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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Banzai::Filter::SanitizationFilter do
include FilterSpecHelper
it_behaves_like 'default allowlist'
describe 'custom allowlist' do
it_behaves_like 'XSS prevention'
it_behaves_like 'sanitize link'
it 'customizes the allowlist only once' do
instance = described_class.new('Foo')
control_count = instance.allowlist[:transformers].size
3.times { instance.allowlist }
expect(instance.allowlist[:transformers].size).to eq control_count
end
it 'customizes the allowlist only once for different instances' do
instance1 = described_class.new('Foo1')
instance2 = described_class.new('Foo2')
control_count = instance1.allowlist[:transformers].size
instance1.allowlist
instance2.allowlist
expect(instance1.allowlist[:transformers].size).to eq control_count
expect(instance2.allowlist[:transformers].size).to eq control_count
end
it 'sanitizes `class` attribute from all elements' do
act = %q(<pre class="code highlight white c"><code><span class="k">def</span></code></pre>)
exp = %q(<pre><code><span class="k">def</span></code></pre>)
expect(filter(act).to_html).to eq exp
end
it 'sanitizes `class` attribute from non-highlight spans' do
act = %q(<span class="k">def</span>)
expect(filter(act).to_html).to eq %q(<span>def</span>)
end
it 'allows `text-align` property in `style` attribute on table elements' do
html = <<~HTML
<table>
<tr><th style="text-align: center">Head</th></tr>
<tr><td style="text-align: right">Body</th></tr>
</table>
HTML
doc = filter(html)
expect(doc.at_css('th')['style']).to eq 'text-align: center'
expect(doc.at_css('td')['style']).to eq 'text-align: right'
end
it 'disallows other properties in `style` attribute on table elements' do
html = <<~HTML
<table>
<tr><th style="text-align: foo">Head</th></tr>
<tr><td style="position: fixed; height: 50px; width: 50px; background: red; z-index: 999; font-size: 36px; text-align: center">Body</th></tr>
</table>
HTML
doc = filter(html)
expect(doc.at_css('th')['style']).to be_nil
expect(doc.at_css('td')['style']).to eq 'text-align: center'
end
it 'disallows `text-align` property in `style` attribute on other elements' do
html = <<~HTML
<div style="text-align: center">Text</div>
HTML
doc = filter(html)
expect(doc.at_css('div')['style']).to be_nil
end
it 'allows `span` elements' do
exp = act = %q(<span>Hello</span>)
expect(filter(act).to_html).to eq exp
end
it 'allows `abbr` elements' do
exp = act = %q(<abbr title="HyperText Markup Language">HTML</abbr>)
expect(filter(act).to_html).to eq exp
end
it 'disallows the `name` attribute globally, allows on `a`' do
html = <<~HTML
<img name="getElementById" src="">
<span name="foo" class="bar">Hi</span>
<a name="foo" class="bar">Bye</a>
HTML
doc = filter(html)
expect(doc.at_css('img')).not_to have_attribute('name')
expect(doc.at_css('span')).not_to have_attribute('name')
expect(doc.at_css('a')).to have_attribute('name')
end
it 'allows `summary` elements' do
exp = act = '<summary>summary line</summary>'
expect(filter(act).to_html).to eq exp
end
it 'allows `details` elements' do
exp = act = '<details>long text goes here</details>'
expect(filter(act).to_html).to eq exp
end
it 'allows `rel=license` in links' do
exp = act = '<a rel="license" href="http://example.com">rel-license</a>'
expect(filter(act).to_html).to eq exp
end
it 'allows `data-math-style` attribute on `code` and `pre` elements' do
html = <<-HTML
<pre class="code" data-math-style="inline">something</pre>
<code class="code" data-math-style="inline">something</code>
<div class="code" data-math-style="inline">something</div>
HTML
output = <<-HTML
<pre data-math-style="inline">something</pre>
<code data-math-style="inline">something</code>
<div>something</div>
HTML
expect(filter(html).to_html).to eq(output)
end
it 'allows the `data-sourcepos` attribute globally' do
exp = %q(<p data-sourcepos="1:1-1:10">foo/bar.md</p>)
act = filter(exp)
expect(act.to_html).to eq exp
end
describe 'footnotes' do
it 'allows correct footnote id property on links' do
exp = %q(<a href="#fn-first" id="fnref-first">foo/bar.md</a>)
act = filter(exp)
expect(act.to_html).to eq exp
end
it 'allows correct footnote id property on li element' do
exp = %q(<ol><li id="fn-last">footnote</li></ol>)
act = filter(exp)
expect(act.to_html).to eq exp
end
it 'removes invalid id for footnote links' do
exp = %q(<a href="#fn1">link</a>)
%w[fnrefx test xfnref-1].each do |id|
act = filter(%(<a href="#fn1" id="#{id}">link</a>))
expect(act.to_html).to eq exp
end
end
it 'removes invalid id for footnote li' do
exp = %q(<ol><li>footnote</li></ol>)
%w[fnx test xfn-1].each do |id|
act = filter(%(<ol><li id="#{id}">footnote</li></ol>))
expect(act.to_html).to eq exp
end
end
end
end
end
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