require 'spec_helper'
require 'nokogiri'

module Gitlab
  describe Asciidoc do
    include FakeBlobHelpers

    before do
      allow_any_instance_of(ApplicationSetting).to receive(:current).and_return(::ApplicationSetting.create_from_defaults)
    end

    context "without project" do
      let(:input) { '<b>ascii</b>' }
      let(:context) { {} }
      let(:html) { 'H<sub>2</sub>O' }

      it "converts the input using Asciidoctor and default options" do
        expected_asciidoc_opts = {
            safe: :secure,
            backend: :gitlab_html5,
            attributes: described_class::DEFAULT_ADOC_ATTRS,
            extensions: be_a(Proc)
        }

        expect(Asciidoctor).to receive(:convert)
          .with(input, expected_asciidoc_opts).and_return(html)

        expect(render(input, context)).to eq(html)
      end

      context "with asciidoc_opts" do
        it "merges the options with default ones" do
          expected_asciidoc_opts = {
              safe: :secure,
              backend: :gitlab_html5,
              attributes: described_class::DEFAULT_ADOC_ATTRS,
              extensions: be_a(Proc)
          }

          expect(Asciidoctor).to receive(:convert)
            .with(input, expected_asciidoc_opts).and_return(html)

          render(input, context)
        end
      end

      context "XSS" do
        links = {
          'links' => {
            input: 'link:mylink"onmouseover="alert(1)[Click Here]',
            output: "<div>\n<p><a href=\"mylink\">Click Here</a></p>\n</div>"
          },
          'images' => {
            input: 'image:https://localhost.com/image.png[Alt text" onerror="alert(7)]',
            output: "<div>\n<p><span><img src=\"https://localhost.com/image.png\" alt='Alt text\" onerror=\"alert(7)'></span></p>\n</div>"
          },
          'pre' => {
            input: '```mypre"><script>alert(3)</script>',
            output: "<div>\n<div>\n<pre lang=\"mypre\">\"&gt;<code></code></pre>\n</div>\n</div>"
          }
        }

        links.each do |name, data|
          it "does not convert dangerous #{name} into HTML" do
            expect(render(data[:input], context)).to include(data[:output])
          end
        end
      end

      context 'external links' do
        it 'adds the `rel` attribute to the link' do
          output = render('link:https://google.com[Google]', context)

          expect(output).to include('rel="nofollow noreferrer noopener"')
        end
      end

      context 'LaTex code' do
        it 'adds class js-render-math to the output' do
          input = <<~MD
            :stem: latexmath

            [stem]
            ++++
            \sqrt{4} = 2
            ++++

            another part

            [latexmath]
            ++++
            \beta_x \gamma
            ++++

            stem:[2+2] is 4
            MD

          expect(render(input, context)).to include('<pre data-math-style="display" class="code math js-render-math"><code>eta_x gamma</code></pre>')
          expect(render(input, context)).to include('<p><code data-math-style="inline" class="code math js-render-math">2+2</code> is 4</p>')
        end
      end

      context 'outfilesuffix' do
        it 'defaults to adoc' do
          output = render("Inter-document reference <<README.adoc#>>", context)

          expect(output).to include("a href=\"README.adoc\"")
        end
      end
    end

    context 'with project' do
      let(:context) do
        {
          commit:         commit,
          project:        project,
          ref:            ref,
          requested_path: requested_path
        }
      end
      let(:commit)         { project.commit(ref) }
      let(:project)        { create(:project, :repository) }
      let(:ref)            { 'asciidoc' }
      let(:requested_path) { '/' }

      context 'include directive' do
        subject(:output) { render(input, context) }

        let(:input) { "Include this:\n\ninclude::#{include_path}[]" }

        before do
          current_file = requested_path
          current_file += 'README.adoc' if requested_path.end_with? '/'

          create_file(current_file, "= AsciiDoc\n")
        end

        context 'with path to non-existing file' do
          let(:include_path) { 'not-exists.adoc' }

