# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Gitlab::HTTPConnectionAdapter, feature_category: :shared do
  include StubRequests

  let(:uri) { URI('https://example.org') }
  let(:options) { {} }

  subject(:connection) { described_class.new(uri, options).connection }

  describe '#connection' do
    before do
      stub_all_dns('https://example.org', ip_address: '93.184.216.34')
    end

    context 'when local requests are allowed' do
      let(:options) { { allow_local_requests: true } }

      it 'sets up the connection' do
        expect(connection).to be_a(Gitlab::NetHttpAdapter)
        expect(connection.address).to eq('93.184.216.34')
        expect(connection.hostname_override).to eq('example.org')
        expect(connection.addr_port).to eq('example.org')
        expect(connection.port).to eq(443)
      end
    end

    context 'when local requests are not allowed' do
      let(:options) { { allow_local_requests: false } }

      it 'sets up the connection' do
        expect(connection).to be_a(Gitlab::NetHttpAdapter)
        expect(connection.address).to eq('93.184.216.34')
        expect(connection.hostname_override).to eq('example.org')
        expect(connection.addr_port).to eq('example.org')
        expect(connection.port).to eq(443)
      end

      context 'when it is a request to local network' do
        let(:uri) { URI('http://172.16.0.0/12') }

        it 'raises error' do
          expect { subject }.to raise_error(
            Gitlab::HTTP::BlockedUrlError,
            "URL is blocked: Requests to the local network are not allowed"
          )
        end

        context 'when local request allowed' do
          let(:options) { { allow_local_requests: true } }

          it 'sets up the connection' do
            expect(connection).to be_a(Gitlab::NetHttpAdapter)
            expect(connection.address).to eq('172.16.0.0')
            expect(connection.hostname_override).to be(nil)
            expect(connection.addr_port).to eq('172.16.0.0')
            expect(connection.port).to eq(80)
          end
        end
      end

      context 'when it is a request to local address' do
        let(:uri) { URI('http://127.0.0.1') }

        it 'raises error' do
          expect { subject }.to raise_error(
            Gitlab::HTTP::BlockedUrlError,
            "URL is blocked: Requests to localhost are not allowed"
          )
        end

        context 'when local request allowed' do
          let(:options) { { allow_local_requests: true } }

          it 'sets up the connection' do
            expect(connection).to be_a(Gitlab::NetHttpAdapter)
            expect(connection.address).to eq('127.0.0.1')
            expect(connection.hostname_override).to be(nil)
            expect(connection.addr_port).to eq('127.0.0.1')
            expect(connection.port).to eq(80)
          end
        end
      end

      context 'when port different from URL scheme is used' do
        let(:uri) { URI('https://example.org:8080') }

        it 'sets up the addr_port accordingly' do
          expect(connection).to be_a(Gitlab::NetHttpAdapter)
          expect(connection.address).to eq('93.184.216.34')
          expect(connection.hostname_override).to eq('example.org')
          expect(connection.addr_port).to eq('example.org:8080')
          expect(connection.port).to eq(8080)
        end
      end
    end

    context 'when DNS rebinding protection is disabled' do
      before do
        stub_application_setting(dns_rebinding_protection_enabled: false)
      end

      it 'sets up the connection' do
        expect(connection).to be_a(Gitlab::NetHttpAdapter)
        expect(connection.address).to eq('example.org')
        expect(connection.hostname_override).to eq(nil)
        expect(connection.addr_port).to eq('example.org')
        expect(connection.port).to eq(443)
      end
    end

    context 'when proxy is enabled' do
      before do
        stub_env('http_proxy', 'http://proxy.example.com')
      end

      it 'proxy stays configured' do
        expect(connection.proxy?).to be true
        expect(connection.proxy_from_env?).to be true
        expect(connection.proxy_address).to eq('proxy.example.com')
      end

      context 'when no_proxy matches the request' do
        before do
          stub_env('no_proxy', 'example.org')
        end

        it 'proxy is disabled' do
          expect(connection.proxy?).to be false
          expect(connection.proxy_from_env?).to be false
          expect(connection.proxy_address).to be nil
        end
      end

      context 'when no_proxy does not match the request' do
        before do
          stub_env('no_proxy', 'example.com')
        end

        it 'proxy stays configured' do
          expect(connection.proxy?).to be true
          expect(connection.proxy_from_env?).to be true
          expect(connection.proxy_address).to eq('proxy.example.com')
        end
      end
    end

    context 'when URL scheme is not HTTP/HTTPS' do
      let(:uri) { URI('ssh://example.org') }

      it 'raises error' do
        expect { subject }.to raise_error(
          Gitlab::HTTP::BlockedUrlError,
          "URL is blocked: Only allowed schemes are http, https"
        )
      end
    end
  end
end