Aws.Crt.Auth.AwsSigner is unable to sign a request using SigV4A when using Unity for Android and iOS

[ivgnt]

Describe the bug

In my Unity project I am trying to access AWS multi-region access point using the following code:

Config = new AmazonS3Config();

Config.UseArnRegion = false;
Config.RegionEndpoint = RegionEndpoint.EUWest2;
                
Client = new AmazonS3Client(Config);
        
GetObjectRequest req = new GetObjectRequest
{                   
    BucketName = arn:aws:s3::123456789012:accesspoint/<MRAP_alias>,
    Key = filename                    
};

Client.GetObjectAsync(req).Wait();

The same code works in non-Unity projects apps with .NET Core 3.5 and .NET Core 5.0, but when I'm trying to run it in Unity (both .NET Standard 2.1 and .NET Framework), the following error is raised:

MarshalDirectiveException: Marshalling of non-string and non-blittable arrays to managed code is not implemented. (wrapper native-to-managed) Aws.Crt.Auth.AwsSigner.OnHttpRequestSigningComplete(ulong,int,intptr,ulong,intptr,intptr,unit)

There is also no error when I use a bucket name instead of an access point.

Expected Behavior

The requested file is returned

Current Behavior

MarshalDirectiveException is raised

Reproduction Steps

In Unity project:

Config = new AmazonS3Config();

Config.UseArnRegion = false;
Config.RegionEndpoint = RegionEndpoint.EUWest2;
                
Client = new AmazonS3Client(Config);
        
GetObjectRequest req = new GetObjectRequest
{                   
    BucketName = arn:aws:s3::123456789012:accesspoint/<MRAP_alias>,
    Key = filename                    
};

Client.GetObjectAsync(req).Wait();

Possible Solution

No response

Additional Information/Context

Unity 2021.3.8

AWS .NET SDK and/or Package version used

AWSSDK.Core.3.7.13.12
AWSSDK.S3.3.7.9.61
AWSSDK.Extensions.CrtIntegration.3.7.1.4

Targeted .NET Platform

.NET Standard 2.1

Operating System and version

Windows 11

[ashishdhingra]

Needs review with the team since Unity is the special case.

[ivgnt]

Any updates?

[peterrsongg]

@ivgnt Hello, there is an open pull request here: awslabs/aws-crt-dotnet#87 that should address the error you were seeing

[peterrsongg]

@ivgnt The update to target the new version of crt was included in version 3.7.230.0 . If this fixes your problem feel free to close this issue

[ivgnt]

@peterrsongg Thank you! Just tested it, and everything works now. Thank you!

[github-actions]

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[ivgnt]

So, everything worked fine on windows, but we see this error when building and installing the app on both Android and iOS devices

CrtException: Could not detect a supported platform
at Aws.Crt.Platform.GetRuntimePlatformOS () [0x00000] in <00000000000000000000000000000000>:0
at Aws.Crt.CRT+PlatformBinding..ctor () [0x00000] in <00000000000000000000000000000000>:0
at Aws.Crt.CRT..cctor () [0x00000] in <00000000000000000000000000000000>:0
at Aws.Crt.NativeAPI..cctor () [0x00000] in <00000000000000000000000000000000>:0
at Aws.Crt.Auth.AwsSigner+API..cctor () [0x00000] in <00000000000000000000000000000000>:0
at Aws.Crt.Auth.AwsSigner.SignHttpRequest (Aws.Crt.Http.HttpRequest request, Aws.Crt.Auth.AwsSigningConfig signingConfig) [0x00000] in <00000000000000000000000000000000>:0
at Amazon.Extensions.CrtIntegration.CrtAWS4aSigner.SignRequest (Amazon.Runtime.Internal.IRequest request, Amazon.Runtime.IClientConfig clientConfig, Amazon.Runtime.Internal.Util.RequestMetrics metrics, Amazon.Runtime.ImmutableCredentials credentials) [0x00000] in <00000000000000000000000000000000>:0
at Amazon.Runtime.Internal.Auth.S3Signer.Sign

[peterrsongg]

@ivgnt thanks for bringing this to our attention. Since the issue is with the CRT library, can you open up an issue there and reference this issue? This is the repo: https://github.com/awslabs/aws-crt-dotnet

[dscpinheiro]

Closing this as the CRT is not planning to add Android support in .NET.

[github-actions]

Comments on closed issues are hard for our team to see.
If you need more assistance, please either tag a team member or open a new issue that references this one.
If you wish to keep having a conversation with other community members under this issue feel free to do so.