diff options
Diffstat (limited to 'third_party/libjingle/files/talk/base/httpclient.cc')
| -rw-r--r-- | third_party/libjingle/files/talk/base/httpclient.cc | 716 |
1 files changed, 0 insertions, 716 deletions
diff --git a/third_party/libjingle/files/talk/base/httpclient.cc b/third_party/libjingle/files/talk/base/httpclient.cc deleted file mode 100644 index b833007..0000000 --- a/third_party/libjingle/files/talk/base/httpclient.cc +++ /dev/null @@ -1,716 +0,0 @@ -/* - * libjingle - * Copyright 2004--2005, Google Inc. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO - * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; - * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR - * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF - * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <time.h> - -#include "talk/base/httpcommon-inl.h" - -#include "talk/base/asyncsocket.h" -#include "talk/base/common.h" -#include "talk/base/diskcache.h" -#include "talk/base/httpclient.h" -#include "talk/base/logging.h" -#include "talk/base/pathutils.h" -#include "talk/base/socketstream.h" -#include "talk/base/stringencode.h" -#include "talk/base/stringutils.h" -#include "talk/base/basicdefs.h" - -namespace talk_base { - -////////////////////////////////////////////////////////////////////// -// Helpers -////////////////////////////////////////////////////////////////////// - -namespace { - -const size_t kCacheHeader = 0; -const size_t kCacheBody = 1; - -std::string HttpAddress(const SocketAddress& address) { - return (address.port() == HTTP_DEFAULT_PORT) - ? address.hostname() : address.ToString(); -} - -// Convert decimal string to integer -bool HttpStringToInt(const std::string& str, unsigned long* val) { - ASSERT(NULL != val); - char* eos = NULL; - *val = strtoul(str.c_str(), &eos, 10); - return (*eos == '\0'); -} - -bool HttpShouldCache(const HttpRequestData& request, - const HttpResponseData& response) { - bool verb_allows_cache = (request.verb == HV_GET) - || (request.verb == HV_HEAD); - bool is_range_response = response.hasHeader(HH_CONTENT_RANGE, NULL); - bool has_expires = response.hasHeader(HH_EXPIRES, NULL); - bool request_allows_cache = - has_expires || (std::string::npos != request.path.find('?')); - bool response_allows_cache = - has_expires || HttpCodeIsCacheable(response.scode); - - bool may_cache = verb_allows_cache - && request_allows_cache - && response_allows_cache - && !is_range_response; - - std::string value; - if (response.hasHeader(HH_CACHE_CONTROL, &value)) { - HttpAttributeList directives; - HttpParseAttributes(value.data(), value.size(), directives); - // Response Directives Summary: - // public - always cacheable - // private - do not cache in a shared cache - // no-cache - may cache, but must revalidate whether fresh or stale - // no-store - sensitive information, do not cache or store in any way - // max-age - supplants Expires for staleness - // s-maxage - use as max-age for shared caches, ignore otherwise - // must-revalidate - may cache, but must revalidate after stale - // proxy-revalidate - shared cache must revalidate - if (HttpHasAttribute(directives, "no-store", NULL)) { - may_cache = false; - } else if (HttpHasAttribute(directives, "public", NULL)) { - may_cache = true; - } - } - return may_cache; -} - -enum HttpCacheState { - HCS_FRESH, // In cache, may use - HCS_STALE, // In cache, must revalidate - HCS_NONE // Not in cache -}; - -HttpCacheState HttpGetCacheState(const HttpRequestData& request, - const HttpResponseData& response) { - // Temporaries - std::string s_temp; - unsigned long i_temp; - - // Current time - unsigned long now = time(0); - - HttpAttributeList cache_control; - if (response.hasHeader(HH_CACHE_CONTROL, &s_temp)) { - HttpParseAttributes(s_temp.data(), s_temp.size(), cache_control); - } - - // Compute age of cache document - unsigned long date; - if (!response.hasHeader(HH_DATE, &s_temp) - || !HttpDateToSeconds(s_temp, &date)) - return HCS_NONE; - - // TODO: Timestamp when cache request sent and response received? - unsigned long request_time = date; - unsigned long response_time = date; - - unsigned long