1 | <?php |
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2 | // +-----------------------------------------------------------------------+ |
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3 | // | Piwigo - a PHP based photo gallery | |
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4 | // +-----------------------------------------------------------------------+ |
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5 | // | Copyright(C) 2008-2012 Piwigo Team http://piwigo.org | |
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6 | // | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net | |
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7 | // | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick | |
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8 | // +-----------------------------------------------------------------------+ |
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9 | // | This program is free software; you can redistribute it and/or modify | |
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10 | // | it under the terms of the GNU General Public License as published by | |
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11 | // | the Free Software Foundation | |
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12 | // | | |
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13 | // | This program is distributed in the hope that it will be useful, but | |
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14 | // | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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15 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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16 | // | General Public License for more details. | |
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17 | // | | |
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18 | // | You should have received a copy of the GNU General Public License | |
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19 | // | along with this program; if not, write to the Free Software | |
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20 | // | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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21 | // | USA. | |
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22 | // +-----------------------------------------------------------------------+ |
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23 | |
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24 | /**** WEB SERVICE CORE CLASSES************************************************ |
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25 | * PwgServer - main object - the link between web service methods, request |
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26 | * handler and response encoder |
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27 | * PwgRequestHandler - base class for handlers |
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28 | * PwgResponseEncoder - base class for response encoders |
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29 | * PwgError, PwgNamedArray, PwgNamedStruct - can be used by web service functions |
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30 | * as return values |
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31 | */ |
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32 | |
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33 | |
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34 | define( 'WS_PARAM_ACCEPT_ARRAY', 0x010000 ); |
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35 | define( 'WS_PARAM_FORCE_ARRAY', 0x030000 ); |
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36 | define( 'WS_PARAM_OPTIONAL', 0x040000 ); |
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37 | |
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38 | define( 'WS_ERR_INVALID_METHOD', 501 ); |
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39 | define( 'WS_ERR_MISSING_PARAM', 1002 ); |
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40 | define( 'WS_ERR_INVALID_PARAM', 1003 ); |
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41 | |
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42 | define( 'WS_XML_ATTRIBUTES', 'attributes_xml_'); |
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43 | define( 'WS_XML_CONTENT', 'content_xml_'); |
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44 | |
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45 | /** |
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46 | * PwgError object can be returned from any web service function implementation. |
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47 | */ |
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48 | class PwgError |
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49 | { |
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50 | private $_code; |
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51 | private $_codeText; |
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52 | |
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53 | function PwgError($code, $codeText) |
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54 | { |
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55 | if ($code>=400 and $code<600) |
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56 | { |
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57 | set_status_header($code, $codeText); |
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58 | } |
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59 | |
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60 | $this->_code = $code; |
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61 | $this->_codeText = $codeText; |
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62 | } |
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63 | |
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64 | function code() { return $this->_code; } |
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65 | function message() { return $this->_codeText; } |
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66 | } |
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67 | |
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68 | /** |
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69 | * Simple wrapper around an array (keys are consecutive integers starting at 0). |
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70 | * Provides naming clues for xml output (xml attributes vs. xml child elements?) |
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71 | * Usually returned by web service function implementation. |
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72 | */ |
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73 | class PwgNamedArray |
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74 | { |
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75 | /*private*/ var $_content; |
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76 | /*private*/ var $_itemName; |
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77 | /*private*/ var $_xmlAttributes; |
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78 | |
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79 | /** |
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80 | * Constructs a named array |
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81 | * @param arr array (keys must be consecutive integers starting at 0) |
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82 | * @param itemName string xml element name for values of arr (e.g. image) |
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83 | * @param xmlAttributes array of sub-item attributes that will be encoded as |
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84 | * xml attributes instead of xml child elements |
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85 | */ |
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86 | function PwgNamedArray($arr, $itemName, $xmlAttributes=array() ) |
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87 | { |
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88 | $this->_content = $arr; |
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89 | $this->_itemName = $itemName; |
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90 | $this->_xmlAttributes = array_flip($xmlAttributes); |
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91 | } |
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92 | } |
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93 | /** |
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94 | * Simple wrapper around a "struct" (php array whose keys are not consecutive |
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95 | * integers starting at 0). Provides naming clues for xml output (what is xml |
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96 | * attributes and what is element) |
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97 | */ |
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98 | class PwgNamedStruct |
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99 | { |
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100 | /*private*/ var $_content; |
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101 | /*private*/ var $_name; |
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102 | /*private*/ var $_xmlAttributes; |
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103 | |
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104 | /** |
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105 | * Constructs a named struct (usually returned by web service function |
