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/*
* 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.
*/
#ifndef TALK_BASE_HTTPCLIENT_H__
#define TALK_BASE_HTTPCLIENT_H__
#include "talk/base/common.h"
#include "talk/base/httpbase.h"
#include "talk/base/nethelpers.h"
#include "talk/base/proxyinfo.h"
#include "talk/base/scoped_ptr.h"
#include "talk/base/sigslot.h"
#include "talk/base/socketaddress.h"
#include "talk/base/socketpool.h"
namespace talk_base {
//////////////////////////////////////////////////////////////////////
// Client-specific http utilities
//////////////////////////////////////////////////////////////////////
// Write cache-relevant response headers to output stream. If size is non-null,
// it contains the length of the output in bytes. output may be null if only
// the length is desired.
bool HttpWriteCacheHeaders(const HttpResponseData* response,
StreamInterface* output, size_t* size);
// Read cached headers from a stream, and them merge them into the response
// object using the specified combine operation.
bool HttpReadCacheHeaders(StreamInterface* input,
HttpResponseData* response,
HttpData::HeaderCombine combine);
//////////////////////////////////////////////////////////////////////
// HttpClient
// Implements an HTTP 1.1 client.
//////////////////////////////////////////////////////////////////////
class DiskCache;
class HttpClient;
class IPNetPool;
class SignalThread;
// What to do: Define STRICT_HTTP_ERROR=1 in your makefile. Use HttpError in
// your code (HttpErrorType should only be used for code that is shared
// with groups which have not yet migrated).
#if STRICT_HTTP_ERROR
typedef HttpError HttpErrorType;
#else // !STRICT_HTTP_ERROR
typedef int HttpErrorType;
#endif // !STRICT_HTTP_ERROR
class HttpClient : private IHttpNotify, public sigslot::has_slots<> {
public:
// If HttpRequestData and HttpResponseData objects are provided, they must
// be freed by the caller. Otherwise, an internal object is allocated.
HttpClient(const std::string& agent, StreamPool* pool,
HttpTransaction* transaction = NULL);
virtual ~HttpClient();
void set_pool(StreamPool* pool) { pool_ = pool; }
void set_agent(const std::string& agent) { agent_ = agent; }
const std::string& agent() const { return agent_; }
void set_proxy(const ProxyInfo& proxy) { proxy_ = proxy; }
const ProxyInfo& proxy() const { return proxy_; }
// Request retries occur when the connection closes before the beginning of
// an http response is received. In these cases, the http server may have
// timed out the keepalive connection before it received our request. Note
// that if a request document cannot be rewound, no retry is made. The
// default is 1.
void set_request_retries(size_t retries) { retries_ = retries; }
size_t request_retries() const { return retries_; }
enum RedirectAction { REDIRECT_DEFAULT, REDIRECT_ALWAYS, REDIRECT_NEVER };
void set_redirect_action(RedirectAction action) { redirect_action_ = action; }
RedirectAction redirect_action() const { return redirect_action_; }
// Deprecated
void set_fail_redirect(bool fail_redirect) {
redirect_action_ = REDIRECT_NEVER;
}
bool fail_redirect() const { return (REDIRECT_NEVER == redirect_action_); }
enum UriForm { URI_DEFAULT, URI_ABSOLUTE, URI_RELATIVE };
void set_uri_form(UriForm form) { uri_form_ = form; }
UriForm uri_form() const { return uri_form_; }
void set_cache(DiskCache* cache) { ASSERT(!IsCacheActive()); cache_ = cache; }
bool cache_enabled() const { return (NULL != cache_); }
// reset clears the server, request, and response structures. It will also
// abort an active request.
void reset();
void set_server(const SocketAddress& address);
const SocketAddress& server() const { return server_; }
// Note: in order for HttpClient to retry a POST in response to
// an authentication challenge, a redirect response, or socket disconnection,
// the request document must support 'replaying' by calling Rewind() on it.
// In the case where just a subset of a stream should be used as the request
// document, the stream may be wrapped with the StreamSegment adapter.
HttpTransaction* transaction() { return transaction_; }
const HttpTransaction* transaction() const { return transaction_; }
HttpRequestData& request() { return transaction_->request; }
const HttpRequestData& request() const { return transaction_->request; }
HttpResponseData& response() { return transaction_->response; }
const HttpResponseData& response() const { return transaction_->response; }
// convenience methods
void prepare_get(const std::string& url);
void prepare_post(const std::string& url, const std::string& content_type,
StreamInterface* request_doc);
// Convert HttpClient to a pull-based I/O model.
StreamInterface* GetDocumentStream();
// After you finish setting up your request, call start.
void start();
// Signalled when the header has finished downloading, before the document
// content is processed. You may change the response document in response
// to this signal. The second parameter indicates whether this is an
// intermediate (false) or final (true) header. An intermediate header is
// one that generates another request, such as a redirect or authentication
// challenge. The third parameter indicates the length of the response
// document, or else SIZE_UNKNOWN. Note: Do NOT abort the request in response
// to this signal.
sigslot::signal3<HttpClient*,bool,size_t> SignalHeaderAvailable;
// Signalled when the current request finishes. On success, err is 0.
sigslot::signal2<HttpClient*,HttpErrorType> SignalHttpClientComplete;
protected:
void connect();
void release();
bool ShouldRedirect(std::string* location) const;
bool BeginCacheFile();
HttpError WriteCacheHeaders(const std::string& id);
void CompleteCacheFile();
bool CheckCache();
HttpError ReadCacheHeaders(const std::string& id, bool override);
HttpError ReadCacheBody(const std::string& id);
bool PrepareValidate();
HttpError CompleteValidate();
HttpError OnHeaderAvailable(bool ignore_data, bool chunked, size_t data_size);
void StartDNSLookup();
void OnResolveResult(AsyncResolverInterface* resolver);
// IHttpNotify Interface
virtual HttpError onHttpHeaderComplete(bool chunked, size_t& data_size);
virtual void onHttpComplete(HttpMode mode, HttpError err);
virtual void onHttpClosed(HttpError err);
private:
enum CacheState { CS_READY, CS_WRITING, CS_READING, CS_VALIDATING };
bool IsCacheActive() const { return (cache_state_ > CS_READY); }
std::string agent_;
StreamPool* pool_;
HttpBase base_;
SocketAddress server_;
ProxyInfo proxy_;
HttpTransaction* transaction_;
bool free_transaction_;
size_t retries_, attempt_, redirects_;
RedirectAction redirect_action_;
UriForm uri_form_;
scoped_ptr<HttpAuthContext> context_;
DiskCache* cache_;
CacheState cache_state_;
AsyncResolverInterface* resolver_;
};
//////////////////////////////////////////////////////////////////////
// HttpClientDefault - Default implementation of HttpClient
//////////////////////////////////////////////////////////////////////
class HttpClientDefault : public ReuseSocketPool, public HttpClient {
public:
HttpClientDefault(SocketFactory* factory, const std::string& agent,
HttpTransaction* transaction = NULL);
};
//////////////////////////////////////////////////////////////////////
} // namespace talk_base
#endif // TALK_BASE_HTTPCLIENT_H__
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