Move library\OAuth1.php to class structure Friendica\Security\OAuth1

composer.json

@@ -77,9 +77,6 @@
 			"Friendica\\": "src/",
 			"Friendica\\Addon\\": "addon/"
 		},
-		"psr-0": {
-			"": "library/"
-		},
 		"files": [
 			"include/conversation.php",
 			"include/dba.php",

include/api.php

@@ -58,6 +58,8 @@ use Friendica\Network\HTTPException\UnauthorizedException;
 use Friendica\Object\Image;
 use Friendica\Protocol\Activity;
 use Friendica\Protocol\Diaspora;
+use Friendica\Security\OAuth1\OAuthRequest;
+use Friendica\Security\OAuth1\OAuthUtil;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Images;
 use Friendica\Util\Network;

mod/api.php

@@ -24,6 +24,8 @@ use Friendica\Core\Renderer;
 use Friendica\Database\DBA;
 use Friendica\DI;
 use Friendica\Module\Security\Login;
+use Friendica\Security\OAuth1\OAuthRequest;
+use Friendica\Security\OAuth1\OAuthUtil;
 
 require_once __DIR__ . '/../include/api.php';
 

src/Security/FKOAuth1.php

@@ -19,15 +19,14 @@
  *
  */
 
-namespace Friendica\Network;
+namespace Friendica\Security;
 
 use Friendica\Core\Logger;
 use Friendica\Database\DBA;
 use Friendica\DI;
-use Friendica\Security\FKOAuthDataStore;
-use OAuthServer;
-use OAuthSignatureMethod_HMAC_SHA1;
-use OAuthSignatureMethod_PLAINTEXT;
+use Friendica\Security\OAuth1\OAuthServer;
+use Friendica\Security\OAuth1\OAuthSignatureMethod_HMAC_SHA1;
+use Friendica\Security\OAuth1\OAuthSignatureMethod_PLAINTEXT;
 
 /**
  * OAuth protocol

src/Security/FKOAuthDataStore.php

@@ -25,15 +25,15 @@ use Friendica\Core\Logger;
 use Friendica\Database\DBA;
 use Friendica\DI;
 use Friendica\Util\Strings;
-use OAuthConsumer;
-use OAuthDataStore;
-use OAuthToken;
+use Friendica\Security\OAuth1\OAuthConsumer;
+use Friendica\Security\OAuth1\OAuthDataStore;
+use Friendica\Security\OAuth1\OAuthToken;
 
 define('REQUEST_TOKEN_DURATION', 300);
 define('ACCESS_TOKEN_DURATION', 31536000);
 
 /**
- * OAuthDataStore class
+ * Friendica\Security\OAuth1\OAuthDataStore class
  */
 class FKOAuthDataStore extends OAuthDataStore
 {

src/Security/OAuth1/OAuthConsumer.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+class OAuthConsumer
+{
+	public $key;
+	public $secret;
+	public $callback_url;
+
+	function __construct($key, $secret, $callback_url = null)
+	{
+		$this->key          = $key;
+		$this->secret       = $secret;
+		$this->callback_url = $callback_url;
+	}
+
+	function __toString()
+	{
+		return "OAuthConsumer[key=$this->key,secret=$this->secret]";
+	}
+}

src/Security/OAuth1/OAuthDataStore.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+class OAuthDataStore
+{
+	function lookup_consumer($consumer_key)
+	{
+		// implement me
+	}
+
+	function lookup_token(OAuthConsumer $consumer, $token_type, $token_id)
+	{
+		// implement me
+	}
+
+	function lookup_nonce(OAuthConsumer $consumer, OAuthToken $token, $nonce, int $timestamp)
+	{
+		// implement me
+	}
+
+	function new_request_token(OAuthConsumer $consumer, $callback = null)
+	{
+		// return a new token attached to this consumer
+	}
+
+	function new_access_token(OAuthToken $token, OAuthConsumer $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
+	}
+}

src/Security/OAuth1/OAuthException.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Exception;
+
+class OAuthException extends Exception
+{
+}

src/Security/OAuth1/OAuthRequest.php

@@ -0,0 +1,319 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica;
+use Friendica\Security\OAuth1\OAuthUtil;
+
+class OAuthRequest
+{
+	private $parameters;
+	private $http_method;
+	private $http_url;
+	// for debug purposes
+	public $base_string;
+	public static $version = '1.0';
+	public static $POST_INPUT = 'php://input';
+
+	function __construct($http_method, $http_url, $parameters = null)
+	{
+		@$parameters or $parameters = [];
+		$parameters        = array_merge(OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
+		$this->parameters  = $parameters;
+		$this->http_method = $http_method;
+		$this->http_url    = $http_url;
+	}
+
+
+	/**
+	 * attempt to build up a request from what was passed to the server
+	 *
+	 * @param string|null $http_method
+	 * @param string|null $http_url
+	 * @param string|null $parameters
+	 *
+	 * @return OAuthRequest
+	 */
+	public static function from_request($http_method = null, $http_url = null, $parameters = null)
+	{
+		$scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
+			? 'http'
+			: 'https';
+		@$http_url or $http_url = $scheme .
+								  '://' . $_SERVER['HTTP_HOST'] .
+								  ':' .
+								  $_SERVER['SERVER_PORT'] .
+								  $_SERVER['REQUEST_URI'];
+		@$http_method or $http_method = $_SERVER['REQUEST_METHOD'];
+
+		// We weren't handed any parameters, so let's find the ones relevant to
+		// this request.
+		// If you run XML-RPC or similar you should use this to provide your own
+		// parsed parameter-list
+		if (!$parameters) {
+			// Find request headers
+			$request_headers = OAuthUtil::get_headers();
+
+			// Parse the query-string to find GET parameters
+			$parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);
+
+			// It's a POST request of the proper content-type, so parse POST
+			// parameters and add those overriding any duplicates from GET
+			if (
+				$http_method == "POST"
+				&& @strstr(
+					$request_headers["Content-Type"],
+					"application/x-www-form-urlencoded"
+				)
+			) {
+				$post_data  = OAuthUtil::parse_parameters(
+					file_get_contents(self::$POST_INPUT)
+				);
+				$parameters = array_merge($parameters, $post_data);
+			}
+
+			// We have a Authorization-header with OAuth data. Parse the header
+			// and add those overriding any duplicates from GET or POST
+			if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
+				$header_parameters = OAuthUtil::split_header(
+					$request_headers['Authorization']
+				);
+				$parameters        = array_merge($parameters, $header_parameters);
+			}
+		}
+		// fix for friendica redirect system
+
+		$http_url = substr($http_url, 0, strpos($http_url, $parameters['pagename']) + strlen($parameters['pagename']));
+		unset($parameters['pagename']);
+
+		return new OAuthRequest($http_method, $http_url, $parameters);
+	}
+
+	/**
+	 * pretty much a helper function to set up the request
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthConsumer $consumer
+	 * @param \Friendica\Security\OAuth1\OAuthToken    $token
+	 * @param string                                   $http_method
+	 * @param string                                   $http_url
+	 * @param array|null                               $parameters