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106 | * implementation) |
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107 | * @param name string - containing xml element name |
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108 | * @param content array - the actual content (php array) |
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109 | * @param xmlAttributes array - name of the keys in $content that will be |
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110 | * encoded as xml attributes (if null - automatically prefer xml attributes |
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111 | * whenever possible) |
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112 | */ |
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113 | function PwgNamedStruct($name, $content, $xmlAttributes=null, $xmlElements=null ) |
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114 | { |
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115 | $this->_name = $name; |
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116 | $this->_content = $content; |
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117 | if ( isset($xmlAttributes) ) |
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118 | { |
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119 | $this->_xmlAttributes = array_flip($xmlAttributes); |
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120 | } |
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121 | else |
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122 | { |
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123 | $this->_xmlAttributes = array(); |
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124 | foreach ($this->_content as $key=>$value) |
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125 | { |
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126 | if (!empty($key) and (is_scalar($value) or is_null($value)) ) |
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127 | { |
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128 | if ( empty($xmlElements) or !in_array($key,$xmlElements) ) |
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129 | { |
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130 | $this->_xmlAttributes[$key]=1; |
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131 | } |
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132 | } |
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133 | } |
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134 | } |
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135 | } |
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136 | } |
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137 | |
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138 | |
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139 | /** |
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140 | * Abstract base class for request handlers. |
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141 | */ |
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142 | class PwgRequestHandler |
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143 | { |
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144 | /** Virtual abstract method. Decodes the request (GET or POST) handles the |
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145 | * method invocation as well as response sending. |
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146 | */ |
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147 | function handleRequest(&$server) { assert(false); } |
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148 | } |
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149 | |
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150 | /** |
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151 | * |
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152 | * Base class for web service response encoder. |
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153 | */ |
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154 | class PwgResponseEncoder |
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155 | { |
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156 | /** encodes the web service response to the appropriate output format |
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157 | * @param response mixed the unencoded result of a service method call |
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158 | */ |
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159 | function encodeResponse($response) { assert(false); } |
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160 | |
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161 | /** default "Content-Type" http header for this kind of response format |
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162 | */ |
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163 | function getContentType() { assert(false); } |
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164 | |
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165 | /** |
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166 | * returns true if the parameter is a 'struct' (php array type whose keys are |
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167 | * NOT consecutive integers starting with 0) |
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168 | */ |
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169 | static function is_struct(&$data) |
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170 | { |
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171 | if (is_array($data) ) |
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172 | { |
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173 | if (range(0, count($data) - 1) !== array_keys($data) ) |
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174 | { # string keys, unordered, non-incremental keys, .. - whatever, make object |
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175 | return true; |
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176 | } |
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177 | } |
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178 | return false; |
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179 | } |
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180 | |
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181 | /** |
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182 | * removes all XML formatting from $response (named array, named structs, etc) |
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183 | * usually called by every response encoder, except rest xml. |
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184 | */ |
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185 | static function flattenResponse(&$response) |
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186 | { |
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187 | PwgResponseEncoder::_mergeAttributesAndContent($response); |
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188 | PwgResponseEncoder::_removeNamedArray($response); |
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189 | PwgResponseEncoder::_removeNamedStruct($response); |
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190 | if (is_array($response)) |
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191 | { // need to call 2 times (first time might add new arrays) |
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192 | array_walk_recursive($response, array('PwgResponseEncoder', '_remove_named_callback') ); |
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193 | array_walk_recursive($response, array('PwgResponseEncoder', '_remove_named_callback') ); |
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194 | } |
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195 | //print_r($response); |
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196 | PwgResponseEncoder::_mergeAttributesAndContent($response); |
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197 | } |
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198 | |
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199 | private static function _remove_named_callback(&$value, $key) |
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200 | { |
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201 | do |
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202 | { |
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203 | $changed = 0; |
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204 | $changed += PwgResponseEncoder::_removeNamedArray($value); |
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205 | $changed += PwgResponseEncoder::_removeNamedStruct($value); |
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206 | // print_r('walk '.$key."<br>\n"); |
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207 | } |
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208 | while ($changed); |
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209 | } |
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210 | |
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211 | private static function _mergeAttributesAndContent(&$value) |
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212 | { |
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213 | if ( !is_array($value) ) |
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214 | return; |
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215 | /* $first_key = ''; |
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216 | if (count($value)) { $ak = array_keys($value); $first_key = $ak[0]; } |
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217 | |
