src/filter_zoom.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2011 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 #include "filter_zoom.hpp"
  21 #include <yaz/zoom.h>
  22 #include <yaz/yaz-version.h>
  23 #include <yaz/tpath.h>
  24 #include <yaz/srw.h>
  25 #include <metaproxy/package.hpp>
  26 #include <metaproxy/util.hpp>
  27 #include <metaproxy/xmlutil.hpp>
  28 #include "torus.hpp"
  29
  30 #include <libxslt/xsltutils.h>
  31 #include <libxslt/transform.h>
  32
  33 #include <boost/thread/mutex.hpp>
  34 #include <boost/thread/condition.hpp>
  35 #include <yaz/ccl_xml.h>
  36 #include <yaz/ccl.h>
  37 #include <yaz/rpn2cql.h>
  38 #include <yaz/rpn2solr.h>
  39 #include <yaz/pquery.h>
  40 #include <yaz/cql.h>
  41 #include <yaz/oid_db.h>
  42 #include <yaz/diagbib1.h>
  43 #include <yaz/log.h>
  44 #include <yaz/zgdu.h>
  45 #include <yaz/querytowrbuf.h>
  46
  47 namespace mp = metaproxy_1;
  48 namespace yf = mp::filter;
  49
  50 namespace metaproxy_1 {
  51     namespace filter {
  52         struct Zoom::Searchable : boost::noncopyable {
  53             std::string authentication;
  54             std::string cfAuth;
  55             std::string cfProxy;
  56             std::string cfSubDb;
  57             std::string udb;
  58             std::string target;
  59             std::string query_encoding;
  60             std::string sru;
  61             std::string request_syntax;
  62             std::string element_set;
  63             std::string record_encoding;
  64             std::string transform_xsl_fname;
  65             std::string urlRecipe;
  66             std::string contentConnector;
  67             bool use_turbomarc;
  68             bool piggyback;
  69             CCL_bibset ccl_bibset;
  70             Searchable(CCL_bibset base);
  71             ~Searchable();
  72         };
  73         class Zoom::Backend : boost::noncopyable {
  74             friend class Impl;
  75             friend class Frontend;
  76             std::string zurl;
  77             ZOOM_connection m_connection;
  78             ZOOM_resultset m_resultset;
  79             std::string m_frontend_database;
  80             SearchablePtr sptr;
  81             xsltStylesheetPtr xsp;
  82         public:
  83             Backend(SearchablePtr sptr);
  84             ~Backend();
  85             void connect(std::string zurl, int *error, char **addinfo,
  86                          ODR odr);
  87             void search_pqf(const char *pqf, Odr_int *hits,
  88                             int *error, char **addinfo, ODR odr);
  89             void search_cql(const char *cql, Odr_int *hits,
  90                             int *error, char **addinfo, ODR odr);
  91             void present(Odr_int start, Odr_int number, ZOOM_record *recs,
  92                          int *error, char **addinfo, ODR odr);
  93             void set_option(const char *name, const char *value);
  94             const char *get_option(const char *name);
  95             void get_zoom_error(int *error, char **addinfo, ODR odr);
  96         };
  97         class Zoom::Frontend : boost::noncopyable {
  98             friend class Impl;
  99             Impl *m_p;
 100             bool m_is_virtual;
 101             bool m_in_use;
 102             yazpp_1::GDU m_init_gdu;
 103             BackendPtr m_backend;
 104             void handle_package(mp::Package &package);
 105             void handle_search(mp::Package &package);
 106             void handle_present(mp::Package &package);
 107             BackendPtr get_backend_from_databases(std::string &database,
 108                                                   int *error,
 109                                                   char **addinfo,
 110                                                   ODR odr);
 111             Z_Records *get_records(Odr_int start,
 112                                    Odr_int number_to_present,
 113                                    int *error,
 114                                    char **addinfo,
 115                                    Odr_int *number_of_records_returned,
 116                                    ODR odr, BackendPtr b,
 117                                    Odr_oid *preferredRecordSyntax,
 118                                    const char *element_set_name);
 119         public:
 120             Frontend(Impl *impl);
 121             ~Frontend();
 122         };
 123         class Zoom::Impl {
 124             friend class Frontend;
 125         public:
 126             Impl();
 127             ~Impl();
 128             void process(metaproxy_1::Package & package);
 129             void configure(const xmlNode * ptr, bool test_only,
 130                            const char *path);
 131         private:
 132             void configure_local_records(const xmlNode * ptr, bool test_only);
 133             FrontendPtr get_frontend(mp::Package &package);
 134             void release_frontend(mp::Package &package);
 135             SearchablePtr parse_torus_record(const xmlNode *ptr);
 136             struct cql_node *convert_cql_fields(struct cql_node *cn, ODR odr);
 137             std::map<mp::Session, FrontendPtr> m_clients;
 138             boost::mutex m_mutex;
 139             boost::condition m_cond_session_ready;
 140             std::string torus_url;
 141             std::map<std::string,std::string> fieldmap;
 142             std::string xsldir;
 143             std::string file_path;
 144             std::string content_proxy_server;
 145             CCL_bibset bibset;
 146             std::string element_transform;
 147             std::string element_raw;
 148             std::map<std::string,SearchablePtr> s_map;
 149         };
 150     }
 151 }
 152
 153 // define Pimpl wrapper forwarding to Impl
 154
 155 yf::Zoom::Zoom() : m_p(new Impl)
 156 {
 157 }
 158
 159 yf::Zoom::~Zoom()
 160 {  // must have a destructor because of boost::scoped_ptr
 161 }
 162
 163 void yf::Zoom::configure(const xmlNode *xmlnode, bool test_only,
 164                          const char *path)
 165 {
 166     m_p->configure(xmlnode, test_only, path);
 167 }
 168
 169 void yf::Zoom::process(mp::Package &package) const
 170 {
 171     m_p->process(package);
 172 }
 173
 174
 175 // define Implementation stuff
 176
 177 yf::Zoom::Backend::Backend(SearchablePtr ptr) : sptr(ptr)
 178 {
 179     m_connection = ZOOM_connection_create(0);
