Repo for all spotify server side lamdas

This repo contains lambda code for oauth transactions with Spotify's API

Config

Using AWS lambda and AWS API gateway to achieve token generation and refresh. For more info about token swap and refresh see Spotify's documentation
Using NodeJS 10.x
Axios to make HTTP request to spotify

How to use

I'm currently running the token swap in one lambda and refresh token in another lambda function. The only difference between the two are the data payload for the requests. I can easily combine into one lambda but for the sake of clarity and my sanity i'm keeping them separate.

To use this code base(Same instruction for refresh and token swap)

Clone project
Go into the spotify-refresh-token-lambda or the spotify-api-token-lambda folder, whichever you want to do first.
Make sure you have node v10.x. Use NVM to make your life easier. Run

npm install

You're ready to push your code to AWS lambda. I use node-lambda to upload my code. You can also do this in the console. Peep this instruction from Amazon. Please read the Things to note section below to help the setup go smoother.
Add the three environment variables(SPOTIFY_CLIENT_ID, SPOTIFY_CLIENT_SECRET, SPOTIFY_CLIENT_CALLBACK_URL) to your lambda function. Set them to the values from your App Dashboard.
Do this instruction set for the other lambda.

API Gateway

It get's a little tricky here. You're using this gateway to point to your lambdas. If you're unfamiliar I'll recommend reading AWS's documentation

Create an API
Create two resources. I created /api/token for the token swap and /api/refresh_token for token refresh
For each one, point them to it's respective lambda and create a POST method
Set the mapping template for the Integration Request on each resource to the below. My content-type is set to application/x-www-form-urlencoded

{
    "data": {
        #foreach( $token in $input.path('$').split('&') )
            #set( $keyVal = $token.split('=') )
            #set( $keyValSize = $keyVal.size() )
            #if( $keyValSize >= 1 )
                #set( $key = $util.urlDecode($keyVal[0]) )
                #if( $keyValSize >= 2 )
                    #set( $val = $util.urlDecode($keyVal[1]) )
                #else
                    #set( $val = '' )
                #end
                "$key": "$val"#if($foreach.hasNext),#end
            #end
        #end
    }
}

I highly recommend this article if you've never worked with API gateways and lambdas. It has screenshots.

VERY IMPORTANT

Keep in mind that for the token swap, the lambda is expecting a key, "code" with its value being the authorization code you get from the auth modal or spotify app. For the refresh token, keep in mind that you need to pass in a key "refresh_token" with its value being the refresh token. Set content type to application/x-www-form-urlencoded. These keys and values are specified in the Spotify token swap and refresh token documentation.

Things to note:

You'll want create a role for lambda that has access to API Gateway and CloudWatch Logs.
Make sure to include the node_modules folder in your lambda.

adoxner/spotify-token-lambdas

Repo for all spotify server side lamdas

Config

How to use

API Gateway