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<?php

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/**

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* ET Core OAuth Library

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* Based on code from the TwitterOAuth Library:

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* @license

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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated

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* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the

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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to

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* permit persons to whom the Software is furnished to do so, subject to the following conditions:

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* The above copyright notice and this permission notice shall be included in all copies or substantial

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* portions of the Software.

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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE

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* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS

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* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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class ET_Core_LIB_OAuthBase {

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/**

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* Writes a message to the PHP error log.

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* @since 1.1.0

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* @param mixed $msg

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public static function write_log( $msg, $level = 'DEBUG', $_this = null ) {

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$name = ( null !== $_this ) ? get_class( $_this ) : 'ET_Core_LIB_OAuthBase';

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if ( ! is_string( $msg ) ) {

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$msg = print_r( $msg, true );

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}

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error_log( "{$name} [{$level}]: $msg" );

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}

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}

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class ET_Core_LIB_OAuthUtil {

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public static function build_http_query( $params, $return_json=false ) {

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if ( ! $params ) {

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return '';

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}

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if ( $return_json ) {

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// return json string without further processing if needed

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return json_encode( $params );

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}

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// Url encode both the keys and the values

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$keys = ET_Core_LIB_OAuthUtil::urlencode_rfc3986( array_keys( $params ) );

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$values = ET_Core_LIB_OAuthUtil::urlencode_rfc3986( array_values( $params ) );

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$params = array_combine( $keys, $values );

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// Parameters are sorted by name, using lexicographical byte value ordering.

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// Ref: Spec: 9.1.1 (1)

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uksort( $params, 'strcmp' );

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$pairs = array();

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foreach ( $params as $parameter => $value ) {

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if ( is_array( $value ) ) {

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// When two or more parameters share the same name, they are sorted by their value

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// Ref: Spec: 9.1.1 (1)

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// June 12th, 2010 - changed to sort because of issue 164 by hidetaka

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sort( $value, SORT_STRING );

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foreach ( $value as $duplicate_value ) {

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$pairs[] = "{$parameter}={$duplicate_value}";

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}

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} else {

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$pairs[] = "{$parameter}={$value}";

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}

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}

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// For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)

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// Each name-value pair is separated by an '&' character (ASCII code 38)

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return implode( '&', $pairs );

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}

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public static function parse_parameters( $input = '' ) {

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if ( '' === $input ) {

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return array();

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}

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$pairs = explode( '&', $input );

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$parsed_parameters = array();

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foreach ( $pairs as $pair ) {

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$split = explode( '=', $pair, 2 );

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$parameter = ET_Core_LIB_OAuthUtil::urldecode_rfc3986( $split[0] );

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$value = isset( $split[1] ) ? ET_Core_LIB_OAuthUtil::urldecode_rfc3986( $split[1] ) : '';

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if ( isset( $parsed_parameters[ $parameter ] ) ) {

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// We have already received parameter(s) with this name, so add to the list

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// of parameters with this name

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if ( is_scalar( $parsed_parameters[ $parameter ] ) ) {

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// This is the first duplicate, so transform scalar (string) into an array

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// so we can add the duplicates

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$parsed_parameters[ $parameter ] = array( $parsed_parameters[ $parameter ] );

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}

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$parsed_parameters[ $parameter ][] = $value;

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} else {

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$parsed_parameters[ $parameter ] = $value;

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}

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}

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return $parsed_parameters;

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}

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public static function urldecode_rfc3986( $string ) {

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return rawurldecode( $string );

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}

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public static function urlencode_rfc3986( $input ) {

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$output = '';

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if ( is_array( $input ) ) {

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$output = array_map( array( 'ET_Core_LIB_OAuthUtil', 'urlencode_rfc3986' ), $input );

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} else if ( is_scalar( $input ) ) {

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$output = rawurlencode( utf8_encode( $input ) );

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}

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return $output;

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}

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}

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/**

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* A base class for implementing a Signature Method

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* See section 9 ("Signing Requests") in the spec

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abstract class ET_Core_LIB_OAuthSignatureMethod {

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/**

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* Build the signature

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* NOTE: The output of this function MUST NOT be urlencoded. The encoding is handled in

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* {@link ET_Core_OAuth_Request} when the final request is serialized.

