| // Copyright 2013 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. |
| |
| #ifndef URL_GURL_H_ |
| #define URL_GURL_H_ |
| |
| #include <stddef.h> |
| |
| #include <iosfwd> |
| #include <memory> |
| #include <string> |
| |
| #include "base/component_export.h" |
| #include "base/debug/alias.h" |
| #include "base/strings/string_piece.h" |
| #include "third_party/perfetto/include/perfetto/tracing/traced_value_forward.h" |
| #include "url/third_party/mozilla/url_parse.h" |
| #include "url/url_canon.h" |
| #include "url/url_canon_stdstring.h" |
| #include "url/url_constants.h" |
| |
| // Represents a URL. GURL is Google's URL parsing library. |
| // |
| // A parsed canonicalized URL is guaranteed to be UTF-8. Any non-ASCII input |
| // characters are UTF-8 encoded and % escaped to ASCII. |
| // |
| // The string representation of a URL is called the spec(). Getting the |
| // spec will assert if the URL is invalid to help protect against malicious |
| // URLs. If you want the "best effort" canonicalization of an invalid URL, you |
| // can use possibly_invalid_spec(). Test validity with is_valid(). Data and |
| // javascript URLs use GetContent() to extract the data. |
| // |
| // This class has existence checkers and getters for the various components of |
| // a URL. Existence is different than being nonempty. "http://www.google.com/?" |
| // has a query that just happens to be empty, and has_query() will return true |
| // while the query getters will return the empty string. |
| // |
| // Prefer not to modify a URL using string operations (though sometimes this is |
| // unavoidable). Instead, use ReplaceComponents which can replace or delete |
| // multiple parts of a URL in one step, doesn't re-canonicalize unchanged |
| // sections, and avoids some screw-ups. An example is creating a URL with a |
| // path that contains a literal '#'. Using string concatenation will generate a |
| // URL with a truncated path and a reference fragment, while ReplaceComponents |
| // will know to escape this and produce the desired result. |
| class COMPONENT_EXPORT(URL) GURL { |
| public: |
| typedef url::StringPieceReplacements<char> Replacements; |
| typedef url::StringPieceReplacements<char16_t> ReplacementsW; |
| |
| // Creates an empty, invalid URL. |
| GURL(); |
| |
| // Copy construction is relatively inexpensive, with most of the time going |
| // to reallocating the string. It does not re-parse. |
| GURL(const GURL& other); |
| GURL(GURL&& other) noexcept; |
| |
| // The strings to this contructor should be UTF-8 / UTF-16. |
| explicit GURL(base::StringPiece url_string); |
| explicit GURL(base::StringPiece16 url_string); |
| |
| // Constructor for URLs that have already been parsed and canonicalized. This |
| // is used for conversions from KURL, for example. The caller must supply all |
| // information associated with the URL, which must be correct and consistent. |
| GURL(const char* canonical_spec, |
| size_t canonical_spec_len, |
| const url::Parsed& parsed, |
| bool is_valid); |
| // Notice that we take the canonical_spec by value so that we can convert |
| // from WebURL without copying the string. When we call this constructor |
| // we pass in a temporary std::string, which lets the compiler skip the |
| // copy and just move the std::string into the function argument. In the |
| // implementation, we use std::move to move the data into the GURL itself, |
| // which means we end up with zero copies. |
| GURL(std::string canonical_spec, const url::Parsed& parsed, bool is_valid); |
| |
| ~GURL(); |
| |
| GURL& operator=(const GURL& other); |
| GURL& operator=(GURL&& other) noexcept; |
| |
| // Returns true when this object represents a valid parsed URL. When not |
| // valid, other functions will still succeed, but you will not get canonical |
| // data out in the format you may be expecting. Instead, we keep something |
| // "reasonable looking" so that the user can see how it's busted if |
| // displayed to them. |
| bool is_valid() const { |
| return is_valid_; |
| } |
| |
| // Returns true if the URL is zero-length. Note that empty URLs are also |
| // invalid, and is_valid() will return false for them. This is provided |
| // because some users may want to treat the empty case differently. |
| bool is_empty() const { |
| return spec_.empty(); |
| } |
| |
| // Returns the raw spec, i.e., the full text of the URL, in canonical UTF-8, |
| // if the URL is valid. If the URL is not valid, this will assert and return |
