Add explicit dependencies to twitter addon

twitter/vendor/abraham/twitteroauth/src/SignatureMethod.php

@@ -0,0 +1,66 @@
+<?php
+/**
+ * The MIT License
+ * Copyright (c) 2007 Andy Smith
+ */
+namespace Abraham\TwitterOAuth;
+
+/**
+ * A class for implementing a Signature Method
+ * See section 9 ("Signing Requests") in the spec
+ */
+abstract class SignatureMethod
+{
+    /**
+     * Needs to return the name of the Signature Method (ie HMAC-SHA1)
+     *
+     * @return string
+     */
+    abstract public function getName();
+
+    /**
+     * Build up the signature
+     * NOTE: The output of this function MUST NOT be urlencoded.
+     * the encoding is handled in OAuthRequest when the final
+     * request is serialized
+     *
+     * @param Request $request
+     * @param Consumer $consumer
+     * @param Token $token
+     *
+     * @return string
+     */
+    abstract public function buildSignature(Request $request, Consumer $consumer, Token $token = null);
+
+    /**
+     * Verifies that a given signature is correct
+     *
+     * @param Request $request
+     * @param Consumer $consumer
+     * @param Token $token
+     * @param string $signature
+     *
+     * @return bool
+     */
+    public function checkSignature(Request $request, Consumer $consumer, Token $token, $signature)
+    {
+        $built = $this->buildSignature($request, $consumer, $token);
+
+        // Check for zero length, although unlikely here
+        if (strlen($built) == 0 || strlen($signature) == 0) {
+            return false;
+        }
+
+        if (strlen($built) != strlen($signature)) {
+            return false;
+        }
+
+        // Avoid a timing leak with a (hopefully) time insensitive compare
+        $result = 0;
+        for ($i = 0; $i < strlen($signature); $i++) {
+            $result |= ord($built{$i}) ^ ord($signature{$i});
+        }
+
+        return $result == 0;
+    }
+}