+	 *
+	 * @return OAuthRequest
+	 */
+	public static function from_consumer_and_token(\Friendica\Security\OAuth1\OAuthConsumer $consumer, $http_method, $http_url, array $parameters = null, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		@$parameters or $parameters = [];
+		$defaults = [
+			"oauth_version"      => OAuthRequest::$version,
+			"oauth_nonce"        => OAuthRequest::generate_nonce(),
+			"oauth_timestamp"    => OAuthRequest::generate_timestamp(),
+			"oauth_consumer_key" => $consumer->key,
+		];
+		if ($token)
+			$defaults['oauth_token'] = $token->key;
+
+		$parameters = array_merge($defaults, $parameters);
+
+		return new OAuthRequest($http_method, $http_url, $parameters);
+	}
+
+	public function set_parameter($name, $value, $allow_duplicates = true)
+	{
+		if ($allow_duplicates && isset($this->parameters[$name])) {
+			// We have already added parameter(s) with this name, so add to the list
+			if (is_scalar($this->parameters[$name])) {
+				// This is the first duplicate, so transform scalar (string)
+				// into an array so we can add the duplicates
+				$this->parameters[$name] = [$this->parameters[$name]];
+			}
+
+			$this->parameters[$name][] = $value;
+		} else {
+			$this->parameters[$name] = $value;
+		}
+	}
+
+	public function get_parameter($name)
+	{
+		return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
+	}
+
+	public function get_parameters()
+	{
+		return $this->parameters;
+	}
+
+	public function unset_parameter($name)
+	{
+		unset($this->parameters[$name]);
+	}
+
+	/**
+	 * The request parameters, sorted and concatenated into a normalized string.
+	 *
+	 * @return string
+	 */
+	public function get_signable_parameters()
+	{
+		// Grab all parameters
+		$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 = [
+			$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);
+
+		$port   = @$parts['port'];
+		$scheme = $parts['scheme'];
+		$host   = $parts['host'];
+		$path   = @$parts['path'];
+
+		$port or $port = ($scheme == 'https') ? '443' : '80';
+
+		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
+	 *
+	 * @param bool $raw
+	 *
+	 * @return array|string
+	 */
+	public function to_postdata(bool $raw = false)
+	{
+		if ($raw)
+			return $this->parameters;
+		else
+			return OAuthUtil::build_http_query($this->parameters);
+	}
+
+	/**
+	 * builds the Authorization: header
+	 *
+	 * @param string|null $realm
+	 *
+	 * @return string
+	 * @throws \Friendica\Security\OAuth1\OAuthException
+	 */
+	public function to_header($realm = null)
+	{
+		$first = true;
+		if ($realm) {
+			$out   = 'Authorization: OAuth realm="' . OAuthUtil::urlencode_rfc3986($realm) . '"';
+			$first = false;
+		} else
+			$out = 'Authorization: OAuth';
+
+		foreach ($this->parameters as $k => $v) {
+			if (substr($k, 0, 5) != "oauth") continue;
+			if (is_array($v)) {
+				throw new \Friendica\Security\OAuth1\OAuthException('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(\Friendica\Security\OAuth1\OAuthSignatureMethod $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(\Friendica\Security\OAuth1\OAuthSignatureMethod $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()
+	{
+		return Friendica\Util\Strings::getRandomHex(32);
+	}
+}

