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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"
namespace nghttp2 {
ParserData::ParserData(const std::string &base_uri)
: base_uri(base_uri), inside_head(0) {}
HtmlParser::HtmlParser(const std::string &base_uri)
: base_uri_(base_uri), parser_ctx_(nullptr), parser_data_(base_uri) {}
HtmlParser::~HtmlParser() { htmlFreeParserCtxt(parser_ctx_); }
namespace {
StringRef get_attr(const xmlChar **attrs, const StringRef &name) {
if (attrs == nullptr) {
return StringRef{};
}
for (; *attrs; attrs += 2) {
if (util::strieq(StringRef{attrs[0], strlen(reinterpret_cast<const char *>(
attrs[0]))},
name)) {
return StringRef{attrs[1],
strlen(reinterpret_cast<const char *>(attrs[1]))};
}
}
return StringRef{};
}
} // namespace
namespace {
ResourceType
get_resource_type_for_preload_as(const StringRef &attribute_value) {
if (util::strieq("image"_sr, attribute_value)) {
return REQ_IMG;
} else if (util::strieq("style"_sr, attribute_value)) {
return REQ_CSS;
} else if (util::strieq("script"_sr, attribute_value)) {
return REQ_UNBLOCK_JS;
} else {
return REQ_OTHERS;
}
}
} // namespace
namespace {
void add_link(ParserData *parser_data, const StringRef &uri,
ResourceType res_type) {
auto u = xmlBuildURI(
reinterpret_cast<const xmlChar *>(uri.data()),
reinterpret_cast<const xmlChar *>(parser_data->base_uri.c_str()));
if (u) {
parser_data->links.push_back(
std::make_pair(reinterpret_cast<char *>(u), res_type));
free(u);
}
}
} // namespace
namespace {
void start_element_func(void *user_data, const xmlChar *src_name,
const xmlChar **attrs) {
auto parser_data = static_cast<ParserData *>(user_data);
auto name =
StringRef{src_name, strlen(reinterpret_cast<const char *>(src_name))};
if (util::strieq("head"_sr, name)) {
++parser_data->inside_head;
}
if (util::strieq("link"_sr, name)) {
auto rel_attr = get_attr(attrs, "rel"_sr);
auto href_attr = get_attr(attrs, "href"_sr);
if (rel_attr.empty() || href_attr.empty()) {
return;
}
if (util::strieq("shortcut icon"_sr, rel_attr)) {
add_link(parser_data, href_attr, REQ_OTHERS);
} else if (util::strieq("stylesheet"_sr, rel_attr)) {
add_link(parser_data, href_attr, REQ_CSS);
} else if (util::strieq("preload"_sr, rel_attr)) {
auto as_attr = get_attr(attrs, "as"_sr);
if (as_attr.empty()) {
return;
}
add_link(parser_data, href_attr,
get_resource_type_for_preload_as(as_attr));
}
} else if (util::strieq("img"_sr, name)) {
auto src_attr = get_attr(attrs, "src"_sr);
if (src_attr.empty()) {
return;
}
add_link(parser_data, src_attr, REQ_IMG);
} else if (util::strieq("script"_sr, name)) {
auto src_attr = get_attr(attrs, "src"_sr);
if (src_attr.empty()) {
return;
}
if (parser_data->inside_head) {
add_link(parser_data, src_attr, REQ_JS);
} else {
add_link(parser_data, src_attr, REQ_UNBLOCK_JS);
}
}
}
} // namespace
namespace {
void end_element_func(void *user_data, const xmlChar *name) {
auto parser_data = static_cast<ParserData *>(user_data);
if (util::strieq(
"head"_sr,
StringRef{name, strlen(reinterpret_cast<const char *>(name))})) {
--parser_data->inside_head;
}
}
} // namespace
namespace {
xmlSAXHandler saxHandler = {
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
&end_element_func, // 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) {
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, ResourceType>> &
HtmlParser::get_links() const {
return parser_data_.links;
}
void HtmlParser::clear_links() { parser_data_.links.clear(); }
} // namespace nghttp2
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