Created
March 26, 2019 15:43
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Http.fs - Demonstrate a way to retry fetching a new access token when old one expired
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| [<RequireQualifiedAccess>] | |
| module Http | |
| open Fable.Import | |
| open Fable.PowerPack | |
| open Fable.PowerPack.Fetch | |
| open Thoth.Json | |
| open Fable.Core.JsInterop | |
| type User = | |
| { Id : int | |
| Permissions : string | |
| Firstname : string | |
| Surname : string | |
| Token : string | |
| RefreshToken : string | |
| DefaultDomain : int } | |
| static member Decoder = | |
| Decode.object | |
| (fun get -> | |
| { Id = get.Required.Field "userId" Decode.int | |
| Permissions = get.Required.Field "permissions" Decode.string | |
| Firstname = get.Required.Field "firstname" Decode.string | |
| Surname = get.Required.Field "surname" Decode.string | |
| Token = get.Required.Field "token" Decode.string | |
| RefreshToken = get.Required.Field "refreshToken" Decode.string | |
| DefaultDomain = get.Required.Field "defaultDomain" Decode.int } : User ) | |
| let inline applyDecoder decoder promise = | |
| promise | |
| |> Promise.map (fun res -> | |
| match Decode.fromString decoder res with | |
| | Ok successValue -> successValue | |
| | Error error -> | |
| failwith error | |
| ) | |
| type FetchResult = | |
| | Success of Response | |
| | BadStatus of Response | |
| | NetworkError | |
| let fetch (url: string) (init: RequestProperties list) : JS.Promise<FetchResult> = | |
| GlobalFetch.fetch(RequestInfo.Url url, requestProps init) | |
| |> Promise.map (fun response -> | |
| if response.Ok then | |
| Success response | |
| else | |
| if response.Status < 200 || response.Status >= 300 then | |
| BadStatus response | |
| else | |
| NetworkError | |
| ) | |
| let postRecord (url: string) (body: string) (properties: RequestProperties list) = | |
| let defaultProps = | |
| [ RequestProperties.Method HttpMethod.POST | |
| requestHeaders [ ContentType "application/json" ] | |
| RequestProperties.Body !^(body) ] | |
| List.append defaultProps properties | |
| |> fetch url | |
| |> Promise.bind(fun result -> | |
| promise { | |
| match result with | |
| | Success response -> return response | |
| | BadStatus response -> | |
| return failwith (string response.Status + " " + response.StatusText + " for URL " + response.Url) | |
| | NetworkError -> | |
| return failwith "network error" | |
| } | |
| ) | |
| let putRecord (url: string) (body: string) (properties: RequestProperties list) = | |
| let defaultProps = | |
| [ RequestProperties.Method HttpMethod.PUT | |
| requestHeaders [ ContentType "application/json" ] | |
| RequestProperties.Body !^(body) ] | |
| List.append defaultProps properties | |
| |> fetch url | |
| |> Promise.bind(fun result -> | |
| promise { | |
| match result with | |
| | Success response -> return response | |
| | BadStatus response -> | |
| return failwith (string response.Status + " " + response.StatusText + " for URL " + response.Url) | |
| | NetworkError -> | |
| return failwith "network error" | |
| } | |
| ) | |
| module Auth = | |
| let private notifySessionChange (user : User) = | |
| let detail = | |
| jsOptions<Browser.CustomEventInit>(fun o -> | |
| o.detail <- Some (box user) | |
| ) | |
| let event = Browser.CustomEvent.Create("onSessionUpdate", detail) | |
| Browser.window.dispatchEvent(event) | |
| |> ignore | |
| exception UnknownRefreshToken | |
| let handleRefreshToken user (httpRequest : string -> JS.Promise<FetchResult>) result = | |
| promise { | |
| match result with | |
| | Success response -> return response | |
| | BadStatus response -> | |
| if response.Status = 401 then | |
