public async Task FunctionHandler(S3Event s3Event, ILambdaContext context)
{
foreach (var record in s3Event.Records)
{
if (!_supportedImageTypes.Contains(Path.GetExtension(record.S3.Object.Key).ToLower()))
{
Console.WriteLine($"Object {record.S3.Bucket.Name}:{record.S3.Object.Key} is not a supported image type");
continue;
}
Console.WriteLine($"Determining whether image {record.S3.Bucket.Name}:{record.S3.Object.Key} has been compressed");
// Get the existing tag set
var taggingResponse = await _s3Client.GetObjectTaggingAsync(new GetObjectTaggingRequest
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key
});
if (taggingResponse.Tagging.Any(tag => tag.Key == "Compressed" && tag.Value == "true"))
{
Console.WriteLine($"Image {record.S3.Bucket.Name}:{record.S3.Object.Key} has already been compressed");
continue;
}
// Get the existing image
using (var objectResponse = await _s3Client.GetObjectAsync(record.S3.Bucket.Name, record.S3.Object.Key))
using (Stream responseStream = objectResponse.ResponseStream)
{
Console.WriteLine($"Compressing image {record.S3.Bucket.Name}:{record.S3.Object.Key}");
// Use TinyPNG to compress the image
TinyPngClient tinyPngClient = new TinyPngClient(Environment.GetEnvironmentVariable("TinyPNG_API_Key"));
var compressResponse = await tinyPngClient.Compress(responseStream);
var downloadResponse = await tinyPngClient.Download(compressResponse);
// Upload the compressed image back to S3
using (var compressedStream = await downloadResponse.GetImageStreamData())
{
Console.WriteLine($"Uploading compressed image {record.S3.Bucket.Name}:{record.S3.Object.Key}");
await _s3Client.PutObjectAsync(new PutObjectRequest
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key,
InputStream = compressedStream,
TagSet = new List <Tag>
{
new Tag
{
Key = "Compressed",
Value = "true"
}
}
});
}
}
}
}
public async Task CompressionAndDownload()
{
var pngx = new TinyPngClient(apiKey);
pngx.httpClient = new HttpClient(new FakeResponseHandler()
.Compress()
.Download());
var result = await pngx.Compress(Cat);
var downloadResult = await pngx.Download(result);
Assert.Equal(16646, (await downloadResult.GetImageByteData()).Length);
}