nghttp2/src/HtmlParser.cc

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/*
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* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "HtmlParser.h"
#include <libxml/uri.h>
#include "util.h"
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namespace nghttp2 {
ParserData::ParserData(const std::string& base_uri)
: base_uri(base_uri)
{}
HtmlParser::HtmlParser(const std::string& base_uri)
: base_uri_(base_uri),
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parser_ctx_(nullptr),
parser_data_(base_uri)
{}
HtmlParser::~HtmlParser()
{
htmlFreeParserCtxt(parser_ctx_);
}
namespace {
const char* get_attr(const xmlChar **attrs, const char *name)
{
if(attrs == nullptr) {
return nullptr;
}
for(; *attrs; attrs += 2) {
if(util::strieq(reinterpret_cast<const char*>(attrs[0]), name)) {
return reinterpret_cast<const char*>(attrs[1]);
}
}
return nullptr;
}
} // namespace
namespace {
void add_link(ParserData *parser_data, const char *uri, RequestPriority pri)
{
auto u = xmlBuildURI(reinterpret_cast<const xmlChar*>(uri),
reinterpret_cast<const xmlChar*>
(parser_data->base_uri.c_str()));
if(u) {
parser_data->links.push_back(std::make_pair(reinterpret_cast<char*>(u),
pri));
free(u);
}
}
} // namespace
namespace {
void start_element_func
(void* user_data,
const xmlChar *name,
const xmlChar **attrs)
{
auto parser_data = static_cast<ParserData*>(user_data);
if(util::strieq(reinterpret_cast<const char*>(name), "link")) {
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auto rel_attr = get_attr(attrs, "rel");
auto href_attr = get_attr(attrs, "href");
if(!href_attr) {
return;
}
if(util::strieq(rel_attr, "shortcut icon")) {
add_link(parser_data, href_attr, REQ_PRI_LOWEST);
} else if(util::strieq(rel_attr, "stylesheet")) {
add_link(parser_data, href_attr, REQ_PRI_MEDIUM);
}
} else if(util::strieq(reinterpret_cast<const char*>(name), "img")) {
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auto src_attr = get_attr(attrs, "src");
if(!src_attr) {
return;
}
add_link(parser_data, src_attr, REQ_PRI_LOWEST);
} else if(util::strieq(reinterpret_cast<const char*>(name), "script")) {
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auto src_attr = get_attr(attrs, "src");
if(!src_attr) {
return;
}
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add_link(parser_data, src_attr, REQ_PRI_LOW);
}
}
} // namespace
namespace {
xmlSAXHandler saxHandler =
{
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nullptr, // internalSubsetSAXFunc
nullptr, // isStandaloneSAXFunc
nullptr, // hasInternalSubsetSAXFunc
nullptr, // hasExternalSubsetSAXFunc
nullptr, // resolveEntitySAXFunc
nullptr, // getEntitySAXFunc
nullptr, // entityDeclSAXFunc
nullptr, // notationDeclSAXFunc
nullptr, // attributeDeclSAXFunc
nullptr, // elementDeclSAXFunc
nullptr, // unparsedEntityDeclSAXFunc
nullptr, // setDocumentLocatorSAXFunc
nullptr, // startDocumentSAXFunc
nullptr, // endDocumentSAXFunc
&start_element_func, // startElementSAXFunc
nullptr, // endElementSAXFunc
nullptr, // referenceSAXFunc
nullptr, // charactersSAXFunc
nullptr, // ignorableWhitespaceSAXFunc
nullptr, // processingInstructionSAXFunc
nullptr, // commentSAXFunc
nullptr, // warningSAXFunc
nullptr, // errorSAXFunc
nullptr, // fatalErrorSAXFunc
nullptr, // getParameterEntitySAXFunc
nullptr, // cdataBlockSAXFunc
nullptr, // externalSubsetSAXFunc
0, // unsigned int initialized
nullptr, // void * _private
nullptr, // startElementNsSAX2Func
nullptr, // endElementNsSAX2Func
nullptr, // xmlStructuredErrorFunc
};
} // namespace
int HtmlParser::parse_chunk(const char *chunk, size_t size, int fin)
{
if(!parser_ctx_) {
parser_ctx_ = htmlCreatePushParserCtxt(&saxHandler,
&parser_data_,
chunk, size,
base_uri_.c_str(),
XML_CHAR_ENCODING_NONE);
if(!parser_ctx_) {
return -1;
} else {
if(fin) {
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return parse_chunk_internal(nullptr, 0, fin);
} else {
return 0;
}
}
} else {
return parse_chunk_internal(chunk, size, fin);
}
}
int HtmlParser::parse_chunk_internal(const char *chunk, size_t size,
int fin)
{
int rv = htmlParseChunk(parser_ctx_, chunk, size, fin);
if(rv == 0) {
return 0;
} else {
return -1;
}
}
const std::vector<std::pair<std::string, RequestPriority>>&
HtmlParser::get_links() const
{
return parser_data_.links;
}
void HtmlParser::clear_links()
{
parser_data_.links.clear();
}
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} // namespace nghttp2