keineahnung2345/global_wiki_redmine-4.1.1.patch

## global_wiki_redmine-4.1.1.patch
diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 4a88079..e7496fb 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -158,8 +158,10 @@ class AttachmentsController < ApplicationController
       @attachment.destroy
     end

+    container = @attachment.try(:container) || @container
     respond_to do |format|
-      format.html { redirect_to_referer_or project_path(@project) }
+      # redirect to project or global wiki page
+      format.html { redirect_to_referer_or @project ? project_path(@project) : wiki_index_path(container)}
       format.js
       format.api { render_api_ok }
     end
diff --git a/app/controllers/wiki_controller.rb b/app/controllers/wiki_controller.rb
index 423f94f..49c372f 100644
--- a/app/controllers/wiki_controller.rb
+++ b/app/controllers/wiki_controller.rb
@@ -33,7 +33,7 @@
 # TODO: still being worked on
 class WikiController < ApplicationController
   default_search_scope :wiki_pages
-  before_action :find_wiki, :authorize
+  before_action :find_wiki, :authorize_global
   before_action :find_existing_or_new_page, :only => [:show, :edit]
   before_action :find_existing_page, :only => [:rename, :protect, :history, :diff, :annotate, :add_attachment, :destroy, :destroy_version]
   before_action :find_attachments, :only => [:preview]
@@ -41,11 +41,13 @@ class WikiController < ApplicationController

   helper :attachments
   include AttachmentsHelper
+  include WikiHelper
   helper :watchers
   include Redmine::Export::PDF

   # List of pages, sorted alphabetically and by parent (hierarchy)
   def index
+    authorize if params[:project_id]
     load_pages_for_index

     respond_to do |format|
@@ -64,7 +66,7 @@ class WikiController < ApplicationController

   def new
     @page = WikiPage.new(:wiki => @wiki, :title => params[:title])
-    unless User.current.allowed_to?(:edit_wiki_pages, @project)
+    unless @wiki.allowed_to_permission?(:view_wiki_edits)
       render_403
       return
     end
@@ -72,7 +74,7 @@ class WikiController < ApplicationController
       @page.title = '' unless editable?
       @page.validate
       if @page.errors[:title].blank?
-        path = project_wiki_page_path(@project, @page.title, :parent => params[:parent])
+        path = wiki_page_action_path('show', @page, {:parent => params[:parent]})
         respond_to do |format|
           format.html { redirect_to path }
           format.js   { render :js => "window.location = #{path.to_json}" }
@@ -83,13 +85,13 @@ class WikiController < ApplicationController

   # display a page (in editing mode if it doesn't exist)
   def show
-    if params[:version] && !User.current.allowed_to?(:view_wiki_edits, @project)
+    if params[:version] && !@wiki.allowed_to_permission?(:view_wiki_edits)
       deny_access
       return
     end
     @content = @page.content_for_version(params[:version])
     if @content.nil?
-      if User.current.allowed_to?(:edit_wiki_pages, @project) && editable? && !api_request?
+      if @wiki.allowed_to_permission?(:view_wiki_edits) && editable? && !api_request?
         edit
         render :action => 'edit'
       else
@@ -185,11 +187,11 @@ class WikiController < ApplicationController
       respond_to do |format|
         format.html {
           anchor = @section ? "section-#{@section}" : nil
-          redirect_to project_wiki_page_path(@project, @page.title, :anchor => anchor)
+          redirect_to wiki_page_action_path('show', @page, {:anchor => anchor})
         }
         format.api {
           if was_new_page
-            render :action => 'show', :status => :created, :location => project_wiki_page_path(@project, @page.title)
+            render :action => 'show', :status => :created, :location => wiki_page_action_path('show', @page)
           else
             render_api_ok
           end
@@ -222,13 +224,13 @@ class WikiController < ApplicationController
     @page.safe_attributes = params[:wiki_page]
     if request.post? && @page.save
       flash[:notice] = l(:notice_successful_update)
-      redirect_to project_wiki_page_path(@page.project, @page.title)
+      redirect_to wiki_page_action_path('show', @page)
     end
   end

   def protect
     @page.update_attribute :protected, params[:protected]
-    redirect_to project_wiki_page_path(@project, @page.title)
+    redirect_to wiki_page_action_path('show', @page)
   end

