Support remote follow request providing URL instead of acct

app/assets/stylesheets/accounts.scss

@@ -337,6 +337,10 @@
     overflow: hidden;
     margin-bottom: 15px;
 
+    &:last-child {
+      margin-bottom: 0;
+    }
+
     & > div {
       float: left;
       margin-right: 10px;

app/controllers/authorize_follow_controller.rb

@@ -6,7 +6,14 @@ class AuthorizeFollowController < ApplicationController
   before_action :authenticate_user!
 
   def new
-    @account = FollowRemoteAccountService.new.call(params[:acct])
+    uri = Addressable::URI.parse(params[:acct])
+
+    if uri.path && %w(http https).include?(uri.scheme)
+      set_account_from_url
+    else
+      set_account_from_acct
+    end
+
     render :error if @account.nil?
   end
 
@@ -21,4 +28,14 @@ class AuthorizeFollowController < ApplicationController
   rescue ActiveRecord::RecordNotFound, Mastodon::NotPermitted
     render :error
   end
+
+  private
+
+  def set_account_from_url
+    @account = FetchRemoteAccountService.new.call(params[:acct])
+  end
+
+  def set_account_from_acct
+    @account = FollowRemoteAccountService.new.call(params[:acct])
+  end
 end

app/views/authorize_follow/new.html.haml

@@ -14,7 +14,8 @@
           %strong= display_name(@account)
           %span= "@#{@account.acct}"
 
-      .account__header__content= Formatter.instance.simplified_format(@account)
+      - unless @account.note.blank?
+        .account__header__content= Formatter.instance.simplified_format(@account)
 
   = form_tag authorize_follow_path, method: :post, class: 'simple_form' do
     = hidden_field_tag :acct, @account.acct