kacaii.dev
wip: currently rewriting the project as a full stack application
tangled.org/kacaii.dev/sigo
gleam
:recycle: no need to `bool.guard`
+47
-38
+47
-38
src/app/domain/user/login.gleam
+47
-38
src/app/domain/user/login.gleam
···
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import app/web/context.{type Context}
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import argus
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import formal/form
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-
import gleam/bool
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import gleam/float
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import gleam/http/response
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import gleam/json
···
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LoginToken(body: String, user_id: uuid.Uuid)
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}
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-
/// A form that decodes the `LogIn` value.
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fn login_form() -> form.Form(RequestBody) {
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form.new({
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use registration <- form.field("matricula", {
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form.parse_string |> form.check_not_empty()
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})
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use password <- form.field("senha", {
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form.parse_string |> form.check_not_empty()
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})
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form.success(RequestBody(registration:, password:))
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})
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}
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-
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/// Handles user login authentication and session management
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/// On success, sets a cookie on the client containing the User UUID,
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/// It will then be used on later requests for authetication.
···
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case form_result {
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Error(_) -> wisp.unprocessable_content()
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Ok(data) ->
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user.uuid_cookie_name
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|> handle_login(request:, ctx:, data:, cookie_name: _)
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Ok(data) -> {
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let cookie = user.uuid_cookie_name
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handle_login(request, ctx, data, cookie)
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}
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}
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}
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fn handle_login(
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request request: wisp.Request,
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ctx ctx: Context,
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data data: RequestBody,
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cookie_name cookie_name: String,
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request: wisp.Request,
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ctx: Context,
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data: RequestBody,
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name: String,
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) -> response.Response(wisp.Body) {
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case query_database(data:, ctx:) {
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case query_database(data, ctx) {
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Error(err) -> handle_error(err)
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Ok(resp) -> {
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log_login(data)
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set_token(resp, request, cookie_name)
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}
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Ok(resp) -> set_token(resp, request, name)
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}
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}
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fn set_token(
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resp: LoginToken,
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request: wisp.Request,
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cookie_name name: String,
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name: String,
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) -> wisp.Response {
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let response = wisp.json_response(resp.body, 200)
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let value = uuid.to_string(resp.user_id)
···
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wisp.set_cookie(response:, request:, name:, value:, security:, max_age:)
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}
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/// A form that decodes the `LogIn` value.
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fn login_form() -> form.Form(RequestBody) {
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form.new({
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use registration <- form.field("matricula", {
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form.parse_string |> form.check_not_empty()
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})
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use password <- form.field("senha", {
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form.parse_string |> form.check_not_empty()
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})
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RequestBody(registration:, password:)
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|> form.success
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})
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}
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fn handle_error(err: LoginError) -> response.Response(wisp.Body) {
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case err {
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InvalidPassword ->
···
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/// Check if the provided password matches the one inside our database
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/// Returns the user's UUID if successfull.
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fn query_database(
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data data: RequestBody,
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ctx ctx: Context,
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data: RequestBody,
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ctx: Context,
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) -> Result(LoginToken, LoginError) {
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use returned <- result.try(
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sql.query_login_token(ctx.db, data.registration)
···
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|> result.replace_error(UserNotFound),
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)
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use correct_password <- result.try(
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argus.verify(row.password_hash, data.password)
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|> result.replace_error(HashError),
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)
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use <- bool.guard(correct_password == False, Error(InvalidPassword))
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use _ <- result.map(verify_correct_password(row, data))
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let user_role = case row.user_role {
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sql.Admin -> role.Admin
···
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sql.Sargeant -> role.Sargeant
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}
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log_login(data)
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json.object([
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#("id", json.string(uuid.to_string(row.id))),
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#("role", json.string(role.to_string_pt_br(user_role))),
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])
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|> json.to_string
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|> LoginToken(body: _, user_id: row.id)
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|> Ok
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}
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fn verify_correct_password(
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row: sql.QueryLoginTokenRow,
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data: RequestBody,
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) -> Result(Nil, LoginError) {
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use correct_password <- result.try(
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argus.verify(row.password_hash, data.password)
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|> result.replace_error(HashError),
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)
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case correct_password {
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False -> Error(InvalidPassword)
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True -> Ok(Nil)
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}
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}