| let body = | |
| Encode.object [ | |
| "refreshToken", Encode.string user.RefreshToken | |
| ] |> Encode.toString 0 | |
| let! res = postRecord "/api/auth/token" body [] | |
| let! txt = res.text() | |
| match Decode.fromString (Decode.field "code" Decode.string) txt with | |
| | Ok "unkown_token" -> | |
| return raise UnknownRefreshToken | |
| | Ok "success" -> | |
| match Decode.fromString (Decode.field "data" User.Decoder) txt with | |
| | Ok user -> | |
| let! secondRes = httpRequest user.Token | |
| match secondRes with | |
| | Success response -> | |
| notifySessionChange user | |
| return response | |
| | BadStatus response -> return failwith "bad status" | |
| | NetworkError -> return failwith "network error" | |
| | Error error -> return failwith error | |
| | Ok code -> return failwith ("Unkown code: `" + code + "`") | |
| | Error error -> return failwith error | |
| else | |
| return failwith (string response.Status + " " + response.StatusText + " for URL " + response.Url) | |
| | NetworkError -> | |
| return failwith "network error" | |
| } | |
| let getRecord (url : string) (user: User) (properties: RequestProperties list) = | |
| let httpRequest token = | |
| let defaultProps = | |
| [ RequestProperties.Method HttpMethod.GET | |
| requestHeaders [ ContentType "application/json" | |
| Authorization ("Bearer " + token) ] ] | |
| List.append defaultProps properties | |
| |> fetch url | |
| httpRequest user.Token | |
| |> Promise.bind (handleRefreshToken user httpRequest) | |
| |> Promise.catch (fun err -> | |
| match err with | |
| | UnknownRefreshToken -> | |
| Browser.localStorage.removeItem("session") | |
| Browser.location.href <- "/#login?needLogin" | |
| failwith "User redirection has been executed" | |
| | _ -> | |
| failwithf "Unkown error: %A" err | |
| ) | |
| let postRecord (url: string) (user : User) (body: string) (properties: RequestProperties list) = | |
| let httpRequest token = | |
| let defaultProps = | |
| [ RequestProperties.Method HttpMethod.POST | |
| requestHeaders [ ContentType "application/json" | |
| Authorization ("Bearer " + token) ] | |
| RequestProperties.Body !^(body) ] | |
| List.append defaultProps properties | |
| |> fetch url | |
| httpRequest user.Token | |
| |> Promise.bind (handleRefreshToken user httpRequest) | |
| |> Promise.catch (fun err -> | |
| match err with | |
| | UnknownRefreshToken -> | |
| Browser.localStorage.removeItem("session") | |
| Browser.location.href <- "/#login?needLogin" | |
| failwith "User redirection has been executed" | |
| | _ -> | |
| failwithf "Unkown error: %A" err | |
| ) | |
| let putRecord (url: string) (user : User) (body: string) (properties: RequestProperties list) = | |
| let httpRequest token = | |
| let defaultProps = | |
| [ RequestProperties.Method HttpMethod.PUT | |
| requestHeaders [ ContentType "application/json" | |
| Authorization ("Bearer " + token) ] | |
| RequestProperties.Body !^(body) ] | |
| List.append defaultProps properties | |
| |> fetch url | |
| httpRequest user.Token | |
| |> Promise.bind (handleRefreshToken user httpRequest) | |
| |> Promise.catch (fun err -> | |
| match err with | |
| | UnknownRefreshToken -> | |
| Browser.localStorage.removeItem("session") | |
| Browser.location.href <- "/#login?needLogin" | |
| failwith "User redirection has been executed" | |
| | _ -> | |
| failwithf "Unkown error: %A" err | |
| ) |
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Function under
Authwill try once to get a newaccess tokenif the session expired.If it succeeds retrieving a new
access tokenthen it will re-send the request.You can register
onSessionUpdatefrom your application in order to update theaccess tokenstored in your application.