src/filter_http_rewrite.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2013 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 <metaproxy/filter.hpp>
  21 #include <metaproxy/package.hpp>
  22 #include <metaproxy/util.hpp>
  23 #include "filter_http_rewrite.hpp"
  24 #include "html_parser.hpp"
  25
  26 #include <yaz/zgdu.h>
  27 #include <yaz/log.h>
  28
  29 #include <stack>
  30 #include <boost/regex.hpp>
  31 #include <boost/lexical_cast.hpp>
  32 #include <boost/algorithm/string.hpp>
  33
  34 #include <map>
  35
  36 namespace mp = metaproxy_1;
  37 namespace yf = mp::filter;
  38
  39 namespace metaproxy_1 {
  40     namespace filter {
  41         class HttpRewrite::Replace {
  42         public:
  43             bool start_anchor;
  44             boost::regex re;
  45             boost::smatch what;
  46             std::string recipe;
  47             std::map<int, std::string> group_index;
  48             std::string sub_vars(
  49                 const std::map<std::string, std::string> & vars) const;
  50             void parse_groups(std::string pattern);
  51         };
  52
  53         class HttpRewrite::Rule {
  54         public:
  55             std::list<Replace> replace_list;
  56             bool test_patterns(
  57                 std::map<std::string, std::string> &vars,
  58                 std::string &txt, bool anchor);
  59         };
  60         class HttpRewrite::Within {
  61         public:
  62             std::string header;
  63             std::string attr;
  64             std::string tag;
  65             bool reqline;
  66             RulePtr rule;
  67         };
  68
  69         class HttpRewrite::Content {
  70         public:
  71             std::string type;
  72             boost::regex content_re;
  73             std::list<Within> within_list;
  74             void configure(const xmlNode *ptr,
  75                            std::map<std::string, RulePtr > &rules);
  76             void quoted_literal(std::string &content,
  77                                 std::map<std::string, std::string> &vars) const;
  78         };
  79         class HttpRewrite::Phase {
  80         public:
  81             Phase();
  82             int m_verbose;
  83             std::list<Content> content_list;
  84             void rewrite_reqline(mp::odr & o, Z_HTTP_Request *hreq,
  85                 std::map<std::string, std::string> & vars) const;
  86             void rewrite_headers(mp::odr & o, Z_HTTP_Header *headers,
  87                 std::map<std::string, std::string> & vars) const;
  88             void rewrite_body(mp::odr & o,
  89                               const char *content_type,
  90                               char **content_buf, int *content_len,
  91                               std::map<std::string, std::string> & vars) const;
  92         };
  93         class HttpRewrite::Event : public HTMLParserEvent {
  94             void openTagStart(const char *tag, int tag_len);
  95             void anyTagEnd(const char *tag, int tag_len, int close_it);
  96             void attribute(const char *tag, int tag_len,
  97                            const char *attr, int attr_len,
  98                            const char *value, int val_len,
  99                            const char *sep);
 100             void closeTag(const char *tag, int tag_len);
 101             void text(const char *value, int len);
 102             const Content *m_content;
 103             WRBUF m_w;
 104             std::stack<std::list<Within>::const_iterator> s_within;
 105             std::map<std::string, std::string> &m_vars;
 106         public:
 107             Event(const Content *p, std::map<std::string, std::string> &vars);
 108             ~Event();
 109             const char *result();
 110         };
 111     }
 112 }
 113
 114 yf::HttpRewrite::HttpRewrite() :
 115     req_phase(new Phase), res_phase(new Phase)
 116 {
 117 }
 118
 119 yf::HttpRewrite::~HttpRewrite()
 120 {
 121 }
 122
 123 void yf::HttpRewrite::process(mp::Package & package) const
 124 {
 125     yaz_log(YLOG_LOG, "HttpRewrite begins....");
 126     Z_GDU *gdu = package.request().get();
 127     //map of request/response vars