| // the empty string (for safety in release builds, to keep them from being |
| // misused which might be a security problem). |
| // |
| // The URL will be ASCII (non-ASCII characters will be %-escaped UTF-8). |
| // |
| // The exception is for empty() URLs (which are !is_valid()) but this will |
| // return the empty string without asserting. |
| // |
| // Use invalid_spec() below to get the unusable spec of an invalid URL. This |
| // separation is designed to prevent errors that may cause security problems |
| // that could result from the mistaken use of an invalid URL. |
| const std::string& spec() const; |
| |
| // Returns the potentially invalid spec for a the URL. This spec MUST NOT be |
| // modified or sent over the network. It is designed to be displayed in error |
| // messages to the user, as the appearance of the spec may explain the error. |
| // If the spec is valid, the valid spec will be returned. |
| // |
| // The returned string is guaranteed to be valid UTF-8. |
| const std::string& possibly_invalid_spec() const { |
| return spec_; |
| } |
| |
| // Getter for the raw parsed structure. This allows callers to locate parts |
| // of the URL within the spec themselves. Most callers should consider using |
| // the individual component getters below. |
| // |
| // The returned parsed structure will reference into the raw spec, which may |
| // or may not be valid. If you are using this to index into the spec, BE |
| // SURE YOU ARE USING possibly_invalid_spec() to get the spec, and that you |
| // don't do anything "important" with invalid specs. |
| const url::Parsed& parsed_for_possibly_invalid_spec() const { |
| return parsed_; |
| } |
| |
| // Allows GURL to used as a key in STL (for example, a std::set or std::map). |
| bool operator<(const GURL& other) const; |
| bool operator>(const GURL& other) const; |
| |
| // Resolves a URL that's possibly relative to this object's URL, and returns |
| // it. Absolute URLs are also handled according to the rules of URLs on web |
| // pages. |
| // |
| // It may be impossible to resolve the URLs properly. If the input is not |
| // "standard" (IsStandard() == false) and the input looks relative, we can't |
| // resolve it. In these cases, the result will be an empty, invalid GURL. |
| // |
| // The result may also be a nonempty, invalid URL if the input has some kind |
| // of encoding error. In these cases, we will try to construct a "good" URL |
| // that may have meaning to the user, but it will be marked invalid. |
| // |
| // It is an error to resolve a URL relative to an invalid URL. The result |
| // will be the empty URL. |
| GURL Resolve(base::StringPiece relative) const; |
| GURL Resolve(base::StringPiece16 relative) const; |
| |
| // Creates a new GURL by replacing the current URL's components with the |
| // supplied versions. See the Replacements class in url_canon.h for more. |
| // |
| // These are not particularly quick, so avoid doing mutations when possible. |
| // Prefer the 8-bit version when possible. |
| // |
| // It is an error to replace components of an invalid URL. The result will |
| // be the empty URL. |
| // |
| // Note that we use the more general url::Replacements type to give |
| // callers extra flexibility rather than our override. |
| GURL ReplaceComponents(const url::Replacements<char>& replacements) const; |
| GURL ReplaceComponents(const url::Replacements<char16_t>& replacements) const; |
| |
| // A helper function that is equivalent to replacing the path with a slash |
| // and clearing out everything after that. We sometimes need to know just the |
| // scheme and the authority. If this URL is not a standard URL (it doesn't |
| // have the regular authority and path sections), then the result will be |
| // an empty, invalid GURL. Note that this *does* work for file: URLs, which |
| // some callers may want to filter out before calling this. |
| // |
| // It is an error to get an empty path on an invalid URL. The result |
| // will be the empty URL. |
| GURL GetWithEmptyPath() const; |
| |
| // A helper function to return a GURL without the filename, query values, and |
| // fragment. For example, |
| // GURL("https://www.foo.com/index.html?q=test").GetWithoutFilename().spec() |
| // will return "https://www.foo.com/". |
| // GURL("https://www.foo.com/bar/").GetWithoutFilename().spec() |
| // will return "https://www.foo.com/bar/". If the GURL is invalid or missing a |
