3

我目前正在尝试使用带有 .NET 应用程序的 AWS CDK 复制另一个开发人员的 powershell 脚本功能。他正在使用 VaporShell 生成 CloudFormation 模板 (YAML)。我将 CloudFormation 模板放在下面（我为这篇文章设置了许多通用名称）。我放了一个箭头，指向让我头疼的键值对。

Resources:
  rSNSTopic:
    Type: AWS::SNS::Topic
    Properties:
      DisplayName: 'SNS topic'
      TopicName: 'SNS Topic'
  rSNSPolicy:
    Type: AWS::SNS::TopicPolicy
    Properties:
      Topics:
        - !Ref 'rSNSTopic'
      PolicyDocument:
        Statement:
          - Condition:
              StringEquals:
                AWS:SourceOwner: 'CurrentAcct' <=== This is the key/value pair.
            Action:
              - SNS:Publish
              - SNS:RemovePermission
              - SNS:SetTopicAttributes
              - SNS:DeleteTopic
              - SNS:ListSubscriptionsByTopic
              - SNS:GetTopicAttributes
              - SNS:Receive
              - SNS:AddPermission
              - SNS:Subscribe
            Resource: !Ref 'rSNSTopic'
            Effect: Allow
            Sid: Default
            Principal:
              AWS: '*'
      Version: '2012-10-17'

我已经能够使用 C# 应用程序和 AWS CDK 生成另一个 CloudFormation 模板。除了生成我上面强调的键值对之外，它几乎可以完美地工作。我尝试过使用数组、生成新的策略语句对象并在 .NET 中使用键/值对对象。我将在下面列出这三种尝试中的每一种的示例以及相应的输出。有谁知道以上面显示的相同方式生成键/值对的方法？当然是在 C# 中使用 CDK。

尝试 1：使用字符串数组。

C# 代码（如下）：

var topic = new Topic(this, "rSNSTopic", new TopicProps
        {               
            DisplayName = "SNS topic",
            TopicName = "SNS topic"
        });

        var topicPolicyStatement1 = new PolicyStatement(0)
            .Describe("Default")
            .AddAwsPrincipal("*")
            .AddActions("- SNS:Publish\n" +
                        "- SNS:RemovePermission\n" +
                        "- SNS:SetTopicAttributes\n" +
                        "- SNS:DeleteTopic\n" +
                        "- SNS:ListSubscriptionsByTopic\n" +
                        "- SNS:GetTopicAttributes\n" +
                        "- SNS:Receive\n" +
                        "- SNS:AddPermission\n" +
                        "- SNS:Subscribe\n")
            .AddCondition("StringEquals",
               new [] {"AWS:SourceOwner", "pTestAccnt"}) <=== Using an array as the second .AddCondition parameter.
            .AddCondition("aws:SourceArn", topic.TopicArn)
            .AddResource(topic.TopicArn);

        topic.AddToResourcePolicy(topicPolicyStatement1);
        topic.AddToResourcePolicy(topicPolicyStatement2);

CloudFormation 模板的生成键/值对部分（下）：

Condition:
   StringEquals:
      - AWS:SourceOwner
      - TestAccnt

尝试 2：使用新的策略声明对象。

C# 代码（如下）：

var topic = new Topic(this, "rSNSTopic", new TopicProps
        {               
            DisplayName = "SNS topic",
            TopicName = "SNS topic"
        });

        var topicPolicyStatement1 = new PolicyStatement(0)
            .Describe("Default")
            .AddAwsPrincipal("*")
            .AddActions("- SNS:Publish\n" +
                        "- SNS:RemovePermission\n" +
                        "- SNS:SetTopicAttributes\n" +
                        "- SNS:DeleteTopic\n" +
                        "- SNS:ListSubscriptionsByTopic\n" +
                        "- SNS:GetTopicAttributes\n" +
                        "- SNS:Receive\n" +
                        "- SNS:AddPermission\n" +
                        "- SNS:Subscribe\n")
            .AddCondition("StringEquals",
               new PolicyStatement(0).AddCondition("AWS:SourceOwner", "pTestAccnt")) <=== Using a policy statement as the second .AddCondition parameter.
            .AddCondition("aws:SourceArn", topic.TopicArn)
            .AddResource(topic.TopicArn);

        topic.AddToResourcePolicy(topicPolicyStatement1);
        topic.AddToResourcePolicy(topicPolicyStatement2);

CloudFormation 模板的生成键/值对部分（下）：

Condition:
   StringEquals:
      Condition: <=== This solution creates a second condition key which throws an error in AWS CloudFormation.
         AWS:SourceOwner: TestAccnt <=== This key value pair looks correct.