src/Security/OAuth1/OAuthServer.php

@@ -0,0 +1,293 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica\Security\FKOAuthDataStore;
+use OAuthConsumer;
+use OAuthRequest;
+use OAuthSignatureMethod;
+use OAuthToken;
+
+class OAuthServer
+{
+	protected $timestamp_threshold = 300; // in seconds, five minutes
+	protected $version = '1.0';             // hi blaine
+	/** @var \Friendica\Security\OAuth1\OAuthSignatureMethod[] */
+	protected $signature_methods = [];
+
+	/** @var FKOAuthDataStore */
+	protected $data_store;
+
+	function __construct(FKOAuthDataStore $data_store)
+	{
+		$this->data_store = $data_store;
+	}
+
+	public function add_signature_method(\Friendica\Security\OAuth1\OAuthSignatureMethod $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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 *
+	 * @return \Friendica\Security\OAuth1\OAuthToken|null
+	 * @throws OAuthException
+	 */
+	public function fetch_request_token(\Friendica\Security\OAuth1\OAuthRequest $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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 *
+	 * @return object
+	 * @throws OAuthException
+	 */
+	public function fetch_access_token(\Friendica\Security\OAuth1\OAuthRequest $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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 *
+	 * @return array
+	 * @throws OAuthException
+	 */
+	public function verify_request(\Friendica\Security\OAuth1\OAuthRequest $request)
+	{
+		$this->get_version($request);
+		$consumer = $this->get_consumer($request);
+		$token    = $this->get_token($request, $consumer, "access");
+		$this->check_signature($request, $consumer, $token);
+		return [$consumer, $token];
+	}
+
+	// Internals from here
+
+	/**
+	 * version 1
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 *
+	 * @return string
+	 * @throws OAuthException
+	 */
+	private function get_version(\Friendica\Security\OAuth1\OAuthRequest $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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 *
+	 * @return \Friendica\Security\OAuth1\OAuthSignatureMethod
+	 * @throws OAuthException
+	 */
+	private function get_signature_method(\Friendica\Security\OAuth1\OAuthRequest $request)
+	{
+		$signature_method =
+			@$request->get_parameter("oauth_signature_method");
+
+		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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 *
+	 * @return \Friendica\Security\OAuth1\OAuthConsumer
+	 * @throws OAuthException
+	 */
+	private function get_consumer(\Friendica\Security\OAuth1\OAuthRequest $request)
+	{
+		$consumer_key = @$request->get_parameter("oauth_consumer_key");
+		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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest $request
+	 * @param                                         $consumer
+	 * @param string                                  $token_type
+	 *
+	 * @return \Friendica\Security\OAuth1\OAuthToken|null
+	 * @throws OAuthException
+	 */
+	private function get_token(\Friendica\Security\OAuth1\OAuthRequest &$request, $consumer, $token_type = "access")
+	{
+		$token_field = @$request->get_parameter('oauth_token');
+		$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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthRequest    $request
+	 * @param \Friendica\Security\OAuth1\OAuthConsumer   $consumer
+	 * @param \Friendica\Security\OAuth1\OAuthToken|null $token
+	 *
+	 * @throws OAuthException
+	 */
+	private function check_signature(\Friendica\Security\OAuth1\OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		// this should probably be in a different method
+		$timestamp = @$request->get_parameter('oauth_timestamp');
+		$nonce     = @$request->get_parameter('oauth_nonce');
+
+		$this->check_timestamp($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,
+			$signature,
+			$token
+		);
+
+		if (!$valid_sig) {
+			throw new OAuthException("Invalid signature");
+		}
+	}
+
+	/**
+	 * check that the timestamp is new enough
+	 *
+	 * @param int $timestamp
+	 *
+	 * @throws OAuthException
+	 */
+	private function check_timestamp($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
+	 *
+	 * @param \Friendica\Security\OAuth1\OAuthConsumer $consumer
+	 * @param \Friendica\Security\OAuth1\OAuthToken    $token
+	 * @param string                                   $nonce
+	 * @param int                                      $timestamp
+	 *
+	 * @throws OAuthException
+	 */
+	private function check_nonce(\Friendica\Security\OAuth1\OAuthConsumer $consumer, \Friendica\Security\OAuth1\OAuthToken $token, $nonce, int $timestamp)
+	{
+		if (!$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");
+		}
+	}
+}

src/Security/OAuth1/OAuthSignatureMethod.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica\Security\OAuth1\OAuthRequest;
+
+/**
+ * A class for implementing a Signature Method
+ * See section 9 ("Signing Requests") in the spec
+ */
+abstract class OAuthSignatureMethod
+{
+	/**
+	 * Needs to return the name of the Signature Method (ie HMAC-SHA1)
+	 *
+	 * @return string
+	 */
+	abstract public function get_name();
+
+	/**
+	 * Build up the signature
+	 * NOTE: The output of this function MUST NOT be urlencoded.
+	 * the encoding is handled in OAuthRequest when the final
+	 * request is serialized
+	 *
+	 * @param OAuthRequest                             $request
+	 * @param \Friendica\Security\OAuth1\OAuthConsumer $consumer
+	 * @param \Friendica\Security\OAuth1\OAuthToken    $token
+	 *
+	 * @return string
+	 */
+	abstract public function build_signature(OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, \Friendica\Security\OAuth1\OAuthToken $token = null);
+
+	/**
+	 * Verifies that a given signature is correct
+	 *
+	 * @param OAuthRequest                             $request
+	 * @param \Friendica\Security\OAuth1\OAuthConsumer $consumer
+	 * @param \Friendica\Security\OAuth1\OAuthToken    $token
+	 * @param string                                   $signature
+	 *
+	 * @return bool
+	 */
+	public function check_signature(OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, $signature, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		$built = $this->build_signature($request, $consumer, $token);
+		return ($built == $signature);
+	}
+}

