aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/web/phpxmlrpclib/xmlrpc_wrappers.inc
blob: cb0c6e8acd115f696594522737fb36d5ad7b12e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
<?php
/**
 * PHP-XMLRPC "wrapper" functions
 * Generate stubs to transparently access xmlrpc methods as php functions and viceversa
 *
 * @version $Id: xmlrpc_wrappers.inc,v 1.13 2008/09/20 01:23:47 ggiunta Exp $
 * @author Gaetano Giunta
 * @copyright (C) 2006-2008 G. Giunta
 * @license code licensed under the BSD License: http://phpxmlrpc.sourceforge.net/license.txt
 *
 * @todo separate introspection from code generation for func-2-method wrapping
 * @todo use some better templating system for 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
 */

	// requires: xmlrpc.inc

	/**
	* 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
	* @param string $phptype
	* @return string
	*/
	function php_2_xmlrpc_type($phptype)
	{
		switch(strtolower($phptype))
		{
			case 'string':
				return $GLOBALS['xmlrpcString'];
			case 'integer':
			case $GLOBALS['xmlrpcInt']: // 'int'
			case $GLOBALS['xmlrpcI4']:
				return $GLOBALS['xmlrpcInt'];
			case 'double':
				return $GLOBALS['xmlrpcDouble'];
			case 'boolean':
				return $GLOBALS['xmlrpcBoolean'];
			case 'array':
				return $GLOBALS['xmlrpcArray'];
			case 'object':
				return $GLOBALS['xmlrpcStruct'];
			case $GLOBALS['xmlrpcBase64']:
			case $GLOBALS['xmlrpcStruct']:
				return strtolower($phptype);
			case 'resource':
				return '';
			default:
				if(class_exists($phptype))
				{
					return $GLOBALS['xmlrpcStruct'];
				}
				else
				{
					// unknown: might be any 'extended' xmlrpc type
					return $GLOBALS['xmlrpcValue'];
				}
		}
	}

	/**
	* Given a string defining a phpxmlrpc type return corresponding php type.
	* @param string $xmlrpctype
	* @return string
	*/
	function xmlrpc_2_php_type($xmlrpctype)
	{
		switch(strtolower($xmlrpctype))
		{
			case 'base64':
			case 'datetime.iso8601':
			case 'string':
				return $GLOBALS['xmlrpcString'];
			case 'int':
			case 'i4':
				return 'integer';
			case 'struct':
			case 'array':
				return 'array';
			case 'double':
				return 'float';
			case 'undefined':
				return 'mixed';
			case 'boolean':
			case 'null':
			default:
				// unknown: might be any xmlrpc type
				return strtolower($xmlrpctype);
		}
	}

	/**
	* 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)
	*
	* Known limitations:
	* - requires PHP 5.0.3 +
	* - 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),
	*   using this function.
	*   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') and array('class', 'methodname') are ok too
	* @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 returning an empty string value...
	* @todo add an option to suppress php warnings in invocation of user function, similar to server debug level 3?
	* @todo if $newfuncname is empty, we could use create_user_func instead of eval, as it is possibly faster
	* @todo add a verbatim_object_copy parameter to allow avoiding the same obj instance?
	*/
	function wrap_php_function($funcname, $newfuncname='', $extra_options=array())
	{
		$buildit = isset($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'] ? '@' : '';

		if(version_compare(phpversion(), '5.0.3') == -1)
		{
			// 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');
			return false;
		}

        $exists = false;
        if(is_array($funcname))
        {
            if(count($funcname) < 2 || (!is_string($funcname[0]) && !is_object($funcname[0])))
            {
    			error_log('XML-RPC: syntax for function to be wrapped is wrong');
    			return false;
            }
            if(is_string($funcname[0]))
            {
                $plainfuncname = implode('::', $funcname);
            }
            elseif(is_object($funcname[0]))
            {
                $plainfuncname = get_class($funcname[0]) . '->' . $funcname[1];
            }
            $exists = method_exists($funcname[0], $funcname[1]);
        }
        else
        {
            $plainfuncname = $funcname;
            $exists = function_exists($funcname);
        }

