Wake Up Playlist Generator

Client Authorization

Client has to use full swap service as described below.

Method	url	Description
GET	/swap	Will be called during Spotify login process. Registers or updates tokens for spotify user. This will also start generation of user’s music graph.
GET	/refresh	Will be called by API when access token becomes invalid. Sometimes it will refresh user’s music graph but this will happen in the background.

When client is succesfully logged in and spotify session is created (see Android/iOS SDKs), it may start using API as described below. To succesfully access API methods Authorization header must be present. The header consists of refresh_token<space>access_token for example:

Authorization: OSUflWFG9Ikhj2PBuJkR/A== BQC_quTfn9pi06ZogXlp62-qLDUSbQ0-0bRKpDVPTmY_FVLi0kLiWiDe1Rz3g85uV3_8fahXDj_auVdV7fCBNEhvKL99Le118C5SwNOx9_85c5bQEvEm-QZ-rEXWOX3z-tvbYJqAhoxgOLpZ5zdjf8FwuJ4661-e-cBDuyLDgP8MZFYoVV6HcyY-M9bJd-bwnNLSXQRBQx0IZEeMiDyD5H0_4BM-iIln6cnYW-M9GwX2dN-z

You can obtain refresh and access tokens in your session object (see SDK). Please note that refresh_token is an server encrypted value

Few additional remarks:

1. User needs premium account to use this sleep app. Free account will not give you access to play lists and streaming
2. See later on configuring Spotify App, without it you will not login
3. Refresh spotify sessions as described in SDK
4. Please provide correct spotify scope during login, please find current scope in /sleep_server/api/config.py

playlist-read-private playlist-read-collaborative playlist-modify-private user-follow-read user-library-read user-read-private user-top-read

Api Methods

There are two playlist types in the API

1. fall_asleep will be played when user wants to sleep
2. wake_up will be played when user wants to wake up

All correct responses are returned with 20x HTTP status code and have following general JSON format

{result: <content> }

Method	url	Description
GET	/me/playlists	Get wake up and fall asleep playlist properties
POST	/me/playlists/:playlist_type	Create/update given playlist. Should be called before playlist is accessible with GET. Calling this method will regenerate playlist content.

####/me/playlists This method takes no parameters. Returns list of playlist objects with following properties

1. uri spotify uri of the playlist. Use this to play music
2. length playlist actual length. This will be as close to desired length as possible
3. type (wake_up, fall_asleep) For new users we use default desired length of 30 minutes

Example

curl -X GET "http://sleepapi.dev.army/me/playlists" -H "Authorization: ...."
{
  "result": [
    {
      "length": 2203530,
      "type": "fall_asleep",
      "uri": "spotify:user:rudolfix-us:playlist:191jgxBblZ8dOAI1zis5Th"
    },
    {
      "length": 4787650,
      "type": "wake_up",
      "uri": "spotify:user:rudolfix-us:playlist:2jHR9oCmXl1wFc3o6EDqH3"
    }
  ]
}

Special HTTP status codes:

1. 428: user data is not processed and playlist cannot be generated. it typically take from 15 to 2 minutes. currently (demo) this is a random time

####/me/playlists/:playlist_type Input parameters

:playlist_type tells which plalist to set up ( wake_up | fall_asleep). Mandatory parameter Query string parameters desired_length - desired playlist length in milliseconds. Please note that actual playlist length will be different as it is consturcted with the whole tracks. Mandatory parameter. Returns Playlist object

curl -X POST "http://sleepapi.dev.army/me/playlists/wake_up?desired_length=30000" -H "Authorization: ...."
{
  "result": {
    "length": 415379,
    "type": "wake_up",
    "uri": "spotify:user:rudolfix-us:playlist:2jHR9oCmXl1wFc3o6EDqH3"
  }
}

Special HTTP error codes:

1. 428: user data is not processed and playlist cannot be generated. it typically take from 15 to 2 minutes. currently (demo) this is a random time

Example Api Session

1. Execute spotify login. It will end by calling /swap on the server. Swap method will create empty user account, generate access token and encrypted refresh token that must be used for authorization. Swap method will start generation of the user’s music graph which is later used to construct playlists. Swap method will set desired length for user's playlists to 30 minutes
2. Swap method will fail for free spotify users. You can always re-login later.
3. You can use GET /me/playlists/ to check if music graph is ready.
4. When graph is ready, playlists with default length will be created on first GET
5. At this point playlists are ready and will be always available.
6. When graph is ready, client may set playlist length for both playlist types with POST. Playlist content will be re-created even if length is not changed

Error Handling

###Api Service

Same HTTP status codes should be handled in the same way.

status code	description
400	Bad Request. Parameters to request are invalid. See body for details.
401	Unauthorized. Access to service denied. You must re-login user with swap service to recover See body for details
403	Fobidden. Client will not be serverd no matter what. See body for details
428	Precondition Needed. See /me/playlist method
500	Internal Server error. Try again later ;>

{
  "error": {
    "code": "PlaylistIncorrectDesiredLength",
    "message": "Playlists length can be from 0 to 4800000, actual value is 30000000",
    "status": 400
  }
}

Please note that body format is compatible with Spotify API error responses See /sleep_server/api/exceptions for possible codes (they are exception class names)

###Swap Service Swap service transparently returns Spotify status codes and error messages. Check what will happen in case of free spotify user, 403 will be returned

Spotify App Configuration

Wakeup Playlist Generator spotify app with client id 3547ee3842f24500aded0f5a0afe11a5 is used both for dev and prod environments (todo: create separate app for prod env.) This app must be configured properly to allow mobile clients to login

1. Register iOS/Android bundle (like sleep.luxury8.com) (https://developer.spotify.com/technologies/spotify-ios-sdk/)
2. Set up a auth callback with app url scheme (https://developer.spotify.com/technologies/spotify-ios-sdk/tutorial/)
3. Exactly the same callback must be set on the backend (/sleep_server/api/config.py:CLIENT_CALLBACK_URL. Spotify checks if both match.

Deployment Information

• API and Swap Service are deployed on http://sleepapi.dev.army. (AWS/Frankfurt/Micro)
• There is admin/test service accessible on http://sleepapi.dev.army/admin/dashboard. After login you'll see your Authorization header you may use to test with curl

Notes On Mockup

Mockup works like final service, except playlists are not smartly generated. Currently there are two template playlists

1. https://open.spotify.com/user/1130122659/playlist/1v1Do2ukgKZ64wCuOrBnug (wake up)
2. https://open.spotify.com/user/1130122659/playlist/4rk4vb5hjM2jC5HFaOKRAL (fall asleep)

(Sarnecka is the owner) Playlist content is copied and then truncated to desired length. Finally it is stored in current user Spotify account and available for playback I've found out that some songs available in DE for Aga are not available in PL for me, possible huge fuckup with playback length - some songs will be skipped

Development Environment

Vagrant up in root folder & add 127.0.0.1 dev.wakeupapp.com on host machine, vagrant slave is fully provisioned