How to create .txt on a local file system using the Firefox extension

Question

I am currently working on the ffsniff extension code. In this, I must save the data containing the password information to a file on my local system. I wrote my code, but it does not even create a file on my local system. (works in Mozilla firefox)

Here is my code, please help me.

//// here data variable contains all the information var fso = new ActiveXObject("Scripting.FileSystemObject"); varFileObject = fso.OpenTextFile("C:\\logs.txt", 2, true,0); varFileObject.write(data); varFileObject.close(); 

after that I tried another code:

 Components.utils.import("resource://gre/modules/NetUtil.jsm"); Components.utils.import("resource://gre/modules/FileUtils.jsm"); var file = Components.classes["@mozilla.org/file/directory_service;1"]. getService(Components.interfaces.nsIProperties). get("Desk", Components.interfaces.nsIFile); file.append("logs.txt"); var ostream = FileUtils.openSafeFileOutputStream(file) var converter = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]. createInstance(Components.interfaces.nsIScriptableUnicodeConverter); converter.charset = "UTF-8"; var istream = converter.convertToInputStream(data); } }); 

but none of them work.

Answer 1

This is a solution to create a file in ubuntu, hope this helps others:

  var file = Components.classes["@mozilla.org/file/directory_service;1"]. getService(Components.interfaces.nsIProperties). get("ProfD", Components.interfaces.nsIFile); file.append("trick_new"); if( !file.exists() || !file.isDirectory() ) { // if it doesn't exist, create file.create(Components.interfaces.nsIFile.DIRECTORY_TYPE, 0777); } this.log_file=file.path+"/newlog.html"; 

Answer 2

Here is a working snippet that, if necessary, creates a destination directory and writes (overwrites) to a file (in this case d: \ temp-directory \ temp-file.txt):

 var {Cc,Ci,Cu}=require("chrome"); //for jetpack sdk. Cu.import("resource://gre/modules/NetUtil.jsm"); Cu.import("resource://gre/modules/FileUtils.jsm"); var localFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile); var data="test file content"; //localFile.initWithPath("D:\\temp-directory\\temp-file.txt"); //full path is okay if directory exists localFile.initWithPath("D:\\temp-directory\\"); //otherwise specifiy directory, create it if necessary, and append leaf. if(!localFile.exists()){ localFile.create(localFile.DIRECTORY_TYPE,FileUtils.PERMS_DIRECTORY); } localFile.append("temp-file.txt"); //localFile.createUnique(localFile.NORMAL_FILE_TYPE,FileUtils.PERMS_FILE); //optional: create a new unique file. asyncSave(localFile,data,onDone); function asyncSave(file,data,callbackDone){ // file is nsIFile, data is a string, optional: callbackDone(path,leafName,statusCode) // default flags: FileUtils.openSafeFileOutputStream(file, FileUtils.MODE_WRONLY | FileUtils.MODE_CREATE | FileUtils.MODE_TRUNCATE); var ostream = FileUtils.openSafeFileOutputStream(file); var converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"].createInstance(Ci.nsIScriptableUnicodeConverter); converter.charset = "UTF-8"; var istream = converter.convertToInputStream(data); // optional: callbackSaved(status). NetUtil.asyncCopy(istream, ostream, callbackSaved); function callbackSaved (status) { if(callbackDone){ if(status===0)callbackDone( file.path, file.leafName, status); //sucess. else callbackDone( null, null, status); //failure. }; } } function onDone(path,leafName,statusCode){ console.log([statusCode===0?"OK":"error",path,leafName].join("\n")); } 

Additional Information:

• https://developer.mozilla.org/en-US/docs/Code_snippets/File_I_O
• https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/FileUtils.jsm
  • https://developer.mozilla.org/en-US/docs/PR_Open
• https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/NetUtil.jsm
• https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIFile
• https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsILocalFile

Answer 3

A simple example of how to read / write a file from a file system in Windows using the Firefox extension

  // Write File to filesystem Components.utils.import("resource://gre/modules/osfile.jsm"); // load the OS module var encoder = new TextEncoder(); // This encoder can be reused for several writes var array = encoder.encode("just some text"); // Convert the text to an array var promise = OS.File.writeAtomic("C:\\foo.txt", array,{tmpPath: "foo.txt.tmp"}); // Write the array atomically to "file.txt", using as temporary alert("URL HOST has been saved"); //Read File from filesystem var decoder = new TextDecoder(); // This decoder can be reused for several reads var promise = OS.File.read("C:\\foo.txt"); // Read the complete file as an array promise = promise.then( function onSuccess(array) { alert(decoder.decode(array)); // Convert this array to a text } ); 

Answer 4

You can also use a text stream to write to a local file.

 function writeTextToFile(text, filename) { var fileIO = require("sdk/io/file"); var TextWriter = fileIO.open(filename, "w"); if (!TextWriter.closed) { TextWriter.write(text); TextWriter.close(); } }