 180     m_resultset = 0;
 181     xsp = 0;
 182 }
 183
 184 yf::Zoom::Backend::~Backend()
 185 {
 186     if (xsp)
 187         xsltFreeStylesheet(xsp);
 188     ZOOM_connection_destroy(m_connection);
 189     ZOOM_resultset_destroy(m_resultset);
 190 }
 191
 192
 193 void yf::Zoom::Backend::get_zoom_error(int *error, char **addinfo,
 194                                        ODR odr)
 195 {
 196     const char *msg = 0;
 197     const char *zoom_addinfo = 0;
 198     *error = ZOOM_connection_error(m_connection, &msg, &zoom_addinfo);
 199     if (*error)
 200     {
 201         if (*error >= ZOOM_ERROR_CONNECT)
 202         {
 203             // turn ZOOM diagnostic into a Bib-1 2: with addinfo=zoom err msg
 204             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 205             *addinfo = (char *) odr_malloc(
 206                 odr, 20 + strlen(msg) +
 207                 (zoom_addinfo ? strlen(zoom_addinfo) : 0));
 208             strcpy(*addinfo, msg);
 209             if (zoom_addinfo)
 210             {
 211                 strcat(*addinfo, ": ");
 212                 strcat(*addinfo, zoom_addinfo);
 213                 strcat(*addinfo, " ");
 214             }
 215         }
 216         else
 217         {
 218             *addinfo = (char *) odr_malloc(
 219                 odr, 20 + (zoom_addinfo ? strlen(zoom_addinfo) : 0));
 220             **addinfo = '\0';
 221             if (zoom_addinfo && *zoom_addinfo)
 222             {
 223                 strcpy(*addinfo, zoom_addinfo);
 224                 strcat(*addinfo, " ");
 225             }
 226             strcat(*addinfo, "(backend)");
 227         }
 228     }
 229 }
 230
 231 void yf::Zoom::Backend::connect(std::string zurl,
 232                                 int *error, char **addinfo,
 233                                 ODR odr)
 234 {
 235     ZOOM_connection_connect(m_connection, zurl.c_str(), 0);
 236     get_zoom_error(error, addinfo, odr);
 237 }
 238
 239 void yf::Zoom::Backend::search_pqf(const char *pqf, Odr_int *hits,
 240                                    int *error, char **addinfo, ODR odr)
 241 {
 242     m_resultset = ZOOM_connection_search_pqf(m_connection, pqf);
 243     get_zoom_error(error, addinfo, odr);
 244     if (*error == 0)
 245         *hits = ZOOM_resultset_size(m_resultset);
 246     else
 247         *hits = 0;
 248 }
 249
 250 void yf::Zoom::Backend::search_cql(const char *cql, Odr_int *hits,
 251                                    int *error, char **addinfo, ODR odr)
 252 {
 253     ZOOM_query q = ZOOM_query_create();
 254
 255     ZOOM_query_cql(q, cql);
 256
 257     m_resultset = ZOOM_connection_search(m_connection, q);
 258     ZOOM_query_destroy(q);
 259     get_zoom_error(error, addinfo, odr);
 260     if (*error == 0)
 261         *hits = ZOOM_resultset_size(m_resultset);
 262     else
 263         *hits = 0;
 264 }
 265
 266 void yf::Zoom::Backend::present(Odr_int start, Odr_int number,
 267                                 ZOOM_record *recs,
 268                                 int *error, char **addinfo, ODR odr)
 269 {
 270     ZOOM_resultset_records(m_resultset, recs, start, number);
 271     get_zoom_error(error, addinfo, odr);
 272 }
 273
 274 void yf::Zoom::Backend::set_option(const char *name, const char *value)
 275 {
 276     ZOOM_connection_option_set(m_connection, name, value);
 277     if (m_resultset)
 278         ZOOM_resultset_option_set(m_resultset, name, value);
 279 }
 280
 281 const char *yf::Zoom::Backend::get_option(const char *name)
 282 {
 283     return ZOOM_connection_option_get(m_connection, name);
 284 }
 285
 286 yf::Zoom::Searchable::Searchable(CCL_bibset base)
 287 {
 288     piggyback = true;
 289     use_turbomarc = true;
 290     ccl_bibset = ccl_qual_dup(base);
 291 }
 292
 293 yf::Zoom::Searchable::~Searchable()
 294 {
 295     ccl_qual_rm(&ccl_bibset);
 296 }
 297
 298 yf::Zoom::Frontend::Frontend(Impl *impl) :
 299     m_p(impl), m_is_virtual(false), m_in_use(true)
 300 {
 301 }
 302
 303 yf::Zoom::Frontend::~Frontend()
 304 {
 305 }
 306
 307 yf::Zoom::FrontendPtr yf::Zoom::Impl::get_frontend(mp::Package &package)
 308 {
 309     boost::mutex::scoped_lock lock(m_mutex);
 310
 311     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 312
 313     while(true)
 314     {
 315         it = m_clients.find(package.session());
 316         if (it == m_clients.end())
 317             break;
 318
 319         if (!it->second->m_in_use)
 320         {
 321             it->second->m_in_use = true;
 322             return it->second;
 323         }
 324         m_cond_session_ready.wait(lock);
 325     }
 326     FrontendPtr f(new Frontend(this));
 327     m_clients[package.session()] = f;
 328     f->m_in_use = true;
 329     return f;
 330 }
 331
 332 void yf::Zoom::Impl::release_frontend(mp::Package &package)
 333 {
 334     boost::mutex::scoped_lock lock(m_mutex);
 335     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 336
 337     it = m_clients.find(package.session());
 338     if (it != m_clients.end())
 339     {
 340         if (package.session().is_closed())
 341         {
 342             m_clients.erase(it);
 343         }
 344         else
 345         {
 346             it->second->m_in_use = false;
 347         }
 348         m_cond_session_ready.notify_all();
 349     }
 350 }
 351
 352 yf::Zoom::Impl::Impl() : element_transform("pz2") , element_raw("raw")
 353 {
 354     bibset = ccl_qual_mk();
 355 }
 356
 357 yf::Zoom::Impl::~Impl()
 358 {
 359     ccl_qual_rm(&bibset);
 360 }
 361
 362 yf::Zoom::SearchablePtr yf::Zoom::Impl::parse_torus_record(const xmlNode *ptr)
 363 {
 364     Zoom::SearchablePtr s(new Searchable(bibset));
 365
 366     for (ptr = ptr->children; ptr; ptr = ptr->next)
 367     {
 368         if (ptr->type != XML_ELEMENT_NODE)
 369             continue;
 370         if (!strcmp((const char *) ptr->name, "layer"))
 371             ptr = ptr->children;
 372         else if (!strcmp((const char *) ptr->name,
 373                          "authentication"))
 374         {
 375             s->authentication = mp::xml::get_text(ptr);
 376         }
 377         else if (!strcmp((const char *) ptr->name,
 378                          "cfAuth"))
 379         {
 380             s->cfAuth = mp::xml::get_text(ptr);
 381         }
 382         else if (!strcmp((const char *) ptr->name,
