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PROGRESS.md - Android Google Drive Sync Library

Track completed items, milestones, and achievements

Project Initialization

2026-01-13 - Project Setup

  • Created project directory android-google-drive-sync
  • Initialized Git repository
  • Created AGENTS.md with comprehensive development guidelines
    • Defined project overview and key goals
    • Specified technology stack (Kotlin, Coroutines, Hilt, WorkManager)
    • Documented Clean Architecture layers
    • Defined module structure with detailed file organization
    • Specified core components (GoogleSyncClient, SyncConfiguration, SyncResult)
    • Documented sync algorithm (upload, download, bidirectional)
    • Defined conflict resolution strategies
    • Specified error handling and resilience patterns
    • Documented background sync with WorkManager
    • Defined testing requirements and code quality standards
  • Created TODO.md with phased task breakdown
    • Phase 1: Project Setup
    • Phase 2: Core Infrastructure (auth, drive, local)
    • Phase 3: Sync Engine
    • Phase 4: Resilience & Background Sync
    • Phase 5: Public API
    • Phase 6: Persistence (optional)
    • Phase 7: Sample App
    • Phase 8: Documentation & Polish
    • Future Enhancements
  • Created PROGRESS.md for tracking completed work
  • Created README.md with quick start guide and usage examples
  • Created .gitignore with comprehensive rules
  • Created Gradle project structure
    • settings.gradle.kts with library and sample modules
    • build.gradle.kts with detekt configuration
    • gradle.properties with optimized settings
    • gradle/libs.versions.toml with version catalog
  • Created library module
    • build.gradle.kts with dependencies and publishing config
    • AndroidManifest.xml with required permissions
    • Directory structure for all packages (api, auth, sync, drive, local, cache, worker, resilience, db, di, util)
    • consumer-rules.pro for library consumers
    • proguard-rules.pro for release builds
  • Created sample app module
    • build.gradle.kts with Compose dependencies
    • AndroidManifest.xml with app configuration
    • SampleApplication.kt with Hilt setup
    • MainActivity.kt with placeholder UI
    • strings.xml and themes.xml resources
  • Created docs directory
    • INTEGRATION.md with setup instructions
    • CONFIGURATION.md with detailed options reference
    • TROUBLESHOOTING.md with common issues and solutions
  • Created detekt.yml for code quality configuration

2026-01-13 - Phase 2: Core Infrastructure Implementation

Authentication Module (auth/)

  • Implemented AuthState sealed class with states: NotSignedIn, SigningIn, SignedIn, Error, PermissionRequired
  • Implemented AuthResult sealed class for auth operations
  • Implemented AuthConfig data class for configurable auth options
  • Implemented GoogleAuthManager with:
    • Google Sign-In integration
    • OAuth2 token management
    • Observable auth state via StateFlow
    • Sign-out and revoke access support
    • Drive service creation

Drive Operations Module (drive/)

  • Implemented DriveModels:
    • DriveFile - File metadata with checksum support
    • DriveFolder - Folder metadata
    • DriveBackupFile - Backup file metadata
    • DriveOperationResult<T> - Type-safe sealed result class
    • UploadResult, DownloadResult - Operation results
    • FileListQuery, FileListPage - Pagination support
    • FolderCache - Folder ID caching
  • Implemented DriveFileOperations:
    • Upload file (create/update)
    • Download file
    • Delete file
    • List files with pagination
    • Find file by name
    • Get file metadata
  • Implemented DriveFolderManager:
    • Create folder
    • Find folder by name
    • Find or create folder
    • Ensure sync folder structure
    • Ensure nested folder paths
    • List subfolders
    • Delete folder
  • Implemented DriveService as high-level coordinator:
    • Automatic auth handling
    • Lazy Drive service creation
    • Folder structure management
    • File and backup operations

Local File Module (local/)

  • Implemented ChecksumAlgorithm enum (MD5, SHA256)
  • Implemented FileHasher:
    • Calculate hash for files, streams, and byte arrays
    • Verify checksums
    • Create/parse hashed filenames
  • Implemented FileFilter sealed class:
    • Extension filtering (include/exclude)
    • Size filtering (min/max)
    • Glob pattern matching
    • Regex pattern matching
    • Hidden file filtering
    • Path prefix filtering
    • Custom predicates
    • Composite filters (and/or)
    • Default sync filter
  • Implemented LocalFileInfo data class
  • Implemented LocalFileManager:
    • List files recursively
    • List files with checksums
    • Get file info
    • Ensure directories
    • Copy, read, write files
    • Delete files/directories
    • Create temp files/directories
    • Get directory size/count
    • Clean old files

