| 1 | import Foundation |
| 2 | |
| 3 | #if canImport(FoundationNetworking) |
| 4 | import FoundationNetworking |
| 5 | #endif |
| 6 | |
| 7 | #if canImport(CryptoKit) |
| 8 | import CryptoKit |
| 9 | #else |
| 10 | import Crypto |
| 11 | #endif |
| 12 | |
| 13 | /// OpenID Connect Authorization Code + PKCE flow (public client). |
| 14 | /// |
| 15 | /// A faithful port of the canonical SDK's `oidc.rs`. Unlike the tenant |
| 16 | /// credential flow, this is a **public client**: it uses only an |
| 17 | /// `oidcClientId` — no `app_secret` — so it's appropriate for native and |
| 18 | /// browser apps. Drive the user agent yourself (or via `SmbCloudWebAuth` on |
| 19 | /// Apple) and feed the callback URL back into ``parseCallbackURL(_:)``. |
| 20 | public enum OIDC { |
| 21 | /// A prepared OIDC authorization request. Open ``authorizeURL`` in a browser. |
| 22 | public struct AuthorizationRequest: Sendable, Equatable { |
| 23 | public let authorizeURL: URL |
| 24 | public let redirectURI: String |
| 25 | public let state: String |
| 26 | public let codeVerifier: String |
| 27 | } |
| 28 | |
| 29 | /// The `code` + `state` extracted from a redirect callback. |
| 30 | public struct CallbackPayload: Sendable, Equatable { |
| 31 | public let code: String |
| 32 | public let state: String |
| 33 | } |
| 34 | |
| 35 | /// The `oauth/token` response. |
| 36 | public struct TokenResponse: Codable, Sendable, Equatable { |
| 37 | public let accessToken: String |
| 38 | public let tokenType: String |
| 39 | public let expiresIn: Int? |
| 40 | public let refreshToken: String? |
| 41 | public let scope: String? |
| 42 | public let idToken: String? |
| 43 | |
| 44 | enum CodingKeys: String, CodingKey { |
| 45 | case accessToken = "access_token" |
| 46 | case tokenType = "token_type" |
| 47 | case expiresIn = "expires_in" |
| 48 | case refreshToken = "refresh_token" |
| 49 | case scope |
| 50 | case idToken = "id_token" |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /// The `oauth/userinfo` response. |
| 55 | public struct UserInfo: Codable, Sendable, Equatable { |
| 56 | public let sub: String |
| 57 | public let email: String? |
| 58 | public let emailVerified: Bool? |
| 59 | public let tenantId: UInt64? |
| 60 | public let tenantSlug: String? |
| 61 | |
| 62 | enum CodingKeys: String, CodingKey { |
| 63 | case sub, email |
| 64 | case emailVerified = "email_verified" |
| 65 | case tenantId = "tenant_id" |
| 66 | case tenantSlug = "tenant_slug" |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static let scopes = "openid profile email" |
| 71 | |
| 72 | /// Mirrors `oidc::build_authorization_request`. |
| 73 | public static func buildAuthorizationRequest( |
| 74 | environment: SmbCloudEnvironment, |
| 75 | oidcClientId: String, |
| 76 | redirectURI: String |
| 77 | ) throws -> AuthorizationRequest { |
| 78 | let codeVerifier = UUID().uuidString.replacingOccurrences(of: "-", with: "") |
| 79 | + UUID().uuidString.replacingOccurrences(of: "-", with: "") |
| 80 | let codeChallenge = base64URLNoPad(Data(SHA256.hash(data: Data(codeVerifier.utf8)))) |
| 81 | let state = UUID().uuidString |
| 82 | |
| 83 | guard |
| 84 | var components = URLComponents( |
| 85 | url: environment.baseURL.appendingPathComponent("v1/client/oauth/authorize"), |
| 86 | resolvingAgainstBaseURL: false |
| 87 | ) |
| 88 | else { |
| 89 | throw SmbCloudError(code: .parseError, message: "Failed to build the authorize URL.") |
| 90 | } |
| 91 | components.queryItems = [ |
| 92 | URLQueryItem(name: "client_id", value: oidcClientId), |
| 93 | URLQueryItem(name: "redirect_uri", value: redirectURI), |
| 94 | URLQueryItem(name: "response_type", value: "code"), |
| 95 | URLQueryItem(name: "scope", value: scopes), |
