DEV: Revert guardian changes (#24742)

I took the wrong approach here, need to rethink.

* Revert "FIX: Use Guardian.basic_user instead of new (anon) (#24705)"

This reverts commit 9057272ee2.

* Revert "DEV: Remove unnecessary method_missing from GuardianUser (#24735)"

This reverts commit a5d4bf6dd2.

* Revert "DEV: Improve Guardian devex (#24706)"

This reverts commit 77b6a038ba.

* Revert "FIX: Introduce Guardian::BasicUser for oneboxing checks (#24681)"

This reverts commit de983796e1.

app/controllers/about_controller.rb

@@ -22,7 +22,7 @@ class AboutController < ApplicationController
     end
     category_topic_ids = Category.select(:topic_id).where.not(topic_id: nil)
     public_topics =
-      Topic.listable_topics.visible.secured(Guardian.anon_user).where.not(id: category_topic_ids)
+      Topic.listable_topics.visible.secured(Guardian.new(nil)).where.not(id: category_topic_ids)
     stats = { public_topic_count: public_topics.count }
     stats[:public_post_count] = public_topics.sum(:posts_count) - stats[:public_topic_count]
     render json: stats

app/controllers/email_controller.rb

@@ -47,6 +47,6 @@ class EmailController < ApplicationController
     user = User.find_by_email(@email)
     raise Discourse::NotFound unless user
     topic = Topic.find_by(id: params[:topic_id].to_i) if @topic_id
-    @topic = topic if topic && Guardian.anon_user.can_see?(topic)
+    @topic = topic if topic && Guardian.new(nil).can_see?(topic)
   end
 end

lib/cooked_post_processor.rb

@@ -59,7 +59,7 @@ class CookedPostProcessor
   end
 
   def grant_badges
-    return if @post.user.blank? || !Guardian.basic_user.can_see?(@post)
+    return if @post.user.blank? || !Guardian.new.can_see?(@post)
 
     BadgeGranter.grant(Badge.find(Badge::FirstEmoji), @post.user, post_id: @post.id) if has_emoji?
     if @has_oneboxes

lib/discourse.rb

@@ -873,10 +873,6 @@ module Discourse
     @system_users[current_db] ||= User.find_by(id: SYSTEM_USER_ID)
   end
 
-  def self.basic_user
-    Guardian.basic_user
-  end
-
   def self.store
     if SiteSetting.Upload.enable_s3_uploads
       @s3_store_loaded ||= require "file_store/s3_store"

lib/guardian.rb

@@ -11,32 +11,6 @@ require "guardian/tag_guardian"
 require "guardian/topic_guardian"
 require "guardian/user_guardian"
 
-class GuardianUser
-  def initialize(user_alike)
-    @user_alike = user_alike
-  end
-
-  def actual
-    @user_alike
-  end
-
-  def fake?
-    if @user_alike.respond_to?(:fake?)
-      @user_alike.fake?
-    else
-      false
-    end
-  end
-
-  def authenticated?
-    if @user_alike.respond_to?(:authenticated?)
-      @user_alike.authenticated?
-    else
-      true
-    end
-  end
-end
-
 # The guardian is responsible for confirming access to various site resources and operations
 class Guardian
   include BookmarkGuardian
@@ -54,12 +28,6 @@ class Guardian
     def blank?
       true
     end
-    def fake?
-      true
-    end
-    def authenticated?
-      false
-    end
     def admin?
       false
     end
@@ -110,88 +78,15 @@ class Guardian
     end
   end
 
-  # In some cases, we want a user that is not totally anonymous, but has
-  # the absolute baseline of access to the forum, acting like a TL0 user
-  # that is logged in. This represents someone who cannot access any secure
-  # categories or PMs but can read public topics.
-  class BasicUser
-    def blank?
-      true
-    end
-    def fake?
-      true
-    end
-    def authenticated?
-      true
-    end
-    def admin?
-      false
-    end
-    def staff?
-      false
-    end
-    def moderator?
-      false
-    end
-    def anonymous?
-      false
-    end
-    def approved?
-      true
-    end
-    def staged?
-      false
-    end
-    def silenced?
-      false
-    end
-    def is_system_user?
-      false
-    end
-    def bot?
-      false
-    end
-    def secure_category_ids
-      []
-    end
-    def groups
-      @groups ||= Group.where(id: Group::AUTO_GROUPS[:trust_level_0])
-    end
-    def has_trust_level?(level)
-      level == TrustLevel[0]
-    end
-    def has_trust_level_or_staff?(level)
-      has_trust_level?(level)
-    end
-    def email
-      nil
-    end
-    def whisperer?
-      false
-    end
-    def in_any_groups?(group_ids)
-      group_ids.include?(Group::AUTO_GROUPS[:everyone]) || (group_ids & groups.map(&:id)).any?
-    end
-  end
-
   attr_reader :request
 
   def initialize(user = nil, request = nil)
-    @guardian_user = GuardianUser.new(user.presence || AnonymousUser.new)
-    @user = @guardian_user.actual
+    @user = user.presence || AnonymousUser.new
     @request = request
   end
 
