Merge branch 'fix-wiki-error-500' into 'master'

Fix Error 500 when creating Wiki pages with hyphens or spaces

- Closes gitlab-com/support-forum#874
- Closes #20209 

See merge request !5444

6 files changed, 190 insertions, 15 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 4c504d9895b..1dc1bdedf3f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -9,6 +9,7 @@ v 8.11.0 (unreleased)
 
 v 8.10.1 (unreleased)
  - Fix bug where replies to commit notes displayed in the MR discussion tab wouldn't show up on the commit page
+  - Fix Error 500 when creating Wiki pages with hyphens or spaces
 
 v 8.10.0
   - Fix profile activity heatmap to show correct day name (eanplatter)
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 3d5fd9d3ee9..c3de278f5b7 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -44,7 +44,11 @@ class WikiPage
 
   # The escaped URL path of this page.
   def slug
-    @attributes[:slug]
+    if @attributes[:slug].present?
+      @attributes[:slug]
+    else
+      wiki.wiki.preview_page(title, '', format).url_path
+    end
   end
 
   alias_method :to_param, :slug
diff --git a/app/views/layouts/project.html.haml b/app/views/layouts/project.html.haml
index d03d5e2ca6a..ee9c0366f2b 100644
--- a/app/views/layouts/project.html.haml
+++ b/app/views/layouts/project.html.haml
@@ -6,7 +6,7 @@
 - content_for :scripts_body_top do
   - project = @target_project || @project
   - if @project_wiki && @page
-    - markdown_preview_path = namespace_project_wiki_markdown_preview_path(project.namespace, project, @page.title)
+    - markdown_preview_path = namespace_project_wiki_markdown_preview_path(project.namespace, project, @page.slug)
   - else
     - markdown_preview_path = markdown_preview_namespace_project_path(project.namespace, project)
   - if current_user
diff --git a/features/steps/project/wiki.rb b/features/steps/project/wiki.rb
index 5ad82a9b3c1..732dc5d0b93 100644
--- a/features/steps/project/wiki.rb
+++ b/features/steps/project/wiki.rb
@@ -130,15 +130,15 @@ class Spinach::Features::ProjectWiki < Spinach::FeatureSteps
 
   step 'I create a New page with paths' do
     click_on 'New Page'
-    fill_in 'Page slug', with: 'one/two/three'
+    fill_in 'Page slug', with: 'one/two/three-test'
     click_on 'Create Page'
     fill_in "wiki_content", with: 'wiki content'
     click_on "Create page"
-    expect(current_path).to include 'one/two/three'
+    expect(current_path).to include 'one/two/three-test'
   end
 
   step 'I should see non-escaped link in the pages list' do
-    expect(page).to have_xpath("//a[@href='/#{project.path_with_namespace}/wikis/one/two/three']")
+    expect(page).to have_xpath("//a[@href='/#{project.path_with_namespace}/wikis/one/two/three-test']")
   end
 
   step 'I edit the Wiki page with a path' do
@@ -147,7 +147,7 @@ class Spinach::Features::ProjectWiki < Spinach::FeatureSteps
   end
 
   step 'I should see a non-escaped path' do
-    expect(current_path).to include 'one/two/three'
+    expect(current_path).to include 'one/two/three-test'
   end
 