| // scheme, authority or path, it will return an empty, invalid GURL. |
| GURL GetWithoutFilename() const; |
| |
| // A helper function to return a GURL containing just the scheme, host, |
| // and port from a URL. Equivalent to clearing any username and password, |
| // replacing the path with a slash, and clearing everything after that. If |
| // this URL is not a standard URL, then the result will be an empty, |
| // invalid GURL. If the URL has neither username nor password, this |
| // degenerates to GetWithEmptyPath(). |
| // |
| // It is an error to get the origin of an invalid URL. The result |
| // will be the empty URL. |
| // |
| // WARNING: Please avoid converting urls into origins if at all possible! |
| // //docs/security/origin-vs-url.md is a list of gotchas that can result. Such |
| // conversions will likely return a wrong result for about:blank and/or |
| // in the presence of iframe.sandbox attribute. Prefer to get origins directly |
| // from the source (e.g. RenderFrameHost::GetLastCommittedOrigin). |
| GURL DeprecatedGetOriginAsURL() const; |
| |
| // A helper function to return a GURL stripped from the elements that are not |
| // supposed to be sent as HTTP referrer: username, password and ref fragment. |
| // For invalid URLs or URLs that no valid referrers, an empty URL will be |
| // returned. |
| GURL GetAsReferrer() const; |
| |
| // Returns true if the scheme for the current URL is a known "standard-format" |
| // scheme. A standard-format scheme adheres to what RFC 3986 calls "generic |
| // URI syntax" (https://tools.ietf.org/html/rfc3986#section-3). This includes |
| // file: and filesystem:, which some callers may want to filter out explicitly |
| // by calling SchemeIsFile[System]. |
| bool IsStandard() const; |
| |
| // Returns true when the url is of the form about:blank, about:blank?foo or |
| // about:blank/#foo. |
| bool IsAboutBlank() const; |
| |
| // Returns true when the url is of the form about:srcdoc, about:srcdoc?foo or |
| // about:srcdoc/#foo. |
| bool IsAboutSrcdoc() const; |
| |
| // Returns true if the given parameter (should be lower-case ASCII to match |
| // the canonicalized scheme) is the scheme for this URL. Do not include a |
| // colon. |
| bool SchemeIs(base::StringPiece lower_ascii_scheme) const; |
| |
| // Returns true if the scheme is "http" or "https". |
| bool SchemeIsHTTPOrHTTPS() const; |
| |
| // Returns true is the scheme is "ws" or "wss". |
| bool SchemeIsWSOrWSS() const; |
| |
| // We often need to know if this is a file URL. File URLs are "standard", but |
| // are often treated separately by some programs. |
| bool SchemeIsFile() const { |
| return SchemeIs(url::kFileScheme); |
| } |
| |
| // FileSystem URLs need to be treated differently in some cases. |
| bool SchemeIsFileSystem() const { |
| return SchemeIs(url::kFileSystemScheme); |
| } |
| |
| // Returns true if the scheme indicates a network connection that uses TLS or |
| // some other cryptographic protocol (e.g. QUIC) for security. |
| // |
| // This function is a not a complete test of whether or not an origin's code |
| // is minimally trustworthy. For that, see Chromium's |IsOriginSecure| for a |
| // higher-level and more complete semantics. See that function's documentation |
| // for more detail. |
| bool SchemeIsCryptographic() const; |
| |
| // As above, but static. Parameter should be lower-case ASCII. |
| static bool SchemeIsCryptographic(base::StringPiece lower_ascii_scheme); |
| |
| // Returns true if the scheme is "blob". |
| bool SchemeIsBlob() const { |
| return SchemeIs(url::kBlobScheme); |
| } |
| |
| // For most URLs, the "content" is everything after the scheme (skipping the |
| // scheme delimiting colon) and before the fragment (skipping the fragment |
| // delimiting octothorpe). For javascript URLs the "content" also includes the |
| // fragment delimiter and fragment. |
| // |
| // It is an error to get the content of an invalid URL: the result will be an |
| // empty string. |
| std::string GetContent() const; |
| |
| // Returns true if the hostname is an IP address. Note: this function isn't |
| // as cheap as a simple getter because it re-parses the hostname to verify. |
| bool HostIsIPAddress() const; |
| |
| // Not including the colon. If you are comparing schemes, prefer SchemeIs. |
| bool has_scheme() const { |
| return parsed_.scheme.len >= 0; |
| } |
| std::string scheme() const { |
| return ComponentString(parsed_.scheme); |