 128     std::map<std::string, std::string> vars;
 129     //we have an http req
 130     if (gdu && gdu->which == Z_GDU_HTTP_Request)
 131     {
 132         Z_HTTP_Request *hreq = gdu->u.HTTP_Request;
 133         mp::odr o;
 134         req_phase->rewrite_reqline(o, hreq, vars);
 135         yaz_log(YLOG_LOG, ">> Request headers");
 136         req_phase->rewrite_headers(o, hreq->headers, vars);
 137         req_phase->rewrite_body(o,
 138                                 z_HTTP_header_lookup(hreq->headers,
 139                                                      "Content-Type"),
 140                                 &hreq->content_buf, &hreq->content_len,
 141                                 vars);
 142         package.request() = gdu;
 143     }
 144     package.move();
 145     gdu = package.response().get();
 146     if (gdu && gdu->which == Z_GDU_HTTP_Response)
 147     {
 148         Z_HTTP_Response *hres = gdu->u.HTTP_Response;
 149         yaz_log(YLOG_LOG, "Response code %d", hres->code);
 150         mp::odr o;
 151         yaz_log(YLOG_LOG, "<< Respose headers");
 152         res_phase->rewrite_headers(o, hres->headers, vars);
 153         res_phase->rewrite_body(o,
 154                                 z_HTTP_header_lookup(hres->headers,
 155                                                      "Content-Type"),
 156                                 &hres->content_buf, &hres->content_len,
 157                                 vars);
 158         package.response() = gdu;
 159     }
 160 }
 161
 162 void yf::HttpRewrite::Phase::rewrite_reqline (mp::odr & o,
 163         Z_HTTP_Request *hreq,
 164         std::map<std::string, std::string> & vars) const
 165 {
 166     //rewrite the request line
 167     std::string path;
 168     if (strstr(hreq->path, "http://") == hreq->path)
 169     {
 170         yaz_log(YLOG_LOG, "Path in the method line is absolute, "
 171             "possibly a proxy request");
 172         path += hreq->path;
 173     }
 174     else
 175     {
 176         //TODO what about proto
 177         const char *host = z_HTTP_header_lookup(hreq->headers, "Host");
 178         if (!host)
 179             return;
 180
 181         path += "http://";
 182         path += host;
 183         path += hreq->path;
 184     }
 185
 186     std::list<Content>::const_iterator cit = content_list.begin();
 187     for (; cit != content_list.end(); cit++)
 188         if (cit->type == "headers")
 189             break;
 190
 191     if (cit == content_list.end())
 192         return;
 193
 194     std::list<Within>::const_iterator it = cit->within_list.begin();
 195     for (; it != cit->within_list.end(); it++)
 196         if (it->reqline)
 197         {
 198             yaz_log(YLOG_LOG, "Proxy request URL is %s", path.c_str());
 199             if (it->rule->test_patterns(vars, path, true))
 200             {
 201                 yaz_log(YLOG_LOG, "Rewritten request URL is %s", path.c_str());
 202                 hreq->path = odr_strdup(o, path.c_str());
 203             }
 204         }
 205 }
 206
 207 void yf::HttpRewrite::Phase::rewrite_headers(mp::odr & o,
 208         Z_HTTP_Header *headers,
 209         std::map<std::string, std::string> & vars) const
 210 {
 211     std::list<Content>::const_iterator cit = content_list.begin();
 212     for (; cit != content_list.end(); cit++)
 213         if (cit->type == "headers")
 214             break;
 215
 216     if (cit == content_list.end())
 217         return;
 218
 219     for (Z_HTTP_Header *header = headers; header; header = header->next)
 220     {
 221         std::list<Within>::const_iterator it = cit->within_list.begin();
 222         for (; it != cit->within_list.end(); it++)
 223         {
 224             if (it->header.length() > 0 &&
 225                 yaz_strcasecmp(it->header.c_str(), header->name) == 0)
 226             {
 227                 std::string sheader(header->name);
 228                 sheader += ": ";
 229                 sheader += header->value;
 230
 231                 if (it->rule->test_patterns(vars, sheader, true))
 232                 {
 233                     size_t pos = sheader.find(": ");