 383                          "cfProxy"))
 384         {
 385             s->cfProxy = mp::xml::get_text(ptr);
 386         }
 387         else if (!strcmp((const char *) ptr->name,
 388                          "cfSubDb"))
 389         {
 390             s->cfSubDb = mp::xml::get_text(ptr);
 391         }
 392         else if (!strcmp((const char *) ptr->name,
 393                          "contentConnector"))
 394         {
 395             s->contentConnector = mp::xml::get_text(ptr);
 396         }
 397         else if (!strcmp((const char *) ptr->name, "udb"))
 398         {
 399             s->udb = mp::xml::get_text(ptr);
 400         }
 401         else if (!strcmp((const char *) ptr->name, "zurl"))
 402         {
 403             s->target = mp::xml::get_text(ptr);
 404         }
 405         else if (!strcmp((const char *) ptr->name, "sru"))
 406         {
 407             s->sru = mp::xml::get_text(ptr);
 408         }
 409         else if (!strcmp((const char *) ptr->name,
 410                          "queryEncoding"))
 411         {
 412             s->query_encoding = mp::xml::get_text(ptr);
 413         }
 414         else if (!strcmp((const char *) ptr->name,
 415                          "piggyback"))
 416         {
 417             s->piggyback = mp::xml::get_bool(ptr, true);
 418         }
 419         else if (!strcmp((const char *) ptr->name,
 420                          "requestSyntax"))
 421         {
 422             s->request_syntax = mp::xml::get_text(ptr);
 423         }
 424         else if (!strcmp((const char *) ptr->name,
 425                          "elementSet"))
 426         {
 427             s->element_set = mp::xml::get_text(ptr);
 428         }
 429         else if (!strcmp((const char *) ptr->name,
 430                          "recordEncoding"))
 431         {
 432             s->record_encoding = mp::xml::get_text(ptr);
 433         }
 434         else if (!strcmp((const char *) ptr->name,
 435                          "transform"))
 436         {
 437             s->transform_xsl_fname = mp::xml::get_text(ptr);
 438         }
 439         else if (!strcmp((const char *) ptr->name,
 440                          "urlRecipe"))
 441         {
 442             s->urlRecipe = mp::xml::get_text(ptr);
 443         }
 444         else if (!strcmp((const char *) ptr->name,
 445                          "useTurboMarc"))
 446         {
 447             ; // useTurboMarc is ignored
 448         }
 449         else if (!strncmp((const char *) ptr->name,
 450                           "cclmap_", 7))
 451         {
 452             std::string value = mp::xml::get_text(ptr);
 453             ccl_qual_fitem(s->ccl_bibset, value.c_str(),
 454                            (const char *) ptr->name + 7);
 455         }
 456     }
 457     return s;
 458 }
 459
 460 void yf::Zoom::Impl::configure_local_records(const xmlNode *ptr, bool test_only)
 461 {
 462     while (ptr && ptr->type != XML_ELEMENT_NODE)
 463         ptr = ptr->next;
 464
 465     if (ptr)
 466     {
 467         if (!strcmp((const char *) ptr->name, "records"))
 468         {
 469             for (ptr = ptr->children; ptr; ptr = ptr->next)
 470             {
 471                 if (ptr->type != XML_ELEMENT_NODE)
 472                     continue;
 473                 if (!strcmp((const char *) ptr->name, "record"))
 474                 {
 475                     SearchablePtr s = parse_torus_record(ptr);
 476                     if (s)
 477                     {
 478                         std::string udb = s->udb;
 479                         if (udb.length())
 480                             s_map[s->udb] = s;
 481                         else
 482                         {
 483                             throw mp::filter::FilterException
 484                                 ("No udb for local torus record");
 485                         }
 486                     }
 487                 }
 488                 else
 489                 {
 490                     throw mp::filter::FilterException
 491                         ("Bad element "
 492                          + std::string((const char *) ptr->name)
 493                          + " in zoom filter inside element "
 494                          "<torus><records>");
 495                 }
 496             }
 497         }
 498         else
 499         {
 500             throw mp::filter::FilterException
 501                 ("Bad element "
 502                  + std::string((const char *) ptr->name)
 503                  + " in zoom filter inside element <torus>");
 504         }
 505     }
 506 }
 507
 508 void yf::Zoom::Impl::configure(const xmlNode *ptr, bool test_only,
 509                                const char *path)
 510 {
 511     if (path && *path)
 512     {
 513         file_path = path;
 514     }
 515     for (ptr = ptr->children; ptr; ptr = ptr->next)
 516     {
 517         if (ptr->type != XML_ELEMENT_NODE)
 518             continue;
 519         else if (!strcmp((const char *) ptr->name, "torus"))
 520         {
 521             const struct _xmlAttr *attr;
 522             for (attr = ptr->properties; attr; attr = attr->next)
 523             {
 524                 if (!strcmp((const char *) attr->name, "url"))
 525                     torus_url = mp::xml::get_text(attr->children);
 526                 else if (!strcmp((const char *) attr->name, "xsldir"))
 527                     xsldir = mp::xml::get_text(attr->children);
 528                 else if (!strcmp((const char *) attr->name, "element_transform"))
 529                     element_transform = mp::xml::get_text(attr->children);
 530                 else if (!strcmp((const char *) attr->name, "element_raw"))
 531                     element_raw = mp::xml::get_text(attr->children);
 532                 else
 533                     throw mp::filter::FilterException(
 534                         "Bad attribute " + std::string((const char *)
 535                                                        attr->name));
 536             }
 537             configure_local_records(ptr->children, test_only);
 538         }
 539         else if (!strcmp((const char *) ptr->name, "cclmap"))
 540         {
 541             const char *addinfo = 0;
 542             ccl_xml_config(bibset, ptr, &addinfo);
 543         }
 544         else if (!strcmp((const char *) ptr->name, "fieldmap"))
 545         {
