<?php
/**
* Edited by Nitin Kr. Gupta, publicmind.in
*/
/**
* Copyright (c) 2008, David R. Nadeau, NadeauSoftware.com.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the names of David R. Nadeau or NadeauSoftware.com, nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
/*
* This is a BSD License approved by the Open Source Initiative (OSI).
* See: http://www.opensource.org/licenses/bsd-license.php
*/
/**
* Combine a base URL and a relative URL to produce a new
* absolute URL. The base URL is often the URL of a page,
* and the relative URL is a URL embedded on that page.
*
* This function implements the "absolutize" algorithm from
* the RFC3986 specification for URLs.
*
* This function supports multi-byte characters with the UTF-8 encoding,
* per the URL specification.
*
* Parameters:
* baseUrl the absolute base URL.
*
* url the relative URL to convert.
*
* Return values:
* An absolute URL that combines parts of the base and relative
* URLs, or FALSE if the base URL is not absolute or if either
* URL cannot be parsed.
*/
function url_to_absolute($baseUrl, $relativeUrl)
{
// If relative URL has a scheme, clean path and return.
$r = split_url($relativeUrl);
if ($r === FALSE)
{
return FALSE;
}
if (! empty($r['scheme']))
{
if (! empty($r['path']) && $r['path'][0] == '/')
{
$r['path'] = url_remove_dot_segments($r['path']);
}
return join_url($r);
}
// Make sure the base URL is absolute.
$b = split_url($baseUrl);
if ($b === FALSE || empty($b['scheme']) || empty($b['host']))
{
return FALSE;
}
$r['scheme'] = $b['scheme'];
// If relative URL has an authority, clean path and return.
if (isset($r['host']))
{
if (! empty($r['path']))
{
$r['path'] = url_remove_dot_segments($r['path']);
}
return join_url($r);
}
unset($r['port']);
unset($r['user']);
unset($r['pass']);
// Copy base authority.
$r['host'] = $b['host'];
if (isset($b['port']))
{
$r['port'] = $b['port'];
}
if (isset($b['user']))
{
$r['user'] = $b['user'];
}
if (isset($b['pass']))
{
$r['pass'] = $b['pass'];
}
// If relative URL has no path, use base path
if (empty($r['path']))
{
if (! empty($b['path']))
{
$r['path'] = $b['path'];
}
if (! isset($r['query']) && isset($b['query']))
{
$r['query'] = $b['query'];
}
return join_url($r);
}
// If relative URL path doesn't start with /, merge with base path
if (isset($b['path']) && $r['path'][0] != '/')
{
$base = mb_strrchr($b['path'], '/', TRUE, 'UTF-8');
if ($base === FALSE)
{
$base = '';
}
$r['path'] = $base . '/' . $r['path'];
}
$r['path'] = url_remove_dot_segments($r['path']);
return join_url($r);
}
/**
* Filter out "." and ".." segments from a URL's path and return
* the result.
*
* This function implements the "remove_dot_segments" algorithm from
* the RFC3986 specification for URLs.
*
* This function supports multi-byte characters with the UTF-8 encoding,
* per the URL specification.
*
* Parameters:
* path the path to filter
*
* Return values:
* The filtered path with "." and ".." removed.
*/
function url_remove_dot_segments($path)
{
// multi-byte character explode
$inSegs = preg_split('!/!u', $path);
$outSegs = array();
foreach ($inSegs as $seg)
{
if ($seg == '' || $seg == '.')
{
continue;
}
if ($seg == '..')
{
array_pop($outSegs);
}
else
{
array_push($outSegs, $seg);
}
}
$outPath = implode('/', $outSegs);
if ($path[0] == '/')
{
$outPath = '/' . $outPath;
}
// compare last multi-byte character against '/'
if ($outPath != '/' &&
(mb_strlen($path) - 1) == mb_strrpos($path, '/', 'UTF-8')
)
{
$outPath .= '/';
}
return $outPath;
}
/**
* This function parses an absolute or relative URL and splits it
* into individual components.
*
* RFC3986 specifies the components of a Uniform Resource Identifier (URI).
* A portion of the ABNFs are repeated here:
*
* URI-reference = URI
* / relative-ref
*
* URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
*
* relative-ref = relative-part [ "?" query ] [ "#" fragment ]
*
* hier-part = "//" authority path-abempty
* / path-absolute
* / path-rootless
* / path-empty
*
* relative-part = "//" authority path-abempty
* / path-absolute
* / path-noscheme
* / path-empty
*
* authority = [ userinfo "@" ] host [ ":" port ]
*
* So, a URL has the following major components:
*
* scheme
* The name of a method used to interpret the rest of
* the URL. Examples: "http", "https", "mailto", "file'.
*
* authority
* The name of the authority governing the URL's name
* space. Examples: "example.com", "user@example.com",
* "example.com:80", "user:password@example.com:80".
*
* The authority may include a host name, port number,
* user name, and password.
*
* The host may be a name, an IPv4 numeric address, or
* an IPv6 numeric address.
