Uri#

Added in version 2.66.

class Uri(*args, **kwargs)#

The GUri type and related functions can be used to parse URIs into their components, and build valid URIs from individual components.

Since GUri only represents absolute URIs, all GUris will have a URI scheme, so get_scheme will always return a non-NULL answer. Likewise, by definition, all URIs have a path component, so get_path will always return a non-NULL string (which may be empty).

If the URI string has an ‘authority’ component (that is, if the scheme is followed by :// rather than just :), then the GUri will contain a hostname, and possibly a port and ‘userinfo’. Additionally, depending on how the GUri was constructed/parsed (for example, using the G_URI_FLAGS_HAS_PASSWORD and G_URI_FLAGS_HAS_AUTH_PARAMS flags), the userinfo may be split out into a username, password, and additional authorization-related parameters.

Normally, the components of a GUri will have all %-encoded characters decoded. However, if you construct/parse a GUri with G_URI_FLAGS_ENCODED, then the %-encoding will be preserved instead in the userinfo, path, and query fields (and in the host field if also created with G_URI_FLAGS_NON_DNS). In particular, this is necessary if the URI may contain binary data or non-UTF-8 text, or if decoding the components might change the interpretation of the URI.

For example, with the encoded flag:

g_autoptr(GUri) uri = g_uri_parse ("http://host/path?query=http%3A%2F%2Fhost%2Fpath%3Fparam%3Dvalue", G_URI_FLAGS_ENCODED, &err);
g_assert_cmpstr (g_uri_get_query (uri), ==, "query=http%3A%2F%2Fhost%2Fpath%3Fparam%3Dvalue");

While the default %-decoding behaviour would give:

g_autoptr(GUri) uri = g_uri_parse ("http://host/path?query=http%3A%2F%2Fhost%2Fpath%3Fparam%3Dvalue", G_URI_FLAGS_NONE, &err);
g_assert_cmpstr (g_uri_get_query (uri), ==, "query=http://host/path?param=value");

During decoding, if an invalid UTF-8 string is encountered, parsing will fail with an error indicating the bad string location:

g_autoptr(GUri) uri = g_uri_parse ("http://host/path?query=http%3A%2F%2Fhost%2Fpath%3Fbad%3D%00alue", G_URI_FLAGS_NONE, &err);
g_assert_error (err, G_URI_ERROR, G_URI_ERROR_BAD_QUERY);

You should pass G_URI_FLAGS_ENCODED or G_URI_FLAGS_ENCODED_QUERY if you need to handle that case manually. In particular, if the query string contains = characters that are %-encoded, you should let parse_params do the decoding once of the query.

GUri is immutable once constructed, and can safely be accessed from multiple threads. Its reference counting is atomic.

Note that the scope of GUri is to help manipulate URIs in various applications, following RFC 3986. In particular, it doesn’t intend to cover web browser needs, and doesn’t implement the WHATWG URL standard. No APIs are provided to help prevent homograph attacks, so GUri is not suitable for formatting URIs for display to the user for making security-sensitive decisions.

Relative and absolute URIs#

As defined in RFC 3986, the hierarchical nature of URIs means that they can either be ‘relative references’ (sometimes referred to as ‘relative URIs’) or ‘URIs’ (for clarity, ‘URIs’ are referred to in this documentation as ‘absolute URIs’ — although in contrast to RFC 3986, fragment identifiers are always allowed).

Relative references have one or more components of the URI missing. In particular, they have no scheme. Any other component, such as hostname, query, etc. may be missing, apart from a path, which has to be specified (but may be empty). The path may be relative, starting with ./ rather than /.

For example, a valid relative reference is ./path?query, /?query#fragment or //example.com.

Absolute URIs have a scheme specified. Any other components of the URI which are missing are specified as explicitly unset in the URI, rather than being resolved relative to a base URI using parse_relative.

For example, a valid absolute URI is file:///home/bob or https://search.com?query=string.