src/Security/OAuth1/OAuthSignatureMethod_HMAC_SHA1.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica\Security\OAuth1\OAuthRequest;
+use Friendica\Security\OAuth1\OAuthUtil;
+
+/**
+ * The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
+ * where the Signature Base String is the text and the key is the concatenated values (each first
+ * encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
+ * character (ASCII code 38) even if empty.
+ *   - Chapter 9.2 ("HMAC-SHA1")
+ */
+class OAuthSignatureMethod_HMAC_SHA1 extends \Friendica\Security\OAuth1\OAuthSignatureMethod
+{
+	function get_name()
+	{
+		return "HMAC-SHA1";
+	}
+
+	/**
+	 * @param OAuthRequest                             $request
+	 * @param \Friendica\Security\OAuth1\OAuthConsumer $consumer
+	 * @param \Friendica\Security\OAuth1\OAuthToken    $token
+	 *
+	 * @return string
+	 */
+	public function build_signature(OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		$base_string          = $request->get_signature_base_string();
+		$request->base_string = $base_string;
+
+		$key_parts = [
+			$consumer->secret,
+			($token) ? $token->secret : "",
+		];
+
+		$key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
+		$key       = implode('&', $key_parts);
+
+
+		$r = base64_encode(hash_hmac('sha1', $base_string, $key, true));
+		return $r;
+	}
+}

src/Security/OAuth1/OAuthSignatureMethod_PLAINTEXT.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica\Security\OAuth1\OAuthRequest;
+use Friendica\Security\OAuth1\OAuthUtil;
+
+/**
+ * The PLAINTEXT method does not provide any security protection and SHOULD only be used
+ * over a secure channel such as HTTPS. It does not use the Signature Base String.
+ *   - Chapter 9.4 ("PLAINTEXT")
+ */
+class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod
+{
+	public function get_name()
+	{
+		return "PLAINTEXT";
+	}
+
+	/**
+	 * oauth_signature is set to the concatenated encoded values of the Consumer Secret and
+	 * Token Secret, separated by a '&' character (ASCII code 38), even if either secret is
+	 * empty. The result MUST be encoded again.
+	 *   - Chapter 9.4.1 ("Generating Signatures")
+	 *
+	 * Please note that the second encoding MUST NOT happen in the SignatureMethod, as
+	 * OAuthRequest handles this!
+	 *
+	 * @param $request
+	 * @param $consumer
+	 * @param $token
+	 *
+	 * @return string
+	 */
+	public function build_signature(OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		$key_parts = [
+			$consumer->secret,
+			($token) ? $token->secret : "",
+		];
+
+		$key_parts            = OAuthUtil::urlencode_rfc3986($key_parts);
+		$key                  = implode('&', $key_parts);
+		$request->base_string = $key;
+
+		return $key;
+	}
+}