 234                     if (pos == std::string::npos)
 235                     {
 236                         yaz_log(YLOG_LOG, "Header malformed during rewrite, ignoring");
 237                         continue;
 238                     }
 239                     header->name = odr_strdup(
 240                         o, sheader.substr(0, pos).c_str());
 241                     header->value = odr_strdup(
 242                         o, sheader.substr(pos + 2, std::string::npos).c_str());
 243                 }
 244             }
 245         }
 246     }
 247 }
 248
 249 void yf::HttpRewrite::Phase::rewrite_body(
 250     mp::odr &o,
 251     const char *content_type,
 252     char **content_buf,
 253     int *content_len,
 254     std::map<std::string, std::string> & vars) const
 255 {
 256     std::list<Content>::const_iterator cit = content_list.begin();
 257     for (; cit != content_list.end(); cit++)
 258     {
 259         yaz_log(YLOG_LOG, "rewrite_body: content_type=%s type=%s",
 260                 content_type, cit->type.c_str());
 261         if (cit->type != "headers"
 262             && regex_match(content_type, cit->content_re))
 263             break;
 264     }
 265     if (cit == content_list.end())
 266         return;
 267
 268     if (*content_buf)
 269     {
 270         int i;
 271         for (i = 0; i < *content_len; i++)
 272             if ((*content_buf)[i] == 0)
 273                 return;  // binary content. skip
 274
 275         if (cit->type == "html")
 276         {
 277             HTMLParser parser;
 278             Event ev(&*cit, vars);
 279
 280             parser.set_verbose(m_verbose);
 281
 282             std::string buf(*content_buf, *content_len);
 283
 284             parser.parse(ev, buf.c_str());
 285             const char *res = ev.result();
 286             *content_buf = odr_strdup(o, res);
 287             *content_len = strlen(res);
 288         }
 289         if (cit->type == "quoted-literal")
 290         {
 291             std::string content(*content_buf, *content_len);
 292             cit->quoted_literal(content, vars);
 293             *content_buf = odr_strdup(o, content.c_str());
 294             *content_len = strlen(*content_buf);
 295         }
 296     }
 297 }
 298
 299 yf::HttpRewrite::Event::Event(const Content *p,
 300                               std::map<std::string, std::string> & vars
 301     ) : m_content(p), m_vars(vars)
 302 {
 303     m_w = wrbuf_alloc();
 304 }
 305
 306 yf::HttpRewrite::Event::~Event()
 307 {
 308     wrbuf_destroy(m_w);
 309 }
 310
 311 const char *yf::HttpRewrite::Event::result()
 312 {
 313     return wrbuf_cstr(m_w);
 314 }
 315
 316 void yf::HttpRewrite::Event::openTagStart(const char *tag, int tag_len)
 317 {
 318     wrbuf_putc(m_w, '<');
 319     wrbuf_write(m_w, tag, tag_len);
 320
 321     std::string t(tag, tag_len);
 322     std::list<Within>::const_iterator it = m_content->within_list.begin();
 323     for (; it != m_content->within_list.end(); it++)
 324     {
 325         if (it->tag.length() > 0 && yaz_strcasecmp(it->tag.c_str(),
 326                                                    t.c_str()) == 0)
 327         {
 328             std::vector<std::string> attr;
 329             boost::split(attr, it->attr, boost::is_any_of(","));
 330             size_t i;
 331             for (i = 0; i < attr.size(); i++)
 332             {
 333                 if (attr[i].compare("#text") == 0)
 334                 {
 335                     s_within.push(it);
 336                     return;
 337                 }
 338             }
 339         }
 340     }
 341 }
 342
 343 void yf::HttpRewrite::Event::anyTagEnd(const char *tag, int tag_len,
 344                                        int close_it)
 345 {
 346     if (close_it)
 347     {
 348         if (!s_within.empty())
 349         {
 350             std::list<Within>::const_iterator it = s_within.top();
 351             std::string t(tag, tag_len);
 352             if (yaz_strcasecmp(it->tag.c_str(), t.c_str()) == 0)
 353                 s_within.pop();
 354         }
 355     }
 356     if (close_it)
 357         wrbuf_putc(m_w, '/');
 358     wrbuf_putc(m_w, '>');
 359 }
 360
