s2member / includes / classes / utils-urls.inc.php

utils-urls.inc.php in s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions 111003, at includes/classes/utils-urls.inc.php

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1	<?php
2	/**
3	* URL utilities.
4	*
5	* Copyright: © 2009-2011
6	* {@link http://www.websharks-inc.com/ WebSharks, Inc.}
7	* ( coded in the USA )
8	*
9	* Released under the terms of the GNU General Public License.
10	* You should have received a copy of the GNU General Public License,
11	* along with this software. In the main directory, see: /licensing/
12	* If not, see: {@link http://www.gnu.org/licenses/}.
13	*
14	* @package s2Member\Utilities
15	* @since 3.5
16	*/
17	if (realpath (__FILE__) === realpath ($_SERVER["SCRIPT_FILENAME"]))
18	exit("Do not access this file directly.");
19	/**/
20	if (!class_exists ("c_ws_plugin__s2member_utils_urls"))
21	{
22	/**
23	* URL utilities.
24	*
25	* @package s2Member\Utilities
26	* @since 3.5
27	*/
28	class c_ws_plugin__s2member_utils_urls
29	{
30	/**
31	* Builds a WordPress® signup URL to `/wp-signup.php`.
32	*
33	* @package s2Member\Utilities
34	* @since 3.5
35	*
36	* @return str Full URL to `/wp-signup.php`.
37	*/
38	public static function wp_signup_url () /* With Filters. */
39	{
40	return apply_filters ("wp_signup_location", site_url ("/wp-signup.php"));
41	}
42	/**
43	* Builds a WordPress® registration URL to `/wp-login.php?action=register`.
44	*
45	* @package s2Member\Utilities
46	* @since 3.5
47	*
48	* @param str $redirect_to Optional. Force a specific redirection after registration.
49	* @return str Location of `/wp-login.php?action=register`.
50	*/
51	public static function wp_register_url ($redirect_to = FALSE)
52	{
53	return apply_filters ("wp_register_location", /* « NOT a core Filter; we're anticipating. */
54	add_query_arg ("action", urlencode ("register"), wp_login_url ($redirect_to)), get_defined_vars ());
55	}
56	/**
57	* Filters content redirection status ( uses 302s for browsers ).
58	*
59	* @package s2Member\Utilities
60	* @since 3.5
61	*
62	* @attaches-to: ``add_filter("ws_plugin__s2member_content_redirect_status");``
63	*
64	* @param int\|str $status A numeric redirection status code.
65	* @return int\|str A numeric status redirection code, possibly modified to a value of `302`.
66	*
67	* @see http://en.wikipedia.org/wiki/Web_browser_engine
68	*/
69	public static function redirect_browsers_using_302_status ($status = 301)
70	{
71	$engines = "msie\|trident\|gecko\|webkit\|presto\|konqueror\|playstation";
72	/**/
73	if ((int)$status === 301 && !empty ($_SERVER["HTTP_USER_AGENT"]))
74	if (($is_browser = preg_match ("/(" . $engines . ")[\/ ]([0-9\.]+)/i", $_SERVER["HTTP_USER_AGENT"])))
75	return 302;
76	/**/
77	return $status; /* Else keep existing status code. */
78	}
79	/**
80	* Parses out a full valid URI, from either a full URL, or a partial.
81	*
82	* @package s2Member\Utilities
83	* @since 3.5
84	*
85	* @param str $url_or_uri Either a full URL, or a partial URI.
86	* @return str\|bool A valid URI, starting with `/` on success, else false.
87	*/
88	public static function parse_uri ($url_or_uri = FALSE)
89	{
90	if (($parse = @parse_url ($url_or_uri))) /* See: http://php.net/manual/en/function.parse-url.php. */
91	{
92	$parse["path"] = (!empty ($parse["path"])) ? ((strpos ($parse["path"], "/") === 0) ? $parse["path"] : "/" . $parse["path"]) : "/";
93	$parse["path"] = preg_replace ("/\/+/", "/", $parse["path"]); /* Removes multi slashes. */
94	/**/
95	return (!empty ($parse["query"])) ? $parse["path"] . "?" . $parse["query"] : $parse["path"];
96	}
97	/**/
98	return false;
99	}
100	/**
101	* Responsible for all remote communications processed by s2Member.
