diff options
Diffstat (limited to 'vendor/eher/oauth/src/Eher/OAuth/OAuthServer.php')
| -rw-r--r-- | vendor/eher/oauth/src/Eher/OAuth/OAuthServer.php | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/vendor/eher/oauth/src/Eher/OAuth/OAuthServer.php b/vendor/eher/oauth/src/Eher/OAuth/OAuthServer.php new file mode 100644 index 0000000..d0166c0 --- /dev/null +++ b/vendor/eher/oauth/src/Eher/OAuth/OAuthServer.php @@ -0,0 +1,225 @@ +<?php + +namespace Eher\OAuth; + +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, $token); + } + + // Internals from here + /** + * version 1 + */ + private function get_version(&$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 !== $this->version) { + throw new OAuthException("OAuth version '$version' not supported"); + } + return $version; + } + + /** + * figure out the signature with some defaults + */ + private function get_signature_method($request) { + $signature_method = $request instanceof Request + ? $request->get_parameter("oauth_signature_method") + : NULL; + + if (!$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 OAuthException('No signature method parameter. This parameter is required'); + } + + if (!in_array($signature_method, + array_keys($this->signature_methods))) { + throw new OAuthException( + "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 + */ + private function get_consumer($request) { + $consumer_key = $request instanceof Request + ? $request->get_parameter("oauth_consumer_key") + : NULL; + + if (!$consumer_key) { + throw new OAuthException("Invalid consumer key"); + } + + $consumer = $this->data_store->lookup_consumer($consumer_key); + if (!$consumer) { + throw new OAuthException("Invalid consumer"); + } + + return $consumer; + } + + /** + * try to find the token for the provided request's token key + */ + private function get_token($request, $consumer, $token_type="access") { + $token_field = $request instanceof Request + ? $request->get_parameter('oauth_token') + : NULL; + + $token = $this->data_store->lookup_token( + $consumer, $token_type, $token_field + ); + if (!$token) { + throw new OAuthException("Invalid $token_type token: $token_field"); + } + return $token; + } + + /** + * all-in-one function to check the signature on a request + * should guess the signature method appropriately + */ + private function check_signature($request, $consumer, $token) { + // this should probably be in a different method + $timestamp = $request instanceof Request + ? $request->get_parameter('oauth_timestamp') + : NULL; + $nonce = $request instanceof Request + ? $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, + $token, + Util::urldecode_rfc3986($signature) + ); + + if (!$valid_sig) { + throw new OAuthException("Invalid signature"); + } + } + + /** + * check that the timestamp is new enough + */ + private function check_timestamp($timestamp) { + if( ! $timestamp ) + throw new OAuthException( + 'Missing timestamp parameter. The parameter is required' + ); + + // verify that timestamp is recentish + $now = time(); + if (abs($now - $timestamp) > $this->timestamp_threshold) { + throw new OAuthException( + "Expired timestamp, yours $timestamp, ours $now" + ); + } + } + + /** + * check that the nonce is not repeated + */ + private function check_nonce($consumer, $token, $nonce, $timestamp) { + if( ! $nonce ) + throw new OAuthException( + 'Missing nonce parameter. The parameter is required' + ); + + // verify that the nonce is uniqueish + $found = $this->data_store->lookup_nonce( + $consumer, + $token, + $nonce, + $timestamp + ); + if ($found) { + throw new OAuthException("Nonce already used: $nonce"); + } + } + +} |