, odr);
1553         break;
1554     case CQL_NODE_SORT:
1555         r = convert_cql_fields(cn->u.sort.search, odr);
1556         break;
1557     }
1558     return r;
1559 }
1560
1561 void yf::Zoom::Frontend::log_diagnostic(mp::Package &package,
1562                                         int error, const char *addinfo)
1563 {
1564     const char *err_msg = yaz_diag_bib1_str(error);
1565     if (addinfo)
1566         package.log("zoom", YLOG_WARN, "Diagnostic %d %s: %s",
1567                     error, err_msg, addinfo);
1568     else
1569         package.log("zoom", YLOG_WARN, "Diagnostic %d %s:",
1570                     error, err_msg);
1571 }
1572
1573 yf::Zoom::BackendPtr yf::Zoom::Frontend::explain_search(mp::Package &package,
1574                                                         std::string &database,
1575                                                         int *error,
1576                                                         char **addinfo,
1577                                                         mp::odr &odr,
1578                                                         std::string &torus_db,
1579                                                         std::string &realm)
1580 {
1581     m_backend.reset();
1582
1583     BackendPtr b(new Backend);
1584
1585     b->m_frontend_database = database;
1586     b->enable_explain = true;
1587
1588     Z_GDU *gdu = package.request().get();
1589     Z_APDU *apdu_req = gdu->u.z3950;
1590     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1591     Z_Query *query = sr->query;
1592
1593     if (!m_p->explain_xsp)
1594     {
1595         *error = YAZ_BIB1_UNSPECIFIED_ERROR;
1596         *addinfo =
1597             odr_strdup(odr, "IR-Explain---1 unsupported. torus explain_xsl not defined");
1598         return m_backend;
1599     }
1600     else if (query->which == Z_Query_type_104 &&
1601         query->u.type_104->which == Z_External_CQL)
1602     {
1603         std::string torus_url = m_p->torus_searchable_url;
1604         std::string torus_query(query->u.type_104->u.cql);
1605         xmlDoc *doc = mp::get_searchable(package, torus_url, "",
1606                                          torus_query,
1607                                          realm, m_p->proxy);
1608         if (m_p->explain_xsp)
1609         {
1610             xmlDoc *rec_res =  xsltApplyStylesheet(m_p->explain_xsp, doc, 0);
1611
1612             xmlFreeDoc(doc);
1613             doc = rec_res;
1614         }
1615         if (!doc)
1616         {
1617             *error = YAZ_BIB1_UNSPECIFIED_ERROR;
1618             *addinfo = odr_strdup(odr, "IR-Explain--1 problem. "
1619                                   "Could not obtain Torus records for Explain");
1620         }
1621         else
1622         {
1623             xmlNode *ptr = xmlDocGetRootElement(doc);
1624             int hits = 0;
1625
1626             xml_node_search(ptr, &hits, 0);
1627
1628             Z_APDU *apdu_res = odr.create_searchResponse(apdu_req, 0, 0);
1629             apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1630             package.response() = apdu_res;
1631             m_backend = b;
1632         }
1633         if (b->explain_doc)
1634             xmlFreeDoc(b->explain_doc);
1635         b->explain_doc = doc;
1636         return m_backend;
1637     }
1638     else
1639     {
1640         *error = YAZ_BIB1_QUERY_TYPE_UNSUPP;
1641         *addinfo = odr_strdup(odr, "IR-Explain---1 only supports CQL");
1642         return m_backend;
1643     }
1644 }
1645
1646 void yf::Zoom::Frontend::handle_search(mp::Package &package)
1647 {
1648     Z_GDU *gdu = package.request().get();
1649     Z_APDU *apdu_req = gdu->u.z3950;
1650     Z_APDU *apdu_res = 0;
1651     mp::odr odr;
1652     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1653     if (sr->num_databaseNames != 1)
1654     {
1655         int error = YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED;
1656         log_diagnostic(package, error, 0);
1657         apdu_res = odr.create_searchResponse(apdu_req, error, 0);
1658         package.response() = apdu_res;
1659         return;
1660     }
1661     int proxy_step = 0;
1662
1663 next_proxy:
1664
1665     int error = 0;
1666     char *addinfo = 0;
1667     std::string db(sr->databaseNames[0]);
1668
