renamed image resizing patterns to be more clear

s3-lambda-resizing-dotnet/ImageResize.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33815.320
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ImageResize", "ImageResize\ImageResize.csproj", "{FADD6CE5-EDF7-4BFE-B8F5-E84CD788D6DE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FADD6CE5-EDF7-4BFE-B8F5-E84CD788D6DE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FADD6CE5-EDF7-4BFE-B8F5-E84CD788D6DE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FADD6CE5-EDF7-4BFE-B8F5-E84CD788D6DE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FADD6CE5-EDF7-4BFE-B8F5-E84CD788D6DE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {3B666636-4024-4B31-80A6-CB25C208D7F9}
+	EndGlobalSection
+EndGlobal

s3-lambda-resizing-dotnet/ImageResize/Function.cs

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+using System.IO;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.PixelFormats;
+using Amazon.S3.Model;
+using SixLabors.ImageSharp.Formats.Jpeg;
+using Amazon.Lambda.Core;
+using Amazon.Lambda.S3Events;
+using Amazon.S3;
+using Amazon.S3.Util;
+
+// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
+[assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))]
+
+namespace ImageResize;
+
+public class Function
+{
+    IAmazonS3 S3Client { get; set; }
+
+
+    /// <summary>
+    /// Default constructor. This constructor is used by Lambda to construct the instance. When invoked in a Lambda environment
+    /// the AWS credentials will come from the IAM role associated with the function and the AWS region will be set to the
+    /// region the Lambda function is executed in.
+    /// </summary>
+    public Function()
+    {
+        S3Client = new AmazonS3Client();
+    }
+
+    /// <summary>
+    /// Constructs an instance with a preconfigured S3 client. This can be used for testing outside of the Lambda environment.
+    /// </summary>
+    /// <param name="s3Client"></param>
+    public Function(IAmazonS3 s3Client)
+    {
+        this.S3Client = s3Client;
+    }
+
+    public async Task<string> FunctionHandler(S3Event evnt, ILambdaContext context)
+    {
+        string[] fileExtensions = new string[] { ".jpg", ".jpeg" };
+        var s3Event = evnt.Records?[0].S3;
+        if (s3Event == null)
+        {
+            return null;
+        }
+
+        try
+        {
+            foreach (var record in evnt.Records)
+            {
+                LambdaLogger.Log("----> File: " + record.S3.Object.Key);
+                if (!fileExtensions.Contains(Path.GetExtension(record.S3.Object.Key).ToLower()))
+                {
+                    LambdaLogger.Log("File Extension is not supported - " + s3Event.Object.Key);
+                    continue;
+                }
+
+                string suffix = Path.GetExtension(record.S3.Object.Key).ToLower();
+                Stream imageStream = new MemoryStream();
+                using (var objectResponse = await S3Client.GetObjectAsync(record.S3.Bucket.Name, record.S3.Object.Key))
+                {
+                    using (Stream responseStream = objectResponse.ResponseStream)
+                    {
+                        using (var image = Image.Load(responseStream))
+                        {
+                            // Create B&W thumbnail
+                            image.Mutate(ctx => ctx.Grayscale().Resize(200, 200));
+                            image.Save(imageStream, new JpegEncoder());
+                            imageStream.Seek(0, SeekOrigin.Begin);
+                        }
+                    }
+                }
+
+                // Creating a new S3 ObjectKey for the thumbnails
+                string thumbnailObjectKey = null;
+                int endSlash = record.S3.Object.Key.ToLower().LastIndexOf("/");
+                if (endSlash > 0)
+                {
+                    string S3ObjectName = record.S3.Object.Key.ToLower().Substring(endSlash + 1);
+                    int beginSlash = 0;
+                    if (endSlash > 0)
+                    {
+                        beginSlash = record.S3.Object.Key.ToLower().Substring(0, endSlash - 1).LastIndexOf("/");
+                        if (beginSlash > 0)
+                        {
+                            thumbnailObjectKey =
+                                record.S3.Object.Key.ToLower().Substring(0, beginSlash) +
+                                "thumbnails/" +
+                                S3ObjectName;
+                        }
+                        else
+                        {
+                            thumbnailObjectKey = "thumbnails/" + S3ObjectName;
+                        }
+                    }
+                }
+                else
+                {
+                    thumbnailObjectKey = "thumbnails/" + record.S3.Object.Key.ToLower();
+                }
+
+                LambdaLogger.Log("----> Thumbnail file Key: " + thumbnailObjectKey);
+                var destinationBucket = Environment.GetEnvironmentVariable("DESTINATION_BUCKET_NAME");
+                await S3Client.PutObjectAsync(new PutObjectRequest
+                {
+                    BucketName = destinationBucket,
+                    Key = thumbnailObjectKey,
+                    InputStream = imageStream
+                });
+            }
+
+            LambdaLogger.Log("Processed " + evnt.Records.Count.ToString());
+
+            return null;
+        }
+        catch (Exception e)
+        {
+            context.Logger.LogLine($"Error getting object {s3Event.Object.Key} from bucket {s3Event.Bucket.Name}");
+            context.Logger.LogLine($"Make sure they exist and your bucket is in the same region as this function");
+            context.Logger.LogLine(e.Message);
+            context.Logger.LogLine(e.StackTrace);
+            throw;
+        }
+    }
+}