| } |
| base::StringPiece scheme_piece() const { |
| return ComponentStringPiece(parsed_.scheme); |
| } |
| |
| bool has_username() const { |
| return parsed_.username.len >= 0; |
| } |
| std::string username() const { |
| return ComponentString(parsed_.username); |
| } |
| base::StringPiece username_piece() const { |
| return ComponentStringPiece(parsed_.username); |
| } |
| |
| bool has_password() const { |
| return parsed_.password.len >= 0; |
| } |
| std::string password() const { |
| return ComponentString(parsed_.password); |
| } |
| base::StringPiece password_piece() const { |
| return ComponentStringPiece(parsed_.password); |
| } |
| |
| // The host may be a hostname, an IPv4 address, or an IPv6 literal surrounded |
| // by square brackets, like "[2001:db8::1]". To exclude these brackets, use |
| // HostNoBrackets() below. |
| bool has_host() const { |
| // Note that hosts are special, absence of host means length 0. |
| return parsed_.host.len > 0; |
| } |
| std::string host() const { |
| return ComponentString(parsed_.host); |
| } |
| base::StringPiece host_piece() const { |
| return ComponentStringPiece(parsed_.host); |
| } |
| |
| // The port if one is explicitly specified. Most callers will want IntPort() |
| // or EffectiveIntPort() instead of these. The getters will not include the |
| // ':'. |
| bool has_port() const { |
| return parsed_.port.len >= 0; |
| } |
| std::string port() const { |
| return ComponentString(parsed_.port); |
| } |
| base::StringPiece port_piece() const { |
| return ComponentStringPiece(parsed_.port); |
| } |
| |
| // Including first slash following host, up to the query. The URL |
| // "http://www.google.com/" has a path of "/". |
| bool has_path() const { |
| return parsed_.path.len >= 0; |
| } |
| std::string path() const { |
| return ComponentString(parsed_.path); |
| } |
| base::StringPiece path_piece() const { |
| return ComponentStringPiece(parsed_.path); |
| } |
| |
| // Stuff following '?' up to the ref. The getters will not include the '?'. |
| bool has_query() const { |
| return parsed_.query.len >= 0; |
| } |
| std::string query() const { |
| return ComponentString(parsed_.query); |
| } |
| base::StringPiece query_piece() const { |
| return ComponentStringPiece(parsed_.query); |
| } |
| |
| // Stuff following '#' to the end of the string. This will be %-escaped UTF-8. |
| // The getters will not include the '#'. |
| bool has_ref() const { |
| return parsed_.ref.len >= 0; |
| } |
| std::string ref() const { |
| return ComponentString(parsed_.ref); |
| } |
| base::StringPiece ref_piece() const { |
| return ComponentStringPiece(parsed_.ref); |
| } |
| |
| // Returns a parsed version of the port. Can also be any of the special |
| // values defined in Parsed for ExtractPort. |
| int IntPort() const; |
| |
| // Returns the port number of the URL, or the default port number. |
| // If the scheme has no concept of port (or unknown default) returns |
| // PORT_UNSPECIFIED. |
| int EffectiveIntPort() const; |
| |
| // Extracts the filename portion of the path and returns it. The filename |
| // is everything after the last slash in the path. This may be empty. |
| std::string ExtractFileName() const; |
| |
| // Returns the path that should be sent to the server. This is the path, |
| // parameter, and query portions of the URL. It is guaranteed to be ASCII. |
| std::string PathForRequest() const; |
| |
| // Returns the same characters as PathForRequest(), avoiding a copy. |
| base::StringPiece PathForRequestPiece() const; |
| |
| // Returns the host, excluding the square brackets surrounding IPv6 address |
| // literals. This can be useful for passing to getaddrinfo(). |
| std::string HostNoBrackets() const; |
| |
| // Returns the same characters as HostNoBrackets(), avoiding a copy. |
| base::StringPiece HostNoBracketsPiece() const; |
| |
| // Returns true if this URL's host matches or is in the same domain as |
| // the given input string. For example, if the hostname of the URL is |
| // "www.google.com", this will return true for "com", "google.com", and |
| // "www.google.com". |
| // |
| // The input domain should match host canonicalization rules. i.e. the input |
| // should be lowercase except for escape chars. |
| // |
| // This call is more efficient than getting the host and checking whether the |
| // host has the specific domain or not because no copies or object |
| // constructions are done. |
| bool DomainIs(base::StringPiece canonical_domain) const; |