		if(!$exists)
		{
			error_log('XML-RPC: function to be wrapped is not defined: '.$plainfuncname);
			return false;
		}
		else
		{
			// determine name of new php function
			if($newfuncname == '')
			{
				if(is_array($funcname))
				{
    				if(is_string($funcname[0]))
        				$xmlrpcfuncname = "{$prefix}_".implode('_', $funcname);
    				else
    					$xmlrpcfuncname = "{$prefix}_".get_class($funcname[0]) . '_' . $funcname[1];
				}
				else
				{
					$xmlrpcfuncname = "{$prefix}_$funcname";
				}
			}
			else
			{
				$xmlrpcfuncname = $newfuncname;
			}
			while($buildit && function_exists($xmlrpcfuncname))
			{
				$xmlrpcfuncname .= 'x';
			}

			// start to introspect PHP code
			if(is_array($funcname))
			{
    			$func =& new ReflectionMethod($funcname[0], $funcname[1]);
    			if($func->isPrivate())
    			{
    				error_log('XML-RPC: method to be wrapped is private: '.$plainfuncname);
    				return false;
    			}
    			if($func->isProtected())
    			{
    				error_log('XML-RPC: method to be wrapped is protected: '.$plainfuncname);
    				return false;
    			}
     			if($func->isConstructor())
    			{
    				error_log('XML-RPC: method to be wrapped is the constructor: '.$plainfuncname);
    				return false;
    			}
    			if($func->isDestructor())
    			{
    				error_log('XML-RPC: method to be wrapped is the destructor: '.$plainfuncname);
    				return false;
    			}
    			if($func->isAbstract())
    			{
    				error_log('XML-RPC: method to be wrapped is abstract: '.$plainfuncname);
    				return false;
    			}
                /// @todo add more checks for static vs. nonstatic?
            }
			else
			{
    			$func =& new ReflectionFunction($funcname);
            }
			if($func->isInternal())
			{
				// Note: from PHP 5.1.0 onward, we will possibly be able to use invokeargs
				// instead of getparameters to fully reflect internal php functions ?
				error_log('XML-RPC: function to be wrapped is internal: '.$plainfuncname);
				return false;
			}

			// retrieve parameter names, types and description from javadoc comments

			// function description
			$desc = '';
			// type of return val: by default 'any'
			$returns = $GLOBALS['xmlrpcValue'];
			// desc of return val
			$returnsDocs = '';
			// type + name of function parameters
			$paramDocs = array();

			$docs = $func->getDocComment();
			if($docs != '')
			{
				$docs = explode("\n", $docs);
				$i = 0;
				foreach($docs as $doc)
				{
					$doc = trim($doc, " \r\t/*");
					if(strlen($doc) && strpos($doc, '@') !== 0 && !$i)
					{
						if($desc)
						{
							$desc .= "\n";
						}
						$desc .= $doc;
					}
					elseif(strpos($doc, '@param') === 0)
					{
						// syntax: @param type [$name] desc
						if(preg_match('/@param\s+(\S+)(\s+\$\S+)?\s+(.+)/', $doc, $matches))
						{
							if(strpos($matches[1], '|'))
							{
								//$paramDocs[$i]['type'] = explode('|', $matches[1]);
								$paramDocs[$i]['type'] = 'mixed';
							}
							else
							{
								$paramDocs[$i]['type'] = $matches[1];
							}
							$paramDocs[$i]['name'] = trim($matches[2]);
							$paramDocs[$i]['doc'] = $matches[3];
						}
						$i++;
					}
					elseif(strpos($doc, '@return') === 0)
					{
						// syntax: @return type desc
						//$returns = preg_split('/\s+/', $doc);
						if(preg_match('/@return\s+(\S+)\s+(.+)/', $doc, $matches))
						{
							$returns = php_2_xmlrpc_type($matches[1]);
							if(isset($matches[2]))
							{
								$returnsDocs = $matches[2];
							}
						}
					}
				}
			}

			// execute introspection of actual function prototype
			$params = array();
			$i = 0;
			foreach($func->getParameters() as $paramobj)
			{
				$params[$i] = array();
				$params[$i]['name'] = '$'.$paramobj->getName();
				$params[$i]['isoptional'] = $paramobj->isOptional();
				$i++;
			}


