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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "components/webp_transcode/webp_network_client.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/mac/bind_objc_block.h"
#include "base/mac/scoped_nsobject.h"
#include "base/sequenced_task_runner.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "base/thread_task_runner_handle.h"
#include "components/webp_transcode/webp_decoder.h"
#include "net/base/net_errors.h"
#include "net/http/http_request_headers.h"
#include "net/url_request/url_request.h"
namespace net {
class URLRequest;
}
using namespace webp_transcode;
namespace {
// MIME type for WebP images.
const char kWebPMimeType[] = "image/webp";
NSString* const kNSWebPMimeType = @"image/webp";
NSURLResponse* NewImageResponse(NSURLResponse* webp_response,
size_t content_length,
WebpDecoder::DecodedImageFormat format) {
DCHECK(webp_response);
NSString* mime_type = nil;
switch (format) {
case WebpDecoder::JPEG:
mime_type = @"image/jpeg";
break;
case WebpDecoder::PNG:
mime_type = @"image/png";
break;
case WebpDecoder::TIFF:
mime_type = @"image/tiff";
break;
case WebpDecoder::DECODED_FORMAT_COUNT:
NOTREACHED();
break;
}
DCHECK(mime_type);
if ([webp_response isKindOfClass:[NSHTTPURLResponse class]]) {
NSHTTPURLResponse* http_response =
static_cast<NSHTTPURLResponse*>(webp_response);
NSMutableDictionary* header_fields = [NSMutableDictionary
dictionaryWithDictionary:[http_response allHeaderFields]];
[header_fields setObject:[NSString stringWithFormat:@"%zu", content_length]
forKey:@"Content-Length"];
[header_fields setObject:mime_type forKey:@"Content-Type"];
return [[NSHTTPURLResponse alloc] initWithURL:[http_response URL]
statusCode:[http_response statusCode]
HTTPVersion:@"HTTP/1.1"
headerFields:header_fields];
} else {
return [[NSURLResponse alloc] initWithURL:[webp_response URL]
MIMEType:mime_type
expectedContentLength:content_length
textEncodingName:[webp_response textEncodingName]];
}
}
class WebpDecoderDelegate : public WebpDecoder::Delegate {
public:
WebpDecoderDelegate(id<CRNNetworkClientProtocol> client,
const base::Time& request_creation_time,
const scoped_refptr<base::TaskRunner>& callback_runner)
: underlying_client_([client retain]),
callback_task_runner_(callback_runner),
request_creation_time_(request_creation_time) {
DCHECK(underlying_client_.get());
}
void SetOriginalResponse(
const base::scoped_nsobject<NSURLResponse>& response) {
original_response_.reset([response retain]);
}
// WebpDecoder::Delegate methods.
void OnFinishedDecoding(bool success) override {
base::scoped_nsprotocol<id<CRNNetworkClientProtocol>> block_client(
[underlying_client_ retain]);
if (success) {
callback_task_runner_->PostTask(FROM_HERE, base::BindBlock(^{
[block_client didFinishLoading];
}));
} else {
DLOG(WARNING) << "WebP decoding failed "
<< base::SysNSStringToUTF8(
[[original_response_ URL] absoluteString]);
void (^errorBlock)(void) = ^{
[block_client didFailWithNSErrorCode:NSURLErrorCannotDecodeContentData
netErrorCode:net::ERR_CONTENT_DECODING_FAILED];
};
callback_task_runner_->PostTask(FROM_HERE, base::BindBlock(errorBlock));
}
}
void SetImageFeatures(size_t total_size,
WebpDecoder::DecodedImageFormat format) override {
base::scoped_nsobject<NSURLResponse> imageResponse(
NewImageResponse(original_response_, total_size, format));
DCHECK(imageResponse);
base::scoped_nsprotocol<id<CRNNetworkClientProtocol>> block_client(
[underlying_client_ retain]);
