<?php

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namespace Eher\OAuth;

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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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* Needs to return the name of the Signature Method (ie HMAC-SHA1)

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* @return string

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*/

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abstract public function get_name();

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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 Request when the final

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* request is serialized

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* @param Request $request

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* @param Consumer $consumer

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* @param OAuthToken $token

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* @return string

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*/

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abstract public function build_signature($request, $consumer, $token);

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/**

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* Verifies that a given signature is correct

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* @param Request $request

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* @param Consumer $consumer

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* @param OAuthToken $token

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* @param string $signature

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* @return bool

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*/

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public function check_signature($request, $consumer, $token, $signature) {

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$built = $this->build_signature($request, $consumer, $token);

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return $built == $signature;

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}

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}

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