From 06663fcf87fe0d6bc71336e6f212b82f098066d7 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Wed, 13 Mar 2019 13:02:13 +0100
Subject: [PATCH] Fix `tagged` param not being normalized before querying tags
 (#10249)

---
 app/controllers/accounts_controller.rb                 | 8 +++++++-
 app/controllers/api/v1/accounts/statuses_controller.rb | 8 +++++++-
 app/controllers/api/v1/timelines/tag_controller.rb     | 2 +-
 app/controllers/tags_controller.rb                     | 2 +-
 app/models/tag.rb                                      | 8 ++++++++
 5 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index cad2ecf3fea..dfbe5bffcf3 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -80,7 +80,13 @@ class AccountsController < ApplicationController
   end
 
   def hashtag_scope
-    Status.tagged_with(Tag.find_by(name: params[:tag].downcase)&.id)
+    tag = Tag.find_normalized(params[:tag])
+
+    if tag
+      Status.tagged_with(tag.id)
+    else
+      Status.none
+    end
   end
 
   def set_account
diff --git a/app/controllers/api/v1/accounts/statuses_controller.rb b/app/controllers/api/v1/accounts/statuses_controller.rb
index ed10f3f6a7e..8cd8f8e7996 100644
--- a/app/controllers/api/v1/accounts/statuses_controller.rb
+++ b/app/controllers/api/v1/accounts/statuses_controller.rb
@@ -69,7 +69,13 @@ class Api::V1::Accounts::StatusesController < Api::BaseController
   end
 
   def hashtag_scope
-    Status.tagged_with(Tag.find_by(name: params[:tagged])&.id)
+    tag = Tag.find_normalized(params[:tagged])
+
+    if tag
+      Status.tagged_with(tag.id)
+    else
+      Status.none
+    end
   end
 
   def pagination_params(core_params)
diff --git a/app/controllers/api/v1/timelines/tag_controller.rb b/app/controllers/api/v1/timelines/tag_controller.rb
index 92c32c1784b..9adc4ad2912 100644
--- a/app/controllers/api/v1/timelines/tag_controller.rb
+++ b/app/controllers/api/v1/timelines/tag_controller.rb
@@ -14,7 +14,7 @@ class Api::V1::Timelines::TagController < Api::BaseController
   private
 
   def load_tag
-    @tag = Tag.find_by(name: params[:id].downcase)
+    @tag = Tag.find_normalized(params[:id])
   end
 
   def load_statuses
diff --git a/app/controllers/tags_controller.rb b/app/controllers/tags_controller.rb
index 729553e1e7f..66b18490117 100644
--- a/app/controllers/tags_controller.rb
+++ b/app/controllers/tags_controller.rb
@@ -9,7 +9,7 @@ class TagsController < ApplicationController
   before_action :set_instance_presenter
 
   def show
-    @tag = Tag.find_by!(name: params[:id].downcase)
+    @tag = Tag.find_normalized!(params[:id])
 
     respond_to do |format|
       format.html do
diff --git a/app/models/tag.rb b/app/models/tag.rb
index 788a678bdee..7db76d157b0 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -72,6 +72,14 @@ class Tag < ApplicationRecord
          .limit(limit)
          .offset(offset)
     end
+
+    def find_normalized(name)
+      find_by(name: name.mb_chars.downcase.to_s)
+    end
+
+    def find_normalized!(name)
+      find_normalized(name) || raise(ActiveRecord::RecordNotFound)
+    end
   end
 
   private