Source for file _xmlrpc_wrappers.inc.php
Documentation is available at _xmlrpc_wrappers.inc.php
* PHP-XMLRPC "wrapper" functions
* Generate stubs to transparently access xmlrpc methods as php functions and viceversa
* @version $Id: _xmlrpc_wrappers.inc.php,v 1.1 2008/01/14 07:17:32 fplanque Exp $
* @copyright G. Giunta (C) 2006
* @todo separate introspection from code generation for func-2-method wrapping
* @todo use some better templating system from code generation?
* @todo implement method wrapping with preservation of php objs in calls
* @todo when wrapping methods without obj rebuilding, use return_type = 'phpvals' (faster)
* @todo implement self-parsing of php code for PHP <= 4
* Given a string defining a php type or phpxmlrpc type (loosely defined: strings
* accepted come from javadoc blocks), return corresponding phpxmlrpc type.
* NB: for php 'resource' types returns empty string, since resources cannot be serialized;
* for php class names returns 'struct', since php objects can be serialized as xmlrpc structs
return $GLOBALS['xmlrpcString'];
case $GLOBALS['xmlrpcInt']:
// 'int'
case $GLOBALS['xmlrpcI4']:
return $GLOBALS['xmlrpcInt'];
return $GLOBALS['xmlrpcDouble'];
return $GLOBALS['xmlrpcBoolean'];
return $GLOBALS['xmlrpcArray'];
return $GLOBALS['xmlrpcStruct'];
case $GLOBALS['xmlrpcBase64']:
case $GLOBALS['xmlrpcStruct']:
return $GLOBALS['xmlrpcStruct'];
// unknown: might be any 'extended' xmlrpc type
return $GLOBALS['xmlrpcValue'];
* Given a string defining a phpxmlrpc type return corresponding php type.
* @param string $xmlrpctype
return $GLOBALS['xmlrpcString'];
// unknown: might be any xmlrpc type
* Given a user-defined PHP function, create a PHP 'wrapper' function that can
* be exposed as xmlrpc method from an xmlrpc_server object and called from remote
* clients (as well as its corresponding signature info).
* Since php is a typeless language, to infer types of input and output parameters,
* it relies on parsing the javadoc-style comment block associated with the given
* function. Usage of xmlrpc native types (such as datetime.dateTime.iso8601 and base64)
* in the @param tag is also allowed, if you need the php function to receive/send
* data in that particular format (note that base64 encoding/decoding is transparently
* carried out by the lib, while datetime vals are passed around as strings)
* - only works for user-defined functions, not for PHP internal functions
* (reflection does not support retrieving number/type of params for those)
* - functions returning php objects will generate special xmlrpc responses:
* when the xmlrpc decoding of those responses is carried out by this same lib, using
* the appropriate param in php_xmlrpc_decode, the php objects will be rebuilt.
* In short: php objects can be serialized, too (except for their resource members),
* Other libs might choke on the very same xml that will be generated in this case
* (i.e. it has a nonstandard attribute on struct element tags)
* - usage of javadoc @param tags using param names in a different order from the
* function prototype is not considered valid (to be fixed?)
* Note that since rel. 2.0RC3 the preferred method to have the server call 'standard'
* php functions (ie. functions not expecting a single xmlrpcmsg obj as parameter)
* is by making use of the functions_parameters_type class member.
* @param string $funcname the name of the PHP user function to be exposed as xmlrpc method; array($obj, 'methodname') might be ok too, in the future...
* @param string $newfuncname (optional) name for function to be created
* @param array $extra_options (optional) array of options for conversion. valid values include:
* bool return_source when true, php code w. function definition will be returned, not evaluated
* bool encode_php_objs let php objects be sent to server using the 'improved' xmlrpc notation, so server can deserialize them as php objects
* bool decode_php_objs --- WARNING !!! possible security hazard. only use it with trusted servers ---
* bool suppress_warnings remove from produced xml any runtime warnings due to the php function being invoked
* @return false on error, or an array containing the name of the new php function,
* its signature and docs, to be used in the server dispatch map
* @todo decide how to deal with params passed by ref: bomb out or allow?
