Update lexicon route decorators

amanuensis/backend/membership.py

@@ -64,3 +64,12 @@ def create(
     db.session.add(new_membership)
     db.session.commit()
     return new_membership
+
+
+def try_from_ids(db: DbContext, user_id: int, lexicon_id: int) -> Membership:
+    """Get a membership by the user and lexicon ids, or None if no such membership was found."""
+    return db(
+        select(Membership)
+        .where(Membership.user_id == user_id)
+        .where(Membership.lexicon_id == lexicon_id)
+    ).scalar_one_or_none()

amanuensis/errors.py

@@ -16,6 +16,7 @@ class BackendArgumentTypeError(ArgumentError):
     A call to a backend function was made with a value of an invalid type for the parameter.
     Specify the invalid parameter and value as a kwarg.
     """
+
     def __init__(self, obj_type, **kwarg):
         if not kwarg:
             raise ValueError("Missing kwarg")

amanuensis/server/helpers.py

@@ -1,62 +1,38 @@
-# Standard library imports
-from datetime import datetime
 from functools import wraps
+from typing import Optional
 
-# Third party imports
-from flask import g, flash, redirect, url_for, current_app
+from flask import g, flash, redirect, url_for
 from flask_login import current_user
 
-# Module imports
-from amanuensis.parser import filesafe_title
-from amanuensis.models import ModelFactory, UserModel, LexiconModel
-
-
-def register_custom_filters(app):
-	"""Adds custom filters to the Flask app"""
-
-	@app.template_filter("user_attr")
-	def get_user_attr(uid, attr):
-		factory: ModelFactory = current_app.config['model_factory']
-		user: UserModel = factory.user(uid)
-		val = getattr(user.cfg, attr)
-		return val
-
-	@app.template_filter("articlelink")
-	def article_link(title):
-		return url_for(
-			'lexicon.article',
-			name=g.lexicon.cfg.name,
-			title=filesafe_title(title))
-
-	@app.context_processor
-	def lexicon_status():
-		return dict(
-			PREGAME=LexiconModel.PREGAME,
-			ONGOING=LexiconModel.ONGOING,
-			COMPLETE=LexiconModel.COMPLETE)
+from amanuensis.backend import lexiq, memq
+from amanuensis.db import DbContext, Lexicon, User, Membership
 
 
 def lexicon_param(route):
-	"""Wrapper for loading a route's lexicon"""
+    """
+    Wrapper for loading a route's lexicon to `g`.
+    This decorator should be applied above any other decorators that reference `g.lexicon`.
+    """
     @wraps(route)
-	def with_lexicon(**kwargs):
-		name = kwargs.get('name')
-		model_factory: ModelFactory = current_app.config['model_factory']
-		g.lexicon = model_factory.lexicon(name)
-		if g.lexicon is None:
-			flash(f'Couldn\'t find a lexicon with the name "{name}"')
+    def with_lexicon(*args, **kwargs):
+        name: str = kwargs.get('name')
+        lexicon: Optional[Lexicon] = lexiq.try_from_name(name)
+        if lexicon is None:
+            flash(f"Couldn't find a lexicon with the name \"{name}\"")
             return redirect(url_for("home.home"))
-		return route(**kwargs)
+        g.lexicon = lexicon
+        return route(*args, **kwargs)
     return with_lexicon
 
 
 def admin_required(route):
     """
-	Requires the user to be an admin to load this page
+    Restricts a route to users who are site admins.
     """
     @wraps(route)
     def admin_route(*args, **kwargs):
-		if not current_user.cfg.is_admin:
+        user: User = current_user
+        if not user.is_site_admin:
             flash("You must be an admin to view this page")
             return redirect(url_for('home.home'))
         return route(*args, **kwargs)
@@ -65,28 +41,36 @@ def admin_required(route):
 
 def player_required(route):
     """
-	Requires the user to be a player in the lexicon to load this page
+    Restricts a route to users who are players in the current lexicon.
     """
     @wraps(route)
     def player_route(*args, **kwargs):
-		if current_user.uid not in g.lexicon.cfg.join.joined:
+        db: DbContext = g.db
+        user: User = current_user
+        lexicon: Lexicon = g.lexicon
+        mem: Optional[Membership] = memq.try_from_ids(db, user.id, lexicon.id)
+        if not mem:
             flash("You must be a player to view this page")
-			return (redirect(url_for('lexicon.contents', name=g.lexicon.cfg.name))
-				if g.lexicon.cfg.join.public
-				else redirect(url_for('home.home')))
+            if lexicon.public:
+                return redirect(url_for('lexicon.contents', name=lexicon.name))
+            else:
+                return redirect(url_for('home.home'))
         return route(*args, **kwargs)
     return player_route
 
 
 def player_required_if_not_public(route):
     """
-	Requires the user to be a player in the lexicon to load this page if the
-	lexicon has join.public = false
+    Restricts a route to users who are players in the current lexicon if the lexicon is nonpublic.
     """
     @wraps(route)
     def player_route(*args, **kwargs):
-		if ((not g.lexicon.cfg.join.public)
-				and current_user.uid not in g.lexicon.cfg.join.joined):
+        db: DbContext = g.db
+        user: User = current_user
+        lexicon: Lexicon = g.lexicon
+        if not lexicon.public:
+            mem: Optional[Membership] = memq.try_from_ids(db, user.id, lexicon.id)
+            if not mem:
                 flash("You must be a player to view this page")
                 return redirect(url_for('home.home'))
         return route(*args, **kwargs)
@@ -95,13 +79,16 @@ def player_required_if_not_public(route):
 
 def editor_required(route):
     """
-	Requires the user to be the editor of the current lexicon to load this
-	page
+    Restricts a route to users who are editors of the current lexicon.
     """
     @wraps(route)
     def editor_route(*args, **kwargs):
-		if current_user.uid != g.lexicon.cfg.editor:
+        db: DbContext = g.db
+        user: User = current_user
+        lexicon: Lexicon = g.lexicon
+        mem: Optional[Membership] = memq.try_from_ids(db, user.id, lexicon.id)
+        if not mem.is_editor:
             flash("You must be the editor to view this page")
-			return redirect(url_for('lexicon.contents', name=g.lexicon.cfg.name))
+            return redirect(url_for('lexicon.contents', name=lexicon.name))
         return route(*args, **kwargs)
     return editor_route