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-rw-r--r--include/ws_core.inc.php611
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diff --git a/include/ws_core.inc.php b/include/ws_core.inc.php
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+<?php
+// +-----------------------------------------------------------------------+
+// | PhpWebGallery - a PHP based picture gallery |
+// | Copyright (C) 2003-2007 PhpWebGallery Team - http://phpwebgallery.net |
+// +-----------------------------------------------------------------------+
+// | branch : BSF (Best So Far)
+// | file : $URL: svn+ssh://rvelices@svn.gna.org/svn/phpwebgallery/trunk/action.php $
+// | last update : $Date: 2006-12-21 18:49:12 -0500 (Thu, 21 Dec 2006) $
+// | last modifier : $Author: rvelices $
+// | revision : $Rev: 1678 $
+// +-----------------------------------------------------------------------+
+// | This program is free software; you can redistribute it and/or modify |
+// | it under the terms of the GNU General Public License as published by |
+// | the Free Software Foundation |
+// | |
+// | This program is distributed in the hope that it will be useful, but |
+// | WITHOUT ANY WARRANTY; without even the implied warranty of |
+// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
+// | General Public License for more details. |
+// | |
+// | You should have received a copy of the GNU General Public License |
+// | along with this program; if not, write to the Free Software |
+// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA. |
+// +-----------------------------------------------------------------------+
+
+/**** WEB SERVICE CORE CLASSES************************************************
+ * PwgServer - main object - the link between web service methods, request
+ * handler and response encoder
+ * PwgRequestHandler - base class for handlers
+ * PwgResponseEncoder - base class for response encoders
+ * PwgError, PwgNamedArray, PwgNamedStruct - can be used by web service functions
+ * as return values
+ */
+
+
+define( 'WS_PARAM_ACCEPT_ARRAY', 0x010000 );
+define( 'WS_PARAM_FORCE_ARRAY', 0x030000 );
+define( 'WS_PARAM_OPTIONAL', 0x040000 );
+
+define( 'WS_ERR_INVALID_METHOD', 1001 );
+define( 'WS_ERR_MISSING_PARAM', 1002 );
+define( 'WS_ERR_INVALID_PARAM', 1003 );
+
+define( 'WS_XML_ATTRIBUTES', 'attributes_xml_');
+define( 'WS_XML_CONTENT', 'content_xml_');
+
+/**
+ * PwgError object can be returned from any web service function implementation.
+ */
+class PwgError
+{
+ var $_code;
+ var $_codeText;
+
+ function PwgError($code, $codeText)
+ {
+ $this->_code = $code;
+ $this->_codeText = $codeText;
+ }
+
+ function code() { return $this->_code; }
+ function message() { return $this->_codeText; }
+}
+
+/**
+ * Simple wrapper around an array (keys are consecutive integers starting at 0).
+ * Provides naming clues for xml output (xml attributes vs. xml child elements?)
+ * Usually returned by web service function implementation.
+ */
+class PwgNamedArray
+{
+ /*private*/ var $_content;
+ /*private*/ var $_itemName;
+ /*private*/ var $_xmlAttributes;
+
+ /**
+ * Constructs a named array
+ * @param arr array (keys must be consecutive integers starting at 0)
+ * @param itemName string xml element name for values of arr (e.g. image)
+ * @param xmlAttributes array of sub-item attributes that will be encoded as
+ * xml attributes instead of xml child elements
+ */
+ function PwgNamedArray(&$arr, $itemName, $xmlAttributes=array() )
+ {
+ $this->_content = $arr;
+ $this->_itemName = $itemName;
+ $this->_xmlAttributes = array_flip($xmlAttributes);
+ }
+}
+/**
+ * Simple wrapper around a "struct" (php array whose keys are not consecutive
+ * integers starting at 0). Provides naming clues for xml output (what is xml
+ * attributes and what is element)
+ */
+class PwgNamedStruct
+{
+ /*private*/ var $_content;
+ /*private*/ var $_name;
+ /*private*/ var $_xmlAttributes;
+
+ /**
+ * Constructs a named struct (usually returned by web service function
+ * implementation)
+ * @param name string - containing xml element name
+ * @param content array - the actual content (php array)
