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// Copyright (c) 2010 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.
#include "chrome/browser/speech/speech_recognition_request.h"
#include "app/l10n_util.h"
#include "base/json/json_reader.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/common/net/url_request_context_getter.h"
#include "net/base/escape.h"
#include "net/base/load_flags.h"
#include "net/url_request/url_request_status.h"
namespace {
const char* const kDefaultSpeechRecognitionUrl =
"http://www.google.com/speech-api/v1/recognize?client=chromium&";
const char* const kHypothesesString = "hypotheses";
const char* const kUtteranceString = "utterance";
const char* const kConfidenceString = "confidence";
bool ParseServerResponse(const std::string& response_body,
speech_input::SpeechInputResultArray* result) {
if (response_body.empty()) {
LOG(WARNING) << "ParseServerResponse: Response was empty.";
return false;
}
DVLOG(1) << "ParseServerResponse: Parsing response " << response_body;
// Parse the response, ignoring comments.
std::string error_msg;
scoped_ptr<Value> response_value(base::JSONReader::ReadAndReturnError(
response_body, false, NULL, &error_msg));
if (response_value == NULL) {
LOG(WARNING) << "ParseServerResponse: JSONReader failed : " << error_msg;
return false;
}
if (!response_value->IsType(Value::TYPE_DICTIONARY)) {
VLOG(1) << "ParseServerResponse: Unexpected response type "
<< response_value->GetType();
return false;
}
const DictionaryValue* response_object =
static_cast<DictionaryValue*>(response_value.get());
// Get the hypotheses
Value* hypotheses_value = NULL;
if (!response_object->Get(kHypothesesString, &hypotheses_value)) {
VLOG(1) << "ParseServerResponse: Missing hypotheses attribute.";
return false;
}
DCHECK(hypotheses_value);
if (!hypotheses_value->IsType(Value::TYPE_LIST)) {
VLOG(1) << "ParseServerResponse: Unexpected hypotheses type "
<< hypotheses_value->GetType();
return false;
}
const ListValue* hypotheses_list = static_cast<ListValue*>(hypotheses_value);
if (hypotheses_list->GetSize() == 0) {
VLOG(1) << "ParseServerResponse: hypotheses list is empty.";
return false;
}
size_t index = 0;
for (; index < hypotheses_list->GetSize(); ++index) {
Value* hypothesis = NULL;
if (!hypotheses_list->Get(index, &hypothesis)) {
LOG(WARNING) << "ParseServerResponse: Unable to read hypothesis value.";
break;
}
DCHECK(hypothesis);
if (!hypothesis->IsType(Value::TYPE_DICTIONARY)) {
LOG(WARNING) << "ParseServerResponse: Unexpected value type "
<< hypothesis->GetType();
break;
}
const DictionaryValue* hypothesis_value =
static_cast<DictionaryValue*>(hypothesis);
string16 utterance;
if (!hypothesis_value->GetString(kUtteranceString, &utterance)) {
LOG(WARNING) << "ParseServerResponse: Missing utterance value.";
break;
}
// It is not an error if the 'confidence' field is missing.
double confidence = 0.0;
hypothesis_value->GetReal(kConfidenceString, &confidence);
result->push_back(speech_input::SpeechInputResultItem(utterance,
confidence));
}
if (index < hypotheses_list->GetSize()) {
result->clear();
return false;
}
return true;
}
} // namespace
namespace speech_input {
int SpeechRecognitionRequest::url_fetcher_id_for_tests = 0;
SpeechRecognitionRequest::SpeechRecognitionRequest(
URLRequestContextGetter* context, Delegate* delegate)
: url_context_(context),
delegate_(delegate) {
DCHECK(delegate);
}
SpeechRecognitionRequest::~SpeechRecognitionRequest() {}
bool SpeechRecognitionRequest::Send(const std::string& language,
const std::string& grammar,
const std::string& content_type,
const std::string& audio_data) {
DCHECK(!url_fetcher_.get());
std::vector<std::string> parts;
if (!language.empty()) {
parts.push_back("lang=" + EscapeQueryParamValue(language, true));
} else {
std::string app_locale = l10n_util::GetApplicationLocale("");
parts.push_back("lang=" + EscapeQueryParamValue(app_locale, true));
}
if (!grammar.empty())
parts.push_back("grammar=" + EscapeQueryParamValue(grammar, true));
GURL url(std::string(kDefaultSpeechRecognitionUrl) + JoinString(parts, '&'));
url_fetcher_.reset(URLFetcher::Create(url_fetcher_id_for_tests,
url,
URLFetcher::POST,
this));
url_fetcher_->set_upload_data(content_type, audio_data);
url_fetcher_->set_request_context(url_context_);
// The speech recognition API does not require user identification as part
// of requests, so we don't send cookies or auth data for these requests to
// prevent any accidental connection between users who are logged into the
// domain for other services (e.g. bookmark sync) with the speech requests.
url_fetcher_->set_load_flags(
net::LOAD_DO_NOT_SAVE_COOKIES | net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SEND_AUTH_DATA);
url_fetcher_->Start();
return true;
}
void SpeechRecognitionRequest::OnURLFetchComplete(
const URLFetcher* source,
const GURL& url,
const URLRequestStatus& status,
int response_code,
const ResponseCookies& cookies,
const std::string& data) {
DCHECK_EQ(url_fetcher_.get(), source);
bool error = !status.is_success() || response_code != 200;
SpeechInputResultArray result;
if (!error)
error = !ParseServerResponse(data, &result);
url_fetcher_.reset();
DVLOG(1) << "SpeechRecognitionRequest: Invoking delegate with result.";
delegate_->SetRecognitionResult(error, result);
}
} // namespace speech_input
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