{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://backup-tool.invalid/contracts/repository/v1/repository.schema.json",
  "title": "Backup Tool Repository v1",
  "type": "object",
  "additionalProperties": false,
  "required": ["repository_id", "format_version", "digest_algorithm", "compression", "encryption", "created_at"],
  "allOf": [
    {
      "if": {"properties": {"encryption": {"properties": {"mode": {"const": "none"}}}}},
      "then": {"properties": {"encryption": {"properties": {"key_id": {"type": "null"}}}}},
      "else": {"properties": {"encryption": {"properties": {"key_id": {"type": "string", "format": "uuid", "minLength": 1}}}}}
    }
  ],
  "properties": {
    "repository_id": {
      "type": "string",
      "format": "uuid",
      "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"
    },
    "format_version": {"const": 1},
    "digest_algorithm": {"const": "sha256"},
    "compression": {"enum": ["none", "zstd"]},
    "encryption": {
      "type": "object",
      "additionalProperties": false,
      "required": ["mode", "key_id"],
      "properties": {
        "mode": {"enum": ["none", "aes-256-gcm"]},
        "key_id": {"type": ["string", "null"], "minLength": 1}
      }
    },
    "created_at": {"type": "string", "format": "date-time", "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(?:\\.[0-9]+)?Z$"}
  }
}