PNR Masker

Small but useful: a core library, CLI, and minimal API that mask PII/PCI fields in PNR/eticket JSON payloads.

Features

• Default masking profile: name, email, phone, PNR locator, card and document numbers.
• PnrMasker.Cli: reads from file or STDIN, masks, writes to stdout.
• PnrMasker.Api: accepts JSON via POST /mask, returns masked JSON; GET /health available.
• Tests: xUnit coverage for core rules and CLI flow.

Quick start

dotnet build
dotnet test

CLI

# Read from file
dotnet run --project PnrMasker.Cli -- --input sample.json --pretty

# Read from STDIN
cat sample.json | dotnet run --project PnrMasker.Cli --

API

dotnet run --project PnrMasker.Api

curl -X POST http://localhost:5000/mask \
  -H "Content-Type: application/json" \
  -d "{\"email\":\"test@example.com\",\"pnr\":\"ABC123\"}"

Structure

• PnrMasker.Core: masking rules and service.
• PnrMasker.Cli: command-line interface.
• PnrMasker.Api: minimal API.
• PnrMasker.Tests: xUnit tests.

Notes

• Default profile is extendable; currently targets identity, contact, payment, and document fields.
• Returns an error for invalid JSON; warns on empty input.

Example

Input:

{
  "pnr": "AB12CD",
  "email": "jane.doe@example.com",
  "phone": "+90-555-123-4567",
  "payments": { "cardNumber": "4111111111111111", "cvv": "123" }
}

Output (pretty):

{
  "pnr": "AB***CD",
  "email": "j***e@e***m",
  "phone": "+xx-xxx-xxx-xx67",
  "payments": {
    "cardNumber": "XXXXXXXXXXXX1111",
    "cvv": "***"
  }
}