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// Copyright (c) 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.
#include "chrome/browser/extensions/api/identity/gaia_web_auth_flow.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "google_apis/gaia/gaia_urls.h"
#include "net/base/escape.h"
namespace extensions {
GaiaWebAuthFlow::GaiaWebAuthFlow(Delegate* delegate,
Profile* profile,
const std::string& extension_id,
const OAuth2Info& oauth2_info,
const std::string& locale)
: delegate_(delegate),
profile_(profile) {
const char kOAuth2RedirectPathFormat[] = "/%s#";
const char kOAuth2AuthorizeFormat[] =
"%s?response_type=token&approval_prompt=force&authuser=0&"
"client_id=%s&"
"scope=%s&"
"origin=chrome-extension://%s/&"
"redirect_uri=%s:/%s&"
"hl=%s";
std::vector<std::string> client_id_parts;
base::SplitString(oauth2_info.client_id, '.', &client_id_parts);
std::reverse(client_id_parts.begin(), client_id_parts.end());
redirect_scheme_ = JoinString(client_id_parts, '.');
redirect_path_prefix_ =
base::StringPrintf(kOAuth2RedirectPathFormat, extension_id.c_str());
auth_url_ = GURL(base::StringPrintf(
kOAuth2AuthorizeFormat,
GaiaUrls::GetInstance()->oauth2_auth_url().c_str(),
oauth2_info.client_id.c_str(),
net::EscapeUrlEncodedData(JoinString(oauth2_info.scopes, ' '), true)
.c_str(),
extension_id.c_str(),
redirect_scheme_.c_str(),
extension_id.c_str(),
locale.c_str()));
}
GaiaWebAuthFlow::~GaiaWebAuthFlow() {
if (web_flow_)
web_flow_.release()->DetachDelegateAndDelete();
}
void GaiaWebAuthFlow::Start() {
ubertoken_fetcher_.reset(new UbertokenFetcher(profile_, this));
ubertoken_fetcher_->StartFetchingToken();
}
void GaiaWebAuthFlow::OnUbertokenSuccess(const std::string& token) {
const char kMergeSessionQueryFormat[] = "?uberauth=%s&"
"continue=%s&"
"source=appsv2";
std::string merge_query = base::StringPrintf(
kMergeSessionQueryFormat,
net::EscapeUrlEncodedData(token, true).c_str(),
net::EscapeUrlEncodedData(auth_url_.spec(), true).c_str());
GURL merge_url(GaiaUrls::GetInstance()->merge_session_url() + merge_query);
web_flow_ = CreateWebAuthFlow(merge_url);
web_flow_->Start();
}
void GaiaWebAuthFlow::OnUbertokenFailure(const GoogleServiceAuthError& error) {
delegate_->OnGaiaFlowFailure(
GaiaWebAuthFlow::SERVICE_AUTH_ERROR, error, std::string());
}
void GaiaWebAuthFlow::OnAuthFlowFailure(WebAuthFlow::Failure failure) {
GaiaWebAuthFlow::Failure gaia_failure;
switch (failure) {
case WebAuthFlow::WINDOW_CLOSED:
gaia_failure = GaiaWebAuthFlow::WINDOW_CLOSED;
break;
case WebAuthFlow::LOAD_FAILED:
gaia_failure = GaiaWebAuthFlow::LOAD_FAILED;
break;
default:
NOTREACHED() << "Unexpected error from web auth flow: " << failure;
gaia_failure = GaiaWebAuthFlow::LOAD_FAILED;
break;
}
delegate_->OnGaiaFlowFailure(
gaia_failure,
GoogleServiceAuthError(GoogleServiceAuthError::NONE),
std::string());
}
void GaiaWebAuthFlow::OnAuthFlowURLChange(const GURL& url) {
const char kOAuth2RedirectAccessTokenKey[] = "access_token";
const char kOAuth2RedirectErrorKey[] = "error";
const char kOAuth2ExpiresInKey[] = "expires_in";
// The format of the target URL is:
// reversed.oauth.client.id:/extensionid#access_token=TOKEN
//
// Because there is no double slash, everything after the scheme is
// interpreted as a path, including the fragment.
if (url.scheme() == redirect_scheme_ && !url.has_host() && !url.has_port() &&
StartsWithASCII(url.path(), redirect_path_prefix_, true)) {
web_flow_.release()->DetachDelegateAndDelete();
std::string fragment =
url.path().substr(redirect_path_prefix_.length(), std::string::npos);
std::vector<std::pair<std::string, std::string> > pairs;
base::SplitStringIntoKeyValuePairs(fragment, '=', '&', &pairs);
std::string access_token;
std::string error;
std::string expiration;
for (std::vector<std::pair<std::string, std::string> >::iterator
it = pairs.begin();
it != pairs.end();
++it) {
if (it->first == kOAuth2RedirectAccessTokenKey)
access_token = it->second;
else if (it->first == kOAuth2RedirectErrorKey)
error = it->second;
else if (it->first == kOAuth2ExpiresInKey)
expiration = it->second;
}
if (access_token.empty() && error.empty()) {
delegate_->OnGaiaFlowFailure(
GaiaWebAuthFlow::INVALID_REDIRECT,
GoogleServiceAuthError(GoogleServiceAuthError::NONE),
std::string());
} else if (!error.empty()) {
delegate_->OnGaiaFlowFailure(
GaiaWebAuthFlow::OAUTH_ERROR,
GoogleServiceAuthError(GoogleServiceAuthError::NONE),
error);
} else {
delegate_->OnGaiaFlowCompleted(access_token, expiration);
}
}
}
void GaiaWebAuthFlow::OnAuthFlowTitleChange(const std::string& title) {
// On the final page the title will be "Loading <redirect-url>".
// Treat it as though we'd really been redirected to <redirect-url>.
const char kRedirectPrefix[] = "Loading ";
std::string prefix(kRedirectPrefix);
if (StartsWithASCII(title, prefix, true)) {
GURL url(title.substr(prefix.length(), std::string::npos));
if (url.is_valid())
OnAuthFlowURLChange(url);
}
}
scoped_ptr<WebAuthFlow> GaiaWebAuthFlow::CreateWebAuthFlow(GURL url) {
return scoped_ptr<WebAuthFlow>(new WebAuthFlow(this,
profile_,
url,
WebAuthFlow::INTERACTIVE));
}
} // extensions
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