Utilize Selenium to grant XPCOM access and achieve file writing capabilities using Javascript within Firefox

Question

Utilize Selenium to grant XPCOM access and achieve file writing capabilities using Javascript within Firefox

Below is an example demonstrating how to request XPCOM access from Javascript:

How to create a file using javascript in Mozilla Firefox

 netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");

I am interested in finding a way to enable XPCOM access for my Selenium test scripts, allowing Javascript to directly write raw image data to a file. This poses a follow-up question on how to extract pixel data efficiently:

Firefox, Selenium, toDataURL, Uint8ClampedArray and Python

My objectives are as follows:

Enable XPCOM access for Javascript executed through Selenium
Render images on a Canvas element
Retrieve canvas pixels as raw image data (with a public API available on the canvas itself)
Write raw image data to a file using XPCOM interfaces at a specified location

Please note: Encoding such as PNG is not suitable. The raw data format is preferred for efficiency, as it will be directly used for video encoding purposes.

javascript file firefox selenium xpcom

Answer 1

Answer №1

Looking for a solution? This blog post might have what you need:

Save to local files with XPCOM for Selenium Firefox Chrome

function saveFile(fileName, val){
   try {
      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
   } catch (e) {
      //alert("Permission to save file was denied.");
   }
   var file = Components.classes["@mozilla.org/file/local;1"]
             .createInstance(Components.interfaces.nsILocalFile);
   file.initWithPath(fileName);
   if (file.exists() == false) {
     //alert("Creating file... " );
     file.create( Components.interfaces.nsIFile.NORMAL_FILE_TYPE, 420 );
   }
   var outputStream = Components.classes["@mozilla.org/network/file-output-stream;1"]
            .createInstance(Components.interfaces.nsIFileOutputStream);
   outputStream.init( file, 0x04 | 0x08 | 0x20, 420, 0 ); 
   //UTF-8 convert
   var uc = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]
     .createInstance(Components.interfaces.nsIScriptableUnicodeConverter);
   uc.charset = "UTF-8";
   var data_stream = uc.ConvertFromUnicode(val);
   var result = outputStream.write(data_stream, data_stream.length );
   outputStream.close(); 
}

You may need to customize it for your specific case (RAW datatype), but this should give you a good starting point!

Answer 2

Looking for a solution? This blog post might have what you need:

Save to local files with XPCOM for Selenium Firefox Chrome

function saveFile(fileName, val){
   try {
      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
   } catch (e) {
      //alert("Permission to save file was denied.");
   }
   var file = Components.classes["@mozilla.org/file/local;1"]
             .createInstance(Components.interfaces.nsILocalFile);
   file.initWithPath(fileName);
   if (file.exists() == false) {
     //alert("Creating file... " );
     file.create( Components.interfaces.nsIFile.NORMAL_FILE_TYPE, 420 );
   }
   var outputStream = Components.classes["@mozilla.org/network/file-output-stream;1"]
            .createInstance(Components.interfaces.nsIFileOutputStream);
   outputStream.init( file, 0x04 | 0x08 | 0x20, 420, 0 ); 
   //UTF-8 convert
   var uc = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]
     .createInstance(Components.interfaces.nsIScriptableUnicodeConverter);
   uc.charset = "UTF-8";
   var data_stream = uc.ConvertFromUnicode(val);
   var result = outputStream.write(data_stream, data_stream.length );
   outputStream.close(); 
}

You may need to customize it for your specific case (RAW datatype), but this should give you a good starting point!

Answer 3

Answer №2

While my knowledge of Selenium is limited, there may be an opportunity to add an extension to Firefox before it launches the page. This could allow for injecting your customized script into the loaded page. Take a look at this useful information on SO answer

Answer 4

While my knowledge of Selenium is limited, there may be an opportunity to add an extension to Firefox before it launches the page. This could allow for injecting your customized script into the loaded page. Take a look at this useful information on SO answer

Utilize Selenium to grant XPCOM access and achieve file writing capabilities using Javascript within Firefox

Answer №1

Answer №2

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