 546             const struct _xmlAttr *attr;
 547             std::string ccl_field;
 548             std::string cql_field;
 549             for (attr = ptr->properties; attr; attr = attr->next)
 550             {
 551                 if (!strcmp((const char *) attr->name, "ccl"))
 552                     ccl_field = mp::xml::get_text(attr->children);
 553                 else if (!strcmp((const char *) attr->name, "cql"))
 554                     cql_field = mp::xml::get_text(attr->children);
 555                 else
 556                     throw mp::filter::FilterException(
 557                         "Bad attribute " + std::string((const char *)
 558                                                        attr->name));
 559             }
 560             if (cql_field.length())
 561                 fieldmap[cql_field] = ccl_field;
 562         }
 563         else if (!strcmp((const char *) ptr->name, "contentProxy"))
 564         {
 565             const struct _xmlAttr *attr;
 566             for (attr = ptr->properties; attr; attr = attr->next)
 567             {
 568                 if (!strcmp((const char *) attr->name, "server"))
 569                     content_proxy_server = mp::xml::get_text(attr->children);
 570                 else
 571                     throw mp::filter::FilterException(
 572                         "Bad attribute " + std::string((const char *)
 573                                                        attr->name));
 574             }
 575         }
 576         else
 577         {
 578             throw mp::filter::FilterException
 579                 ("Bad element "
 580                  + std::string((const char *) ptr->name)
 581                  + " in zoom filter");
 582         }
 583     }
 584 }
 585
 586 yf::Zoom::BackendPtr yf::Zoom::Frontend::get_backend_from_databases(
 587     std::string &database, int *error, char **addinfo, ODR odr)
 588 {
 589     std::list<BackendPtr>::const_iterator map_it;
 590     if (m_backend && m_backend->m_frontend_database == database)
 591         return m_backend;
 592
 593     const char *sru_proxy = 0;
 594     std::string db_args;
 595     std::string torus_db;
 596     size_t db_arg_pos = database.find(',');
 597     if (db_arg_pos != std::string::npos)
 598     {
 599         torus_db = database.substr(0, db_arg_pos);
 600         db_args = database.substr(db_arg_pos + 1);
 601     }
 602     else
 603         torus_db = database;
 604
 605     SearchablePtr sptr;
 606
 607     std::map<std::string,SearchablePtr>::iterator it;
 608     it = m_p->s_map.find(torus_db);
 609     if (it != m_p->s_map.end())
 610         sptr = it->second;
 611     else
 612     {
 613         xmlDoc *doc = mp::get_searchable(m_p->torus_url, torus_db);
 614         if (!doc)
 615         {
 616             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 617             *addinfo = odr_strdup(odr, database.c_str());
 618             BackendPtr b;
 619             return b;
 620         }
 621         const xmlNode *ptr = xmlDocGetRootElement(doc);
 622         if (ptr)
 623         {   // presumably ptr is a records element node
 624             // parse first record in document
 625             for (ptr = ptr->children; ptr; ptr = ptr->next)
 626             {
 627                 if (ptr->type == XML_ELEMENT_NODE
 628                     && !strcmp((const char *) ptr->name, "record"))
 629                 {
 630                     sptr = m_p->parse_torus_record(ptr);
 631                     break;
 632                 }
 633             }
 634         }
 635         xmlFreeDoc(doc);
 636     }
 637
 638     if (!sptr)
 639     {
 640         *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 641         *addinfo = odr_strdup(odr, database.c_str());
 642         BackendPtr b;
 643         return b;
 644     }
 645
 646     xsltStylesheetPtr xsp = 0;
 647     if (sptr->transform_xsl_fname.length())
 648     {
 649         const char *path = 0;
 650
 651         if (m_p->xsldir.length())
 652             path = m_p->xsldir.c_str();
 653         else
 654             path = m_p->file_path.c_str();
 655         std::string fname;
 656
 657         char fullpath[1024];
 658         char *cp = yaz_filepath_resolve(sptr->transform_xsl_fname.c_str(),
 659                                         path, 0, fullpath);
 660         if (cp)
 661             fname.assign(cp);
 662         else
 663         {
 664             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 665             *addinfo = (char *)
 666                 odr_malloc(odr, 40 + sptr->transform_xsl_fname.length());
 667             sprintf(*addinfo, "File could not be read: %s",
 668                     sptr->transform_xsl_fname.c_str());
 669             BackendPtr b;
 670             return b;
 671         }
 672         xmlDoc *xsp_doc = xmlParseFile(fname.c_str());
 673         if (!xsp_doc)
 674         {
 675             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 676             *addinfo = (char *) odr_malloc(odr, 40 + fname.length());
 677             sprintf(*addinfo, "xmlParseFile failed. File: %s", fname.c_str());
 678             BackendPtr b;
 679             return b;
 680         }
 681         xsp = xsltParseStylesheetDoc(xsp_doc);
 682         if (!xsp)
 683         {
 684             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 685             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
 686             BackendPtr b;
 687             xmlFreeDoc(xsp_doc);
 688             return b;
 689         }
 690     }
 691
 692     m_backend.reset();
 693
 694     BackendPtr b(new Backend(sptr));
 695
 696     b->xsp = xsp;
 697     b->m_frontend_database = database;
 698     std::string authentication = sptr->authentication;
 699
 700     b->set_option("timeout", "40");
 701
 702     if (sptr->query_encoding.length())
 703         b->set_option("rpnCharset", sptr->query_encoding.c_str());
 704
 705     if (sptr->cfAuth.length())
 706     {
 707         // A CF target
 708         b->set_option("user", sptr->cfAuth.c_str());
 709         if (db_args.length() == 0)
 710         {
 711             if (authentication.length())
 712             {
 713                 // no database (auth) args specified already.. and the
 714                 // Torus authentication has it.. Generate the args that CF
 715                 // understands..
