Provide API to select a file on mobile

code/smartphone.js

@@ -176,3 +176,18 @@ window.useAndroidPanes = function() {
   return (typeof android !== 'undefined' && android && android.addPane && window.isSmartphone());
 }
 
+if(typeof android !== 'undefined' && android && android.getFileRequestUrlPrefix) {
+  window.requestFile = function(callback) {
+    do {
+      var funcName = "onFileSelected" + parseInt(Math.random()*0xFFFF).toString(16);
+    } while(window[funcName] !== undefined)
+
+    window[funcName] = function(filename, content) {
+      callback(decodeURIComponent(filename), atob(content));
+    };
+    var script = document.createElement('script');
+    script.src = android.getFileRequestUrlPrefix() + funcName;
+    (document.body || document.head || document.documentElement).appendChild(script);
+  };
+}
+

mobile/src/com/cradle/iitc_mobile/IITC_FileManager.java

@@ -1,11 +1,19 @@
 package com.cradle.iitc_mobile;
 
+import android.app.Activity;
+import android.content.ActivityNotFoundException;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.AssetManager;
 import android.net.Uri;
 import android.os.Environment;
 import android.preference.PreferenceManager;
+import android.util.Base64;
+import android.util.Base64OutputStream;
 import android.webkit.WebResourceResponse;
+import android.widget.Toast;
+
+import com.cradle.iitc_mobile.IITC_Mobile.ResponseHandler;
 
 import org.json.JSONObject;
 
@@ -16,7 +24,10 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.PipedInputStream;
+import java.io.PipedOutputStream;
 import java.net.URL;
+import java.net.URLEncoder;
 import java.util.HashMap;
 
 public class IITC_FileManager {
@@ -112,6 +123,10 @@ public class IITC_FileManager {
         return mAssetManager.open(filename);
     }
 
+    private WebResourceResponse getFileRequest(Uri uri) {
+        return new FileRequest(uri);
+    }
+
     private WebResourceResponse getScript(Uri uri) {
         InputStream stream;
         try {
@@ -179,6 +194,10 @@ public class IITC_FileManager {
         return os.toString();
     }
 
+    public String getFileRequestPrefix() {
+        return "//file-request" + DOMAIN + "/";
+    }
+
     public String getIITCVersion() throws IOException {
         InputStream stream = getAssetFile("total-conversion-build.user.js");
 
@@ -196,8 +215,76 @@ public class IITC_FileManager {
             return getScript(uri);
         if ("user-plugin".equals(host))
             return getUserPlugin(uri);
+        if ("file-request".equals(host))
+            return getFileRequest(uri);
 
         Log.e("could not generate response for url: " + uri);
         return EMPTY;
     }
+
+    private class FileRequest extends WebResourceResponse implements ResponseHandler {
+        private PipedOutputStream mStreamOut;
+        private String mFunctionName;
+
+        private FileRequest(Uri uri) {
+            super("application/x-javascript", "UTF-8", new PipedInputStream());
+
+            try {
+                mStreamOut = new PipedOutputStream((PipedInputStream) getData());
+            } catch (IOException e) {
+                Log.w(e);
+            }
+
+            mFunctionName = uri.getPathSegments().get(0);
+
+            final Intent target = new Intent(Intent.ACTION_GET_CONTENT);
+            target.setType("file/*");
+            target.addCategory(Intent.CATEGORY_OPENABLE);
+
+            // Create the chooser Intent
+            Intent intent = Intent.createChooser(target, "Choose file");
+            try {
+                mIitc.startActivityForResult(intent, this);
+            } catch (ActivityNotFoundException e) {
+                Toast.makeText(mIitc, "No activity to select a file found." +
+                        "Please install a file browser of your choice!", Toast.LENGTH_LONG).show();
+            }
+        }
+
+        @Override
+        public void onActivityResult(int resultCode, Intent data) {
+            try {
+                if (resultCode == Activity.RESULT_OK && data != null) {
+                    Uri uri = data.getData();
+                    File file = new File(uri.getPath());
+
+                    mStreamOut.write(
+                            (mFunctionName + "('" + URLEncoder.encode(file.getName(), "UTF-8") + "', '").getBytes());
+
+                    Base64OutputStream encoder =
+                            new Base64OutputStream(mStreamOut, Base64.NO_CLOSE | Base64.NO_WRAP | Base64.DEFAULT);
+
+                    FileInputStream fileinput = new FileInputStream(file);
+                    int c;
+                    while ((c = fileinput.read()) != -1)
+                    {
+                        encoder.write(c);
+                    }
+                    encoder.close();
+                    
+                    mStreamOut.write("');".getBytes());
+                }
+
+                mStreamOut.close();
+            } catch (IOException e) {
+                Log.w(e);
+
+                // try to close stream, but ignore errors
+                try {
+                    mStreamOut.close();
+                } catch (IOException e1) {
+                }
+            }
+        }
+    }
 }

mobile/src/com/cradle/iitc_mobile/IITC_JSInterface.java

@@ -224,4 +224,9 @@ public class IITC_JSInterface {
             }
         });
     }
+
+    @JavascriptInterface
+    public String getFileRequestUrlPrefix() {
+        return mIitc.getFileManager().getFileRequestPrefix();
+    }
 }