nghttp2/src/asio_server_serve_mux.cc

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2015 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 "asio_server_serve_mux.h"
#include "asio_server_request_impl.h"
#include "asio_server_request_handler.h"
#include "util.h"
#include "http2.h"
namespace nghttp2 {
namespace asio_http2 {
namespace server {
bool serve_mux::handle(std::string pattern, request_cb cb) {
if (pattern.empty() || !cb) {
return false;
}
auto it = mux_.find(pattern);
if (it != std::end(mux_) && (*it).second.user_defined) {
return false;
}
// if pattern ends with '/' (e.g., /foo/), add implicit permanent
// redirect for '/foo'.
if (pattern.size() >= 2 && pattern.back() == '/') {
auto redirect_pattern = pattern.substr(0, pattern.size() - 1);
auto it = mux_.find(redirect_pattern);
if (it == std::end(mux_) || !(*it).second.user_defined) {
std::string path;
if (pattern[0] == '/') {
path = pattern;
} else {
// skip host part
path = pattern.substr(pattern.find('/'));
}
if (it == std::end(mux_)) {
mux_.emplace(std::move(redirect_pattern),
handler_entry{false,
redirect_handler(301, std::move(path)),
pattern});
} else {
(*it).second = handler_entry{
false, redirect_handler(301, std::move(path)), pattern};
}
}
}
mux_.emplace(pattern, handler_entry{true, std::move(cb), pattern});
return true;
}
request_cb serve_mux::handler(request_impl &req) const {
auto &path = req.uri().path;
if (req.method() != "CONNECT") {
auto clean_path = ::nghttp2::http2::path_join(StringRef{}, StringRef{},
StringRef{path}, StringRef{});
if (clean_path != path) {
auto new_uri = util::percent_encode_path(clean_path);
auto &uref = req.uri();
if (!uref.raw_query.empty()) {
new_uri += '?';
new_uri += uref.raw_query;
}
return redirect_handler(301, std::move(new_uri));
}
}
auto &host = req.uri().host;
auto cb = match(host + path);
if (cb) {
return cb;
}
cb = match(path);
if (cb) {
return cb;
}
return status_handler(404);
}
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namespace {
bool path_match(const std::string &pattern, const std::string &path) {
if (pattern.back() != '/') {
return pattern == path;
}
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return util::starts_with(path, pattern);
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}
} // namespace
request_cb serve_mux::match(const std::string &path) const {
const handler_entry *ent = nullptr;
size_t best = 0;
for (auto &kv : mux_) {
auto &pattern = kv.first;
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if (!path_match(pattern, path)) {
continue;
}
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if (!ent || best < pattern.size()) {
best = pattern.size();
ent = &kv.second;
}
}
if (ent) {
return ent->cb;
}
return request_cb();
}
} // namespace server
} // namespace asio_http2
} // namespace nghttp2