Resilience Module (resilience/)

  • Implemented RetryPolicy:
    • Configurable max attempts, delays, backoff
    • Default, aggressive, minimal, none presets
    • Custom retry predicates
    • Rate limit handling
  • Implemented withRetry() suspend function
  • Implemented NetworkMonitor:
    • Real-time network state observation
    • Network policy checking (ANY, UNMETERED_ONLY, WIFI_ONLY, NOT_ROAMING)
    • Wait for network Flow
  • Implemented SyncProgress data class
  • Implemented SyncPhase enum
  • Implemented SyncProgressManager:
    • Progress tracking via StateFlow
    • File-level progress updates
    • Progress persistence for resume
    • Database checksum caching
    • Last sync timestamp tracking

Dependency Injection (di/)

  • Implemented GoogleSyncModule Hilt module with all singleton dependencies

2026-01-13 - Phase 3-5: Sync Engine, Worker, API, Cache Implementation

Sync Module (sync/)

  • Implemented SyncModels:
    • SyncMode - Sync operation modes (UPLOAD_ONLY, DOWNLOAD_ONLY, BIDIRECTIONAL, MIRROR_TO_CLOUD, MIRROR_FROM_CLOUD)
    • ConflictPolicy - Conflict resolution strategies (LOCAL_WINS, REMOTE_WINS, NEWER_WINS, KEEP_BOTH, SKIP, ASK_USER)
    • SyncItem - Represents file for sync with local/remote paths
    • SyncAction - Actions to perform (UPLOAD, DOWNLOAD, DELETE_LOCAL, DELETE_REMOTE, CONFLICT, SKIP, NONE)
    • SyncResult - Sealed class for sync outcomes (Success, PartialSuccess, Error, NotSignedIn, NetworkUnavailable, Cancelled)
    • SyncOptions - Customizable sync options with presets
    • SyncConfiguration - Client configuration data class
    • FileManifest and FileManifestEntry - For manifest-based comparison
  • Implemented ConflictResolver:
    • Conflict detection and resolution
    • Policy-based resolution strategies
    • User callback support for ASK_USER policy
    • Automatic rename for KEEP_BOTH policy
  • Implemented SyncEngine:
    • Core sync algorithm
    • Local and remote manifest building
    • Manifest comparison and action determination
    • Upload, download, and delete execution
    • Bidirectional and mirror sync support
    • Progress tracking integration
  • Implemented SyncManager:
    • Main sync orchestrator
    • Auth state verification
    • Network policy enforcement
    • Cancellation support
    • Multiple sync modes (sync, uploadOnly, downloadOnly, mirrorToCloud, mirrorFromCloud)
    • Last sync time tracking

Worker Module (worker/)

  • Implemented SyncWorker:
    • WorkManager CoroutineWorker for background sync
    • Support for all sync modes
    • Progress reporting
    • Retry logic with configurable max attempts
    • Output data with sync statistics
  • Implemented SyncScheduler:
    • Periodic sync scheduling with configurable interval
    • One-time sync requests
    • Constraint-based scheduling (network, battery, charging)
    • Work status observation via Flow
    • Cancel operations

API Module (api/)

  • Implemented GoogleSyncClient:
    • Main public entry point for the library
    • Configuration via builder pattern
    • Authentication methods (signIn, signOut, revokeAccess)
    • Sync operations (sync, uploadOnly, downloadOnly, mirrorToCloud, mirrorFromCloud)
    • Background sync scheduling
    • Progress and state observation via StateFlow
    • Conflict callback support
  • Implemented SyncClientConfigBuilder:
    • Fluent API for configuration
    • Root folder name, sync directory, file filter settings
    • Network and conflict policies
    • Extension and size filtering

Cache Module (cache/)

  • Implemented SyncCache:
    • In-memory manifest caching
    • Disk persistence via JSON serialization
    • Configurable cache expiration
    • Cache statistics
    • Cache invalidation methods
  • Implemented CacheConfig:
    • Maximum cache age
    • Maximum entries
    • Enable/disable toggle

Updated DI Module (di/)

  • Updated GoogleSyncModule with all new dependencies:
    • ConflictResolver
    • SyncEngine
    • SyncManager
    • SyncScheduler
    • SyncCache
    • GoogleSyncClient

