From 513485c6c99c661470ebe4ffbff9d7109a13f015 Mon Sep 17 00:00:00 2001
From: Nelson Silva <nelson.silva@inevo.pt>
Date: Thu, 14 Feb 2013 16:01:59 +0000
Subject: [PATCH] Added JSON import

---
 src/node/handler/ImportHandler.js | 23 +++++++---
 src/node/utils/ImportJSON.js      | 74 +++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+), 6 deletions(-)
 create mode 100644 src/node/utils/ImportJSON.js

diff --git a/src/node/handler/ImportHandler.js b/src/node/handler/ImportHandler.js
index ac856a604..f45413aef 100644
--- a/src/node/handler/ImportHandler.js
+++ b/src/node/handler/ImportHandler.js
@@ -28,7 +28,8 @@ var ERR = require("async-stacktrace")
   , settings = require('../utils/Settings')
   , formidable = require('formidable')
   , os = require("os")
-  , importHtml = require("../utils/ImportHtml");
+  , importHtml = require("../utils/ImportHtml")
+  , importJSON = require("../utils/ImportJSON");
 
 //load abiword only if its enabled
 if(settings.abiword != null)
@@ -48,7 +49,9 @@ exports.doImport = function(req, res, padId)
   
   var srcFile, destFile
     , pad
-    , text;
+    , text
+    , fileEnding;
+
   
   async.series([
     //save the uploaded file to /tmp
@@ -72,11 +75,14 @@ exports.doImport = function(req, res, padId)
       });
     },
     
+    
+
     //ensure this is a file ending we know, else we change the file ending to .txt
     //this allows us to accept source code files like .c or .java
     function(callback) {
-      var fileEnding = path.extname(srcFile).toLowerCase()
-        , knownFileEndings = [".txt", ".doc", ".docx", ".pdf", ".odt", ".html", ".htm"]
+      fileEnding = path.extname(srcFile).toLowerCase();
+
+      var knownFileEndings = [".txt", ".doc", ".docx", ".pdf", ".odt", ".html", ".htm", ".json"]
         , fileEndingKnown = (knownFileEndings.indexOf(fileEnding) > -1);
       
       //if the file ending is known, continue as normal
@@ -95,9 +101,12 @@ exports.doImport = function(req, res, padId)
     //convert file to html
     function(callback) {
       var randNum = Math.floor(Math.random()*0xFFFFFFFF);
-      destFile = path.join(tmpDirectory, "eplite_import_" + randNum + ".htm");
+      destFile = path.join(tmpDirectory, "eplite_import_" + randNum + fileEnding);
 
-      if (abiword) {
+      // check if this format is supported by AbiWord
+      var isAbiWordSupported = (['json'].indexOf(fileEnding) == -1);
+
+      if (abiword && isAbiWordSupported) {
         abiword.convertFile(srcFile, destFile, "htm", function(err) {
           //catch convert errors
           if(err) {
@@ -143,6 +152,8 @@ exports.doImport = function(req, res, padId)
       var fileEnding = path.extname(srcFile).toLowerCase();
       if (abiword || fileEnding == ".htm" || fileEnding == ".html") {
         importHtml.setPadHTML(pad, text);
+      } else if (fileEnding == ".json") { 
+        importJSON.setPadJSON(pad, JSON.parse(text));
       } else {
         pad.setText(text);
       }
diff --git a/src/node/utils/ImportJSON.js b/src/node/utils/ImportJSON.js
new file mode 100644
index 000000000..99fc04b72
--- /dev/null
+++ b/src/node/utils/ImportJSON.js
@@ -0,0 +1,74 @@
+var log4js = require('log4js');
+var Changeset = require("ep_etherpad-lite/static/js/Changeset");
+
+function keepText(builder, text, from, to) {
+  var chars = to - from;
+  var keepText = text.substring(from, to);
+  var keepLines = keepText.split("\n").length - 1;
+  builder.keep(chars, keepLines);
+}
+
+function keepTextWithAttributes(builder, text, from, to, attributes, apool) {
+  var keepText = text.substring(from, to);
+  
+  var linePos = 0;
+  var length = keepText.length;
+  while (linePos < length) {
+    var lineEnd = keepText.indexOf('\n', linePos) + 1;
+    var lines;
+    if (lineEnd != 0) {
+      lines = 1;
+    } else {
+      lines = 0;
+      lineEnd = length;
+    }
+    var chars = lineEnd - linePos;
+
+    builder.keep(chars, lines, attributes, apool);
+
+    linePos += chars;
+  }
+}
+
+function setPadJSON(pad, json, callback) {
+  var apiLogger = log4js.getLogger("ImportHtml");
+
+  // Set the text
+  pad.setText(json.atext.text);
+
+  // Set the apoll
+  var nextNum = Math.max.apply(null, Object.keys(json.apool));
+  pad.apool().fromJsonable({numToAttrib:json.apool, nextNum:nextNum});
+  
+  var padText = pad.text();
+  var padTextLength = padText.length;
+
+  // split the text into lines
+  json.atext.attributes.forEach(function(att) {
+
+    // use a builder
+    var builder = Changeset.builder(padTextLength);
+
+    var from = parseInt(att.from);
+    var to = parseInt(att.to);
+
+    // Keep everything before "from"
+    if (from > 0) {
+      keepText(builder, padText, 0, from);
+    }
+
+    // Keep but add the attribute
+    keepTextWithAttributes(builder, padText, from, to, "*" + att.id, pad.apool());
+
+    // Keep everything after "to"
+    if (to < padTextLength) {
+      keepText(builder, padText, to, padTextLength);
+    }
+
+    // apply the revision
+    pad.appendRevision(builder.toString());
+  })
+
+}
+
+exports.setPadJSON = setPadJSON;