src/Security/OAuth1/OAuthSignatureMethod_RSA_SHA1.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica\Security\OAuth1\OAuthRequest;
+
+/**
+ * The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in
+ * [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for
+ * EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a
+ * verified way to the Service Provider, in a manner which is beyond the scope of this
+ * specification.
+ *   - Chapter 9.3 ("RSA-SHA1")
+ */
+abstract class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod
+{
+	public function get_name()
+	{
+		return "RSA-SHA1";
+	}
+
+	// Up to the SP to implement this lookup of keys. Possible ideas are:
+	// (1) do a lookup in a table of trusted certs keyed off of consumer
+	// (2) fetch via http using a url provided by the requester
+	// (3) some sort of specific discovery code based on request
+	//
+	// Either way should return a string representation of the certificate
+	protected abstract function fetch_public_cert(&$request);
+
+	// Up to the SP to implement this lookup of keys. Possible ideas are:
+	// (1) do a lookup in a table of trusted certs keyed off of consumer
+	//
+	// Either way should return a string representation of the certificate
+	protected abstract function fetch_private_cert(&$request);
+
+	public function build_signature(OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		$base_string          = $request->get_signature_base_string();
+		$request->base_string = $base_string;
+
+		// Fetch the private key cert based on the request
+		$cert = $this->fetch_private_cert($request);
+
+		// Pull the private key ID from the certificate
+		$privatekeyid = openssl_get_privatekey($cert);
+
+		// Sign using the key
+		openssl_sign($base_string, $signature, $privatekeyid);
+
+		// Release the key resource
+		openssl_free_key($privatekeyid);
+
+		return base64_encode($signature);
+	}
+
+	public function check_signature(OAuthRequest $request, \Friendica\Security\OAuth1\OAuthConsumer $consumer, $signature, \Friendica\Security\OAuth1\OAuthToken $token = null)
+	{
+		$decoded_sig = base64_decode($signature);
+
+		$base_string = $request->get_signature_base_string();
+
+		// Fetch the public key cert based on the request
+		$cert = $this->fetch_public_cert($request);
+
+		// Pull the public key ID from the certificate
+		$publickeyid = openssl_get_publickey($cert);
+
+		// Check the computed signature against the one passed in the query
+		$ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
+
+		// Release the key resource
+		openssl_free_key($publickeyid);
+
+		return $ok == 1;
+	}
+}

src/Security/OAuth1/OAuthToken.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+use Friendica\Security\OAuth1\OAuthUtil;
+
+class OAuthToken
+{
+	// access tokens and request tokens
+	public $key;
+	public $secret;
+
+	public $expires;
+	public $scope;
+	public $uid;
+
+	/**
+	 * key = the token
+	 * secret = the token secret
+	 *
+	 * @param $key
+	 * @param $secret
+	 */
+	function __construct($key, $secret)
+	{
+		$this->key    = $key;
+		$this->secret = $secret;
+	}
+
+	/**
+	 * generates the basic string serialization of a token that a server
+	 * would respond to request_token and access_token calls with
+	 */
+	function to_string()
+	{
+		return "oauth_token=" .
+			   OAuthUtil::urlencode_rfc3986($this->key) .
+			   "&oauth_token_secret=" .
+			   OAuthUtil::urlencode_rfc3986($this->secret);
+	}
+
+	function __toString()
+	{
+		return $this->to_string();
+	}
+}

src/Security/OAuth1/OAuthUtil.php

@@ -0,0 +1,166 @@
+<?php
+
+namespace Friendica\Security\OAuth1;
+
+class OAuthUtil
+{
+	public static function urlencode_rfc3986($input)
+	{
+		if (is_array($input)) {
+			return array_map(['Friendica\Security\OAuth1\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($string);
+	}
+
+	// Utility function for turning the Authorization: header into
+	// parameters, has to do some unescaping
+	// Can filter out any non-oauth parameters if needed (default behaviour)
+	public static function split_header($header, $only_allow_oauth_parameters = true)
+	{
+		$pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
+		$offset  = 0;
+		$params  = [];
+		while (preg_match($pattern, $header, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
+			$match          = $matches[0];
+			$header_name    = $matches[2][0];
+			$header_content = (isset($matches[5])) ? $matches[5][0] : $matches[4][0];
+			if (preg_match('/^oauth_/', $header_name) || !$only_allow_oauth_parameters) {
+				$params[$header_name] = OAuthUtil::urldecode_rfc3986($header_content);
+			}
+			$offset = $match[1] + strlen($match[0]);
+		}
+
+		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
+			$out = [];
+			foreach ($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
+			$out = [];
+			if (isset($_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 [];
+
+		$pairs = explode('&', $input);
+
+		$parsed_parameters = [];
+		foreach ($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] = [$parsed_parameters[$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');
+
+		$pairs = [];
+		foreach ($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)
+				natsort($value);
+				foreach ($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);
+	}
+}

src/Security/OAuth1/README.md

@@ -0,0 +1 @@
+This namespace contains the OAuth1 library for server and client usages