          it 'renders Unresolved directive placeholder' do
            is_expected.to include("<strong>[ERROR: include::#{include_path}[] - unresolved directive]</strong>")
          end
        end

        shared_examples :invalid_include do
          let(:include_path) { 'dk.png' }

          before do
            allow(project.repository).to receive(:blob_at).and_return(blob)
          end

          it 'does not read the blob' do
            expect(blob).not_to receive(:data)
          end

          it 'renders Unresolved directive placeholder' do
            is_expected.to include("<strong>[ERROR: include::#{include_path}[] - unresolved directive]</strong>")
          end
        end

        context 'with path to a binary file' do
          let(:blob) { fake_blob(path: 'dk.png', binary: true) }
          include_examples :invalid_include
        end

        context 'with path to file in external storage' do
          let(:blob) { fake_blob(path: 'dk.png', lfs: true) }

          before do
            allow(Gitlab.config.lfs).to receive(:enabled).and_return(true)
            project.update_attribute(:lfs_enabled, true)
          end

          include_examples :invalid_include
        end

        context 'with path to a textual file' do
          let(:include_path) { 'sample.adoc' }

          before do
            create_file(file_path, "Content from #{include_path}")
          end

          shared_examples :valid_include do
            [
              ['/doc/sample.adoc',  'doc/sample.adoc',     'absolute path'],
              ['sample.adoc',       'doc/api/sample.adoc', 'relative path'],
              ['./sample.adoc',     'doc/api/sample.adoc', 'relative path with leading ./'],
              ['../sample.adoc',    'doc/sample.adoc',     'relative path to a file up one directory'],
              ['../../sample.adoc', 'sample.adoc',         'relative path for a file up multiple directories']
            ].each do |include_path_, file_path_, desc|

              context "the file is specified by #{desc}" do
                let(:include_path) { include_path_ }
                let(:file_path) { file_path_ }

                it 'includes content of the file' do
                  is_expected.to include('<p>Include this:</p>')
                  is_expected.to include("<p>Content from #{include_path}</p>")
                end
              end
            end
          end

          context 'when requested path is a file in the repo' do
            let(:requested_path) { 'doc/api/README.adoc' }

            include_examples :valid_include

            context 'without a commit (only ref)' do
              let(:commit) { nil }
              include_examples :valid_include
            end
          end

          context 'when requested path is a directory in the repo' do
            let(:requested_path) { 'doc/api/' }

            include_examples :valid_include

            context 'without a commit (only ref)' do
              let(:commit) { nil }
              include_examples :valid_include
            end
          end
        end

        context 'recursive includes with relative paths' do
          let(:input) do
            <<~ADOC
              Source: requested file

              include::doc/README.adoc[]

              include::license.adoc[]
            ADOC
          end

          before do
            create_file 'doc/README.adoc', <<~ADOC
              Source: doc/README.adoc

              include::../license.adoc[]

              include::api/hello.adoc[]
            ADOC
            create_file 'license.adoc', <<~ADOC
              Source: license.adoc
            ADOC
            create_file 'doc/api/hello.adoc', <<~ADOC
              Source: doc/api/hello.adoc

              include::./common.adoc[]
            ADOC
            create_file 'doc/api/common.adoc', <<~ADOC
              Source: doc/api/common.adoc
            ADOC
          end

          it 'includes content of the included files recursively' do
            expect(output.gsub(/<[^>]+>/, '').gsub(/\n\s*/, "\n").strip).to eq <<~ADOC.strip
              Source: requested file
              Source: doc/README.adoc
              Source: license.adoc
              Source: doc/api/hello.adoc
              Source: doc/api/common.adoc
              Source: license.adoc
            ADOC
          end
        end

        def create_file(path, content)
          project.repository.create_file(project.creator, path, content,
            message: "Add #{path}", branch_name: 'asciidoc')
        end
      end
    end

    def render(*args)
      described_class.render(*args)
    end
  end
end