Added JSON export

src/node/handler/ExportHandler.js

@@ -21,6 +21,7 @@
 var ERR = require("async-stacktrace");
 var exporthtml = require("../utils/ExportHtml");
 var exportdokuwiki = require("../utils/ExportDokuWiki");
+var exportjson = require("../utils/ExportJSON");
 var padManager = require("../db/PadManager");
 var async = require("async");
 var fs = require("fs");
@@ -65,6 +66,16 @@ exports.doExport = function(req, res, padId, type)
       }
     });
   }
+  else if(type == "json")
+  {
+    padManager.getPad(padId, function(err, pad)
+    {
+      ERR(err);
+      exportjson.getPadJSON(pad, req.params.rev, function(err, json) {
+        res.send(json);
+      })
+    });
+  }
   else if(type == 'dokuwiki')
   {
     var randNum;

src/node/hooks/express/importexport.js

@@ -5,7 +5,7 @@ var importHandler = require('../../handler/ImportHandler');
 
 exports.expressCreateServer = function (hook_name, args, cb) {
   args.app.get('/p/:pad/:rev?/export/:type', function(req, res, next) {
-    var types = ["pdf", "doc", "txt", "html", "odt", "dokuwiki"];
+    var types = ["pdf", "doc", "txt", "html", "odt", "dokuwiki", "json"];
     //send a 404 if we don't support this filetype
     if (types.indexOf(req.params.type) == -1) {
       next();

src/node/utils/ExportJSON.js

@@ -0,0 +1,41 @@
+var Changeset = require("ep_etherpad-lite/static/js/Changeset");
+var ERR = require("async-stacktrace");
+
+function getJSONAttributes(attribs) {
+  var pos = 0;
+  var iter = Changeset.opIterator(attribs);
+  var attr = [];
+  while (iter.hasNext()) {
+    var op = iter.next();
+    Changeset.eachAttribNumber(op.attribs, function (a){
+      attr.push({id: a, from:pos, to: pos + op.chars});
+    });
+    pos += op.chars;
+  }
+  return attr;
+}
+
+function getPadJSON(pad, rev, callback) {
+
+  //check parameters
+  if(!pad || !pad.id || !pad.atext || !pad.pool) {
+    throw new Error('Invalid pad');
+  }
+
+  if (!rev) {
+    rev = pad.getHeadRevisionNumber();
+  } else {
+    rev = parseInt(rev, 10);
+    if(rev < 0 || rev > pad.getHeadRevisionNumber()) {
+      throw new Error('Invalid start revision ' + fromRev);
+    }
+  }
+
+  pad.getInternalRevisionAText(rev, function (err, atext) {
+    if(ERR(err, callback)) return;
+    attributes = getJSONAttributes(atext.attribs);
+    callback(null, {apool: pad.apool().numToAttrib, atext: { attributes: attributes, text: atext.text}});
+  });
+}
+
+exports.getPadJSON = getPadJSON;