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Validate a device

let result = try await grantiva.validateAttestation()
This performs the full attestation flow:
  1. Requests a one-time challenge from the server
  2. Generates or retrieves an attestation key via Apple’s App Attest
  3. Creates an attestation object on-device
  4. Sends it to the Grantiva server for validation
  5. Returns a signed JWT with device intelligence

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AttestationResult

result.isValid              // Bool — whether the device passed
result.token                // String — signed JWT token
result.expiresAt            // Date — token expiration
result.deviceIntelligence   // DeviceIntelligence
result.customClaims         // [String: Any] — your custom JWT claims

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DeviceIntelligence

result.deviceIntelligence.deviceId           // String — unique device ID
result.deviceIntelligence.riskScore          // Int — 0 to 100
result.deviceIntelligence.deviceIntegrity    // String — integrity status
result.deviceIntelligence.jailbreakDetected  // Bool
result.deviceIntelligence.attestationCount   // Int — total attestations from this device
result.deviceIntelligence.lastAttestationDate // Date?

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Token caching

The SDK automatically caches valid tokens. Calling validateAttestation() multiple times reuses the cached token until it expires, then performs a fresh attestation. 
// First call — full attestation flow
let result1 = try await grantiva.validateAttestation()

// Second call — returns cached token instantly
let result2 = try await grantiva.validateAttestation()

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Refresh tokens

Check if the current token is still valid, and refresh if expired: 
if let result = try await grantiva.refreshToken() {
    // Token is valid or was refreshed
    print(result.token)
}
Returns nil if no token has been stored yet (call validateAttestation() first).

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Check token status

// Synchronous check — does a valid token exist?
if grantiva.isTokenValid() {
    let token = grantiva.getCurrentToken()
    // Use token in API requests
}

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Clear stored data

Force a fresh attestation on the next call: 
grantiva.clearStoredData()
This clears cached keys and tokens from the Keychain. Useful for testing or user logout.

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Use the token

Send the JWT to your backend as a Bearer token: 
var request = URLRequest(url: yourAPIEndpoint)
request.setValue("Bearer \(result.token)", forHTTPHeaderField: "Authorization")
Your backend can decode the JWT to read:
  • Device risk score
  • Jailbreak detection status
  • Device model and OS version
  • Custom claims configured in the dashboard

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Error handling

do {
    let result = try await grantiva.validateAttestation()
} catch GrantivaError.deviceNotSupported {
    // App Attest unavailable (simulator, old device)
} catch GrantivaError.networkError(let error) {
    // Network issue — retry later
} catch GrantivaError.validationFailed {
    // Device failed attestation — potentially compromised
} catch GrantivaError.challengeExpired {
    // Challenge timed out — retry automatically
} catch {
    print(error.localizedDescription)
}
See Error Handling for the full list of error types.