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218 | print_r( '_mergeAttributesAndContent is_struct='.PwgResponseEncoder::is_struct($value) |
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219 | .' count='.count($value) |
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220 | .' first_key='.$first_key |
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221 | ."<br>\n" |
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222 | );*/ |
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223 | $ret = 0; |
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224 | if (PwgResponseEncoder::is_struct($value)) |
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225 | { |
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226 | if ( isset($value[WS_XML_ATTRIBUTES]) ) |
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227 | { |
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228 | $value = array_merge( $value, $value[WS_XML_ATTRIBUTES] ); |
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229 | unset( $value[WS_XML_ATTRIBUTES] ); |
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230 | $ret=1; |
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231 | } |
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232 | if ( isset($value[WS_XML_CONTENT]) ) |
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233 | { |
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234 | $cont_processed = 0; |
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235 | if ( count($value)==1 ) |
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236 | { |
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237 | $value = $value[WS_XML_CONTENT]; |
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238 | $cont_processed=1; |
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239 | } |
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240 | else |
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241 | { |
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242 | if (PwgResponseEncoder::is_struct($value[WS_XML_CONTENT])) |
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243 | { |
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244 | $value = array_merge( $value, $value[WS_XML_CONTENT] ); |
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245 | unset( $value[WS_XML_CONTENT] ); |
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246 | $cont_processed=1; |
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247 | } |
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248 | } |
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249 | $ret += $cont_processed; |
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250 | if (!$cont_processed) |
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251 | { |
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252 | $value['_content'] = $value[WS_XML_CONTENT]; |
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253 | unset( $value[WS_XML_CONTENT] ); |
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254 | $ret++; |
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255 | } |
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256 | } |
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257 | } |
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258 | |
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259 | foreach ($value as $key=>$v) |
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260 | { |
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261 | if ( PwgResponseEncoder::_mergeAttributesAndContent($v) ) |
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262 | { |
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263 | $value[$key]=$v; |
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264 | $ret++; |
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265 | } |
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266 | } |
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267 | return $ret; |
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268 | } |
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269 | |
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270 | private static function _removeNamedArray(&$value) |
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271 | { |
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272 | if ( strtolower( @get_class($value) ) =='pwgnamedarray') |
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273 | { |
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274 | $value = $value->_content; |
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275 | return 1; |
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276 | } |
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277 | return 0; |
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278 | } |
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279 | |
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280 | private static function _removeNamedStruct(&$value) |
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281 | { |
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282 | if ( strtolower( @get_class($value) ) =='pwgnamedstruct') |
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283 | { |
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284 | if ( isset($value->_content['']) ) |
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285 | { |
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286 | $unknown = $value->_content['']; |
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287 | unset( $value->_content[''] ); |
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288 | $value->_content[$value->_name] = $unknown; |
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289 | } |
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290 | $value = $value->_content; |
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291 | return 1; |
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292 | } |
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293 | return 0; |
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294 | } |
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295 | } |
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296 | |
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297 | |
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298 | |
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299 | class PwgServer |
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300 | { |
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301 | var $_requestHandler; |
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302 | var $_requestFormat; |
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303 | var $_responseEncoder; |
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304 | var $_responseFormat; |
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305 | |
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306 | var $_methods = array(); |
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307 | |
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308 | function PwgServer() |
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309 | { |
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310 | } |
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311 | |
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312 | /** |
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313 | * Initializes the request handler. |
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314 | */ |
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315 | function setHandler($requestFormat, &$requestHandler) |
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316 | { |
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317 | $this->_requestHandler = &$requestHandler; |
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318 | $this->_requestFormat = $requestFormat; |
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319 | } |
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320 | |
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321 | /** |
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322 | * Initializes the request handler. |
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323 | */ |
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324 | function setEncoder($responseFormat, &$encoder) |
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325 | { |
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326 | $this->_responseEncoder = &$encoder; |
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327 | $this->_responseFormat = $responseFormat; |
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328 | } |
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329 | |
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330 | /** |
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331 | * Runs the web service call (handler and response encoder should have been |
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332 | * created) |
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333 | */ |
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334 | function run() |
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335 | { |
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336 | if ( is_null($this->_responseEncoder) ) |
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337 | { |
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338 | set_status_header(400); |
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339 | @header("Content-Type: text/plain"); |
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340 | echo ("Cannot process your request. Unknown response format. |
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341 | Request format: ".@$this->_requestFormat." Response format: ".@$this->_responseFormat."\n"); |
