express-ims-lti

This module provides a way to use the ims-lti module with Express. It is capable of detecting LTI login requests and intelligently restoring an LTI provider instance from an Express session automatically.

Usage

Usage for the module is fairly straightfoward.

var ltiMiddleware = require("express-ims-lti");

// ... Construct your application ...

app.use(ltiMiddleware({
  // You must use either the credentials option or the consumer_key and
  // consumer_secret. The credentials option a function that accepts a key and
  // a callback to perform an asynchronous operation to fetch the secret.
  credentials: function (key, callback) {
    // `this` is a reference to the request object.
    var consumer = this.consumer = fetchLtiConsumer(key);
    // The first parameter is an error (null if there is none).
    callback(null, key, consumer.secret);
  },

  consumer_key: "key",       // Required if not using credentials.
  consumer_secret: "secret", // Required if not using credentials.

  store: {                   // Optional.
    type: "redis",           // If store is omitted memory will be used.
    client: redisClient      // Required when using Redis.
  }
}));