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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| <?php | ||
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| namespace Plivo\Util; | ||
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| use Plivo\Exceptions\PlivoValidationException; | ||
|
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| class v3SignatureValidation | ||
| { | ||
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| private static function stringifyParams($params) | ||
| { | ||
| foreach ($params as $key => $value) | ||
| { | ||
| $params[$key] = strval($value); | ||
| } | ||
| return $params; | ||
| } | ||
|
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| private static function getMapFromQuery($queryString) | ||
| { | ||
| $queryMap = array(); | ||
| if ($queryString == null) { | ||
| return $queryMap; | ||
| } | ||
| $queryArray = explode("&", $queryString); | ||
| foreach ($queryArray as $param) | ||
| { | ||
| $keyValue = explode("=", $param); | ||
| $key = $keyValue[0]; | ||
| $value = $keyValue[1]; | ||
| if (array_key_exists($key, $queryMap)) | ||
| { | ||
| array_push($queryMap[$key], $value); | ||
| } | ||
| else | ||
| { | ||
| $queryMap[$key] = array($value); | ||
| } | ||
| } | ||
| return $queryMap; | ||
| } | ||
|
|
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| private static function getSortedQueryString($queryMap) | ||
| { | ||
| $queryString = array(); | ||
| ksort($queryMap, SORT_NATURAL); | ||
| foreach ($queryMap as $key => $value) | ||
| { | ||
| if (gettype($value) === "array") | ||
| { | ||
| sort($value, SORT_NATURAL); | ||
| foreach ($value as $val) | ||
| { | ||
| array_push($queryString, strval($key)."=".strval($val)); | ||
| } | ||
| } | ||
| else | ||
| { | ||
| array_push($queryString, strval($key)."=".strval($value)); | ||
| } | ||
| } | ||
| return implode("&", $queryString); | ||
| } | ||
|
|
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| private static function getSortedParamsString($params) | ||
| { | ||
| $keys = array_keys($params); | ||
| sort($keys, SORT_NATURAL); | ||
| $paramsString = array(); | ||
|
|
||
| foreach ($keys as $key) | ||
| { | ||
| $value = $params[$key]; | ||
| if (gettype($value) === "array") | ||
| { | ||
| $value = sort($value, SORT_NATURAL); | ||
| foreach ($value as $val) | ||
| { | ||
| array_push($paramsString, strval($key).strval($val)); | ||
| } | ||
| } | ||
| else | ||
| { | ||
| array_push($paramsString, strval($key).strval($value)); | ||
| } | ||
| } | ||
| return implode("", $paramsString); | ||
| } | ||
|
|
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| private static function constructGetUrl($uri, $params, $emptyPostParams=true) | ||
| { | ||
| $parsedURI = parse_url($uri); | ||
| $baseURL = $parsedURI['scheme'].'://'.$parsedURI['host']; | ||
| if (isset($parsedURI['port'])) { | ||
| $baseURL .= ':'.$parsedURI['port']; | ||
| } | ||
| if (isset($parsedURI['path'])) { | ||
| $baseURL .= $parsedURI['path']; | ||
| } | ||
| $queryString = $parsedURI['query']; | ||
| $params = array_merge_recursive($params, self::getMapFromQuery($queryString)); | ||
| $queryParams = self::getSortedQueryString($params); | ||
| if (strlen($queryParams) > 0 or !$emptyPostParams) | ||
| { | ||
| $baseURL .= '?'.$queryParams; | ||
| } | ||
| if (strlen($queryParams) > 0 and !$emptyPostParams) | ||
| { | ||
| $baseURL .= '.'; | ||
| } | ||
| return $baseURL; | ||
| } | ||
|
|
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| private static function constructPostUrl($uri, $params) | ||
| { | ||
|
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| $baseURL = self::constructGetUrl($uri, array(),count($params) > 0 ? false : true); | ||
| return $baseURL.self::getSortedParamsString($params); | ||
| } | ||
|
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| private static function getSignatureV3($authToken, $baseURL, $nonce) | ||
| { | ||
| $baseURL = utf8_encode($baseURL.".".$nonce); | ||
| $hmac = hash_hmac('SHA256', $baseURL, $authToken, true); | ||
| return base64_encode($hmac); | ||
| } | ||
|
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| /** | ||
| * Return a recording instance | ||
| * | ||
| * @param string $method | ||
| * @param string $uri | ||
| * @param string $nonce | ||
| * @param string $auth_token | ||
| * @param string $v3_signature | ||
| * @param array $params | ||
| * @return boolean | ||
| * @throws PlivoValidationException | ||
| */ | ||
| public static function validateV3Signature($method, $uri, $nonce, $auth_token, $v3_signature, $params=[]) | ||
| { | ||
| $auth_token = utf8_encode($auth_token); | ||
| $nonce = utf8_encode($nonce); | ||
| $v3_signature = utf8_encode($v3_signature); | ||
| $uri = utf8_encode($uri); | ||
| $params = self::stringifyParams($params); | ||
| if ($method == 'GET') | ||
| { | ||
| $base_url = self::constructGetUrl($uri, $params); | ||
| } | ||
| elseif ($method == 'POST') | ||
| { | ||
| $base_url = self::constructPostUrl($uri, $params); | ||
| } | ||
| else | ||
| { | ||
| throw new PlivoValidationException('method not allowed for signature validation'); | ||
| } | ||
| $signature = self::getSignatureV3($auth_token, $base_url, $nonce); | ||
| return in_array($signature, explode(',', $v3_signature)); | ||
| } | ||
| } |
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