apparent_age = 0; - if (response_time > date) { - apparent_age = response_time - date; - } - - unsigned long corrected_received_age = apparent_age; - if (response.hasHeader(HH_AGE, &s_temp) - && HttpStringToInt(s_temp, &i_temp)) { - corrected_received_age = stdmax(apparent_age, i_temp); - } - - unsigned long response_delay = response_time - request_time; - unsigned long corrected_initial_age = corrected_received_age + response_delay; - unsigned long resident_time = now - response_time; - unsigned long current_age = corrected_initial_age + resident_time; - - // Compute lifetime of document - unsigned long lifetime; - if (HttpHasAttribute(cache_control, "max-age", &s_temp)) { - lifetime = atoi(s_temp.c_str()); - } else if (response.hasHeader(HH_EXPIRES, &s_temp) - && HttpDateToSeconds(s_temp, &i_temp)) { - lifetime = i_temp - date; - } else if (response.hasHeader(HH_LAST_MODIFIED, &s_temp) - && HttpDateToSeconds(s_temp, &i_temp)) { - // TODO: Issue warning 113 if age > 24 hours - lifetime = (now - i_temp) / 10; - } else { - return HCS_STALE; - } - - return (lifetime > current_age) ? HCS_FRESH : HCS_STALE; -} - -enum HttpValidatorStrength { - HVS_NONE, - HVS_WEAK, - HVS_STRONG -}; - -HttpValidatorStrength -HttpRequestValidatorLevel(const HttpRequestData& request) { - if (HV_GET != request.verb) - return HVS_STRONG; - return request.hasHeader(HH_RANGE, NULL) ? HVS_STRONG : HVS_WEAK; -} - -HttpValidatorStrength -HttpResponseValidatorLevel(const HttpResponseData& response) { - std::string value; - if (response.hasHeader(HH_ETAG, &value)) { - bool is_weak = (strnicmp(value.c_str(), "W/", 2) == 0); - return is_weak ? HVS_WEAK : HVS_STRONG; - } - if (response.hasHeader(HH_LAST_MODIFIED, &value)) { - unsigned long last_modified, date; - if (HttpDateToSeconds(value, &last_modified) - && response.hasHeader(HH_DATE, &value) - && HttpDateToSeconds(value, &date) - && (last_modified + 60 < date)) { - return HVS_STRONG; - } - return HVS_WEAK; - } - return HVS_NONE; -} - -std::string GetCacheID(const SocketAddress& server, - const HttpRequestData& request) { - std::string url; - url.append(ToString(request.verb)); - url.append("_"); - if ((_strnicmp(request.path.c_str(), "http://", 7) == 0) - || (_strnicmp(request.path.c_str(), "https://", 8) == 0)) { - url.append(request.path); - } else { - url.append("http://"); - url.append(HttpAddress(server)); - url.append(request.path); - } - return url; -} - -} // anonymous namespace - -////////////////////////////////////////////////////////////////////// -// HttpClient -////////////////////////////////////////////////////////////////////// - -HttpClient::HttpClient(const std::string& agent, StreamPool* pool) -: agent_(agent), pool_(pool), fail_redirect_(false), absolute_uri_(false), - cache_(NULL), cache_state_(CS_READY) -{ - base_.notify(this); -} - -HttpClient::~HttpClient() { - base_.notify(NULL); - base_.abort(HE_SHUTDOWN); - release(); -} - -void HttpClient::reset() { - server_.Clear(); - request_.clear(true); - response_.clear(true); - context_.reset(); - base_.abort(HE_OPERATION_CANCELLED); -} - -void HttpClient::set_server(const SocketAddress& address) { - server_ = address; - // Setting 'Host' here allows it to be overridden before starting the request, - // if necessary. - request_.setHeader(HH_HOST, HttpAddress(server_), true); -} - -void HttpClient::start() { - if (base_.mode() != HM_NONE) { - // call reset() to abort an in-progress request - ASSERT(false); - return; - } - - ASSERT(!IsCacheActive()); - - if (request_.hasHeader(HH_TRANSFER_ENCODING, NULL)) { - // Exact size must be known on the client. Instead of using chunked - // encoding, wrap data with auto-caching file or memory stream. - ASSERT(false); - return; - } - - // If no content has been specified, using length of 0. - request_.setHeader(HH_CONTENT_LENGTH, "0", false); - - request_.setHeader(HH_USER_AGENT, agent_, false); - request_.setHeader(HH_CONNECTION, "Keep-Alive", false); - if (_strnicmp(request_.path.c_str(), "http", 4) == 0) { - request_.setHeader(HH_PROXY_CONNECTION, "Keep-Alive", false); - } - - bool absolute_uri = absolute_uri_; - if (PROXY_HTTPS == proxy_.type) { - request().version = HVER_1_0; - // Proxies require canonical form - absolute_uri = true; - } - - // Convert to canonical form (if not already) - if (absolute_uri && (_strnicmp(request().path.c_str(), "http://", 7) != 0)) { - std::string canonical_path("http://"); - canonical_path.append(HttpAddress(server_)); - canonical_path.append(request().path); - request().path = canonical_path; - } - - if ((NULL != cache_) && CheckCache()) { - return; - } - - int stream_err; - StreamInterface* stream = pool_->RequestConnectedStream(server_, &stream_err); - if (stream == NULL) { - if (stream_err) - LOG(LS_ERROR) << "RequestConnectedStream returned: " << stream_err; - onHttpComplete(HM_CONNECT, (stream_err == 0) ? HE_NONE : HE_SOCKET); - } else { - base_.attach(stream); - if (stream->GetState() == SS_OPEN) { - base_.send(&request_); - } - } -} - -void HttpClient::prepare_get(const std::string& url) { - reset(); - Url<char> purl(url); - set_server(SocketAddress(purl.server(), purl.port(), false)); - request().verb = HV_GET; - request().path = purl.full_path(); -} - -void HttpClient::prepare_post(const std::string& url, - const std::string& content_type, - StreamInterface* request_doc) { - reset(); - Url<char> purl(url); - set_server(SocketAddress(purl.server(), purl.port(), false)); - request().verb = HV_POST; - request().path = purl.full_path(); - request().setContent(content_type, request_doc); -} - -void HttpClient::release() { - if (StreamInterface* stream = base_.detach()) { - pool_->ReturnConnectedStream(stream); - } -} - -bool HttpClient::BeginCacheFile() { - ASSERT(NULL != cache_); - ASSERT(CS_READY == cache_state_); - - std::string id = GetCacheID(server_, request_); - CacheLock lock(cache_, id, true); - if (!lock.IsLocked()) { - LOG_F(LS_WARNING) << "Couldn't lock cache"; - return false; - } - - if (HE_NONE != WriteCacheHeaders(id)) { - return false; - } - - scoped_ptr<StreamInterface> stream(cache_->WriteResource(id, kCacheBody)); - if (!stream.get()) { - LOG_F(LS_ERROR) << "Couldn't open body cache"; - return false; - } - lock.Commit(); - - // Let's secretly replace the response document with Folgers Crystals, - // er, StreamTap, so that we can mirror the data to our cache. - StreamInterface* output = response_.document.release(); - if (!output) { - output = new NullStream; - } - StreamTap* tap = new StreamTap(output, stream.release()); - response_.document.reset(tap); - return true; -} - -HttpError HttpClient::WriteCacheHeaders(const std::string& id) { - scoped_ptr<StreamInterface> stream(cache_->WriteResource(id, kCacheHeader)); - if (!stream.get()) { - LOG_F(LS_ERROR) << "Couldn't open header cache"; - return HE_CACHE; - } - - // Write all unknown and end-to-end headers to a cache file - for (HttpData::const_iterator it = response_.begin(); - it != response_.end(); ++it) { - HttpHeader header; - if (FromString(header, it->first) && !HttpHeaderIsEndToEnd(header)) - continue; - std::string formatted_header(it->first); - formatted_header.append(": "); - formatted_header.append(it->second); - formatted_header.append("\r\n"); - StreamResult result = stream->WriteAll(formatted_header.data(), - formatted_header.length(), - NULL, NULL); - if (SR_SUCCESS != result) { - LOG_F(LS_ERROR) << "Couldn't write header cache"; - return HE_CACHE; - } - } - - return HE_NONE; -} - -void HttpClient::CompleteCacheFile() { - // Restore previous response document - StreamTap* tap = static_cast<StreamTap*>(response_.document.release()); - response_.document.reset(tap->Detach()); - - int error; - StreamResult result = tap->GetTapResult(&error); - - // Delete the tap and cache stream (which completes cache unlock) - delete tap; - - if (SR_SUCCESS != result) { - LOG(LS_ERROR) << "Cache file error: " << error; - cache_->DeleteResource(GetCacheID(server_, request_)); - } -} - -bool HttpClient::CheckCache() { - ASSERT(NULL != cache_); - ASSERT(CS_READY == cache_state_); - - std::string id = GetCacheID(server_, request_); - if (!cache_->HasResource(id)) { - // No cache file available - return false; - } - - HttpError error = ReadCacheHeaders(id, true); - - if (HE_NONE == error) { - switch (HttpGetCacheState(request_, response_)) { - case HCS_FRESH: - // Cache content is good, read from cache - break; - case HCS_STALE: - // Cache content may be acceptable. Issue a validation request. - if (PrepareValidate()) { - return false; - } - // Couldn't validate, fall through. - case HCS_NONE: - // Cache content is not useable. Issue a regular request. - response_.clear(false); - return false; - } - } - - if (HE_NONE == error) { - error = ReadCacheBody(id); - cache_state_ = CS_READY; - } - - if (HE_CACHE == error) { - LOG_F(LS_WARNING) << "Cache failure, continuing with normal request"; - response_.clear(false); - return false; - } - - SignalHttpClientComplete(this, error); - return true; -} - -HttpError HttpClient::ReadCacheHeaders(const std::string& id, bool override) { - scoped_ptr<StreamInterface> stream(cache_->ReadResource(id, kCacheHeader)); - if (!stream.get()) { - return HE_CACHE; - } - - HttpData::HeaderCombine combine = - override ? HttpData::HC_REPLACE : HttpData::HC_AUTO; - - while (true) { - std::string formatted_header; - StreamResult result = stream->ReadLine(&formatted_header); - if (SR_EOS == result) - break; - - if (SR_SUCCESS != result) { - LOG_F(LS_ERROR) << "ReadLine error in cache headers"; - return HE_CACHE; - } - size_t end_of_name = formatted_header.find(':'); - if (std::string::npos == end_of_name) { - LOG_F(LS_WARNING) << "Malformed cache header"; - continue; - } - size_t start_of_value = end_of_name + 1; - size_t end_of_value = formatted_header.length(); - while ((start_of_value < end_of_value) - && isspace(formatted_header[start_of_value])) - ++start_of_value; - while ((start_of_value < end_of_value) - && isspace(formatted_header[end_of_value-1])) - --end_of_value; - size_t value_length = end_of_value - start_of_value; - - std::string name(formatted_header.substr(0, end_of_name)); - std::string value(formatted_header.substr(start_of_value, value_length)); - response_.changeHeader(name, value, combine); - } - - response_.scode = HC_OK; - return HE_NONE; -} - -HttpError HttpClient::ReadCacheBody(const std::string& id) { - cache_state_ = CS_READING; - - HttpError error = HE_NONE; - - size_t data_size; - scoped_ptr<StreamInterface> stream(cache_->ReadResource(id, kCacheBody)); - if (!stream.get() || !stream->GetSize(&data_size)) { - LOG_F(LS_ERROR) << "Unavailable cache body"; - error = HE_CACHE; - } else { - error = OnHeaderAvailable(false, false, data_size); - } - - if ((HE_NONE == error) - && (HV_HEAD != request_.verb) - && (NULL != response_.document.get())) { - char buffer[1024 * 64]; - StreamResult result = Flow(stream.get(), buffer, ARRAY_SIZE(buffer), - response_.document.get()); - if (SR_SUCCESS != result) { - error = HE_STREAM; - } - } - - return error; -} - -bool HttpClient::PrepareValidate() { - ASSERT(CS_READY == cache_state_); - // At this point, request_ contains the pending request, and response_ - // contains the cached response headers. Reformat the request to validate - // the cached content. - HttpValidatorStrength vs_required = HttpRequestValidatorLevel(request_); - HttpValidatorStrength vs_available = HttpResponseValidatorLevel(response_); - if (vs_available < vs_required) { - return false; - } - std::string value; - if (response_.hasHeader(HH_ETAG, &value)) { - request_.addHeader(HH_IF_NONE_MATCH, value); - } - if (response_.hasHeader(HH_LAST_MODIFIED, &value)) { - request_.addHeader(HH_IF_MODIFIED_SINCE, value); - } - response_.clear(false); - cache_state_ = CS_VALIDATING; - return true; -} - -HttpError HttpClient::CompleteValidate() { - ASSERT(CS_VALIDATING == cache_state_); - - std::string id = GetCacheID(server_, request_); - - // Merge cached headers with new headers - HttpError error = ReadCacheHeaders(id, false); - if (HE_NONE != error) { - // Rewrite merged headers to cache - CacheLock lock(cache_, id); - error = WriteCacheHeaders(id); - } - if (HE_NONE != error) { - error = ReadCacheBody(id); - } - return error; -} - -HttpError HttpClient::OnHeaderAvailable(bool ignore_data, bool chunked, - size_t data_size) { - if (!ignore_data && !chunked && response_.document.get()) { - // Attempt to pre-allocate