我尝试使用 Siesta 装饰器来启用一个流程，当登录用户获得 401 时，我的 authToken 会自动刷新。对于身份验证，我使用 Firebase。
在 Siesta 文档中，有一个关于如何链接 Siesta 请求的直接示例，但我找不到如何获取异步 Firebase getIDTokenForcingRefresh:completion: working here 的方法。问题是 Siesta 总是希望返回一个 Request 或一个RequestChainAction，而 Firebase auth token refresh api 无法做到这一点。
我知道请求链接主要是为仅 Siesta 的用例完成的。但是有没有办法使用像 FirebaseAuth 这样不完全适合图片的异步第三方 API？
这是代码：
init() {
configure("**") {
$0.headers["jwt"] = self.authToken
$0.decorateRequests {
self.refreshTokenOnAuthFailure(request: $1)
}
}
func refreshTokenOnAuthFailure(request: Request) -> Request {
return request.chained {
guard case .failure(let error) = $0.response, // Did request fail…
error.httpStatusCode == 401 else { // …because of expired token?
return .useThisResponse // If not, use the response we got.
}
return .passTo(
self.createAuthToken().chained { // If so, first request a new token, then:
if case .failure = $0.response { // If token request failed…
return .useThisResponse // …report that error.
} else {
return .passTo(request.repeated()) // We have a new token! Repeat the original request.
}
}
)
}
}
//What to do here? This should actually return a Siesta request
func createAuthToken() -> Void {
let currentUser = Auth.auth().currentUser
currentUser?.getIDTokenForcingRefresh(true) { idToken, error in
if let error = error {
// Error
return;
}
self.authToken = idToken
self.invalidateConfiguration()
}
}
编辑：
根据Adrian的建议答案，我尝试了以下解决方案。它仍然无法按预期工作：
- 我使用request() .post 发送请求
- 使用该解决方案，我在回调中收到失败的“请求已取消”
- 调用createUser的回调后，原始请求与更新的 jwt 令牌一起发送
- 这个具有正确 jwt 令牌的新请求会丢失，因为没有为响应调用createUser的回调 -> 因此在这种情况下永远不会达到onSuccess 。
如何确保仅在使用更新的 jwt 令牌发送原始请求后才调用 createUser 的回调？这是我不工作的解决方案 - 很高兴有任何建议：
// This ends up with a requestError "Request Cancelled" before the original request is triggered a second time with the refreshed jwt token.
func createUser(user: UserModel, completion: @escaping CompletionHandler) {
do {
let userAsDict = try user.asDictionary()
Api.sharedInstance.users.request(.post, json: userAsDict)
.onSuccess {
data in
if let user: UserModel = data.content as? UserModel {
completion(user, nil)
} else {
completion(nil, "Deserialization Error")
}
}.onFailure {
requestError in
completion(nil, requestError)
}
} catch let error {
completion(nil, nil, "Serialization Error")
}
}
Api 类：
class Api: Service {
static let sharedInstance = Api()
var jsonDecoder = JSONDecoder()
var authToken: String? {
didSet {
// Rerun existing configuration closure using new value
invalidateConfiguration()
// Wipe any cached state if auth token changes
wipeResources()
}
}
init() {
configureJSONDecoder(decoder: jsonDecoder)
super.init(baseURL: Urls.baseUrl.rawValue, standardTransformers:[.text, .image])
SiestaLog.Category.enabled = SiestaLog.Category.all
configure("**") {
$0.expirationTime = 1
$0.headers["bearer-token"] = self.authToken
$0.decorateRequests {
self.refreshTokenOnAuthFailure(request: $1)
}
}
self.configureTransformer("/users") {
try self.jsonDecoder.decode(UserModel.self, from: $0.content)
}
}
var users: Resource { return resource("/users") }
func refreshTokenOnAuthFailure(request: Request) -> Request {
return request.chained {
guard case .failure(let error) = $0.response, // Did request fail…
error.httpStatusCode == 401 else { // …because of expired token?
return .useThisResponse // If not, use the response we got.
}
return .passTo(
self.refreshAuthToken(request: request).chained { // If so, first request a new token, then:
if case .failure = $0.response {
return .useThisResponse // …report that error.
} else {
return .passTo(request.repeated()) // We have a new token! Repeat the original request.
}
}
)
}
}
func refreshAuthToken(request: Request) -> Request {
return Resource.prepareRequest(using: RefreshJwtRequest())
.onSuccess {
self.authToken = $0.text // …make future requests use it
}
}
}
请求委托：
class RefreshJwtRequest: RequestDelegate {
func startUnderlyingOperation(passingResponseTo completionHandler: RequestCompletionHandler) {
if let currentUser = Auth.auth().currentUser {
currentUser.getIDTokenForcingRefresh(true) { idToken, error in
if let error = error {
let reqError = RequestError(response: nil, content: nil, cause: error, userMessage: nil)
completionHandler.broadcastResponse(ResponseInfo(response: .failure(reqError)))
return;
}
let entity = Entity<Any>(content: idToken ?? "no token", contentType: "text/plain")
completionHandler.broadcastResponse(ResponseInfo(response: .success(entity))) }
} else {
let authError = RequestError(response: nil, content: nil, cause: AuthError.NOT_LOGGED_IN_ERROR, userMessage: "You are not logged in. Please login and try again.".localized())
completionHandler.broadcastResponse(ResponseInfo(response: .failure(authError)))
}
}
func cancelUnderlyingOperation() {}
func repeated() -> RequestDelegate { RefreshJwtRequest() }
private(set) var requestDescription: String = "CustomSiestaRequest"
}