* @todo finish using javadoc info to build method sig if all params are named but out of order
* @todo add a check for params of 'resource' type
* @todo add some trigger_errors / error_log when returning false?
* @todo what to do when the PHP function returns NULL? we are currently an empty string value...
* @todo add an option to suppress php warnings in invocation of user function, similar to server debug level 3?
$buildit = isset
($extra_options['return_source']) ?
!($extra_options['return_source']) :
true;
$prefix = isset
($extra_options['prefix']) ?
$extra_options['prefix'] :
'xmlrpc';
$encode_php_objects = isset
($extra_options['encode_php_objs']) ? (bool)
$extra_options['encode_php_objs'] :
false;
$decode_php_objects = isset
($extra_options['decode_php_objs']) ? (bool)
$extra_options['decode_php_objs'] :
false;
$catch_warnings = isset
($extra_options['suppress_warnings']) &&
$extra_options['suppress_warnings'] ?
'@' :
'';
// up to php 5.0.3 some useful reflection methods were missing
error_log('XML-RPC: cannot not wrap php functions unless running php version bigger than 5.0.3');
error_log('XML-RPC: function to be wrapped is not defined: '.
$funcname);
// determine name of new php function
$xmlrpcfuncname =
"{
$prefix}_".
implode('_', $funcname);
$xmlrpcfuncname =
"{
$prefix}_$funcname";
$xmlrpcfuncname =
$newfuncname;
// start to introspect PHP code
$func =
& new ReflectionFunction($funcname);
// Note: from PHP 5.1.0 onward, we will possibly be able to use invokeargs
// instead of getparameters to fully reflect internal php functions ?
error_log('XML-RPC: function to be wrapped is internal: '.
$funcname);
// retrieve parameter names, types and description from javadoc comments
// type of return val: by default 'any'
$returns =
$GLOBALS['xmlrpcValue'];
// type + name of function parameters
$docs =
$func->getDocComment();
$doc =
trim($doc, " \r\t/*");
elseif(strpos($doc, '@param') ===
0)
// syntax: @param type [$name] desc
if(preg_match('/@param\s+(\S+)(\s+\$\S+)?\s+(.+)/', $doc, $matches))
//$paramDocs[$i]['type'] = explode('|', $matches[1]);
$paramDocs[$i]['type'] =
'mixed';
$paramDocs[$i]['type'] =
$matches[1];
$paramDocs[$i]['name'] =
trim($matches[2]);
$paramDocs[$i]['doc'] =
$matches[3];
elseif(strpos($doc, '@return') ===
0)
// syntax: @return type desc
//$returns = preg_split('/\s+/', $doc);
if(preg_match('/@return\s+(\S+)\s+(.+)/', $doc, $matches))
$returnsDocs =
$matches[2];
// execute introspection of actual function prototype
foreach($func->getParameters() as $paramobj)
$params[$i]['name'] =
'$'.
$paramobj->getName();
$params[$i]['isoptional'] =
$paramobj->isOptional();
// start building of PHP code to be eval'd
$parsvariations =
array();
foreach($params as $param)
if (isset
($paramDocs[$i]['name']) &&
$paramDocs[$i]['name'] &&
strtolower($paramDocs[$i]['name']) !=
strtolower($param['name']))
// param name from phpdoc info does not match param definition!
$paramDocs[$i]['type'] =
'mixed';
// this particular parameter is optional. save as valid previous list of parameters
$innercode .=
"if (\$paramcount > $i) {\n";
$parsvariations[] =
$pars;
$innercode .=
"\$p$i = \$msg->getParam($i);\n";
$innercode .=
"if (\$p{$i}->kindOf() == 'scalar') \$p$i = \$p{$i}->scalarval(); else \$p$i = php_{$prefix}_decode(\$p$i, array('decode_php_objs'));\n";
$innercode .=
"if (\$p{$i}->kindOf() == 'scalar') \$p$i = \$p{$i}->scalarval(); else \$p$i = php_{$prefix}_decode(\$p$i);\n";
// last allowed parameters combination
$parsvariations[] =
$pars;
if(count($parsvariations) ==
0)
// only known good synopsis = no parameters
$parsvariations[] =
array();
$minpars =
count($parsvariations[0]);
// add to code the check for min params number
// NB: this check needs to be done BEFORE decoding param values
$innercode =
"\$paramcount = \$msg->getNumParams();\n" .
