Allow custom resource versions from user specific folder

README.md

@@ -5,6 +5,11 @@ A [web browser extension](https://decentraleyes.org) that emulates Content Deliv
 
 > **Note:** Decentraleyes is no silver bullet, but it does prevent a lot of websites from making you send these kinds of requests. Ultimately, you can make Decentraleyes block requests for any missing CDN resources, too.
 
+## Custom Resources
+
+You can set a folder path to a custom resource folder in Addon options menu. Place your versions of supported resources, complying with the scheme of bundled resources (without .dec extension). See resources.js paths for currently supported resources and file names.
+Example: [YourFolder]/resources/jquery/3.2.1/jquery.min.js
+
 ## Roadmap
 
 Now that there's a solid, Mozilla approved, foundation, it's time to move forward. Mobility, extensibility (through support for community-powered resource packages), and usability, will be the main points of attention during this phase.

lib/data-handler.js

@@ -19,22 +19,18 @@
 
 var { Cc, Ci } = require('chrome');
 var self = require('sdk/self');
+var fileIO = require("sdk/io/file");
 
 //noinspection JSUnresolvedFunction
 var ioService = Cc['@mozilla.org/network/io-service;1']
     .getService(Ci.nsIIOService);
 
-/**
- * Absolute resource file paths.
- * @var {object} files
- */
-var files = require('./files');
-
 /**
  * Constants
  */
 
 const DELIVERY_NOTICE = '/**\n * Local delivery by Decentraleyes (' + self.version + ').\n */\n\n';
+const PATH_SEP		  = require('sdk/fs/path').sep;	
 
 /**
  * Variables
@@ -46,17 +42,39 @@ var resourceData = self.data;
  * Public Methods
  */
 
-function getRedirectionURI(targetPath, characterSet, type) {
-
-    var data, dataURI, redirectionURI;
-
-    data = _loadResource(targetPath);
-    dataURI = _buildDataURI(type, characterSet, data);
-    redirectionURI = ioService.newURI(dataURI, null, null);
-
+function getRedirectionURI(targetPath, characterSet, type, userDir) {    
+    var data, dataURI, redirectionURI;    
+    var invalidationChar = false;        
+
+    data = _loadUserResource(targetPath, userDir);   //First, attempt to load from User Resource Dir    
+    if (data == "")    {        
+        data = _loadResource(targetPath);  //After, check bundled Resources        
+        invalidationChar = true;    
+    }    
+    dataURI = _buildDataURI(type, characterSet, data, invalidationChar);    
+    redirectionURI = ioService.newURI(dataURI, null, null);        
     return redirectionURI;
 }
 
+function _loadUserResource(targetPath, userDir){	
+    if (!userDir || userDir == "") return "";	
+    if (!userDir.endsWith("/") && !userDir.endsWith("\\"))		
+        userDir += PATH_SEP;	
+    var userTargetPath = userDir + targetPath.substring(0, targetPath.length-4);	
+    userTargetPath = userTargetPath.replace(/\//g, PATH_SEP).replace(/\\/g, PATH_SEP);		
+    var text = "";	
+    try {		
+        if (fileIO.exists(userTargetPath)) {			
+            var file = fileIO.open(userTargetPath, "r");			
+            if (!file.closed) {				
+                text = file.read();				
+                file.close();			
+            }		
+        }	
+    }	catch (e) {}	
+    return text;
+}
+
 /**
  * Exports
  */
@@ -71,25 +89,26 @@ function _loadResource(targetPath) {
 
     var resource;
 
-    // Find the result inside a static path index.
-    if (!files[targetPath]) {
-        throw new Error('The requested resource is missing.');
-    }
-
-    // Attempt to load resource contents.
-    return resource = resourceData.load(targetPath);
+    try {        
+        resource = resourceData.load(targetPath);    
+    }    
+    catch (e) {        
+        throw new Error('The requested resource is missing.');    
+    }        
+    return resource;
 }
 
-function _buildDataURI(type, characterSet, data) {
+function _buildDataURI(type, characterSet, data, stripfirst) {
 
     var addNotice, dataURI;
 
     //noinspection JSUnresolvedVariable
     addNotice = require('sdk/simple-prefs').prefs.addNotice;
     dataURI = 'data:' + type + ';charset=' + characterSet + ',';
 
-    // Remove the syntax invalidation character.
-    data = data.substring(1);
+    // Remove the syntax invalidation character for bundled resources.    
+    if (stripfirst)        
+        data = data.substring(1);
 
     if (!addNotice) {
         dataURI = dataURI + encodeURIComponent(data);

lib/interceptor.js

@@ -97,7 +97,7 @@ var Interceptor = new Class({
 
         // Fetch local data and create a redirection URI.
         try {
-            redirectionURI = dataHandler.getRedirectionURI(target.path, characterSet, target.type);
+            redirectionURI = dataHandler.getRedirectionURI(target.path, characterSet, target.type, preferences.userContentDir);
         } catch (exception) {
             return this.handleMissingCandidate(httpChannel);
         }