   step 'I should see the Editing page' do
diff --git a/spec/features/projects/wiki/markdown_preview_spec.rb b/spec/features/projects/wiki/markdown_preview_spec.rb
new file mode 100644
index 00000000000..a1c386ddc18
--- /dev/null
+++ b/spec/features/projects/wiki/markdown_preview_spec.rb
@@ -0,0 +1,140 @@
+require 'spec_helper'
+
+feature 'Projects > Wiki > User previews markdown changes', feature: true, js: true do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, namespace: user.namespace) }
+  let(:wiki_content) do
+    <<-HEREDOC
+[regular link](regular)
+[relative link 1](../relative)
+[relative link 2](./relative)
+[relative link 3](./e/f/relative)
+    HEREDOC
+  end
+
+  background do
+    project.team << [user, :master]
+    login_as(user)
+
+    visit namespace_project_path(project.namespace, project)
+    click_link 'Wiki'
+    WikiPages::CreateService.new(project, user, title: 'home', content: 'Home page').execute
+  end
+
+  context "while creating a new wiki page" do
+    context "when there are no spaces or hyphens in the page name" do
+      it "rewrites relative links as expected" do
+        click_link 'New Page'
+        fill_in :new_wiki_path, with: 'a/b/c/d'
+        click_button 'Create Page'
+
+        fill_in :wiki_content, with: wiki_content
+        click_on "Preview"
+
+        expect(page).to have_content("regular link")
+
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/regular\">regular link</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a/b/relative\">relative link 1</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a/b/c/relative\">relative link 2</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a/b/c/e/f/relative\">relative link 3</a>")
+      end
+    end
+
+    context "when there are spaces in the page name" do
+      it "rewrites relative links as expected" do
+        click_link 'New Page'
+        fill_in :new_wiki_path, with: 'a page/b page/c page/d page'
+        click_button 'Create Page'
+
+        fill_in :wiki_content, with: wiki_content
+        click_on "Preview"
+
+        expect(page).to have_content("regular link")
+
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/regular\">regular link</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/relative\">relative link 1</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/relative\">relative link 2</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/e/f/relative\">relative link 3</a>")
+      end
+    end
+
+    context "when there are hyphens in the page name" do
+      it "rewrites relative links as expected" do
+        click_link 'New Page'
+        fill_in :new_wiki_path, with: 'a-page/b-page/c-page/d-page'
+        click_button 'Create Page'
+
+        fill_in :wiki_content, with: wiki_content
+        click_on "Preview"
+
+        expect(page).to have_content("regular link")
+
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/regular\">regular link</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/relative\">relative link 1</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/relative\">relative link 2</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/e/f/relative\">relative link 3</a>")
+      end
+    end
+  end
+
+  context "while editing a wiki page" do
+    def create_wiki_page(path)
+      click_link 'New Page'
+      fill_in :new_wiki_path, with: path
+      click_button 'Create Page'
+      fill_in :wiki_content, with: 'content'
+      click_on "Create page"
+    end
+
+    context "when there are no spaces or hyphens in the page name" do
+      it "rewrites relative links as expected" do
+        create_wiki_page 'a/b/c/d'
+        click_link 'Edit'
+
+        fill_in :wiki_content, with: wiki_content
+        click_on "Preview"
+
+        expect(page).to have_content("regular link")
+
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/regular\">regular link</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a/b/relative\">relative link 1</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a/b/c/relative\">relative link 2</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a/b/c/e/f/relative\">relative link 3</a>")
+      end
+    end
+
+    context "when there are spaces in the page name" do
+      it "rewrites relative links as expected" do
+        create_wiki_page 'a page/b page/c page/d page'
+        click_link 'Edit'
+
+        fill_in :wiki_content, with: wiki_content
+        click_on "Preview"
+
+        expect(page).to have_content("regular link")
+
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/regular\">regular link</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/relative\">relative link 1</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/relative\">relative link 2</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/e/f/relative\">relative link 3</a>")
+      end
+    end
+
+    context "when there are hyphens in the page name" do
+      it "rewrites relative links as expected" do
+        create_wiki_page 'a-page/b-page/c-page/d-page'
+        click_link 'Edit'
+
+        fill_in :wiki_content, with: wiki_content
+        click_on "Preview"
+
+        expect(page).to have_content("regular link")
+
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/regular\">regular link</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/relative\">relative link 1</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/relative\">relative link 2</a>")
+        expect(page.html).to include("<a href=\"/#{project.path_with_namespace}/wikis/a-page/b-page/c-page/e/f/relative\">relative link 3</a>")
+      end
+    end
+  end
+end
diff --git a/spec/features/projects/wiki/user_creates_wiki_page_spec.rb b/spec/features/projects/wiki/user_creates_wiki_page_spec.rb
index 7e6eef65873..7afd83b7250 100644
--- a/spec/features/projects/wiki/user_creates_wiki_page_spec.rb
+++ b/spec/features/projects/wiki/user_creates_wiki_page_spec.rb
@@ -30,18 +30,48 @@ feature 'Projects > Wiki > User creates wiki page', feature: true do
         WikiPages::CreateService.new(project, user, title: 'home', content: 'Home page').execute
       end
 
-      scenario 'via the "new wiki page" page', js: true do
-        click_link 'New Page'
+      context 'via the "new wiki page" page' do
+        scenario 'when the wiki page has a single word name', js: true do
+          click_link 'New Page'
 
-        fill_in :new_wiki_path, with: 'foo'
-        click_button 'Create Page'
+          fill_in :new_wiki_path, with: 'foo'
+          click_button 'Create Page'
 
-        fill_in :wiki_content, with: 'My awesome wiki!'
-        click_button 'Create page'
+          fill_in :wiki_content, with: 'My awesome wiki!'
+          click_button 'Create page'
 
-        expect(page).to have_content('Foo')
-        expect(page).to have_content("last edited by #{user.name}")
-        expect(page).to have_content('My awesome wiki!')
+          expect(page).to have_content('Foo')
+          expect(page).to have_content("last edited by #{user.name}")
+          expect(page).to have_content('My awesome wiki!')
+        end
+
+        scenario 'when the wiki page has spaces in the name', js: true do
+          click_link 'New Page'
+
+          fill_in :new_wiki_path, with: 'Spaces in the name'
+          click_button 'Create Page'
+
+          fill_in :wiki_content, with: 'My awesome wiki!'
+          click_button 'Create page'
+
+          expect(page).to have_content('Spaces in the name')
+          expect(page).to have_content("last edited by #{user.name}")
+          expect(page).to have_content('My awesome wiki!')
+        end
+
+        scenario 'when the wiki page has hyphens in the name', js: true do
+          click_link 'New Page'
+
+          fill_in :new_wiki_path, with: 'hyphens-in-the-name'
+          click_button 'Create Page'
+
+          fill_in :wiki_content, with: 'My awesome wiki!'
+          click_button 'Create page'
+
+          expect(page).to have_content('Hyphens in the name')
+          expect(page).to have_content("last edited by #{user.name}")
+          expect(page).to have_content('My awesome wiki!')
+        end
       end
     end
   end