我们正在使用作为 aws-sdk-net 一部分的 Amazon.Lex API 创建机器人，该机器人与 Amazon lex 模型交互。在执行这个机器人时，我们得到下面提到的错误。
SO中还有其他问题存在相同的问题，但这些问题与aws lex sdk无关。
Amazon.Runtime.AmazonUnmarshallingException was unhandled
HResult=-2146233088
Message=Error unmarshalling response back from AWS. Request ID: XXXXXXXXXXXXXX, Response Body: <InvalidSignatureException>
<Message>The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.
The Canonical String for this request should have been
'POST
/bot/OrderFlowers/alias/user/text
content-type:application/x-amz-json-1.1
host:runtime.lex.us-east-1.amazonaws.com
user-agent:aws-sdk-dotnet-45/3.3.1.6 aws-sdk-dotnet-core/3.3.14.1 .NET_Runtime/4.0 .NET_Framework/4.0 OS/Microsoft_Windows_NT_6.2.9200.0 ClientSync
x-amz-content-sha256:
x-amz-date:20170605T120548Z
content-type;host;user-agent;x-amz-content-sha256;x-amz-date'
The String-to-Sign should have been
'AWS4-HMAC-SHA256
20170605T120548Z
20170605/us-east-1/lex/aws4_request'
</Message>
</InvalidSignatureException>
RequestId=
ResponseBody=<InvalidSignatureException>
<Message>The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.
The Canonical String for this request should have been
'POST
/bot/OrderFlowers/alias/user/text
content-type:application/x-amz-json-1.1
host:runtime.lex.us-east-1.amazonaws.com
user-agent:aws-sdk-dotnet-45/3.3.1.6 aws-sdk-dotnet-core/3.3.14.1 .NET_Runtime/4.0 .NET_Framework/4.0 OS/Microsoft_Windows_NT_6.2.9200.0 ClientSync
x-amz-content-sha256:
x-amz-date:20170605T120548Z
content-type;host;user-agent;x-amz-content-sha256;x-amz-date
The String-to-Sign should have been
'AWS4-HMAC-SHA256
20170605T120548Z
20170605/us-east-1/lex/aws4_request
'
</Message>
</InvalidSignatureException>
Source=AWSSDK.Core
StackTrace:
at Amazon.Runtime.Internal.HttpErrorResponseExceptionHandler.HandleException(IExecutionContext executionContext, HttpErrorResponseException exception) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\HttpErrorResponseExceptionHandler.cs:line 111
at Amazon.Runtime.Internal.ExceptionHandler`1.Handle(IExecutionContext executionContext, Exception exception) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ExceptionHandler.cs:line 38
at Amazon.Runtime.Internal.ErrorHandler.ProcessException(IExecutionContext executionContext, Exception exception) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 204
at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\ErrorHandler.cs:line 78
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.Signer.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Signer.cs:line 38
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.CredentialsRetriever.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CredentialsRetriever.cs:line 72
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.RetryHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\RetryHandler\RetryHandler.cs:line 84
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.EndpointResolver.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\EndpointResolver.cs:line 34
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.Marshaller.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\Marshaller.cs:line 37
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\CallbackHandler.cs:line 45
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\ErrorCallbackHandler.cs:line 44
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\PipelineHandler.cs:line 55
at Amazon.Runtime.Internal.MetricsHandler.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\Handlers\MetricsHandler.cs:line 40
at Amazon.Runtime.Internal.RuntimePipeline.InvokeSync(IExecutionContext executionContext) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\RuntimePipeline.cs:line 135
at Amazon.Runtime.AmazonServiceClient.Invoke[TRequest,TResponse](TRequest request, IMarshaller`2 marshaller, ResponseUnmarshaller unmarshaller) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\AmazonServiceClient.cs:line 192
at Amazon.Lex.AmazonLexClient.PostText(PostTextRequest request) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Services\Lex\Generated\_bcl45\AmazonLexClient.cs:line 508
at AWSLexClient.Program.Main(String[] args) in D:\Sameer\Practice\Bots\AWSLexClient\AWSLexClient\Program.cs:line 30
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:
HResult=-2146232000
LineNumber=0
LinePosition=0
Message=Root element is missing.
Source=System.Xml
SourceUri=""
StackTrace:
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at Amazon.Runtime.Internal.Transform.XmlUnmarshallerContext.Read() in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Transform\UnmarshallerContext.cs:line 368
at Amazon.Runtime.Internal.Transform.ErrorResponseUnmarshaller.Unmarshall(XmlUnmarshallerContext context) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Transform\ErrorResponseUnmarshaller.cs:line 36
at Amazon.Runtime.Internal.Transform.JsonErrorResponseUnmarshaller.Unmarshall(JsonUnmarshallerContext context) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Transform\JsonErrorResponseUnmarshaller.cs:line 41
at Amazon.Lex.Model.Internal.MarshallTransformations.PostTextResponseUnmarshaller.UnmarshallException(JsonUnmarshallerContext context, Exception innerException, HttpStatusCode statusCode) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Services\Lex\Generated\Model\Internal\MarshallTransformations\PostTextResponseUnmarshaller.cs:line 110
at Amazon.Runtime.Internal.Transform.JsonResponseUnmarshaller.UnmarshallException(UnmarshallerContext input, Exception innerException, HttpStatusCode statusCode) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Internal\Transform\ResponseUnmarshallers.cs:line 198
at Amazon.Runtime.Internal.HttpErrorResponseExceptionHandler.HandleException(IExecutionContext executionContext, HttpErrorResponseException exception) in E:\JenkinsWorkspaces\v3-trebuchet-release\AWSDotNetPublic\sdk\src\Core\Amazon.Runtime\Pipeline\ErrorHandler\HttpErrorResponseExceptionHandler.cs:line 78
InnerException:
我们实现了以下代码
AWSCredentials credentials = new BasicAWSCredentials("xxxxxxxxxx", "xxxxxxxxxxxxxxxxxx");
AmazonLexClient client = new AmazonLexClient(credentials, new AmazonLexConfig {
ServiceURL = "https://runtime.lex.us-east-1.amazonaws.com",
DisableLogging = false,
#region proxy setting
ProxyCredentials = new NetworkCredential("xxxxxx","XXXXXX")
#endregion
});
var response= client.PostText(new PostTextRequest()
{
BotAlias = "",
BotName = "OrderFlowers",
InputText = "I would like to pick up flowers",
UserId = ""
});
Console.WriteLine("{0}-{1}", response.HttpStatusCode.ToString(), response.Message);
Console.ReadKey();
注意框架的版本：
"AWSSDK.Core" 版本="3.3.14.1" targetFramework="net45"
"AWSSDK.Lex" 版本="3.3.1.6" targetFramework="net45"
在编写此代码之前，我们采取了以下步骤
1) 在 IAM 中创建用户和组
2) 将以下权限关联到分组 AmazonLexRunBotsOnly、AmazonAPIGatewayInvokeFullAccess、AmazonLexReadOnly、AmazonLexFullAccess、AmazonLexRunBotsOnly、AdministratorAccess
3) 将用户添加到该组。
我们需要您的帮助来解决这个问题。另请注意，我们已删除访问密钥和其他机密数据。
谢谢。