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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.
#ifndef URL_URL_UTIL_H_
#define URL_URL_UTIL_H_
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include "polyfills/base/component_export.h"
#include "url/third_party/mozilla/url_parse.h"
#include "url/url_canon.h"
#include "url/url_constants.h"
namespace url {
// Init ------------------------------------------------------------------------
// Used for tests that need to reset schemes. Note that this can only be used
// in conjunction with ScopedSchemeRegistryForTests.
COMPONENT_EXPORT(URL) void ClearSchemesForTests();
class ScopedSchemeRegistryInternal;
// Stores the SchemeRegistry upon creation, allowing tests to modify a copy of
// it, and restores the original SchemeRegistry when deleted.
class COMPONENT_EXPORT(URL) ScopedSchemeRegistryForTests {
public:
ScopedSchemeRegistryForTests();
~ScopedSchemeRegistryForTests();
private:
std::unique_ptr<ScopedSchemeRegistryInternal> internal_;
};
// Schemes ---------------------------------------------------------------------
// Changes the behavior of SchemeHostPort / Origin to allow non-standard schemes
// to be specified, instead of canonicalizing them to an invalid SchemeHostPort
// or opaque Origin, respectively. This is used for Android WebView backwards
// compatibility, which allows the use of custom schemes: content hosted in
// Android WebView assumes that one URL with a non-standard scheme will be
// same-origin to another URL with the same non-standard scheme.
//
// Not thread-safe.
COMPONENT_EXPORT(URL) void EnableNonStandardSchemesForAndroidWebView();
// Whether or not SchemeHostPort and Origin allow non-standard schemes.
COMPONENT_EXPORT(URL) bool AllowNonStandardSchemesForAndroidWebView();
// The following Add*Scheme method are not threadsafe and can not be called
// concurrently with any other url_util function. They will assert if the lists
// of schemes have been locked (see LockSchemeRegistries), or used.
// Adds an application-defined scheme to the internal list of "standard-format"
// URL schemes. A standard-format scheme adheres to what RFC 3986 calls "generic
// URI syntax" (https://tools.ietf.org/html/rfc3986#section-3).
COMPONENT_EXPORT(URL)
void AddStandardScheme(const char* new_scheme, SchemeType scheme_type);
// Returns the list of schemes registered for "standard" URLs. Note, this
// should not be used if you just need to check if your protocol is standard
// or not. Instead use the IsStandard() function above as its much more
// efficient. This function should only be used where you need to perform
// other operations against the standard scheme list.
COMPONENT_EXPORT(URL)
std::vector<std::string> GetStandardSchemes();
// Adds an application-defined scheme to the internal list of schemes allowed
// for referrers.
COMPONENT_EXPORT(URL)
void AddReferrerScheme(const char* new_scheme, SchemeType scheme_type);
// Adds an application-defined scheme to the list of schemes that do not trigger
// mixed content warnings.
COMPONENT_EXPORT(URL) void AddSecureScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetSecureSchemes();
// Adds an application-defined scheme to the list of schemes that normal pages
// cannot link to or access (i.e., with the same security rules as those applied
// to "file" URLs).
COMPONENT_EXPORT(URL) void AddLocalScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetLocalSchemes();
// Adds an application-defined scheme to the list of schemes that cause pages
// loaded with them to not have access to pages loaded with any other URL
// scheme.
COMPONENT_EXPORT(URL) void AddNoAccessScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetNoAccessSchemes();
// Adds an application-defined scheme to the list of schemes that can be sent
// CORS requests.
COMPONENT_EXPORT(URL) void AddCorsEnabledScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetCorsEnabledSchemes();
// Adds an application-defined scheme to the list of web schemes that can be
// used by web to store data (e.g. cookies, local storage, ...). This is
// to differentiate them from schemes that can store data but are not used on
// web (e.g. application's internal schemes) or schemes that are used on web but
// cannot store data.
COMPONENT_EXPORT(URL) void AddWebStorageScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetWebStorageSchemes();
// Adds an application-defined scheme to the list of schemes that can bypass the
// Content-Security-Policy (CSP) checks.