-  def self.anon_user(request: nil)
-    new(AnonymousUser.new, request)
-  end
-
-  def self.basic_user(request: nil)
-    new(BasicUser.new, request)
-  end
-
   def user
-    @guardian_user.fake? ? nil : @user
+    @user.presence
   end
   alias current_user user
 
@@ -200,7 +95,7 @@ class Guardian
   end
 
   def authenticated?
-    @guardian_user.authenticated?
+    @user.present?
   end
 
   def is_admin?

lib/middleware/anonymous_cache.rb

@@ -169,7 +169,7 @@ module Middleware
       def theme_ids
         ids, _ = @request.cookies["theme_ids"]&.split("|")
         id = ids&.split(",")&.map(&:to_i)&.first
-        if id && Guardian.anon_user.allow_themes?([id])
+        if id && Guardian.new.allow_themes?([id])
           Theme.transform_ids(id)
         else
           []

lib/oneboxer.rb

@@ -385,22 +385,19 @@ module Oneboxer
   def self.local_topic(url, route, opts)
     if current_user = User.find_by(id: opts[:user_id])
       if current_category = Category.find_by(id: opts[:category_id])
-        return if !current_user.guardian.can_see_category?(current_category)
+        return unless Guardian.new(current_user).can_see_category?(current_category)
       end
 
       if current_topic = Topic.find_by(id: opts[:topic_id])
-        return if !current_user.guardian.can_see_topic?(current_topic)
+        return unless Guardian.new(current_user).can_see_topic?(current_topic)
       end
     end
 
-    topic = Topic.find_by(id: route[:id] || route[:topic_id])
-    return if topic.blank? || topic.private_message?
+    return unless topic = Topic.find_by(id: route[:id] || route[:topic_id])
+    return if topic.private_message?
 
-    # If we are oneboxing from one category to another, we need to use a basic guardian
-    # because some users can see more than others and we need the absolute baseline of
-    # access control here.
     if current_category.blank? || current_category.id != topic.category_id
-      return if !Guardian.basic_user.can_see_topic?(topic)
+      return unless Guardian.new.can_see_topic?(topic)
     end
 
     topic
@@ -483,7 +480,7 @@ module Oneboxer
     return unless route[:category_slug_path_with_id]
     category = Category.find_by_slug_path_with_id(route[:category_slug_path_with_id])
 
-    if Guardian.basic_user.can_see_category?(category)
+    if Guardian.new.can_see_category?(category)
       args = {
         url: category.url,
         name: category.name,

lib/pretty_text/helpers.rb

@@ -89,7 +89,7 @@ module PrettyText
       return unless topic_id.is_a?(Integer)
       # TODO this only handles public topics, secured one do not get this
       topic = Topic.find_by(id: topic_id)
-      if topic && Guardian.basic_user.can_see?(topic)
+      if topic && Guardian.new.can_see?(topic)
         { title: Rack::Utils.escape_html(topic.title), href: topic.url }
       elsif topic
         { title: I18n.t("on_another_topic"), href: Discourse.base_url + topic.slugless_url }

plugins/chat/app/services/chat/publisher.rb

@@ -52,7 +52,7 @@ module Chat
             message:
               Chat::MessageSerializer.new(
                 chat_message,
-                { scope: Guardian.anon_user, root: false },
+                { scope: anonymous_guardian, root: false },
               ).as_json,
           },
           permissions(chat_channel),
@@ -69,7 +69,7 @@ module Chat
             message:
               Chat::MessageSerializer.new(
                 chat_message,
-                { scope: Guardian.anon_user, root: false },
+                { scope: anonymous_guardian, root: false },
               ).as_json,
           },
           permissions(chat_channel),
@@ -258,7 +258,7 @@ module Chat
 
     def self.serialize_message_with_type(chat_message, type, options = {})
       Chat::MessageSerializer
-        .new(chat_message, { scope: Guardian.anon_user, root: :chat_message })
+        .new(chat_message, { scope: anonymous_guardian, root: :chat_message })
         .as_json
         .merge(type: type)
         .merge(options)
@@ -470,5 +470,9 @@ module Chat
         group_ids: channel.allowed_group_ids.presence,
       }.compact
     end
+
+    def self.anonymous_guardian
+      Guardian.new(nil)
+    end
   end
 end

plugins/chat/lib/chat/onebox_handler.rb

@@ -19,7 +19,7 @@ module Chat
         thread = Chat::Thread.find_by(id: route[:thread_id]) if route[:thread_id]
       end
 