2026-01-13 - Phase 7: Sample App Enhancement

Sample App

  • Implemented MainViewModel:
    • Auth state management
    • Sync operations (sync, uploadOnly, downloadOnly)
    • Periodic sync scheduling toggle
    • Progress and result handling
  • Updated MainActivity with Compose UI:
    • Authentication card with sign-in/sign-out
    • Sync progress card with real-time updates
    • Sync controls card (bidirectional, upload, download)
    • Settings card (sync directory, last sync time, periodic sync toggle)
    • Snackbar notifications for results
  • Added hilt-navigation-compose dependency for HiltViewModel

2026-01-13 - Sample App File Browser

File Browser Feature

  • Implemented FileBrowserScreen:
    • Directory navigation with back button
    • File/folder list with icons and metadata
    • Create new files and folders
    • Delete files and folders
    • File size and modification date display
    • Empty directory state
  • Integrated file browser into MainActivity:
    • "Browse Files" button in Settings card
    • Simple state-based navigation

2026-01-13 - Sync History Feature

Sync History (sync/)

  • Implemented SyncHistory:
    • SyncHistoryEntry - Serializable data class for history entries
    • SyncHistoryStatus - Enum for sync statuses
    • SyncHistoryManager - Manages history persistence and retrieval
    • SyncStatistics - Aggregated sync statistics
  • Integrated with SyncManager:
    • Automatic recording of sync results
    • History and statistics exposed via StateFlow
  • Updated GoogleSyncClient:
    • syncHistory - Observable history
    • getSyncStatistics() - Get aggregated stats
    • clearSyncHistory() - Clear all history

Sample App History Screen

  • Implemented SyncHistoryScreen:
    • Statistics card with totals
    • History list with status icons
    • Relative timestamps
    • Clear history functionality
    • Empty state handling
  • Integrated into MainActivity:
    • "View History" button in Settings card
    • Screen navigation

2026-01-13 - CHANGELOG and Release Preparation

Release Preparation

  • Created CHANGELOG.md following Keep a Changelog format:
    • Documented all features in v0.1.0 release
    • Listed planned features for future releases
    • Added version history summary
    • Added GitHub release links

2026-01-13 - Encryption, Backup/Restore, and Resilience

Encryption Module (crypto/)

  • Implemented CryptoManager:
    • AES-256-GCM encryption/decryption
    • Secure random IV generation
    • File and byte array encryption
  • Implemented PassphraseBasedCrypto:
    • PBKDF2WithHmacSHA256 key derivation
    • Configurable iteration count and key length
    • Salt generation and storage
  • Implemented EncryptionManager:
    • High-level coordinator for encryption operations
    • Support for both key-based and passphrase-based encryption

Backup/Restore Module (backup/)

  • Implemented BackupManager:
    • Create encrypted ZIP backups
    • Progress callbacks during backup
    • Backup metadata with timestamps and checksums
    • Integrity verification
  • Implemented RestoreManager:
    • Restore encrypted backups
    • Verify backup integrity before restoration
    • Progress callbacks during restore

Resilience Enhancements (resilience/)

  • Implemented RateLimitHandler:
    • Google Drive API rate limit detection
    • Exponential backoff with configurable parameters
    • Retry-After header parsing
  • Implemented RateLimitException:
    • Custom exception with retry delay calculation
    • Integration with existing retry logic
  • Enhanced SyncProgressManager:
    • Full resume state persistence via ResumeInfo
    • Pending files tracking for interrupted syncs
    • JSON serialization for state persistence

Recursive File Listing (drive/)

  • Implemented listAllFilesRecursive() in DriveFileOperations:
    • Recursively lists all files in subdirectories
    • Returns files with relative paths from sync root
  • Implemented buildFileCache():
    • Builds O(1) lookup cache for efficient sync
    • Maps paths to files and checksums to paths
  • Added DriveFileWithPath data class:
    • Wraps DriveFile with relative path
  • Added DriveFileCache data class:
    • Path-to-file mapping
    • Checksum-to-path mapping for deduplication
  • Updated buildRemoteManifest() in SyncEngine:
    • Now uses recursive listing
    • Files matched by full relative path (e.g., "subdir/file.txt")
  • Added driveFileId to FileManifestEntry:
    • Enables direct file downloads with correct ID

2026-01-13 - Multi-Device Safety and Rate Limiting

Sync Metadata (sync/)

  • Implemented SyncMetadataManager:
    • Instance ID generation and persistence
    • Device name tracking
    • Checksum tracking for change detection
    • Metadata serialization/deserialization
  • Implemented SyncMetadataInfo:
    • Instance ID for multi-device safety
    • Last sync checksum
    • Timestamp and app version
    • Device name for identification
  • Implemented SyncMetadataValidation:
    • Valid, NoMetadata, InstanceMismatch, Error states
  • Added upload/download sync metadata extension functions