1669     BackendPtr b = get_backend_from_databases(package, db, &error,
1670                                               &addinfo, odr, &proxy_step);
1671     if (error && proxy_step)
1672     {
1673         package.log("zoom", YLOG_WARN,
1674                     "create backend failed: trying next proxy");
1675         goto next_proxy;
1676     }
1677     if (error)
1678     {
1679         log_diagnostic(package, error, addinfo);
1680         apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1681         package.response() = apdu_res;
1682         return;
1683     }
1684     if (!b || b->enable_explain)
1685         return;
1686
1687     b->set_option("setname", "default");
1688
1689     bool enable_pz2_retrieval = false;
1690     bool enable_pz2_transform = false;
1691     bool assume_marc8_charset = false;
1692     prepare_elements(b, sr->preferredRecordSyntax, 0 /*element_set_name */,
1693                      enable_pz2_retrieval,
1694                      enable_pz2_transform,
1695                      assume_marc8_charset);
1696
1697     Odr_int hits = 0;
1698     Z_Query *query = sr->query;
1699     WRBUF ccl_wrbuf = 0;
1700     WRBUF pqf_wrbuf = 0;
1701     std::string sortkeys;
1702
1703     if (query->which == Z_Query_type_1 || query->which == Z_Query_type_101)
1704     {
1705         // RPN
1706         pqf_wrbuf = wrbuf_alloc();
1707         yaz_rpnquery_to_wrbuf(pqf_wrbuf, query->u.type_1);
1708     }
1709     else if (query->which == Z_Query_type_2)
1710     {
1711         // CCL
1712         ccl_wrbuf = wrbuf_alloc();
1713         wrbuf_write(ccl_wrbuf, (const char *) query->u.type_2->buf,
1714                     query->u.type_2->len);
1715     }
1716     else if (query->which == Z_Query_type_104 &&
1717              query->u.type_104->which == Z_External_CQL)
1718     {
1719         // CQL
1720         const char *cql = query->u.type_104->u.cql;
1721         CQL_parser cp = cql_parser_create();
1722         int r = cql_parser_string(cp, cql);
1723         package.log("zoom", YLOG_LOG, "CQL: %s", cql);
1724         if (r)
1725         {
1726             cql_parser_destroy(cp);
1727             error = YAZ_BIB1_MALFORMED_QUERY;
1728             const char *addinfo = "CQL syntax error";
1729             log_diagnostic(package, error, addinfo);
1730             apdu_res =
1731                 odr.create_searchResponse(apdu_req, error, addinfo);
1732             package.response() = apdu_res;
1733             return;
1734         }
1735         struct cql_node *cn = cql_parser_result(cp);
1736         struct cql_node *cn_error = m_p->convert_cql_fields(cn, odr);
1737         if (cn_error)
1738         {
1739             // hopefully we are getting a ptr to a index+relation+term node
1740             error = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1741             addinfo = 0;
1742             if (cn_error->which == CQL_NODE_ST)
1743                 addinfo = cn_error->u.st.index;
1744
1745             log_diagnostic(package, error, addinfo);
1746             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1747             package.response() = apdu_res;
1748             cql_parser_destroy(cp);
1749             return;
1750         }
1751         char ccl_buf[1024];
1752         r = cql_to_ccl_buf(cn, ccl_buf, sizeof(ccl_buf));
1753         if (r)
1754         {
1755             error = YAZ_BIB1_MALFORMED_QUERY;
1756             const char *addinfo = "CQL to CCL conversion error";
1757
1758             log_diagnostic(package, error, addinfo);
1759             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1760             package.response() = apdu_res;
1761             cql_parser_destroy(cp);
1762             return;
1763         }
1764
1765         WRBUF sru_sortkeys_wrbuf = wrbuf_alloc();
1766         if (cql_sortby_to_sortkeys(cn, wrbuf_vp_puts, sru_sortkeys_wrbuf))
1767         {
1768             error = YAZ_BIB1_ILLEGAL_SORT_RELATION;
1769             const char *addinfo = "CQL to CCL sortby conversion";
1770
1771             log_diagnostic(package, error, addinfo);
1772             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1773             package.response() = apdu_res;
1774             wrbuf_destroy(sru_sortkeys_wrbuf);
1775             cql_parser_destroy(cp);
1776             return;
1777         }