"if (\$paramcount < $minpars) return new {$prefix}resp(0, {$GLOBALS['xmlrpcerr']['incorrect_params']}, '{$GLOBALS['xmlrpcstr']['incorrect_params']}');\n" .
$innercode;
$innercode =
"\$paramcount = \$msg->getNumParams();\n" .
$innercode;
$innercode .=
"\$np = false;\n";
foreach($parsvariations as $pars)
$innercode .=
"if (\$paramcount == " .
count($pars) .
") \$retval = {$catch_warnings}$funcname(" .
implode(',', $pars) .
"); else\n";
// build a 'generic' signature (only use an appropriate return type)
$psig =
array($returnsDocs);
for($i=
0; $i <
count($pars); $i++
)
if (isset
($paramDocs[$i]['type']))
$sig[] =
$GLOBALS['xmlrpcValue'];
$psig[] = isset
($paramDocs[$i]['doc']) ?
$paramDocs[$i]['doc'] :
'';
$innercode .=
"\$np = true;\n";
$innercode .=
"if (\$np) return new {$prefix}resp(0, {$GLOBALS['xmlrpcerr']['incorrect_params']}, '{$GLOBALS['xmlrpcstr']['incorrect_params']}'); else {\n";
//$innercode .= "if (\$_xmlrpcs_error_occurred) return new xmlrpcresp(0, $GLOBALS['xmlrpcerr']user, \$_xmlrpcs_error_occurred); else\n";
$innercode .=
"if (is_a(\$retval, '{$prefix}resp')) return \$retval; else\n";
if($returns ==
$GLOBALS['xmlrpcDateTime'] ||
$returns ==
$GLOBALS['xmlrpcBase64'])
$innercode .=
"return new {$prefix}resp(new {$prefix}val(\$retval, '$returns'));";
$innercode .=
"return new {$prefix}resp(php_{$prefix}_encode(\$retval, array('encode_php_objs')));\n";
$innercode .=
"return new {$prefix}resp(php_{$prefix}_encode(\$retval));\n";
// shall we exclude functions returning by ref?
// if($func->returnsReference())
$code =
"function $xmlrpcfuncname(\$msg) {\n" .
$innercode .
"}\n}";
//$xmlrpcfuncname = create_function('$m', $innercode);
error_log('XML-RPC: could not create function '.
$xmlrpcfuncname.
' to wrap php function '.
$funcname);
/// @todo examine if $paramDocs matches $parsvariations and build array for
/// usage as method signature, plus put together a nice string for docs
$ret =
array('function' =>
$xmlrpcfuncname, 'signature' =>
$sigs, 'docstring' =>
$desc, 'signature_docs' =>
$psigs, 'source' =>
$code);
* Given an xmlrpc client and a method name, register a php wrapper function
* that will call it and return results using native php types for both
* params and results. The generated php function will return an xmlrpcresp
* oject for failed xmlrpc calls
* - server must support system.methodsignature for the wanted xmlrpc method
* - for methods that expose many signatures, only one can be picked (we
* could in priciple check if signatures differ only by number of params
* and not by type, but it would be more complication than we can spare time)
* - nested xmlrpc params: the caller of the generated php function has to
* encode on its own the params passed to the php function if these are structs
* or arrays whose (sub)members include values of type datetime or base64
* Notes: the connection properties of the given client will be copied
* and reused for the connection used during the call to the generated
* Calling the generated php function 'might' be slow: a new xmlrpc client
* is created on every invocation and an xmlrpc-connection opened+closed.
* An extra 'debug' param is appended to param list of xmlrpc method, useful
* for debugging purposes.
