# APK Signing Implementation - Complete Summary

**Status**: ✅ Implementation Complete | 🟡 Secrets Configuration Pending

**Last Updated**: 2024

---

## 📋 What Was Implemented

### 1. GitHub Actions Workflow Updates

**File**: `.github/workflows/product-release.yml`

**New Steps Added**:
1. **🔐 Setup APK Signing** (before build)
   - Detects app (worker/client) and environment (dev/stage/prod)
   - Decodes keystore from GitHub Secrets
   - Sets CodeMagic-compatible environment variables
   - Configures `CI=true` for build.gradle.kts detection
   - Gracefully handles missing secrets with warnings

2. **✅ Verify APK Signature** (after build)
   - Verifies APK is properly signed using `jarsigner`
   - Displays certificate details
   - Shows signer information
   - Provides helpful warnings if unsigned

**How It Works**:
```yaml
Setup Signing:
  - Reads: ${{ secrets.WORKER_KEYSTORE_DEV_BASE64 }}
  - Decodes to: /tmp/keystores/release.jks
  - Sets env: CI=true, CM_KEYSTORE_PATH_STAFF=/tmp/keystores/release.jks

Build APK:
  - Runs: make mobile-staff-build PLATFORM=apk MODE=release
  - build.gradle.kts detects CI=true
  - Uses environment variables for signing

Verify Signature:
  - Checks with: jarsigner -verify app-release.apk
  - Displays certificate info
```

### 2. Documentation Created

**Files Created**:

| File | Purpose | Lines |
|------|---------|-------|
| [docs/RELEASE/APK_SIGNING_SETUP.md](../../docs/RELEASE/APK_SIGNING_SETUP.md) | Complete setup guide | 300+ |
| [docs/RELEASE/GITHUB_SECRETS_CHECKLIST.md](../../docs/RELEASE/GITHUB_SECRETS_CHECKLIST.md) | Quick reference checklist | 120+ |
| [.github/scripts/setup-github-secrets.sh](../../.github/scripts/setup-github-secrets.sh) | Helper script | 200+ |

### 3. Scripts Created

**File**: `.github/scripts/setup-github-secrets.sh`

**Purpose**: Interactive helper to:
- Show which secrets are needed
- Generate base64 from existing keystores
- Display keytool information
- Provide copy-paste commands

**Usage**:
```bash
./.github/scripts/setup-github-secrets.sh
```

---

## 🔑 GitHub Secrets Required

**Total: 24 Secrets** (6 keystores × 4 properties each)

### Secret Naming Pattern:
```
{APP}_KEYSTORE_{ENV}_BASE64
{APP}_KEYSTORE_PASSWORD_{ENV}
{APP}_KEY_ALIAS_{ENV}
{APP}_KEY_PASSWORD_{ENV}
```

Where:
- `{APP}` = `WORKER` or `CLIENT`
- `{ENV}` = `DEV`, `STAGING`, or `PROD`

### Full List:

**Worker Mobile (12 secrets)**:
- `WORKER_KEYSTORE_DEV_BASE64`, `WORKER_KEYSTORE_PASSWORD_DEV`, `WORKER_KEY_ALIAS_DEV`, `WORKER_KEY_PASSWORD_DEV`
- `WORKER_KEYSTORE_STAGING_BASE64`, `WORKER_KEYSTORE_PASSWORD_STAGING`, `WORKER_KEY_ALIAS_STAGING`, `WORKER_KEY_PASSWORD_STAGING`
- `WORKER_KEYSTORE_PROD_BASE64`, `WORKER_KEYSTORE_PASSWORD_PROD`, `WORKER_KEY_ALIAS_PROD`, `WORKER_KEY_PASSWORD_PROD`

**Client Mobile (12 secrets)**:
- `CLIENT_KEYSTORE_DEV_BASE64`, `CLIENT_KEYSTORE_PASSWORD_DEV`, `CLIENT_KEY_ALIAS_DEV`, `CLIENT_KEY_PASSWORD_DEV`
- `CLIENT_KEYSTORE_STAGING_BASE64`, `CLIENT_KEYSTORE_PASSWORD_STAGING`, `CLIENT_KEY_ALIAS_STAGING`, `CLIENT_KEY_PASSWORD_STAGING`
- `CLIENT_KEYSTORE_PROD_BASE64`, `CLIENT_KEYSTORE_PASSWORD_PROD`, `CLIENT_KEY_ALIAS_PROD`, `CLIENT_KEY_PASSWORD_PROD`

---

## 🚀 How to Configure

### Step 1: Prepare Dev Keystores

Dev keystores are already in the repository:
- Worker: `apps/mobile/apps/staff/android/app/krow_with_us_staff_dev.jks`
- Client: `apps/mobile/apps/client/android/app/krow_with_us_client_dev.jks`