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342 | var_export($this); |
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343 | die(0); |
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344 | } |
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345 | |
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346 | if ( is_null($this->_requestHandler) ) |
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347 | { |
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348 | $this->sendResponse( new PwgError(400, 'Unknown request format') ); |
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349 | return; |
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350 | } |
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351 | |
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352 | $this->addMethod('reflection.getMethodList', |
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353 | array('PwgServer', 'ws_getMethodList'), |
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354 | null, '' ); |
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355 | $this->addMethod('reflection.getMethodDetails', |
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356 | array('PwgServer', 'ws_getMethodDetails'), |
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357 | array('methodName'),''); |
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358 | |
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359 | trigger_action('ws_add_methods', array(&$this) ); |
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360 | uksort( $this->_methods, 'strnatcmp' ); |
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361 | $this->_requestHandler->handleRequest($this); |
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362 | } |
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363 | |
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364 | /** |
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365 | * Encodes a response and sends it back to the browser. |
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366 | */ |
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367 | function sendResponse($response) |
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368 | { |
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369 | $encodedResponse = $this->_responseEncoder->encodeResponse($response); |
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370 | $contentType = $this->_responseEncoder->getContentType(); |
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371 | |
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372 | @header('Content-Type: '.$contentType.'; charset='.get_pwg_charset()); |
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373 | print_r($encodedResponse); |
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374 | trigger_action('sendResponse', $encodedResponse ); |
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375 | } |
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376 | |
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377 | /** |
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378 | * Registers a web service method. |
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379 | * @param methodName string - the name of the method as seen externally |
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380 | * @param callback mixed - php method to be invoked internally |
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381 | * @param params array - map of allowed parameter names with optional default |
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382 | * values and parameter flags. Example of $params: |
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383 | * array( 'param1' => array('default'=>523, 'flags'=>WS_PARAM_FORCE_ARRAY) ) . |
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384 | * Possible parameter flags are: |
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385 | * WS_PARAM_ALLOW_ARRAY - this parameter can be an array |
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386 | * WS_PARAM_FORCE_ARRAY - if this parameter is scalar, force it to an array |
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387 | * before invoking the method |
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388 | * @param description string - a description of the method. |
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389 | */ |
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390 | function addMethod($methodName, $callback, $params=array(), $description, $include_file='') |
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391 | { |
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392 | if (!is_array($params)) |
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393 | { |
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394 | $params = array(); |
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395 | } |
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396 | |
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397 | if ( range(0, count($params) - 1) === array_keys($params) ) |
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398 | { |
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399 | $params = array_flip($params); |
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400 | } |
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401 | |
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402 | foreach( $params as $param=>$options) |
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403 | { |
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404 | if ( !is_array($options) ) |
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405 | { |
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406 | $params[$param] = array('flags'=>0); |
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407 | } |
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408 | else |
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409 | { |
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410 | $flags = isset($options['flags']) ? $options['flags'] : 0; |
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411 | if ( array_key_exists('default', $options) ) |
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412 | { |
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413 | $flags |= WS_PARAM_OPTIONAL; |
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414 | } |
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415 | if ( $flags & WS_PARAM_FORCE_ARRAY ) |
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416 | { |
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417 | $flags |= WS_PARAM_ACCEPT_ARRAY; |
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418 | } |
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419 | $options['flags'] = $flags; |
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420 | $params[$param] = $options; |
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421 | } |
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422 | } |
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423 | |
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424 | $this->_methods[$methodName] = array( |
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425 | 'callback' => $callback, |
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426 | 'description' => $description, |
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427 | 'signature' => $params, |
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428 | 'include' => $include_file, |
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429 | ); |
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430 | } |
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431 | |
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432 | function hasMethod($methodName) |
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433 | { |
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434 | return isset($this->_methods[$methodName]); |
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435 | } |
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436 | |
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437 | function getMethodDescription($methodName) |
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438 | { |
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439 | $desc = @$this->_methods[$methodName]['description']; |
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440 | return isset($desc) ? $desc : ''; |
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441 | } |
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442 | |
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443 | function getMethodSignature($methodName) |
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444 | { |
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445 | $signature = @$this->_methods[$methodName]['signature']; |
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446 | return isset($signature) ? $signature : array(); |
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447 | } |
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448 | |
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449 | /*static*/ function isPost() |
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450 | { |
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451 | return isset($HTTP_RAW_POST_DATA) or !empty($_POST); |
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452 | } |
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453 | |
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454 | /*static*/ function makeArrayParam(&$param) |
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455 | { |