* @param xmlrpc_client $client an xmlrpc client set up correctly to communicate with target server
* @param string $methodname the xmlrpc method to be mapped to a php function
* @param array $extra_options array of options that specify conversion details. valid ptions include
* integer signum the index of the method signature to use in mapping (if method exposes many sigs)
* integer timeout timeout (in secs) to be used when executing function/calling remote method
* string protocol 'http' (default), 'http11' or 'https'
* string new_function_name the name of php function to create. If unsepcified, lib will pick an appropriate name
* string return_source if true return php code w. function definition instead fo function name
* bool encode_php_objs let php objects be sent to server using the 'improved' xmlrpc notation, so server can deserialize them as php objects
* bool decode_php_objs --- WARNING !!! possible security hazard. only use it with trusted servers ---
* mixed return_on_fault a php value to be returned when the xmlrpc call fails/returns a fault response (by default the xmlrpcresp object is returned in this case). If a string is used, '%faultCode%' and '%faultString%' tokens will be substituted with actual error values
* bool debug set it to 1 or 2 to see debug results of querying server for method synopsis
* @return string the name of the generated php function (or false) - OR AN ARRAY...
function wrap_xmlrpc_method($client, $methodname, $extra_options=
0, $timeout=
0, $protocol=
'', $newfuncname=
'')
// mind numbing: let caller use sane calling convention (as per javadoc, 3 params),
// OR the 2.0 calling convention (no ptions) - we really love backward compat, don't we?
$signum =
$extra_options;
$extra_options =
array();
$signum = isset
($extra_options['signum']) ? (int)
$extra_options['signum'] :
0;
$timeout = isset
($extra_options['timeout']) ? (int)
$extra_options['timeout'] :
0;
$protocol = isset
($extra_options['protocol']) ?
$extra_options['protocol'] :
'';
$newfuncname = isset
($extra_options['new_function_name']) ?
$extra_options['new_function_name'] :
'';
//$encode_php_objects = in_array('encode_php_objects', $extra_options);
//$verbatim_client_copy = in_array('simple_client_copy', $extra_options) ? 1 :
// in_array('build_class_code', $extra_options) ? 2 : 0;
$encode_php_objects = isset
($extra_options['encode_php_objs']) ? (bool)
$extra_options['encode_php_objs'] :
false;
$decode_php_objects = isset
($extra_options['decode_php_objs']) ? (bool)
$extra_options['decode_php_objs'] :
false;
$simple_client_copy = isset
($extra_options['simple_client_copy']) ? (int)
($extra_options['simple_client_copy']) :
0;
$buildit = isset
($extra_options['return_source']) ?
!($extra_options['return_source']) :
true;
$prefix = isset
($extra_options['prefix']) ?
$extra_options['prefix'] :
'xmlrpc';
if (isset
($extra_options['return_on_fault']))
$fault_response =
$extra_options['return_on_fault'];
$debug = isset
($extra_options['debug']) ?
($extra_options['debug']) :
0;
$msgclass =
$prefix.
'msg';
$valclass =
$prefix.
'val';
$decodefunc =
'php_'.
$prefix.
'_decode';
$msg =
& new $msgclass('system.methodSignature');
$msg->addparam(new $valclass($methodname));
$client->setDebug($debug);
$response =
& $client->send($msg, $timeout, $protocol);
if($response->faultCode())
error_log('XML-RPC: could not retrieve method signature from remote server for method '.
$methodname);
$msig =
$response->value();
if ($client->return_type !=
'phpvals')
$msig =
$decodefunc($msig);
error_log('XML-RPC: could not retrieve method signature nr.'.
$signum.
' from remote server for method '.
$methodname);
// pick a suitable name for the new function, avoiding collisions
$xmlrpcfuncname =
$newfuncname;
// take care to insure that methodname is translated to valid
$xmlrpcfuncname =
$prefix.
'_'.
preg_replace(array('/\./', '/[^a-zA-Z0-9_\x7f-\xff]/'),
array('_', ''), $methodname);
// if in 'offline' mode, get method description too.
// in online mode, favour speed of operation
$msg =
& new $msgclass('system.methodHelp');
$msg->addparam(new $valclass($methodname));
$response =
& $client->send($msg, $timeout, $protocol);
if (!$response->faultCode())
$mdesc =
$response->value();
if ($client->return_type !=
'phpvals')
$mdesc =
$mdesc->scalarval();
$results =
build_remote_method_wrapper_code($client, $methodname,
$xmlrpcfuncname, $msig, $mdesc, $timeout, $protocol, $simple_client_copy,
$prefix, $decode_php_objects, $encode_php_objects, $decode_fault,
eval
($results['source'].
