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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Functions to canonicalize "standard" URLs, which are ones that have an
// authority section including a host name.
#include "url/url_canon.h"
#include "url/url_canon_internal.h"
#include "url/url_constants.h"
namespace url {
namespace {
template <typename CHAR, typename UCHAR>
bool DoCanonicalizeStandardURL(const URLComponentSource<CHAR>& source,
const Parsed& parsed,
SchemeType scheme_type,
CharsetConverter* query_converter,
CanonOutput* output,
Parsed* new_parsed) {
// Scheme: this will append the colon.
bool success = CanonicalizeScheme(source.scheme, parsed.scheme,
output, &new_parsed->scheme);
bool scheme_supports_user_info =
(scheme_type == SCHEME_WITH_HOST_PORT_AND_USER_INFORMATION);
bool scheme_supports_ports =
(scheme_type == SCHEME_WITH_HOST_PORT_AND_USER_INFORMATION ||
scheme_type == SCHEME_WITH_HOST_AND_PORT);
// Authority (username, password, host, port)
bool have_authority;
if ((scheme_supports_user_info &&
(parsed.username.is_valid() || parsed.password.is_valid())) ||
parsed.host.is_nonempty() ||
(scheme_supports_ports && parsed.port.is_valid())) {
have_authority = true;
// Only write the authority separators when we have a scheme.
if (parsed.scheme.is_valid()) {
output->push_back('/');
output->push_back('/');
}
// User info: the canonicalizer will handle the : and @.
if (scheme_supports_user_info) {
success &= CanonicalizeUserInfo(
source.username, parsed.username, source.password, parsed.password,
output, &new_parsed->username, &new_parsed->password);
} else {
new_parsed->username.reset();
new_parsed->password.reset();
}
success &= CanonicalizeHost(source.host, parsed.host,
output, &new_parsed->host);
// Host must not be empty for standard URLs.
if (parsed.host.is_empty())
success = false;
// Port: the port canonicalizer will handle the colon.
if (scheme_supports_ports) {
int default_port = DefaultPortForScheme(
&output->data()[new_parsed->scheme.begin], new_parsed->scheme.len);
success &= CanonicalizePort(source.port, parsed.port, default_port,
output, &new_parsed->port);
} else {
new_parsed->port.reset();
}
} else {
// No authority, clear the components.
have_authority = false;
new_parsed->host.reset();
new_parsed->username.reset();
new_parsed->password.reset();
new_parsed->port.reset();
success = false; // Standard URLs must have an authority.
}
// Path
if (parsed.path.is_valid()) {
success &= CanonicalizePath(source.path, parsed.path,
output, &new_parsed->path);
} else if (have_authority ||
parsed.query.is_valid() || parsed.ref.is_valid()) {
// When we have an empty path, make up a path when we have an authority
// or something following the path. The only time we allow an empty
// output path is when there is nothing else.
new_parsed->path = Component(output->length(), 1);
output->push_back('/');
} else {
// No path at all
new_parsed->path.reset();
}
// Query
CanonicalizeQuery(source.query, parsed.query, query_converter,
output, &new_parsed->query);
// Ref: ignore failure for this, since the page can probably still be loaded.
CanonicalizeRef(source.ref, parsed.ref, output, &new_parsed->ref);
// Carry over the flag for potentially dangling markup:
if (parsed.potentially_dangling_markup)
new_parsed->potentially_dangling_markup = true;
return success;
}
} // namespace
// Returns the default port for the given canonical scheme, or PORT_UNSPECIFIED
// if the scheme is unknown.
//
// Please keep blink::DefaultPortForProtocol and url::DefaultPortForProtocol in
// sync.
int DefaultPortForScheme(const char* scheme, int scheme_len) {
int default_port = PORT_UNSPECIFIED;
switch (scheme_len) {
case 4:
if (!strncmp(scheme, kHttpScheme, scheme_len))
default_port = 80;
break;
case 5:
if (!strncmp(scheme, kHttpsScheme, scheme_len))
default_port = 443;
break;
case 3:
if (!strncmp(scheme, kFtpScheme, scheme_len))
default_port = 21;
else if (!strncmp(scheme, kWssScheme, scheme_len))
default_port = 443;
break;
case 2:
if (!strncmp(scheme, kWsScheme, scheme_len))
default_port = 80;
break;
}
return default_port;
}
bool CanonicalizeStandardURL(const char* spec,
int spec_len,
const Parsed& parsed,
SchemeType scheme_type,
CharsetConverter* query_converter,
CanonOutput* output,
Parsed* new_parsed) {
return DoCanonicalizeStandardURL<char, unsigned char>(
URLComponentSource<char>(spec), parsed, scheme_type, query_converter,
output, new_parsed);
}
bool CanonicalizeStandardURL(const char16_t* spec,
int spec_len,
const Parsed& parsed,
SchemeType scheme_type,
CharsetConverter* query_converter,
CanonOutput* output,
Parsed* new_parsed) {
return DoCanonicalizeStandardURL<char16_t, char16_t>(
URLComponentSource<char16_t>(spec), parsed, scheme_type, query_converter,
output, new_parsed);
}
// It might be nice in the future to optimize this so unchanged components don't
// need to be recanonicalized. This is especially true since the common case for
// ReplaceComponents is removing things we don't want, like reference fragments
// and usernames. These cases can become more efficient if we can assume the
// rest of the URL is OK with these removed (or only the modified parts
// recanonicalized). This would be much more complex to implement, however.
//
// You would also need to update DoReplaceComponents in url_util.cc which
// relies on this re-checking everything (see the comment there for why).
bool ReplaceStandardURL(const char* base,
const Parsed& base_parsed,
const Replacements<char>& replacements,
SchemeType scheme_type,
CharsetConverter* query_converter,
CanonOutput* output,
Parsed* new_parsed) {
URLComponentSource<char> source(base);
Parsed parsed(base_parsed);
SetupOverrideComponents(base, replacements, &source, &parsed);
return DoCanonicalizeStandardURL<char, unsigned char>(
source, parsed, scheme_type, query_converter, output, new_parsed);
}
// For 16-bit replacements, we turn all the replacements into UTF-8 so the
// regular code path can be used.
bool ReplaceStandardURL(const char* base,
const Parsed& base_parsed,
const Replacements<char16_t>& replacements,
SchemeType scheme_type,
CharsetConverter* query_converter,
CanonOutput* output,
Parsed* new_parsed) {
RawCanonOutput<1024> utf8;
URLComponentSource<char> source(base);
Parsed parsed(base_parsed);
SetupUTF16OverrideComponents(base, replacements, &utf8, &source, &parsed);
return DoCanonicalizeStandardURL<char, unsigned char>(
source, parsed, scheme_type, query_converter, output, new_parsed);
}
} // namespace url
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