Generate base64:
```bash
# Worker Dev
base64 -i apps/mobile/apps/staff/android/app/krow_with_us_staff_dev.jks

# Client Dev  
base64 -i apps/mobile/apps/client/android/app/krow_with_us_client_dev.jks
```

### Step 2: Retrieve Staging/Prod Keystores

**Option A**: From CodeMagic
1. Go to CodeMagic → Team Settings → Code signing identities
2. Download keystores: `krow_staff_staging.jks`, `krow_staff_prod.jks`, etc.
3. Generate base64 for each

**Option B**: From Secure Storage
1. Retrieve from your organization's key management system
2. Generate base64 for each

### Step 3: Add to GitHub

1. Go to: **Repository → Settings → Secrets and variables → Actions**
2. Click: **New repository secret**
3. Add all 24 secrets (use checklist: [GITHUB_SECRETS_CHECKLIST.md](../../docs/RELEASE/GITHUB_SECRETS_CHECKLIST.md))

### Step 4: Test the Workflow

```bash
# Test with dev environment first
# Go to: Actions → Product Release → Run workflow
# Select:
#   - App: worker-mobile-app
#   - Environment: dev
#   - Version type: patch
#   - Create GitHub Release: true
```

**Expected Output**:
```
🔐 Setting up Android signing for worker-mobile-app in dev environment...
✅ Keystore decoded successfully
📦 Keystore size: 3.2K
✅ Signing environment configured for STAFF (dev environment)
🔑 Using key alias: krow_staff_dev

📱 Building Staff (Worker) APK...
✅ APK built successfully

🔍 Verifying APK signature...
✅ APK is properly signed!
📜 Certificate Details: [shows cert info]
```

---

## 🔒 Security Considerations

### ✅ Safe Practices

1. **Dev keystores in repo**: Acceptable for development
   - Committed: `krow_with_us_staff_dev.jks`, `krow_with_us_client_dev.jks`
   - Password: `krowwithus` (public knowledge)

2. **Staging/Prod keystores**: ONLY in GitHub Secrets
   - Never commit to repository
   - Encrypted at rest by GitHub
   - Only accessible in workflow runs

3. **Keystore cleanup**: Workflow stores in `${{ runner.temp }}`
   - Automatically deleted after job completes
   - Not persisted in artifacts or logs

### ⚠️ Important Notes

1. **Same keystores as CodeMagic**: Use identical keystores to ensure app updates work
2. **Signature consistency**: Apps signed with different keystores cannot update each other
3. **Key rotation**: Document process for rotating production keys
4. **Backup keystores**: Keep secure backups - lost keystores = can't update app

---

## 🧪 Testing Checklist

Before using in production:

- [ ] Configure all 24 GitHub Secrets
- [ ] Run workflow with `dev` environment
- [ ] Download APK artifact
- [ ] Verify signature: `jarsigner -verify -verbose app.apk`
- [ ] Install APK on Android device
- [ ] Launch app and verify functionality
- [ ] Compare signature fingerprints with CodeMagic builds
- [ ] Test `stage` environment
- [ ] Test `prod` environment (after full validation)