'$allOK=1;');
//$xmlrpcfuncname = create_function('$m', $innercode);
error_log('XML-RPC: could not create function '.
$xmlrpcfuncname.
' to wrap remote method '.
$methodname);
$results['function'] =
$xmlrpcfuncname;
* Similar to wrap_xmlrpc_method, but will generate a php class that wraps
* all xmlrpc methods exposed by the remote server as own methods.
* For more details see wrap_xmlrpc_method.
* @param xmlrpc_client $client the client obj all set to query the desired server
* @param array $extra_options list of options for wrapped code
* @return mixed false on error, the name of the created class if all ok or an array with code, class name and comments (if the appropriatevoption is set in extra_options)
$methodfilter = isset
($extra_options['method_filter']) ?
$extra_options['method_filter'] :
'';
$signum = isset
($extra_options['signum']) ? (int)
$extra_options['signum'] :
0;
$timeout = isset
($extra_options['timeout']) ? (int)
$extra_options['timeout'] :
0;
$protocol = isset
($extra_options['protocol']) ?
$extra_options['protocol'] :
'';
$newclassname = isset
($extra_options['new_class_name']) ?
$extra_options['new_class_name'] :
'';
$encode_php_objects = isset
($extra_options['encode_php_objs']) ? (bool)
$extra_options['encode_php_objs'] :
false;
$decode_php_objects = isset
($extra_options['decode_php_objs']) ? (bool)
$extra_options['decode_php_objs'] :
false;
$verbatim_client_copy = isset
($extra_options['simple_client_copy']) ?
!($extra_options['simple_client_copy']) :
true;
$buildit = isset
($extra_options['return_source']) ?
!($extra_options['return_source']) :
true;
$prefix = isset
($extra_options['prefix']) ?
$extra_options['prefix'] :
'xmlrpc';
$msgclass =
$prefix.
'msg';
//$valclass = $prefix.'val';
$decodefunc =
'php_'.
$prefix.
'_decode';
$msg =
& new $msgclass('system.listMethods');
$response =
& $client->send($msg, $timeout, $protocol);
if($response->faultCode())
error_log('XML-RPC: could not retrieve method list from remote server');
$mlist =
$response->value();
if ($client->return_type !=
'phpvals')
$mlist =
$decodefunc($mlist);
error_log('XML-RPC: could not retrieve meaningful method list from remote server');
// pick a suitable name for the new function, avoiding collisions
$xmlrpcclassname =
$newclassname;
$xmlrpcclassname =
$prefix.
'_'.
preg_replace(array('/\./', '/[^a-zA-Z0-9_\x7f-\xff]/'),
array('_', ''), $client->server).
'_client';
/// @todo add function setdebug() to new class, to enable/disable debugging
$source =
"class $xmlrpcclassname\n{\nvar \$client;\n\n";
$source .=
"function $xmlrpcclassname()\n{\n";
$source .=
build_client_wrapper_code($client, $verbatim_client_copy, $prefix);
$source .=
"\$this->client =& \$client;\n}\n\n";
$opts =
array('simple_client_copy' =>
2, 'return_source' =>
true,
'timeout' =>
$timeout, 'protocol' =>
$protocol,
'encode_php_objs' =>
$encode_php_objects, 'prefix' =>
$prefix,
'decode_php_objs' =>
$decode_php_objects
/// @todo build javadoc for class definition, too
foreach($mlist as $mname)
if ($methodfilter ==
'' ||
preg_match($methodfilter, $mname))
$opts['new_function_name'] =
preg_replace(array('/\./', '/[^a-zA-Z0-9_\x7f-\xff]/'),
$source .=
$methodwrap['docstring'];
$source .=
$methodwrap['source'].
"\n";
error_log('XML-RPC: will not create class method to wrap remote method '.
$mname);
eval
($source.
'$allOK=1;');
//$xmlrpcfuncname = create_function('$m', $innercode);
error_log('XML-RPC: could not create class '.
$xmlrpcclassname.
' to wrap remote server '.
