Initial commit

Author: heshanlk

CHANGELOG.txt

@@ -0,0 +1,181 @@
+<?php
+
+/**
+ * @file
+ * Common functions
+ */
+
+/**
+ * Returns the provider for a url.
+ *
+ * @param string $url
+ *  Teh url to get the provider for.
+ * @return mixed
+ *  A valid callback or FALSE
+ */
+function micropublisher_oembed_get_provider($url, &$matches) {
+  $host = _micropublisher_oembed_get_host($url);
+  if ($host) {
+    $providers = micropublisher_oembed_providers($host);
+    foreach ($providers as $regex => $info) {
+      if (preg_match($regex, $url, $matches)) {
+        return $info;
+      }
+    }
+  }
+  return FALSE;
+}
+
+/**
+ * A utility function to get the base domain from a url.
+ *
+ * @param string $uri
+ *  The uri to get the domain form
+ * @return string
+ *  The domain or NULL
+ */
+function _micropublisher_oembed_get_host($uri) {
+  $matches = array();
+  if (preg_match('/^https?\:\/\/([^\/]+)/', $uri, $matches)) {
+    $matches = explode('.', $matches[1]);
+    $match_count = count($matches);
+    if ($match_count > 1) {
+      return $matches[$match_count - 2] . '.' . $matches[$match_count - 1];
+    }
+    else {
+      return $matches[0];
+    }
+  }
+  return NULL;
+}
+
+/**
+ * Returns all the registered providers, or the providers for a specific host.
+ *
+ * @param string $host
+ *  Optional. Supply a hostname if you only want the provider patterns for a specific host.
+ * @return array
+ */
+function micropublisher_oembed_providers($url_host = NULL) {
+  static $providers;
+
+  if (!$providers) {
+    $cache_key = 'oembed:micropublisher:providers';
+
+    if (!($cache = cache_get($cache_key)) && isset($cache->data)) {
+      $providers = $cache->data;
+    }
+    else {
+      $providers = array();
+      $modules = module_implements('oembedprovider');
+      foreach ($modules as $module) {
+        $ps = call_user_func($module . '_oembedprovider');
+        foreach ($ps as $pattern => $info) {
+          $host = _micropublisher_oembed_get_host($info->scheme);
+          $regex_pattern = '/' . str_replace('\*', '(.+)', preg_quote($pattern, '/')) . '/';
+          $providers[$host][$regex_pattern] = $info;
+        }
+      }
+      drupal_alter('oembedprovider', $providers);
+      foreach ($providers as $host => &$patterns) {
+        uksort($patterns, '_micropublisher_oembed_specificity_compare');
+      }
+      cache_set($cache_key, $providers);
+    }
+  }
+
+  if ($url_host) {
+    return isset($providers[$url_host]) ? $providers[$url_host] : array();
+  }
+  return $providers;
+}
+
+/**
+ * Fetch data for an embeddable URL.
+ *
+ * @param string $url
+ *   An external URL for the content to embed.
+ * @param array $attributes
+ *   An associative array of attributes, with the following keys:
+ *   - 'maxwidth'
+ *       The maximum width of the embed, in pixels.
+ *   - 'maxheight'
+ *       The maximum height of the embed, in pixels.
+ * @return
+ *   False or an object representing the embeddable data of the URL.
+ */
+function micropublisher_oembed_data($url, $attributes = array()) {
+  $matches = array();
+  if ($provider = (array) micropublisher_oembed_get_provider($url, $matches)) {
+    return micropublisher_oembed_fetch($provider, $url, $matches, $attributes);
+  }
+  return FALSE;
+}
+
+/**
+ * Fetch data for an embeddable URL.
+ */
+function micropublisher_oembed_fetch($provider, $url, $matches, $attributes = array()) {
+  global $_oembed_default_attributes;
+
+  $embed = FALSE;
+
+  if (!empty($_oembed_default_attributes)) {
+    $attributes = array_merge($_oembed_default_attributes, $attributes);
+  }
+  $attributes['url'] = $url;
+  $query = http_build_query($attributes, NULL, '&');
+
+  $source = isset($provider['callback']) ? $provider['callback'] : $provider['endpoint'];
+  $cache_key = 'oembed:micropublisher:embed:' . md5($source . $url . $query);
+  $cache = cache_get($cache_key);
+
+  if ($cache && isset($cache->data)) {
+    $embed = $cache->data;
+  }
+  else {
+    if (!empty($provider['callback'])) {
+      $embed = call_user_func($provider['callback'], $provider, $url, $matches, $attributes);
+      if ($embed) {
+        $embed = (object) $embed;
+      }
+    }
+    else {
+      $fetch_url = $provider['endpoint'] . '?' . $query;
+
+      //TODO: Add alternative ways of fetching the content - like http client?
+      $response = drupal_http_request($fetch_url);
+      if (!$response->error) {
+        $embed = json_decode($response->data);
+        if (!is_object($embed)) {
+          try {
+            $embed = @new SimpleXMLElement($response->data);
+            $embed = (object) get_object_vars($embed);
+            if (!is_string($embed->title)) {
+              $embed->title = '';
+            }
+          } catch (Exception $e) {
+            watchdog('micropublisher', 'Could not parse response from %url.', array('%url' => $fetch_url), WATCHDOG_ERROR);
+          }
+        }
+
+        if (empty($embed->version) || empty($embed->type) || intval($embed->version) != 1) {
+          $embed = FALSE;
+          watchdog('micropublisher', 'Response from %url not a valid oEmbed response.', array('%url' => $fetch_url), WATCHDOG_ERROR);
+        }
+      }
+      else {
+        watchdog('micropublisher', 'Error fetching data from %url.', array('%url' => $fetch_url), WATCHDOG_ERROR);
+      }
+    }
+
+    if ($embed) {
+      $embed->original_url = $url;
+    }
+
+    $max_age = isset($embed->cache_age) ? intval($embed->cache_age) : empty($provider['callback']) ? 600 : 60;
+    cache_set($cache_key, $embed, 'cache', time() + $max_age);
+  }
+
+  return $embed;
+}