Installed API infrastructure, getText works already

node/handler/APIHandler.js

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+/**
+ * The API Handler handles all API http requests
+ */
+
+/*
+ * 2011 Peter 'Pita' Martischka
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+var fs = require("fs");
+var api = require("../db/API");
+
+//ensure we have an apikey
+var apikey = null;
+try
+{
+  apikey = fs.readFileSync("../APIKEY.txt","utf8");
+}
+catch(e) 
+{
+  apikey = randomString(32);
+  fs.writeFileSync("../APIKEY.txt",apikey,"utf8");
+}
+
+//a list of all functions
+var functions = {
+//  "createGroup"               : [],
+//  "getMappedGroup4"           : ["groupMapper"], 
+//  "deleteGroup"               : ["groupID"], 
+//  "listPads"                  : ["groupID"], 
+//  "createPad"                 : ["groupID", "padName", "text"], 
+//  "createAuthor"              : ["name"], 
+//  "getMappedAuthor4"          : ["authorMapper" , "name"], 
+//  "createSession"             : ["groupID", "authorID", "validUntil"], 
+//  "deleteSession"             : ["sessionID"], 
+//  "getSessionInfo"            : ["sessionID"], 
+//  "listSessionsOfGroup"       : ["groupID"], 
+//  "listSessionsOfAuthor"      : ["authorID"], 
+//  "deleteAllSessionsOfGroup"  : ["groupID"], 
+//  "deleteAllSessionsOfAuthor" : ["authorID"], 
+  "getText"                   : ["padID", "rev"]
+//  "setText"                   : ["padID", "text"]
+//  "getRevisionsCount"         : ["padID"], 
+//  "deletePad"                 : ["padID"], 
+//  "getReadOnlyLink"           : ["padID"], 
+//  "setPublicStatus"           : ["padID", "publicStatus"], 
+//  "getPublicStatus"           : ["padID"], 
+//  "setPassword"               : ["padID", "password"], 
+//  "isPasswordProtected"       : ["padID"]
+};
+
+/**
+ * Handles a HTTP API call
+ * @param functionName the name of the called function
+ * @param fields the params of the called function
+ * @req express request object
+ * @res express response object
+ */
+exports.handle = function(functionName, fields, req, res)
+{
+  //check the api key!
+  if(fields["apikey"] != apikey)
+  {
+    res.send({code: 4, message: "no or wrong API Key", data: null});
+    return;
+  }
+  
+  //check if this is a valid function name
+  var isKnownFunctionname = false;
+  for(var knownFunctionname in functions)
+  {
+    if(knownFunctionname == functionName)
+    {
+      isKnownFunctionname = true;
+      break;
+    }
+  }
+  
+  //say goodbye if this is a unkown function
+  if(!isKnownFunctionname)
+  {
+    res.send({code: 3, message: "no such function", data: null});
+    return;
+  }
+  
+  //put the function parameters in an array
+  var functionParams = [];
+  for(var i=0;i<functions[functionName].length;i++)
+  {
+    functionParams.push(fields[functions[functionName][i]]);
+  }
+  
+  //add a callback function to handle the response
+  functionParams.push(function(err, data)
+  {  
+    // no error happend, everything is fine
+    if(err == null)
+    {
+      res.send({code: 0, message: null, data: data});
+    }
+    // parameters were wrong and the api stopped execution, pass the error
+    else if(err.stop)
+    {
+      res.send({code: 1, message: err.stop, data: null});
+    }
+    //an unkown error happend
+    else
+    {
+      res.send({code: 2, message: "internal error", data: null});
+      throw (err);
+    }
+  });
+  
+  //call the api function
+  api[functionName](functionParams[0],functionParams[1],functionParams[2],functionParams[3],functionParams[4]);
+}
+
+/**
+ * Generates a random String with the given length. Is needed to generate the Author Ids
+ */
+function randomString(len) {
+  // use only numbers and lowercase letters
+  var pieces = [];
+  for(var i=0;i<len;i++) {
+    pieces.push(Math.floor(Math.random()*36).toString(36).slice(-1));
+  }
+  return pieces.join('');
+}