			// start  building of PHP code to be eval'd
			$innercode = '';
			$i = 0;
			$parsvariations = array();
			$pars = array();
			$pnum = count($params);
			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';
				}

				if($param['isoptional'])
				{
					// this particular parameter is optional. save as valid previous list of parameters
					$innercode .= "if (\$paramcount > $i) {\n";
					$parsvariations[] = $pars;
				}
				$innercode .= "\$p$i = \$msg->getParam($i);\n";
				if ($decode_php_objects)
				{
					$innercode .= "if (\$p{$i}->kindOf() == 'scalar') \$p$i = \$p{$i}->scalarval(); else \$p$i = php_{$prefix}_decode(\$p$i, array('decode_php_objs'));\n";
				}
				else
				{
					$innercode .= "if (\$p{$i}->kindOf() == 'scalar') \$p$i = \$p{$i}->scalarval(); else \$p$i = php_{$prefix}_decode(\$p$i);\n";
				}

				$pars[] = "\$p$i";
				$i++;
				if($param['isoptional'])
				{
					$innercode .= "}\n";
				}
				if($i == $pnum)
				{
					// last allowed parameters combination
					$parsvariations[] = $pars;
				}
			}

			$sigs = array();
			$psigs = array();
			if(count($parsvariations) == 0)
			{
				// only known good synopsis = no parameters
				$parsvariations[] = array();
				$minpars = 0;
			}
			else
			{
				$minpars = count($parsvariations[0]);
			}

			if($minpars)
			{
				// 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;
			}
			else
			{
				$innercode = "\$paramcount = \$msg->getNumParams();\n" . $innercode;
			}

			$innercode .= "\$np = false;\n";
			// since there are no closures in php, if we are given an object instance,
            // we store a pointer to it in a global var...
			if ( is_array($funcname) && is_object($funcname[0]) )
			{
			    $GLOBALS['xmlrpcWPFObjHolder'][$xmlrpcfuncname] =& $funcname[0];
			    $innercode .= "\$obj =& \$GLOBALS['xmlrpcWPFObjHolder']['$xmlrpcfuncname'];\n";
			    $realfuncname = '$obj->'.$funcname[1];
			}
			else
			{
    			$realfuncname = $plainfuncname;
            }
			foreach($parsvariations as $pars)
			{
				$innercode .= "if (\$paramcount == " . count($pars) . ") \$retval = {$catch_warnings}$realfuncname(" . implode(',', $pars) . "); else\n";
				// build a 'generic' signature (only use an appropriate return type)
				$sig = array($returns);
				$psig = array($returnsDocs);
				for($i=0; $i < count($pars); $i++)
				{
					if (isset($paramDocs[$i]['type']))
					{
						$sig[] = php_2_xmlrpc_type($paramDocs[$i]['type']);
					}
					else
					{
						$sig[] = $GLOBALS['xmlrpcValue'];
					}
					$psig[] = isset($paramDocs[$i]['doc']) ? $paramDocs[$i]['doc'] : '';
				}
				$sigs[] = $sig;
				$psigs[] = $psig;
			}
			$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'));";
			}
			else
			{
				if ($encode_php_objects)
					$innercode .= "return new {$prefix}resp(php_{$prefix}_encode(\$retval, array('encode_php_objs')));\n";
				else
					$innercode .= "return new {$prefix}resp(php_{$prefix}_encode(\$retval));\n";
			}
			// shall we exclude functions returning by ref?
			// if($func->returnsReference())
			// 	return false;
			$code = "function $xmlrpcfuncname(\$msg) {\n" . $innercode . "}\n}";
			//print_r($code);
			if ($buildit)
			{
				$allOK = 0;
				eval($code.'$allOK=1;');
				// alternative
				//$xmlrpcfuncname = create_function('$m', $innercode);

				if(!$allOK)
				{
					error_log('XML-RPC: could not create function '.$xmlrpcfuncname.' to wrap php function '.$plainfuncname);
					return false;
				}
			}

			/// @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);
			return $ret;
		}
	}