1778         WRBUF sort_spec_wrbuf = wrbuf_alloc();
1779         yaz_srw_sortkeys_to_sort_spec(wrbuf_cstr(sru_sortkeys_wrbuf),
1780                                       sort_spec_wrbuf);
1781         wrbuf_destroy(sru_sortkeys_wrbuf);
1782
1783         ccl_wrbuf = wrbuf_alloc();
1784         wrbuf_puts(ccl_wrbuf, ccl_buf);
1785
1786         yaz_tok_cfg_t tc = yaz_tok_cfg_create();
1787         yaz_tok_parse_t tp =
1788             yaz_tok_parse_buf(tc, wrbuf_cstr(sort_spec_wrbuf));
1789         yaz_tok_cfg_destroy(tc);
1790
1791         /* go through sortspec and map fields */
1792         int token = yaz_tok_move(tp);
1793         while (token != YAZ_TOK_EOF)
1794         {
1795             if (token == YAZ_TOK_STRING)
1796             {
1797                 const char *field = yaz_tok_parse_string(tp);
1798                 std::map<std::string,std::string>::iterator it;
1799                 it = b->sptr->sortmap.find(field);
1800                 if (it != b->sptr->sortmap.end())
1801                     sortkeys += it->second;
1802                 else
1803                     sortkeys += field;
1804             }
1805             sortkeys += " ";
1806             token = yaz_tok_move(tp);
1807             if (token == YAZ_TOK_STRING)
1808             {
1809                 sortkeys += yaz_tok_parse_string(tp);
1810             }
1811             if (token != YAZ_TOK_EOF)
1812             {
1813                 sortkeys += " ";
1814                 token = yaz_tok_move(tp);
1815             }
1816         }
1817         yaz_tok_parse_destroy(tp);
1818         wrbuf_destroy(sort_spec_wrbuf);
1819
1820         cql_parser_destroy(cp);
1821     }
1822     else
1823     {
1824         error = YAZ_BIB1_QUERY_TYPE_UNSUPP;
1825         const char *addinfo = 0;
1826         log_diagnostic(package, error, addinfo);
1827         apdu_res =  odr.create_searchResponse(apdu_req, error, addinfo);
1828         package.response() = apdu_res;
1829         return;
1830     }
1831
1832     if (ccl_wrbuf)
1833     {
1834         // CCL to PQF
1835         assert(pqf_wrbuf == 0);
1836         int cerror, cpos;
1837         struct ccl_rpn_node *cn;
1838         package.log("zoom", YLOG_LOG, "CCL: %s", wrbuf_cstr(ccl_wrbuf));
1839         cn = ccl_find_str(b->sptr->ccl_bibset, wrbuf_cstr(ccl_wrbuf),
1840                           &cerror, &cpos);
1841         wrbuf_destroy(ccl_wrbuf);
1842         if (!cn)
1843         {
1844             char *addinfo = odr_strdup(odr, ccl_err_msg(cerror));
1845             error = YAZ_BIB1_MALFORMED_QUERY;
1846
1847             switch (cerror)
1848             {
1849             case CCL_ERR_UNKNOWN_QUAL:
1850                 error = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1851                 break;
1852             case CCL_ERR_TRUNC_NOT_LEFT:
1853             case CCL_ERR_TRUNC_NOT_RIGHT:
1854             case CCL_ERR_TRUNC_NOT_BOTH:
1855                 error = YAZ_BIB1_UNSUPP_TRUNCATION_ATTRIBUTE;
1856                 break;
1857             }
1858             log_diagnostic(package, error, addinfo);
1859             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1860             package.response() = apdu_res;
1861             return;
1862         }
1863         pqf_wrbuf = wrbuf_alloc();
1864         ccl_pquery(pqf_wrbuf, cn);
1865         package.log("zoom", YLOG_LOG, "RPN: %s", wrbuf_cstr(pqf_wrbuf));
1866         ccl_rpn_delete(cn);
1867     }
1868
1869     assert(pqf_wrbuf);
1870
1871     ZOOM_query q = ZOOM_query_create();
1872     ZOOM_query_sortby2(q, b->sptr->sortStrategy.c_str(), sortkeys.c_str());
1873
1874     if (b->get_option("sru"))
1875     {
1876         int status = 0;
1877         Z_RPNQuery *zquery;
1878         zquery = p_query_rpn(odr, wrbuf_cstr(pqf_wrbuf));
1879         WRBUF wrb = wrbuf_alloc();
1880
1881         if (!strcmp(b->get_option("sru"), "solr"))
1882         {
1883             solr_transform_t cqlt = solr_transform_create();
1884
1885             status = solr_transform_rpn2solr_wrbuf(cqlt, wrb, zquery);
1886
1887             solr_transform_close(cqlt);
1888         }
1889         else
1890         {
1891             cql_transform_t cqlt = cql_transform_create();
1892
1893             status = cql_transform_rpn2cql_wrbuf(cqlt, wrb, zquery);
1894
1895             cql_transform_close(cqlt);
