From 4543a45967d30b70a6b708e8063cbebde8b3a49b Mon Sep 17 00:00:00 2001
From: Colan Schwartz <colan@58704.no-reply.drupal.org>
Date: Tue, 17 Jul 2012 15:53:29 -0400
Subject: [PATCH] Issue #1688286 by colan: Add language-specific tags.

---
 metatag.install |   43 ++++++++++++++++++++++++++++++++++++-
 metatag.module  |   63 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 99 insertions(+), 7 deletions(-)

diff --git a/metatag.install b/metatag.install
index 47518f9..8128b5f 100644
--- a/metatag.install
+++ b/metatag.install
@@ -78,8 +78,15 @@ function metatag_schema() {
         'not null' => TRUE,
         'serialize' => TRUE,
       ),
+      'language' => array(
+        'type' => 'varchar',
+        'length' => 32,
+        'not null' => TRUE,
+        'default' => '',
+        'description' => 'The language of the tag',
+      ),
     ),
-    'primary key' => array('entity_type', 'entity_id'),
+    'primary key' => array('entity_type', 'entity_id', 'language'),
   );
 
   $schema['cache_metatag'] = drupal_get_schema_unprocessed('system', 'cache');
@@ -110,3 +117,37 @@ function metatag_update_7001() {
   );
   db_change_field('metatag_config', 'cid', 'cid', $field);
 }
+
+/**
+ * Add the {metatag}.language field.
+ */
+function metatag_update_7002() {
+
+  // Set the target table and field name.
+  $table_name = 'metatag';
+  $field_name = 'language';
+
+  // Don't add the new field if it already exists.
+  if (!db_field_exists($table_name, $field_name)) {
+
+    // Describe the new field.
+    $field_definition = array(
+      'type' => 'varchar',
+      'length' => 32,
+      'not null' => TRUE,
+      'default' => '',
+      'description' => 'The language of the tag',
+    );
+
+    // Add it and update the primary key.
+    db_add_field($table_name, $field_name, $field_definition);
+    db_drop_primary_key($table_name);
+    db_add_primary_key($table_name, array('entity_type', 'entity_id', 'language'));
+
+    // Set default values.
+    db_update($table_name)
+      ->fields(array($field_name => language_default('language')))
+      ->execute();
+  }
+}
+
diff --git a/metatag.module b/metatag.module
index 9899f5e..d6f909a 100644
--- a/metatag.module
+++ b/metatag.module
@@ -271,12 +271,44 @@ function metatag_config_cache_clear() {
   ctools_export_load_object_reset('metatag_config');
 }
 
-function metatag_metatags_load($type, $id) {
-  $metatags = metatag_metatags_load_multiple($type, array($id));
+/**
+ * Load an entity's tags.
+ *
+ * @param $type
+ *   The entity type to load
+ * @param $id
+ *   The ID of the entity to load
+ * @param $language
+ *   The language of the data.
+ * @return
+ *   A list of meta tags for the entity ID.
+ */
+function metatag_metatags_load($type, $id, $language = NULL) {
+
+  // If unset, set the default language.
+  $language = $language ? $language : language_default('language');
+
+  $metatags = metatag_metatags_load_multiple($type, array($id), $language);
   return !empty($metatags) ? reset($metatags) : array();
 }
 
-function metatag_metatags_load_multiple($type, array $ids) {
+/**
+ * Load tags for multiple entities.
+ *
+ * @param $type
+ *   The entity type to load
+ * @param $ids
+ *   The list of entity IDs
+ * @param $language
+ *   The language of the data.
+ * @return
+ *   An array of tag data, keyed by ID.
+ */
+function metatag_metatags_load_multiple($type, array $ids, $language = NULL) {
+
+  // If unset, set the default language.
+  $language = $language ? $language : language_default('language');
+
   // Double check entity IDs are numeric thanks to Entity API module.
   $ids = array_filter($ids, 'is_numeric');
   if (empty($ids)) {
@@ -289,15 +321,32 @@ function metatag_metatags_load_multiple($type, array $ids) {
     return array();
   }
 
-  $metatags = db_query("SELECT entity_id, data FROM {metatag} WHERE entity_type = :type AND entity_id IN (:ids)", array(
+  $metatags = db_query("SELECT entity_id, data FROM {metatag} WHERE (entity_type = :type) AND (entity_id IN (:ids)) AND (language = :language)", array(
     ':type' => $type,
     ':ids' => $ids,
+    ':language' => $language,
   ))->fetchAllKeyed();
   $metatags = array_map('unserialize', $metatags);
   return $metatags;
 }
 
-function metatag_metatags_save($type, $id, $metatags) {
+/**
+ * Save an entity's tags.
+ *
+ * @param $type
+ *   The entity type to load
+ * @param $id
+ *   The entity's ID
+ * @param $metatags
+ *   All of the tag information
+ * @param $language
+ *   The language in which to save the data
+ */
+function metatag_metatags_save($type, $id, $metatags, $language = NULL) {
+
+  // If unset, set the default language.
+  $language = $language ? $language : language_default('language');
+
   // Check that $id is numeric because of Entity API and string IDs.
   if (!is_numeric($id)) {
     return;
@@ -306,7 +355,7 @@ function metatag_metatags_save($type, $id, $metatags) {
   // Allow other modules to alter the metatags prior to saving.
   foreach (module_implements('metatag_presave') as $module) {
     $function = "{$module}_metatag_presave";
-    $function($metatags, $type, $id);
+    $function($metatags, $type, $id, $language);
   }
 
   if (empty($metatags)) {
@@ -315,6 +364,7 @@ function metatag_metatags_save($type, $id, $metatags) {
     db_delete('metatag')
       ->condition('entity_type', $type)
       ->condition('entity_id', $id)
+      ->condition('language', $language)
       ->execute();
   }
   else {
@@ -323,6 +373,7 @@ function metatag_metatags_save($type, $id, $metatags) {
       ->key(array(
         'entity_type' => $type,
         'entity_id' => $id,
+        'language' => $language,
       ))
       ->fields(array(
         'data' => serialize($metatags),
-- 
1.7.0.4