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<?php |
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/** |
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* Copyright 2016 Facebook, Inc. |
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* |
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* You are hereby granted a non-exclusive, worldwide, royalty-free license to |
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* use, copy, modify, and distribute this software in source code or binary |
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* form for use in connection with the web services and APIs provided by |
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* Facebook. |
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* |
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* As with any software that integrates with the Facebook platform, your use |
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* of this software is subject to the Facebook Developer Principles and |
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* Policies [http://developers.facebook.com/policy/]. This copyright notice |
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* shall be included in all copies or substantial portions of the software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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namespace Facebook\Url; |
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/** |
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* Class FacebookUrlManipulator |
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* |
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* @package Facebook |
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*/ |
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class FacebookUrlManipulator |
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{ |
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/** |
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* Remove params from a URL. |
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* |
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* @param string $url The URL to filter. |
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* @param array $paramsToFilter The params to filter from the URL. |
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* |
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* @return string The URL with the params removed. |
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*/ |
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public static function removeParamsFromUrl($url, array $paramsToFilter) |
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{ |
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$parts = parse_url($url); |
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$query = ''; |
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if (isset($parts['query'])) { |
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$params = []; |
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parse_str($parts['query'], $params); |
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// Remove query params |
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foreach ($paramsToFilter as $paramName) { |
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unset($params[$paramName]); |
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} |
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if (count($params) > 0) { |
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$query = '?' . http_build_query($params, null, '&'); |
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} |
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} |
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$scheme = isset($parts['scheme']) ? $parts['scheme'] . '://' : ''; |
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$host = isset($parts['host']) ? $parts['host'] : ''; |
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$port = isset($parts['port']) ? ':' . $parts['port'] : ''; |
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$path = isset($parts['path']) ? $parts['path'] : ''; |
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$fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : ''; |
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return $scheme . $host . $port . $path . $query . $fragment; |
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} |
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/** |
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* Gracefully appends params to the URL. |
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* |
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* @param string $url The URL that will receive the params. |
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* @param array $newParams The params to append to the URL. |
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* |
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* @return string |
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*/ |
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public static function appendParamsToUrl($url, array $newParams = []) |
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{ |
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if (empty($newParams)) { |
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return $url; |
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} |
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if (strpos($url, '?') === false) { |
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return $url . '?' . http_build_query($newParams, null, '&'); |
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} |
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list($path, $query) = explode('?', $url, 2); |
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$existingParams = []; |
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parse_str($query, $existingParams); |
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// Favor params from the original URL over $newParams |
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$newParams = array_merge($newParams, $existingParams); |
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// Sort for a predicable order |
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ksort($newParams); |
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return $path . '?' . http_build_query($newParams, null, '&'); |
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} |
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/** |
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* Returns the params from a URL in the form of an array. |
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* |
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* @param string $url The URL to parse the params from. |
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* |
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* @return array |
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*/ |
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public static function getParamsAsArray($url) |
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{ |
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$query = parse_url($url, PHP_URL_QUERY); |
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if (!$query) { |
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return []; |
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} |
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$params = []; |
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parse_str($query, $params); |
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return $params; |
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} |
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/** |
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* Adds the params of the first URL to the second URL. |
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* |
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* Any params that already exist in the second URL will go untouched. |
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* |
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* @param string $urlToStealFrom The URL harvest the params from. |
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* @param string $urlToAddTo The URL that will receive the new params. |
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* |
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* @return string The $urlToAddTo with any new params from $urlToStealFrom. |
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*/ |
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public static function mergeUrlParams($urlToStealFrom, $urlToAddTo) |
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{ |
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$newParams = static::getParamsAsArray($urlToStealFrom); |
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// Nothing new to add, return as-is |
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if (!$newParams) { |
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return $urlToAddTo; |
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} |
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return static::appendParamsToUrl($urlToAddTo, $newParams); |
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} |
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/** |
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* Check for a "/" prefix and prepend it if not exists. |
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* |
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* @param string|null $string |
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* |
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* @return string|null |
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*/ |
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public static function forceSlashPrefix($string) |
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{ |
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if (!$string) { |
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return $string; |
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} |
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return strpos($string, '/') === 0 ? $string : '/' . $string; |
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} |
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/** |
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* Trims off the hostname and Graph version from a URL. |
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* |
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* @param string $urlToTrim The URL the needs the surgery. |
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* |
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* @return string The $urlToTrim with the hostname and Graph version removed. |
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*/ |
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public static function baseGraphUrlEndpoint($urlToTrim) |
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{ |
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return '/' . preg_replace('/^https:\/\/.+\.facebook\.com(\/v.+?)?\//', '', $urlToTrim); |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: