1049 lines
33 KiB
PHP
1049 lines
33 KiB
PHP
<?php
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# MODIFIED, May 2012, Wojciech Rygielski <rygielski@mimuw.edu.pl>.
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#
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# This is a splightly modifier version of the original library.
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# The original library couldn't be used if we wanted to be 100%
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# consistent with the OAuth response codes advice on
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# http://oauth.net/core/1.0a/#http_codes - it threw only one type
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# of Exception. I added many subclasses in order to be able to
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# report the error more properly.
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#
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# I also added a helper method for server exception named getOkapiJSON.
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# This produces a non-standard (because there is no REST standard for
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# this), JSON-formatted description of the error, to be passed within
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# the response.
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/* === The original copyright and permission notice === *//*
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The MIT License
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Copyright (c) 2007 Andy Smith
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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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
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/** Base exception type for all exceptions thrown by this module. */
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abstract class OAuthException extends Exception {}
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# All OAuthExceptions fall back into these two categories:
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/** OAuth client errors. */
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class OAuthClientException extends OAuthException {}
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/** OAuth server errors. */
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abstract class OAuthServerException extends OAuthException {
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abstract public function getHttpStatusCode();
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protected function provideExtras(&$extras) {
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$extras['reason_stack'][] = 'invalid_oauth_request';
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}
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public function getOkapiJSON() {
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$extras = array(
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'developer_message' => $this->getMessage(),
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'reason_stack' => array(),
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);
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$this->provideExtras($extras);
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$extras['more_info'] = "http://opencaching.pl/okapi/introduction.html#errors";
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return json_encode(array("error" => $extras));
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}
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}
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# More subclasses of server exceptions.
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/** OAuth server errors which should result in HTTP 400 response. */
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abstract class OAuthServer400Exception extends OAuthServerException {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['status'] = 400;
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}
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public function getHttpStatusCode() { return 400; }
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}
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/** OAuth server errors which should result in HTTP 401 response. */
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abstract class OAuthServer401Exception extends OAuthServerException {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['status'] = 401;
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}
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public function getHttpStatusCode() { return 401; }
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}
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/** Client asked for an unsupported OAuth version (not 1.0). */
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class OAuthVersionNotSupportedException extends OAuthServer400Exception {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'unsupported_oauth_version';
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}
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}
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/** Client didn't provide one of the key OAuth parameters. */
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class OAuthMissingParameterException extends OAuthServer400Exception {
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protected $param_name;
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'missing_parameter';
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$extras['parameter'] = $this->param_name;
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}
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public function __construct($param_name) {
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parent::__construct("Missing '$param_name' parameter. This parameter is required.");
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$this->param_name = $param_name;
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}
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public function getParamName() { return $this->param_name; }
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}
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/** Client used unsupported signature method. */
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class OAuthUnsupportedSignatureMethodException extends OAuthServer400Exception {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'unsupported_signature_method';
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}
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}
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/** Client provided invalid Consumer Key. */
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class OAuthInvalidConsumerException extends OAuthServer401Exception {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'invalid_consumer';
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}
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}
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/** Client provider invalid token (either Request Token or Access Token). */
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class OAuthInvalidTokenException extends OAuthServer401Exception {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'invalid_token';
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}
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}
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/** Client's signature was invalid. */
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class OAuthInvalidSignatureException extends OAuthServer401Exception {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'invalid_signature';
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}
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}
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/** Client used expired timestamp (or timestamp too far in future). */
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class OAuthExpiredTimestampException extends OAuthServer400Exception {
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protected $usersTimestamp;
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protected $ourTimestamp;
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protected $threshold;
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'invalid_timestamp';
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$extras['yours'] = $this->usersTimestamp;
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$extras['ours'] = $this->ourTimestamp;
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$extras['difference'] = $this->ourTimestamp - $this->usersTimestamp;
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$extras['threshold'] = $this->threshold;
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}
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public function __construct($users, $ours, $threshold) {
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$this->usersTimestamp = $users;
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$this->ourTimestamp = $ours;
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$this->threshold = $threshold;
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parent::__construct("Expired timestamp, yours $this->usersTimestamp, ours $this->ourTimestamp (threshold $this->threshold).");
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}
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public function getUsersTimestamp() { return $this->usersTimestamp; }
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public function getOurTimestamp() { return $this->ourTimestamp; }
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}
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/** Client used the same nonce for the second time. */
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class OAuthNonceAlreadyUsedException extends OAuthServer400Exception {
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protected function provideExtras(&$extras) {
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parent::provideExtras($extras);
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$extras['reason_stack'][] = 'nonce_already_used';
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}
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}
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class OAuthConsumer {
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public $key;
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public $secret;
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function __construct($key, $secret, $callback_url=NULL) {
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$this->key = $key;
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$this->secret = $secret;
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$this->callback_url = $callback_url;
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}
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function __toString() {
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return "OAuthConsumer[key=$this->key,secret=$this->secret]";
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}
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}
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class OAuthToken {
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// access tokens and request tokens
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public $key;
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public $secret;
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/**
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* key = the token
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* secret = the token secret
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*/
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function __construct($key, $secret) {
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$this->key = $key;
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$this->secret = $secret;
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}
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/**
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* generates the basic string serialization of a token that a server
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* would respond to request_token and access_token calls with
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*/
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function to_string() {
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return "oauth_token=" .
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OAuthUtil::urlencode_rfc3986($this->key) .
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"&oauth_token_secret=" .
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OAuthUtil::urlencode_rfc3986($this->secret);
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}
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function __toString() {
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return $this->to_string();
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}
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}
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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 OAuthSignatureMethod {
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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 OAuthRequest when the final
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* request is serialized
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* @param OAuthRequest $request
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* @param OAuthConsumer $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 OAuthRequest $request
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* @param OAuthConsumer $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, $token);
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// Check for zero length, although unlikely here
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if (strlen($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 $result == 0;
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}
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}
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/**
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* The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
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* where the Signature Base String is the text and the key is the concatenated values (each first
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* encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
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* character (ASCII code 38) even if empty.
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* - Chapter 9.2 ("HMAC-SHA1")
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*/
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class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
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function get_name() {
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return "HMAC-SHA1";
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}
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public function build_signature($request, $consumer, $token) {
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$base_string = $request->get_signature_base_string();
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$request->base_string = $base_string;
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$key_parts = array(
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$consumer->secret,
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($token) ? $token->secret : ""
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);
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$key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
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$key = implode('&', $key_parts);
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return base64_encode(hash_hmac('sha1', $base_string, $key, true));
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}
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}
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/**
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* The PLAINTEXT method does not provide any security protection and SHOULD only be used
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* over a secure channel such as HTTPS. It does not use the Signature Base String.
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* - Chapter 9.4 ("PLAINTEXT")
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*/
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class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {
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public function get_name() {
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return "PLAINTEXT";
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}
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/**
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* oauth_signature is set to the concatenated encoded values of the Consumer Secret and
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* Token Secret, separated by a '&' character (ASCII code 38), even if either secret is
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* empty. The result MUST be encoded again.
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* - Chapter 9.4.1 ("Generating Signatures")
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*
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* Please note that the second encoding MUST NOT happen in the SignatureMethod, as
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* OAuthRequest handles this!
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*/
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public function build_signature($request, $consumer, $token) {
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$key_parts = array(
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$consumer->secret,
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($token) ? $token->secret : ""
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);
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$key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
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$key = implode('&', $key_parts);
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$request->base_string = $key;
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return $key;
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}
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}
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/**
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* The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in
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* [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for
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* EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a
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* verified way to the Service Provider, in a manner which is beyond the scope of this
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* specification.
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* - Chapter 9.3 ("RSA-SHA1")
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*/
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abstract class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {
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public function get_name() {
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return "RSA-SHA1";
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}
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// Up to the SP to implement this lookup of keys. Possible ideas are:
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// (1) do a lookup in a table of trusted certs keyed off of consumer
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// (2) fetch via http using a url provided by the requester
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// (3) some sort of specific discovery code based on request
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//
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// Either way should return a string representation of the certificate
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protected abstract function fetch_public_cert(&$request);
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// Up to the SP to implement this lookup of keys. Possible ideas are:
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// (1) do a lookup in a table of trusted certs keyed off of consumer
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//
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// Either way should return a string representation of the certificate
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protected abstract function fetch_private_cert(&$request);
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public function build_signature($request, $consumer, $token) {
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$base_string = $request->get_signature_base_string();
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$request->base_string = $base_string;
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// Fetch the private key cert based on the request
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$cert = $this->fetch_private_cert($request);
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// Pull the private key ID from the certificate
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$privatekeyid = openssl_get_privatekey($cert);
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// Sign using the key
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$ok = openssl_sign($base_string, $signature, $privatekeyid);
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// Release the key resource
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openssl_free_key($privatekeyid);
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return base64_encode($signature);
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}
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public function check_signature($request, $consumer, $token, $signature) {
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$decoded_sig = base64_decode($signature);
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$base_string = $request->get_signature_base_string();
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// Fetch the public key cert based on the request
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$cert = $this->fetch_public_cert($request);
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// Pull the public key ID from the certificate
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$publickeyid = openssl_get_publickey($cert);
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// Check the computed signature against the one passed in the query
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$ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
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// Release the key resource
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openssl_free_key($publickeyid);
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return $ok == 1;
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}
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}
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class OAuthRequest {
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protected $parameters;
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protected $http_method;
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protected $http_url;
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// for debug purposes
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public $base_string;
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public static $version = '1.0';
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public static $POST_INPUT = 'php://input';
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function __construct($http_method, $http_url, $parameters=NULL) {
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$parameters = ($parameters) ? $parameters : array();
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$parameters = array_merge( OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
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$this->parameters = $parameters;
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$this->http_method = $http_method;
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$this->http_url = $http_url;
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}
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/**
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* attempt to build up a request from what was passed to the server
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*/
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public static function from_request($http_method=NULL, $http_url=NULL, $parameters=NULL) {
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$scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
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? 'http'
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: 'https';
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$http_url = ($http_url) ? $http_url : $scheme .
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'://' . $_SERVER['SERVER_NAME'] .
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':' .
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$_SERVER['SERVER_PORT'] .
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$_SERVER['REQUEST_URI'];
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$http_method = ($http_method) ? $http_method : $_SERVER['REQUEST_METHOD'];
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// We weren't handed any parameters, so let's find the ones relevant to
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// this request.
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// If you run XML-RPC or similar you should use this to provide your own
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// parsed parameter-list
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if (!$parameters) {
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// Find request headers
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$request_headers = OAuthUtil::get_headers();
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// Parse the query-string to find GET parameters
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$parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);
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// It's a POST request of the proper content-type, so parse POST
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// parameters and add those overriding any duplicates from GET
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if ($http_method == "POST"
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&& isset($request_headers['Content-Type'])
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&& strstr($request_headers['Content-Type'],
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'application/x-www-form-urlencoded')
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) {
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$post_data = OAuthUtil::parse_parameters(
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file_get_contents(self::$POST_INPUT)
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);
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$parameters = array_merge($parameters, $post_data);
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}
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// We have a Authorization-header with OAuth data. Parse the header
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// and add those overriding any duplicates from GET or POST
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if (isset($request_headers['Authorization']) && substr($request_headers['Authorization'], 0, 6) == 'OAuth ') {
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$header_parameters = OAuthUtil::split_header(
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$request_headers['Authorization']
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);
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$parameters = array_merge($parameters, $header_parameters);
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}
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}
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return new OAuthRequest($http_method, $http_url, $parameters);
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}
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/**
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* pretty much a helper function to set up the request
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*/
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public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters=NULL) {
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$parameters = ($parameters) ? $parameters : array();
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$defaults = array("oauth_version" => OAuthRequest::$version,
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"oauth_nonce" => OAuthRequest::generate_nonce(),
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"oauth_timestamp" => OAuthRequest::generate_timestamp(),
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"oauth_consumer_key" => $consumer->key);
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if ($token)
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$defaults['oauth_token'] = $token->key;
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$parameters = array_merge($defaults, $parameters);
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return new OAuthRequest($http_method, $http_url, $parameters);
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}
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public function set_parameter($name, $value, $allow_duplicates = true) {
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if ($allow_duplicates && isset($this->parameters[$name])) {
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// We have already added parameter(s) with this name, so add to the list
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if (is_scalar($this->parameters[$name])) {
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// This is the first duplicate, so transform scalar (string)
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// into an array so we can add the duplicates
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$this->parameters[$name] = array($this->parameters[$name]);
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}
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$this->parameters[$name][] = $value;
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} else {
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$this->parameters[$name] = $value;
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}
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}
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public function get_parameter($name) {
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return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
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}
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public function get_parameters() {
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return $this->parameters;
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}
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public function unset_parameter($name) {
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unset($this->parameters[$name]);
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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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*/
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public function get_signable_parameters() {
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// Grab all parameters
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|
$params = $this->parameters;
|
|
|
|
// Remove oauth_signature if present
|
|
// Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
|
|
if (isset($params['oauth_signature'])) {
|
|
unset($params['oauth_signature']);
|
|
}
|
|
|
|
return OAuthUtil::build_http_query($params);
|
|
}
|
|
|
|
/**
|
|
* Returns the base string of this request
|
|
*
|
|
* The base string defined as the method, the url
|
|
* and the parameters (normalized), each urlencoded
|
|
* and the concated with &.
|
|
*/
|
|
public function get_signature_base_string() {
|
|
$parts = array(
|
|
$this->get_normalized_http_method(),
|
|
$this->get_normalized_http_url(),
|
|
$this->get_signable_parameters()
|
|
);
|
|
|
|
$parts = OAuthUtil::urlencode_rfc3986($parts);
|
|
|
|
return implode('&', $parts);
|
|
}
|
|
|
|
/**
|
|
* just uppercases the http method
|
|
*/
|
|
public function get_normalized_http_method() {
|
|
return strtoupper($this->http_method);
|
|
}
|
|
|
|
/**
|
|
* parses the url and rebuilds it to be
|
|
* scheme://host/path
|
|
*/
|
|
public function get_normalized_http_url() {
|
|
$parts = parse_url($this->http_url);
|
|
|
|
$scheme = (isset($parts['scheme'])) ? $parts['scheme'] : 'http';
|
|
$port = (isset($parts['port'])) ? $parts['port'] : (($scheme == 'https') ? '443' : '80');
|
|
$host = (isset($parts['host'])) ? strtolower($parts['host']) : '';
|
|
$path = (isset($parts['path'])) ? $parts['path'] : '';
|
|
|
|
if (($scheme == 'https' && $port != '443')
|
|
|| ($scheme == 'http' && $port != '80')) {
|
|
$host = "$host:$port";
|
|
}
|
|
return "$scheme://$host$path";
|
|
}
|
|
|
|
/**
|
|
* builds a url usable for a GET request
|
|
*/
|
|
public function to_url() {
|
|
$post_data = $this->to_postdata();
|
|
$out = $this->get_normalized_http_url();
|
|
if ($post_data) {
|
|
$out .= '?'.$post_data;
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* builds the data one would send in a POST request
|
|
*/
|
|
public function to_postdata() {
|
|
return OAuthUtil::build_http_query($this->parameters);
|
|
}
|
|
|
|
/**
|
|
* builds the Authorization: header
|
|
*/
|
|
public function to_header($realm=null) {
|
|
$first = true;
|
|
if($realm) {
|
|
$out = 'Authorization: OAuth realm="' . OAuthUtil::urlencode_rfc3986($realm) . '"';
|
|
$first = false;
|
|
} else
|
|
$out = 'Authorization: OAuth';
|
|
|
|
$total = array();
|
|
foreach ($this->parameters as $k => $v) {
|
|
if (substr($k, 0, 5) != "oauth") continue;
|
|
if (is_array($v)) {
|
|
throw new OAuthClientException('Arrays not supported in headers.');
|
|
}
|
|
$out .= ($first) ? ' ' : ',';
|
|
$out .= OAuthUtil::urlencode_rfc3986($k) .
|
|
'="' .
|
|
OAuthUtil::urlencode_rfc3986($v) .
|
|
'"';
|
|
$first = false;
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
public function __toString() {
|
|
return $this->to_url();
|
|
}
|
|
|
|
|
|
public function sign_request($signature_method, $consumer, $token) {
|
|
$this->set_parameter(
|
|
"oauth_signature_method",
|
|
$signature_method->get_name(),
|
|
false
|
|
);
|
|
$signature = $this->build_signature($signature_method, $consumer, $token);
|
|
$this->set_parameter("oauth_signature", $signature, false);
|
|
}
|
|
|
|
public function build_signature($signature_method, $consumer, $token) {
|
|
$signature = $signature_method->build_signature($this, $consumer, $token);
|
|
return $signature;
|
|
}
|
|
|
|
/**
|
|
* util function: current timestamp
|
|
*/
|
|
private static function generate_timestamp() {
|
|
return time();
|
|
}
|
|
|
|
/**
|
|
* util function: current nonce
|
|
*/
|
|
private static function generate_nonce() {
|
|
$mt = microtime();
|
|
$rand = mt_rand();
|
|
|
|
return md5($mt . $rand); // md5s look nicer than numbers
|
|
}
|
|
}
|
|
|
|
class OAuthServer {
|
|
protected $timestamp_threshold = 300; // in seconds, five minutes
|
|
protected $version = '1.0'; // hi blaine
|
|
protected $signature_methods = array();
|
|
|
|
protected $data_store;
|
|
|
|
function __construct($data_store) {
|
|
$this->data_store = $data_store;
|
|
}
|
|
|
|
public function add_signature_method($signature_method) {
|
|
$this->signature_methods[$signature_method->get_name()] =
|
|
$signature_method;
|
|
}
|
|
|
|
// high level functions
|
|
|
|
/**
|
|
* process a request_token request
|
|
* returns the request token on success
|
|
*/
|
|
public function fetch_request_token(&$request) {
|
|
$this->get_version($request);
|
|
|
|
$consumer = $this->get_consumer($request);
|
|
|
|
// no token required for the initial token request
|
|
$token = NULL;
|
|
|
|
$this->check_signature($request, $consumer, $token);
|
|
|
|
// Rev A change
|
|
$callback = $request->get_parameter('oauth_callback');
|
|
$new_token = $this->data_store->new_request_token($consumer, $callback);
|
|
|
|
return $new_token;
|
|
}
|
|
|
|
/**
|
|
* process an access_token request
|
|
* returns the access token on success
|
|
*/
|
|
public function fetch_access_token(&$request) {
|
|
$this->get_version($request);
|
|
|
|
$consumer = $this->get_consumer($request);
|
|
|
|
// requires authorized request token
|
|
$token = $this->get_token($request, $consumer, "request");
|
|
|
|
$this->check_signature($request, $consumer, $token);
|
|
|
|
// Rev A change
|
|
$verifier = $request->get_parameter('oauth_verifier');
|
|
$new_token = $this->data_store->new_access_token($token, $consumer, $verifier);
|
|
|
|
return $new_token;
|
|
}
|
|
|
|
/**
|
|
* verify an api call, checks all the parameters
|
|
*/
|
|
public function verify_request(&$request) {
|
|
$this->get_version($request);
|
|
$consumer = $this->get_consumer($request);
|
|
$token = $this->get_token($request, $consumer, "access");
|
|
$this->check_signature($request, $consumer, $token);
|
|
return array($consumer, $token);
|
|
}
|
|
|
|
// Internals from here
|
|
/**
|
|
* version 1
|
|
*/
|
|
protected function get_version(&$request) {
|
|
$version = $request->get_parameter("oauth_version");
|
|
if (!$version) {
|
|
// Service Providers MUST assume the protocol version to be 1.0 if this parameter is not present.
|
|
// Chapter 7.0 ("Accessing Protected Ressources")
|
|
$version = '1.0';
|
|
}
|
|
if ($version !== $this->version) {
|
|
throw new OAuthVersionNotSupportedException("OAuth version '$version' not supported.");
|
|
}
|
|
return $version;
|
|
}
|
|
|
|
/**
|
|
* figure out the signature with some defaults
|
|
*/
|
|
private function get_signature_method($request) {
|
|
$signature_method = $request instanceof OAuthRequest
|
|
? $request->get_parameter("oauth_signature_method")
|
|
: NULL;
|
|
|
|
if (!$signature_method) {
|
|
// According to chapter 7 ("Accessing Protected Ressources") the signature-method
|
|
// parameter is required, and we can't just fallback to PLAINTEXT
|
|
throw new OAuthMissingParameterException('oauth_signature_method');
|
|
}
|
|
|
|
if (!in_array($signature_method,
|
|
array_keys($this->signature_methods))) {
|
|
throw new OAuthUnsupportedSignatureMethodException(
|
|
"Signature method '$signature_method' not supported " .
|
|
"try one of the following: " .
|
|
implode(", ", array_keys($this->signature_methods)) . "."
|
|
);
|
|
}
|
|
return $this->signature_methods[$signature_method];
|
|
}
|
|
|
|
/**
|
|
* try to find the consumer for the provided request's consumer key
|
|
*/
|
|
protected function get_consumer($request) {
|
|
$consumer_key = $request instanceof OAuthRequest
|
|
? $request->get_parameter("oauth_consumer_key")
|
|
: NULL;
|
|
|
|
if (!$consumer_key) {
|
|
throw new OAuthMissingParameterException('oauth_consumer_key');
|
|
}
|
|
|
|
$consumer = $this->data_store->lookup_consumer($consumer_key);
|
|
if (!$consumer) {
|
|
throw new OAuthInvalidConsumerException("Invalid consumer");
|
|
}
|
|
|
|
return $consumer;
|
|
}
|
|
|
|
/**
|
|
* try to find the token for the provided request's token key
|
|
*/
|
|
protected function get_token($request, $consumer, $token_type="access") {
|
|
$token_field = $request instanceof OAuthRequest
|
|
? $request->get_parameter('oauth_token')
|
|
: NULL;
|
|
if (!$token_field) {
|
|
throw new OAuthMissingParameterException('oauth_token');
|
|
}
|
|
$token = $this->data_store->lookup_token(
|
|
$consumer, $token_type, $token_field
|
|
);
|
|
if (!$token) {
|
|
throw new OAuthInvalidTokenException("Invalid $token_type token: $token_field.");
|
|
}
|
|
return $token;
|
|
}
|
|
|
|
/**
|
|
* all-in-one function to check the signature on a request
|
|
* should guess the signature method appropriately
|
|
*/
|
|
protected function check_signature($request, $consumer, $token) {
|
|
// this should probably be in a different method
|
|
$timestamp = $request instanceof OAuthRequest
|
|
? $request->get_parameter('oauth_timestamp')
|
|
: NULL;
|
|
$nonce = $request instanceof OAuthRequest
|
|
? $request->get_parameter('oauth_nonce')
|
|
: NULL;
|
|
|
|
$this->check_timestamp($timestamp);
|
|
$this->check_nonce($consumer, $token, $nonce, $timestamp);
|
|
|
|
$signature_method = $this->get_signature_method($request);
|
|
|
|
$signature = $request->get_parameter('oauth_signature');
|
|
$valid_sig = $signature_method->check_signature(
|
|
$request,
|
|
$consumer,
|
|
$token,
|
|
$signature
|
|
);
|
|
|
|
if (!$valid_sig) {
|
|
throw new OAuthInvalidSignatureException("Invalid signature.");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* check that the timestamp is new enough
|
|
*/
|
|
private function check_timestamp($timestamp) {
|
|
if( ! $timestamp )
|
|
throw new OAuthMissingParameterException('oauth_timestamp');
|
|
|
|
// verify that timestamp is recentish
|
|
$now = time();
|
|
if (abs($now - $timestamp) > $this->timestamp_threshold) {
|
|
throw new OAuthExpiredTimestampException($timestamp, $now,
|
|
$this->timestamp_threshold);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* check that the nonce is not repeated
|
|
*/
|
|
private function check_nonce($consumer, $token, $nonce, $timestamp) {
|
|
if( ! $nonce )
|
|
throw new OAuthMissingParameterException('oauth_nonce');
|
|
|
|
// verify that the nonce is uniqueish
|
|
$found = $this->data_store->lookup_nonce(
|
|
$consumer,
|
|
$token,
|
|
$nonce,
|
|
$timestamp
|
|
);
|
|
if ($found) {
|
|
throw new OAuthNonceAlreadyUsedException("Nonce already used: $nonce.");
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
class OAuthDataStore {
|
|
function lookup_consumer($consumer_key) {
|
|
// implement me
|
|
}
|
|
|
|
function lookup_token($consumer, $token_type, $token) {
|
|
// implement me
|
|
}
|
|
|
|
function lookup_nonce($consumer, $token, $nonce, $timestamp) {
|
|
// implement me
|
|
}
|
|
|
|
function new_request_token($consumer, $callback = null) {
|
|
// return a new token attached to this consumer
|
|
}
|
|
|
|
function new_access_token($token, $consumer, $verifier = null) {
|
|
// return a new access token attached to this consumer
|
|
// for the user associated with this token if the request token
|
|
// is authorized
|
|
// should also invalidate the request token
|
|
}
|
|
|
|
}
|
|
|
|
class OAuthUtil {
|
|
public static function urlencode_rfc3986($input) {
|
|
if (is_array($input)) {
|
|
return array_map(array('OAuthUtil', 'urlencode_rfc3986'), $input);
|
|
} else if (is_scalar($input)) {
|
|
return str_replace(
|
|
'+',
|
|
' ',
|
|
str_replace('%7E', '~', rawurlencode($input))
|
|
);
|
|
} else {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
|
|
// This decode function isn't taking into consideration the above
|
|
// modifications to the encoding process. However, this method doesn't
|
|
// seem to be used anywhere so leaving it as is.
|
|
public static function urldecode_rfc3986($string) {
|
|
return urldecode($string);
|
|
}
|
|
|
|
// Utility function for turning the Authorization: header into
|
|
// parameters, has to do some unescaping
|
|
// Can filter out any non-oauth parameters if needed (default behaviour)
|
|
// May 28th, 2010 - method updated to tjerk.meesters for a speed improvement.
|
|
// see http://code.google.com/p/oauth/issues/detail?id=163
|
|
public static function split_header($header, $only_allow_oauth_parameters = true) {
|
|
$params = array();
|
|
if (preg_match_all('/('.($only_allow_oauth_parameters ? 'oauth_' : '').'[a-z_-]*)=(:?"([^"]*)"|([^,]*))/', $header, $matches)) {
|
|
foreach ($matches[1] as $i => $h) {
|
|
$params[$h] = OAuthUtil::urldecode_rfc3986(empty($matches[3][$i]) ? $matches[4][$i] : $matches[3][$i]);
|
|
}
|
|
if (isset($params['realm'])) {
|
|
unset($params['realm']);
|
|
}
|
|
}
|
|
return $params;
|
|
}
|
|
|
|
// helper to try to sort out headers for people who aren't running apache
|
|
public static function get_headers() {
|
|
if (function_exists('apache_request_headers')) {
|
|
// we need this to get the actual Authorization: header
|
|
// because apache tends to tell us it doesn't exist
|
|
$headers = apache_request_headers();
|
|
|
|
// sanitize the output of apache_request_headers because
|
|
// we always want the keys to be Cased-Like-This and arh()
|
|
// returns the headers in the same case as they are in the
|
|
// request
|
|
$out = array();
|
|
foreach ($headers AS $key => $value) {
|
|
$key = str_replace(
|
|
" ",
|
|
"-",
|
|
ucwords(strtolower(str_replace("-", " ", $key)))
|
|
);
|
|
$out[$key] = $value;
|
|
}
|
|
} else {
|
|
// otherwise we don't have apache and are just going to have to hope
|
|
// that $_SERVER actually contains what we need
|
|
$out = array();
|
|
if( isset($_SERVER['CONTENT_TYPE']) )
|
|
$out['Content-Type'] = $_SERVER['CONTENT_TYPE'];
|
|
if( isset($_ENV['CONTENT_TYPE']) )
|
|
$out['Content-Type'] = $_ENV['CONTENT_TYPE'];
|
|
|
|
foreach ($_SERVER as $key => $value) {
|
|
if (substr($key, 0, 5) == "HTTP_") {
|
|
// this is chaos, basically it is just there to capitalize the first
|
|
// letter of every word that is not an initial HTTP and strip HTTP
|
|
// code from przemek
|
|
$key = str_replace(
|
|
" ",
|
|
"-",
|
|
ucwords(strtolower(str_replace("_", " ", substr($key, 5))))
|
|
);
|
|
$out[$key] = $value;
|
|
}
|
|
}
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
// This function takes a input like a=b&a=c&d=e and returns the parsed
|
|
// parameters like this
|
|
// array('a' => array('b','c'), 'd' => 'e')
|
|
public static function parse_parameters( $input ) {
|
|
if (!isset($input) || !$input) return array();
|
|
|
|
$pairs = explode('&', $input);
|
|
|
|
$parsed_parameters = array();
|
|
foreach ($pairs as $pair) {
|
|
$split = explode('=', $pair, 2);
|
|
$parameter = OAuthUtil::urldecode_rfc3986($split[0]);
|
|
$value = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : '';
|
|
|
|
if (isset($parsed_parameters[$parameter])) {
|
|
// We have already recieved parameter(s) with this name, so add to the list
|
|
// of parameters with this name
|
|
|
|
if (is_scalar($parsed_parameters[$parameter])) {
|
|
// This is the first duplicate, so transform scalar (string) into an array
|
|
// so we can add the duplicates
|
|
$parsed_parameters[$parameter] = array($parsed_parameters[$parameter]);
|
|
}
|
|
|
|
$parsed_parameters[$parameter][] = $value;
|
|
} else {
|
|
$parsed_parameters[$parameter] = $value;
|
|
}
|
|
}
|
|
return $parsed_parameters;
|
|
}
|
|
|
|
public static function build_http_query($params) {
|
|
if (!$params) return '';
|
|
|
|
// Urlencode both keys and values
|
|
$keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
|
|
$values = OAuthUtil::urlencode_rfc3986(array_values($params));
|
|
$params = array_combine($keys, $values);
|
|
|
|
// Parameters are sorted by name, using lexicographical byte value ordering.
|
|
// Ref: Spec: 9.1.1 (1)
|
|
uksort($params, 'strcmp');
|
|
|
|
$pairs = array();
|
|
foreach ($params as $parameter => $value) {
|
|
if (is_array($value)) {
|
|
// If two or more parameters share the same name, they are sorted by their value
|
|
// Ref: Spec: 9.1.1 (1)
|
|
// June 12th, 2010 - changed to sort because of issue 164 by hidetaka
|
|
sort($value, SORT_STRING);
|
|
foreach ($value as $duplicate_value) {
|
|
$pairs[] = $parameter . '=' . $duplicate_value;
|
|
}
|
|
} else {
|
|
$pairs[] = $parameter . '=' . $value;
|
|
}
|
|
}
|
|
// For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
|
|
// Each name-value pair is separated by an '&' character (ASCII code 38)
|
|
return implode('&', $pairs);
|
|
}
|
|
}
|
|
|
|
?>
|