$client->server);
return array('class' =>
$xmlrpcclassname, 'code' =>
$source, 'docstring' =>
'');
* Given the necessary info, build php code that creates a new function to
* invoke a remote xmlrpc method.
* Take care that no full checking of input parameters is done to ensure that
* valid php code is emitted.
* Note: real spaghetti code follows...
function build_remote_method_wrapper_code($client, $methodname, $xmlrpcfuncname,
$msig, $mdesc=
'', $timeout=
0, $protocol=
'', $client_copy_mode=
0, $prefix=
'xmlrpc',
$decode_php_objects=
false, $encode_php_objects=
false, $decode_fault=
false,
$code =
"function $xmlrpcfuncname (";
if ($client_copy_mode <
2)
// client copy mode 0 or 1 == partial / full client copy in emitted code
$innercode =
build_client_wrapper_code($client, $client_copy_mode, $prefix);
$innercode .=
"\$client->setDebug(\$debug);\n";
// client copy mode 2 == no client copy in emitted code
$innercode .=
"\$msg =& new {$prefix}msg('$methodname');\n";
// take care that PHP comment is not terminated unwillingly by method description
$mdesc =
"/**\n* ".
str_replace('*/', '* /', $mdesc).
"\n";
$mdesc =
"/**\nFunction $xmlrpcfuncname\n";
for($i =
1; $i <
$pcount; $i++
)
if($ptype ==
'i4' ||
$ptype ==
'int' ||
$ptype ==
'boolean' ||
$ptype ==
'double' ||
$ptype ==
'string' ||
$ptype ==
'dateTime.iso8601' ||
$ptype ==
'base64' ||
$ptype ==
'null')
// only build directly xmlrpcvals when type is known and scalar
$innercode .=
"\$p$i =& new {$prefix}val(\$p$i, '$ptype');\n";
$innercode .=
"\$p$i =& php_{$prefix}_encode(\$p$i, array('encode_php_objs'));\n";
$innercode .=
"\$p$i =& php_{$prefix}_encode(\$p$i);\n";
$innercode .=
"\$msg->addparam(\$p$i);\n";
if ($client_copy_mode <
2)
$mdesc .=
"* @param int \$debug when 1 (or 2) will enable debugging of the underlying {$prefix} call (defaults to 0)\n";
$mdesc .=
'* @return '.
xmlrpc_2_php_type($msig[0]).
" (or an {$prefix}resp obj instance if call fails)\n*/\n";
$innercode .=
"\$res =& \${$this_}client->send(\$msg, $timeout, '$protocol');\n";
if (is_string($fault_response) &&
((strpos($fault_response, '%faultCode%') !==
false) ||
(strpos($fault_response, '%faultString%') !==
false)))
$respcode =
"str_replace(array('%faultCode%', '%faultString%'), array(\$res->faultCode(), \$res->faultString()), '".
str_replace("'", "''", $fault_response).
"')";
$innercode .=
"if (\$res->faultcode()) return $respcode; else return php_{$prefix}_decode(\$res->value(), array('decode_php_objs'));";
$innercode .=
"if (\$res->faultcode()) return $respcode; else return php_{$prefix}_decode(\$res->value());";
$code =
$code .
$plist.
") {\n" .
$innercode .
"\n}\n";
return array('source' =>
$code, 'docstring' =>
$mdesc);
* Given necessary info, generate php code that will rebuild a client object
* Take care that no full checking of input parameters is done to ensure that
* valid php code is emitted.
function build_client_wrapper_code($client, $verbatim_client_copy, $prefix=
'xmlrpc')
$code =
"\$client =& new {$prefix}_client('".
str_replace("'", "\'", $client->path).
"', '" .
str_replace("'", "\'", $client->server) .
"', $client->port);\n";
// copy all client fields to the client that will be generated runtime
// (this provides for future expansion or subclassing of client obj)
if ($verbatim_client_copy)
foreach($client as $fld =>
$val)
if($fld !=
'debug' &&
$fld !=
'return_type')
$code .=
"\$client->$fld = $val;\n";
// only make sure that client always returns the correct data type
$code .=
"\$client->return_type = '{$prefix}vals';\n";
//$code .= "\$client->setDebug(\$debug);\n";