COMPONENT_EXPORT(URL) void AddCSPBypassingScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetCSPBypassingSchemes();
// Adds an application-defined scheme to the list of schemes that are strictly
// empty documents, allowing them to commit synchronously.
COMPONENT_EXPORT(URL) void AddEmptyDocumentScheme(const char* new_scheme);
COMPONENT_EXPORT(URL) const std::vector<std::string>& GetEmptyDocumentSchemes();
// Adds a scheme with a predefined default handler.
//
// This pair of strings must be normalized protocol handler parameters as
// described in the Custom Handler specification.
// https://html.spec.whatwg.org/multipage/system-state.html#normalize-protocol-handler-parameters
COMPONENT_EXPORT(URL)
void AddPredefinedHandlerScheme(const char* new_scheme, const char* handler);
COMPONENT_EXPORT(URL)
std::vector<std::pair<std::string, std::string>> GetPredefinedHandlerSchemes();
// Sets a flag to prevent future calls to Add*Scheme from succeeding.
//
// This is designed to help prevent errors for multithreaded applications.
// Normal usage would be to call Add*Scheme for your custom schemes at
// the beginning of program initialization, and then LockSchemeRegistries. This
// prevents future callers from mistakenly calling Add*Scheme when the
// program is running with multiple threads, where such usage would be
// dangerous.
//
// We could have had Add*Scheme use a lock instead, but that would add
// some platform-specific dependencies we don't otherwise have now, and is
// overkill considering the normal usage is so simple.
COMPONENT_EXPORT(URL) void LockSchemeRegistries();
// Locates the scheme in the given string and places it into |found_scheme|,
// which may be NULL to indicate the caller does not care about the range.
//
// Returns whether the given |compare| scheme matches the scheme found in the
// input (if any). The |compare| scheme must be a valid canonical scheme or
// the result of the comparison is undefined.
COMPONENT_EXPORT(URL)
bool FindAndCompareScheme(const char* str,
int str_len,
const char* compare,
Component* found_scheme);
COMPONENT_EXPORT(URL)
bool FindAndCompareScheme(const char16_t* str,
int str_len,
const char* compare,
Component* found_scheme);
inline bool FindAndCompareScheme(const std::string& str,
const char* compare,
Component* found_scheme) {
return FindAndCompareScheme(str.data(), static_cast<int>(str.size()),
compare, found_scheme);
}
inline bool FindAndCompareScheme(const std::u16string& str,
const char* compare,
Component* found_scheme) {
return FindAndCompareScheme(str.data(), static_cast<int>(str.size()),
compare, found_scheme);
}
// Returns true if the given scheme identified by |scheme| within |spec| is in
// the list of known standard-format schemes (see AddStandardScheme).
COMPONENT_EXPORT(URL)
bool IsStandard(const char* spec, const Component& scheme);
COMPONENT_EXPORT(URL)
bool IsStandard(const char16_t* spec, const Component& scheme);
// Returns true if the given scheme identified by |scheme| within |spec| is in
// the list of allowed schemes for referrers (see AddReferrerScheme).
COMPONENT_EXPORT(URL)
bool IsReferrerScheme(const char* spec, const Component& scheme);
// Returns true and sets |type| to the SchemeType of the given scheme
// identified by |scheme| within |spec| if the scheme is in the list of known
// standard-format schemes (see AddStandardScheme).
COMPONENT_EXPORT(URL)
bool GetStandardSchemeType(const char* spec,
const Component& scheme,
SchemeType* type);
COMPONENT_EXPORT(URL)
bool GetStandardSchemeType(const char16_t* spec,
const Component& scheme,
SchemeType* type);
// Hosts ----------------------------------------------------------------------
// Returns true if the |canonical_host| matches or is in the same domain as the
// given |canonical_domain| string. For example, if the canonicalized hostname
// is "www.google.com", this will return true for "com", "google.com", and
// "www.google.com" domains.
//
// If either of the input StringPieces is empty, the return value is false. The
// input domain should match host canonicalization rules. i.e. it should be
// lowercase except for escape chars.
COMPONENT_EXPORT(URL)
bool DomainIs(std::string_view canonical_host,
std::string_view canonical_domain);
// Returns true if the hostname is an IP address. Note: this function isn't very
// cheap, as it must re-parse the host to verify.