s3-lambda-resizing-dotnet/ImageResize/ImageResize.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
+    <AWSProjectType>Lambda</AWSProjectType>
+    <!-- This property makes the build directory similar to a publish directory and helps the AWS .NET Lambda Mock Test Tool find project dependencies. -->
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
+    <!-- Generate ready to run images during publishing to improve cold start time. -->
+    <PublishReadyToRun>true</PublishReadyToRun>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Amazon.Lambda.Core" Version="2.1.0" />
+    <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.3.1" />
+    <PackageReference Include="Amazon.Lambda.S3Events" Version="3.0.0" />
+    <PackageReference Include="AWSSDK.S3" Version="3.7.104.2" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.5" />
+  </ItemGroup>
+</Project>

s3-lambda-resizing-dotnet/ImageResize/Properties/launchSettings.json

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+{
+  "profiles": {
+    "Mock Lambda Test Tool": {
+      "commandName": "Executable",
+      "commandLineArgs": "--port 5050",
+      "workingDirectory": ".\\bin\\$(Configuration)\\net6.0",
+      "executablePath": "%USERPROFILE%\\.dotnet\\tools\\dotnet-lambda-test-tool-6.0.exe"
+    }
+  }
+}

s3-lambda-resizing-dotnet/ImageResize/aws-lambda-tools-defaults.json

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+
+{
+    "Information" : [
+        "This file provides default values for the deployment wizard inside Visual Studio and the AWS Lambda commands added to the .NET Core CLI.",
+        "To learn more about the Lambda commands with the .NET Core CLI execute the following command at the command line in the project root directory.",
+        "dotnet lambda help",
+        "All the command line options for the Lambda command can be specified in this file."
+    ],
+    "profile"     : "default",
+    "region"      : "us-east-1",
+    "configuration" : "Release",
+    "function-runtime" : "dotnet6",
+    "function-memory-size" : 256,
+    "function-timeout"     : 30,
+    "function-handler"     : "ImageResize::ImageResize.Function::FunctionHandler",
+    "framework"            : "net6.0",
+    "function-name"        : "ImageResize",
+    "package-type"         : "Zip",
+    "function-role"        : "arn:aws:iam::595982400875:role/ImageResizeLambdaRole",
+    "function-architecture" : "x86_64",
+    "function-subnets"      : "",
+    "function-security-groups" : "",
+    "tracing-mode"             : "PassThrough",
+    "environment-variables"    : "",
+    "image-tag"                : ""
+}

