AKEF-Checkin (Arknights Endfield Auto Check-in)

Automated daily check-in script for Arknights Endfield (SKport). Built with TypeScript and Bun, runs via GitHub Actions automatically every day.

Features

• Serverless: Runs automatically every day using GitHub Actions.
• Self-refreshing Tokens: Uses a single long-lived ACCOUNT_TOKEN to generate fresh credentials on every run. No more manual token updates.
• Multi-Account Support: Supports checking in multiple accounts at once.
• Discord Notifications: Sends a daily result summary to your Discord server via Webhook.
• Reward Info: Reports the items and quantities received from each check-in.

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Setup (GitHub Actions — Recommended)

Step 1: Get Your ACCOUNT_TOKEN

Important

The ACCOUNT_TOKEN is not visible in the Application → Cookies tab. It lives on the Hypergryph auth server (as.gryphline.com) and must be found via the Network tab.

1. Open https://game.skport.com/endfield/sign-in in your browser while already logged in.
2. Press F12 to open DevTools and go to the Network tab.
3. Reload the page (F5) to capture network requests.
4. In the filter box at the top, type: grant
5. Click on the request to https://as.gryphline.com/user/oauth2/v2/grant
6. Click the Payload tab (not "Response" — Payload contains what was sent to the server).
7. You will see a JSON body like:

   {
     "token": "YOUR_ACCOUNT_TOKEN_IS_HERE",
     "appCode": "6eb76d4e13aa36e6",
     "type": 0
   }

8. Copy the value of "token" — that is your ACCOUNT_TOKEN.

This token is long-lived (weeks to months). The script automatically generates all other credentials (cred, signToken, gameRole) on every run, so you will rarely need to update it.

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Step 2: Push to GitHub

1. Create a new repository (Public or Private) on GitHub.
2. Push the contents of this folder to that repository.

Step 3: Add GitHub Secrets

1. In your repository, go to Settings → Secrets and variables → Actions.

2. Click New repository secret and add the following:

   Name	Value
   SKPORT_TOKENS	JSON array with your token (see format below)
   DISCORD_WEBHOOK_URL	(Optional) Your Discord webhook URL

   Format for SKPORT_TOKENS:

   [
     {
       "accountToken": "YOUR_ACCOUNT_TOKEN_HERE",
       "accountName": "Your Nickname",
       "language": "en"
     }
   ]

   For multiple accounts, add more objects to the array. Available languages: en, ja, zh_Hant, zh_Hans, ko, ru_RU

Step 4: Enable GitHub Actions

Go to the Actions tab in your repository and enable workflows. The script will run automatically every day at 16:00 UTC (Midnight WIB). You can also trigger it manually via Run workflow.

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Local Testing

1. Install Bun.
2. Copy .env.example to .env and fill in your ACCOUNT_TOKEN.
3. Run:

   bun run start

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How It Works

On each run, the script performs a full OAuth flow to generate fresh session credentials. This means no stored tokens ever go stale.

sequenceDiagram
    participant Script
    participant Gryphline as as.gryphline.com
    participant SKport as zonai.skport.com

    Script->>Gryphline: POST /user/oauth2/v2/grant<br/>(accountToken)
    Gryphline-->>Script: oauthCode (one-time)

    Script->>SKport: POST /user/auth/generate_cred_by_code<br/>(oauthCode)
    SKport-->>Script: cred (fresh session)

    Script->>SKport: GET /auth/refresh<br/>(cred)
    SKport-->>Script: signToken (signing key)

    Script->>SKport: GET /game/player/binding<br/>(cred + signed request)
    SKport-->>Script: gameRole (UID + server)

    Script->>SKport: POST /game/endfield/attendance<br/>(cred + gameRole + signed request)
    SKport-->>Script: ✅ Check-in result

Loading

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Acknowledgements

Thanks to the community for reverse-engineering the SKport API