    /**
    * Given a user-defined PHP class or php object, map its methods onto a list of
	* PHP 'wrapper' functions that can be exposed as xmlrpc methods from an xmlrpc_server
	* object and called from remote clients (as well as their corresponding signature info).
	*
    * @param mixed $classname the name of the class whose methods are to be exposed as xmlrpc methods, or an object instance of that class
    * @param array $extra_options see the docs for wrap_php_method for more options
    *        string method_type 'static', 'nonstatic', 'all' and 'auto' (default); the latter will switch between static and non-static depending on wheter $classname is a class name or object instance
    * @return array or false on failure
    *
    * @todo get_class_methods will return both static and non-static methods.
    *       we have to differentiate the action, depending on wheter we recived a class name or object
    */
    function wrap_php_class($classname, $extra_options=array())
    {
		$methodfilter = isset($extra_options['method_filter']) ? $extra_options['method_filter'] : '';
		$methodtype = isset($extra_options['method_type']) ? $extra_options['method_type'] : 'auto';

        if(version_compare(phpversion(), '5.0.3') == -1)
		{
			// 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');
			return false;
		}

        $result = array();
		$mlist = get_class_methods($classname);
		foreach($mlist as $mname)
		{
    		if ($methodfilter == '' || preg_match($methodfilter, $mname))
			{
    			// echo $mlist."\n";
    			$func =& new ReflectionMethod($classname, $mname);
    			if(!$func->isPrivate() && !$func->isProtected() && !$func->isConstructor() && !$func->isDestructor() && !$func->isAbstract())
    			{
        			if(($func->isStatic && ($methodtype == 'all' || $methodtype == 'static' || ($methodtype == 'auto' && is_string($classname)))) ||
            			(!$func->isStatic && ($methodtype == 'all' || $methodtype == 'nonstatic' || ($methodtype == 'auto' && is_object($classname)))))
            		{
                        $methodwrap = wrap_php_function(array($classname, $mname), '', $extra_options);
                        if ( $methodwrap )
                        {
                            $result[$methodwrap['function']] = $methodwrap['function'];
                        }
                    }
    			}
			}
		}
        return $result;
    }

	/**
	* 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
	*
	* Known limitations:
	* - 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
	* php function.
	* 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='', $newfuncname='')
	{
		// mind numbing: let caller use sane calling convention (as per javadoc, 3 params),
		// OR the 2.0 calling convention (no options) - we really love backward compat, don't we?
		if (!is_array($extra_options))
		{
			$signum = $extra_options;
			$extra_options = array();
		}
		else
		{
			$signum = isset($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']))
		{
			$decode_fault = true;
			$fault_response = $extra_options['return_on_fault'];
		}
		else
		{
			$decode_fault = false;
			$fault_response = '';
		}
		$debug = isset($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);
			return false;
		}
		else
		{
			$msig = $response->value();
			if ($client->return_type != 'phpvals')
			{
				$msig = $decodefunc($msig);
			}
			if(!is_array($msig) || count($msig) <= $signum)
			{
				error_log('XML-RPC: could not retrieve method signature nr.'.$signum.' from remote server for method '.$methodname);
				return false;
			}
			else
			{
				// pick a suitable name for the new function, avoiding collisions
				if($newfuncname != '')
				{
					$xmlrpcfuncname = $newfuncname;
				}
				else
				{
					// take care to insure that methodname is translated to valid
					// php function name
					$xmlrpcfuncname = $prefix.'_'.preg_replace(array('/\./', '/[^a-zA-Z0-9_\x7f-\xff]/'),
						array('_', ''), $methodname);
				}
				while($buildit && function_exists($xmlrpcfuncname))
				{
					$xmlrpcfuncname .= 'x';
				}

				$msig = $msig[$signum];
				$mdesc = '';
				// if in 'offline' mode, get method description too.
				// in online mode, favour speed of operation
				if(!$buildit)
				{
					$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,
					$fault_response);

				//print_r($code);
				if ($buildit)
				{
					$allOK = 0;
					eval($results['source'].'$allOK=1;');
					// alternative
					//$xmlrpcfuncname = create_function('$m', $innercode);
					if($allOK)
					{
						return $xmlrpcfuncname;
					}
					else
					{
						error_log('XML-RPC: could not create function '.$xmlrpcfuncname.' to wrap remote method '.$methodname);
						return false;
					}
				}
				else
				{
					$results['function'] = $xmlrpcfuncname;
					return $results;
				}
			}
		}
	}