callback_task_runner_->PostTask(FROM_HERE, base::BindBlock(^{
[block_client didReceiveResponse:imageResponse];
}));
}
void OnDataDecoded(NSData* data) override {
base::scoped_nsprotocol<id<CRNNetworkClientProtocol>> block_client(
[underlying_client_ retain]);
callback_task_runner_->PostTask(FROM_HERE, base::BindBlock(^{
[block_client didLoadData:data];
}));
}
private:
~WebpDecoderDelegate() override {}
base::scoped_nsprotocol<id<CRNNetworkClientProtocol>> underlying_client_;
base::scoped_nsobject<NSURLResponse> original_response_;
scoped_refptr<base::TaskRunner> callback_task_runner_;
base::Time request_creation_time_;
};
} // namespace
@interface WebPNetworkClient () {
scoped_refptr<webp_transcode::WebpDecoder> _webpDecoder;
scoped_refptr<WebpDecoderDelegate> _webpDecoderDelegate;
scoped_refptr<base::SequencedTaskRunner> _taskRunner;
base::Time _requestCreationTime;
}
@end
@implementation WebPNetworkClient
- (instancetype)init {
NOTREACHED() << "Use |-initWithTaskRunner:| instead";
return nil;
}
- (instancetype)initWithTaskRunner:
(const scoped_refptr<base::SequencedTaskRunner>&)runner {
if (self = [super init]) {
DCHECK(runner);
_taskRunner = runner;
}
return self;
}
- (void)didCreateNativeRequest:(net::URLRequest*)nativeRequest {
// Append 'image/webp' to the outgoing 'Accept' header.
const net::HttpRequestHeaders& headers =
nativeRequest->extra_request_headers();
std::string acceptHeader;
if (headers.GetHeader("Accept", &acceptHeader)) {
// Add 'image/webp' if it isn't in the Accept header yet.
if (acceptHeader.find(kWebPMimeType) == std::string::npos) {
acceptHeader += std::string(",") + kWebPMimeType;
nativeRequest->SetExtraRequestHeaderByName("Accept", acceptHeader, true);
}
} else {
// All requests should already have an Accept: header, so this case
// should never happen outside of unit tests.
nativeRequest->SetExtraRequestHeaderByName("Accept", kWebPMimeType, false);
}
[super didCreateNativeRequest:nativeRequest];
}
- (void)didLoadData:(NSData*)data {
if (_webpDecoder.get()) {
// |data| is assumed to be immutable.
base::scoped_nsobject<NSData> scopedData([data retain]);
_taskRunner->PostTask(FROM_HERE, base::Bind(&WebpDecoder::OnDataReceived,
_webpDecoder, scopedData));
} else {
[super didLoadData:data];
}
}
- (void)didReceiveResponse:(NSURLResponse*)response {
DCHECK(self.underlyingClient);
NSString* responseMimeType = [response MIMEType];
if (responseMimeType &&
[responseMimeType caseInsensitiveCompare:kNSWebPMimeType] ==
NSOrderedSame) {
_webpDecoderDelegate =
new WebpDecoderDelegate(self.underlyingClient, _requestCreationTime,
base::ThreadTaskRunnerHandle::Get());
_webpDecoder = new webp_transcode::WebpDecoder(_webpDecoderDelegate.get());
base::scoped_nsobject<NSURLResponse> scoped_response([response copy]);
_taskRunner->PostTask(FROM_HERE,
base::Bind(&WebpDecoderDelegate::SetOriginalResponse,
_webpDecoderDelegate, scoped_response));
// Do not call super here, the WebpDecoderDelegate will update the mime type
// and call |-didReceiveResponse:|.
} else {
// If this isn't a WebP, pass the call up the chain.
// TODO(marq): It would be nice if at this point the client could remove
// itself from the client stack.
[super didReceiveResponse:response];
}
}
- (void)didFinishLoading {
if (_webpDecoder.get()) {
_taskRunner->PostTask(FROM_HERE,
base::Bind(&WebpDecoder::Stop, _webpDecoder));
} else {
[super didFinishLoading];
}
}
@end
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