# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Gitlab::HTTPConnectionAdapter 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(Net::HTTP)
        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(Net::HTTP)
        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 'http://172.16.0.0/12' 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(Net::HTTP)
            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 'http://127.0.0.1' 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(Net::HTTP)
            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(Net::HTTP)
          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(Net::HTTP)
        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 http(s) environment variable is set' do
      before do
        stub_env('https_proxy' => 'https://my.proxy')
      end

      it 'sets up the connection' do
        expect(connection).to be_a(Net::HTTP)
        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 settings are configured' do
      let(:options) do
        {
          http_proxyaddr: 'https://proxy.org',
          http_proxyport: 1557,
          http_proxyuser: 'user',
          http_proxypass: 'pass'
        }
      end

      before do
        stub_all_dns('https://proxy.org', ip_address: '166.84.12.54')
      end

      it 'sets up the proxy settings' do
        expect(connection.proxy_address).to eq('https://166.84.12.54')
        expect(connection.proxy_port).to eq(1557)
        expect(connection.proxy_user).to eq('user')
        expect(connection.proxy_pass).to eq('pass')
      end

      context 'when the address has path' do
        before do
          options[:http_proxyaddr] = 'https://proxy.org/path'
        end

        it 'sets up the proxy settings' do
          expect(connection.proxy_address).to eq('https://166.84.12.54/path')
          expect(connection.proxy_port).to eq(1557)
        end
      end

      context 'when the port is in the address and port' do
        before do
          options[:http_proxyaddr] = 'https://proxy.org:1422'
        end

        it 'sets up the proxy settings' do
          expect(connection.proxy_address).to eq('https://166.84.12.54')
          expect(connection.proxy_port).to eq(1557)
        end

        context 'when the port is only in the address' do
          before do
            options[:http_proxyport] = nil
          end

          it 'sets up the proxy settings' do
            expect(connection.proxy_address).to eq('https://166.84.12.54')
            expect(connection.proxy_port).to eq(1422)
          end
        end
      end

      context 'when it is a request to local network' do
        before do
          options[:http_proxyaddr] = 'http://172.16.0.0/12'
        end

        it 'raises error' do
          expect { subject }.to raise_error(
            Gitlab::HTTP::BlockedUrlError,
            "URL 'http://172.16.0.0:1557/12' is blocked: Requests to the local network are not allowed"
          )
        end

        context 'when local request allowed' do
          before do
            options[:allow_local_requests] = true
          end

          it 'sets up the connection' do
            expect(connection.proxy_address).to eq('http://172.16.0.0/12')
            expect(connection.proxy_port).to eq(1557)
          end
        end
      end

      context 'when it is a request to local address' do
        before do
          options[:http_proxyaddr] = 'http://127.0.0.1'
        end

        it 'raises error' do
          expect { subject }.to raise_error(
            Gitlab::HTTP::BlockedUrlError,
            "URL 'http://127.0.0.1:1557' is blocked: Requests to localhost are not allowed"
          )
        end

        context 'when local request allowed' do
          before do
            options[:allow_local_requests] = true
          end

          it 'sets up the connection' do
            expect(connection.proxy_address).to eq('http://127.0.0.1')
            expect(connection.proxy_port).to eq(1557)
          end
        end
      end

      context 'when http(s) environment variable is set' do
        before do
          stub_env('https_proxy' => 'https://my.proxy')
        end

        it 'sets up the connection' do
          expect(connection.proxy_address).to eq('https://proxy.org')
          expect(connection.proxy_port).to eq(1557)
        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.proxy_address).to eq('https://proxy.org')
          expect(connection.proxy_port).to eq(1557)
        end
      end
    end
  end
end