我正在尝试实现一个过滤器,该过滤器位于我的所有路由中并提取标头并将可能的令牌与存储在我的系统上的内容匹配。
我想实现类似翘曲拒绝示例的东西,但我得到了错误
期望一个实现该
Fn
特征的闭包,但这个闭包只实现FnOnce
闭包是FnOnce
因为它将变量tmp
移出其环境
我有点明白编译器在说什么,但不知道如何解决它。我以为做let tmp = store.clone()
会。
我有过滤器:
pub fn haystack_auth_header(store: Store) -> impl Filter<Extract = (Store,), Error = Rejection> + Clone {
let tmp = store.clone();
warp::header("Authorization").and_then (|auth_header: String| async move {
// Authorization: BEARER authToken=xxxyyyzzz
let result = auth_token(&auth_header); //-> IResult<&'a str, (&'a str, &'a str), (&'a str, ErrorKind)> {
if result.is_err() {
return Err(reject::custom(HayStackAuthToken));
}
let (_, key_value) = result.unwrap();
let auth_token_result = tmp.read().get_authtoken();
if auth_token_result.is_err() {
return Err(reject::custom(HayStackAuthToken));
}
let auth_token_option = auth_token_result.unwrap();
if auth_token_option.is_none() {
return Err(reject::custom(HayStackAuthToken));
}
let auth_token = auth_token_option.unwrap();
if auth_token != key_value.1 {
return Err(reject::custom(HayStackAuthToken));
}
Ok(tmp)
})
}
store
是type Store = Arc<RwLock<Box<dyn UserAuthStore>>>
和UserAuthStore
是trait UserAuthStore: fmt::Debug + Send + Sync
。
UserAuthStore 定义为
pub trait UserAuthStore: fmt::Debug + Send + Sync {
// Return handshake token for username. If user has no handshake token generate one
fn get_handshake_token(&self, username: &str) -> HaystackResult<String>;
fn get_username(&self, handshake_token: &str) -> HaystackResult<String>;
fn set_temporary_value(&mut self, k: &str, v: &str) -> HaystackResult<()>;
fn get_temporary_value(&self, k: &str) -> HaystackResult<Option<&String>>;
fn set_authtoken(&mut self, s: String) -> HaystackResult<()>;
/// returns a base64 encoded sha256 salt of password.
fn get_password_salt(&self) -> HaystackResult<String>;
fn get_salted_password(&self) -> HaystackResult<String>;
fn get_authtoken(&self) -> HaystackResult<Option<String>>;
}
为什么clone
在这里不起作用?
完整的错误是
error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
--> src/server/mod.rs:997:45
|
997 | warp::header("Authorization").and_then (|auth_header: String| async move {
| ___________________________________--------__^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^_-
| | | |
| | | this closure implements `FnOnce`, not `Fn`
| | the requirement to implement `Fn` derives from here
998 | |
999 | | // Authorization: BEARER authToken=xxxyyyzzz
1000 | | let result = auth_token(&auth_header); //-> IResult<&'a str, (&'a str, &'a str), (&'a str, ErrorKind)> {
... |
1026 | | Ok(tmp.clone())
1027 | | })
| |_____- closure is `FnOnce` because it moves the variable `tmp` out of its environment