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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Banzai::Filter::SyntaxHighlightFilter, feature_category: :team_planning do
include FilterSpecHelper
shared_examples "XSS prevention" do |lang|
it "escapes HTML tags" do
# This is how a script tag inside a code block is presented to this filter
# after Markdown rendering.
result = filter(%{<pre data-canonical-lang="#{lang}"><code><script>alert(1)</script></code></pre>})
# `(1)` symbols are wrapped by lexer tags.
expect(result.to_html).not_to match(%r{<script>alert.*</script>})
# `<>` stands for lexer tags like <span ...>, not <s above.
expect(result.to_html).to match(%r{alert(<.*>)?\((<.*>)?1(<.*>)?\)})
end
end
context "when no language is specified" do
it "highlights as plaintext" do
result = filter('<pre><code>def fun end</code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">def fun end</span></code></pre><copy-code></copy-code></div>')
end
include_examples "XSS prevention", ""
end
context "when contains mermaid diagrams" do
it "ignores mermaid blocks" do
result = filter('<pre data-mermaid-style="display" data-canonical-lang="mermaid"><code class="js-render-mermaid">mermaid code</code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre data-mermaid-style="display" data-canonical-lang="mermaid" class="code highlight js-syntax-highlight language-mermaid" lang="mermaid" v-pre="true"><code class="js-render-mermaid"><span id="LC1" class="line" lang="mermaid">mermaid code</span></code></pre><copy-code></copy-code></div>')
end
end
context "when <pre> contains multiple <code> tags" do
it "ignores the block" do
result = filter('<pre><code>one</code> and <code>two</code></pre>')
expect(result.to_html).to eq('<pre><code>one</code> and <code>two</code></pre>')
end
end
# This can happen with the following markdown
#
# <div>
# <pre><code>
# something
#
# else
# </code></pre>
# </div>
#
# The blank line causes markdown to process ` else` as a code block.
# Which could lead to an orphaned node being replaced and failing
context "when <pre><code> is a child of <pre><code> which is a child of a div " do
it "captures all text and doesn't fail trying to replace a node with no parent" do
text = "<div>\n<pre><code>\nsomething\n<pre><code>else\n</code></pre></code></pre>\n</div>"
result = filter(text)
expect(result.to_html.delete("\n")).to eq('<div><div class="gl-relative markdown-code-block js-markdown-code"><pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"></span><span id="LC2" class="line" lang="plaintext">something</span><span id="LC3" class="line" lang="plaintext">else</span></code></pre><copy-code></copy-code></div></div>')
end
end
context "when a valid language is specified" do
it "highlights as that language" do
result = filter('<pre data-canonical-lang="ruby"><code>def fun end</code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre data-canonical-lang="ruby" class="code highlight js-syntax-highlight language-ruby" lang="ruby" v-pre="true"><code><span id="LC1" class="line" lang="ruby"><span class="k">def</span> <span class="nf">fun</span> <span class="k">end</span></span></code></pre><copy-code></copy-code></div>')
end
include_examples "XSS prevention", "ruby"
end
context "when an invalid language is specified" do
it "highlights as plaintext" do
result = filter('<pre data-canonical-lang="gnuplot"><code>This is a test</code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre data-canonical-lang="gnuplot" class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">This is a test</span></code></pre><copy-code></copy-code></div>')
end
include_examples "XSS prevention", "gnuplot"
end
context "languages that should be passed through" do
%w(math mermaid plantuml suggestion).each do |lang|
context "when #{lang} is specified" do
it "highlights as plaintext but with the correct language attribute and class" do
result = filter(%{<pre data-canonical-lang="#{lang}"><code>This is a test</code></pre>})
copy_code_btn = '<copy-code></copy-code>' unless lang == 'suggestion'
expect(result.to_html.delete("\n")).to eq(%{<div class="gl-relative markdown-code-block js-markdown-code"><pre data-canonical-lang="#{lang}" class="code highlight js-syntax-highlight language-#{lang}" lang="#{lang}" v-pre="true"><code><span id="LC1" class="line" lang="#{lang}">This is a test</span></code></pre>#{copy_code_btn}</div>})
end
include_examples "XSS prevention", lang
end
end
end
context "when sourcepos metadata is available" do
it "includes it in the highlighted code block" do
result = filter('<pre data-sourcepos="1:1-3:3" data-canonical-lang="plaintext"><code>This is a test</code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre data-sourcepos="1:1-3:3" data-canonical-lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">This is a test</span></code></pre><copy-code></copy-code></div>')
end
it "escape sourcepos metadata to prevent XSS" do
result = filter('<pre data-sourcepos=""%22 href="x"></pre><base href=http://unsafe-website.com/><pre x=""><code></code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre data-sourcepos=\'"%22 href="x"></pre><base href=http://unsafe-website.com/><pre x="\' class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code></code></pre><copy-code></copy-code></div>')
end
end
context "when Rouge lexing fails" do
before do
allow_next_instance_of(Rouge::Lexers::Ruby) do |instance|
allow(instance).to receive(:stream_tokens).and_raise(StandardError)
end
end
it "highlights as plaintext" do
result = filter('<pre data-canonical-lang="ruby"><code>This is a test</code></pre>')
expect(result.to_html.delete("\n")).to eq('<div class="gl-relative markdown-code-block js-markdown-code"><pre data-canonical-lang="ruby" class="code highlight js-syntax-highlight" lang="" v-pre="true"><code><span id="LC1" class="line" lang="">This is a test</span></code></pre><copy-code></copy-code></div>')
end
include_examples "XSS prevention", "ruby"
end
context "when Rouge lexing fails after a retry" do
before do
allow_next_instance_of(Rouge::Lexers::PlainText) do |instance|
allow(instance).to receive(:stream_tokens).and_raise(StandardError)
end
end
it "does not add highlighting classes" do
result = filter('<pre><code>This is a test</code></pre>')
expect(result.to_html).to eq('<pre><code>This is a test</code></pre>')
end
include_examples "XSS prevention", "ruby"
end
it_behaves_like "html filter timeout" do
let(:text) { '<pre data-canonical-lang="ruby"><code>def fun end</code></pre>' }
end
end
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