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969
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "RestApiHierarchy.h"
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34
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35 #include <cassert>
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36
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37 namespace Orthanc
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38 {
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972
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39 RestApiHierarchy::Handlers::Handlers() :
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40 getHandler_(NULL),
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41 postHandler_(NULL),
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42 putHandler_(NULL),
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43 deleteHandler_(NULL)
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44 {
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45 }
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46
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47
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48 bool RestApiHierarchy::Handlers::HasHandler(HttpMethod method) const
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49 {
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50 switch (method)
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51 {
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52 case HttpMethod_Get:
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53 return getHandler_ != NULL;
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54
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55 case HttpMethod_Post:
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56 return postHandler_ != NULL;
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57
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58 case HttpMethod_Put:
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59 return putHandler_ != NULL;
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60
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61 case HttpMethod_Delete:
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62 return deleteHandler_ != NULL;
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63
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64 default:
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65 throw OrthancException(ErrorCode_ParameterOutOfRange);
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66 }
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67 }
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68
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69
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969
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70 bool RestApiHierarchy::Handlers::IsEmpty() const
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71 {
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972
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72 return (getHandler_ == NULL &&
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73 postHandler_ == NULL &&
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74 putHandler_ == NULL &&
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75 deleteHandler_ == NULL);
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76 }
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77
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78
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79 RestApi::GetHandler RestApiHierarchy::Handlers::GetGetHandler() const
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80 {
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81 assert(getHandler_ != NULL);
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82 return getHandler_;
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83 }
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84
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85 RestApi::PutHandler RestApiHierarchy::Handlers::GetPutHandler() const
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86 {
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87 assert(putHandler_ != NULL);
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88 return putHandler_;
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89 }
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90
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91 RestApi::PostHandler RestApiHierarchy::Handlers::GetPostHandler() const
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92 {
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93 assert(postHandler_ != NULL);
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94 return postHandler_;
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95 }
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96
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97 RestApi::DeleteHandler RestApiHierarchy::Handlers::GetDeleteHandler() const
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98 {
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99 assert(deleteHandler_ != NULL);
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100 return deleteHandler_;
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969
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101 }
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102
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103
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104 RestApiHierarchy& RestApiHierarchy::AddChild(Children& children,
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105 const std::string& name)
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106 {
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107 Children::iterator it = children.find(name);
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108
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109 if (it == children.end())
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110 {
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111 // Create new child
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112 RestApiHierarchy *child = new RestApiHierarchy;
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113 children[name] = child;
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114 return *child;
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115 }
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116 else
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117 {
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118 return *it->second;
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119 }
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120 }
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121
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122
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123 void RestApiHierarchy::DeleteChildren(Children& children)
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124 {
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125 for (Children::iterator it = children.begin();
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126 it != children.end(); it++)
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127 {
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128 delete it->second;
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129 }
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130 }
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131
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132
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133 template <typename Handler>
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134 void RestApiHierarchy::RegisterInternal(const RestApiPath& path,
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135 Handler handler,
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136 size_t level)
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137 {
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138 if (path.GetLevelCount() == level)
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139 {
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140 if (path.IsUniversalTrailing())
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141 {
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142 universalHandlers_.Register(handler);
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143 }
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144 else
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145 {
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146 handlers_.Register(handler);
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147 }
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148 }
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149 else
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150 {
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151 RestApiHierarchy* child;
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152 if (path.IsWildcardLevel(level))
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153 {
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154 child = &AddChild(wildcardChildren_, path.GetWildcardName(level));
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155 }
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156 else
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157 {
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158 child = &AddChild(children_, path.GetLevelName(level));
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159 }
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160
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161 child->RegisterInternal(path, handler, level + 1);
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162 }
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163 }
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164
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165
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166 bool RestApiHierarchy::LookupHandler(RestApiPath::Components& components,
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167 const UriComponents& uri,
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168 ResourceCallback callback,
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169 size_t level,
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170 void* call)
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171 {
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172 assert(uri.size() >= level);
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173 UriComponents trailing;
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174
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175 // Look for an exact match on the resource of interest
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176 if (uri.size() == level)
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177 {
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178 if (!handlers_.IsEmpty() &&
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179 callback(handlers_, uri, components, trailing, call))
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180 {
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181 return true;
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182 }
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183 }
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184
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185
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186 // Try and go down in the hierarchy, using an exact match for the child
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187 Children::const_iterator child = children_.find(uri[level]);