 716                 size_t found = authentication.find('/');
 717                 if (found != std::string::npos)
 718                 {
 719                     db_args += "user=" + mp::util::uri_encode(authentication.substr(0, found))
 720                         + "&password=" + mp::util::uri_encode(authentication.substr(found+1));
 721                 }
 722                 else
 723                     db_args += "user=" + mp::util::uri_encode(authentication);
 724             }
 725             if (sptr->cfProxy.length())
 726             {
 727                 if (db_args.length())
 728                     db_args += "&";
 729                 db_args += "proxy=" + mp::util::uri_encode(sptr->cfProxy);
 730             }
 731         }
 732         if (sptr->cfSubDb.length())
 733         {
 734             if (db_args.length())
 735                 db_args += "&";
 736             db_args += "subdatabase=" + mp::util::uri_encode(sptr->cfSubDb);
 737         }
 738     }
 739     else
 740     {
 741         // A non-CF target
 742         if (db_args.length())
 743         {
 744             // user has specified backend authentication
 745             const char *param_user = 0;
 746             const char *param_password = 0;
 747             char **names;
 748             char **values;
 749             int i;
 750             int no_parms = yaz_uri_to_array(db_args.c_str(),
 751                                             odr, &names, &values);
 752             for (i = 0; i < no_parms; i++)
 753             {
 754                 const char *name = names[i];
 755                 const char *value = values[i];
 756                 if (!strcmp(name, "user"))
 757                     param_user = value;
 758                 else if (!strcmp(name, "password"))
 759                     param_password = value;
 760                 else if (!strcmp(name, "proxy"))
 761                     sru_proxy = value;
 762                 else
 763                 {
 764                     BackendPtr notfound;
 765                     char *msg = (char*) odr_malloc(odr, strlen(name) + 30);
 766                     *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 767                     sprintf(msg, "Bad database argument: %s", name);
 768                     *addinfo = msg;
 769                     return notfound;
 770                 }
 771             }
 772             if (param_user && param_password)
 773             {
 774                 char *auth = (char*) odr_malloc(
 775                     odr, strlen(param_user) + strlen(param_password) + 2);
 776                 strcpy(auth, param_user);
 777                 strcat(auth, "/");
 778                 strcat(auth, param_password);
 779                 b->set_option("user", auth);
 780             }
 781             db_args.clear(); // no arguments to be passed (non-CF)
 782         }
 783         else
 784         {
 785             // use authentication from Torus, if given
 786             if (authentication.length())
 787                 b->set_option("user", authentication.c_str());
 788         }
 789     }
 790
 791     if (sru_proxy)
 792         b->set_option("proxy", sru_proxy);
 793
 794     std::string url;
 795     if (sptr->sru.length())
 796     {
 797         url = "http://" + sptr->target;
 798         b->set_option("sru", sptr->sru.c_str());
 799     }
 800     else
 801     {
 802         url = sptr->target;
 803     }
 804     if (db_args.length())
 805         url += "," + db_args;
 806     yaz_log(YLOG_LOG, "url=%s", url.c_str());
 807     b->connect(url, error, addinfo, odr);
 808     if (*error == 0)
 809     {
 810         m_backend = b;
 811     }
 812     return b;
 813 }
 814
 815 Z_Records *yf::Zoom::Frontend::get_records(Odr_int start,
 816                                            Odr_int number_to_present,
 817                                            int *error,
 818                                            char **addinfo,
 819                                            Odr_int *number_of_records_returned,
 820                                            ODR odr,
 821                                            BackendPtr b,
 822                                            Odr_oid *preferredRecordSyntax,
 823                                            const char *element_set_name)
 824 {
 825     *number_of_records_returned = 0;
 826     Z_Records *records = 0;
 827     bool enable_pz2_retrieval = false; // whether target profile is used
 828     bool enable_pz2_transform = false; // whether XSLT is used as well
 829     bool assume_marc8_charset = false;
 830
 831     if (start < 0 || number_to_present <= 0)
 832         return records;
 833
 834     if (number_to_present > 10000)
 835         number_to_present = 10000;
 836
 837     ZOOM_record *recs = (ZOOM_record *)
 838         odr_malloc(odr, number_to_present * sizeof(*recs));
 839
 840     char oid_name_str[OID_STR_MAX];
 841     const char *syntax_name = 0;
 842
 843     if (preferredRecordSyntax &&
 844         !oid_oidcmp(preferredRecordSyntax, yaz_oid_recsyn_xml)
 845         && element_set_name)
 846     {
 847         if (!strcmp(element_set_name, m_p->element_transform.c_str()))
 848         {
 849             enable_pz2_retrieval = true;
 850             enable_pz2_transform = true;
 851         }
 852         else if (!strcmp(element_set_name, m_p->element_raw.c_str()))
 853         {
 854             enable_pz2_retrieval = true;
 855         }
 856     }
 857
 858     if (enable_pz2_retrieval)
 859     {
 860         if (b->sptr->request_syntax.length())
 861         {
 862             syntax_name = b->sptr->request_syntax.c_str();
 863             const Odr_oid *syntax_oid =
 864                 yaz_string_to_oid(yaz_oid_std(), CLASS_RECSYN, syntax_name);
 865             if (!oid_oidcmp(syntax_oid, yaz_oid_recsyn_usmarc)
 866                 || !oid_oidcmp(syntax_oid, yaz_oid_recsyn_opac))
 867                 assume_marc8_charset = true;
 868         }
 869     }
 870     else if (preferredRecordSyntax)
 871         syntax_name =
 872             yaz_oid_to_string_buf(preferredRecordSyntax, 0, oid_name_str);
 873
 874     b->set_option("preferredRecordSyntax", syntax_name);
 875
 876     if (enable_pz2_retrieval)
 877     {
 878         element_set_name = 0;
 879         if (b->sptr->element_set.length())
 880             element_set_name = b->sptr->element_set.c_str();
 881     }
 882
 883     b->set_option("elementSetName", element_set_name);
 884
 885     b->present(start, number_to_present, recs, error, addinfo, odr);
 886
 887     Odr_int i = 0;
 888     if (!*error)
 889     {
 890         for (i = 0; i < number_to_present; i++)
 891             if (!recs[i])
 892                 break;
 893     }
 894     if (i > 0)
