Get Recent Tweets using Twitter REST API v1.1 by ColdFusion - Part 2

Let's start where we left in Part 1. In this post our main Goal will be to create Dynamic Oath Header for authorizing  an API request. We already created Oath Header using shamApp Application and get our latest tweet but this is not our permanent solution .

To create Oath Header we need
1. Oath Settings - which we created using Twitter Application
2. Time Stamp  - when we create our oath request.
3. Oath Nonce - create using 32 byte random alphanumeric characters.
4. Oath Signature - create using HMAC-SHA1 encryption with Signing Key and Signature Based String (Secret Message).
5. Oath Creation - using above 4
6. HTTP request to User Time Line API to get latest Tweets.

Declare your Oath Settings values first:

Now  Create Time Stamp and Oath nonce:
Note: We can also create Timestamp using now() function too but I suggest you to first convert into GMT format time and then to epoch time.


Now lets move to create Signing Key and Signing base string(Message)  using Percent Encoding which will be used to create Oath Signature using HMAC-SHA1 Encryption.

So our Signature Key and Signature base string(secret message) is ready. Lets pass these two to our function  called HmacSHA1 encryption to get Oath Signature.
"There is no MAC function Included in CF 9 but CF 10 provides HMAC function to achieve this. So Let's do it in CF 9 using  MAC and Secret Key class provided by JAVA to achieve it"


So our Final step is to create Oath Header and send this Oath Header via HTTP request to User Timeline API to get our latest tweet post.

This HTTP request will give our recent tweeter posts along with lots of details associated with it in JSON format. 
To see our Twitter post we have to first deserialise this JSON response.

So we get our final o/p of latest Tweets posted by user. So now you can display latest tweet in web pages. This is same result which we got from shamApp application in part1

Goal Achieved :)

Useful Links:

https://apigee.com/console/twitter (Major API console to debug )

http://quonos.nl/oauthTester/ (Signature Testing for Twitter)

https://dev.twitter.com/docs/auth/authorizing-request (Twitter Oath request)

https://dev.twitter.com/docs/auth/creating-signature(Create Signature)

http://en.wikipedia.org/wiki/Hash-based_message_authentication_code(HMAC wiki)

http://docs.oracle.com/javase/7/docs/api/javax/crypto/Mac.html (mac class provided by JAVA)
http://docs.oracle.com/javase/7/docs/api/javax/crypto/spec/SecretKeySpec.html (secretkey class provided by JAVA)

Hope it will help you.
Happy Tweet :)