   # show page history
@@ -284,7 +286,13 @@ class WikiController < ApplicationController
     end
     @page.destroy
     respond_to do |format|
-      format.html { redirect_to project_wiki_index_path(@project) }
+      format.html {
+        if @project
+          redirect_to project_wiki_index_path(@project)
+        else
+          redirect_to wiki_index_path
+        end
+      }
       format.api { render_api_ok }
     end
   end
@@ -294,7 +302,7 @@ class WikiController < ApplicationController

     if content = @page.content.versions.find_by_version(params[:version])
       content.destroy
-      redirect_to_referer_or history_project_wiki_page_path(@project, @page.title)
+      redirect_to_referer_or wiki_page_action_path('history', @page)
     else
       render_404
     end
@@ -339,13 +347,22 @@ class WikiController < ApplicationController
   private

   def find_wiki
-    @project = Project.find(params[:project_id])
-    @wiki = @project.wiki
+    if params[:project_id]
+      @project = Project.find(params[:project_id])
+      @wiki = @project.wiki
+    else
+      @wiki = Wiki.find_by(:project_id => nil)
+      Wiki.create(:project => nil, :start_page => 'Wiki') if @wiki.nil?
+    end
     render_404 unless @wiki
   rescue ActiveRecord::RecordNotFound
     render_404
   end

+  def global_wiki?
+    @wiki.project.nil?
+  end
+
   # Finds the requested page or a new page if it doesn't exist
   def find_existing_or_new_page
     @page = @wiki.find_or_new_page(params[:id])
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index e8284a0..c1f97a6 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -200,7 +200,7 @@ module ApplicationHelper
     'Project'      => -> (project)      { link_to_project(project) },
     'User'         => -> (user)         { link_to_user(user) },
     'Version'      => -> (version)      { link_to_version(version) },
-    'WikiPage'     => -> (wiki_page)    { link_to(wiki_page.pretty_title, project_wiki_page_path(wiki_page.project, wiki_page.title)) }
+    'WikiPage'     => -> (wiki_page)    { link_to(wiki_page.pretty_title, url_for({:controller => 'wiki', :action => 'show', project_id: wiki_page.project, id: wiki_page.title})) }
   }

   def link_to_record(record)
@@ -270,10 +270,6 @@ module ApplicationHelper
     end
   end

-  def wiki_page_path(page, options={})
-    url_for({:controller => 'wiki', :action => 'show', :project_id => page.project, :id => page.title}.merge(options))
-  end
-
   def thumbnail_tag(attachment)
     thumbnail_size = Setting.thumbnails_size.to_i
     link_to(
@@ -889,13 +885,14 @@ module ApplicationHelper
           next link_to(title.present? ? title.html_safe : h(page), url, :class => 'wiki-page')
         end

-        if page =~ /^([^\:]+)\:(.*)$/
+        if page =~ /^(.*)\:(.*)$/
           identifier, page = $1, $2
           link_project = Project.find_by_identifier(identifier) || Project.find_by_name(identifier)
           title ||= identifier if page.blank?
         end
-
-        if link_project && link_project.wiki && User.current.allowed_to?(:view_wiki_pages, link_project)
+        wiki = Wiki.find_by(:project => link_project)
+        if wiki && wiki.allowed_to_permission?(:view_wiki_pages) &&
+          (link_project || (wiki.global? && link_project.nil?))
           # extract anchor
           anchor = nil
           if page =~ /^(.+?)\#(.+)$/
@@ -903,7 +900,7 @@ module ApplicationHelper
           end
           anchor = sanitize_anchor_name(anchor) if anchor.present?
           # check if page exists
-          wiki_page = link_project.wiki.find_page(page)
+          wiki_page = wiki.find_page(page)
           url =
             if anchor.present? && wiki_page.present? &&
                  (obj.is_a?(WikiContent) || obj.is_a?(WikiContent::Version)) &&
diff --git a/app/helpers/wiki_helper.rb b/app/helpers/wiki_helper.rb
index 0a94073..1d777c0 100644
--- a/app/helpers/wiki_helper.rb
+++ b/app/helpers/wiki_helper.rb
@@ -56,15 +56,23 @@ module WikiHelper
   def wiki_page_edit_cancel_path(page)
     if page.new_record?
       if parent = page.parent
-        project_wiki_page_path(parent.project, parent.title)
+        wiki_page_action_path('show', parent)
       else
-        project_wiki_index_path(page.project)
+        if page.project
+          project_wiki_index_path(page.project)
+        else
+          wiki_index_path
+        end
       end
     else
-      project_wiki_page_path(page.project, page.title)
+      wiki_page_action_path('show', page)
     end
   end

