Very basic proof of concept.

config.xml

<?xml version='1.0' encoding='utf-8'?>
<widget id="io.cordova.hellocordova" version="0.0.1" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
    <!-- ... -->
    
    <feature name="Manifest">
        <param name="android-package" value="io.cordova.hellocordova.ManifestPlugin" />
        <param name="onload" value="true" />
    </feature>
    
    <!-- ... -->
    
    <content src="https://dpogue.ca/index.html" />
</widget>

ManifestPlugin.java

package io.cordova.hellocordova;

import android.net.Uri;
import org.apache.cordova.*;

public class ManifestPlugin extends CordovaPlugin {
    private static final String LOG_TAG = "ManifestPlugin";
    private static final String SCOPE = "https://dpogue.ca/";

    @Override
    public Uri remapUri(Uri uri) {
        if (!uri.toString().startsWith(SCOPE)) {
            return null;
        }

        LOG.d(LOG_TAG, "Remapping URI: " + uri.toString());

        String remapped = uri.toString().replace(SCOPE, "file:///android_asset/www/");
        return Uri.parse(remapped);
    }

    @Override
    public Boolean shouldAllowRequest(String url) {
        if (url.startsWith(SCOPE)) {
            return true;
        }

        return null;
    }

    @Override
    public Boolean shouldAllowNavigation(String url) {
        if (url.startsWith(SCOPE)) {
            return true;
        }

        return null;
    }
}

Hey Dpogue,

I've tried using your gist to load a service worker from file:/// with a fresh Cordova application and a local plugin with your ManifestPlugin.java. The plugin is correctly mapping the external https:// URI to the file:/// protocol, but the service workers still fails to register.

The error I receive is quite general:

The Service Worker security policy prevented an action

Can you shed some light on this?

Manuel

Hi Manuel, I see you never got an answer but did you ever successfully jerry-rig a service worker?