--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/RestApi/RestApi.cpp	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,278 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "../PrecompiledHeaders.h"
+#include "RestApi.h"
+
+#include "../Logging.h"
+
+#include <stdlib.h>   // To define "_exit()" under Windows
+#include <stdio.h>
+
+namespace Orthanc
+{
+  namespace
+  {
+    // Anonymous namespace to avoid clashes between compilation modules
+    class HttpHandlerVisitor : public RestApiHierarchy::IVisitor
+    {
+    private:
+      RestApi& api_;
+      RestApiOutput& output_;
+      RequestOrigin origin_;
+      const char* remoteIp_;
+      const char* username_;
+      HttpMethod method_;
+      const IHttpHandler::Arguments& headers_;
+      const IHttpHandler::Arguments& getArguments_;
+      const void* bodyData_;
+      size_t bodySize_;
+
+    public:
+      HttpHandlerVisitor(RestApi& api,
+                         RestApiOutput& output,
+                         RequestOrigin origin,
+                         const char* remoteIp,
+                         const char* username,
+                         HttpMethod method,
+                         const IHttpHandler::Arguments& headers,
+                         const IHttpHandler::Arguments& getArguments,
+                         const void* bodyData,
+                         size_t bodySize) :
+        api_(api),
+        output_(output),
+        origin_(origin),
+        remoteIp_(remoteIp),
+        username_(username),
+        method_(method),
+        headers_(headers),
+        getArguments_(getArguments),
+        bodyData_(bodyData),
+        bodySize_(bodySize)
+      {
+      }
+
+      virtual bool Visit(const RestApiHierarchy::Resource& resource,
+                         const UriComponents& uri,
+                         const IHttpHandler::Arguments& components,
+                         const UriComponents& trailing)
+      {
+        if (resource.HasHandler(method_))
+        {
+          switch (method_)
+          {
+            case HttpMethod_Get:
+            {
+              RestApiGetCall call(output_, api_, origin_, remoteIp_, username_, 
+                                  headers_, components, trailing, uri, getArguments_);
+              resource.Handle(call);
+              return true;
+            }
+
+            case HttpMethod_Post:
+            {
+              RestApiPostCall call(output_, api_, origin_, remoteIp_, username_, 
+                                   headers_, components, trailing, uri, bodyData_, bodySize_);
+              resource.Handle(call);
+              return true;
+            }
+
+            case HttpMethod_Delete:
+            {
+              RestApiDeleteCall call(output_, api_, origin_, remoteIp_, username_, 
+                                     headers_, components, trailing, uri);
+              resource.Handle(call);
+              return true;
+            }
+
+            case HttpMethod_Put:
+            {
+              RestApiPutCall call(output_, api_, origin_, remoteIp_, username_, 
+                                  headers_, components, trailing, uri, bodyData_, bodySize_);
+              resource.Handle(call);
+              return true;
+            }
+
+            default:
+              return false;
+          }
+        }
+
+        return false;
+      }
+    };
+  }
+
+
+
+  static void AddMethod(std::string& target,
+                        const std::string& method)
+  {
+    if (target.size() > 0)
+      target += "," + method;
+    else
+      target = method;
+  }
+
+  static std::string  MethodsToString(const std::set<HttpMethod>& methods)
+  {
+    std::string s;
+
+    if (methods.find(HttpMethod_Get) != methods.end())
+    {
+      AddMethod(s, "GET");
+    }
+
+    if (methods.find(HttpMethod_Post) != methods.end())
+    {
+      AddMethod(s, "POST");
+    }
+
+    if (methods.find(HttpMethod_Put) != methods.end())
+    {
+      AddMethod(s, "PUT");
+    }
+
+    if (methods.find(HttpMethod_Delete) != methods.end())
+    {
+      AddMethod(s, "DELETE");
+    }
+
+    return s;
+  }
+
+
+
+  bool RestApi::Handle(HttpOutput& output,
+                       RequestOrigin origin,
+                       const char* remoteIp,
+                       const char* username,
+                       HttpMethod method,
+                       const UriComponents& uri,
+                       const Arguments& headers,
+                       const GetArguments& getArguments,
+                       const void* bodyData,
+                       size_t bodySize)
+  {
+    RestApiOutput wrappedOutput(output, method);
+
+#if ORTHANC_ENABLE_PUGIXML == 1
+    {
+      // Look if the client wishes XML answers instead of JSON
+      // http://www.w3.org/Protocols/HTTP/HTRQ_Headers.html#z3
+      Arguments::const_iterator it = headers.find("accept");
+      if (it != headers.end())
+      {
+        std::vector<std::string> accepted;
+        Toolbox::TokenizeString(accepted, it->second, ';');
+        for (size_t i = 0; i < accepted.size(); i++)
+        {
+          if (accepted[i] == MIME_XML)
+          {
+            wrappedOutput.SetConvertJsonToXml(true);
+          }
+
+          if (accepted[i] == MIME_JSON)
+          {
+            wrappedOutput.SetConvertJsonToXml(false);
+          }
+        }
+      }
+    }
+#endif
+
+    Arguments compiled;
+    HttpToolbox::CompileGetArguments(compiled, getArguments);
+
+    HttpHandlerVisitor visitor(*this, wrappedOutput, origin, remoteIp, username, 
+                               method, headers, compiled, bodyData, bodySize);
+
+    if (root_.LookupResource(uri, visitor))
+    {
+      wrappedOutput.Finalize();
+      return true;
+    }
+
+    std::set<HttpMethod> methods;
+    root_.GetAcceptedMethods(methods, uri);
+
+    if (methods.empty())
+    {
+      return false;  // This URI is not served by this REST API
+    }
+    else
+    {
+      LOG(INFO) << "REST method " << EnumerationToString(method) 
+                << " not allowed on: " << Toolbox::FlattenUri(uri);
+
+      output.SendMethodNotAllowed(MethodsToString(methods));
+
+      return true;
+    }
+  }
+
+  void RestApi::Register(const std::string& path,
+                         RestApiGetCall::Handler handler)
+  {
+    root_.Register(path, handler);
+  }
+
+  void RestApi::Register(const std::string& path,
+                         RestApiPutCall::Handler handler)
+  {
+    root_.Register(path, handler);
+  }
+
+  void RestApi::Register(const std::string& path,
+                         RestApiPostCall::Handler handler)
+  {
+    root_.Register(path, handler);
+  }
+
+  void RestApi::Register(const std::string& path,
+                         RestApiDeleteCall::Handler handler)
+  {
+    root_.Register(path, handler);
+  }
+  
+  void RestApi::AutoListChildren(RestApiGetCall& call)
+  {
+    RestApi& context = call.GetContext();
+
+    Json::Value directory;
+    if (context.root_.GetDirectory(directory, call.GetFullUri()))
+    {
+      call.GetOutput().AnswerJson(directory);
+    }    
+  }
+}