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the-biergarten-app/docs/website/diagrams-src/auth/update-email.puml

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@startuml update-email
!include ../../../pipeline/diagrams/biergarten-weizen-theme.puml
skinparam sequenceMessageAlign center
skinparam maxMessageSize 200
title User Authentication Flow - Update Email
actor User
participant "API\nController" as API
participant "MediatR pipeline\n(ValidationBehavior)" as Mediator
box "Handler Layer" #F1F3EA
participant "UpdateEmailHandler" as UpdateEmailHandler
participant "UserManager<ApplicationUser>" as UserMgr
end box
box "Repository / Cross-slice" #DBEEDD
participant "DapperUserStore\n(IUserStore/IUserPasswordStore/\nIUserEmailStore)" as UserStore
end box
database "SQL Server" as DB
note over UserMgr
ASP.NET Core Identity's UserManager<TUser>
replaces the deleted AuthRepository: handlers
no longer issue SQL or call Argon2 directly,
they delegate to UserManager, which in turn
calls DapperUserStore (persistence) and
Argon2PasswordHasher (IPasswordHasher<TUser>).
end note
User -> API: PATCH /api/auth/email\n{newEmail}\n(requires Bearer access token)
activate API
API -> Mediator: Send(UpdateEmailCommand(\n GetAuthenticatedUserId(), newEmail))
activate Mediator
note right of Mediator
ValidationBehavior runs UpdateEmailValidator
(same format rules as registration)
end note
alt Validation fails
Mediator -> API: throws FluentValidation.ValidationException
API -> User: 400 Bad Request
else Validation succeeds
Mediator -> UpdateEmailHandler: Handle(command)
activate UpdateEmailHandler
UpdateEmailHandler -> UserMgr: FindByIdAsync(userAccountId)
activate UserMgr
UserMgr -> UserStore: FindByIdAsync(userAccountId)
UserStore -> DB: SELECT ...
UserStore --> UserMgr: ApplicationUser or null
UserMgr --> UpdateEmailHandler: ApplicationUser or null
deactivate UserMgr
alt Account not found
UpdateEmailHandler -> Mediator: throw NotFoundException
Mediator -> API: propagate
API -> User: 404 Not Found
else Account found
UpdateEmailHandler -> UserMgr: SetEmailAsync(user, newEmail)
activate UserMgr
UserMgr -> UserStore: FindByEmailAsync(newEmail)
note right of UserMgr
Uniqueness check. Also resets
user.EmailConfirmed = false -
the caller must re-confirm via
POST /api/auth/confirm/resend.
end note
UserMgr -> UserStore: UpdateAsync(user)
UserStore -> DB: UPDATE dbo.UserAccount\nSET Email = @Email, ...
UserStore -> DB: DELETE FROM dbo.UserVerification\nWHERE UserAccountID = @Id
UserStore --> UserMgr: IdentityResult
UserMgr --> UpdateEmailHandler: IdentityResult
deactivate UserMgr
alt !result.Succeeded
UpdateEmailHandler -> Mediator: throw ConflictException\n(DuplicateEmail code ->\n"Email address already exists")
Mediator -> API: propagate
API -> User: 409 Conflict
else result.Succeeded
UpdateEmailHandler --> Mediator: UpdateEmailPayload(\n user.Id, user.Email,\n user.EmailConfirmed = false)
deactivate UpdateEmailHandler
Mediator --> API: UpdateEmailPayload
deactivate Mediator
API -> User: 200 OK\n{message: "Email updated successfully.",\npayload: {...}}
end
end
end
deactivate API
@enduml