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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/webid/identity_url_loader_throttle.h"
#include <string_view>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_split.h"
#include "base/task/sequenced_task_runner.h"
#include "base/time/time.h"
#include "content/common/features.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "net/http/http_response_headers.h"
#include "services/network/public/cpp/is_potentially_trustworthy.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/mojom/webid/federated_auth_request.mojom.h"
#include "url/origin.h"
using blink::mojom::IdpSigninStatus;
namespace {
static constexpr char kSetLoginHeader[] = "Set-Login";
static constexpr char kSetLoginHeaderValueLoggedIn[] = "logged-in";
static constexpr char kSetLoginHeaderValueLoggedOut[] = "logged-out";
} // namespace
namespace content {
std::unique_ptr<blink::URLLoaderThrottle> MaybeCreateIdentityUrlLoaderThrottle(
SetIdpStatusCallback cb) {
return std::make_unique<IdentityUrlLoaderThrottle>(std::move(cb));
}
IdentityUrlLoaderThrottle::IdentityUrlLoaderThrottle(SetIdpStatusCallback cb)
: set_idp_status_cb_(std::move(cb)) {}
IdentityUrlLoaderThrottle::~IdentityUrlLoaderThrottle() = default;
void IdentityUrlLoaderThrottle::DetachFromCurrentSequence() {
set_idp_status_cb_ = base::BindRepeating(
[](scoped_refptr<base::SequencedTaskRunner> task_runner,
SetIdpStatusCallback original_cb, const url::Origin& origin,
blink::mojom::IdpSigninStatus status) {
task_runner->PostTask(
FROM_HERE, base::BindOnce(std::move(original_cb), origin, status));
},
base::SequencedTaskRunner::GetCurrentDefault(),
std::move(set_idp_status_cb_));
}
void IdentityUrlLoaderThrottle::WillStartRequest(
network::ResourceRequest* request,
bool* defer) {
request_url_ = request->url;
has_user_gesture_ = request->has_user_gesture;
}
void IdentityUrlLoaderThrottle::WillProcessResponse(
const GURL& response_url,
network::mojom::URLResponseHead* response_head,
bool* defer) {
DCHECK(response_head);
return HandleResponseOrRedirect(response_url, *response_head);
}
void IdentityUrlLoaderThrottle::WillRedirectRequest(
net::RedirectInfo* redirect_info,
const network::mojom::URLResponseHead& response_head,
bool* defer,
std::vector<std::string>* to_be_removed_request_headers,
net::HttpRequestHeaders* modified_request_headers,
net::HttpRequestHeaders* modified_cors_exempt_request_headers) {
// We want to check headers for each redirect. It is common that the header
// is on the initial load which then redirects back to a homepage.
HandleResponseOrRedirect(request_url_, response_head);
request_url_ = redirect_info->new_url;
}
void IdentityUrlLoaderThrottle::HandleResponseOrRedirect(
const GURL& response_url,
const network::mojom::URLResponseHead& response_head) {
url::Origin origin = url::Origin::Create(response_url);
if (!network::IsOriginPotentiallyTrustworthy(origin))
return;
// TODO(crbug.com/40236764):
// - Limit to toplevel frames
// - Decide whether to limit to same-origin
// - Decide the right behavior with respect to user gestures.
scoped_refptr<net::HttpResponseHeaders> headers = response_head.headers;
if (!headers)
return;
std::string header;
if (HeaderHasToken(*headers, kSetLoginHeader, kSetLoginHeaderValueLoggedIn)) {
// Mark IDP as logged in
VLOG(1) << "IDP signed in: " << response_url.spec();
UMA_HISTOGRAM_BOOLEAN("Blink.FedCm.IdpSigninRequestInitiatedByUser",
has_user_gesture_);
set_idp_status_cb_.Run(origin, IdpSigninStatus::kSignedIn);
} else if (HeaderHasToken(*headers, kSetLoginHeader,
kSetLoginHeaderValueLoggedOut)) {
// Mark IDP as logged out
VLOG(1) << "IDP signed out: " << response_url.spec();
UMA_HISTOGRAM_BOOLEAN("Blink.FedCm.IdpSignoutRequestInitiatedByUser",
has_user_gesture_);
set_idp_status_cb_.Run(origin, IdpSigninStatus::kSignedOut);
}
}
// static
bool IdentityUrlLoaderThrottle::HeaderHasToken(
const net::HttpResponseHeaders& headers,
std::string_view header_name,
std::string_view token) {
if (!headers.HasHeader(header_name)) {
return false;
}
std::string value =
headers.GetNormalizedHeader(header_name).value_or(std::string());
std::vector<std::string_view> tokens = base::SplitStringPiece(
value, ";", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
return base::Contains(tokens, token);
}
} // namespace content
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