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// Copyright 2012 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/custom_handlers/protocol_handler.h"
#include "base/json/values_util.h"
#include "base/strings/escape.h"
#include "base/strings/utf_string_conversions.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_client.h"
#include "content/public/common/origin_util.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/is_potentially_trustworthy.h"
#include "third_party/blink/public/common/custom_handlers/protocol_handler_utils.h"
#include "third_party/blink/public/common/scheme_registry.h"
#include "third_party/blink/public/common/security/protocol_handler_security_level.h"
#include "ui/base/l10n/l10n_util.h"
using content::BrowserThread;
namespace custom_handlers {
namespace features {
// https://html.spec.whatwg.org/multipage/system-state.html#security-and-privacy
BASE_FEATURE(kStripCredentialsForExternalProtocolHandler,
"StripCredentialsForExternalProtocolHandler",
base::FEATURE_ENABLED_BY_DEFAULT);
} // namespace features
ProtocolHandler::ProtocolHandler(
const std::string& protocol,
const GURL& url,
base::Time last_modified,
blink::ProtocolHandlerSecurityLevel security_level)
: protocol_(base::ToLowerASCII(protocol)),
url_(url),
last_modified_(last_modified),
security_level_(security_level) {}
ProtocolHandler::ProtocolHandler(const ProtocolHandler&) = default;
ProtocolHandler::~ProtocolHandler() = default;
ProtocolHandler ProtocolHandler::CreateProtocolHandler(
const std::string& protocol,
const GURL& url,
blink::ProtocolHandlerSecurityLevel security_level) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return ProtocolHandler(protocol, url, base::Time::Now(), security_level);
}
ProtocolHandler::ProtocolHandler(
const std::string& protocol,
const GURL& url,
const std::string& app_id,
base::Time last_modified,
blink::ProtocolHandlerSecurityLevel security_level)
: protocol_(base::ToLowerASCII(protocol)),
url_(url),
web_app_id_(app_id),
last_modified_(last_modified),
security_level_(security_level) {}
// static
ProtocolHandler ProtocolHandler::CreateWebAppProtocolHandler(
const std::string& protocol,
const GURL& url,
const std::string& app_id) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return ProtocolHandler(protocol, url, app_id, base::Time::Now(),
blink::ProtocolHandlerSecurityLevel::kStrict);
}
ProtocolHandler::ProtocolHandler() = default;
bool ProtocolHandler::IsValidDict(const base::Value::Dict& value) {
// Note that "title" parameter is ignored.
// The |last_modified| field is optional as it was introduced in M68.
return value.FindString("protocol") && value.FindString("url");
}
bool ProtocolHandler::IsValid() const {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// We don't want to include URL's syntax checks because there are use cases of
// the protocol handlers logic that require more flexibility than the one
// specified for the registerProtocolHandler API (eg, Predefined Handlers).
if (!blink::IsAllowedCustomHandlerURL(url_, security_level_))
return false;
return blink::IsValidCustomHandlerScheme(protocol_, security_level_);
}
bool ProtocolHandler::IsSameOrigin(const ProtocolHandler& handler) const {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return handler.url().DeprecatedGetOriginAsURL() ==
url_.DeprecatedGetOriginAsURL();
}
const ProtocolHandler& ProtocolHandler::EmptyProtocolHandler() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
static const ProtocolHandler* const kEmpty = new ProtocolHandler();
return *kEmpty;
}
ProtocolHandler ProtocolHandler::CreateProtocolHandler(
const base::Value::Dict& value) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!IsValidDict(value)) {
return EmptyProtocolHandler();
}
std::string protocol, url;
// |time| defaults to the beginning of time if it is not specified.
base::Time time;
blink::ProtocolHandlerSecurityLevel security_level =
blink::ProtocolHandlerSecurityLevel::kStrict;
if (const std::string* protocol_in = value.FindString("protocol"))
protocol = *protocol_in;
if (const std::string* url_in = value.FindString("url"))
url = *url_in;
absl::optional<base::Time> time_value =
base::ValueToTime(value.Find("last_modified"));
// Treat invalid times as the default value.
if (time_value)
time = *time_value;
absl::optional<int> security_level_value = value.FindInt("security_level");
if (security_level_value) {
security_level =
blink::ProtocolHandlerSecurityLevelFrom(*security_level_value);
}
if (const base::Value* app_id_val = value.Find("app_id")) {
std::string app_id;
if (app_id_val->is_string())
app_id = app_id_val->GetString();
return ProtocolHandler(protocol, GURL(url), app_id, time, security_level);
}
return ProtocolHandler(protocol, GURL(url), time, security_level);
}
GURL ProtocolHandler::TranslateUrl(const GURL& url) const {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
std::string clean_url;
base::StringPiece url_spec(url.spec());
// Remove credentials from the url if present, in order to mitigate the risk
// of credential leakage
if ((url.has_username() || url.has_password()) &&
base::FeatureList::IsEnabled(
features::kStripCredentialsForExternalProtocolHandler)) {
GURL::Replacements replacements;
replacements.ClearUsername();
replacements.ClearPassword();
clean_url = url.ReplaceComponents(replacements).spec();
url_spec = clean_url;
}
std::string translatedUrlSpec(url_.spec());
base::ReplaceFirstSubstringAfterOffset(
&translatedUrlSpec, 0, "%s",
base::EscapeQueryParamValue(url_spec, false));
return GURL(translatedUrlSpec);
}
base::Value::Dict ProtocolHandler::Encode() const {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
base::Value::Dict d;
d.Set("protocol", protocol_);
d.Set("url", url_.spec());
d.Set("last_modified", base::TimeToValue(last_modified_));
d.Set("security_level", static_cast<int>(security_level_));
if (web_app_id_.has_value())
d.Set("app_id", web_app_id_.value());
return d;
}
std::u16string ProtocolHandler::GetProtocolDisplayName(
const std::string& protocol) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (protocol == "mailto")
return l10n_util::GetStringUTF16(IDS_REGISTER_PROTOCOL_HANDLER_MAILTO_NAME);
if (protocol == "webcal")
return l10n_util::GetStringUTF16(IDS_REGISTER_PROTOCOL_HANDLER_WEBCAL_NAME);
return base::UTF8ToUTF16(protocol);
}
std::u16string ProtocolHandler::GetProtocolDisplayName() const {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return GetProtocolDisplayName(protocol_);
}
#if !defined(NDEBUG)
std::string ProtocolHandler::ToString() const {
return "{ protocol=" + protocol_ + ", url=" + url_.spec() + " }";
}
#endif
bool ProtocolHandler::operator==(const ProtocolHandler& other) const {
return protocol_ == other.protocol_ && url_ == other.url_;
}
bool ProtocolHandler::IsEquivalent(const ProtocolHandler& other) const {
return protocol_ == other.protocol_ && url_ == other.url_;
}
bool ProtocolHandler::operator<(const ProtocolHandler& other) const {
return url_ < other.url_;
}
} // namespace custom_handlers
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