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// Copyright (c) 2012 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 "components/content_settings/core/common/content_settings_pattern_parser.h"
#include "base/strings/string_util.h"
#include "url/url_constants.h"
namespace {
const char kDomainWildcard[] = "[*.]";
const size_t kDomainWildcardLength = 4;
const char kHostWildcard[] = "*";
const char kPathWildcard[] = "*";
const char kPortWildcard[] = "*";
const char kSchemeWildcard[] = "*";
const char kUrlPathSeparator[] = "/";
const char kUrlPortSeparator[] = ":";
class Component {
public:
Component() : start(0), len(0) {}
Component(size_t s, size_t l) : start(s), len(l) {}
bool IsNonEmpty() {
return len > 0;
}
size_t start;
size_t len;
};
} // namespace
namespace content_settings {
void PatternParser::Parse(const std::string& pattern_spec,
ContentSettingsPattern::BuilderInterface* builder) {
if (pattern_spec == "*") {
builder->WithSchemeWildcard();
builder->WithDomainWildcard();
builder->WithPortWildcard();
return;
}
// Initialize components for the individual patterns parts to empty
// sub-strings.
Component scheme_component;
Component host_component;
Component port_component;
Component path_component;
size_t start = 0;
size_t current_pos = 0;
if (pattern_spec.empty())
return;
// Test if a scheme pattern is in the spec.
const std::string standard_scheme_separator(url::kStandardSchemeSeparator);
current_pos = pattern_spec.find(standard_scheme_separator, start);
if (current_pos != std::string::npos) {
scheme_component = Component(start, current_pos);
start = current_pos + standard_scheme_separator.size();
current_pos = start;
} else {
current_pos = start;
}
if (start >= pattern_spec.size())
return; // Bad pattern spec.
// Jump to the end of domain wildcards or an IPv6 addresses. IPv6 addresses
// contain ':'. So first move to the end of an IPv6 address befor searching
// for the ':' that separates the port form the host.
if (pattern_spec[current_pos] == '[')
current_pos = pattern_spec.find("]", start);
if (current_pos == std::string::npos)
return; // Bad pattern spec.
current_pos = pattern_spec.find(std::string(kUrlPortSeparator), current_pos);
if (current_pos == std::string::npos) {
// No port spec found
current_pos = pattern_spec.find(std::string(kUrlPathSeparator), start);
if (current_pos == std::string::npos) {
current_pos = pattern_spec.size();
host_component = Component(start, current_pos - start);
} else {
// Pattern has a path spec.
host_component = Component(start, current_pos - start);
}
start = current_pos;
} else {
// Port spec found.
host_component = Component(start, current_pos - start);
start = current_pos + 1;
if (start < pattern_spec.size()) {
current_pos = pattern_spec.find(std::string(kUrlPathSeparator), start);
if (current_pos == std::string::npos) {
current_pos = pattern_spec.size();
}
port_component = Component(start, current_pos - start);
start = current_pos;
}
}
current_pos = pattern_spec.size();
if (start < current_pos) {
// Pattern has a path spec.
path_component = Component(start, current_pos - start);
}
// Set pattern parts.
std::string scheme;
if (scheme_component.IsNonEmpty()) {
scheme = pattern_spec.substr(scheme_component.start, scheme_component.len);
if (scheme == kSchemeWildcard) {
builder->WithSchemeWildcard();
} else {
builder->WithScheme(scheme);
}
} else {
builder->WithSchemeWildcard();
}
if (host_component.IsNonEmpty()) {
std::string host = pattern_spec.substr(host_component.start,
host_component.len);
if (host == kHostWildcard) {
builder->WithDomainWildcard();
} else if (StartsWithASCII(host, kDomainWildcard, true)) {
host = host.substr(kDomainWildcardLength);
builder->WithDomainWildcard();
builder->WithHost(host);
} else {
// If the host contains a wildcard symbol then it is invalid.
if (host.find(kHostWildcard) != std::string::npos) {
builder->Invalid();
return;
}
builder->WithHost(host);
}
}
if (port_component.IsNonEmpty()) {
const std::string port = pattern_spec.substr(port_component.start,
port_component.len);
if (port == kPortWildcard) {
builder->WithPortWildcard();
} else {
// Check if the port string represents a valid port.
for (size_t i = 0; i < port.size(); ++i) {
if (!IsAsciiDigit(port[i])) {
builder->Invalid();
return;
}
}
// TODO(markusheintz): Check port range.
builder->WithPort(port);
}
} else {
if (!ContentSettingsPattern::IsNonWildcardDomainNonPortScheme(scheme) &&
scheme != url::kFileScheme)
builder->WithPortWildcard();
}
if (path_component.IsNonEmpty()) {
const std::string path = pattern_spec.substr(path_component.start,
path_component.len);
if (path.substr(1) == kPathWildcard)
builder->WithPathWildcard();
else
builder->WithPath(path);
}
}
// static
std::string PatternParser::ToString(
const ContentSettingsPattern::PatternParts& parts) {
// Return the most compact form to support legacy code and legacy pattern
// strings.
if (parts.is_scheme_wildcard &&
parts.has_domain_wildcard &&
parts.host.empty() &&
parts.is_port_wildcard)
return "*";
std::string str;
if (!parts.is_scheme_wildcard)
str += parts.scheme + url::kStandardSchemeSeparator;
if (parts.scheme == url::kFileScheme) {
if (parts.is_path_wildcard)
return str + kUrlPathSeparator + kPathWildcard;
else
return str + parts.path;
}
if (parts.has_domain_wildcard) {
if (parts.host.empty())
str += kHostWildcard;
else
str += kDomainWildcard;
}
str += parts.host;
if (ContentSettingsPattern::IsNonWildcardDomainNonPortScheme(parts.scheme)) {
str += parts.path.empty() ? std::string(kUrlPathSeparator) : parts.path;
return str;
}
if (!parts.is_port_wildcard) {
str += std::string(kUrlPortSeparator) + parts.port;
}
return str;
}
} // namespace content_settings
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