proxy_validator.dart 2.75 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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import 'base/io.dart';
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import 'base/platform.dart';
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import 'doctor_validator.dart';
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/// A validator that displays configured HTTP_PROXY environment variables.
///
/// if the `HTTP_PROXY` environment variable is non-empty, the contents are
/// validated along with `NO_PROXY`.
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class ProxyValidator extends DoctorValidator {
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  ProxyValidator({
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    required Platform platform,
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  })  : shouldShow = _getEnv('HTTP_PROXY', platform).isNotEmpty,
        _httpProxy = _getEnv('HTTP_PROXY', platform),
        _noProxy = _getEnv('NO_PROXY', platform),
        super('Proxy Configuration');
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  final bool shouldShow;
  final String _httpProxy;
  final String _noProxy;
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  /// Gets a trimmed, non-null environment variable. If the variable is not set
  /// an empty string will be returned. Checks for the lowercase version of the
  /// environment variable first, then uppercase to match Dart's HTTP implementation.
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  static String _getEnv(String key, Platform platform) =>
    platform.environment[key.toLowerCase()]?.trim() ??
    platform.environment[key.toUpperCase()]?.trim() ??
    '';
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  @override
  Future<ValidationResult> validate() async {
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    if (_httpProxy.isEmpty) {
      return const ValidationResult(
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          ValidationType.success, <ValidationMessage>[]);
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    }

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    final List<ValidationMessage> messages = <ValidationMessage>[
      const ValidationMessage('HTTP_PROXY is set'),
      if (_noProxy.isEmpty)
        const ValidationMessage.hint('NO_PROXY is not set')
      else
        ...<ValidationMessage>[
          ValidationMessage('NO_PROXY is $_noProxy'),
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          for (final String host in await _getLoopbackAddresses())
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            if (_noProxy.contains(host))
              ValidationMessage('NO_PROXY contains $host')
            else
              ValidationMessage.hint('NO_PROXY does not contain $host'),
        ],
    ];

    final bool hasIssues = messages.any(
      (ValidationMessage msg) => msg.isHint || msg.isError);
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    return ValidationResult(
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      hasIssues ? ValidationType.partial : ValidationType.success,
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      messages,
    );
  }
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  Future<List<String>> _getLoopbackAddresses() async {
    final List<String> loopBackAddresses = <String>['localhost'];

    final List<NetworkInterface> networkInterfaces =
      await listNetworkInterfaces(includeLinkLocal: true, includeLoopback: true);

    for (final NetworkInterface networkInterface in networkInterfaces) {
      for (final InternetAddress internetAddress in networkInterface.addresses) {
        if (internetAddress.isLoopback) {
          loopBackAddresses.add(internetAddress.address);
        }
      }
    }

    return loopBackAddresses;
  }
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}