| 96 | URLQueryItem(name: "state", value: state), |
| 97 | URLQueryItem(name: "code_challenge", value: codeChallenge), |
| 98 | URLQueryItem(name: "code_challenge_method", value: "S256"), |
| 99 | ] |
| 100 | guard let url = components.url else { |
| 101 | throw SmbCloudError(code: .parseError, message: "Failed to build the authorize URL.") |
| 102 | } |
| 103 | return AuthorizationRequest( |
| 104 | authorizeURL: url, |
| 105 | redirectURI: redirectURI, |
| 106 | state: state, |
| 107 | codeVerifier: codeVerifier |
| 108 | ) |
| 109 | } |
| 110 | |
| 111 | /// Mirrors `oidc::parse_callback_url`. |
| 112 | public static func parseCallbackURL(_ callbackURL: String) throws -> CallbackPayload { |
| 113 | guard let components = URLComponents(string: callbackURL) else { |
| 114 | throw SmbCloudError(code: .parseError, message: "The callback URL was not valid.") |
| 115 | } |
| 116 | let items = components.queryItems ?? [] |
| 117 | let code = items.first { $0.name == "code" }?.value |
| 118 | let state = items.first { $0.name == "state" }?.value |
| 119 | guard let code, let state else { |
| 120 | throw SmbCloudError(code: .invalidParams, message: "Missing authorization code or state.") |
| 121 | } |
| 122 | return CallbackPayload(code: code, state: state) |
| 123 | } |
| 124 | |
| 125 | /// Mirrors `oidc::exchange_code`. |
| 126 | public static func exchangeCode( |
| 127 | environment: SmbCloudEnvironment, |
| 128 | oidcClientId: String, |
| 129 | redirectURI: String, |
| 130 | code: String, |
| 131 | codeVerifier: String, |
| 132 | session: URLSession = .shared |
| 133 | ) async throws -> TokenResponse { |
| 134 | var request = URLRequest( |
| 135 | url: environment.baseURL.appendingPathComponent("v1/client/oauth/token")) |
| 136 | request.httpMethod = "POST" |
| 137 | request.setValue("application/json", forHTTPHeaderField: "Accept") |
| 138 | request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") |
| 139 | request.httpBody = formEncoded([ |
| 140 | ("grant_type", "authorization_code"), |
| 141 | ("client_id", oidcClientId), |
| 142 | ("code", code), |
| 143 | ("redirect_uri", redirectURI), |
| 144 | ("code_verifier", codeVerifier), |
| 145 | ]) |
| 146 | return try await HTTPTransport(session: session).requestJSON(request, as: TokenResponse.self) |
| 147 | } |
| 148 | |
| 149 | /// Mirrors `oidc::get_userinfo`. |
| 150 | public static func getUserInfo( |
| 151 | environment: SmbCloudEnvironment, |
| 152 | accessToken: String, |
| 153 | tenantId: String? = nil, |
| 154 | session: URLSession = .shared |
| 155 | ) async throws -> UserInfo { |
| 156 | var request = URLRequest( |
| 157 | url: environment.baseURL.appendingPathComponent("v1/client/oauth/userinfo")) |
| 158 | request.httpMethod = "GET" |
| 159 | request.setValue("Bearer \(accessToken)", forHTTPHeaderField: "Authorization") |
| 160 | request.setValue("application/json", forHTTPHeaderField: "Accept") |
| 161 | if let tenantId { |
| 162 | request.setValue(tenantId, forHTTPHeaderField: "X-Smbcloud-Tenant-Id") |
| 163 | } |
| 164 | return try await HTTPTransport(session: session).requestJSON(request, as: UserInfo.self) |
| 165 | } |
| 166 | |
| 167 | // MARK: - Helpers |
| 168 | |
| 169 | private static func base64URLNoPad(_ data: Data) -> String { |
| 170 | data.base64EncodedString() |
| 171 | .replacingOccurrences(of: "+", with: "-") |
| 172 | .replacingOccurrences(of: "/", with: "_") |
| 173 | .replacingOccurrences(of: "=", with: "") |
| 174 | } |
| 175 | |
| 176 | private static func formEncoded(_ items: [(String, String)]) -> Data? { |
| 177 | var components = URLComponents() |
| 178 | components.queryItems = items.map { URLQueryItem(name: $0.0, value: $0.1) } |
| 179 | return components.percentEncodedQuery?.data(using: .utf8) |
| 180 | } |
| 181 | } |