File Sharing App

Implement fast, resumable, and verifiable file transfers. Pair the transfer protocol with explicit user consent and strong validation.

1) Design the transfer flow

1. User selects a file
2. Sender sends a small “offer” message (name/size/hash)
3. Receiver accepts/declines
4. Start a FileTransfer with TransferOptions

2) Choose TransferOptions

• Use resumable transfers on mobile networks.
• Enable integrity verification for user-visible files.
• Pick chunk size based on throughput vs resume granularity.

val options = TransferOptions(
  chunkSizeBytes = 256 * 1024,
  resumeEnabled = true,
  verifyIntegrity = true
)

3) Progress UI

val transfer = p2p.sendFile(peerId, file, options)

transfer
  .onProgress { p -> updateProgress(p) }
  .onComplete { ok -> notifyComplete(ok) }

4) Safety checklist

• Validate filenames and types; never auto-open files.
• Bound total disk usage and per-peer transfer rate.
• Require explicit accept on receiver before transfer begins.
• Log transfer failures with trace IDs for support.