Meta Rewrite Proxy (for Node.js)

The Meta Rewrite Proxy module is used to stream an existing URL and adjust the meta [tag] data. It allows you to leverage the existing data without creating redundant pages. Rules can be created that will add new meta tags, remove unnecessary meta tags, and modify existing metas based on regex or functional definitions.

Install as dependency

Install the module:

npm install meta-rewrite-proxy

...or...

Add to your package.json file:

{
  "name":        "my-app",
  // ...
  "dependencies": {
    // ...
    "meta-rewrite-proxy": "0.0.1"
  }
}

Define your meta rewrite configuration

Require the module:

var proxy = require("meta-rewrite-proxy");

Set the hostname for the domain you would like to proxy:

proxy.set("hostname", "www.my-other-app.com");

Add rewrite rules for the meta tags:

proxy.set("rw_rules", {
  "og:type": "my_app_namespace:my_object",
  "og:title": function( old_title ) {
    return old_title.replace(" - My App", "");
  },
  "fb:app_id": process.env.FACEBOOK_APP_ID,
  "og:url": function( old_url ) {
    return old_url.replace("www.my-other-app.com/", "www.my-new-app.com/proxy/");
  }
});

Using the route method with Express

This is the simplest way to leverage the module. It will setup an Express route on /proxy/. For example: www.my-new-app.com/proxy/user/profile/me.html will return www.my-other-app.com/user/profile/me.html with the meta rules applied.

proxy.route(app, "/proxy/");

Using the fetch method

The same as the route example, but explicitly defined.

app.get(/\/proxy\/(.*)$/, function(request, response) {
  proxy.fetch("/" + request.params[0], function( html ) {
    response.write(html);
    response.end();
  });
});

License

* Copyright (c) 2011 Jacob Swartwood
* Licensed under the MIT license
* http://jacob.swartwood.info/license/