---

## 📊 Architecture Overview

```
┌─────────────────────────────────────────────────────────────┐
│ GitHub Actions Workflow: product-release.yml               │
├─────────────────────────────────────────────────────────────┤
│                                                             │
│  1. Validate & Create Release                               │
│     └─> Extract version from pubspec.yaml                  │
│     └─> Create Git tag                                      │
│     └─> Create GitHub Release                               │
│                                                             │
│  2. Build Mobile Artifacts                                  │
│     │                                                       │
│     ├─> Setup Node.js + Firebase CLI                       │
│     ├─> Setup Java 17                                       │
│     ├─> Setup Flutter 3.24.5                                │
│     ├─> Install Melos                                       │
│     ├─> Install Dependencies                                │
│     │                                                       │
│     ├─> 🔐 Setup APK Signing (NEW)                         │
│     │   ├─> Detect app (worker/client)                     │
│     │   ├─> Detect environment (dev/stage/prod)            │
│     │   ├─> Read GitHub Secret:                            │
│     │   │   {APP}_KEYSTORE_{ENV}_BASE64                    │
│     │   ├─> Decode base64 → .jks file                      │
│     │   ├─> Set environment variables:                     │
│     │   │   - CI=true                                      │
│     │   │   - CM_KEYSTORE_PATH_STAFF=/tmp/keystore.jks    │
│     │   │   - CM_KEYSTORE_PASSWORD_STAFF=***              │
│     │   │   - CM_KEY_ALIAS_STAFF=krow_staff_dev           │
│     │   │   - CM_KEY_PASSWORD_STAFF=***                   │
│     │   └─> ✅ Ready for signed build                      │
│     │                                                       │
│     ├─> 🏗️ Build APK                                       │
│     │   └─> make mobile-staff-build PLATFORM=apk          │
│     │       └─> Flutter build detects CI=true              │
│     │           └─> build.gradle.kts uses env vars         │
│     │               └─> Signs APK with keystore            │
│     │                                                       │
│     ├─> ✅ Verify APK Signature (NEW)                      │
│     │   ├─> jarsigner -verify app-release.apk             │
│     │   ├─> Show certificate details                       │
│     │   └─> Confirm signing successful                     │
│     │                                                       │
│     ├─> 📤 Upload APK as Artifact                          │
│     │   └─> 30-day retention in GitHub Actions            │
│     │                                                       │
│     └─> 📦 Attach APK to GitHub Release                    │
│         └─> krow-withus-worker-mobile-dev-v0.1.0.apk      │
│                                                             │
└─────────────────────────────────────────────────────────────┘

┌─────────────────────────────────────────────────────────────┐
│ Build Configuration: build.gradle.kts                       │
├─────────────────────────────────────────────────────────────┤
│                                                             │
│  signingConfigs {                                           │
│      create("release") {                                    │
│          if (System.getenv()["CI"] == "true") {            │
│              // ✅ GitHub Actions / CodeMagic              │
│              storeFile = file(                              │
│                  System.getenv()["CM_KEYSTORE_PATH_STAFF"] │
│              )                                              │
│              storePassword =                                │
│                  System.getenv()["CM_KEYSTORE_PASSWORD_*"] │
│              keyAlias =                                     │
│                  System.getenv()["CM_KEY_ALIAS_*"]        │
│              keyPassword =                                  │
│                  System.getenv()["CM_KEY_PASSWORD_*"]     │
│          } else {                                           │
│              // Local Development                           │
│              use key.properties file                        │
│          }                                                  │
│      }                                                      │
│  }                                                          │
│                                                             │
└─────────────────────────────────────────────────────────────┘
```

---

## 📖 Documentation Index

1. **[APK_SIGNING_SETUP.md](../../docs/RELEASE/APK_SIGNING_SETUP.md)**
   - Complete setup guide with all details
   - Security best practices
   - Troubleshooting guide
   - Keystore management commands

2. **[GITHUB_SECRETS_CHECKLIST.md](../../docs/RELEASE/GITHUB_SECRETS_CHECKLIST.md)**
   - Quick reference for all 24 secrets
   - Copy-paste checklist
   - Dev environment values

3. **[setup-mobile-github-secrets.sh](../../.github/scripts/setup-mobile-github-secrets.sh)**
   - Interactive helper script
   - Shows existing keystores
   - Generates base64 commands
   - Displays keytool info

4. **[product-release.yml](../../.github/workflows/product-release.yml)**
   - Updated workflow with signing
   - Lines 198-294: Setup APK Signing
   - Lines 330-364: Verify APK Signature

---

## ✅ Next Steps

### Immediate (Required for Signed APKs)
1. **Configure GitHub Secrets** (30 minutes)
   - Start with dev environment (test first)
   - Use helper script: `.github/scripts/setup-mobile-github-secrets.sh`
   - Follow checklist: `docs/RELEASE/GITHUB_SECRETS_CHECKLIST.md`

2. **Test Dev Signing** (15 minutes)
   - Run workflow with dev environment
   - Download APK and verify signature
   - Install on device and test

3. **Configure Staging/Prod** (30 minutes)
   - Retrieve keystores from CodeMagic/secure storage
   - Add to GitHub Secrets
   - Test each environment

### Future Enhancements (Optional)
- [ ] Add AAB (Android App Bundle) support for Play Store
- [ ] Implement iOS signing for IPA files
- [ ] Add automated Play Store upload
- [ ] Set up GitHub Environments with protection rules
- [ ] Add Slack notifications for releases

---

## 🆘 Support

If you encounter issues:

1. Check workflow logs for signing step output
2. Verify GitHub Secrets are configured correctly
3. Run helper script: `.github/scripts/setup-mobile-github-secrets.sh`
4. Review: `docs/RELEASE/APK_SIGNING_SETUP.md` → Troubleshooting section

**Common Issues**:
- "Keystore not found" → Secret not configured or wrong name
- "Wrong password" → Secret value doesn't match actual keystore
- APK unsigned → CI=true not set or build.gradle.kts issue
- App won't install over existing → Different keystore used

---

**Implementation Date**: 2024  
**Implemented By**: GitHub Copilot (Claude Sonnet 4.5)  
**Status**: ✅ Code Complete | 🟡 Awaiting Secrets Configuration