1896         }
1897         if (status == 0)
1898         {
1899             ZOOM_query_cql(q, wrbuf_cstr(wrb));
1900             package.log("zoom", YLOG_LOG, "CQL: %s", wrbuf_cstr(wrb));
1901             b->search(q, &hits, &error, &addinfo, odr);
1902         }
1903         ZOOM_query_destroy(q);
1904
1905         wrbuf_destroy(wrb);
1906         wrbuf_destroy(pqf_wrbuf);
1907         if (status)
1908         {
1909             error = YAZ_BIB1_MALFORMED_QUERY;
1910             const char *addinfo = "can not convert from RPN to CQL/SOLR";
1911             log_diagnostic(package, error, addinfo);
1912             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1913             package.response() = apdu_res;
1914             return;
1915         }
1916     }
1917     else
1918     {
1919         ZOOM_query_prefix(q, wrbuf_cstr(pqf_wrbuf));
1920         package.log("zoom", YLOG_LOG, "search PQF: %s", wrbuf_cstr(pqf_wrbuf));
1921         b->search(q, &hits, &error, &addinfo, odr);
1922         ZOOM_query_destroy(q);
1923         wrbuf_destroy(pqf_wrbuf);
1924     }
1925
1926     if (error && proxy_step)
1927     {
1928         // reset below prevent reuse in get_backend_from_databases
1929         m_backend.reset();
1930         package.log("zoom", YLOG_WARN, "search failed: trying next proxy");
1931         goto next_proxy;
1932     }
1933
1934     const char *element_set_name = 0;
1935     Odr_int number_to_present = 0;
1936     if (!error)
1937         mp::util::piggyback_sr(sr, hits, number_to_present, &element_set_name);
1938
1939     Odr_int number_of_records_returned = 0;
1940     Z_Records *records = get_records(
1941         package,
1942         0, number_to_present, &error, &addinfo,
1943         &number_of_records_returned, odr, b, sr->preferredRecordSyntax,
1944         element_set_name);
1945     if (error)
1946         log_diagnostic(package, error, addinfo);
1947     apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1948     if (records)
1949     {
1950         apdu_res->u.searchResponse->records = records;
1951         apdu_res->u.searchResponse->numberOfRecordsReturned =
1952             odr_intdup(odr, number_of_records_returned);
1953     }
1954     apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1955     package.response() = apdu_res;
1956 }
1957
1958 void yf::Zoom::Frontend::handle_present(mp::Package &package)
1959 {
1960     Z_GDU *gdu = package.request().get();
1961     Z_APDU *apdu_req = gdu->u.z3950;
1962     Z_APDU *apdu_res = 0;
1963     Z_PresentRequest *pr = apdu_req->u.presentRequest;
1964
1965     mp::odr odr;
1966     if (!m_backend)
1967     {
1968         package.response() = odr.create_presentResponse(
1969             apdu_req, YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST, 0);
1970         return;
1971     }
1972     const char *element_set_name = 0;
1973     Z_RecordComposition *comp = pr->recordComposition;
1974     if (comp && comp->which != Z_RecordComp_simple)
1975     {
1976         package.response() = odr.create_presentResponse(
1977             apdu_req,
1978             YAZ_BIB1_PRESENT_COMP_SPEC_PARAMETER_UNSUPP, 0);
1979         return;
1980     }
1981     if (comp && comp->u.simple->which == Z_ElementSetNames_generic)
1982         element_set_name = comp->u.simple->u.generic;
1983     Odr_int number_of_records_returned = 0;
1984     int error = 0;
1985     char *addinfo = 0;
1986
1987     if (m_backend->enable_explain)
1988     {
1989         Z_Records *records =
1990             get_explain_records(
1991                 package,
1992                 *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
1993                 &error, &addinfo, &number_of_records_returned, odr, m_backend,
1994                 pr->preferredRecordSyntax, element_set_name);
1995
1996         apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
1997         if (records)
1998         {
1999             apdu_res->u.presentResponse->records = records;
2000             apdu_res->u.presentResponse->numberOfRecordsReturned =
2001                 odr_intdup(odr, number_of_records_returned);
2002         }
2003         package.response() = apdu_res;
2004     }
2005     else
2006     {
2007         Z_Records *records =
2008             get_records(package,
