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