+  def wiki_page_action_path(action_name, page=nil, options={})
+    url_for({:controller => 'wiki', :action => action_name, :project_id => (page.wiki.project if page), :id => (page.title if page)}.merge(options))
+  end
+
   def wiki_content_update_info(content)
     l(:label_updated_time_by, :author => link_to_user(content.author), :age => time_tag(content.updated_on)).html_safe
   end
diff --git a/app/models/wiki.rb b/app/models/wiki.rb
index ed4331f..f18b01b 100644
--- a/app/models/wiki.rb
+++ b/app/models/wiki.rb
@@ -34,7 +34,7 @@ class Wiki < ActiveRecord::Base
   safe_attributes 'start_page'

   def visible?(user=User.current)
-    !user.nil? && user.allowed_to?(:view_wiki_pages, project)
+    !user.nil? && user.allowed_to?(:view_wiki_pages, project, global: self.global?)
   end

   # Returns the wiki page that acts as the sidebar content
@@ -85,12 +85,13 @@ class Wiki < ActiveRecord::Base
   #   Wiki.find_page("foo:bar")
   def self.find_page(title, options = {})
     project = options[:project]
-    if title.to_s =~ %r{^([^\:]+)\:(.*)$}
+    if title.to_s =~ %r{^(.*):(.*)$}
       project_identifier, title = $1, $2
       project = Project.find_by_identifier(project_identifier) || Project.find_by_name(project_identifier)
     end
-    if project && project.wiki
-      page = project.wiki.find_page(title)
+    wiki = project_identifier.present? ? (project && project.wiki) : Wiki.find_by(project: nil)
+    if wiki
+      page = wiki.find_page(title)
       if page && page.content
         page
       end
@@ -105,4 +106,16 @@ class Wiki < ActiveRecord::Base
     title = (title.slice(0..0).upcase + (title.slice(1..-1) || '')) if title
     title
   end
+
+  def global?
+    self.project.nil?
+  end
+
+  def allowed_to_permission?(permission, user=User.current)
+    user.allowed_to?(permission, self.project, :global => self.global?)
+  end
+
+  def allowed_to_action?(action)
+    User.current.allowed_to?({:controller => 'wiki', :action => action}, self.project, :global => self.global?)
+  end
 end
diff --git a/app/models/wiki_content.rb b/app/models/wiki_content.rb
index d38c5ca..82dc458 100644
--- a/app/models/wiki_content.rb
+++ b/app/models/wiki_content.rb
@@ -53,7 +53,7 @@ class WikiContent < ActiveRecord::Base
   end

   def notified_users
-    project.notified_users.reject {|user| !visible?(user)}
+    self.global? ? [] : project.notified_users.reject {|user| !visible?(user)}
   end

   # Returns the mail addresses of users that should be notified
@@ -79,6 +79,10 @@ class WikiContent < ActiveRecord::Base
     end
   end