 361 void yf::HttpRewrite::Event::attribute(const char *tag, int tag_len,
 362                                        const char *attr, int attr_len,
 363                                        const char *value, int val_len,
 364                                        const char *sep)
 365 {
 366     std::list<Within>::const_iterator it = m_content->within_list.begin();
 367     bool subst = false;
 368
 369     for (; it != m_content->within_list.end(); it++)
 370     {
 371         std::string t(tag, tag_len);
 372         if (it->tag.length() == 0 ||
 373             yaz_strcasecmp(it->tag.c_str(), t.c_str()) == 0)
 374         {
 375             std::string a(attr, attr_len);
 376             std::vector<std::string> attr;
 377             boost::split(attr, it->attr, boost::is_any_of(","));
 378             size_t i;
 379             for (i = 0; i < attr.size(); i++)
 380             {
 381                 if (attr[i].compare("#text") &&
 382                     yaz_strcasecmp(attr[i].c_str(), a.c_str()) == 0)
 383                     subst = true;
 384             }
 385         }
 386         if (subst)
 387             break;
 388     }
 389
 390     wrbuf_putc(m_w, ' ');
 391     wrbuf_write(m_w, attr, attr_len);
 392     if (value)
 393     {
 394         wrbuf_puts(m_w, "=");
 395         wrbuf_puts(m_w, sep);
 396
 397         std::string output;
 398         if (subst)
 399         {
 400             std::string s(value, val_len);
 401             it->rule->test_patterns(m_vars, s, true);
 402             wrbuf_puts(m_w, s.c_str());
 403         }
 404         else
 405             wrbuf_write(m_w, value, val_len);
 406         wrbuf_puts(m_w, sep);
 407     }
 408 }
 409
 410 void yf::HttpRewrite::Event::closeTag(const char *tag, int tag_len)
 411 {
 412     if (!s_within.empty())
 413     {
 414         std::list<Within>::const_iterator it = s_within.top();
 415         std::string t(tag, tag_len);
 416         if (yaz_strcasecmp(it->tag.c_str(), t.c_str()) == 0)
 417             s_within.pop();
 418     }
 419     wrbuf_puts(m_w, "</");
 420     wrbuf_write(m_w, tag, tag_len);
 421 }
 422
 423 void yf::HttpRewrite::Event::text(const char *value, int len)
 424 {
 425     std::list<Within>::const_iterator it = m_content->within_list.end();
 426     if (!s_within.empty())
 427         it = s_within.top();
 428     if (it != m_content->within_list.end())
 429     {
 430         std::string s(value, len);
 431         it->rule->test_patterns(m_vars, s, false);
 432         wrbuf_puts(m_w, s.c_str());
 433     }
 434     else
 435         wrbuf_write(m_w, value, len);
 436 }
 437
 438 bool yf::HttpRewrite::Rule::test_patterns(
 439     std::map<std::string, std::string> & vars,
 440     std::string & txt, bool anchor)
 441 {
 442     bool replaces = false;
 443     bool first = anchor;
 444     std::string out;
 445     std::string::const_iterator start, end;
 446     start = txt.begin();
 447     end = txt.end();
 448     while (1)
 449     {
 450         std::list<Replace>::iterator bit = replace_list.end();
 451         {
 452             std::string::const_iterator best_pos = txt.end();
 453             std::list<Replace>::iterator it = replace_list.begin();
 454             for (; it != replace_list.end(); it++)
 455             {
 456                 if (it->start_anchor && !first)
 457                     continue;
 458                 if (regex_search(start, end, it->what, it->re))
 459                 {
 460                     if (it->what[0].first < best_pos)
 461                     {
 462                         best_pos = it->what[0].first;
 463                         bit = it;
 464                     }
 465                 }
 466             }
 467             if (bit == replace_list.end())
 468                 break;
 469         }
 470         first = false;
 471         replaces = true;
 472         size_t i;
 473         for (i = 1; i < bit->what.size(); ++i)
 474         {
 475             //check if the group is named
 476             std::map<int, std::string>::const_iterator git
 477                 = bit->group_index.find(i);
 478             if (git != bit->group_index.end())
 479             {   //it is
