added handlers for creating and validating tokens

includes/islandora_authtokens.inc

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @file
+ */
+
+define('TOKEN_TIMEOUT', 30000);
+
+function islandora_get_object_token($pid, $dsid) {
+  global $user;
+  $time = time();
+  $token = hash("sha256", $user->uid . $pid . $dsid . $time);
+
+  $id = db_insert("islandora_authtokens")
+    ->fields(array(
+      'token' => $token,
+      'uid' => $user->uid,
+      'pid' => $pid,
+      'dsid' => $dsid,
+      'time' => $time,
+    ))
+    ->execute();
+  return $token;
+}
+
+function islandora_validate_object_token($pid, $dsid, $token) {
+  global $user;
+  // check for database token
+  $time = time();
+  $result = db_select("islandora_authtokens", "id")
+    ->fields("id")
+    ->condition('token', $token, '=')
+    ->condition('uid', $user->uid, '=')
+    ->condition('pid', $pid, '=')
+    ->condition('dsid', $dsid, '=')
+    ->condition('time', $time, '<=')
+    ->condition('time', $time-TOKEN_TIMEOUT, '>')
+    ->execute()
+    ->rowCount();
+
+  //** this is for one-time use tokens **//
+  // remove the authtoken (if it exists) so it can't be used again
+  db_delete("islandora_authtokens")
+    ->condition('token', $token, '=')
+    ->condition('uid', $user->uid, '=')
+    ->condition('pid', $pid, '=')
+    ->condition('dsid', $dsid, '=')
+    ->execute();
+
+//  print_r($result);
+  return $result > 0;
+}