874 lines
26 KiB
PHP
874 lines
26 KiB
PHP
<?php
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// vim: foldmethod=marker
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/* Generic exception class
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*/
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class OAuthException extends Exception {
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// pass
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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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return $built == $signature;
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}
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}
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/**
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* The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
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* where the Signature Base String is the text and the key is the concatenated values (each first
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* encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
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* character (ASCII code 38) even if empty.
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* - Chapter 9.2 ("HMAC-SHA1")
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*/
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class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
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function get_name() {
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return "HMAC-SHA1";
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}
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public function build_signature($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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private $parameters;
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private $http_method;
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private $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 or $parameters = array();
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$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 or $http_url = $scheme .
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'://' . $_SERVER['HTTP_HOST'] .
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':' .
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$_SERVER['SERVER_PORT'] .
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$_SERVER['REQUEST_URI'];
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@$http_method or $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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&& @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, $post_data);
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}
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// We have a Authorization-header with OAuth data. Parse the header
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// and add those overriding any duplicates from GET or POST
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if (@substr($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 or $parameters = array();
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$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 = $this->parameters;
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// Remove oauth_signature if present
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// Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
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if (isset($params['oauth_signature'])) {
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unset($params['oauth_signature']);
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}
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return OAuthUtil::build_http_query($params);
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}
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/**
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* Returns the base string of this request
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*
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* The base string defined as the method, the url
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* and the parameters (normalized), each urlencoded
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* and the concated with &.
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*/
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public function get_signature_base_string() {
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$parts = array(
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$this->get_normalized_http_method(),
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$this->get_normalized_http_url(),
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$this->get_signable_parameters()
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);
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$parts = OAuthUtil::urlencode_rfc3986($parts);
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return implode('&', $parts);
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}
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/**
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* just uppercases the http method
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*/
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public function get_normalized_http_method() {
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return strtoupper($this->http_method);
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}
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/**
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* parses the url and rebuilds it to be
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* scheme://host/path
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*/
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public function get_normalized_http_url() {
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$parts = parse_url($this->http_url);
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$port = @$parts['port'];
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$scheme = $parts['scheme'];
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$host = $parts['host'];
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$path = @$parts['path'];
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$port or $port = ($scheme == 'https') ? '443' : '80';
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if (($scheme == 'https' && $port != '443')
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|| ($scheme == 'http' && $port != '80')) {
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$host = "$host:$port";
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}
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return "$scheme://$host$path";
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}
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/**
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* builds a url usable for a GET request
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*/
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public function to_url() {
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$post_data = $this->to_postdata();
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$out = $this->get_normalized_http_url();
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if ($post_data) {
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$out .= '?'.$post_data;
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}
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return $out;
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}
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/**
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* builds the data one would send in a POST request
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*/
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public function to_postdata() {
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return OAuthUtil::build_http_query($this->parameters);
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}
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/**
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* builds the Authorization: header
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*/
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public function to_header($realm=null) {
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$first = true;
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if($realm) {
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$out = 'Authorization: OAuth realm="' . OAuthUtil::urlencode_rfc3986($realm) . '"';
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$first = false;
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} else
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$out = 'Authorization: OAuth';
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$total = array();
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foreach ($this->parameters as $k => $v) {
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if (substr($k, 0, 5) != "oauth") continue;
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if (is_array($v)) {
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throw new OAuthException('Arrays not supported in headers');
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}
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$out .= ($first) ? ' ' : ',';
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$out .= OAuthUtil::urlencode_rfc3986($k) .
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'="' .
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OAuthUtil::urlencode_rfc3986($v) .