 480                 vars[git->second] = bit->what[i];
 481             }
 482
 483         }
 484         //prepare replacement string
 485         std::string rvalue = bit->sub_vars(vars);
 486         yaz_log(YLOG_LOG, "! Rewritten '%s' to '%s'",
 487                 bit->what.str(0).c_str(), rvalue.c_str());
 488         out.append(start, bit->what[0].first);
 489         out.append(rvalue);
 490         start = bit->what[0].second; //move search forward
 491     }
 492     out.append(start, end);
 493     txt = out;
 494     return replaces;
 495 }
 496
 497 void yf::HttpRewrite::Replace::parse_groups(std::string pattern)
 498 {
 499     int gnum = 0;
 500     bool esc = false;
 501     const std::string &str = pattern;
 502     std::string res;
 503     start_anchor = str[0] == '^';
 504     yaz_log(YLOG_LOG, "Parsing groups from '%s'", str.c_str());
 505     for (size_t i = 0; i < str.size(); ++i)
 506     {
 507         res += str[i];
 508         if (!esc && str[i] == '\\')
 509         {
 510             esc = true;
 511             continue;
 512         }
 513         if (!esc && str[i] == '(') //group starts
 514         {
 515             gnum++;
 516             if (i+1 < str.size() && str[i+1] == '?') //group with attrs
 517             {
 518                 i++;
 519                 if (i+1 < str.size() && str[i+1] == ':') //non-capturing
 520                 {
 521                     if (gnum > 0) gnum--;
 522                     res += str[i];
 523                     i++;
 524                     res += str[i];
 525                     continue;
 526                 }
 527                 if (i+1 < str.size() && str[i+1] == 'P') //optional, python
 528                     i++;
 529                 if (i+1 < str.size() && str[i+1] == '<') //named
 530                 {
 531                     i++;
 532                     std::string gname;
 533                     bool term = false;
 534                     while (++i < str.size())
 535                     {
 536                         if (str[i] == '>') { term = true; break; }
 537                         if (!isalnum(str[i]))
 538                             throw mp::filter::FilterException
 539                                 ("Only alphanumeric chars allowed, found "
 540                                  " in '"
 541                                  + str
 542                                  + "' at "
 543                                  + boost::lexical_cast<std::string>(i));
 544                         gname += str[i];
 545                     }
 546                     if (!term)
 547                         throw mp::filter::FilterException
 548                             ("Unterminated group name '" + gname
 549                              + " in '" + str +"'");
 550                     group_index[gnum] = gname;
 551                     yaz_log(YLOG_LOG, "Found named group '%s' at $%d",
 552                             gname.c_str(), gnum);
 553                 }
 554             }
 555         }
 556         esc = false;
 557     }
 558     re = res;
 559 }
 560
 561 std::string yf::HttpRewrite::Replace::sub_vars(
 562     const std::map<std::string, std::string> & vars) const
 563 {
 564     std::string out;
 565     bool esc = false;
 566     const std::string & in = recipe;
 567     for (size_t i = 0; i < in.size(); ++i)
 568     {
 569         if (!esc && in[i] == '\\')
 570         {
 571             esc = true;
 572             continue;
 573         }
 574         if (!esc && in[i] == '$') //var
 575         {
 576             if (i+1 < in.size() && in[i+1] == '{') //ref prefix
 577             {
 578                 ++i;
 579                 std::string name;
 580                 bool term = false;
 581                 while (++i < in.size())
 582                 {
 583                     if (in[i] == '}') { term = true; break; }
 584                     name += in[i];
 585                 }
 586                 if (!term) throw mp::filter::FilterException
 587                     ("Unterminated var ref in '"+in+"' at "
 588                      + boost::lexical_cast<std::string>(i));
 589                 std::map<std::string, std::string>::const_iterator it