尝试 3：使用来自 .NETnew 策略语句对象的键/值对象。

C# 代码（如下）：

var topic = new Topic(this, "rSNSTopic", new TopicProps
        {               
            DisplayName = "SNS topic",
            TopicName = "SNS topic"
        });

        var topicPolicyStatement1 = new PolicyStatement(0)
            .Describe("Default")
            .AddAwsPrincipal("*")
            .AddActions("- SNS:Publish\n" +
                        "- SNS:RemovePermission\n" +
                        "- SNS:SetTopicAttributes\n" +
                        "- SNS:DeleteTopic\n" +
                        "- SNS:ListSubscriptionsByTopic\n" +
                        "- SNS:GetTopicAttributes\n" +
                        "- SNS:Receive\n" +
                        "- SNS:AddPermission\n" +
                        "- SNS:Subscribe\n")
            .AddCondition("StringEquals",
               new KeyValuePair<string, string>("AWS:SourceOwner", "pTestAccnt")) <=== Using a policy statement as the second .AddCondition parameter.
            .AddCondition("aws:SourceArn", topic.TopicArn)
            .AddResource(topic.TopicArn);

        topic.AddToResourcePolicy(topicPolicyStatement1);
        topic.AddToResourcePolicy(topicPolicyStatement2);

这种方法会引发错误。我怀疑它与 JSII 运行时编译/解释我在 C# 应用程序中使用的键/值对对象有关。

命令行的整个输出（如下）：

Unhandled Exception: System.ArgumentException: Could not infer JSII type for .NET type 'KeyValuePair`2'
Parameter name: type
   at Amazon.JSII.Runtime.Services.Converters.FrameworkToJsiiConverter.InferType(IReferenceMap referenceMap, Type type)
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.ConvertAny(IReferenceMap referenceMap, Object value)
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.TryConvertPrimitive(IReferenceMap referenceMap, Object value, Boolean isOptional, PrimitiveType primitiveType, Object& result)
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.TryConvert(TypeReference typeReference, IReferenceMap referenceMap, Object value, Object& result)
   at Amazon.JSII.Runtime.Deputy.DeputyBase.<>c__DisplayClass20_0.<ConvertArguments>b__0(Parameter parameter, Object frameworkArgument)
   at System.Linq.Enumerable.ZipIterator[TFirst,TSecond,TResult](IEnumerable`1 first, IEnumerable`1 second, Func`3 resultSelector)+MoveNext()
   at System.Collections.Generic.LargeArrayBuilder`1.AddRange(IEnumerable`1 items)
   at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Amazon.JSII.Runtime.Deputy.DeputyBase.<InvokeMethodCore>g__GetResult|18_0[T](<>c__DisplayClass18_0`1& )
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeMethodCore[T](JsiiMethodAttribute methodAttribute, Object[] arguments, Func`3 beginFunc, Func`3 invokeFunc)
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeInstanceMethod[T](Object[] arguments, String methodName)
   at HelloCdk.TestStack..ctor(App parent, String name, IStackProps props) in C:\Users\SomeUser\Documents\git\SomeGITRepo\SingleStackGenerator\src\HelloCdk\TestStack.cs:line 57
   at HelloCdk.Program.Main(String[] args) in C:\Users\SomeUser\Documents\git\SomeGITRepo\SingleStackGenerator\src\HelloCdk\Program.cs:line 18
(node:39548) UnhandledPromiseRejectionWarning: Error: EPIPE: broken pipe, write
    at Object.writeSync (fs.js:569:3)
    at t.SyncStdio.writeBuffer (C:\Users\SomeUser\AppData\Local\Temp\gnh3dhha.5kf\jsii-runtime.js:1:165352)
    at t.SyncStdio.writeLine (C:\Users\SomeUser\AppData\Local\Temp\gnh3dhha.5kf\jsii-runtime.js:1:164892)
    at t.InputOutput.write (C:\Users\SomeUser\AppData\Local\Temp\gnh3dhha.5kf\jsii-runtime.js:1:164341)
    at t.KernelHost.writeError (C:\Users\SomeUser\AppData\Local\Temp\gnh3dhha.5kf\jsii-runtime.js:1:79440)
    at i.then.catch.e (C:\Users\SomeUser\AppData\Local\Temp\gnh3dhha.5kf\jsii-runtime.js:1:79101)
(node:39548) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:39548) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
Subprocess exited with error 3762504530
4

2 回答 2

1

我想出了一个解决办法。C# 中的“字典”对象是完美的，JSII 运行时也会编译它。

于 2019-03-29T12:16:24.690 回答
1

面临同样的问题，解决方案不是很明显......发布最终代码片段：

var topic = new Topic(this, "rSNSTopic", new TopicProps
{
    DisplayName = "SNS topic",
    TopicName = "SNS topic"
});

topic.AddToResourcePolicy(new PolicyStatement(
    new PolicyStatementProps
    {
        Principals = new IPrincipal[] { new AnyPrincipal() },
        Actions = new []
        {
            "SNS:Publish",
            "SNS:RemovePermission",
            "SNS:SetTopicAttributes",
            "SNS:DeleteTopic",
            "SNS:ListSubscriptionsByTopic",
            "SNS:GetTopicAttributes",
            "SNS:Receive",
            "SNS:AddPermission",
            "SNS:Subscribe"
        },
        Resources = new[] { topic.TopicArn },
        Conditions = new Dictionary<string, object>
        {
            {"StringEquals", 
                new Dictionary<string, object> {{ "aws:SourceOwner", "pTestAccnt" } }},
            {"StringEquals", 
                new Dictionary<string, object> {{ "aws:SourceArn", topic.TopicArn } }
        }
    }
);
于 2021-08-29T20:31:23.200 回答