+  def global?
+    self.project.nil?
+  end
+
   private

   def create_version
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index c4da80f..6a139f0 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -62,10 +62,10 @@ class WikiPage < ActiveRecord::Base
   DEFAULT_PROTECTED_PAGES = %w(sidebar)

   safe_attributes 'parent_id', 'parent_title', 'title', 'redirect_existing_links', 'wiki_id',
-                  :if => lambda {|page, user| page.new_record? || user.allowed_to?(:rename_wiki_pages, page.project)}
+    :if => lambda {|page, user| page.new_record? || user.allowed_to?(:rename_wiki_pages, page.project, global: page.wiki.global?)}

   safe_attributes 'is_start_page',
-                  :if => lambda {|page, user| user.allowed_to?(:manage_wiki, page.project)}
+    :if => lambda {|page, user| user.allowed_to?(:manage_wiki, page.project, global: page.wiki.global?)}

   safe_attributes 'deleted_attachment_ids',
                   :if => lambda {|page, user| page.attachments_deletable?(user)}
@@ -78,7 +78,13 @@ class WikiPage < ActiveRecord::Base
   end

   def visible?(user=User.current)
-    !user.nil? && user.allowed_to?(:view_wiki_pages, project)
+    !user.nil? &&
+      user.allowed_to?(:view_wiki_pages, self.project, global: self.wiki.global?)
+  end
+
+  def attachments_visible?(user=User.current)
+    (respond_to?(:visible?) ? visible?(user) : true) &&
+      user.allowed_to?(self.class.attachable_options[:view_permission], self.project, global: self.wiki.global?)
   end

   def title=(value)
@@ -203,7 +209,7 @@ class WikiPage < ActiveRecord::Base

   # Returns true if usr is allowed to edit the page, otherwise false
   def editable_by?(usr)
-    !protected? || usr.allowed_to?(:protect_wiki_pages, wiki.project)
+    !protected? || self.wiki.allowed_to_permission?(:protect_wiki_pages, usr)
   end

   def attachments_deletable?(usr=User.current)
diff --git a/app/views/wiki/_new_modal.html.erb b/app/views/wiki/_new_modal.html.erb
index 108c6ad..02f014b 100644
--- a/app/views/wiki/_new_modal.html.erb
+++ b/app/views/wiki/_new_modal.html.erb
@@ -1,7 +1,7 @@
 <h3 class="title"><%=l(:label_wiki_page_new)%></h3>

 <%= labelled_form_for :page, @page,
-            :url => new_project_wiki_page_path(@project),
+            :url => wiki_page_action_path('new', @page),
             :method => 'post',
             :remote => true do |f| %>

diff --git a/app/views/wiki/annotate.html.erb b/app/views/wiki/annotate.html.erb
index 1b48f5d..7738c80 100644
--- a/app/views/wiki/annotate.html.erb
+++ b/app/views/wiki/annotate.html.erb
@@ -6,8 +6,8 @@

 <%= wiki_page_breadcrumb(@page) %>

-<%= title [@page.pretty_title, project_wiki_page_path(@page.project, @page.title, :version => nil)],
-      [l(:label_history), history_project_wiki_page_path(@page.project, @page.title)],
+<%= title [@page.pretty_title, wiki_page_action_path('show', @page, {:version => nil})],
+      [l(:label_history), wiki_page_action_path('history', @page)],
       "#{l(:label_version)} #{@annotate.content.version}" %>

 <p>
diff --git a/app/views/wiki/date_index.html.erb b/app/views/wiki/date_index.html.erb
index 274f19a..f4975f6 100644
--- a/app/views/wiki/date_index.html.erb
+++ b/app/views/wiki/date_index.html.erb
@@ -1,6 +1,6 @@
 <div class="contextual">
 <% if User.current.allowed_to?(:edit_wiki_pages, @project) %>
-<%= link_to l(:label_wiki_page_new), new_project_wiki_page_path(@project), :remote => true, :class => 'icon icon-add' %>
+<%= link_to l(:label_wiki_page_new), wiki_page_action_path('new', @page), :remote => true, :class => 'icon icon-add' %>
 <% end %>
 <%= watcher_link(@wiki, User.current) %>
 <% if User.current.allowed_to?(:manage_wiki, @project) %>
diff --git a/app/views/wiki/diff.html.erb b/app/views/wiki/diff.html.erb
index 765e51a..153af89 100644
--- a/app/views/wiki/diff.html.erb
+++ b/app/views/wiki/diff.html.erb
@@ -5,8 +5,8 @@