102	*
103	* Uses ``wp_remote_request()`` through the `WP_Http` class.
104	* This function will try to use cURL first, and then fall back on FOPEN and/or other supported transports.
105	*
106	* @package s2Member\Utilities
107	* @since 3.5
108	*
109	* @param str $url Full URL with possible query string parameters.
110	* @param str\|array $post_vars Optional. Either a string of POST vars, or an array.
111	* @param array $args Optional. An array of additional arguments used by ``wp_remote_request()``.
112	* @param bool $return Optional. One of: `body\|array`. Defaults to `body`. If `array`, an array with the following elements is returned:
113	* `headers` (an array of headers), `body` (the response body string), `code` (http response code), `message` (http response message), `response` (response array).
114	* @return str\|array\|bool Requested response data from the remote location (see ``$return`` parameter ), else false on failure.
115	*/
116	public static function remote ($url = FALSE, $post_vars = FALSE, $args = FALSE, $return = FALSE)
117	{
118	if ($url && is_string ($url)) /* We MUST have a valid full URL (string) before we do anything in this routine. */
119	{
120	$args = (!is_array ($args)) ? array (): $args; /* Force array & disable SSL verification. */
121	$args["sslverify"] = (!isset ($args["sslverify"])) ? /* Off. */ false : $args["sslverify"];
122	/**/
123	if ((is_array ($post_vars) \|\| is_string ($post_vars)) && !empty ($post_vars))
124	$args = array_merge ($args, array ("method" => "POST", "body" => $post_vars));
125	/**/
126	if (preg_match ("/^https/i", $url) && stripos (PHP_OS, "win") === 0)
127	add_filter ("use_curl_transport", "__return_false", ($curl_disabled = 1352));
128	/**/
129	if (!has_filter ("http_response", "c_ws_plugin__s2member_utils_urls::_remote_gz_variations"))
130	add_filter ("http_response", "c_ws_plugin__s2member_utils_urls::_remote_gz_variations");
131	/**/
132	$response = wp_remote_request ($url, $args); /* Try to process the remote request now. */
133	/**/
134	if ($return === "array" /* Return array? */ && !is_wp_error ($response) && is_array ($response))
135	{
136	$r = array ("code" => (int)wp_remote_retrieve_response_code ($response), "message" => wp_remote_retrieve_response_message ($response));
137	/**/
138	$r = array_merge ($r, array ("o_headers" => wp_remote_retrieve_headers ($response), "headers" => array ()));
139	foreach (array_keys ($r["o_headers"]) as $header) /* Array of lowercase headers makes things easier. */
140	$r["headers"][strtolower ($header)] = $r["o_headers"][$header];
141	/**/
142	$r = array_merge ($r, array ("body" => wp_remote_retrieve_body ($response), "response" => $response));
143	}
144	/**/
145	else if (!is_wp_error ($response) && is_array ($response)) /* Else returning ``$response`` body only. */
146	$r = wp_remote_retrieve_body ($response);
147	/**/
148	else /* Else this remote request has failed completely. We must return a `false` value. */
149	$r = false; /* Remote request failed, return false. */
150	/**/
151	if (isset ($curl_disabled) && $curl_disabled === 1352) /* Remove this Filter now? */
152	remove_filter ("use_curl_transport", "__return_false", 1352);
153	/**/
154	return $r; /* The ``$r`` return value. */
155	}
156	/**/
157	else /* Else, return false. */
158	return false;
159	}
160	/**
161	* Filters the `WP_Http` response for additional gzinflate variations.
162	*
163	* @package s2Member\Utilities
164	* @since 3.5
165	*
166	* @attaches-to: ``add_filter("http_response");``
167	*
168	* @param array $response An array of response details.
169	* @return array of ``$response`` details, with possible body modifications.
170	*/
171	public static function _remote_gz_variations ($response = array ())
172	{
173	if (!isset ($response["ws__gz_variations"]) && ($response["ws__gz_variations"] = 1))
174	{
175	if (!empty ($response["headers"]["content-encoding"]))
176	if (!empty ($response["body"]) && substr ($response["body"], 0, 2) === "\x78\x9c")
177	if (($gz = @gzinflate (substr ($response["body"], 2))))
178	$response["body"] = $gz;
179	}
180	/**/
181	return $response; /* Return response. */
182	}
183	/**
184	* Shortens a long URL through tinyURL, or through another backup API used by this routine.