 895     {  // only return records if no error and at least one record
 896         char *odr_database = odr_strdup(odr,
 897                                         b->m_frontend_database.c_str());
 898         Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
 899             odr_malloc(odr, sizeof(*npl));
 900         *number_of_records_returned = i;
 901         npl->num_records = i;
 902         npl->records = (Z_NamePlusRecord **)
 903             odr_malloc(odr, i * sizeof(*npl->records));
 904         for (i = 0; i < number_to_present; i++)
 905         {
 906             Z_NamePlusRecord *npr = 0;
 907             const char *addinfo;
 908             int sur_error = ZOOM_record_error(recs[i], 0 /* msg */,
 909                                               &addinfo, 0 /* diagset */);
 910
 911             if (sur_error)
 912             {
 913                 npr = zget_surrogateDiagRec(odr, odr_database, sur_error,
 914                                             addinfo);
 915             }
 916             else if (enable_pz2_retrieval)
 917             {
 918                 char rec_type_str[100];
 919                 const char *record_encoding = 0;
 920
 921                 if (b->sptr->record_encoding.length())
 922                     record_encoding = b->sptr->record_encoding.c_str();
 923                 else if (assume_marc8_charset)
 924                     record_encoding = "marc8";
 925
 926                 strcpy(rec_type_str, b->sptr->use_turbomarc ? "txml" : "xml");
 927                 if (record_encoding)
 928                 {
 929                     strcat(rec_type_str, "; charset=");
 930                     strcat(rec_type_str, record_encoding);
 931                 }
 932
 933                 int rec_len;
 934                 xmlChar *xmlrec_buf = 0;
 935                 const char *rec_buf = ZOOM_record_get(recs[i], rec_type_str,
 936                                                       &rec_len);
 937                 if (rec_buf && b->xsp && enable_pz2_transform)
 938                 {
 939                     xmlDoc *rec_doc = xmlParseMemory(rec_buf, rec_len);
 940                     if (rec_doc)
 941                     {
 942                         xmlDoc *rec_res;
 943                         rec_res = xsltApplyStylesheet(b->xsp, rec_doc, 0);
 944
 945                         if (rec_res)
 946                             xsltSaveResultToString(&xmlrec_buf, &rec_len,
 947                                                    rec_res, b->xsp);
 948                         rec_buf = (const char *) xmlrec_buf;
 949                         xmlFreeDoc(rec_doc);
 950                         xmlFreeDoc(rec_res);
 951                     }
 952                 }
 953
 954                 if (rec_buf)
 955                 {
 956                     xmlDoc *doc = xmlParseMemory(rec_buf, rec_len);
 957                     std::string res =
 958                         mp::xml::url_recipe_handle(doc, b->sptr->urlRecipe);
 959                     if (res.length() && b->sptr->contentConnector.length())
 960                     {
 961                         yaz_log(YLOG_LOG, "contentConnector: %s",
 962                                 b->sptr->contentConnector.c_str());
 963                         size_t off = res.find_first_of("://");
 964                         if (off != std::string::npos)
 965                         {
 966                             char tmp[1024];
 967                             long id = 12345;
 968                             sprintf(tmp, "%ld.%s/",
 969                                     id, m_p->content_proxy_server.c_str());
 970                             res.insert(off + 3, tmp);
 971                         }
 972                     }
 973                     if (res.length())
 974                     {
 975                         xmlNode *ptr = xmlDocGetRootElement(doc);
 976                         while (ptr && ptr->type != XML_ELEMENT_NODE)
 977                             ptr = ptr->next;
 978                         xmlNode *c =
 979                             xmlNewChild(ptr, 0, BAD_CAST "generated-url", 0);
 980                         xmlNode * t = xmlNewText(BAD_CAST res.c_str());
 981                         xmlAddChild(c, t);
 982
 983                         if (xmlrec_buf)
 984                             xmlFree(xmlrec_buf);
 985
 986                         xmlDocDumpMemory(doc, &xmlrec_buf, &rec_len);
 987                         rec_buf = (const char *) xmlrec_buf;
 988                     }
 989                     xmlFreeDoc(doc);
 990                 }
 991                 if (rec_buf)
 992                 {
 993                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
 994                     npr->databaseName = odr_database;
 995                     npr->which = Z_NamePlusRecord_databaseRecord;
 996                     npr->u.databaseRecord =
 997                         z_ext_record_xml(odr, rec_buf, rec_len);
 998                 }
 999                 else
1000                 {
1001                     npr = zget_surrogateDiagRec(
1002                         odr, odr_database,
1003                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1004                         rec_type_str);
1005                 }
1006                 if (xmlrec_buf)
1007                     xmlFree(xmlrec_buf);
1008             }
1009             else
1010             {
1011                 Z_External *ext =
1012                     (Z_External *) ZOOM_record_get(recs[i], "ext", 0);
1013                 if (ext)
1014                 {
1015                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1016                     npr->databaseName = odr_database;
1017                     npr->which = Z_NamePlusRecord_databaseRecord;
1018                     npr->u.databaseRecord = ext;
1019                 }
1020                 else
1021                 {
1022                     npr = zget_surrogateDiagRec(
1023                         odr, odr_database,
1024                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1025                         "ZOOM_record, type ext");
1026                 }
1027             }
1028             npl->records[i] = npr;
1029         }
1030         records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1031         records->which = Z_Records_DBOSD;
1032         records->u.databaseOrSurDiagnostics = npl;
1033     }
1034     return records;
1035 }
1036
1037 struct cql_node *yf::Zoom::Impl::convert_cql_fields(struct cql_node *cn,
1038                                                     ODR odr)
1039 {
1040     struct cql_node *r = 0;
1041     if (!cn)
1042         return 0;
1043     switch (cn->which)
1044     {
1045     case CQL_NODE_ST:
1046         if (cn->u.st.index)
