138 lines
3.8 KiB
Crystal
138 lines
3.8 KiB
Crystal
# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
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# Copyright (C) 2022 Dominic Grimm
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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require "http/request"
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require "graphql"
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module Backend
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module Api
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# GraphQL request context class
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class Context < GraphQL::Context
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# Development mode
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getter development : Bool
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# Authenticated user
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getter user : Db::User?
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# User is admin
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getter admin : Bool?
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# User's role
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getter role : Schema::UserRole?
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# User's external object
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getter external : (Db::Teacher | Db::Student)?
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def initialize(request : HTTP::Request, @development : Bool, *rest)
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super(*rest)
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token = request.headers["Authorization"]?
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if token && token[..Auth::BEARER.size - 1] == Auth::BEARER
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payload = Auth.decode_jwt?(token[Auth::BEARER.size..])
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return unless payload
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data = payload["data"].as_h
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@user = Db::User.find(data["user_id"].as_i)
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return unless @user
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if @user
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@admin = @user.not_nil!.admin
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@role = Schema::UserRole.parse(@user.not_nil!.role)
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@external =
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case @role.not_nil!
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when .teacher?
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@user.not_nil!.teacher
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when .student?
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@user.not_nil!.student
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end
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end
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end
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end
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# User is authenticated
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def authenticated? : Bool
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!!@user
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end
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# :ditto:
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def authenticated! : Bool
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raise "Not authenticated" unless authenticated?
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true
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end
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# User is admin
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def admin? : Bool
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authenticated? && !!@admin
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end
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# :ditto:
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def admin! : Bool
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raise "Invalid permissions" unless admin?
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true
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end
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# User's is one of *roles*
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def role?(external_check = true, *roles : Schema::UserRole) : Bool
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return false unless authenticated?
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roles.each do |role|
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return true if @role == role && if external_check
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role == case @external.not_nil!
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when Db::Teacher
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Schema::UserRole::Teacher
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when Db::Student
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Schema::UserRole::Student
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end
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else
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true
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end
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end
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false
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end
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# :ditto:
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def role!(external_check = true, *roles : Schema::UserRole) : Bool
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raise "Invalid permissions" unless role? external, *roles
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true
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end
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# User is teacher
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def teacher?(external_check = true) : Bool
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role? external_check, Schema::UserRole::Teacher
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end
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# :ditto:
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def teacher!(external_check = true) : Bool
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role! external_check, Schema::UserRole::Teacher
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end
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# User is student
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def student?(external_check = true) : Bool
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role? external_check, Schema::UserRole::Student
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end
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# :ditto:
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def student!(external_check = true) : Bool
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role! external_check, Schema::UserRole::Student
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end
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end
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end
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end
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