+ * @param xmlAttributes array - name of the keys in $content that will be
+ * encoded as xml attributes (if null - automatically prefer xml attributes
+ * whenever possible)
+ */
+ function PwgNamedStruct($name, $content, $xmlAttributes=null, $xmlElements=null )
+ {
+ $this->_name = $name;
+ $this->_content = $content;
+ if ( isset($xmlAttributes) )
+ {
+ $this->_xmlAttributes = array_flip($xmlAttributes);
+ }
+ else
+ {
+ $this->_xmlAttributes = array();
+ foreach ($this->_content as $key=>$value)
+ {
+ if (!empty($key) and (is_scalar($value) or is_null($value)) )
+ {
+ if ( empty($xmlElements) or !in_array($key,$xmlElements) )
+ {
+ $this->_xmlAttributes[$key]=1;
+ }
+ }
+ }
+ }
+ }
+}
+
+
+/**
+ * Replace array_walk_recursive()
+ *
+ * @category PHP
+ * @package PHP_Compat
+ * @link http://php.net/function.array_walk_recursive
+ * @author Tom Buskens <ortega@php.net>
+ * @author Aidan Lister <aidan@php.net>
+ * @version $Revision: 1.7 $
+ * @since PHP 5
+ * @require PHP 4.0.6 (is_callable)
+ */
+if (!function_exists('array_walk_recursive')) {
+ function array_walk_recursive(&$input, $funcname)
+ {
+ if (!is_callable($funcname)) {
+ if (is_array($funcname)) {
+ $funcname = $funcname[0] . '::' . $funcname[1];
+ }
+ user_error('array_walk_recursive() Not a valid callback ' . $user_func,
+ E_USER_WARNING);
+ return;
+ }
+
+ if (!is_array($input)) {
+ user_error('array_walk_recursive() The argument should be an array',
+ E_USER_WARNING);
+ return;
+ }
+
+ $args = func_get_args();
+
+ foreach ($input as $key => $item) {
+ if (is_array($item)) {
+ array_walk_recursive($item, $funcname, $args);
+ $input[$key] = $item;
+ } else {
+ $args[0] = &$item;
+ $args[1] = &$key;
+ call_user_func_array($funcname, $args);
+ $input[$key] = $item;
+ }
+ }
+ }
+}
+
+/**
+ * Abstract base class for request handlers.
+ */
+class PwgRequestHandler
+{
+ /** Virtual abstract method. Decodes the request (GET or POST) handles the
+ * method invocation as well as response sending.
+ */
+ function handleRequest(&$server) { assert(false); }
+}
+
+/**
+ *
+ * Base class for web service response encoder.
+ */
+class PwgResponseEncoder
+{
+ /** encodes the web service response to the appropriate output format
+ * @param response mixed the unencoded result of a service method call
+ */
+ function encodeResponse($response) { assert(false); }
+
+ /** default "Content-Type" http header for this kind of response format
+ */
+ function getContentType() { assert(false); }
+
+ /**
+ * returns true if the parameter is a 'struct' (php array type whose keys are
+ * NOT consecutive integers starting with 0)
+ */
+ function is_struct(&$data)
+ {
+ if (is_array($data) )
+ {
+ if (range(0, count($data) - 1) !== array_keys($data) )
+ { # string keys, unordered, non-incremental keys, .. - whatever, make object
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * removes all XML formatting from $response (named array, named structs, etc)
+ * usually called by every response encoder, except rest xml.
+ */
+ function flattenResponse(&$response)
+ {
+ PwgResponseEncoder::_mergeAttributesAndContent($response);
+ PwgResponseEncoder::_removeNamedArray($response);
+ PwgResponseEncoder::_removeNamedStruct($response);
+ if (is_array($response))
+ { // need to call 2 times (first time might add new arrays)
+ array_walk_recursive($response, array('PwgResponseEncoder', '_remove_named_callback') );
+ array_walk_recursive($response, array('PwgResponseEncoder', '_remove_named_callback') );
+ }
+//print_r($response);
+ PwgResponseEncoder::_mergeAttributesAndContent($response);
+ }
+
+ /*private*/ function _remove_named_callback(&$value, $key)
+ {
+ do
+ {
+ $changed = 0;
+ $changed += PwgResponseEncoder::_removeNamedArray($value);
+ $changed += PwgResponseEncoder::_removeNamedStruct($value);
+ // print_r('walk '.$key."<br/>\n");
+ }
+ while ($changed);
+ }
+
+ /*private*/ function _mergeAttributesAndContent(&$value)
+ {
+ if ( !is_array($value) )
+ return;
+/* $first_key = '';
+ if (count($value)) { $ak = array_keys($value); $first_key = $ak[0]; }
+
+ print_r( '_mergeAttributesAndContent is_struct='.PwgResponseEncoder::is_struct($value)