 <%= wiki_page_breadcrumb(@page) %>

-<%= title [@page.pretty_title, project_wiki_page_path(@page.project, @page.title, :version => nil)],
-      [l(:label_history), history_project_wiki_page_path(@page.project, @page.title)],
+<%= title [@page.pretty_title, wiki_page_action_path('show', @page, {:version => nil})],
+      [l(:label_history), wiki_page_action_path('history', @page)],
       "#{l(:label_revision)} #{@diff.content_to.version}" %>

 <p>
diff --git a/app/views/wiki/edit.html.erb b/app/views/wiki/edit.html.erb
index 0e1c23c..a86a1e9 100644
--- a/app/views/wiki/edit.html.erb
+++ b/app/views/wiki/edit.html.erb
@@ -64,7 +64,7 @@
   <%= submit_tag l(:button_save) %>
   <%= link_to l(:button_cancel), wiki_page_edit_cancel_path(@page) %>
  </p>
-<%= wikitoolbar_for 'content_text', preview_project_wiki_page_path(:project_id => @project, :id => @page.title) %>
+<%= wikitoolbar_for 'content_text', wiki_page_action_path('preview', @page) %>
 <% end %>

 <% content_for :header_tags do %>
diff --git a/app/views/wiki/history.html.erb b/app/views/wiki/history.html.erb
index 3e638a8..dea9c58 100644
--- a/app/views/wiki/history.html.erb
+++ b/app/views/wiki/history.html.erb
@@ -1,6 +1,6 @@
 <%= wiki_page_breadcrumb(@page) %>

-<%= title [@page.pretty_title, project_wiki_page_path(@page.project, @page.title, :version => nil)], l(:label_history) %>
+<%= title [@page.pretty_title, wiki_page_action_path('show', @page, {:version => nil})], l(:label_history) %>

 <%= form_tag({:controller => 'wiki', :action => 'diff',
               :project_id => @page.project, :id => @page.title},
@@ -31,7 +31,7 @@
     <td class="comments"><%= ver.comments %></td>
     <td class="buttons">
       <%= link_to l(:button_annotate), :action => 'annotate', :id => @page.title, :version => ver.version %>
-      <%= delete_link wiki_page_path(@page, :version => ver.version) if User.current.allowed_to?(:delete_wiki_pages, @page.project) && @version_count > 1 %>
+      <%= delete_link wiki_page_action_path('show', @page, {:version => ver.version}) if @page.wiki.allowed_to_permission?(:delete_wiki_pages) && @version_count > 1 %>
     </td>
 </tr>
 <% line_num += 1 %>
diff --git a/app/views/wiki/index.html.erb b/app/views/wiki/index.html.erb
index bb60868..df8234f 100644
--- a/app/views/wiki/index.html.erb
+++ b/app/views/wiki/index.html.erb
@@ -1,6 +1,6 @@
 <div class="contextual">
 <% if User.current.allowed_to?(:edit_wiki_pages, @project) %>
-<%= link_to l(:label_wiki_page_new), new_project_wiki_page_path(@project), :remote => true, :class => 'icon icon-add' %>
+<%= link_to l(:label_wiki_page_new), wiki_page_action_path('new'), :remote => true, :class => 'icon icon-add' %>
 <% end %>
 <%= watcher_link(@wiki, User.current) %>
 <% if User.current.allowed_to?(:manage_wiki, @project) %>
diff --git a/app/views/wiki/new.html.erb b/app/views/wiki/new.html.erb
index d067420..1ad2f78 100644
--- a/app/views/wiki/new.html.erb
+++ b/app/views/wiki/new.html.erb
@@ -1,7 +1,7 @@
 <%= title l(:label_wiki_page_new) %>

 <%= labelled_form_for :page, @page,
-            :url => new_project_wiki_page_path(@project) do |f| %>
+            :url => wiki_page_action_path('new', @page) do |f| %>