A GUri instance is always an absolute URI. A string may be an absolute URI or a relative reference; see the documentation for individual functions as to what forms they accept.

Parsing URIs#

The most minimalist APIs for parsing URIs are split and split_with_user. These split a URI into its component parts, and return the parts; the difference between the two is that split treats the ‘userinfo’ component of the URI as a single element, while split_with_user can (depending on the UriFlags you pass) treat it as containing a username, password, and authentication parameters. Alternatively, split_network can be used when you are only interested in the components that are needed to initiate a network connection to the service (scheme, host, and port).

parse is similar to split, but instead of returning individual strings, it returns a GUri structure (and it requires that the URI be an absolute URI).

resolve_relative and parse_relative allow you to resolve a relative URI relative to a base URI. resolve_relative takes two strings and returns a string, and parse_relative takes a GUri and a string and returns a GUri.

All of the parsing functions take a UriFlags argument describing exactly how to parse the URI; see the documentation for that type for more details on the specific flags that you can pass. If you need to choose different flags based on the type of URI, you can use peek_scheme on the URI string to check the scheme first, and use that to decide what flags to parse it with.

For example, you might want to use G_URI_PARAMS_WWW_FORM when parsing the params for a web URI, so compare the result of peek_scheme against http and https.

Building URIs#

join and join_with_user can be used to construct valid URI strings from a set of component strings. They are the inverse of split and split_with_user.

Similarly, build and build_with_user can be used to construct a GUri from a set of component strings.

As with the parsing functions, the building functions take a UriFlags argument. In particular, it is important to keep in mind whether the URI components you are using are already %-encoded. If so, you must pass the G_URI_FLAGS_ENCODED flag.

Note that Windows and Unix both define special rules for parsing file:// URIs (involving non-UTF-8 character sets on Unix, and the interpretation of path separators on Windows). GUri does not implement these rules. Use filename_from_uri and filename_to_uri if you want to properly convert between file:// URIs and local filenames.

URI Equality#

Note that there is no g_uri_equal () function, because comparing URIs usefully requires scheme-specific knowledge that GUri does not have. GUri can help with normalization if you use the various encoded UriFlags as well as G_URI_FLAGS_SCHEME_NORMALIZE however it is not comprehensive. For example, data:,foo and data:;base64,Zm9v resolve to the same thing according to the data: URI specification which GLib does not handle.

Methods#

class Uri

classmethod build(scheme: str, userinfo: str | None, host: str | None, port: int, path: str, query: str | None = None, fragment: str | None = None) → Uri#

Creates a new Uri from the given components according to flags.

See also build_with_user(), which allows specifying the components of the “userinfo” separately.

Added in version 2.66.

Parameters:

scheme – the URI scheme
userinfo – the userinfo component, or None
host – the host component, or None
port – the port, or -1
path – the path component
query – the query component, or None
fragment – the fragment, or None

Creates a new Uri from the given components according to flags (HAS_PASSWORD is added unconditionally). The flags must be coherent with the passed values, in particular use %-encoded values with ENCODED.

In contrast to build(), this allows specifying the components of the ‘userinfo’ field separately. Note that user must be non-None if either password or auth_params is non-None.

Added in version 2.66.

Parameters:

scheme – the URI scheme
user – the user component of the userinfo, or None
password – the password component of the userinfo, or None
auth_params – the auth params of the userinfo, or None
host – the host component, or None
port – the port, or -1
path – the path component
query – the query component, or None
fragment – the fragment, or None

classmethod error_quark() → int#

classmethod escape_bytes(reserved_chars_allowed: str | None = None) → str#

Escapes arbitrary data for use in a URI.

Normally all characters that are not ‘unreserved’ (i.e. ASCII alphanumerical characters plus dash, dot, underscore and tilde) are escaped. But if you specify characters in reserved_chars_allowed they are not escaped. This is useful for the ‘reserved’ characters in the URI specification, since those are allowed unescaped in some portions of a URI.