1047         {
1048             std::map<std::string,std::string>::const_iterator it;
1049             it = fieldmap.find(cn->u.st.index);
1050             if (it == fieldmap.end())
1051                 return cn;
1052             if (it->second.length())
1053                 cn->u.st.index = odr_strdup(odr, it->second.c_str());
1054             else
1055                 cn->u.st.index = 0;
1056         }
1057         break;
1058     case CQL_NODE_BOOL:
1059         r = convert_cql_fields(cn->u.boolean.left, odr);
1060         if (!r)
1061             r = convert_cql_fields(cn->u.boolean.right, odr);
1062         break;
1063     case CQL_NODE_SORT:
1064         r = convert_cql_fields(cn->u.sort.search, odr);
1065         break;
1066     }
1067     return r;
1068 }
1069
1070 void yf::Zoom::Frontend::handle_search(mp::Package &package)
1071 {
1072     Z_GDU *gdu = package.request().get();
1073     Z_APDU *apdu_req = gdu->u.z3950;
1074     Z_APDU *apdu_res = 0;
1075     mp::odr odr;
1076     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1077     if (sr->num_databaseNames != 1)
1078     {
1079         apdu_res = odr.create_searchResponse(
1080             apdu_req, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
1081         package.response() = apdu_res;
1082         return;
1083     }
1084
1085     int error = 0;
1086     char *addinfo = 0;
1087     std::string db(sr->databaseNames[0]);
1088     BackendPtr b = get_backend_from_databases(db, &error, &addinfo, odr);
1089     if (error)
1090     {
1091         apdu_res =
1092             odr.create_searchResponse(apdu_req, error, addinfo);
1093         package.response() = apdu_res;
1094         return;
1095     }
1096
1097     b->set_option("setname", "default");
1098
1099     Odr_int hits = 0;
1100     Z_Query *query = sr->query;
1101     WRBUF ccl_wrbuf = 0;
1102     WRBUF pqf_wrbuf = 0;
1103
1104     if (query->which == Z_Query_type_1 || query->which == Z_Query_type_101)
1105     {
1106         // RPN
1107         pqf_wrbuf = wrbuf_alloc();
1108         yaz_rpnquery_to_wrbuf(pqf_wrbuf, query->u.type_1);
1109     }
1110     else if (query->which == Z_Query_type_2)
1111     {
1112         // CCL
1113         ccl_wrbuf = wrbuf_alloc();
1114         wrbuf_write(ccl_wrbuf, (const char *) query->u.type_2->buf,
1115                     query->u.type_2->len);
1116     }
1117     else if (query->which == Z_Query_type_104 &&
1118              query->u.type_104->which == Z_External_CQL)
1119     {
1120         // CQL
1121         const char *cql = query->u.type_104->u.cql;
1122         CQL_parser cp = cql_parser_create();
1123         int r = cql_parser_string(cp, cql);
1124         if (r)
1125         {
1126             cql_parser_destroy(cp);
1127             apdu_res =
1128                 odr.create_searchResponse(apdu_req,
1129                                           YAZ_BIB1_MALFORMED_QUERY,
1130                                           "CQL syntax error");
1131             package.response() = apdu_res;
1132             return;
1133         }
1134         struct cql_node *cn = cql_parser_result(cp);
1135         struct cql_node *cn_error = m_p->convert_cql_fields(cn, odr);
1136         if (cn_error)
1137         {
1138             // hopefully we are getting a ptr to a index+relation+term node
1139             addinfo = 0;
1140             if (cn_error->which == CQL_NODE_ST)
1141                 addinfo = cn_error->u.st.index;
1142
1143             apdu_res =
1144                 odr.create_searchResponse(apdu_req,
1145                                           YAZ_BIB1_UNSUPP_USE_ATTRIBUTE,
1146                                           addinfo);
1147             package.response() = apdu_res;
1148             return;
1149         }
1150         char ccl_buf[1024];
1151
1152         r = cql_to_ccl_buf(cn, ccl_buf, sizeof(ccl_buf));
1153         if (r == 0)
1154         {
1155             ccl_wrbuf = wrbuf_alloc();
1156             wrbuf_puts(ccl_wrbuf, ccl_buf);
1157         }
1158         cql_parser_destroy(cp);
1159         if (r)
1160         {
1161             apdu_res =
1162                 odr.create_searchResponse(apdu_req,
1163                                           YAZ_BIB1_MALFORMED_QUERY,
1164                                           "CQL to CCL conversion error");
1165             package.response() = apdu_res;
1166             return;
1167         }
1168     }
1169     else
1170     {
1171         apdu_res =
1172             odr.create_searchResponse(apdu_req, YAZ_BIB1_QUERY_TYPE_UNSUPP, 0);
1173         package.response() = apdu_res;
1174         return;
1175     }
1176
1177     if (ccl_wrbuf)
1178     {
1179         // CCL to PQF
1180         assert(pqf_wrbuf == 0);
1181         int cerror, cpos;
1182         struct ccl_rpn_node *cn;
1183         yaz_log(YLOG_LOG, "CCL: %s", wrbuf_cstr(ccl_wrbuf));
1184         cn = ccl_find_str(b->sptr->ccl_bibset, wrbuf_cstr(ccl_wrbuf),
1185                           &cerror, &cpos);
1186         wrbuf_destroy(ccl_wrbuf);
1187         if (!cn)
1188         {
1189             char *addinfo = odr_strdup(odr, ccl_err_msg(cerror));
1190             int z3950_diag = YAZ_BIB1_MALFORMED_QUERY;
1191
1192             switch (cerror)
1193             {
1194             case CCL_ERR_UNKNOWN_QUAL:
1195                 z3950_diag = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1196                 break;
1197             case CCL_ERR_TRUNC_NOT_LEFT:
1198             case CCL_ERR_TRUNC_NOT_RIGHT:
1199             case CCL_ERR_TRUNC_NOT_BOTH:
1200                 z3950_diag = YAZ_BIB1_UNSUPP_TRUNCATION_ATTRIBUTE;
1201                 break;
1202             }
1203             apdu_res =
1204                 odr.create_searchResponse(apdu_req, z3950_diag, addinfo);
1205             package.response() = apdu_res;
1206             return;
1207         }
1208         pqf_wrbuf = wrbuf_alloc();
1209         ccl_pquery(pqf_wrbuf, cn);
1210         ccl_rpn_delete(cn);
1211     }
1212
1213     assert(pqf_wrbuf);
1214     if (b->get_option("sru"))
1215     {
1216         int status = 0;
1217         Z_RPNQuery *zquery;
1218         zquery = p_query_rpn(odr, wrbuf_cstr(pqf_wrbuf));
1219         WRBUF wrb = wrbuf_alloc();
1220
1221         if (!strcmp(b->get_option("sru"), "solr"))
1222         {
1223             solr_transform_t cqlt = solr_transform_create();
1224
1225             status = solr_transform_rpn2solr_wrbuf(cqlt, wrb, zquery);
1226
1227             solr_transform_close(cqlt);
1228         }
1229         else
1230         {
1231             cql_transform_t cqlt = cql_transform_create();
1232
1233             status = cql_transform_rpn2cql_wrbuf(cqlt, wrb, zquery);
1234
1235             cql_transform_close(cqlt);
1236         }
1237         if (status == 0)
1238         {
