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//
// GitHubDeviceAuthClient.swift
// octosentry
//
// Implements the GitHub device authorization flow (spec §6): request a
// device/user code pair, show the user code, then poll until they've
// authorized it on github.com/login/device. No client secret involved —
// device flow for native apps doesn't use one.
//
import Foundation
actor GitHubDeviceAuthClient {
// Public client identifier for the "octosentry" OAuth App (Device Flow enabled).
// Not a secret — safe to embed in source.
private let clientID = "Ov23li6tqaTghDc4IJYv"
// Grants Dependabot/code scanning/secret scanning alert access. Classic OAuth
// scopes have no read-only variant (unlike fine-grained PATs); this is the
// narrowest scope GitHub offers for these three endpoints via OAuth Apps.
private let scope = "security_events"
private let session: URLSession
init(session: URLSession = .shared) {
self.session = session
}
func requestDeviceCode() async throws -> DeviceCodeResponse {
let data = try await post(
url: URL(string: "https://github.com/login/device/code")!,
parameters: ["client_id": clientID, "scope": scope]
)
do {
return try JSONDecoder().decode(DeviceCodeResponse.self, from: data)
} catch {
throw DeviceAuthError.decodingFailed(error.localizedDescription)
}
}
/// Polls until the user authorizes, denies, or the device code expires.
func pollForToken(deviceCode: String, interval: Int, expiresIn: Int) async throws -> String {
var currentInterval = interval
let deadline = Date().addingTimeInterval(TimeInterval(expiresIn))
while Date() < deadline {
try await Task.sleep(for: .seconds(currentInterval))
try Task.checkCancellation()
let data = try await post(
url: URL(string: "https://github.com/login/oauth/access_token")!,
parameters: [
"client_id": clientID,
"device_code": deviceCode,
"grant_type": "urn:ietf:params:oauth:grant-type:device_code",
]
)
let response: AccessTokenResponse
do {
response = try JSONDecoder().decode(AccessTokenResponse.self, from: data)
} catch {
throw DeviceAuthError.decodingFailed(error.localizedDescription)
}
if let token = response.accessToken {
return token
}
switch response.error {
case "authorization_pending":
continue
case "slow_down":
currentInterval = response.interval ?? (currentInterval + 5)
case "expired_token":
throw DeviceAuthError.expired
case "access_denied":
throw DeviceAuthError.denied
default:
throw DeviceAuthError.unknown(response.error ?? "unrecognized response")
}
}
throw DeviceAuthError.expired
}
private func post(url: URL, parameters: [String: String]) async throws -> Data {
var components = URLComponents()
components.queryItems = parameters.map { URLQueryItem(name: $0.key, value: $0.value) }
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("application/json", forHTTPHeaderField: "Accept")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.httpBody = Data((components.percentEncodedQuery ?? "").utf8)
let data: Data
let response: URLResponse
do {
(data, response) = try await session.data(for: request)
} catch {
throw DeviceAuthError.network(error.localizedDescription)
}
guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else {
throw DeviceAuthError.requestFailed
}
return data
}
}
nonisolated enum DeviceAuthError: Error, LocalizedError {
case network(String)
case requestFailed
case decodingFailed(String)
case expired
case denied
case unknown(String)
var errorDescription: String? {
switch self {
case .network(let message):
"Network error: \(message)"
case .requestFailed:
"Failed to reach GitHub."
case .decodingFailed(let message):
"Unexpected response from GitHub: \(message)"
case .expired:
"The sign-in code expired before it was used. Try again."
case .denied:
"Sign-in was denied on GitHub."
case .unknown(let message):
"GitHub sign-in failed: \(message)"
}
}
}
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