package ez_api
Easy API library and tools
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doc/src/ez_api.session_client/ezSessionClient.ml.html
Source file ezSessionClient.ml
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open EzSession.TYPES module type Make_S = sig type auth type nonrec login_error = [ | login_error | connect_error | logout_error | `Too_many_login_attempts | `Session_expired ] val connect : EzAPI.base_url -> ?token:string -> ((auth option, connect_error) result -> unit) -> unit val login : ?format:(string -> string) -> EzAPI.base_url -> ?login:string -> (* login *) ?password:string -> (* password *) ?foreign:(string * string) -> (* foreign authentication : origin * token *) ((auth, login_error) result -> unit) -> unit val logout : EzAPI.base_url -> token:string -> ((bool, logout_error) result -> unit) -> unit (* Tell the network layer that we think that the session has ended (a request probably returned an error status for missing auth). Since the state is kept internally, we have to do this first to trigger a full reconnection by `login`. *) val disconnected : unit -> unit val auth_headers : token:string -> (string * string) list val get : unit -> auth option end module Make(S: SessionArg) : Make_S with type auth = (S.user_id, S.user_info) auth = struct type nonrec login_error = [ | login_error | connect_error | logout_error | `Too_many_login_attempts | `Session_expired ] (* If cookies are in use on server-side, `connect` might return an already authenticated user. Otherwise (CSRF protection), a token can be provided (saved in local storage). *) module M = EzSession.Make(S) include M let _token = (* TODO *) () let _token = (* TODO *) () type state = | Disconnected | Connected of EzSession.TYPES.auth_needed | User of auth let state = ref Disconnected let disconnected () = state := Disconnected let auth_headers ~token = match S.token_kind with | `Cookie _name -> [] (* Cookies are automatically added by browsers *) | `CSRF name -> [name, token ] let connect api ?token f = begin match token with | None -> () | Some _ -> disconnected () end; match !state with | Disconnected -> let headers = match token with | Some token -> Some (auth_headers ~token) | None -> None in EzReq.get0 ~msg:"connect" api Service.connect ?headers ~params:[] (function | Ok (AuthOk auth) -> state := User auth; f (Ok (Some auth)) | Ok (AuthNeeded auth_needed) -> state := Connected auth_needed; f (Ok None) | Error e -> state := Disconnected; f (Error e) ) | Connected _ -> (try f (Ok None) with _ -> ()) | User u -> (try f (Ok (Some u)) with _ -> ()) let logout api ~token f = remove_cookie (); match !state with | Disconnected | Connected _ -> (try f (Ok false) with _ -> ()) | User u -> EzReq.get0 ~msg:"logout" api Service.logout ~params:[] ~headers:(auth_headers ~token) (function | Ok auth_needed -> remove_cookie u.auth_token; state := Connected auth_needed; f (Ok true) | Error e -> f (Error e) ) let rec login_rec ?format ntries api ?login ?password ?foreign (f : (('a, login_error) result -> unit)) = if ntries = 0 then (try f (Error `Too_many_login_attempts) with _ -> ()) else match !state with | Disconnected -> connect api (function | Error e -> f (Error (e :> login_error)) | Ok None -> login_rec ?format (ntries-1) api ?login ?password ?foreign f | Ok (Some u) -> if Some u.auth_login <> login then logout api ~token:u.auth_token (function Ok _ -> login_rec ?format (ntries-1) api ?login ?password ?foreign f | Error e -> f (Error (e :> login_error)) ) else f (Ok u)) | User u -> if Some u.auth_login <> login then logout api ~token:u.auth_token (function | Ok _ -> login_rec ?format (ntries-1) api ?login ?password f | Error e -> f (Error (e :> login_error)) ) else f (Ok u) | Connected { challenge_id; challenge } -> match login, password, foreign with | Some login, Some password, _ -> let pwhash = EzSession.Hash.password ~login ~password in let pwhash = match format with | None -> pwhash | Some f -> f pwhash in let login_challenge_reply = EzSession.Hash.challenge ~challenge ~pwhash in EzReq.post0 ~msg:"login" api Service.login ~input:(Local { login_user = login; login_challenge_id = challenge_id; login_challenge_reply; }) (function | Ok (LoginOk u) -> set_cookie u.auth_token; state := User u; f (Ok u) | Ok _ -> f (Error `Unverified_user) | Error `Challenge_not_found_or_expired _ -> login_rec ?format (ntries-1) api ~login ~password f | Error e -> f (Error (e :> login_error)) ) | _, _, Some (foreign_origin, foreign_token) -> EzReq.post0 ~msg:"login" api Service.login ~input:(Foreign { foreign_origin; foreign_token }) (function | Ok (LoginOk u) -> set_cookie u.auth_token; state := User u; f (Ok u) | Ok _ -> f (Error `Unverified_user) | Error `Challenge_not_found_or_expired _ -> login_rec ?format (ntries-1) api ?foreign f | Error e -> f (Error (e :> login_error)) ) | _ -> assert false let login ?format api ?login ?password ?foreign f = login_rec ?format 4 api ?login ?password ?foreign f let get () = match !state with | User u -> Some u | Disconnected | Connected _ -> None end
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