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