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188 if (child != children_.end())
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189 {
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190 if (child->second->LookupHandler(components, uri, callback, level + 1, call))
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191 {
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192 return true;
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193 }
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194 }
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195
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196
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197 // Try and go down in the hierarchy, using wildcard rules for children
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198 for (child = wildcardChildren_.begin();
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199 child != wildcardChildren_.end(); child++)
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200 {
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201 RestApiPath::Components subComponents = components;
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202 subComponents[child->first] = uri[level];
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203
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204 if (child->second->LookupHandler(components, uri, callback, level + 1, call))
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205 {
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206 return true;
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207 }
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208 }
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209
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210
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211 // As a last resort, call the universal handlers, if any
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212 if (!universalHandlers_.IsEmpty())
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213 {
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214 trailing.resize(uri.size() - level);
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215 size_t pos = 0;
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216 for (size_t i = level; i < uri.size(); i++, pos++)
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217 {
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218 trailing[pos] = uri[i];
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219 }
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220
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221 assert(pos == trailing.size());
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222
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223 if (callback(universalHandlers_, uri, components, trailing, call))
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224 {
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225 return true;
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226 }
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227 }
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228
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229 return false;
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230 }
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231
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232
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233 bool RestApiHierarchy::GetDirectory(Json::Value& result,
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234 const UriComponents& uri,
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235 size_t level)
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236 {
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237 if (uri.size() == level)
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238 {
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972
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239 if (!handlers_.HasHandler(HttpMethod_Get) &&
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969
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240 universalHandlers_.IsEmpty() &&
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241 wildcardChildren_.size() == 0)
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242 {
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243 result = Json::arrayValue;
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244
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245 for (Children::const_iterator it = children_.begin();
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246 it != children_.end(); it++)
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247 {
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248 result.append(it->first);
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249 }
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250
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251 return true;
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252 }
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253 else
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254 {
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255 return false;
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256 }
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257 }
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258
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259 Children::const_iterator child = children_.find(uri[level]);
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260 if (child != children_.end())
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261 {
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262 if (child->second->GetDirectory(result, uri, level + 1))
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263 {
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264 return true;
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265 }
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266 }
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267
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268 for (child = wildcardChildren_.begin();
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269 child != wildcardChildren_.end(); child++)
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270 {
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271 if (child->second->GetDirectory(result, uri, level + 1))
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272 {
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273 return true;
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274 }
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275 }
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276
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277 return false;
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278 }
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279
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280
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281 bool RestApiHierarchy::GetCallback(Handlers& handlers,
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282 const UriComponents& uri,
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283 const RestApiPath::Components& components,
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284 const UriComponents& trailing,
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285 void* call)
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286 {
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972
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287 if (handlers.HasHandler(HttpMethod_Get))
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969
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288 {
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972
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289 handlers.GetGetHandler() (*reinterpret_cast<RestApi::GetCall*>(call));
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969
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290 return true;
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291 }
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972
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292 else
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293 {
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294 return false;
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295 }
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969
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296 }
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297
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298
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299 bool RestApiHierarchy::PostCallback(Handlers& handlers,
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300 const UriComponents& uri,
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301 const RestApiPath::Components& components,
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302 const UriComponents& trailing,
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303 void* call)
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304 {
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972
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305 if (handlers.HasHandler(HttpMethod_Post))
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969
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306 {
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972
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307 handlers.GetPostHandler() (*reinterpret_cast<RestApi::PostCall*>(call));
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969
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308 return true;
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309 }
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972
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310 else
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311 {
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312 return false;
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313 }
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969
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314 }
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315
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316
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317 bool RestApiHierarchy::PutCallback(Handlers& handlers,
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318 const UriComponents& uri,
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319 const RestApiPath::Components& components,
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320 const UriComponents& trailing,
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321 void* call)
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322 {
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972
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323 if (handlers.HasHandler(HttpMethod_Put))
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969
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324 {
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972
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325 handlers.GetPutHandler() (*reinterpret_cast<RestApi::PutCall*>(call));
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969
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326 return true;
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327 }
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972
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328 else
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329 {
