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// Copyright (c) 2010 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/content_settings/content_settings_pattern.h"
#include "base/string_util.h"
#include "net/base/net_util.h"
#include "googleurl/src/gurl.h"
#include "googleurl/src/url_canon.h"
// The version of the pattern format implemented. Version 1 includes the
// following patterns:
// - [*.]domain.tld (matches domain.tld and all sub-domains)
// - host (matches an exact hostname)
// - a.b.c.d (matches an exact IPv4 ip)
// - [a:b:c:d:e:f:g:h] (matches an exact IPv6 ip)
// - file:///tmp/test.html (a complete URL without a host)
// Version 2 adds a resource identifier for plugins.
// TODO(jochen): update once this feature is no longer behind a flag.
const int ContentSettingsPattern::kContentSettingsPatternVersion = 1;
const char* ContentSettingsPattern::kDomainWildcard = "[*.]";
const size_t ContentSettingsPattern::kDomainWildcardLength = 4;
// static
ContentSettingsPattern ContentSettingsPattern::FromURL(
const GURL& url) {
return ContentSettingsPattern(!url.has_host() || url.HostIsIPAddress() ?
net::GetHostOrSpecFromURL(url) :
std::string(kDomainWildcard) + url.host());
}
// static
ContentSettingsPattern ContentSettingsPattern::FromURLNoWildcard(
const GURL& url) {
return ContentSettingsPattern(net::GetHostOrSpecFromURL(url));
}
bool ContentSettingsPattern::IsValid() const {
if (pattern_.empty())
return false;
const std::string host(pattern_.length() > kDomainWildcardLength &&
StartsWithASCII(pattern_, kDomainWildcard, false) ?
pattern_.substr(kDomainWildcardLength) :
pattern_);
url_canon::CanonHostInfo host_info;
return host.find('*') == std::string::npos &&
!net::CanonicalizeHost(host, &host_info).empty();
}
bool ContentSettingsPattern::Matches(const GURL& url) const {
if (!IsValid())
return false;
const std::string host(net::GetHostOrSpecFromURL(url));
if (pattern_.length() < kDomainWildcardLength ||
!StartsWithASCII(pattern_, kDomainWildcard, false))
return pattern_ == host;
const size_t match =
host.rfind(pattern_.substr(kDomainWildcardLength));
return (match != std::string::npos) &&
(match == 0 || host[match - 1] == '.') &&
(match + pattern_.length() - kDomainWildcardLength == host.length());
}
std::string ContentSettingsPattern::CanonicalizePattern() const {
if (!IsValid()) {
return "";
}
bool starts_with_wildcard = pattern_.length() > kDomainWildcardLength &&
StartsWithASCII(pattern_, kDomainWildcard, false);
const std::string host(starts_with_wildcard ?
pattern_.substr(kDomainWildcardLength) : pattern_);
std::string canonicalized_pattern =
starts_with_wildcard ? kDomainWildcard : "";
url_canon::CanonHostInfo host_info;
canonicalized_pattern += net::CanonicalizeHost(host, &host_info);
return canonicalized_pattern;
}
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