   <%= render_error_messages @page.errors.full_messages_for(:title) %>

diff --git a/app/views/wiki/rename.html.erb b/app/views/wiki/rename.html.erb
index 13fb41a..46e9295 100644
--- a/app/views/wiki/rename.html.erb
+++ b/app/views/wiki/rename.html.erb
@@ -13,7 +13,7 @@
 <p><%= f.check_box :is_start_page, :label => :field_start_page, :disabled => @page.is_start_page %></p>
 <% end %>
 <p><%= f.check_box :redirect_existing_links %></p>
-<% if @page.safe_attribute? 'wiki_id' %>
+<% if @page.safe_attribute? 'wiki_id' && !@page.wiki.global? %>
 <p><%= f.select :wiki_id, wiki_page_wiki_options_for_select(@page), :label => :label_project %></p>
 <% end %>
 <p><%= f.select :parent_id,
@@ -30,7 +30,7 @@
 <%= javascript_tag do %>
 $('#wiki_page_wiki_id').change(function() {
   $.ajax({
-    url: '<%= rename_project_wiki_page_path(@wiki, :format => 'js') %>',
+    url: '<%= wiki_page_action_path('rename', @page, {:format => 'js'}) %>',
     type: 'get',
     data: { 'wiki_page[wiki_id]': $('#wiki_page_wiki_id').val() }
   });
diff --git a/app/views/wiki/show.html.erb b/app/views/wiki/show.html.erb
index a710496..856793f 100644
--- a/app/views/wiki/show.html.erb
+++ b/app/views/wiki/show.html.erb
@@ -2,27 +2,27 @@

 <% if @editable %>
 <% if @content.current_version? %>
-  <%= link_to_if_authorized(l(:button_edit), {:action => 'edit', :id => @page.title}, :class => 'icon icon-edit', :accesskey => accesskey(:edit)) %>
+  <%= link_to(l(:button_edit), {:action => 'edit', :id => @page.title}, :class => 'icon icon-edit', :accesskey => accesskey(:edit)) if @page.wiki.allowed_to_action?('edit') %>
   <%= watcher_link(@page, User.current) %>
 <% end %>
 <% end %>

   <%= actions_dropdown do %>
-    <%= link_to_if_authorized(l(:label_history), {:action => 'history', :id => @page.title}, :class => 'icon icon-history') %>
+    <%= link_to(l(:label_history), {:action => 'history', :id => @page.title}, :class => 'icon icon-history') if @page.wiki.allowed_to_action?('history') %>

     <% if @editable %>
     <% if @content.current_version? %>
-      <%= link_to_if_authorized(l(:button_lock), {:action => 'protect', :id => @page.title, :protected => 1}, :method => :post, :class => 'icon icon-lock') if !@page.protected? %>
-      <%= link_to_if_authorized(l(:button_unlock), {:action => 'protect', :id => @page.title, :protected => 0}, :method => :post, :class => 'icon icon-unlock') if @page.protected? %>
-      <%= link_to_if_authorized(l(:button_rename), {:action => 'rename', :id => @page.title}, :class => 'icon icon-move') %>
-      <%= link_to_if_authorized(l(:button_delete), {:action => 'destroy', :id => @page.title}, :method => :delete, :data => {:confirm => l(:text_are_you_sure)}, :class => 'icon icon-del') %>
+      <%= link_to(l(:button_lock), {:action => 'protect', :id => @page.title, :protected => 1}, :method => :post, :class => 'icon icon-lock') if !@page.protected? && @page.wiki.allowed_to_action?('protect') %>
+      <%= link_to(l(:button_unlock), {:action => 'protect', :id => @page.title, :protected => 0}, :method => :post, :class => 'icon icon-unlock') if @page.protected? && @page.wiki.allowed_to_action?('protect') %>
+      <%= link_to(l(:button_rename), {:action => 'rename', :id => @page.title}, :class => 'icon icon-move') if @page.wiki.allowed_to_action?('rename') %>
+      <%= link_to(l(:button_delete), {:action => 'destroy', :id => @page.title}, :method => :delete, :data => {:confirm => l(:text_are_you_sure)}, :class => 'icon icon-del') if @page.wiki.allowed_to_action?('destroy') %>
     <% else %>
-      <%= link_to_if_authorized(l(:button_rollback), {:action => 'edit', :id => @page.title, :version => @content.version }, :class => 'icon icon-cancel') %>
+      <%= link_to(l(:button_rollback), {:action => 'edit', :id => @page.title, :version => @content.version }, :class => 'icon icon-cancel') if @page.wiki.allowed_to_action?('edit') %>
     <% end %>
     <% end %>