185	*
186	* @package s2Member\Utilities
187	* @since 111002
188	*
189	* @param str $url A full/long URL to be shortened.
190	* @param str $api_sp Optional. A specific URL shortening API to use. Defaults to that which is configured in the s2Member Dashboard. Normally `tiny_url` by default.
191	* @param bool $try_backups Defaults to true. If a failure occurs with the first API, we'll try others until we have success.
192	* @return str\|bool The shortened URL on success, else false on failure.
193	*/
194	public static function shorten ($url = FALSE, $api_sp = FALSE, $try_backups = TRUE)
195	{
196	$url = ($url && is_string ($url)) ? $url : false; /* Only accept a string value here. */
197	$api_sp = ($api_sp && is_string ($api_sp)) ? $api_sp : false; /* Only accept a string value. */
198	/**/
199	$default_url_shortener = $GLOBALS["WS_PLUGIN__"]["s2member"]["o"]["default_url_shortener"];
200	$default_custom_str_url_shortener = $GLOBALS["WS_PLUGIN__"]["s2member"]["o"]["default_custom_str_url_shortener"];
201	/**/
202	$apis = array ("tiny_url", "goo_gl"); /* The shortening APIs integrated with this routine so far. More will come soon. */
203	/**/
204	if ($url && ($api = ($api_sp) ? strtolower ($api_sp) : $default_url_shortener)) /* If specific, use it. Otherwise, default shortener. */
205	{
206	if (!$api_sp && ($custom_url = apply_filters ("ws_plugin__s2member_url_shorten", false, get_defined_vars ())) && stripos ($custom_url, "http") === 0)
207	return ($shorter_url = $custom_url); /* Using whatever other shortener API you prefer, over the ones available by default with s2Member. */
208	/**/
209	else if (!$api_sp && stripos ($default_custom_str_url_shortener, "http") === 0 && ($custom_url = trim (c_ws_plugin__s2member_utils_urls::remote (str_ireplace (array ("%%s2_long_url%%", "%%s2_long_url_md5%%"), array (rawurlencode ($url), urlencode (md5 ($url))), $default_custom_str_url_shortener)))) && stripos ($custom_url, "http") === 0)
210	return ($shorter_url = $custom_url); /* Using whatever other shortener API that a site owner prefers, over the ones available by default with s2Member. */
211	/**/
212	else if ($api === "tiny_url" && ($tiny_url = trim (c_ws_plugin__s2member_utils_urls::remote ("http://tinyurl.com/api-create.php?url=" . rawurlencode ($url)))) && stripos ($tiny_url, "http") === 0)
213	return ($shorter_url = $tiny_url); /* The default tinyURL API: <http://tinyurl.com/api-create.php?url=http://www.example.com/>.
214	/**/
215	else if ($api === "goo_gl" && ($goo_gl = json_decode (trim (c_ws_plugin__s2member_utils_urls::remote ("https://www.googleapis.com/urlshortener/v1/url" . ((($goo_gl_key = apply_filters ("ws_plugin__s2member_url_shorten_api_goo_gl_key", false))) ? "?key=" . urlencode ($goo_gl_key) : ""), json_encode (array ("longUrl" => $url)), array ("headers" => array ("Content-Type" => "application/json")))), true)) && !empty ($goo_gl["id"]) && ($goo_gl_url = $goo_gl["id"]) && stripos ($goo_gl_url, "http") === 0)
216	return ($shorter_url = $goo_gl_url); /* Google® API: <http://code.google.com/apis/urlshortener/v1/getting_started.html>.
217	/**/
218	else if ($try_backups && count ($apis) > 1) /* Try backups? This way we can still try to shorten the URL. */
219	/**/
220	foreach (array_diff ($apis, array ($api)) as $backup)
221	if (($backup = c_ws_plugin__s2member_utils_urls::shorten ($url, $backup, false)))
222	return ($shorter_url = $backup);
223	}
224	/**/
225	return false; /* Default return value. */
226	}
227	}
228	}
229	?>