-      return if !Guardian.basic_user.can_preview_chat_channel?(chat_channel)
+      return if !Guardian.new.can_preview_chat_channel?(chat_channel)
 
       args = build_args(url, chat_channel)
 

plugins/chat/plugin.rb

@@ -105,7 +105,7 @@ after_initialize do
           end
       end
 
-      next if !Guardian.basic_user.can_preview_chat_channel?(chat_channel)
+      next if !Guardian.new.can_preview_chat_channel?(chat_channel)
 
       { url: url, title: title }
     end

plugins/poll/lib/polls_updater.rb

@@ -114,7 +114,7 @@ module DiscoursePoll
               polls,
               each_serializer: PollSerializer,
               root: false,
-              scope: Guardian.basic_user,
+              scope: Guardian.new(nil),
             ).as_json
           post.publish_message!("/polls/#{post.topic_id}", post_id: post.id, polls: polls)
         end

spec/lib/oneboxer_spec.rb

@@ -932,92 +932,4 @@ RSpec.describe Oneboxer do
       expect(Oneboxer.preview(url)).to eq("Custom Onebox for Wizard")
     end
   end
-
-  describe ".local_topic" do
-    fab!(:topic)
-    fab!(:user)
-
-    let(:url) { topic.url }
-    let(:route) { Discourse.route_for(url) }
-
-    context "when user_id is not provided" do
-      let(:opts) { {} }
-
-      it "returns nil if the topic is a private message" do
-        topic.update!(archetype: Archetype.private_message, category: nil)
-        expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-      end
-
-      it "returns nil if basic user cannot see the topic" do
-        topic.update!(category: Fabricate(:private_category, group: Fabricate(:group)))
-        expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-      end
-
-      it "returns topic if basic user can see the topic" do
-        expect(Oneboxer.local_topic(url, route, opts)).to eq(topic)
-      end
-    end
-
-    context "when user_id is provided" do
-      context "when category_id is provided" do
-        fab!(:category)
-
-        let(:opts) { { category_id: category.id, user_id: user.id } }
-
-        before { topic.update!(category: category) }
-
-        it "returns nil if the user cannot see the category" do
-          category.update!(read_restricted: true)
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-        end
-
-        it "returns the topic if the user can see the category" do
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(topic)
-        end
-
-        it "returns nil if basic user users cannot see the topic" do
-          topic.update!(category: Fabricate(:private_category, group: Fabricate(:group)))
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-        end
-
-        it "returns nil if the topic is a private message" do
-          topic.update!(archetype: Archetype.private_message, category: nil)
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-        end
-
-        context "when category_id is mismatched" do
-          fab!(:other_category) { Fabricate(:private_category, group: Fabricate(:group)) }
-
-          before { topic.update!(category: other_category) }
-
-          it "returns nil if the basic user cannot see the topic" do
-            expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-          end
-
-          it "returns topic if the basic user can see the topic" do
-            other_category.update!(read_restricted: false)
-            expect(Oneboxer.local_topic(url, route, opts)).to eq(topic)
-          end
-        end
-      end
-
-      context "when topic_id is provided" do
-        let(:opts) { { topic_id: topic.id, user_id: user.id } }
-
-        it "returns nil if the user cannot see the topic" do
-          topic.update!(category: Fabricate(:private_category, group: Fabricate(:group)))
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-        end
-
-        it "returns the topic if the user can see the topic" do
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(topic)
-        end
-
-        it "returns nil if the topic is a private message" do
-          topic.update!(archetype: Archetype.private_message, category: nil)
-          expect(Oneboxer.local_topic(url, route, opts)).to eq(nil)
-        end
-      end
-    end
-  end
 end

spec/lib/search_spec.rb

@@ -1988,7 +1988,7 @@ RSpec.describe Search do
 
       expect(
         Search
-          .execute("test created:@#{another_user.username}", guardian: Guardian.basic_user)
+          .execute("test created:@#{another_user.username}", guardian: Guardian.new())
           .posts
           .length,
       ).to eq(1)