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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/payments/content/payment_handler_navigation_throttle.h"
#include <cstddef>
#include <string>
#include "components/payments/content/payments_userdata_key.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/navigation_throttle.h"
#include "content/public/browser/web_contents.h"
#include "net/http/http_response_headers.h"
namespace payments {
constexpr char kApplicationJavascript[] = "application/javascript";
constexpr char kApplicationXml[] = "application/xml";
constexpr char kApplicationJson[] = "application/json";
PaymentHandlerNavigationThrottle::PaymentHandlerNavigationThrottle(
content::NavigationThrottleRegistry& registry)
: content::NavigationThrottle(registry) {}
PaymentHandlerNavigationThrottle::~PaymentHandlerNavigationThrottle() = default;
const char* PaymentHandlerNavigationThrottle::GetNameForLogging() {
return "PaymentHandlerNavigationThrottle";
}
// static
void PaymentHandlerNavigationThrottle::MarkPaymentHandlerWebContents(
content::WebContents* web_contents) {
if (!web_contents) {
return;
}
web_contents->SetUserData(kPaymentHandlerWebContentsUserDataKey,
std::make_unique<base::SupportsUserData::Data>());
}
// static
void PaymentHandlerNavigationThrottle::MaybeCreateAndAdd(
content::NavigationThrottleRegistry& registry) {
content::NavigationHandle& handle = registry.GetNavigationHandle();
if (!handle.GetWebContents() || !handle.GetWebContents()->GetUserData(
kPaymentHandlerWebContentsUserDataKey)) {
return;
}
registry.AddThrottle(
std::make_unique<PaymentHandlerNavigationThrottle>(registry));
}
content::NavigationThrottle::ThrottleCheckResult
PaymentHandlerNavigationThrottle::WillProcessResponse() {
if (!navigation_handle()) {
return PROCEED;
}
const net::HttpResponseHeaders* response_headers =
navigation_handle()->GetResponseHeaders();
if (!response_headers) {
return PROCEED;
}
std::string mime_type;
response_headers->GetMimeType(&mime_type);
// This allowlist is made to exclude edge-cases whose vulnerabilities could
// be exploited (e.g., application/pdf, see crbug.com/1159267).
if (base::StartsWith(mime_type, "text/",
base::CompareCase::INSENSITIVE_ASCII) ||
base::StartsWith(mime_type, "image/",
base::CompareCase::INSENSITIVE_ASCII) ||
base::StartsWith(mime_type, "video/",
base::CompareCase::INSENSITIVE_ASCII) ||
mime_type == kApplicationJavascript || mime_type == kApplicationXml ||
mime_type == kApplicationJson) {
return PROCEED;
}
VLOG(0) << "Blocked the payment handler from navigating to a page "
<< navigation_handle()->GetURL().spec() << " of " << mime_type
<< " mime type.";
return BLOCK_RESPONSE;
}
} // namespace payments
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