Question

我目前正在尝试将AWS CDK与.NET应用程序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（我为这篇文章添加了许多通用名称）。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。除了生成上面突出显示的键值对之外，它几乎可以完美地工作。我尝试过使用数组，生成新的策略声明对象并在.NET中使用键/值对对象。我将在下面分别介绍这三种尝试的示例以及相应的输出。有谁知道以上述相同的方式生成键/值对的方法吗？当然，将CDK与C＃一起使用。

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（如下）：

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（如下）：

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.NETnew策略声明对象中的键/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);

此方法引发错误。我怀疑这与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。

命令行的全部输出（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

Answer 1

我想出了一个解决方案。 C＃中的“字典”对象是完美的，并且JSII运行时也对其进行了编译。

如何在AWS CDK PolicyStatement AddAction方法中嵌套一个KeyValue对？

1 个答案: