src/record_render.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file record_render.c
   7  * \brief Render Z39.50 records (NamePlusRecord)
   8  */
   9 #if HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <assert.h>
  14 #include <string.h>
  15 #include <errno.h>
  16
  17 #include <yaz/marcdisp.h>
  18 #include <yaz/record_render.h>
  19 #include <yaz/yaz-iconv.h>
  20 #include <yaz/proto.h>
  21 #include <yaz/oid_db.h>
  22 #include <yaz/nmem_xml.h>
  23 #include <yaz/base64.h>
  24
  25 #if YAZ_HAVE_XML2
  26 #include <libxml/xpath.h>
  27 #include <libxml/xpathInternals.h>
  28 #endif
  29
  30 static yaz_iconv_t iconv_create_charset(const char *record_charset,
  31                                         yaz_iconv_t *cd2)
  32 {
  33     char charset_buf[40];
  34     yaz_iconv_t cd = 0;
  35     char *from_set1 = 0;
  36     char *from_set2 = 0;
  37     char *to_set = "utf-8";
  38     if (record_charset && *record_charset)
  39     {
  40         char *cp = charset_buf;
  41
  42         strncpy(charset_buf, record_charset, sizeof(charset_buf)-1);
  43         charset_buf[sizeof(charset_buf)-1] = '\0';
  44
  45         from_set1 = cp;
  46         while (*cp && *cp != ',' && *cp != '/')
  47             cp++;
  48         if (*cp == '/')
  49         {
  50             *cp++ = '\0'; /* terminate from_set1 */
  51             from_set2 = cp;
  52             while (*cp && *cp != ',')
  53                 cp++;
  54         }
  55         if (*cp == ',')
  56         {
  57             *cp++ = '\0';  /* terminate from_set1 or from_set2 */
  58             to_set = cp;
  59             while (*cp)
  60                 cp++;
  61         }
  62     }
  63
  64     if (from_set1)
  65         cd = yaz_iconv_open(to_set, from_set1);
  66     if (cd2)
  67     {
  68         if (from_set2)
  69             *cd2 = yaz_iconv_open(to_set, from_set2);
  70         else
  71             *cd2 = 0;
  72     }
  73     return cd;
  74 }
  75
  76 static const char *return_marc_record(WRBUF wrbuf,
  77                                       int marc_type,
  78                                       int *len,
  79                                       const char *buf, int sz,
  80                                       const char *record_charset)
  81 {
  82     yaz_iconv_t cd = iconv_create_charset(record_charset, 0);
  83     yaz_marc_t mt = yaz_marc_create();
  84     const char *ret_string = 0;
  85
  86     if (cd)
  87         yaz_marc_iconv(mt, cd);
  88     yaz_marc_xml(mt, marc_type);
  89     if (yaz_marc_decode_wrbuf(mt, buf, sz, wrbuf) > 0)
  90     {
  91         *len = wrbuf_len(wrbuf);
  92         ret_string = wrbuf_cstr(wrbuf);
  93     }
  94     yaz_marc_destroy(mt);
  95     if (cd)
  96         yaz_iconv_close(cd);
  97     return ret_string;
  98 }
  99
 100 static const char *return_opac_record(WRBUF wrbuf,
 101                                       int marc_type,
 102                                       int *len,
 103                                       Z_OPACRecord *opac_rec,
 104                                       const char *record_charset)
 105 {
 106     yaz_iconv_t cd2;
 107     yaz_iconv_t cd = iconv_create_charset(record_charset, &cd2);
 108     yaz_marc_t mt = yaz_marc_create();
 109
 110     if (cd)
 111         yaz_marc_iconv(mt, cd);
 112     yaz_marc_xml(mt, marc_type);
 113
 114     if (cd2)
 115         yaz_opac_decode_wrbuf2(mt, opac_rec, wrbuf, cd2);
 116     else
 117         yaz_opac_decode_wrbuf(mt, opac_rec, wrbuf);
 118
 119     yaz_marc_destroy(mt);
 120
 121     if (cd)
 122         yaz_iconv_close(cd);
 123     if (cd2)
 124         yaz_iconv_close(cd2);
 125     *len = wrbuf_len(wrbuf);
 126     return wrbuf_cstr(wrbuf);
 127 }
 128
 129 static const char *return_string_record(WRBUF wrbuf,
 130                                         int *len,
 131                                         const char *buf, int sz,
 132                                         const char *record_charset)
 133 {
 134     yaz_iconv_t cd = iconv_create_charset(record_charset, 0);
 135
 136     if (cd)
 137     {
 138         wrbuf_iconv_write(wrbuf, cd, buf, sz);
 139         wrbuf_iconv_reset(wrbuf, cd);
 140
 141         buf = wrbuf_cstr(wrbuf);
 142         sz = wrbuf_len(wrbuf);
 143         yaz_iconv_close(cd);
 144     }
 145     *len = sz;
 146     return buf;
 147 }
 148
 149 static const char *return_record_wrbuf(WRBUF wrbuf, int *len,
 150                                        Z_NamePlusRecord *npr,
 151                                        int marctype, const char *charset)
 152 {
 153     Z_External *r = (Z_External *) npr->u.databaseRecord;
 154     const Odr_oid *oid = r->direct_reference;
 155
 156     wrbuf_rewind(wrbuf);
 157     /* render bibliographic record .. */
 158     if (r->which == Z_External_OPAC)
 159     {
 160         return return_opac_record(wrbuf, marctype, len,
 161                                   r->u.opac, charset);
 162     }
 163     if (r->which == Z_External_sutrs)
 164         return return_string_record(wrbuf, len,
 165                                     (char*) r->u.sutrs->buf,
 166                                     r->u.sutrs->len,
 167                                     charset);
 168     else if (r->which == Z_External_octet)
 169     {
 170         if (oid_oidcmp(oid, yaz_oid_recsyn_xml)
 171             && oid_oidcmp(oid, yaz_oid_recsyn_application_xml)
 172             && oid_oidcmp(oid, yaz_oid_recsyn_mab)
 173             && oid_oidcmp(oid, yaz_oid_recsyn_html))
 174         {
 175             const char *ret_buf = return_marc_record(
 176                 wrbuf, marctype, len,
 177                 (const char *) r->u.octet_aligned->buf,
 178                 r->u.octet_aligned->len,
 179                 charset);
 180             if (ret_buf)
 181                 return ret_buf;
 182             /* not ISO2709. Return fail unless raw (ISO2709) is wanted */
 183             if (yaz_oid_is_iso2709(oid) && marctype != YAZ_MARC_ISO2709)
 184                 return 0;
 185         }
 186         return return_string_record(wrbuf, len,
 187                                     (const char *) r->u.octet_aligned->buf,
 188                                     r->u.octet_aligned->len,
 189                                     charset);
 190     }
 191     else if (r->which == Z_External_grs1)
 192     {
 193         yaz_display_grs1(wrbuf, r->u.grs1, 0);
 194         return return_string_record(wrbuf, len,
 195                                     wrbuf_buf(wrbuf),
 196                                     wrbuf_len(wrbuf),
 197                                     charset);
 198     }
 199     return 0;
 200 }
 201
 202 static const char *get_record_format(WRBUF wrbuf, int *len,
 203                                      Z_NamePlusRecord *npr,
 204                                      int marctype, const char *charset,
 205                                      const char *format)
 206 {
 207     const char *res = return_record_wrbuf(wrbuf, len, npr, marctype, charset);
 208 #if YAZ_HAVE_XML2
 209     if (*format == '1')
 210     {
 211         /* try to XML format res */
 212         xmlDocPtr doc;
 213         xmlKeepBlanksDefault(0); /* get get xmlDocFormatMemory to work! */
 214         doc = xmlParseMemory(res, *len);
 215         if (doc)
 216         {
 217             xmlChar *xml_mem;
 218             int xml_size;
 219             xmlDocDumpFormatMemory(doc, &xml_mem, &xml_size, 1);
 220             wrbuf_rewind(wrbuf);
 221             wrbuf_write(wrbuf, (const char *) xml_mem, xml_size);
 222             xmlFree(xml_mem);
 223             xmlFreeDoc(doc);
 224             res = wrbuf_cstr(wrbuf);
 225             *len = wrbuf_len(wrbuf);
 226         }
 227     }
 228 #endif
 229     return res;
 230 }
 231
 232 #if YAZ_HAVE_XML2
 233 static int replace_node(NMEM nmem, xmlNode *ptr,
 234                         const char *type_spec, char *record_buf)
 235 {
 236     int ret = -1;
 237     const char *res;
 238     int len;
 239     int m_len;
 240     WRBUF wrbuf = wrbuf_alloc();
 241     ODR odr = odr_createmem(ODR_ENCODE);
 242     Z_NamePlusRecord *npr = odr_malloc(odr, sizeof(*npr));
 243     npr->which = Z_NamePlusRecord_databaseRecord;
 244
 245     if (atoi_n_check(record_buf, 5, &m_len))
 246         npr->u.databaseRecord =
 247             z_ext_record_usmarc(odr, record_buf, strlen(record_buf));
 248     else
 249         npr->u.databaseRecord =
 250             z_ext_record_xml(odr, record_buf, strlen(record_buf));
 251     res = yaz_record_render(npr, 0, wrbuf, type_spec, &len);
 252     if (res)
 253     {
 254         xmlDoc *doc = xmlParseMemory(res, strlen(res));
 255         if (doc)
 256         {
 257             xmlNode *nptr = xmlCopyNode(xmlDocGetRootElement(doc), 1);
 258             xmlReplaceNode(ptr, nptr);
 259             xmlFreeDoc(doc);
 260         }
 261         else
 262         {
 263             xmlNode *nptr = xmlNewText(BAD_CAST res);
 264             xmlReplaceNode(ptr, nptr);
 265         }
 266         ret = 0;
 267     }
 268     wrbuf_destroy(wrbuf);
 269     odr_destroy(odr);
 270     return ret;
 271 }
 272 #endif
 273
 274 static const char *base64_render(NMEM nmem, WRBUF wrbuf,
 275                                  const char *buf, int *len,
 276                                  const char *expr, const char *type_spec)
 277 {
 278 #if YAZ_HAVE_XML2
 279     xmlDocPtr doc = xmlParseMemory(buf, *len);
 280     if (doc)
 281     {
 282         xmlChar *buf_out;
 283         int len_out;
 284         xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
 285         if (xpathCtx)
 286         {
 287             xmlXPathObjectPtr xpathObj =
 288                 xmlXPathEvalExpression((const xmlChar *) expr, xpathCtx);
 289             if (xpathObj)
 290             {
 291                 xmlNodeSetPtr nodes = xpathObj->nodesetval;
 292                 if (nodes)
 293                 {
 294                     int i;
 295                     for (i = 0; i < nodes->nodeNr; i++)
 296                     {
 297                         xmlNode *ptr = nodes->nodeTab[i];
 298                         if (ptr->type == XML_TEXT_NODE)
 299                         {
 300                             const char *input =
 301                                 nmem_text_node_cdata(ptr, nmem);
 302                             char *output = nmem_malloc(
 303                                 nmem, strlen(input) + 1);
 304                             if (yaz_base64decode(input, output) == 0)
 305                             {
 306                                 if (!replace_node(nmem, ptr, type_spec, output))
 307                                 {
 308                                     /* replacement OK */
 309                                     xmlFreeNode(ptr);
 310                                     /* unset below to avoid a bad reference in
 311                                        xmlXPathFreeObject below */
 312                                     nodes->nodeTab[i] = 0;
 313                                 }
 314                             }
 315                         }
 316                     }
 317                 }
 318                 xmlXPathFreeObject(xpathObj);
 319             }
 320             xmlXPathFreeContext(xpathCtx);
 321         }
 322         xmlDocDumpMemory(doc, &buf_out, &len_out);
 323         if (buf_out)
 324         {
 325             wrbuf_rewind(wrbuf);
 326             wrbuf_write(wrbuf, (const char *) buf_out, len_out);
 327             buf = wrbuf_cstr(wrbuf);
 328             *len = len_out;
 329         }
 330         xmlFreeDoc(doc);
 331         xmlFree(buf_out);
 332     }
 333 #endif
 334     return buf;
 335 }
 336
 337 const char *yaz_record_render(Z_NamePlusRecord *npr, const char *schema,
 338                               WRBUF wrbuf,
 339                               const char *type_spec, int *len)
 340 {
 341     const char *ret = 0;
 342     NMEM nmem = 0;
 343     char *base64_xpath = 0;
 344     size_t i;
 345     char type[40];
 346     char charset[40];
 347     char format[3];
 348     const char *cp = type_spec;
 349     int len0;
 350
 351     if (!len)
 352         len = &len0;
 353
 354     for (i = 0; cp[i] && cp[i] != ';' && cp[i] != ' ' && i < sizeof(type)-1;
 355          i++)
 356         type[i] = cp[i];
 357     type[i] = '\0';
 358     charset[0] = '\0';
 359     format[0] = '\0';
 360     while (1)
 361     {
 362         while (cp[i] == ' ')
 363             i++;
 364         if (cp[i] != ';')
 365             break;
 366         i++;
 367         while (cp[i] == ' ')
 368             i++;
