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# frozen_string_literal: true
require 'fast_spec_helper'
require 'support/shared_examples/malicious_regexp_shared_examples'
describe Gitlab::UntrustedRegexp do
describe '#initialize' do
subject { described_class.new(pattern) }
context 'invalid regexp' do
let(:pattern) { '[' }
it { expect { subject }.to raise_error(RegexpError) }
end
end
describe '#replace_all' do
it 'replaces all instances of the match in a string' do
result = described_class.new('foo').replace_all('foo bar foo', 'oof')
expect(result).to eq('oof bar oof')
end
end
describe '#replace' do
it 'replaces the first instance of the match in a string' do
result = described_class.new('foo').replace('foo bar foo', 'oof')
expect(result).to eq('oof bar foo')
end
end
describe '#===' do
it 'returns true for a match' do
result = described_class.new('foo') === 'a foo here'
expect(result).to be_truthy
end
it 'returns false for no match' do
result = described_class.new('foo') === 'a bar here'
expect(result).to be_falsy
end
it 'can handle regular expressions in multiline mode' do
regexp = described_class.new('^\d', multiline: true)
result = regexp === "Header\n\n1. Content"
expect(result).to be_truthy
end
end
describe '#match?' do
subject { described_class.new(regexp).match?(text) }
context 'malicious regexp' do
let(:text) { malicious_text }
let(:regexp) { malicious_regexp_re2 }
include_examples 'malicious regexp'
end
context 'matching regexp' do
let(:regexp) { 'foo' }
let(:text) { 'foo' }
it 'returns an array of nil matches' do
is_expected.to eq(true)
end
end
context 'non-matching regexp' do
let(:regexp) { 'boo' }
let(:text) { 'foo' }
it 'returns an array of nil matches' do
is_expected.to eq(false)
end
end
end
describe '#scan' do
subject { described_class.new(regexp).scan(text) }
context 'malicious regexp' do
let(:text) { malicious_text }
let(:regexp) { malicious_regexp_re2 }
include_examples 'malicious regexp'
end
context 'empty regexp' do
let(:regexp) { '' }
let(:text) { 'foo' }
it 'returns an array of nil matches' do
is_expected.to eq([nil, nil, nil, nil])
end
end
context 'empty capture group regexp' do
let(:regexp) { '()' }
let(:text) { 'foo' }
it 'returns an array of nil matches in an array' do
is_expected.to eq([[nil], [nil], [nil], [nil]])
end
end
context 'no capture group' do
let(:regexp) { '.+' }
let(:text) { 'foo' }
it 'returns the whole match' do
is_expected.to eq(['foo'])
end
end
context 'one capture group' do
let(:regexp) { '(f).+' }
let(:text) { 'foo' }
it 'returns the captured part' do
is_expected.to eq([%w[f]])
end
end
context 'two capture groups' do
let(:regexp) { '(f).(o)' }
let(:text) { 'foo' }
it 'returns the captured parts' do
is_expected.to eq([%w[f o]])
end
end
end
end
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