2009                         *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
2010                         &error, &addinfo, &number_of_records_returned, odr, m_backend,
2011                         pr->preferredRecordSyntax, element_set_name);
2012
2013         apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
2014         if (records)
2015         {
2016             apdu_res->u.presentResponse->records = records;
2017             apdu_res->u.presentResponse->numberOfRecordsReturned =
2018                 odr_intdup(odr, number_of_records_returned);
2019         }
2020         package.response() = apdu_res;
2021     }
2022 }
2023
2024 void yf::Zoom::Frontend::handle_package(mp::Package &package)
2025 {
2026     Z_GDU *gdu = package.request().get();
2027     if (!gdu)
2028         ;
2029     else if (gdu->which == Z_GDU_Z3950)
2030     {
2031         Z_APDU *apdu_req = gdu->u.z3950;
2032
2033         if (m_backend)
2034             wrbuf_rewind(m_backend->m_apdu_wrbuf);
2035         if (apdu_req->which == Z_APDU_initRequest)
2036         {
2037             mp::odr odr;
2038             package.response() = odr.create_close(
2039                 apdu_req,
2040                 Z_Close_protocolError,
2041                 "double init");
2042         }
2043         else if (apdu_req->which == Z_APDU_searchRequest)
2044         {
2045             handle_search(package);
2046         }
2047         else if (apdu_req->which == Z_APDU_presentRequest)
2048         {
2049             handle_present(package);
2050         }
2051         else
2052         {
2053             mp::odr odr;
2054             package.response() = odr.create_close(
2055                 apdu_req,
2056                 Z_Close_protocolError,
2057                 "zoom filter cannot handle this APDU");
2058             package.session().close();
2059         }
2060         if (m_backend)
2061         {
2062             WRBUF w = m_backend->m_apdu_wrbuf;
2063             package.log_write(wrbuf_buf(w), wrbuf_len(w));
2064         }
2065     }
2066     else
2067     {
2068         package.session().close();
2069     }
2070 }
2071
2072 void yf::Zoom::Impl::process(mp::Package &package)
2073 {
2074     FrontendPtr f = get_frontend(package);
2075     Z_GDU *gdu = package.request().get();
2076
2077     if (f->m_is_virtual)
2078     {
2079         f->handle_package(package);
2080     }
2081     else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
2082              Z_APDU_initRequest)
2083     {
2084         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
2085         f->m_init_gdu = gdu;
2086
2087         mp::odr odr;
2088         Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
2089         Z_InitResponse *resp = apdu->u.initResponse;
2090
2091         int i;
2092         static const int masks[] = {
2093             Z_Options_search,
2094             Z_Options_present,
2095             -1
2096         };
2097         for (i = 0; masks[i] != -1; i++)
2098             if (ODR_MASK_GET(req->options, masks[i]))
2099                 ODR_MASK_SET(resp->options, masks[i]);
2100
2101         static const int versions[] = {
2102             Z_ProtocolVersion_1,
2103             Z_ProtocolVersion_2,
2104             Z_ProtocolVersion_3,
2105             -1
2106         };
2107         for (i = 0; versions[i] != -1; i++)
2108             if (ODR_MASK_GET(req->protocolVersion, versions[i]))
2109                 ODR_MASK_SET(resp->protocolVersion, versions[i]);
2110             else
2111                 break;
2112
2113         *resp->preferredMessageSize = *req->preferredMessageSize;
2114         *resp->maximumRecordSize = *req->maximumRecordSize;
2115
2116         package.response() = apdu;
2117         f->m_is_virtual = true;
2118     }
2119     else
2120         package.move();
2121
2122     release_frontend(package);
2123 }
2124
2125
2126 static mp::filter::Base* filter_creator()
2127 {
2128     return new mp::filter::Zoom;
2129 }
2130
2131 extern "C" {
2132     struct metaproxy_1_filter_struct metaproxy_1_filter_zoom = {
2133         0,
2134         "zoom",
2135         filter_creator
2136     };
2137 }
2138
2139
2140 /*
2141  * Local variables:
2142  * c-basic-offset: 4
2143  * c-file-style: "Stroustrup"
2144  * indent-tabs-mode: nil
2145  * End:
2146  * vim: shiftwidth=4 tabstop=8 expandtab
2147  */
2148