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https://github.com/silverstripe/silverstripe-framework
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BUGFIX: add comments, make the code more readable
This commit is contained in:
Mateusz Uzdowski
parent
63ed0cba32
commit
1c8d39be4c
@ -1,24 +1,55 @@
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<?php
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/**
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* Format of the Oembed config. Autodiscover allows discovery of all URLs.
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* Endpoint set to true means autodiscovery for this specific provider is allowed
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* (even if autodiscovery in general has been disabled).
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*
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* Oembed:
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* providers:
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* {pattern}:
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* {endpoint}/true
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* autodiscover:
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* true/false
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*/
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class Oembed {
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/**
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* Gets the autodiscover setting from the config.
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*/
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public static function get_autodiscover() {
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return Config::inst()->get('Oembed', 'autodiscover');
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}
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/**
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* Gets providers from config.
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*/
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public static function get_providers() {
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return Config::inst()->get('Oembed', 'providers');
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}
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protected static function match_url($url) {
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/**
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* Returns an endpoint (a base Oembed URL) from first matching provider.
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*
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* @param $url Human-readable URL.
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* @returns string/bool URL of an endpoint, or false if no matching provider exists.
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*/
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protected static function find_endpoint($url) {
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foreach(self::get_providers() as $scheme=>$endpoint) {
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if(self::match_scheme($url, $scheme)) {
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if(self::matches_scheme($url, $scheme)) {
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return $endpoint;
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}
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}
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return false;
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}
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protected static function match_scheme($url, $scheme) {
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/**
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* Checks the URL if it matches against the scheme (pattern).
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*
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* @param $url Human-readable URL to be checked.
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* @param $scheme Pattern to be matched against.
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* @returns bool Whether the pattern matches or not.
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*/
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protected static function matches_scheme($url, $scheme) {
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$urlInfo = parse_url($url);
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$schemeInfo = parse_url($scheme);
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foreach($schemeInfo as $k=>$v) {
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@ -40,15 +71,24 @@ class Oembed {
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}
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return true;
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}
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/**
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* Performs a HTTP request to the URL and scans the response for resource links
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* that mention oembed in their type.
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*
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* @param $url Human readable URL.
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* @returns string/bool Oembed URL, or false.
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*/
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protected static function autodiscover_from_url($url) {
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// Fetch the URL
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$service = new RestfulService($url);
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$body = $service->request();
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if(!$body || $body->isError()) {
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return false;
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}
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$body = $body->getBody();
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// Look within the body for an oembed link.
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if(preg_match_all('#<link[^>]+?(?:href=[\'"](.+?)[\'"][^>]+?)?type=["\']application/json\+oembed["\'](?:[^>]+?href=[\'"](.+?)[\'"])?#', $body, $matches, PREG_SET_ORDER)) {
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$match = $matches[0];
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if(!empty($match[1])) {
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@ -61,19 +101,32 @@ class Oembed {
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return false;
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}
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public static function get_oembed_from_url($url, $type = false, Array $options = array()) {
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$endpoint = self::match_url($url);
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$ourl = false;
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/**
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* Takes the human-readable URL of an embeddable resource and converts it into an
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* Oembed_Result descriptor (which contains a full Oembed resource URL).
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*
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* @param $url Human-readable URL
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* @param $type ?
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* @param $options array Options to be used for constructing the resulting descriptor.
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* @returns Oembed_Result/bool An Oembed descriptor, or false
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*/
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public static function get_oembed_from_url($url, $type = false, array $options = array()) {
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// Find or build the Oembed URL.
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$endpoint = self::find_endpoint($url);
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$oembedUrl = false;
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if(!$endpoint) {
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if(self::get_autodiscover()) {
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$ourl = self::autodiscover_from_url($url);
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$oembedUrl = self::autodiscover_from_url($url);
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}
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} elseif($endpoint === true) {
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$ourl = self::autodiscover_from_url($url);
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$oembedUrl = self::autodiscover_from_url($url);
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} else {
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$ourl = Controller::join_links($endpoint, '?format=json&url=' . rawurlencode($url));
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// Build the url manually - we gave all needed information.
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$oembedUrl = Controller::join_links($endpoint, '?format=json&url=' . rawurlencode($url));
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}
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if($ourl) {
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if($oembedUrl) {
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// Inject the options into the Oembed URL.
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if($options) {
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if(isset($options['width']) && !isset($options['maxwidth'])) {
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$options['maxwidth'] = $options['width'];
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@ -81,10 +134,13 @@ class Oembed {
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if(isset($options['height']) && !isset($options['maxheight'])) {
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$options['maxheight'] = $options['height'];
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}
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$ourl = Controller::join_links($ourl, '?' . http_build_query($options, '', '&'));
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$oembedUrl = Controller::join_links($oembedUrl, '?' . http_build_query($options, '', '&'));
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}
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return new Oembed_Result($ourl, $url, $type, $options);
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return new Oembed_Result($oembedUrl, $url, $type, $options);
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}
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// No matching Oembed resource found.
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return false;
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}
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@ -105,17 +161,37 @@ class Oembed {
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}
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class Oembed_Result extends ViewableData {
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/**
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* JSON data fetched from the Oembed URL.
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* This data is accessed dynamically by getField and hasField.
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*/
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protected $data = false;
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/**
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* Human readable URL
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*/
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protected $origin = false;
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/**
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* ?
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*/
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protected $type = false;
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/**
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* Oembed URL
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*/
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protected $url;
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/**
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* Class to be injected into the resulting HTML element.
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*/
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protected $extraClass;
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public static $casting = array(
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'html' => 'HTMLText',
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);
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public function __construct($url, $origin = false, $type = false, Array $options = array()) {
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public function __construct($url, $origin = false, $type = false, array $options = array()) {
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$this->url = $url;
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$this->origin = $origin;
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$this->type = $type;
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@ -127,10 +203,16 @@ class Oembed_Result extends ViewableData {
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parent::__construct();
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}
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/**
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* Fetches the JSON data from the Oembed URL (cached).
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* Only sets the internal variable.
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*/
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protected function loadData() {
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if($this->data !== false) {
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return;
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}
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// Fetch from Oembed URL
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$service = new RestfulService($this->url);
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$body = $service->request();
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if(!$body || $body->isError()) {
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@ -149,14 +231,21 @@ class Oembed_Result extends ViewableData {
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if($this->type && $this->type != $data['type']) {
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$data = array();
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}
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$this->data = $data;
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}
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/**
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* Wrap the check for looking into Oembed JSON within $this->data.
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*/
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public function hasField($field) {
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$this->loadData();
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return array_key_exists(strtolower($field), $this->data);
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}
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/**
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* Wrap the field calls to fetch data from Oembed JSON (within $this->data)
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*/
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public function getField($field) {
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$field = strtolower($field);
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if($this->hasField($field)) {
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