-    <% if User.current.allowed_to?(:edit_wiki_pages, @project) %>
-      <%= link_to l(:label_wiki_page_new), new_project_wiki_page_path(@project, :parent => @page.title), :remote => true, :class => 'icon icon-add' %>
+    <% if @page.wiki.allowed_to_permission?(:edit_wiki_pages) %>
+      <%= link_to l(:label_wiki_page_new), wiki_page_action_path('new', @page, {:parent => @page.title}), :remote => true, :class => 'icon icon-add' %>
     <% end %>
   <% end %>
 </div>
@@ -30,8 +30,8 @@
 <%= wiki_page_breadcrumb(@page) %>

 <% unless @content.current_version? %>
-  <%= title [@page.pretty_title, project_wiki_page_path(@page.project, @page.title, :version => nil)],
-        [l(:label_history), history_project_wiki_page_path(@page.project, @page.title)],
+  <%= title [@page.pretty_title, wiki_page_action_path('show', @page, {:version => nil})],
+        [l(:label_history), wiki_page_action_path('history', @page)],
         "#{l(:label_revision)} #{@content.version}" %>

     <p>
diff --git a/config/routes.rb b/config/routes.rb
index d8e5fd7..68f316f 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -183,6 +183,30 @@ Rails.application.routes.draw do
     get 'wiki/:id/:version/annotate', :to => 'wiki#annotate'
     get 'wiki/:id/:version/diff', :to => 'wiki#diff'
   end
+  match 'wiki/index', :controller => 'wiki', :action => 'index', :via => :get
+  resources :wiki, :except => [:index, :create, :show], :as => 'wiki_page' do
+    member do
+      get 'wiki', :as => 'show_wiki_page'
+      get 'rename'
+      post 'rename'
+      get 'history'
+      get 'diff'
+      match 'preview', :via => [:post, :put, :patch]
+      post 'protect'
+      post 'add_attachment'
+    end
+    collection do
+      get 'export'
+      get 'date_index'
+      post 'new'
+    end
+  end
+  match 'wiki', :controller => 'wiki', :action => 'show', :via => :get
+  get 'wiki/:id/:version', :to => 'wiki#show', :constraints => {:version => /\d+/}
+  delete 'wiki/:id/:version', :to => 'wiki#destroy_version'
+  get 'wiki/:id/:version/annotate', :to => 'wiki#annotate'
+  get 'wiki/:id/:version/diff', :to => 'wiki#diff'
+  match 'wiki/:id/destroy', :to => 'wikis#destroy', :via => [:get, :post]

   resources :issues do
     member do
diff --git a/db/migrate/20200729083854_allow_wiki_project_id_to_be_nil.rb b/db/migrate/20200729083854_allow_wiki_project_id_to_be_nil.rb
new file mode 100644
index 0000000..7312d08
--- /dev/null
+++ b/db/migrate/20200729083854_allow_wiki_project_id_to_be_nil.rb
@@ -0,0 +1,8 @@
+class AllowWikiProjectIdToBeNil < ActiveRecord::Migration[5.2]
+  def up
+   change_column_null :wikis, :project_id, true
+  end
+  def down
+    change_column_null :wikis, :project_id, false
+  end
+end
diff --git a/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb b/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
index 4df4b6a..3ca03a3 100644
--- a/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
+++ b/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
@@ -58,7 +58,7 @@ module Redmine

         def attachments_deletable?(user=User.current)
           (respond_to?(:visible?) ? visible?(user) : true) &&
-            user.allowed_to?(self.class.attachable_options[:delete_permission], self.project)
+            user.allowed_to?(self.class.attachable_options[:delete_permission], self.project, :global => ((self.is_a? WikiPage) ? self.wiki.global?: false))
         end

         def saved_attachments
diff --git a/lib/plugins/acts_as_searchable/lib/acts_as_searchable.rb b/lib/plugins/acts_as_searchable/lib/acts_as_searchable.rb
index 83fa394..6ff8347 100644
--- a/lib/plugins/acts_as_searchable/lib/acts_as_searchable.rb
+++ b/lib/plugins/acts_as_searchable/lib/acts_as_searchable.rb
@@ -196,6 +196,22 @@ module Redmine

             if projects
               scope = scope.where("#{searchable_options[:project_key]} IN (?)", projects.map(&:id))
+            elsif scope.table_name == "wiki_pages" && options[:params][:wiki_pages] == "1"
+              # including global wiki
+              scope_global_wikis = WikiPage.joins(:wiki).where("wikis.project_id is null")
+              # Method 1:
+              # ArgumentError (Relation passed to #or must be structurally compatible. Incompatible values: [:joins])
+              #scope = scope.or(scope_global_wikis)
+              # Method 2:
+              # TypeError (Cannot visit WikiPage::ActiveRecord_Relation)
+              #wiki_page_table = WikiPage.arel_table
+              #combined = Arel::Nodes::UnionAll.new(scope, scope_global_wikis)
+              #scope = WikiPage.from(Arel::Nodes::As.new(combined, wiki_page_table))
+              # Method 3:
+              # https://stackoverflow.com/questions/57491185/obtain-union-all-result-in-activerecord
+              # https://stackoverflow.com/questions/17331862/converting-an-array-of-objects-to-activerecordrelation
+              scope_array = WikiPage.find_by_sql("#{scope.to_sql} UNION #{scope_global_wikis.to_sql}")
+              scope = WikiPage.where(id: scope_array.map(&:id)).joins(:content) #.joins({:wiki => :project})
             end
             scope
           end
diff --git a/lib/redmine.rb b/lib/redmine.rb
index 9ecca63..58da75b 100644
--- a/lib/redmine.rb
+++ b/lib/redmine.rb
@@ -242,6 +242,15 @@ Redmine::MenuManager.map :application_menu do |menu|
                        EnabledModule.exists?(:project => Project.visible, :name => :news)
                    },
             :caption => :label_news_plural
+  menu.push(
+    :wiki,
+    {:controller => 'wiki', :action => 'show'},
+    :if =>
+      Proc.new do
+        User.current.allowed_to?(:view_wiki_pages, nil, :global => true)
+      end,
+    :caption => :label_wiki
+  )
 end

 Redmine::MenuManager.map :admin_menu do |menu|
diff --git a/lib/redmine/wiki_formatting/macros.rb b/lib/redmine/wiki_formatting/macros.rb
index 99eac68..c2d03b7 100644
--- a/lib/redmine/wiki_formatting/macros.rb
+++ b/lib/redmine/wiki_formatting/macros.rb
@@ -205,7 +205,7 @@ module Redmine
         else
           raise 'With no argument, this macro can be called from wiki pages only.'
         end
-        raise 'Page not found' if page.nil? || !User.current.allowed_to?(:view_wiki_pages, page.wiki.project)
+        raise 'Page not found' if page.nil? || !User.current.allowed_to?(:view_wiki_pages, page.wiki.project, global: page.wiki.global?)
         pages = page.self_and_descendants(options[:depth]).group_by(&:parent_id)
         render_page_hierarchy(pages, options[:parent] ? page.parent_id : page.id)
       end
@@ -215,7 +215,7 @@ module Redmine
              "{{include(projectname:Foo)}} -- to include a page of a specific project wiki"
       macro :include do |obj, args|
         page = Wiki.find_page(args.first.to_s, :project => @project)
-        raise 'Page not found' if page.nil? || !User.current.allowed_to?(:view_wiki_pages, page.wiki.project)
+        raise 'Page not found' if page.nil? || !User.current.allowed_to?(:view_wiki_pages, page.wiki.project, global: page.wiki.global?)
         @included_wiki_pages ||= []
         raise 'Circular inclusion detected' if @included_wiki_pages.include?(page.id)
         @included_wiki_pages << page.id