Build Ooyala Query URL

build_query_url.php

/**
 * Build Query URL
 **/
function build_query_url( $params, $request_type ) {
	
	// Add an expire time of 15 minutes unless otherwise specified
	if ( is_array( $params ) AND !array_key_exists( 'expires', $params ) )
  		$params['expires'] = time() + 900;
	
	
	$string_to_sign = OOYALA_SECRET_CODE;
	$url = "http://api.ooyala.com/partner/$request_type?pcode=" . OOYALA_PARTNER_CODE;
	
	// set Delete values
	if ( is_array( $params['delete'] ) )
		$params['delete'] = implode( '\0', $params['delete'] );
	
	
	$keys = array_keys( $params );
	sort( $keys );
	
	foreach ( $keys as $key ) {
		$string_to_sign .= $key . '=' . $params[$key];
		$url .= '&' . rawurlencode( $key ) . '=' . rawurlencode( $params[$key] );
	}
	
	$digest = hash( 'sha256', $string_to_sign, true );
	$signature = ereg_replace( '=+$', '', trim( base64_encode( $digest ) ) );
	$url .= '&signature=' . rawurlencode( $signature );
	
	
	$this->url = $url;
	
	return $url;
	
} // end function build_query_url