84 lines
2.8 KiB
Text
84 lines
2.8 KiB
Text
|
= nng_url_parse(3)
|
||
|
|
//
|
||
|
|
// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
|
||
|
|
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
|
||
|
|
//
|
||
|
|
// This document is supplied under the terms of the MIT License, a
|
||
|
|
// copy of which should be located in the distribution where this
|
||
|
|
// file was obtained (LICENSE.txt). A copy of the license may also be
|
||
|
|
// found online at https://opensource.org/licenses/MIT.
|
||
|
|
//
|
||
|
|
|
||
|
|
== NAME
|
||
|
|
|
||
|
|
nng_url_parse - create URL structure from a string
|
||
|
|
|
||
|
|
== SYNOPSIS
|
||
|
|
|
||
|
|
[source, c]
|
||
|
|
----
|
||
|
|
#include <nng/nng.h>
|
||
|
|
|
||
|
|
int nng_url_parse(nng_url **urlp, const char *str);
|
||
|
|
----
|
||
|
|
|
||
|
|
== DESCRIPTION
|
||
|
|
|
||
|
|
The `nng_url_parse()` function parses the string _str_ containing an
|
||
|
|
https://tools.ietf.org/html/rfc3986[RFC 3986] compliant URL, and creates
|
||
|
|
an
|
||
|
|
xref:nng_url.5.adoc[`nng_url`] structure containing the results.
|
||
|
|
A pointer to the resulting structure is stored in _urlp_.
|
||
|
|
|
||
|
|
The structure may disposed of when no longer needed by calling
|
||
|
|
xref:nng_url_free.3.adoc[`nng_url_free()`].
|
||
|
|
|
||
|
|
=== URL Canonicalization
|
||
|
|
|
||
|
|
The `nng_url_parse()` function also canonicalizes the results, as
|
||
|
|
follows:
|
||
|
|
|
||
|
|
1. The URL is parsed into the various components.
|
||
|
|
2. The `u_scheme`, `u_hostname`, `u_host`, and `u_port` members are
|
||
|
|
converted to lower case.
|
||
|
|
3. Percent-encoded values for
|
||
|
|
https://tools.ietf.org/html/rfc3986#section-2.3[unreserved characters]
|
||
|
|
converted to their unencoded forms.
|
||
|
|
4. Additionally URL percent-encoded values for characters in the path
|
||
|
|
and with numeric values larger than 127 (i.e. not ASCII) are decoded.
|
||
|
|
5. The resulting `u_path` is checked for invalid UTF-8 sequences, consisting
|
||
|
|
of surrogate pairs, illegal byte sequences, or overlong encodings.
|
||
|
|
If this check fails, then the entire URL is considered invalid, and
|
||
|
|
the function returns `NNG_EINVAL`.
|
||
|
|
6. Path segments consisting of `.` and `..` are resolved as per
|
||
|
|
https://tools.ietf.org/html/rfc3986#section-6.2.2.3[RFC 3986 6.2.2.3].
|
||
|
|
7. Further, empty path segments are removed, meaning that duplicate
|
||
|
|
slash (`/`) separators are removed from the path.
|
||
|
|
8. If a port was not specified, but the scheme defines a default
|
||
|
|
port, then `u_port` will be filled in with the value of the default port.
|
||
|
|
|
||
|
|
TIP: Only the `u_userinfo`, `u_query`, and `u_fragment` members will ever be
|
||
|
|
`NULL`. The other members will be filled in with either default values
|
||
|
|
or the empty string if they cannot be determined from _str_.
|
||
|
|
|
||
|
|
== RETURN VALUES
|
||
|
|
|
||
|
|
This function returns 0 on success, and non-zero otherwise.
|
||
|
|
|
||
|
|
|
||
|
|
== ERRORS
|
||
|
|
|
||
|
|
[horizontal]
|
||
|
|
`NNG_ENOMEM`:: Insufficient free memory exists to allocate a message.
|
||
|
|
`NNG_EINVAL`:: An invalid URL was supplied.
|
||
|
|
|
||
|
|
|
||
|
|
== SEE ALSO
|
||
|
|
|
||
|
|
[.text-left]
|
||
|
|
xref:nng_url_clone.3.adoc[nng_url_clone(3)],
|
||
|
|
xref:nng_url_free.3.adoc[nng_url_free(3)],
|
||
|
|
xref:nng_strerror.3.adoc[nng_strerror(3)],
|
||
|
|
xref:nng_url.5.adoc[nng_url(5)],
|
||
|
|
xref:nng.7.adoc[nng(7)]
|