Content extension implementation

[Tape]

I'm just opening this PR for right now, but here's the base code for the content extension. I will be writing tests for it but I just wanted to go ahead and put this up here for now as I am currently stuck and can't for the life of me figure out a bug.

[Tape]

So oddly enough after this line an extension persists across all UNIQUE Provider objects that I create for testing. Here's a small test class I had set up, ContentExtension.coffee. For some reason the 2nd test case fails because it is referencing data from the first unrelated provider object? Maybe you have more insight @omsmith?

lti = require '../'


describe 'LTI.Extensions.Content', () ->
  describe 'Initialization', () ->
    it 'should initialize an object if ext_content_return_types is set', () ->
      provider = new lti.Provider 'key', 'secret'

      req =
        body:
          ext_content_return_types: 'file,iframe'

      provider.parse_request req
      provider.ext_content.should.exist

    it 'should be false if ext_content_return_types is missing', () ->
      provider = new lti.Provider 'key', 'secret'

      req = { body: {} }

      provider.parse_request req
      provider.ext_content.should.equal false

[omsmith]

Existing issue, it seems. Gross.

From c9dc4a939c3de7b703c6088ae902615cee98cb94 Mon Sep 17 00:00:00 2001
From: Owen Smith <owen@omsmith.ca>
Date: Tue, 6 Jan 2015 08:36:11 -0500
Subject: [PATCH 1/1] foo

---
 src/provider.coffee | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/provider.coffee b/src/provider.coffee
index 545a941..9d470fc 100644
--- a/src/provider.coffee
+++ b/src/provider.coffee
@@ -8,9 +8,6 @@ extensions        = require './extensions'

 class Provider

-  # Used as accessor to request parameters
-  body: {}
-
   constructor: (consumer_key, consumer_secret, nonceStore, signature_method=(new HMAC_SHA1()) ) ->

     if typeof consumer_key is 'undefined' or consumer_key is null
@@ -30,6 +27,8 @@ class Provider
     @signer           = signature_method
     @nonceStore       = nonceStore

+    @body = {}
+

   # Verify parameter and OAuth signature by passing the request object
   # Returns true/false if is valid
-- 
2.1.0

[Tape]

You are a lifesaver, I couldn't figure out what was going on for the life of me, thanks. I didn't even think to look in the object prototype. I'll finish up stuff when I get the time.