CheckEffectiveUser extracts the requested user from a URL (like '/users/{user}'), compares it with the currently authorized user and writes an HTTP error if they differ.

GetEffectiveProjectsList returns the user's projects, including all alias targets and excluding all remapped project names (alias sources) Example: "A" mapped to "AB" using an alias -> "A" itself should not appear as a project anymore -> Instead, the "virtual" project "AB" shall appear See https://github.com/muety/wakapi/issues/231.