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* @param ET_Core_LIB_OAuthRequest $request

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* @param ET_Core_LIB_OAuthConsumer $consumer

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* @param ET_Core_LIB_OAuthToken|null $token

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* @return string

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

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/**

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* Verifies that a given signature is correct

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* @param ET_Core_LIB_OAuthRequest $request

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* @param ET_Core_LIB_OAuthConsumer $consumer

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* @param ET_Core_LIB_OAuthToken $token

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* @param string $signature

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* @return bool

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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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// Check for zero length, although its unlikely here

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if ( empty( $built ) || empty( $signature ) ) {

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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 0 === $result;

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}

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/**

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* Returns the name of this Signature Method (ie HMAC-SHA1)

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* @return string

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abstract public function get_name();

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}

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/**

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* The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104] where

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* the Signature Base String is the text and the key is the concatenated values of the Consumer Secret and

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* Token Secret (each encoded per Parameter Encoding first), separated by an '&' character (ASCII code 38)

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* even if empty. As per Chapter 9.2 of the HMAC-SHA1 spec.

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class ET_Core_LIB_OAuthHMACSHA1 extends ET_Core_LIB_OAuthSignatureMethod {

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/**

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* @inheritDoc

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

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$base_string = $request->get_signature_base_string();

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$token = $token ? $token->secret : '';

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$request->base_string = $base_string;

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

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$key = implode( '&', $key_parts );

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

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}

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/**

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* @inheritDoc

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public function get_name() {

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return 'HMAC-SHA1';

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}

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}

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class ET_Core_LIB_OAuthConsumer {

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public $callback_url;

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public $id;

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public $key;

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public $secret;

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public function __construct( $id, $secret, $callback_url = '' ) {

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$this->id = $this->key = $id;

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$this->secret = $secret;

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$this->callback_url = $callback_url;

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}

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function __toString() {

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$name = get_class( $this );

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$key = 'ET_Core_LIB_OAuthConsumer' === $name ? 'key' : 'id';

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return "{$name}[{$key}={$this->key}, secret={$this->secret}]";

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}

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}

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class ET_Core_LIB_OAuthToken {

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public $key;

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public $secret;

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public $refresh_token;

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/**

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* @param string $key The OAuth Token

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* @param string $secret The OAuth Token Secret

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public function __construct( $key, $secret ) {

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$this->key = $key;

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$this->secret = $secret;

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}

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/**

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* Generates the basic string serialization of a token that a server

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* would respond to 'request_token' and 'access_token' calls with

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* @return string

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public function __toString() {

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return sprintf( "oauth_token=%s&oauth_token_secret=%s",

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ET_Core_LIB_OAuthUtil::urlencode_rfc3986( $this->key ),

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ET_Core_LIB_OAuthUtil::urlencode_rfc3986( $this->secret )

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);

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}

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}

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class ET_Core_LIB_OAuthRequest extends ET_Core_LIB_OAuthBase {

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protected $parameters;

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protected $http_method;

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protected $http_url;

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public static $version = '1.0';

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public $base_string;

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/**

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* ET_Core_OAuth_Request Constructor

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* @param string $http_method

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* @param string $http_url

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* @param array|null $parameters

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public function __construct( $http_method, $http_url, $parameters = array() ) {

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$this->parameters = $parameters;

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$this->http_method = $http_method;

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$this->http_url = $http_url;

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}

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/**

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* pretty much a helper function to set up the request

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* @param ET_Core_LIB_OAuthConsumer $consumer

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* @param ET_Core_LIB_OAuthToken $token

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* @param string $http_method

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* @param string $http_url

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* @param array $parameters

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* @return ET_Core_LIB_OAuthRequest

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public static function from_consumer_and_token( $consumer, $token = null, $http_method, $http_url, $parameters = array() ) {

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$defaults = array(

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"oauth_version" => ET_Core_LIB_OAuthRequest::$version,

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"oauth_nonce" => ET_Core_LIB_OAuthRequest::generate_nonce(),

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"oauth_timestamp" => time(),

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"oauth_consumer_key" => $consumer->key

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);

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if ( $token ) {

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$defaults['oauth_token'] = $token->key;

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}

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$parameters = wp_parse_args( $parameters, $defaults );

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return new ET_Core_LIB_OAuthRequest( $http_method, $http_url, $parameters );