 590                     = vars.find(name);
 591                 if (it != vars.end())
 592                 {
 593                     out += it->second;
 594                 }
 595             }
 596             else
 597             {
 598                 throw mp::filter::FilterException
 599                     ("Malformed or trimmed var ref in '"
 600                      +in+"' at "+boost::lexical_cast<std::string>(i));
 601             }
 602             continue;
 603         }
 604         //passthru
 605         out += in[i];
 606         esc = false;
 607     }
 608     return out;
 609 }
 610
 611 yf::HttpRewrite::Phase::Phase() : m_verbose(0)
 612 {
 613 }
 614
 615 void yf::HttpRewrite::Content::quoted_literal(
 616     std::string &content,
 617     std::map<std::string, std::string> &vars) const
 618 {
 619     std::string res;
 620     const char *cp = content.c_str();
 621     const char *cp0 = cp;
 622     while (*cp)
 623     {
 624         if (*cp == '"' || *cp == '\'')
 625         {
 626             int m = *cp;
 627             cp++;
 628             res.append(cp0, cp - cp0);
 629             cp0 = cp;
 630             while (*cp)
 631             {
 632                 if (cp[-1] != '\\' && *cp == m)
 633                     break;
 634                 if (*cp == '\n')
 635                     break;
 636                 cp++;
 637             }
 638             if (!*cp)
 639                 break;
 640             std::list<Within>::const_iterator it = within_list.begin();
 641             std::string s(cp0, cp - cp0);
 642             if (it != within_list.end())
 643                 it->rule->test_patterns(vars, s, true);
 644             cp0 = cp;
 645             res.append(s);
 646         }
 647         else if (*cp == '/' && cp[1] == '/')
 648         {
 649             while (cp[1] && cp[1] != '\n')
 650                 cp++;
 651         }
 652         cp++;
 653     }
 654     res.append(cp0, cp - cp0);
 655     content = res;
 656 }
 657
 658 void yf::HttpRewrite::Content::configure(
 659     const xmlNode *ptr, std::map<std::string, RulePtr > &rules)
 660 {
 661     for (; ptr; ptr = ptr->next)
 662     {
 663         if (ptr->type != XML_ELEMENT_NODE)
 664             continue;
 665         if (!strcmp((const char *) ptr->name, "within"))
 666         {
 667             static const char *names[6] =
 668                 { "header", "attr", "tag", "rule", "reqline", 0 };
 669             std::string values[5];
 670             mp::xml::parse_attr(ptr, names, values);
 671             Within w;
 672             w.header = values[0];
 673             w.attr = values[1];
 674             w.tag = values[2];
 675             std::map<std::string,RulePtr>::const_iterator it =
 676                 rules.find(values[3]);
 677             if (it == rules.end())
 678                 throw mp::filter::FilterException
 679                     ("Reference to non-existing rule '" + values[3] +
 680                      "' in http_rewrite filter");
 681             w.rule = it->second;
 682             w.reqline = values[4] == "1";
 683             within_list.push_back(w);
 684         }
 685     }
 686 }
 687
 688 void yf::HttpRewrite::configure_phase(const xmlNode *ptr, Phase &phase)
 689 {
 690     static const char *names[2] = { "verbose", 0 };
 691     std::string values[1];
 692     values[0] = "0";
 693     mp::xml::parse_attr(ptr, names, values);
 694
 695     phase.m_verbose = atoi(values[0].c_str());
 696
 697     std::map<std::string, RulePtr > rules;
 698     for (ptr = ptr->children; ptr; ptr = ptr->next)
 699     {
 700         if (ptr->type != XML_ELEMENT_NODE)
 701             continue;
 702         else if (!strcmp((const char *) ptr->name, "rule"))
 703         {
 704             static const char *names[2] = { "name", 0 };
 705             std::string values[1];
 706             values[0] = "default";
 707             mp::xml::parse_attr(ptr, names, values);
 708
 709             RulePtr rule(new Rule);
 710             for (xmlNode *p = ptr->children; p; p = p->next)
 711             {
 712                 if (p->type != XML_ELEMENT_NODE)
 713                     continue;
