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Setup Google OAuth Desktop App

Panduan visual step-by-step buat dapetin file credentials.json yang dibutuhkan gsm. Estimasi waktu: 15-30 menit (sekali setup, gak diulang).

Kenapa butuh ini?

gsm perlu akses Google Workspace lo (buat add domain, bikin user, verify ownership). Itu butuh file OAuth credentials yang lo download dari Google Cloud Console.

Step 1: Buka Google Cloud Console

Buka: https://console.cloud.google.com

Login pakai akun Google Workspace Admin lo (yang punya akses Admin SDK).

Penting: Akun ini harus admin Workspace, bukan akun Gmail biasa. Kalo lo gak yakin, cek di https://admin.google.com - kalo bisa login, lo admin.

Step 2: Bikin Project Baru

  1. Klik dropdown project di pojok kiri-atas (di samping "Google Cloud" logo)
  2. Di popup yang muncul, klik tombol "NEW PROJECT" (kanan-atas)
  3. Isi:
    • Project name: gsuite-manager (atau nama bebas)
    • Organization: pilih organization Workspace lo
    • Location: biarin default
  4. Klik "CREATE"
  5. Tunggu beberapa detik, lalu pilih project itu di dropdown atas

Step 3: Enable 2 API yang Dibutuhkan

gsm butuh 2 API:

  • Admin SDK API (buat manage domain + user)
  • Site Verification API (buat verify ownership domain)

Cara enable:

  1. Di sidebar kiri, klik "APIs & Services" → "Library"
  2. Search: Admin SDK API
  3. Klik hasilnya, lalu klik tombol "ENABLE" (tunggu sampe selesai)
  4. Balik ke Library, search: Site Verification API
  5. Klik hasilnya, klik "ENABLE"

Kalo udah pernah enable, tombolnya bakal jadi "MANAGE" (artinya udah aktif - skip).

Step 4: Setup OAuth Consent Screen

Sebelum bisa bikin OAuth client, harus setup consent screen dulu.

  1. Sidebar: "APIs & Services" → "OAuth consent screen"
  2. Pilih User Type:
    • Internal kalo lo punya Workspace organization (RECOMMENDED - lebih simpel)
    • External kalo gak punya org / pakai Gmail biasa (perlu approval Google)
  3. Klik "CREATE"
  4. Isi form:
    • App name: gsuite-manager (atau bebas)
    • User support email: email Workspace lo
    • Developer contact: email Workspace lo
    • Field lain: bisa di-skip
  5. Klik "SAVE AND CONTINUE"
  6. Di Scopes page: klik "SAVE AND CONTINUE" (gak perlu add scope di sini, scope diatur di code)
  7. Di Test users page (kalo External): tambahin email lo, klik "SAVE AND CONTINUE"
  8. Klik "BACK TO DASHBOARD"

Step 5: Bikin OAuth Client ID

Ini step inti yang ngehasilin credentials.json.

  1. Sidebar: "APIs & Services" → "Credentials"
  2. Klik "+ CREATE CREDENTIALS" (tombol biru di atas)
  3. Pilih "OAuth client ID"
  4. Di form:
    • Application type: pilih "Desktop app" (PENTING! Bukan Web!)
    • Name: gsuite-manager-cli (atau bebas)
  5. Klik "CREATE"
  6. Popup muncul dengan Client ID dan Client Secret
  7. Klik "DOWNLOAD JSON" (tombol di kanan-bawah popup)

Step 6: Simpen File ke Project

File yang lo download namanya kayak: client_secret_123456789-abcdef.apps.googleusercontent.com.json

Pindahin ke folder project:

# Misal lo download ke ~/Downloads
mv ~/Downloads/client_secret_*.json ./credentials.json

# Atau tetep nama aslinya - gsm auto-detect
mv ~/Downloads/client_secret_*.json ./

Verify:

gsm doctor

Cek di output: oauth_client row harus PASS.

Step 7: First Auth (Browser Login)

Pertama kali run command yang butuh Google API (mis. gsm domains add), browser bakal kebuka otomatis:

  1. Login pake akun Workspace Admin lo
  2. WARNING screen: "Google hasn't verified this app" → klik "Advanced" → "Go to gsuite-manager (unsafe)"
    • Ini muncul karena app lo Internal/Test - aman, ini app lo sendiri
  3. Setujui semua scope yang diminta:
    • Site Verification
    • Admin Directory (Domain + User)
  4. Setelah selesai, browser nampilin "The authentication flow has completed"
  5. Token otomatis disimpen di token.json - gak perlu login lagi sampai 7 hari atau token revoked.

Troubleshooting

"App isn't verified" - ada tombol Advanced gak?

Kalo consent screen tipe External dan App belum di-publish, hanya test users yang bisa login.

Fix: balik ke OAuth consent screen → tab Test users → tambahin email lo.

"Access denied" - permission_denied

Akun yang lo pake login bukan Workspace Admin.

Fix: Login pake akun yang punya akses ke https://admin.google.com.

"redirect_uri_mismatch"

Lo bikin OAuth client tipe "Web" instead of "Desktop app".

Fix: Bikin OAuth client baru, pilih Desktop app (Step 5).

token.json expired / kena revoke

rm token.json
gsm doctor   # akan re-auth via browser

Security Notes

  • credentials.json = identitas app lo. Jangan commit ke git! (sudah di-block di .gitignore)
  • token.json = akses ke Workspace lo. Jangan share! (juga di-block)
  • Kalo credentials.json ke-leak: revoke di Google Cloud Console → bikin client baru
  • Kalo token.json ke-leak: balik ke OAuth consent screen → di tab "Credentials" → revoke session
  • Mode 0o600 (owner-read-only) di-enforce sama gsm

Quick Checklist

  • GCP project bikin
  • Admin SDK API enabled
  • Site Verification API enabled
  • OAuth consent screen configured
  • OAuth client tipe Desktop app dibikin
  • JSON downloaded → renamed credentials.json → di project root
  • gsm doctor → oauth_client PASS
  • First command run → browser kebuka → login OK → token.json ter-create

Kalo semua ✓, lo siap pake gsm domains add dan gsm users add.