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}

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/**

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* Returns the HTTP Method in uppercase

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* @return string

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public function get_normalized_http_method() {

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return strtoupper( $this->http_method );

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}

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/**

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* parses the url and rebuilds it to be

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* scheme://host/path

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* @return string

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public function get_normalized_http_url() {

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$parts = parse_url( $this->http_url );

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$scheme = $parts['scheme'];

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$host = strtolower( $parts['host'] );

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$path = $parts['path'];

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return "{$scheme}://{$host}{$path}";

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}

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/**

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* @param $name

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* @return string|null

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public function get_parameter( $name ) {

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return isset( $this->parameters[ $name ] ) ? $this->parameters[ $name ] : null;

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}

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/**

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* @return array

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public function get_parameters() {

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return $this->parameters;

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}

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/**

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* The request parameters, sorted and concatenated into a normalized string.

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* @return string

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public function get_signable_parameters() {

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// Grab a copy of all parameters

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$params = $this->parameters;

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// Remove oauth_signature if present

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// Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")

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if ( isset( $params['oauth_signature'] ) ) {

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unset( $params['oauth_signature'] );

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}

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return ET_Core_LIB_OAuthUtil::build_http_query( $params );

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}

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/**

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* Returns the base string of this request

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* The base string defined as the method, the url, and the parameters (normalized),

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* each urlencoded and then concatenated with '&'.

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* @return string

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public function get_signature_base_string() {

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$parts = array(

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$this->get_normalized_http_method(),

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$this->get_normalized_http_url(),

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$this->get_signable_parameters()

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);

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$parts = ET_Core_LIB_OAuthUtil::urlencode_rfc3986( $parts );

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return implode( '&', $parts );

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}

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/**

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* @param $name

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public function remove_parameter( $name ) {

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unset( $this->parameters[ $name ] );

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}

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/**

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* @param string $name

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* @param string $value

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public function set_parameter( $name, $value ) {

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$this->parameters[ $name ] = $value;

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}

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/**

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* Builds the data one would send in a POST request

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* @param bool $need_json indicates the query data format ( http query string or json string )

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* @return string

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public function to_post_data( $need_json = false ) {

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return ET_Core_LIB_OAuthUtil::build_http_query( $this->parameters, $need_json );

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}

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/**

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* Builds a url usable for a GET request

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* @return string

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public function to_url() {

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$postData = $this->to_post_data();

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$out = $this->get_normalized_http_url();

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if ( $postData ) {

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$out .= '?' . $postData;

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}

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return $out;

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}

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/**

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* Builds the HTTP Authorization Header

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* @return string

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public function to_header() {

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$out = '';

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foreach ( $this->parameters as $parameter => $value ) {

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if ( 0 !== strpos( 'oauth', $parameter ) ) {

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continue;

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}

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if ( is_array( $value ) ) {

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self::write_log( 'Arrays not supported in headers!', 'ERROR' );

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continue;

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}

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$out .= ( '' === $out ) ? 'OAuth ' : ', ';

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$out .= ET_Core_LIB_OAuthUtil::urlencode_rfc3986( $parameter );

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$out .= '="' . ET_Core_LIB_OAuthUtil::urlencode_rfc3986( $value ) . '"';

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}

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return $out;

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}

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/**

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* @return string

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public function __toString() {

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return $this->to_url();

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}

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/**

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* @param ET_Core_LIB_OAuthSignatureMethod $signature_method

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* @param ET_Core_LIB_OAuthConsumer $consumer

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* @param ET_Core_LIB_OAuthToken $token

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public function sign_request( $signature_method, $consumer, $token = null ) {

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$this->set_parameter( 'oauth_signature_method', $signature_method->get_name() );

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$signature = $this->build_signature( $signature_method, $consumer, $token );

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$this->set_parameter( 'oauth_signature', $signature );

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}

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/**

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* @param ET_Core_LIB_OAuthSignatureMethod $signatureMethod

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* @param ET_Core_LIB_OAuthConsumer $consumer

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* @param ET_Core_LIB_OAuthToken $token

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* @return string

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public function build_signature( $signatureMethod, $consumer, $token = null ) {

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return $signatureMethod->build_signature( $this, $consumer, $token );

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}

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/**

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* @return string

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