 714                 if (!strcmp((const char *) p->name, "rewrite"))
 715                 {
 716                     Replace replace;
 717                     std::string from;
 718                     const struct _xmlAttr *attr;
 719                     for (attr = p->properties; attr; attr = attr->next)
 720                     {
 721                         if (!strcmp((const char *) attr->name,  "from"))
 722                             from = mp::xml::get_text(attr->children);
 723                         else if (!strcmp((const char *) attr->name,  "to"))
 724                             replace.recipe = mp::xml::get_text(attr->children);
 725                         else
 726                             throw mp::filter::FilterException
 727                                 ("Bad attribute "
 728                                  + std::string((const char *) attr->name)
 729                                  + " in rewrite section of http_rewrite");
 730                     }
 731                     yaz_log(YLOG_LOG, "Found rewrite rule from '%s' to '%s'",
 732                             from.c_str(), replace.recipe.c_str());
 733                     if (!from.empty())
 734                     {
 735                         replace.parse_groups(from);
 736                         rule->replace_list.push_back(replace);
 737                     }
 738                 }
 739                 else
 740                     throw mp::filter::FilterException
 741                         ("Bad element "
 742                          + std::string((const char *) p->name)
 743                          + " in http_rewrite filter");
 744             }
 745             rules[values[0]] = rule;
 746         }
 747         else if (!strcmp((const char *) ptr->name, "content"))
 748         {
 749             static const char *names[3] =
 750                 { "type", "mime", 0 };
 751             std::string values[2];
 752             mp::xml::parse_attr(ptr, names, values);
 753             if (values[0].empty())
 754             {
 755                     throw mp::filter::FilterException
 756                         ("Missing attribute, type for for element "
 757                          + std::string((const char *) ptr->name)
 758                          + " in http_rewrite filter");
 759             }
 760             Content c;
 761
 762             c.type = values[0];
 763             // if (!values[1].empty())
 764                 c.content_re = values[1];
 765             c.configure(ptr->children, rules);
 766             phase.content_list.push_back(c);
 767         }
 768         else
 769         {
 770             throw mp::filter::FilterException
 771                 ("Bad element "
 772                  + std::string((const char *) ptr->name)
 773                  + " in http_rewrite filter");
 774         }
 775     }
 776 }
 777
 778 void yf::HttpRewrite::configure(const xmlNode * ptr, bool test_only,
 779         const char *path)
 780 {
 781     for (ptr = ptr->children; ptr; ptr = ptr->next)
 782     {
 783         if (ptr->type != XML_ELEMENT_NODE)
 784             continue;
 785         else if (!strcmp((const char *) ptr->name, "request"))
 786         {
 787             configure_phase(ptr, *req_phase);
 788         }
 789         else if (!strcmp((const char *) ptr->name, "response"))
 790         {
 791             configure_phase(ptr, *res_phase);
 792         }
 793         else
 794         {
 795             throw mp::filter::FilterException
 796                 ("Bad element "
 797                  + std::string((const char *) ptr->name)
 798                  + " in http_rewrite1 filter");
 799         }
 800     }
 801 }
 802
 803 static mp::filter::Base* filter_creator()
 804 {
 805     return new mp::filter::HttpRewrite;
 806 }
 807
 808 extern "C" {
 809     struct metaproxy_1_filter_struct metaproxy_1_filter_http_rewrite = {
 810         0,
 811         "http_rewrite",
 812         filter_creator
 813     };
 814 }
 815
 816
 817 /*
 818  * Local variables:
 819  * c-basic-offset: 4
 820  * c-file-style: "Stroustrup"
 821  * indent-tabs-mode: nil
 822  * End:
 823  * vim: shiftwidth=4 tabstop=8 expandtab
 824  */
 825