Rate Limiting and Resilience (sync/)

  • Added batch processing to executeSyncPlan():
    • Process files in batches of 20 (configurable)
    • 1 second delay between batches
    • Prevents API rate limiting
  • Added progress timeout monitoring:
    • 30 second timeout for stalled syncs
    • Automatic cancellation with CancellationException
    • Progress time tracking per operation

2026-01-13 - README Documentation Update

Documentation

  • Updated README.md with comprehensive documentation:
    • Accurate API examples matching actual implementation
    • Hilt dependency injection setup
    • Google Sign-In with ActivityResult API
    • All sync operations (sync, uploadOnly, downloadOnly, mirrorToCloud, mirrorFromCloud)
    • Background sync scheduling with WorkManager
    • Progress and auth state observation via StateFlow
    • Sync history and statistics API
    • Complete configuration options reference
    • All conflict resolution policies
    • All network policies
    • All sync modes
    • Comprehensive file filter documentation
    • Error handling patterns
    • Project structure overview
    • Building and testing instructions
    • Sample app description
    • Roadmap section

2026-01-13 - Unit Tests Implementation

Local Module Tests (local/)

  • FileFilterTest - Comprehensive tests for all filter types:
    • Extension filters (include/exclude)
    • Size filters (min/max/range)
    • Hidden file filters
    • Glob pattern filters
    • Composite filters (and/or/not)
    • Default sync filter
  • FileHasherTest - Tests for file hashing:
    • MD5 and SHA256 hash calculation
    • Hash verification
    • Hashed filename creation and extraction

Sync Module Tests (sync/)

  • ConflictResolverTest - Tests for conflict resolution:
    • All conflict policies (LOCAL_WINS, REMOTE_WINS, NEWER_WINS, KEEP_BOTH, SKIP, ASK_USER)
    • Timestamp-based resolution
    • User callback integration
    • Conflict detection
    • Conflict suffix generation
  • SyncModelsTest - Tests for sync data classes:
    • SyncItem, SyncAction, SyncMode, ConflictPolicy
    • SyncResult variants (Success, PartialSuccess, Error, etc.)
    • SyncOptions presets
    • FileManifest and FileManifestEntry
    • ConflictInfo and ConflictResolution

Resilience Module Tests (resilience/)

  • RetryPolicyTest - Tests for retry behavior:
    • Policy presets (DEFAULT, AGGRESSIVE, MINIMAL, NONE)
    • shouldRetry logic for various exceptions
    • Delay calculation with exponential backoff
    • withRetry function with success and failure scenarios

Milestones

Milestone 1: Project Foundation

Status: Completed Target: Initial project structure and documentation

  • Repository initialization
  • Core documentation (AGENTS.md, TODO.md, PROGRESS.md)
  • Gradle project structure
  • Build configuration
  • CI/CD setup

Milestone 2: Core Library Implementation

Status: Completed Target: Functional sync library

  • Authentication module
  • Drive operations module
  • Local file operations
  • Resilience module
  • Dependency injection
  • Sync engine core
  • Conflict resolution
  • Unit tests

Milestone 3: Production Ready

Status: In Progress (60%) Target: Release-ready library

  • Background sync (WorkManager)
  • Public API finalization
  • Comprehensive tests
  • Documentation

Reference Projects

This library is informed by patterns from:

  1. vane-client-manager (Primary Reference)

    • Clean Architecture implementation
    • Google Drive integration patterns
    • Hilt dependency injection
    • Robust error handling
    • WorkManager background jobs

  2. vane-spark-notes (Secondary Reference)

    • GoogleDriveSyncManager implementation
    • Checksum-based deduplication
    • File hashing utilities
    • Folder hierarchy management
    • Sync progress tracking

Version History

Version Date Description
0.0.1 2026-01-13 Project initialization, documentation setup
0.0.2 2026-01-13 Phase 2 core infrastructure (auth, drive, local, resilience, DI)
0.0.3 2026-01-13 Phase 3-5: Sync engine, worker, public API, cache
0.0.4 2026-01-13 Phase 7: Sample app with full UI implementation
0.0.5 2026-01-13 Unit tests for local, sync, and resilience modules
0.0.6 2026-01-13 Comprehensive README documentation
0.0.7 2026-01-13 Encryption, backup/restore, rate limiting
0.0.8 2026-01-13 Recursive file listing and file cache for efficient sync
0.0.9 2026-01-13 Multi-device safety, sync metadata, batch processing

Last Updated: 2026-01-13