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