COMPONENT_EXPORT(URL) bool HostIsIPAddress(std::string_view host);
// URL library wrappers --------------------------------------------------------
// Parses the given spec according to the extracted scheme type. Normal users
// should use the URL object, although this may be useful if performance is
// critical and you don't want to do the heap allocation for the std::string.
//
// As with the Canonicalize* functions, the charset converter can
// be NULL to use UTF-8 (it will be faster in this case).
//
// Returns true if a valid URL was produced, false if not. On failure, the
// output and parsed structures will still be filled and will be consistent,
// but they will not represent a loadable URL.
COMPONENT_EXPORT(URL)
bool Canonicalize(const char* spec,
int spec_len,
bool trim_path_end,
CharsetConverter* charset_converter,
CanonOutput* output,
Parsed* output_parsed);
COMPONENT_EXPORT(URL)
bool Canonicalize(const char16_t* spec,
int spec_len,
bool trim_path_end,
CharsetConverter* charset_converter,
CanonOutput* output,
Parsed* output_parsed);
// Resolves a potentially relative URL relative to the given parsed base URL.
// The base MUST be valid. The resulting canonical URL and parsed information
// will be placed in to the given out variables.
//
// The relative need not be relative. If we discover that it's absolute, this
// will produce a canonical version of that URL. See Canonicalize() for more
// about the charset_converter.
//
// Returns true if the output is valid, false if the input could not produce
// a valid URL.
COMPONENT_EXPORT(URL)
bool ResolveRelative(const char* base_spec,
int base_spec_len,
const Parsed& base_parsed,
const char* relative,
int relative_length,
CharsetConverter* charset_converter,
CanonOutput* output,
Parsed* output_parsed);
COMPONENT_EXPORT(URL)
bool ResolveRelative(const char* base_spec,
int base_spec_len,
const Parsed& base_parsed,
const char16_t* relative,
int relative_length,
CharsetConverter* charset_converter,
CanonOutput* output,
Parsed* output_parsed);
// Replaces components in the given VALID input URL. The new canonical URL info
// is written to output and out_parsed.
//
// Returns true if the resulting URL is valid.
COMPONENT_EXPORT(URL)
bool ReplaceComponents(const char* spec,
int spec_len,
const Parsed& parsed,
const Replacements<char>& replacements,
CharsetConverter* charset_converter,
CanonOutput* output,
Parsed* out_parsed);
COMPONENT_EXPORT(URL)
bool ReplaceComponents(const char* spec,
int spec_len,
const Parsed& parsed,
const Replacements<char16_t>& replacements,
CharsetConverter* charset_converter,
CanonOutput* output,
Parsed* out_parsed);
// String helper functions -----------------------------------------------------
enum class DecodeURLMode {
// UTF-8 decode only. Invalid byte sequences are replaced with U+FFFD.
kUTF8,
// Try UTF-8 decoding. If the input contains byte sequences invalid
// for UTF-8, apply byte to Unicode mapping.
kUTF8OrIsomorphic,
};
// Unescapes the given string using URL escaping rules.
COMPONENT_EXPORT(URL)
void DecodeURLEscapeSequences(std::string_view input,
DecodeURLMode mode,
CanonOutputW* output);
// Escapes the given string as defined by the JS method encodeURIComponent. See
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/encodeURIComponent
COMPONENT_EXPORT(URL)
void EncodeURIComponent(std::string_view input, CanonOutput* output);
// Returns true if `c` is a character that does not require escaping in
// encodeURIComponent.
// TODO(crbug.com/1481056): Remove this when event-level reportEvent is removed
// (if it is still this function's only consumer).
COMPONENT_EXPORT(URL)
bool IsURIComponentChar(char c);
// Checks an arbitrary string for invalid escape sequences.
//
// A valid percent-encoding is '%' followed by exactly two hex-digits. This
// function returns true if an occurrence of '%' is found and followed by
// anything other than two hex-digits.
COMPONENT_EXPORT(URL)
bool HasInvalidURLEscapeSequences(std::string_view input);
} // namespace url
#endif // URL_URL_UTIL_H_