Though technically incorrect, this will also allow escaping nul bytes as %``00.

Added in version 2.66.

Parameters:: reserved_chars_allowed – a string of reserved characters that are allowed to be used, or None.

classmethod escape_string(reserved_chars_allowed: str | None, allow_utf8: bool) → str#

Escapes a string for use in a URI.

Normally all characters that are not “unreserved” (i.e. ASCII alphanumerical characters plus dash, dot, underscore and tilde) are escaped. But if you specify characters in reserved_chars_allowed they are not escaped. This is useful for the “reserved” characters in the URI specification, since those are allowed unescaped in some portions of a URI.

Added in version 2.16.

Parameters:

reserved_chars_allowed – a string of reserved characters that are allowed to be used, or None.
allow_utf8 – True if the result can include UTF-8 characters.

get_auth_params() → str | None#

Gets uri's authentication parameters, which may contain %-encoding, depending on the flags with which uri was created. (If uri was not created with HAS_AUTH_PARAMS then this will be None.)

Depending on the URI scheme, parse_params() may be useful for further parsing this information.

Added in version 2.66.

get_flags() → UriFlags#: Gets uri's flags set upon construction.

Added in version 2.66.

get_fragment() → str | None#: Gets uri's fragment, which may contain %-encoding, depending on the flags with which uri was created.

Added in version 2.66.

get_host() → str | None#

Gets uri's host. This will never have %-encoded characters, unless it is non-UTF-8 (which can only be the case if uri was created with NON_DNS).

If uri contained an IPv6 address literal, this value will be just that address, without the brackets around it that are necessary in the string form of the URI. Note that in this case there may also be a scope ID attached to the address. Eg, fe80::1234%``em1 (or fe80::1234%``25em1 if the string is still encoded).

Added in version 2.66.

get_password() → str | None#: Gets uri's password, which may contain %-encoding, depending on the flags with which uri was created. (If uri was not created with HAS_PASSWORD then this will be None.)

Added in version 2.66.

get_path() → str#: Gets uri's path, which may contain %-encoding, depending on the flags with which uri was created.

Added in version 2.66.

get_port() → int#: Gets uri's port.

Added in version 2.66.

get_query() → str | None#

Gets uri's query, which may contain %-encoding, depending on the flags with which uri was created.

For queries consisting of a series of name=value parameters, UriParamsIter or parse_params() may be useful.

Added in version 2.66.

get_scheme() → str#: Gets uri's scheme. Note that this will always be all-lowercase, regardless of the string or strings that uri was created from.

Added in version 2.66.

get_user() → str | None#: Gets the ‘username’ component of uri's userinfo, which may contain %-encoding, depending on the flags with which uri was created. If uri was not created with HAS_PASSWORD or HAS_AUTH_PARAMS, this is the same as get_userinfo().

Added in version 2.66.

get_userinfo() → str | None#: Gets uri's userinfo, which may contain %-encoding, depending on the flags with which uri was created.

Added in version 2.66.

classmethod is_valid(flags: UriFlags) → bool#

Parses uri_string according to flags, to determine whether it is a valid absolute URI, i.e. it does not need to be resolved relative to another URI using parse_relative().

If it’s not a valid URI, an error is returned explaining how it’s invalid.

See split(), and the definition of UriFlags, for more information on the effect of flags.

Added in version 2.66.

Parameters:: flags – flags for parsing uri_string

Joins the given components together according to flags to create an absolute URI string. path may not be None (though it may be the empty string).

When host is present, path must either be empty or begin with a slash (/) character. When host is not present, path cannot begin with two slash characters (//). See RFC 3986, section 3.

See also join_with_user(), which allows specifying the components of the ‘userinfo’ separately.

HAS_PASSWORD and HAS_AUTH_PARAMS are ignored if set in flags.

Added in version 2.66.

