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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.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/350788890): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
// Functions for canonicalizing "path" URLs. Not to be confused with the path
// of a URL, these are URLs that have no authority section, only a path. For
// example, "javascript:" and "data:".
#include "url/url_canon.h"
#include "url/url_canon_internal.h"
namespace url {
namespace {
// Canonicalize the given |component| from |source| into |output| and
// |new_component|. If |separator| is non-zero, it is pre-pended to |output|
// prior to the canonicalized component; i.e. for the '?' or '#' characters.
template <typename CHAR, typename UCHAR>
void DoCanonicalizePathComponent(const CHAR* source,
const Component& component,
char separator,
CanonOutput* output,
Component* new_component) {
if (component.is_valid()) {
if (separator)
output->push_back(separator);
// Copy the path using path URL's more lax escaping rules (think for
// javascript:). We convert to UTF-8 and escape characters from the
// C0 control percent-encode set, but leave all other characters alone.
// This helps readability of JavaScript.
// https://url.spec.whatwg.org/#cannot-be-a-base-url-path-state
// https://url.spec.whatwg.org/#c0-control-percent-encode-set
new_component->begin = output->length();
size_t end = static_cast<size_t>(component.end());
for (size_t i = static_cast<size_t>(component.begin); i < end; i++) {
UCHAR uch = static_cast<UCHAR>(source[i]);
if (IsInC0ControlPercentEncodeSet(uch)) {
AppendUTF8EscapedChar(source, &i, end, output);
} else {
output->push_back(static_cast<char>(uch));
}
}
new_component->len = output->length() - new_component->begin;
} else {
// Empty part.
new_component->reset();
}
}
template <typename CHAR, typename UCHAR>
bool DoCanonicalizePathURL(const URLComponentSource<CHAR>& source,
const Parsed& parsed,
CanonOutput* output,
Parsed* new_parsed) {
// Scheme: this will append the colon.
bool success =
CanonicalizeScheme(parsed.scheme.maybe_as_string_view_on(source.scheme),
output, &new_parsed->scheme);
// We assume there's no authority for path URLs. Note that hosts should never
// have -1 length.
new_parsed->username.reset();
new_parsed->password.reset();
new_parsed->host.reset();
new_parsed->port.reset();
// Canonicalize path via the weaker path URL rules.
//
// Note: parsing the path part should never cause a failure, see
// https://url.spec.whatwg.org/#cannot-be-a-base-url-path-state
DoCanonicalizePathComponent<CHAR, UCHAR>(source.path, parsed.path, '\0',
output, &new_parsed->path);
// Similar to mailto:, always use the default UTF-8 charset converter for
// query.
CanonicalizeQuery(parsed.query.maybe_as_string_view_on(source.query), nullptr,
output, &new_parsed->query);
CanonicalizeRef(parsed.ref.maybe_as_string_view_on(source.ref), output,
&new_parsed->ref);
return success;
}
} // namespace
bool CanonicalizePathURL(const char* spec,
int spec_len,
const Parsed& parsed,
CanonOutput* output,
Parsed* new_parsed) {
return DoCanonicalizePathURL<char, unsigned char>(
URLComponentSource<char>(spec), parsed, output, new_parsed);
}
bool CanonicalizePathURL(const char16_t* spec,
int spec_len,
const Parsed& parsed,
CanonOutput* output,
Parsed* new_parsed) {
return DoCanonicalizePathURL<char16_t, char16_t>(
URLComponentSource<char16_t>(spec), parsed, output, new_parsed);
}
void CanonicalizePathURLPath(const char* source,
const Component& component,
CanonOutput* output,
Component* new_component) {
DoCanonicalizePathComponent<char, unsigned char>(source, component, '\0',
output, new_component);
}
void CanonicalizePathURLPath(const char16_t* source,
const Component& component,
CanonOutput* output,
Component* new_component) {
DoCanonicalizePathComponent<char16_t, char16_t>(source, component, '\0',
output, new_component);
}
bool ReplacePathURL(const char* base,
const Parsed& base_parsed,
const Replacements<char>& replacements,
CanonOutput* output,
Parsed* new_parsed) {
URLComponentSource<char> source(base);
Parsed parsed(base_parsed);
SetupOverrideComponents(base, replacements, &source, &parsed);
return DoCanonicalizePathURL<char, unsigned char>(
source, parsed, output, new_parsed);
}
bool ReplacePathURL(const char* base,
const Parsed& base_parsed,
const Replacements<char16_t>& replacements,
CanonOutput* output,
Parsed* new_parsed) {
RawCanonOutput<1024> utf8;
URLComponentSource<char> source(base);
Parsed parsed(base_parsed);
SetupUTF16OverrideComponents(base, replacements, &utf8, &source, &parsed);
return DoCanonicalizePathURL<char, unsigned char>(
source, parsed, output, new_parsed);
}
} // namespace url
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