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330 return false;
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331 }
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969
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332 }
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333
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334
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335 bool RestApiHierarchy::DeleteCallback(Handlers& handlers,
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336 const UriComponents& uri,
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337 const RestApiPath::Components& components,
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338 const UriComponents& trailing,
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339 void* call)
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340 {
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972
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341 if (handlers.HasHandler(HttpMethod_Delete))
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969
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342 {
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972
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343 handlers.GetDeleteHandler() (*reinterpret_cast<RestApi::DeleteCall*>(call));
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969
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344 return true;
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345 }
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972
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346 else
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347 {
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348 return false;
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349 }
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969
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350 }
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351
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352
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353 RestApiHierarchy::~RestApiHierarchy()
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354 {
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355 DeleteChildren(children_);
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356 DeleteChildren(wildcardChildren_);
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357 }
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358
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970
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359 void RestApiHierarchy::Register(const std::string& uri,
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969
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360 RestApi::GetHandler handler)
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361 {
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970
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362 RestApiPath path(uri);
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969
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363 RegisterInternal(path, handler, 0);
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364 }
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365
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970
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366 void RestApiHierarchy::Register(const std::string& uri,
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969
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367 RestApi::PutHandler handler)
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368 {
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970
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369 RestApiPath path(uri);
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969
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370 RegisterInternal(path, handler, 0);
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371 }
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372
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970
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373 void RestApiHierarchy::Register(const std::string& uri,
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969
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374 RestApi::PostHandler handler)
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375 {
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970
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376 RestApiPath path(uri);
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969
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377 RegisterInternal(path, handler, 0);
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378 }
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379
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970
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380 void RestApiHierarchy::Register(const std::string& uri,
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969
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381 RestApi::DeleteHandler handler)
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382 {
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970
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383 RestApiPath path(uri);
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969
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384 RegisterInternal(path, handler, 0);
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385 }
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386
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387 void RestApiHierarchy::CreateSiteMap(Json::Value& target) const
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388 {
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389 if (children_.size() == 0)
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390 {
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391 std::string s = " ";
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972
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392 if (handlers_.HasHandler(HttpMethod_Get))
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969
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393 {
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394 s += "GET ";
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395 }
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396
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972
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397 if (handlers_.HasHandler(HttpMethod_Post))
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969
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398 {
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399 s += "POST ";
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400 }
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401
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972
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402 if (handlers_.HasHandler(HttpMethod_Put))
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969
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403 {
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404 s += "PUT ";
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405 }
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406
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972
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407 if (handlers_.HasHandler(HttpMethod_Delete))
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969
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408 {
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409 s += "DELETE ";
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410 }
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411
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412 target = s;
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413 }
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414 else
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415 {
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416 target = Json::objectValue;
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417
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418 for (Children::const_iterator it = children_.begin();
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419 it != children_.end(); it++)
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420 {
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421 it->second->CreateSiteMap(target[it->first]);
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422 }
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423 }
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424
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425 /*for (Children::const_iterator it = wildcardChildren_.begin();
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426 it != wildcardChildren_.end(); it++)
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427 {
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428 it->second->CreateSiteMap(target["* (" + it->first + ")"]);
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429 }*/
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430 }
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431
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432 bool RestApiHierarchy::Handle(RestApi::GetCall& call,
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433 const UriComponents& uri)
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434 {
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435 RestApiPath::Components components;
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436 return LookupHandler(components, uri, GetCallback, 0, &call);
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437 }
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438
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439 bool RestApiHierarchy::Handle(RestApi::PutCall& call,
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440 const UriComponents& uri)
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441 {
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442 RestApiPath::Components components;
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443 return LookupHandler(components, uri, PutCallback, 0, &call);
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444 }
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445
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446 bool RestApiHierarchy::Handle(RestApi::PostCall& call,
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447 const UriComponents& uri)
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448 {
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449 RestApiPath::Components components;
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450 return LookupHandler(components, uri, PostCallback, 0, &call);
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451 }
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452
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453 bool RestApiHierarchy::Handle(RestApi::DeleteCall& call,
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454 const UriComponents& uri)
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455 {
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456 RestApiPath::Components components;
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457 return LookupHandler(components, uri, DeleteCallback, 0, &call);
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458 }
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459
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460 }
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