	/**
	* 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 $extra_options list of options for wrapped code
	* @return mixed false on error, the name of the created class if all ok or an array with code, class name and comments (if the appropriatevoption is set in extra_options)
	*/
	function wrap_xmlrpc_server($client, $extra_options=array())
	{
		$methodfilter = isset($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');
			return false;
		}
		else
		{
			$mlist = $response->value();
			if ($client->return_type != 'phpvals')
			{
				$mlist = $decodefunc($mlist);
			}
			if(!is_array($mlist) || !count($mlist))
			{
				error_log('XML-RPC: could not retrieve meaningful method list from remote server');
				return false;
			}
			else
			{
				// pick a suitable name for the new function, avoiding collisions
				if($newclassname != '')
				{
					$xmlrpcclassname = $newclassname;
				}
				else
				{
					$xmlrpcclassname = $prefix.'_'.preg_replace(array('/\./', '/[^a-zA-Z0-9_\x7f-\xff]/'),
						array('_', ''), $client->server).'_client';
				}
				while($buildit && class_exists($xmlrpcclassname))
				{
					$xmlrpcclassname .= 'x';
				}

				/// @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]/'),
							array('_', ''), $mname);
						$methodwrap = wrap_xmlrpc_method($client, $mname, $opts);
						if ($methodwrap)
						{
							if (!$buildit)
							{
								$source .= $methodwrap['docstring'];
							}
							$source .= $methodwrap['source']."\n";
						}
						else
						{
							error_log('XML-RPC: will not create class method to wrap remote method '.$mname);
						}
					}
				}
				$source .= "}\n";
				if ($buildit)
				{
					$allOK = 0;
					eval($source.'$allOK=1;');
					// alternative
					//$xmlrpcfuncname = create_function('$m', $innercode);
					if($allOK)
					{
						return $xmlrpcclassname;
					}
					else
					{
						error_log('XML-RPC: could not create class '.$xmlrpcclassname.' to wrap remote server '.$client->server);
						return false;
					}
				}
				else
				{
					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...
	* @access private
	*/
	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,
		$fault_response='')
	{
		$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";
			$this_ = '';
		}
		else
		{
			// client copy mode 2 == no client copy in emitted code
			$innercode = '';
			$this_ = 'this->';
		}
		$innercode .= "\$msg =& new {$prefix}msg('$methodname');\n";

		if ($mdesc != '')
		{
			// take care that PHP comment is not terminated unwillingly by method description
			$mdesc = "/**\n* ".str_replace('*/', '* /', $mdesc)."\n";
		}
		else
		{
			$mdesc = "/**\nFunction $xmlrpcfuncname\n";
		}

		// param parsing
		$plist = array();
		$pcount = count($msig);
		for($i = 1; $i < $pcount; $i++)
		{
			$plist[] = "\$p$i";
			$ptype = $msig[$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, '$ptype');\n";
			}
			else
			{
				if ($encode_php_objects)
				{
					$innercode .= "\$p$i =& php_{$prefix}_encode(\$p$i, array('encode_php_objs'));\n";
				}
				else
				{
					$innercode .= "\$p$i =& php_{$prefix}_encode(\$p$i);\n";
				}
			}
			$innercode .= "\$msg->addparam(\$p$i);\n";
			$mdesc .= '* @param '.xmlrpc_2_php_type($ptype)." \$p$i\n";
		}
		if ($client_copy_mode < 2)
		{
			$plist[] = '$debug=0';
			$mdesc .= "* @param int \$debug when 1 (or 2) will enable debugging of the underlying {$prefix} call (defaults to 0)\n";
		}
		$plist = implode(', ', $plist);
		$mdesc .= '* @return '.xmlrpc_2_php_type($msig[0])." (or an {$prefix}resp obj instance if call fails)\n*/\n";

		$innercode .= "\$res =& \${$this_}client->send(\$msg, $timeout, '$protocol');\n";
		if ($decode_fault)
		{
			if (is_string($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)."')";
			}
			else
			{
				$respcode = var_export($fault_response, true);
			}
		}
		else
		{
			$respcode = '$res';
		}
		if ($decode_php_objects)
		{
			$innercode .= "if (\$res->faultcode()) return $respcode; else return php_{$prefix}_decode(\$res->value(), array('decode_php_objs'));";
		}
		else
		{
			$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.
	* @access private
	*/
	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')
				{
					$val = var_export($val, true);
					$code .= "\$client->$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";
		return $code;
	}
?>