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456 | if ( $param==null ) |
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457 | { |
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458 | $param = array(); |
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459 | } |
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460 | else |
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461 | { |
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462 | if (! is_array($param) ) |
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463 | { |
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464 | $param = array($param); |
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465 | } |
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466 | } |
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467 | } |
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468 | |
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469 | /** |
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470 | * Invokes a registered method. Returns the return of the method (or |
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471 | * a PwgError object if the method is not found) |
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472 | * @param methodName string the name of the method to invoke |
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473 | * @param params array array of parameters to pass to the invoked method |
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474 | */ |
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475 | function invoke($methodName, $params) |
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476 | { |
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477 | $method = @$this->_methods[$methodName]; |
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478 | |
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479 | if ( $method==null ) |
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480 | { |
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481 | return new PwgError(WS_ERR_INVALID_METHOD, 'Method name is not valid'); |
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482 | } |
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483 | |
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484 | // parameter check and data coercion ! |
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485 | $signature = $method['signature']; |
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486 | $missing_params = array(); |
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487 | foreach($signature as $name=>$options) |
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488 | { |
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489 | $flags = $options['flags']; |
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490 | if ( !array_key_exists($name, $params) ) |
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491 | {// parameter not provided in the request |
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492 | if ( !($flags&WS_PARAM_OPTIONAL) ) |
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493 | { |
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494 | $missing_params[] = $name; |
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495 | } |
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496 | else if ( array_key_exists('default',$options) ) |
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497 | { |
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498 | $params[$name] = $options['default']; |
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499 | if ( ($flags&WS_PARAM_FORCE_ARRAY) ) |
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500 | { |
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501 | $this->makeArrayParam( $params[$name] ); |
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502 | } |
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503 | } |
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504 | } |
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505 | else |
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506 | {// parameter provided - do some basic checks |
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507 | $the_param = $params[$name]; |
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508 | if ( is_array($the_param) and ($flags&WS_PARAM_ACCEPT_ARRAY)==0 ) |
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509 | { |
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510 | return new PwgError(WS_ERR_INVALID_PARAM, $name.' must be scalar' ); |
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511 | } |
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512 | if ( ($flags&WS_PARAM_FORCE_ARRAY) ) |
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513 | { |
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514 | $this->makeArrayParam( $the_param ); |
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515 | } |
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516 | if ( isset($options['maxValue']) and $the_param>$options['maxValue']) |
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517 | { |
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518 | $the_param = $options['maxValue']; |
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519 | } |
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520 | $params[$name] = $the_param; |
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521 | } |
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522 | } |
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523 | if (count($missing_params)) |
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524 | { |
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525 | return new PwgError(WS_ERR_MISSING_PARAM, 'Missing parameters: '.implode(',',$missing_params)); |
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526 | } |
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527 | $result = trigger_event('ws_invoke_allowed', true, $methodName, $params); |
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528 | if ( strtolower( @get_class($result) )!='pwgerror') |
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529 | { |
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530 | if ( !empty($method['include']) ) |
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531 | { |
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532 | include_once( $method['include'] ); |
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533 | } |
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534 | $result = call_user_func_array($method['callback'], array($params, &$this) ); |
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535 | } |
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536 | return $result; |
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537 | } |
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538 | |
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539 | /** |
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540 | * WS reflection method implementation: lists all available methods |
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541 | */ |
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542 | static function ws_getMethodList($params, &$service) |
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543 | { |
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544 | return array('methods' => new PwgNamedArray( array_keys($service->_methods),'method' ) ); |
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545 | } |
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546 | |
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547 | /** |
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548 | * WS reflection method implementation: gets information about a given method |
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549 | */ |
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550 | static function ws_getMethodDetails($params, &$service) |
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551 | { |
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552 | $methodName = $params['methodName']; |
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553 | if (!$service->hasMethod($methodName)) |
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554 | { |
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555 | return new PwgError(WS_ERR_INVALID_PARAM, |
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556 | 'Requested method does not exist'); |
---|
557 | } |
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558 | $res = array( |
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559 | 'name' => $methodName, |
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560 | 'description' => $service->getMethodDescription($methodName), |
---|
561 | 'params' => array(), |
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562 | ); |
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563 | $signature = $service->getMethodSignature($methodName); |
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564 | foreach ($signature as $name => $options) |
---|
565 | { |
---|
566 | $param_data = array( |
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567 | 'name' => $name, |
---|
568 | 'optional' => ($options['flags']&WS_PARAM_OPTIONAL)?true:false, |
---|
569 | 'acceptArray' => ($options['flags']&WS_PARAM_ACCEPT_ARRAY)?true:false, |
---|
570 | ); |
---|
571 | if (isset($options['default'])) |
---|
572 | { |
---|
573 | $param_data['defaultValue'] = $options['default']; |
---|
574 | } |
---|
575 | $res['params'][] = $param_data; |
---|
576 | } |
---|
577 | return $res; |
---|
578 | } |
---|
579 | } |
---|
580 | ?> |
---|