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infinio

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✏️ Editing: OAuthSignatureMethod_HMAC_SHA1.php

<?php

namespace IMSGlobal\LTI\OAuth;

/**
 * Class to represent an %OAuth HMAC_SHA1 signature method
 *
 * @copyright  Andy Smith
 * @version 2008-08-04
 * @license https://opensource.org/licenses/MIT The MIT License
 */
/**
 * The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
 * where the Signature Base String is the text and the key is the concatenated values (each first
 * encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
 * character (ASCII code 38) even if empty.
 *   - Chapter 9.2 ("HMAC-SHA1")
 */
#[\AllowDynamicProperties]
class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {

function get_name() {
        return "HMAC-SHA1";
    }

public function build_signature($request, $consumer, $token) {

$base_string = $request->get_signature_base_string();
        $request->base_string = $base_string;

$key_parts = array(
          $consumer->secret,
          ($token) ? $token->secret : ""
        );

$key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
        $key = implode('&', $key_parts);

return base64_encode(hash_hmac('sha1', $base_string, $key, true));

}

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