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'"';
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$first = false;
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}
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return $out;
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}
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public function __toString() {
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return $this->to_url();
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}
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public function sign_request($signature_method, $consumer, $token) {
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$this->set_parameter(
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"oauth_signature_method",
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$signature_method->get_name(),
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false
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);
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$signature = $this->build_signature($signature_method, $consumer, $token);
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$this->set_parameter("oauth_signature", $signature, false);
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}
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public function build_signature($signature_method, $consumer, $token) {
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$signature = $signature_method->build_signature($this, $consumer, $token);
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return $signature;
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}
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/**
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* util function: current timestamp
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*/
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private static function generate_timestamp() {
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return time();
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}
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/**
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* util function: current nonce
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*/
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private static function generate_nonce() {
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$mt = microtime();
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$rand = mt_rand();
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return md5($mt . $rand); // md5s look nicer than numbers
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}
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}
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class OAuthServer {
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protected $timestamp_threshold = 300; // in seconds, five minutes
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protected $version = '1.0'; // hi blaine
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protected $signature_methods = array();
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protected $data_store;
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function __construct($data_store) {
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$this->data_store = $data_store;
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}
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public function add_signature_method($signature_method) {
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$this->signature_methods[$signature_method->get_name()] =
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$signature_method;
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}
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// high level functions
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/**
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* process a request_token request
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* returns the request token on success
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*/
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public function fetch_request_token(&$request) {
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$this->get_version($request);
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$consumer = $this->get_consumer($request);
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// no token required for the initial token request
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$token = NULL;
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$this->check_signature($request, $consumer, $token);
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// Rev A change
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$callback = $request->get_parameter('oauth_callback');
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$new_token = $this->data_store->new_request_token($consumer, $callback);
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return $new_token;
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}
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/**
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* process an access_token request
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* returns the access token on success
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*/
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public function fetch_access_token(&$request) {
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$this->get_version($request);
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$consumer = $this->get_consumer($request);
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// requires authorized request token
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$token = $this->get_token($request, $consumer, "request");
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$this->check_signature($request, $consumer, $token);
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// Rev A change
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$verifier = $request->get_parameter('oauth_verifier');
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$new_token = $this->data_store->new_access_token($token, $consumer, $verifier);
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return $new_token;
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}
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/**
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* verify an api call, checks all the parameters
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*/
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public function verify_request(&$request) {
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$this->get_version($request);
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$consumer = $this->get_consumer($request);
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$token = $this->get_token($request, $consumer, "access");
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$this->check_signature($request, $consumer, $token);
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return array($consumer, $token);
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}
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// Internals from here
|
|
/**
|
|
* version 1
|
|
*/
|
|
private function get_version(&$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");
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|
}
|
|
return $version;
|
|
}
|
|
|
|
/**
|
|
* figure out the signature with some defaults
|
|
*/
|
|
private function get_signature_method(&$request) {
|
|
$signature_method =
|
|
@$request->get_parameter("oauth_signature_method");
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|
|
|
if (!$signature_method) {
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// According to chapter 7 ("Accessing Protected Ressources") the signature-method
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|
// parameter is required, and we can't just fallback to PLAINTEXT
|
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throw new OAuthException('No signature method parameter. This parameter is required');
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|
}
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|
|
|
if (!in_array($signature_method,
|
|
array_keys($this->signature_methods))) {
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|
throw new OAuthException(
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|
"Signature method '$signature_method' not supported " .
|
|
"try one of the following: " .
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|
implode(", ", array_keys($this->signature_methods))
|
|
);
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|
}
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|
return $this->signature_methods[$signature_method];
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|
}
|
|
|
|
/**
|
|
* try to find the consumer for the provided request's consumer key
|
|
*/
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|
private function get_consumer(&$request) {
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|
$consumer_key = @$request->get_parameter("oauth_consumer_key");
|
|
if (!$consumer_key) {
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|
throw new OAuthException("Invalid consumer key");
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|
}
|
|
|
|
$consumer = $this->data_store->lookup_consumer($consumer_key);
|
|
if (!$consumer) {
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|
throw new OAuthException("Invalid consumer");
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|
}
|
|
|
|
return $consumer;
|
|
}
|
|
|
|
/**
|
|
* try to find the token for the provided request's token key
|
|
*/
|
|
private function get_token(&$request, $consumer, $token_type="access") {
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|
$token_field = @$request->get_parameter('oauth_token');
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|
$token = $this->data_store->lookup_token(
|
|
$consumer, $token_type, $token_field
|
|
);
|
|
if (!$token) {
|
|
throw new OAuthException("Invalid $token_type token: $token_field");
|
|
}
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|
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->get_parameter('oauth_timestamp');
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$nonce = @$request->get_parameter('oauth_nonce');
|
|
|
|
$this->check_timestamp($timestamp);
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$this->check_nonce($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 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: $nonce");
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
class OAuthDataStore {
|
|
function lookup_consumer($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($string);
|
|
}
|
|
|
|
// Utility function for turning the Authorization: header into
|
|
// parameters, has to do some unescaping
|
|
// Can filter out any non-oauth parameters if needed (default behaviour)
|
|
public static function split_header($header, $only_allow_oauth_parameters = true) {
|
|
$pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
|
|
$offset = 0;
|
|
$params = array();
|
|
while (preg_match($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 = 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)
|
|
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);
|
|
}
|
|
}
|
|
|
|
?>
|