FIX: crawler view with unicode usernames (#27051)

When "unicode_usernames" is enabled, calling the "user_path" helper with a username containing some non ASCII character will break due to the route constraint we have on username.

This fixes the issue by always encoding the username before passing it to the "user_path" helper.

Internal ref - t/127547

app/services/group_message.rb

@@ -78,7 +78,10 @@ class GroupMessage
       begin
         h = { base_url: Discourse.base_url }.merge(@opts[:message_params] || {})
         if @opts[:user]
-          h.merge!(username: @opts[:user].username, user_url: user_path(@opts[:user].username))
+          h.merge!(
+            username: @opts[:user].username,
+            user_url: user_path(@opts[:user].encoded_username(lower: true)),
+          )
         end
         h
       end

app/views/about/index.html.erb

@@ -14,8 +14,8 @@
   <div class='admins-list' itemscope itemtype='http://schema.org/ItemList'>
     <% @about.admins.each do |user| %>
       <div itemprop='itemListElement' itemscope itemtype='http://schema.org/ListItem'>
-        <meta itemprop='url' content='<%= user_path(user.username_lower) %>'>
-        <a href='<%= user_path(user.username_lower) %>' itemprop='item'>
+        <meta itemprop='url' content='<%= user_path(user.encoded_username(lower: true)) %>'>
+        <a href='<%= user_path(user.encoded_username(lower: true)) %>' itemprop='item'>
           <span itemprop='image'>
             <img width="45" height="45" class="avatar" src="<%= user.small_avatar_url %>">
           </span>
@@ -35,8 +35,8 @@
     <div class='moderators-list' itemscope itemtype='http://schema.org/ItemList'>
       <% @about.moderators.each do |user| %>
         <div itemprop='itemListElement' itemscope itemtype='http://schema.org/ListItem'>
-          <meta itemprop='url' content='<%= user_path(user.username_lower) %>'>
-          <a href='<%= user_path(user.username_lower) %>' itemprop='item'>
+          <meta itemprop='url' content='<%= user_path(user.encoded_username(lower: true)) %>'>
+          <a href='<%= user_path(user.encoded_username(lower: true)) %>' itemprop='item'>
             <span itemprop='image'>
               <img width="45" height="45" class="avatar" src="<%= user.small_avatar_url %>">
             </span>

spec/requests/about_controller_spec.rb

@@ -38,6 +38,14 @@ RSpec.describe AboutController do
         expect(response.status).to eq(200)
         expect(response.body).to include("/u/anadminuser")
       end
+
+      it "supports unicode usernames" do
+        SiteSetting.unicode_usernames = true
+        Fabricate(:admin, username: "martínez")
+        get "/about", headers: { "HTTP_USER_AGENT" => "Googlebot" }
+        expect(response.status).to eq(200)
+        expect(response.body).to include("/u/mart%25C3%25ADnez")
+      end
     end
 
     it "serializes stats when 'Guardian#can_see_about_stats?' is true" do

spec/services/group_message_spec.rb

@@ -7,8 +7,8 @@ RSpec.describe GroupMessage do
 
   let(:moderators_group) { Group[:moderators].name }
 
-  let!(:admin) { Fabricate.build(:admin, id: 999) }
-  let!(:user) { Fabricate.build(:user, id: 111) }
+  fab!(:admin)
+  fab!(:user)
 
   before { Discourse.stubs(:system_user).returns(admin) }
 
@@ -57,11 +57,10 @@ RSpec.describe GroupMessage do
   end
 
   describe "message_params" do
-    let(:user) { Fabricate.build(:user, id: 123_123) }
     shared_examples "common message params for group messages" do
       it "returns the correct params" do
         expect(message_params[:username]).to eq(user.username)
-        expect(message_params[:user_url]).to be_present
+        expect(message_params[:user_url]).to eq("/u/#{user.username}")
       end
     end
 
@@ -87,8 +86,6 @@ RSpec.describe GroupMessage do
       GroupMessage.new(moderators_group, :user_automatically_silenced, user: user)
     end
 
-    let(:user) { Fabricate.build(:user, id: 123_123) }
-
     before do
       PostCreator.stubs(:create).returns(stub_everything)
       group_message.stubs(:sent_recently_key).returns("the_key")