s3-lambda-resizing-dotnet/README.md

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+# AWS Amazon S3 to AWS Lambda - Create a Lambda function that resizes images uploaded to S3
+
+The SAM template deploys a .NET 6 Lambda function, an S3 bucket and the IAM resources required to run the application. A Lambda function consumes <code>ObjectCreated</code> events from an Amazon S3 bucket. The function code checks the uploaded file is an image and creates a thumbnail version of the image in the same bucket.
+
+Learn more about this pattern at Serverless Land Patterns: [https://serverlessland.com/patterns/s3-lambda-dotnet](https://serverlessland.com/patterns/s3-lambda-dotnet)
+
+Important: this application uses various AWS services and there are costs associated with these services after the Free Tier usage - please see the [AWS Pricing page](https://aws.amazon.com/pricing/) for details. You are responsible for any AWS costs incurred. No warranty is implied in this example.
+
+## Requirements
+
+* [Create an AWS account](https://portal.aws.amazon.com/gp/aws/developer/registration/index.html) if you do not already have one and log in. The IAM user that you use must have sufficient permissions to make necessary AWS service calls and manage AWS resources.
+* [AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html) installed and configured
+* [Git Installed](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
+* [AWS Serverless Application Model](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html) (AWS SAM) installed
+* [.Net 6.0](https://dotnet.microsoft.com/en-us/download/dotnet/6.0)
+* [Docker](https://docs.docker.com/get-docker/) installed and running
+
+## Deployment Instructions
+
+1. Create a new directory, navigate to that directory in a terminal and clone the GitHub repository:
+    ``` 
+    git clone https://github.com/aws-samples/serverless-patterns
+    ```
+1. Change directory to the pattern directory:
+    ```
+    cd s3-lambda-dotnet
+    ```
+1. From the command line, use AWS SAM to build and deploy the AWS resources for the pattern as specified in the template.yml file:
+    ```
+    sam build
+    sam deploy --guided
+    ```
+1. During the prompts:
+    * Enter a stack name
+    * Enter the desired AWS Region
+    * Allow SAM CLI to create IAM roles with the required permissions.
+
+    Once you have run `sam deploy -guided` mode once and saved arguments to a configuration file (samconfig.toml), you can use `sam deploy` in future to use these defaults.
+
+1. Note the outputs from the SAM deployment process. These contain the resource names and/or ARNs which are used for testing.
+
+## How it works
+
+* Use the AWS CLI upload an image to S3
+* If the object is a .jpeg in the source bucket, the code creates a thumbnail and saves it to the destination bucket in a new folder, /thumbnails. 
+* The code assumes that the destination bucket exists and is defined in the `template.yaml` file
+
+==============================================
+
+## Testing
+
+Run the following S3 CLI  command to upload an image to the S3 bucket. Note, you must edit the {SourceBucketName} placeholder with the name of the S3 Bucket. This is provided in the stack outputs.
+
+```bash
+aws s3 cp './images/example.jpeg'  s3://{BucketName}/example.jpeg
+```
+
+Run the following command to check that a new thumbnails folder has been created with a new version of the image.
+
+```bash
+aws s3 ls s3://{BucketName}/thumbnails
+```
+
+## Cleanup
+
+1. Delete the stack
+    ```bash
+    aws cloudformation delete-stack --stack-name STACK_NAME
+    ```
+1. Confirm the stack has been deleted
+    ```bash
+    aws cloudformation list-stacks --query "StackSummaries[?contains(StackName,'STACK_NAME')].StackStatus"
+    ```
+----
+Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+
+SPDX-License-Identifier: MIT-0

s3-lambda-resizing-dotnet/event.json

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+{
+  "Records": [
+    {
+      "eventVersion": "2.1",
+      "eventSource": "aws:s3",
+      "awsRegion": "us-east-1",
+      "eventTime": "2024-07-03T19:37:27.192Z",
+      "eventName": "ObjectCreated:Put",
+      "userIdentity": {
+        "principalId": "AWS:AIDAINPONIXQXHT3IKHL2"
+      },
+      "requestParameters": {
+        "sourceIPAddress": "205.255.255.255"
+      },
+      "responseElements": {
+        "x-amz-request-id": "D82B88E5F771F645",
+        "x-amz-id-2": "vlR7PnpV2Ce81l0PRw6jlUpck7Jo5ZsQjryTjKlc5aLWGVHPZLj5NeC6qMa0emYBDXOo6QBU0Wo="
+      },
+      "s3": {
+        "s3SchemaVersion": "1.0",
+        "configurationId": "828aa6fc-f7b5-4305-8584-487c791949c1",
+        "bucket": {
+          "name": "<provide-source-bucket-name-here>",
+          "ownerIdentity": {
+            "principalId": "A3I5XTEXAMAI3E"
+          },
+          "arn": "arn:aws:s3:::lambda-artifacts-deafc19498e3f2df"
+        },
+        "object": {
+          "key": "<provide-object-key-here>",
+          "size": 1305107,
+          "eTag": "b21b84d653bb07b05b1e6b33684dc11b",
+          "sequencer": "0C0F6F405D6ED209E1"
+        }
+      }
+    }
+  ]
+}