Parameters:

scheme – the URI scheme, or None
userinfo – the userinfo component, or None
host – the host component, or None
port – the port, or -1
path – the path component
query – the query component, or None
fragment – the fragment, or None

Joins the given components together according to flags to create an absolute URI string. path may not be None (though it may be the empty string).

In contrast to join(), this allows specifying the components of the ‘userinfo’ separately. It otherwise behaves the same.

HAS_PASSWORD and HAS_AUTH_PARAMS are ignored if set in flags.

Added in version 2.66.

Parameters:

scheme – the URI scheme, or None
user – the user component of the userinfo, or None
password – the password component of the userinfo, or None
auth_params – the auth params of the userinfo, or None
host – the host component, or None
port – the port, or -1
path – the path component
query – the query component, or None
fragment – the fragment, or None

classmethod list_extract_uris() → list[str]#: Splits an URI list conforming to the text/uri-list mime type defined in RFC 2483 into individual URIs, discarding any comments. The URIs are not validated.

Added in version 2.6.

classmethod parse(flags: UriFlags) → Uri#

Parses uri_string according to flags. If the result is not a valid absolute URI, it will be discarded, and an error returned.

Added in version 2.66.

Parameters:: flags – flags describing how to parse uri_string

classmethod parse_params(length: int, separators: str, flags: UriParamsFlags) → dict[str, str]#

Many URI schemes include one or more attribute/value pairs as part of the URI value. This method can be used to parse them into a hash table. When an attribute has multiple occurrences, the last value is the final returned value. If you need to handle repeated attributes differently, use UriParamsIter.

The params string is assumed to still be %-encoded, but the returned values will be fully decoded. (Thus it is possible that the returned values may contain = or separators, if the value was encoded in the input.) Invalid %-encoding is treated as with the PARSE_RELAXED rules for parse(). (However, if params is the path or query string from a Uri that was parsed without PARSE_RELAXED and ENCODED, then you already know that it does not contain any invalid encoding.)

WWW_FORM is handled as documented for init().

If CASE_INSENSITIVE is passed to flags, attributes will be compared case-insensitively, so a params string attr=123&Attr=456 will only return a single attribute–value pair, Attr=456. Case will be preserved in the returned attributes.

If params cannot be parsed (for example, it contains two separators characters in a row), then error is set and None is returned.

Added in version 2.66.

Parameters:

length – the length of params, or -1 if it is nul-terminated
separators – the separator byte character set between parameters. (usually &, but sometimes ; or both &;). Note that this function works on bytes not characters, so it can’t be used to delimit UTF-8 strings for anything but ASCII characters. You may pass an empty set, in which case no splitting will occur.
flags – flags to modify the way the parameters are handled.

parse_relative(uri_ref: str, flags: UriFlags) → Uri#

Parses uri_ref according to flags and, if it is a relative URI, resolves it relative to base_uri. If the result is not a valid absolute URI, it will be discarded, and an error returned.

Added in version 2.66.

Parameters:

uri_ref – a string representing a relative or absolute URI
flags – flags describing how to parse uri_ref

classmethod parse_scheme() → str | None#

Gets the scheme portion of a URI string. RFC 3986 decodes the scheme as:

URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

Common schemes include file, https, svn+ssh, etc.

Added in version 2.16.

classmethod peek_scheme() → str | None#

Gets the scheme portion of a URI string. RFC 3986 decodes the scheme as:

URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

Common schemes include file, https, svn+ssh, etc.

Unlike parse_scheme(), the returned scheme is normalized to all-lowercase and does not need to be freed.

Added in version 2.66.

classmethod resolve_relative(uri_ref: str, flags: UriFlags) → str#

Parses uri_ref according to flags and, if it is a relative URI, resolves it relative to base_uri_string. If the result is not a valid absolute URI, it will be discarded, and an error returned.

(If base_uri_string is None, this just returns uri_ref, or None if uri_ref is invalid or not absolute.)