*
* path
* The hierarchical path to the URL's resource.
* Examples: "/index.htm", "/scripts/page.php".
*
* query
* The data for a query. Examples: "?search=google.com".
*
* fragment
* The name of a secondary resource relative to that named
* by the path. Examples: "#section1", "#header".
*
* An "absolute" URL must include a scheme and path. The authority, query,
* and fragment components are optional.
*
* A "relative" URL does not include a scheme and must include a path. The
* authority, query, and fragment components are optional.
*
* This function splits the $url argument into the following components
* and returns them in an associative array. Keys to that array include:
*
* "scheme" The scheme, such as "http".
* "host" The host name, IPv4, or IPv6 address.
* "port" The port number.
* "user" The user name.
* "pass" The user password.
* "path" The path, such as a file path for "http".
* "query" The query.
* "fragment" The fragment.
*
* One or more of these may not be present, depending upon the URL.
*
* Optionally, the "user", "pass", "host" (if a name, not an IP address),
* "path", "query", and "fragment" may have percent-encoded characters
* decoded. The "scheme" and "port" cannot include percent-encoded
* characters and are never decoded. Decoding occurs after the URL has
* been parsed.
*
* Parameters:
* url the URL to parse.
*
* decode an optional boolean flag selecting whether
* to decode percent encoding or not. Default = TRUE.
*
* Return values:
* the associative array of URL parts, or FALSE if the URL is
* too malformed to recognize any parts.
*/
function split_url($url, $decode = FALSE)
{
$parts = array();
// Character sets from RFC3986.
$xunressub = 'a-zA-Z\d\-._~\!$&\'()*+,;=';
$xpchar = $xunressub . ':@% ';
// Scheme from RFC3986.
$xscheme = '([a-zA-Z][a-zA-Z\d+-.]*)';
// User info (user + password) from RFC3986.
$xuserinfo = '(([' . $xunressub . '%]*)' .
'(:([' . $xunressub . ':%]*))?)';
// IPv4 from RFC3986 (without digit constraints).
$xipv4 = '(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})';
// IPv6 from RFC2732 (without digit and grouping constraints).
$xipv6 = '(\[([a-fA-F\d.:]+)\])';
// Host name from RFC1035. Technically, must start with a letter.
// Relax that restriction to better parse URL structure, then
// leave host name validation to application.
$xhost_name = '([a-zA-Z\d-.%]+)';
// Authority from RFC3986. Skip IP future.
$xhost = '(' . $xhost_name . '|' . $xipv4 . '|' . $xipv6 . ')';
$xport = '(\d*)';
$xauthority = '((' . $xuserinfo . '@)?' . $xhost .
'?(:' . $xport . ')?)';
// Path from RFC3986. Blend absolute & relative for efficiency.
$xslash_seg = '(/[' . $xpchar . ']*)';
$xpath_authabs = '((//' . $xauthority . ')((/[' . $xpchar . ']*)*))';
$xpath_rel = '([' . $xpchar . ']+' . $xslash_seg . '*)';
$xpath_abs = '(/(' . $xpath_rel . ')?)';
$xapath = '(' . $xpath_authabs . '|' . $xpath_abs .
'|' . $xpath_rel . ')';
// Query and fragment from RFC3986.
$xqueryfrag = '([' . $xpchar . '/?' . ']*)';
// URL.
$xurl = '^(' . $xscheme . ':)?' . $xapath . '?' .
'(\?' . $xqueryfrag . ')?(#' . $xqueryfrag . ')?$';
// Split the URL into components.
if (! preg_match('!' . $xurl . '!', $url, $m))
{
return FALSE;
}
if (! empty($m[2]))
{
$parts['scheme'] = strtolower($m[2]);
}
if (! empty($m[7]))
{
if (isset($m[9]))
{
$parts['user'] = $m[9];
}
else
{
$parts['user'] = '';
}
}
if (! empty($m[10]))
{
$parts['pass'] = $m[11];
}
if (! empty($m[13]))
{
$h = $parts['host'] = $m[13];
}
else
{
if (! empty($m[14]))
{
$parts['host'] = $m[14];
}
else
{
if (! empty($m[16]))
{
$parts['host'] = $m[16];
}
else
{
if (! empty($m[5]))
{
$parts['host'] = '';
}
}
}
}
if (! empty($m[17]))
{
$parts['port'] = $m[18];
}
if (! empty($m[19]))
{
$parts['path'] = $m[19];
}
else
{
if (! empty($m[21]))
{
$parts['path'] = $m[21];
}
else
{
if (! empty($m[25]))
{
$parts['path'] = $m[25];
}
}
}
if (! empty($m[27]))
{
$parts['query'] = $m[28];
}
if (! empty($m[29]))
{
$parts['fragment'] = $m[30];
}
if (! $decode)
{
return $parts;
}
if (! empty($parts['user']))
{
$parts['user'] = rawurldecode($parts['user']);
}
if (! empty($parts['pass']))
{
$parts['pass'] = rawurldecode($parts['pass']);
}
if (! empty($parts['path']))
{
$parts['path'] = rawurldecode($parts['path']);
}
if (isset($h))
{
$parts['host'] = rawurldecode($parts['host']);
}
if (! empty($parts['query']))
{
$parts['query'] = rawurldecode($parts['query']);
}
if (! empty($parts['fragment']))
{
$parts['fragment'] = rawurldecode($parts['fragment']);
}
return $parts;
}
/**
* This function joins together URL components to form a complete URL.
