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// Copyright 2016 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 "components/ntp_snippets/ntp_snippets_fetcher.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/strings/stringprintf.h"
#include "base/task_runner_util.h"
#include "components/signin/core/browser/profile_oauth2_token_service.h"
#include "components/signin/core/browser/signin_manager.h"
#include "components/signin/core/browser/signin_tracker.h"
#include "net/base/load_flags.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_status_code.h"
#include "net/url_request/url_fetcher.h"
using net::URLFetcher;
using net::URLRequestContextGetter;
using net::HttpRequestHeaders;
using net::URLRequestStatus;
namespace ntp_snippets {
const char kSnippetSuggestionsFilename[] = "ntp_snippets.json";
const char kApiScope[] = "https://www.googleapis.com/auth/webhistory";
const char kContentSnippetsServer[] =
"https://chromereader-pa.googleapis.com/v1/fetch";
const char kAuthorizationRequestHeaderFormat[] = "Bearer %s";
const char kUnpersonalizedRequestParameters[] =
"{ \"response_detail_level\": \"FULL_DEBUG\", \"advanced_options\": { "
"\"local_scoring_params\": {\"content_params\" : { "
"\"only_return_personalized_results\": false } }, "
"\"global_scoring_params\": { \"num_to_return\": 10 } } }";
base::FilePath GetSnippetsSuggestionsPath(const base::FilePath& base_dir) {
return base_dir.AppendASCII(kSnippetSuggestionsFilename);
}
NTPSnippetsFetcher::NTPSnippetsFetcher(
scoped_refptr<base::SequencedTaskRunner> file_task_runner,
SigninManagerBase* signin_manager,
OAuth2TokenService* token_service,
scoped_refptr<URLRequestContextGetter> url_request_context_getter,
const base::FilePath& base_download_path)
: OAuth2TokenService::Consumer("NTP_snippets"),
file_task_runner_(file_task_runner),
url_request_context_getter_(url_request_context_getter),
signin_manager_(signin_manager),
token_service_(token_service),
download_path_(GetSnippetsSuggestionsPath(base_download_path)),
waiting_for_refresh_token_(false),
weak_ptr_factory_(this) {}
NTPSnippetsFetcher::~NTPSnippetsFetcher() {
if (waiting_for_refresh_token_)
token_service_->RemoveObserver(this);
}
scoped_ptr<NTPSnippetsFetcher::SnippetsAvailableCallbackList::Subscription>
NTPSnippetsFetcher::AddCallback(const SnippetsAvailableCallback& callback) {
return callback_list_.Add(callback);
}
void NTPSnippetsFetcher::FetchSnippets(bool overwrite) {
if (overwrite) {
StartFetch();
} else {
base::PostTaskAndReplyWithResult(
file_task_runner_.get(), FROM_HERE,
base::Bind(&base::PathExists, download_path_),
base::Bind(&NTPSnippetsFetcher::OnFileExistsCheckDone,
weak_ptr_factory_.GetWeakPtr()));
}
}
void NTPSnippetsFetcher::OnFileExistsCheckDone(bool exists) {
if (exists) {
NotifyObservers();
} else {
StartFetch();
}
}
void NTPSnippetsFetcher::StartFetch() {
if (signin_manager_->IsAuthenticated()) {
StartTokenRequest();
} else {
if (!waiting_for_refresh_token_) {
// Wait until we get a refresh token.
waiting_for_refresh_token_ = true;
token_service_->AddObserver(this);
}
}
}
void NTPSnippetsFetcher::StartTokenRequest() {
OAuth2TokenService::ScopeSet scopes;
scopes.insert(kApiScope);
oauth_request_ = token_service_->StartRequest(
signin_manager_->GetAuthenticatedAccountId(), scopes, this);
}
void NTPSnippetsFetcher::NotifyObservers() {
callback_list_.Notify(download_path_);
}
////////////////////////////////////////////////////////////////////////////////
// OAuth2TokenService::Consumer overrides
void NTPSnippetsFetcher::OnGetTokenSuccess(
const OAuth2TokenService::Request* request,
const std::string& access_token,
const base::Time& expiration_time) {
oauth_request_.reset();
url_fetcher_ =
URLFetcher::Create(GURL(kContentSnippetsServer), URLFetcher::POST, this);
url_fetcher_->SetRequestContext(url_request_context_getter_.get());
url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SAVE_COOKIES);
HttpRequestHeaders headers;
headers.SetHeader("Authorization",
base::StringPrintf(kAuthorizationRequestHeaderFormat,
access_token.c_str()));
headers.SetHeader("Content-Type", "application/json; charset=UTF-8");
url_fetcher_->SetExtraRequestHeaders(headers.ToString());
url_fetcher_->SetUploadData("application/json",
kUnpersonalizedRequestParameters);
url_fetcher_->SaveResponseToTemporaryFile(file_task_runner_.get());
url_fetcher_->Start();
}
void NTPSnippetsFetcher::OnGetTokenFailure(
const OAuth2TokenService::Request* request,
const GoogleServiceAuthError& error) {
oauth_request_.reset();
DLOG(ERROR) << "Unable to get token: " << error.ToString();
}
////////////////////////////////////////////////////////////////////////////////
// OAuth2TokenService::Observer overrides
void NTPSnippetsFetcher::OnRefreshTokenAvailable(
const std::string& account_id) {
token_service_->RemoveObserver(this);
waiting_for_refresh_token_ = false;
StartTokenRequest();
}
////////////////////////////////////////////////////////////////////////////////
// URLFetcherDelegate overrides
void NTPSnippetsFetcher::OnURLFetchComplete(const URLFetcher* source) {
DCHECK_EQ(url_fetcher_.get(), source);
const URLRequestStatus& status = source->GetStatus();
if (!status.is_success()) {
DLOG(WARNING) << "URLRequestStatus error " << status.error()
<< " while trying to download " << source->GetURL().spec();
return;
}
int response_code = source->GetResponseCode();
if (response_code != net::HTTP_OK) {
DLOG(WARNING) << "HTTP error " << response_code
<< " while trying to download " << source->GetURL().spec();
return;
}
base::FilePath response_path;
source->GetResponseAsFilePath(false, &response_path);
base::PostTaskAndReplyWithResult(
file_task_runner_.get(), FROM_HERE,
base::Bind(&base::Move, response_path, download_path_),
base::Bind(&NTPSnippetsFetcher::OnFileMoveDone,
weak_ptr_factory_.GetWeakPtr()));
}
void NTPSnippetsFetcher::OnFileMoveDone(bool success) {
if (!success) {
DLOG(WARNING) << "Could not move file to "
<< download_path_.LossyDisplayName();
return;
}
NotifyObservers();
}
} // namespace ntp_snippets
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