+ .' count='.count($value)
+ .' first_key='.$first_key
+ ."<br/>\n"
+ );*/
+ $ret = 0;
+ if (PwgResponseEncoder::is_struct($value))
+ {
+ if ( isset($value[WS_XML_ATTRIBUTES]) )
+ {
+ $value = array_merge( $value, $value[WS_XML_ATTRIBUTES] );
+ unset( $value[WS_XML_ATTRIBUTES] );
+ $ret=1;
+ }
+ if ( isset($value[WS_XML_CONTENT]) )
+ {
+ $cont_processed = 0;
+ if ( count($value)==1 )
+ {
+ $value = $value[WS_XML_CONTENT];
+ $cont_processed=1;
+ }
+ else
+ {
+ if (PwgResponseEncoder::is_struct($value[WS_XML_CONTENT]))
+ {
+ $value = array_merge( $value, $value[WS_XML_CONTENT] );
+ unset( $value[WS_XML_CONTENT] );
+ $cont_processed=1;
+ }
+ }
+ $ret += $cont_processed;
+ if (!$cont_processed)
+ {
+ $value['_content'] = $value[WS_XML_CONTENT];
+ unset( $value[WS_XML_CONTENT] );
+ $ret++;
+ }
+ }
+ }
+
+ foreach ($value as $key=>$v)
+ {
+ if ( PwgResponseEncoder::_mergeAttributesAndContent($v) )
+ {
+ $value[$key]=$v;
+ $ret++;
+ }
+ }
+ return $ret;
+ }
+
+ /*private*/ function _removeNamedArray(&$value)
+ {
+ if ( strtolower( get_class($value) ) =='pwgnamedarray')
+ {
+ $value = $value->_content;
+ return 1;
+ }
+ return 0;
+ }
+
+ /*private*/ function _removeNamedStruct(&$value)
+ {
+ if ( strtolower( get_class($value) ) =='pwgnamedstruct')
+ {
+ if ( isset($value->_content['']) )
+ {
+ $unknown = $value->_content[''];
+ unset( $value->_content[''] );
+ $value->_content[$value->_name] = $unknown;
+ }
+ $value = $value->_content;
+ return 1;
+ }
+ return 0;
+ }
+}
+
+
+
+class PwgServer
+{
+ var $_requestHandler;
+ var $_requestFormat;
+ var $_responseEncoder;
+ var $_responseFormat;
+
+ var $_methods;
+ var $_methodSignatures;
+
+ function PwgServer()
+ {
+ $methods = array();
+ }
+
+ /**
+ * Initializes the request handler.
+ */
+ function setHandler($requestFormat, &$requestHandler)
+ {
+ $this->_requestHandler = &$requestHandler;
+ $this->_requestFormat = $requestFormat;
+ }
+
+ /**
+ * Initializes the request handler.
+ */
+ function setEncoder($responseFormat, &$encoder)
+ {
+ $this->_responseEncoder = &$encoder;
+ $this->_responseFormat = $responseFormat;
+ }
+
+ /**
+ * Runs the web service call (handler and response encoder should have been
+ * created)
+ */
+ function run()
+ {
+ if ( is_null($this->_responseEncoder) )
+ {
+ @header("HTTP/1.1 500 Server error");
+ @header("Status: 500 Server error");
+ @header("Content-Type: text/plain");
+ echo ("Cannot process your request. Unknown response format.
+Request format: ".@$this->_requestFormat." handler:".$this->_requestHandler."
+Response format: ".@$this->_responseFormat." encoder:".$this->_responseEncoder."
+ ");
+ var_export($this);
+ die(0);
+ }
+
+ if ( is_null($this->_requestHandler) )
+ {
+ $this->sendResponse(
+ new PwgError(500, 'Unknown request format')
+ );
+ return;
+ }
+
+ $this->addMethod('reflection.getMethodList',
+ array('PwgServer', 'ws_getMethodList'),
+ null, '' );
+ $this->addMethod('reflection.getMethodDetails',
+ array('PwgServer', 'ws_getMethodDetails'),
+ array('methodName'),'');
+
+ trigger_action('ws_add_methods', array(&$this) );
+ uksort( $this->_methods, 'strnatcmp' );
+ $this->_requestHandler->handleRequest($this);
+ }
+
+ /**
+ * Encodes a response and sends it back to the browser.
+ */
+ function sendResponse($response)
+ {
+ $encodedResponse = $this->_responseEncoder->encodeResponse($response);
+ $contentType = $this->_responseEncoder->getContentType();
+
+ @header('Content-Type: '.$contentType);
+ print_r($encodedResponse);
+ }
+
+ /**
+ * Registers a web service method.
+ * @param methodName string - the name of the method as seen externally
+ * @param callback mixed - php method to be invoked internally
+ * @param params array - map of allowed parameter names with optional default
+ * values and parameter flags. Example of $params:
+ * array( 'param1' => array('default'=>523, 'flags'=>WS_PARAM_FORCE_ARRAY) ) .
+ * Possible parameter flags are:
+ * WS_PARAM_ALLOW_ARRAY - this parameter can be an array
+ * WS_PARAM_FORCE_ARRAY - if this parameter is scalar, force it to an array
+ * before invoking the method
+ * @param description string - a description of the method.
