PencilBlue Router Framework & Request Pipeline

cors.js

/**
 * An example of adding middleware.  
 * It injects code into the request pipeline that adds a header to allows resources from the server to be accessed by other domains.
 */
class CorsPlugin {
  
  static onStartupWithContext (context, cb) {
    
    var middlewareName = 'addCorsHeader';
    var middleware = {
      name: middlewareName,
      action: MinifyPlugin.addCorsHeader
    };
    var result = pb.Router.addMiddlewareBefore('checkPublicRoute', middleware);
    cb(!result ? new Error('Failed to add middleware') : null);
  }
    
  static addCorsHeader (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', '*');
  }
}

minify.js

/**
 * An example of replacing middleware.  
 * It injects code into the request pipeline that will minify JS before being written to the response stream
 */
class MinifyPlugin {
  
  static onStartupWithContext (context, cb) {
    
    var middlewareName = 'writeResponse';
    var middleware = {
      name: middlewareName,
      action: MinifyPlugin.writeResponseWithMinification
    };
    var result = pb.Router.replaceMiddleware(middlewareName, middleware);
    cb(!result ? new Error('Failed to override middleware') : null);
  }
    
  static writeResponseWithMinification (req, res, next) {
    var data = req.controllerResult;
    if (data.content_type === 'text/javascript' && !!data.content) {
      data.content = UglifyJS.minify(data.content, {fromString: true});
    }
    pb.Middleware.writeResponse(req, res, next);
  }
}

performance.js

/**
 * An example of removing middleware.  
 * It removes the middleware that writes the request result to the console
 */
class PerformancePlugin {
  
  static onStartupWithContext (context, cb) {
    
    var middlewareName = 'responseTime';
    var result = pb.Router.removeMiddleware(middlewareName);
    cb(!result ? new Error('Failed to remove middleware') : null);
  }
}