space for the downloaded data. - if (!response_.document->ReserveSize(data_size)) { - return HE_OVERFLOW; - } - } - SignalHeaderAvailable(this, chunked, data_size); - return HE_NONE; -} - -// -// HttpBase Implementation -// - -HttpError HttpClient::onHttpHeaderComplete(bool chunked, size_t& data_size) { - if (CS_VALIDATING == cache_state_) { - if (HC_NOT_MODIFIED == response_.scode) { - return CompleteValidate(); - } - // Should we remove conditional headers from request? - cache_state_ = CS_READY; - cache_->DeleteResource(GetCacheID(server_, request_)); - // Continue processing response as normal - } - - ASSERT(!IsCacheActive()); - if ((request_.verb == HV_HEAD) || !HttpCodeHasBody(response_.scode)) { - // HEAD requests and certain response codes contain no body - data_size = 0; - } - if ((HttpCodeIsRedirection(response_.scode) && !fail_redirect_) - || ((HC_PROXY_AUTHENTICATION_REQUIRED == response_.scode) - && (PROXY_HTTPS == proxy_.type))) { - // We're going to issue another request, so ignore the incoming data. - base_.set_ignore_data(true); - } - - HttpError error = OnHeaderAvailable(base_.ignore_data(), chunked, data_size); - if (HE_NONE != error) { - return error; - } - - if ((NULL != cache_) - && !base_.ignore_data() - && HttpShouldCache(request_, response_)) { - if (BeginCacheFile()) { - cache_state_ = CS_WRITING; - } - } - return HE_NONE; -} - -void HttpClient::onHttpComplete(HttpMode mode, HttpError err) { - if (err != HE_NONE) { - // fall through - } else if (mode == HM_CONNECT) { - base_.send(&request_); - return; - } else if ((mode == HM_SEND) || HttpCodeIsInformational(response_.scode)) { - // If you're interested in informational headers, catch - // SignalHeaderAvailable. - base_.recv(&response_); - return; - } else { - if (!HttpShouldKeepAlive(response_)) { - LOG(INFO) << "HttpClient: closing socket"; - base_.stream()->Close(); - } - if (HttpCodeIsRedirection(response_.scode) && !fail_redirect_) { - std::string value; - if (!response_.hasHeader(HH_LOCATION, &value)) { - err = HE_PROTOCOL; - } else { - Url<char> purl(value); - set_server(SocketAddress(purl.server(), purl.port(), false)); - request_.path = purl.full_path(); - if (response_.scode == HC_SEE_OTHER) { - request_.verb = HV_GET; - request_.clearHeader(HH_CONTENT_TYPE); - request_.clearHeader(HH_CONTENT_LENGTH); - request_.document.reset(); - } else if (request_.document.get() && !request_.document->Rewind()) { - // Unable to replay the request document. - err = HE_STREAM; - } - } - if (err == HE_NONE) { - context_.reset(); - response_.clear(false); - release(); - start(); - return; - } - } else if ((HC_PROXY_AUTHENTICATION_REQUIRED == response_.scode) - && (PROXY_HTTPS == proxy_.type)) { - std::string response, auth_method; - HttpData::const_iterator begin = response_.begin(HH_PROXY_AUTHENTICATE); - HttpData::const_iterator end = response_.end(HH_PROXY_AUTHENTICATE); - for (HttpData::const_iterator it = begin; it != end; ++it) { - HttpAuthContext *context = context_.get(); - HttpAuthResult res = HttpAuthenticate( - it->second.data(), it->second.size(), - proxy_.address, - ToString(request_.verb), request_.path, - proxy_.username, proxy_.password, - context, response, auth_method); - context_.reset(context); - if (res == HAR_RESPONSE) { - request_.setHeader(HH_PROXY_AUTHORIZATION, response); - if (request_.document.get() && !request_.document->Rewind()) { - err = HE_STREAM; - } else { - // Explicitly do not reset the HttpAuthContext - response_.clear(false); - // TODO: Reuse socket when authenticating? - release(); - start(); - return; - } - } else if (res == HAR_IGNORE) { - LOG(INFO) << "Ignoring Proxy-Authenticate: " << auth_method; - continue; - } else { - break; - } - } - } - } - if (CS_WRITING == cache_state_) { - CompleteCacheFile(); - cache_state_ = CS_READY; - } else if (CS_READING == cache_state_) { - cache_state_ = CS_READY; - } - release(); - SignalHttpClientComplete(this, err); -} - -void HttpClient::onHttpClosed(HttpError err) { - SignalHttpClientClosed(this, err); -} - -////////////////////////////////////////////////////////////////////// - -} // namespace talk_base |