| |
| // Checks whether or not two URLs differ only in the ref (the part after |
| // the # character). |
| bool EqualsIgnoringRef(const GURL& other) const; |
| |
| // Swaps the contents of this GURL object with |other|, without doing |
| // any memory allocations. |
| void Swap(GURL* other); |
| |
| // Returns a reference to a singleton empty GURL. This object is for callers |
| // who return references but don't have anything to return in some cases. |
| // If you just want an empty URL for normal use, prefer GURL(). This function |
| // may be called from any thread. |
| static const GURL& EmptyGURL(); |
| |
| // Returns the inner URL of a nested URL (currently only non-null for |
| // filesystem URLs). |
| // |
| // TODO(mmenke): inner_url().spec() currently returns the same value as |
| // caling spec() on the GURL itself. This should be fixed. |
| // See https://crbug.com/619596 |
| const GURL* inner_url() const { |
| return inner_url_.get(); |
| } |
| |
| // Estimates dynamic memory usage. |
| // See base/trace_event/memory_usage_estimator.h for more info. |
| size_t EstimateMemoryUsage() const; |
| |
| // Helper used by GURL::IsAboutUrl and KURL::IsAboutURL. |
| static bool IsAboutPath(base::StringPiece actual_path, |
| base::StringPiece allowed_path); |
| |
| void WriteIntoTrace(perfetto::TracedValue context) const; |
| |
| private: |
| // Variant of the string parsing constructor that allows the caller to elect |
| // retain trailing whitespace, if any, on the passed URL spec, but only if |
| // the scheme is one that allows trailing whitespace. The primary use-case is |
| // for data: URLs. In most cases, you want to use the single parameter |
| // constructor above. |
| enum RetainWhiteSpaceSelector { RETAIN_TRAILING_PATH_WHITEPACE }; |
| GURL(const std::string& url_string, RetainWhiteSpaceSelector); |
| |
| template <typename T, typename CharT = typename T::value_type> |
| void InitCanonical(T input_spec, bool trim_path_end); |
| |
| void InitializeFromCanonicalSpec(); |
| |
| // Helper used by IsAboutBlank and IsAboutSrcdoc. |
| bool IsAboutUrl(base::StringPiece allowed_path) const; |
| |
| // Returns the substring of the input identified by the given component. |
| std::string ComponentString(const url::Component& comp) const { |
| if (comp.len <= 0) |
| return std::string(); |
| return std::string(spec_, comp.begin, comp.len); |
| } |
| base::StringPiece ComponentStringPiece(const url::Component& comp) const { |
| if (comp.len <= 0) |
| return base::StringPiece(); |
| return base::StringPiece(&spec_[comp.begin], comp.len); |
| } |
| |
| void ProcessFileSystemURLAfterReplaceComponents(); |
| |
| // The actual text of the URL, in canonical ASCII form. |
| std::string spec_; |
| |
| // Set when the given URL is valid. Otherwise, we may still have a spec and |
| // components, but they may not identify valid resources (for example, an |
| // invalid port number, invalid characters in the scheme, etc.). |
| bool is_valid_; |
| |
| // Identified components of the canonical spec. |
| url::Parsed parsed_; |
| |
| // Used for nested schemes [currently only filesystem:]. |
| std::unique_ptr<GURL> inner_url_; |
| }; |
| |
| // Stream operator so GURL can be used in assertion statements. |
| COMPONENT_EXPORT(URL) |
| std::ostream& operator<<(std::ostream& out, const GURL& url); |
| |
| COMPONENT_EXPORT(URL) bool operator==(const GURL& x, const GURL& y); |
| COMPONENT_EXPORT(URL) bool operator!=(const GURL& x, const GURL& y); |
| |
| // Equality operator for comparing raw spec_. This should be used in place of |
| // url == GURL(spec) where |spec| is known (i.e. constants). This is to prevent |
| // needlessly re-parsing |spec| into a temporary GURL. |
| COMPONENT_EXPORT(URL) |
| bool operator==(const GURL& x, const base::StringPiece& spec); |
| COMPONENT_EXPORT(URL) |
| bool operator==(const base::StringPiece& spec, const GURL& x); |
| COMPONENT_EXPORT(URL) |
| bool operator!=(const GURL& x, const base::StringPiece& spec); |
| COMPONENT_EXPORT(URL) |
| bool operator!=(const base::StringPiece& spec, const GURL& x); |
| |
| // DEBUG_ALIAS_FOR_GURL(var_name, url) copies |url| into a new stack-allocated |
| // variable named |<var_name>|. This helps ensure that the value of |url| gets |
| // preserved in crash dumps. |
| #define DEBUG_ALIAS_FOR_GURL(var_name, url) \ |
| DEBUG_ALIAS_FOR_CSTR(var_name, (url).possibly_invalid_spec().c_str(), 128) |
| |
| #endif // URL_GURL_H_ |