1239             yaz_log(YLOG_LOG, "search CQL: %s", wrbuf_cstr(wrb));
1240             b->search_cql(wrbuf_cstr(wrb), &hits, &error, &addinfo, odr);
1241         }
1242
1243         wrbuf_destroy(wrb);
1244         wrbuf_destroy(pqf_wrbuf);
1245         if (status)
1246         {
1247             apdu_res =
1248                 odr.create_searchResponse(apdu_req, YAZ_BIB1_MALFORMED_QUERY,
1249                                           "can not convert from RPN to CQL/SOLR");
1250             package.response() = apdu_res;
1251             return;
1252         }
1253     }
1254     else
1255     {
1256         yaz_log(YLOG_LOG, "search PQF: %s", wrbuf_cstr(pqf_wrbuf));
1257         b->search_pqf(wrbuf_cstr(pqf_wrbuf), &hits, &error, &addinfo, odr);
1258         wrbuf_destroy(pqf_wrbuf);
1259     }
1260
1261
1262     const char *element_set_name = 0;
1263     Odr_int number_to_present = 0;
1264     if (!error)
1265         mp::util::piggyback_sr(sr, hits, number_to_present, &element_set_name);
1266
1267     Odr_int number_of_records_returned = 0;
1268     Z_Records *records = get_records(
1269         0, number_to_present, &error, &addinfo,
1270         &number_of_records_returned, odr, b, sr->preferredRecordSyntax,
1271         element_set_name);
1272     apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1273     if (records)
1274     {
1275         apdu_res->u.searchResponse->records = records;
1276         apdu_res->u.searchResponse->numberOfRecordsReturned =
1277             odr_intdup(odr, number_of_records_returned);
1278     }
1279     apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1280     package.response() = apdu_res;
1281 }
1282
1283 void yf::Zoom::Frontend::handle_present(mp::Package &package)
1284 {
1285     Z_GDU *gdu = package.request().get();
1286     Z_APDU *apdu_req = gdu->u.z3950;
1287     Z_APDU *apdu_res = 0;
1288     Z_PresentRequest *pr = apdu_req->u.presentRequest;
1289
1290     mp::odr odr;
1291     if (!m_backend)
1292     {
1293         package.response() = odr.create_presentResponse(
1294             apdu_req, YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST, 0);
1295         return;
1296     }
1297     const char *element_set_name = 0;
1298     Z_RecordComposition *comp = pr->recordComposition;
1299     if (comp && comp->which != Z_RecordComp_simple)
1300     {
1301         package.response() = odr.create_presentResponse(
1302             apdu_req,
1303             YAZ_BIB1_PRESENT_COMP_SPEC_PARAMETER_UNSUPP, 0);
1304         return;
1305     }
1306     if (comp && comp->u.simple->which == Z_ElementSetNames_generic)
1307         element_set_name = comp->u.simple->u.generic;
1308     Odr_int number_of_records_returned = 0;
1309     int error = 0;
1310     char *addinfo = 0;
1311     Z_Records *records = get_records(
1312         *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
1313         &error, &addinfo, &number_of_records_returned, odr, m_backend,
1314         pr->preferredRecordSyntax, element_set_name);
1315
1316     apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
1317     if (records)
1318     {
1319         apdu_res->u.presentResponse->records = records;
1320         apdu_res->u.presentResponse->numberOfRecordsReturned =
1321             odr_intdup(odr, number_of_records_returned);
1322     }
1323     package.response() = apdu_res;
1324 }
1325
1326 void yf::Zoom::Frontend::handle_package(mp::Package &package)
1327 {
1328     Z_GDU *gdu = package.request().get();
1329     if (!gdu)
1330         ;
1331     else if (gdu->which == Z_GDU_Z3950)
1332     {
1333         Z_APDU *apdu_req = gdu->u.z3950;
1334         if (apdu_req->which == Z_APDU_initRequest)
1335         {
1336             mp::odr odr;
1337             package.response() = odr.create_close(
1338                 apdu_req,
1339                 Z_Close_protocolError,
1340                 "double init");
1341         }
1342         else if (apdu_req->which == Z_APDU_searchRequest)
1343         {
1344             handle_search(package);
1345         }
1346         else if (apdu_req->which == Z_APDU_presentRequest)
1347         {
1348             handle_present(package);
1349         }
1350         else
1351         {
1352             mp::odr odr;
1353             package.response() = odr.create_close(
1354                 apdu_req,
1355                 Z_Close_protocolError,
1356                 "zoom filter cannot handle this APDU");
1357             package.session().close();
1358         }
1359     }
1360     else
1361     {
1362         package.session().close();
1363     }
1364 }
1365
1366 void yf::Zoom::Impl::process(mp::Package &package)
1367 {
1368     FrontendPtr f = get_frontend(package);
1369     Z_GDU *gdu = package.request().get();
1370
1371     if (f->m_is_virtual)
1372     {
1373         f->handle_package(package);
1374     }
1375     else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
1376              Z_APDU_initRequest)
1377     {
1378         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
1379         f->m_init_gdu = gdu;
1380
1381         mp::odr odr;
1382         Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
1383         Z_InitResponse *resp = apdu->u.initResponse;
1384
1385         int i;
1386         static const int masks[] = {
1387             Z_Options_search,
1388             Z_Options_present,
1389             -1
1390         };
1391         for (i = 0; masks[i] != -1; i++)
1392             if (ODR_MASK_GET(req->options, masks[i]))
1393                 ODR_MASK_SET(resp->options, masks[i]);
1394
1395         static const int versions[] = {
1396             Z_ProtocolVersion_1,
1397             Z_ProtocolVersion_2,
1398             Z_ProtocolVersion_3,
1399             -1
1400         };
1401         for (i = 0; versions[i] != -1; i++)
1402             if (ODR_MASK_GET(req->protocolVersion, versions[i]))
1403                 ODR_MASK_SET(resp->protocolVersion, versions[i]);
1404             else
1405                 break;
1406
1407         *resp->preferredMessageSize = *req->preferredMessageSize;
1408         *resp->maximumRecordSize = *req->maximumRecordSize;
1409
1410         package.response() = apdu;
1411         f->m_is_virtual = true;
1412     }
1413     else
1414         package.move();
1415
1416     release_frontend(package);
1417 }
1418
1419
1420 static mp::filter::Base* filter_creator()
1421 {
1422     return new mp::filter::Zoom;
1423 }
1424
1425 extern "C" {
1426     struct metaproxy_1_filter_struct metaproxy_1_filter_zoom = {
1427         0,
1428         "zoom",
1429         filter_creator
1430     };
1431 }
1432
1433
1434 /*
1435  * Local variables:
1436  * c-basic-offset: 4
1437  * c-file-style: "Stroustrup"
1438  * indent-tabs-mode: nil
1439  * End:
1440  * vim: shiftwidth=4 tabstop=8 expandtab
1441  */
1442