 369         if (!strncmp(cp + i, "charset=", 8))
 370         {
 371             size_t j = 0;
 372             i = i + 8; /* skip charset= */
 373             while (cp[i] == ' ')
 374                 i++;
 375             for (j = 0; cp[i] && cp[i] != ';' && cp[i] != ' '; i++)
 376             {
 377                 if (j < sizeof(charset)-1)
 378                     charset[j++] = cp[i];
 379             }
 380             charset[j] = '\0';
 381         }
 382         else if (!strncmp(cp + i, "format=", 7))
 383         {
 384             size_t j = 0;
 385             i = i + 7;
 386             while (cp[i] == ' ')
 387                 i++;
 388             for (j = 0; cp[i] && cp[i] != ';' && cp[i] != ' '; i++)
 389             {
 390                 if (j < sizeof(format)-1)
 391                     format[j++] = cp[i];
 392             }
 393             format[j] = '\0';
 394         }
 395         else if (!strncmp(cp + i, "base64=", 7))
 396         {
 397             size_t i0;
 398             i = i + 7;
 399             while (cp[i] == ' ')
 400                 i++;
 401             i0 = i;
 402             while (cp[i] && cp[i] != ';')
 403                 i++;
 404
 405             nmem = nmem_create();
 406             base64_xpath = nmem_strdupn(nmem, cp + i0, i - i0);
 407         }
 408     }
 409     if (!strcmp(type, "database"))
 410     {
 411         *len = (npr->databaseName ? strlen(npr->databaseName) : 0);
 412         ret = npr->databaseName;
 413     }
 414     else if (!strcmp(type, "schema"))
 415     {
 416         *len = schema ? strlen(schema) : 0;
 417         ret = schema;
 418     }
 419     else if (!strcmp(type, "syntax"))
 420     {
 421         const char *desc = 0;
 422         if (npr->which == Z_NamePlusRecord_databaseRecord)
 423         {
 424             Z_External *r = (Z_External *) npr->u.databaseRecord;
 425             desc = yaz_oid_to_string(yaz_oid_std(), r->direct_reference, 0);
 426         }
 427         if (!desc)
 428             desc = "none";
 429         *len = strlen(desc);
 430         ret = desc;
 431     }
 432     if (npr->which != Z_NamePlusRecord_databaseRecord)
 433         ;
 434     else if (!strcmp(type, "render"))
 435     {
 436         ret = get_record_format(wrbuf, len, npr, YAZ_MARC_LINE, charset, format);
 437     }
 438     else if (!strcmp(type, "xml"))
 439     {
 440         ret = get_record_format(wrbuf, len, npr, YAZ_MARC_MARCXML, charset,
 441                                 format);
 442     }
 443     else if (!strcmp(type, "txml"))
 444     {
 445         ret = get_record_format(wrbuf, len, npr, YAZ_MARC_TURBOMARC, charset,
 446                                 format);
 447     }
 448     else if (!strcmp(type, "json"))
 449     {
 450         ret = get_record_format(wrbuf, len, npr, YAZ_MARC_JSON, charset,
 451                                 format);
 452     }
 453     else if (!strcmp(type, "raw"))
 454     {
 455         ret = get_record_format(wrbuf, len, npr, YAZ_MARC_ISO2709, charset,
 456                                 format);
 457     }
 458     else if (!strcmp(type, "ext"))
 459     {
 460         *len = -1;
 461         ret = (const char *) npr->u.databaseRecord;
 462     }
 463     else if (!strcmp(type, "opac"))
 464     {
 465         if (npr->u.databaseRecord->which == Z_External_OPAC)
 466             ret = get_record_format(wrbuf, len, npr, YAZ_MARC_MARCXML, charset,
 467                                     format);
 468     }
 469
 470     if (base64_xpath && *len != -1)
 471     {
 472         char *type_spec = nmem_malloc(nmem,
 473                                       strlen(type) + strlen(charset) + 11);
 474         strcpy(type_spec, type);
 475         if (*charset)
 476         {
 477             strcat(type_spec, "; charset=");
 478             strcat(type_spec, charset);
 479         }
 480         ret = base64_render(nmem, wrbuf, ret, len, base64_xpath, type_spec);
 481     }
 482     nmem_destroy(nmem);
 483     return ret;
 484 }
 485
 486 /*
 487  * Local variables:
 488  * c-basic-offset: 4
 489  * c-file-style: "Stroustrup"
 490  * indent-tabs-mode: nil
 491  * End:
 492  * vim: shiftwidth=4 tabstop=8 expandtab
 493  */
 494