*
* RFC3986 specifies the components of a Uniform Resource Identifier (URI).
* This function implements the specification's "component recomposition"
* algorithm for combining URI components into a full URI string.
*
* The $parts argument is an associative array containing zero or
* more of the following:
*
* "scheme" The scheme, such as "http".
* "host" The host name, IPv4, or IPv6 address.
* "port" The port number.
* "user" The user name.
* "pass" The user password.
* "path" The path, such as a file path for "http".
* "query" The query.
* "fragment" The fragment.
*
* The "port", "user", and "pass" values are only used when a "host"
* is present.
*
* The optional $encode argument indicates if appropriate URL components
* should be percent-encoded as they are assembled into the URL. Encoding
* is only applied to the "user", "pass", "host" (if a host name, not an
* IP address), "path", "query", and "fragment" components. The "scheme"
* and "port" are never encoded. When a "scheme" and "host" are both
* present, the "path" is presumed to be hierarchical and encoding
* processes each segment of the hierarchy separately (i.e., the slashes
* are left alone).
*
* The assembled URL string is returned.
*
* Parameters:
* parts an associative array of strings containing the
* individual parts of a URL.
*
* encode an optional boolean flag selecting whether
* to do percent encoding or not. Default = true.
*
* Return values:
* Returns the assembled URL string. The string is an absolute
* URL if a scheme is supplied, and a relative URL if not. An
* empty string is returned if the $parts array does not contain
* any of the needed values.
*/
function join_url($parts, $encode = FALSE)
{
if ($encode)
{
if (isset($parts['user']))
{
$parts['user'] = rawurlencode($parts['user']);
}
if (isset($parts['pass']))
{
$parts['pass'] = rawurlencode($parts['pass']);
}
if (isset($parts['host']) &&
! preg_match('!^(\[[\da-f.:]+\]])|([\da-f.:]+)$!ui', $parts['host'])
)
{
$parts['host'] = rawurlencode($parts['host']);
}
if (! empty($parts['path']))
{
$parts['path'] = preg_replace(
'!%2F!ui',
'/',
rawurlencode($parts['path'])
);
}
if (isset($parts['query']))
{
$parts['query'] = rawurlencode($parts['query']);
}
if (isset($parts['fragment']))
{
$parts['fragment'] = rawurlencode($parts['fragment']);
}
}
$url = '';
if (! empty($parts['scheme']))
{
$url .= $parts['scheme'] . ':';
}
if (isset($parts['host']))
{
$url .= '//';
if (isset($parts['user']))
{
$url .= $parts['user'];
if (isset($parts['pass']))
{
$url .= ':' . $parts['pass'];
}
$url .= '@';
}
if (preg_match('!^[\da-f]*:[\da-f.:]+$!ui', $parts['host']))
{
$url .= '[' . $parts['host'] . ']';
} // IPv6
else
{
$url .= $parts['host'];
} // IPv4 or name
if (isset($parts['port']))
{
$url .= ':' . $parts['port'];
}
if (! empty($parts['path']) && $parts['path'][0] != '/')
{
$url .= '/';
}
}
if (! empty($parts['path']))
{
$url .= $parts['path'];
}
if (isset($parts['query']))
{
$url .= '?' . $parts['query'];
}
if (isset($parts['fragment']))
{
$url .= '#' . $parts['fragment'];
}
return $url;
}
/**
* This function encodes URL to form a URL which is properly
* percent encoded to replace disallowed characters.
*
* RFC3986 specifies the allowed characters in the URL as well as
* reserved characters in the URL. This function replaces all the
* disallowed characters in the URL with their repective percent
* encodings. Already encoded characters are not encoded again,
* such as '%20' is not encoded to '%2520'.
*
* Parameters:
* url the url to encode.
*
* Return values:
* Returns the encoded URL string.
*/
function encode_url($url)
{
$reserved = array(
":" => '!%3A!ui',
"/" => '!%2F!ui',
"?" => '!%3F!ui',
"#" => '!%23!ui',
"[" => '!%5B!ui',
"]" => '!%5D!ui',
"@" => '!%40!ui',
"!" => '!%21!ui',
"$" => '!%24!ui',
"&" => '!%26!ui',
"'" => '!%27!ui',
"(" => '!%28!ui',
")" => '!%29!ui',
"*" => '!%2A!ui',
"+" => '!%2B!ui',
"," => '!%2C!ui',
";" => '!%3B!ui',
"=" => '!%3D!ui',
"%" => '!%25!ui',
);
$url = rawurlencode($url);
$url = preg_replace(array_values($reserved), array_keys($reserved), $url);
return $url;
}
?>
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