Added in version 2.66.

Parameters:

uri_ref – a string representing a relative or absolute URI
flags – flags describing how to parse uri_ref

Parses uri_ref (which can be an absolute or relative URI) according to flags, and returns the pieces. Any component that doesn’t appear in uri_ref will be returned as None (but note that all URIs always have a path component, though it may be the empty string).

If flags contains ENCODED, then %-encoded characters in uri_ref will remain encoded in the output strings. (If not, then all such characters will be decoded.) Note that decoding will only work if the URI components are ASCII or UTF-8, so you will need to use ENCODED if they are not.

Note that the HAS_PASSWORD and HAS_AUTH_PARAMS flags are ignored by split(), since it always returns only the full userinfo; use split_with_user() if you want it split up.

Added in version 2.66.

Parameters:: flags – flags for parsing uri_ref

classmethod split_network(flags: UriFlags) → tuple[bool, str | None, str | None, int]#

Parses uri_string (which must be an absolute URI) according to flags, and returns the pieces relevant to connecting to a host. See the documentation for split() for more details; this is mostly a wrapper around that function with simpler arguments. However, it will return an error if uri_string is a relative URI, or does not contain a hostname component.

Added in version 2.66.

Parameters:: flags – flags for parsing uri_string

See split(), and the definition of UriFlags, for more information on the effect of flags. Note that password will only be parsed out if flags contains HAS_PASSWORD, and auth_params will only be parsed out if flags contains HAS_AUTH_PARAMS.

Added in version 2.66.

Parameters:: flags – flags for parsing uri_ref

to_string() → str#

Returns a string representing uri.

This is not guaranteed to return a string which is identical to the string that uri was parsed from. However, if the source URI was syntactically correct (according to RFC 3986), and it was parsed with ENCODED, then to_string() is guaranteed to return a string which is at least semantically equivalent to the source URI (according to RFC 3986).

If uri might contain sensitive details, such as authentication parameters, or private data in its query string, and the returned string is going to be logged, then consider using to_string_partial() to redact parts.

Added in version 2.66.

to_string_partial(flags: UriHideFlags) → str#

Returns a string representing uri, subject to the options in flags. See to_string() and UriHideFlags for more details.

Added in version 2.66.

Parameters:: flags – flags describing what parts of uri to hide

classmethod unescape_bytes(length: int, illegal_characters: str | None = None) → Bytes#

Unescapes a segment of an escaped string as binary data.

Note that in contrast to unescape_string(), this does allow nul bytes to appear in the output.

If any of the characters in illegal_characters appears as an escaped character in escaped_string, then that is an error and None will be returned. This is useful if you want to avoid for instance having a slash being expanded in an escaped path element, which might confuse pathname handling.

Added in version 2.66.

Parameters:

length – the length (in bytes) of escaped_string to escape, or -1 if it is nul-terminated.
illegal_characters – a string of illegal characters not to be allowed, or None.

classmethod unescape_segment(escaped_string_end: str | None = None, illegal_characters: str | None = None) → str | None#

Unescapes a segment of an escaped string.

If any of the characters in illegal_characters or the NUL character appears as an escaped character in escaped_string, then that is an error and None will be returned. This is useful if you want to avoid for instance having a slash being expanded in an escaped path element, which might confuse pathname handling.

Note: NUL byte is not accepted in the output, in contrast to unescape_bytes().

Added in version 2.16.

Parameters:

escaped_string_end – Pointer to end of escaped_string, may be None
illegal_characters – An optional string of illegal characters not to be allowed, may be None

classmethod unescape_string(illegal_characters: str | None = None) → str | None#

Unescapes a whole escaped string.

Added in version 2.16.

Parameters:: illegal_characters – a string of illegal characters not to be allowed, or None.

Uri#

Relative and absolute URIs#

Parsing URIs#

Building URIs#

URI Equality#

Methods#

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