+ */
+ function addMethod($methodName, $callback, $params=array(), $description, $include_file='')
+ {
+ $this->_methods[$methodName] = $callback;
+ $this->_methodDescriptions[$methodName] = $description;
+
+ if (!is_array($params))
+ {
+ $params = array();
+ }
+
+ if ( range(0, count($params) - 1) === array_keys($params) )
+ {
+ $params = array_flip($params);
+ }
+
+ foreach( $params as $param=>$options)
+ {
+ if ( !is_array($options) )
+ {
+ $params[$param] = array('flags'=>0);
+ }
+ else
+ {
+ $flags = isset($options['flags']) ? $options['flags'] : 0;
+ if ( array_key_exists('default', $options) )
+ {
+ $flags |= WS_PARAM_OPTIONAL;
+ }
+ $options['flags'] = $flags;
+ $params[$param] = $options;
+ }
+ }
+ $this->_methodSignatures[$methodName] = $params;
+ }
+
+ function hasMethod($methodName)
+ {
+ return isset($this->_methods[$methodName]);
+ }
+
+ function getMethodDescription($methodName)
+ {
+ $desc = @$this->_methodDescriptions[$methodName];
+ return isset($desc) ? $desc : '';
+ }
+
+ function getMethodSignature($methodName)
+ {
+ $signature = @$this->_methodSignatures[$methodName];
+ return isset($signature) ? $signature : array();
+ }
+
+ /*static*/ function isPost()
+ {
+ return isset($HTTP_RAW_POST_DATA) or !empty($_POST);
+ }
+
+ /*static*/ function makeArrayParam(&$param)
+ {
+ if ( $param==null )
+ {
+ $param = array();
+ }
+ else
+ {
+ if (! is_array($param) )
+ {
+ $param = array($param);
+ }
+ }
+ }
+
+ /**
+ * Invokes a registered method. Returns the return of the method (or
+ * a PwgError object if the method is not found)
+ * @param methodName string the name of the method to invoke
+ * @param params array array of parameters to pass to the invoked method
+ */
+ function invoke($methodName, $params)
+ {
+ $callback = @$this->_methods[$methodName];
+
+ if ( $callback==null )
+ {
+ return new PwgError(WS_ERR_INVALID_METHOD, 'Method name "'.$methodName.'" is not valid');
+ }
+
+ // parameter check and data coercion !
+ $signature = @$this->_methodSignatures[$methodName];
+ $missing_params = array();
+ foreach($signature as $name=>$options)
+ {
+ $flags = $options['flags'];
+ if ( !array_key_exists($name, $params) )
+ {// parameter not provided in the request
+ if ( !($flags&WS_PARAM_OPTIONAL) )
+ {
+ $missing_params[] = $name;
+ }
+ else if ( array_key_exists('default',$options) )
+ {
+ $params[$name] = $options['default'];
+ if ( ($flags&WS_PARAM_FORCE_ARRAY) )
+ {
+ $this->makeArrayParam( $params[$name] );
+ }
+ }
+ }
+ else
+ {// parameter provided - do some basic checks
+ $the_param = $params[$name];
+ if ( is_array($the_param) and ($flags&WS_PARAM_ACCEPT_ARRAY)==0 )
+ {
+ return new PwgError(WS_ERR_INVALID_PARAM, $name.' must be scalar' );
+ }
+ if ( ($flags&WS_PARAM_FORCE_ARRAY) )
+ {
+ $this->makeArrayParam( $the_param );
+ }
+ $params[$name] = $the_param;
+ }
+ }
+ if (count($missing_params))
+ {
+ return new PwgError(WS_ERR_MISSING_PARAM, 'Missing parameters: '.implode(',',$missing_params));
+ }
+
+ $result = call_user_func_array($callback, array($params, &$this) );
+ return $result;
+ }
+
+ /**
+ * WS reflection method implementation: lists all available methods
+ */
+ /*static*/ function ws_getMethodList($params, &$service)
+ {
+ return array('methods' => new PwgNamedArray( array_keys($service->_methods),'method' ) );
+ }
+
+ /**
+ * WS reflection method implementation: gets information about a given method
+ */
+ /*static*/ function ws_getMethodDetails($params, &$service)
+ {
+ $methodName = $params['methodName'];
+ if (!$service->hasMethod($methodName))
+ {
+ return new PwgError(WS_ERR_INVALID_PARAM,
+ 'Requested method does not exist');
+ }
+ $res = array(
+ 'name' => $methodName,
+ 'description' => $service->getMethodDescription($methodName),
+ 'params' => array(),
+ );
+ $signature = $service->getMethodSignature($methodName);
+ foreach ($signature as $name => $options)
+ {
+ $param_data = array(
+ 'name' => $name,
+ 'optional' => ($options['flags']&WS_PARAM_OPTIONAL)?true:false,
+ );
+ if (isset($options['default']))
+ {
+ $param_data['defaultValue'] = $options['default'];
+ }
+ $res['params'][] = $param_data;
+ }
+ return $res;
+ }
+}
+?>