/// <summary>
/// A function for responding to S3 create events. It will determine if the object is an image and use Amazon Rekognition
/// to detect labels and add the labels as tags on the S3 object.
/// </summary>
/// <param name="input"></param>
/// <param name="context"></param>
/// <returns></returns>
public async Task FunctionHandler(S3Event input, ILambdaContext context)
{
try
{
foreach (var record in input.Records)
{
if (!SupportedImageTypes.Contains(Path.GetExtension(record.S3.Object.Key)))
{
Console.WriteLine($"Object {record.S3.Bucket.Name}:{record.S3.Object.Key} is not a supported image type");
continue;
}
Console.WriteLine($"Looking for labels in image {record.S3.Bucket.Name}:{record.S3.Object.Key}");
var detectResponses = await this.RekognitionClient.DetectLabelsAsync(new DetectLabelsRequest
{
MinConfidence = MinConfidence,
Image = new Image
{
S3Object = new Amazon.Rekognition.Model.S3Object
{
Bucket = record.S3.Bucket.Name,
Name = record.S3.Object.Key
}
}
});
var tags = new List <Tag>();
foreach (var label in detectResponses.Labels)
{
if (tags.Count < 10)
{
Console.WriteLine($"\tFound Label {label.Name} with confidence {label.Confidence}");
tags.Add(new Tag {
Key = label.Name, Value = label.Confidence.ToString()
});
}
else
{
Console.WriteLine($"\tSkipped label {label.Name} with confidence {label.Confidence} because the maximum number of tags has been reached");
}
}
await this.S3Client.PutObjectTaggingAsync(new PutObjectTaggingRequest
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key,
Tagging = new Tagging
{
TagSet = tags
}
});
}
return;
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
/// <summary>
/// This method is called for every Lambda invocation. This method takes in an S3 event object and can be used
/// to respond to S3 notifications.
/// </summary>
/// <param name="evnt"></param>
/// <param name="context"></param>
/// <returns></returns>
public async Task FunctionHandler(JObject input, ILambdaContext context)
{
String bucket = (string)input["detail"]["requestParameters"]["bucketName"];
String key = (string)input["detail"]["requestParameters"]["key"];
if (!SupportedImageTypes.Contains(Path.GetExtension(key)))
{
Console.WriteLine($"Object {bucket}:{key} is not a supported image type");
return;
}
try
{
var rs = await this.S3Client.GetObjectMetadataAsync(
bucket,
key);
if (rs.Headers.ContentType.StartsWith("image/"))
{
using (GetObjectResponse response = await S3Client.GetObjectAsync(
bucket,
key))
{
using (Stream responseStream = response.ResponseStream)
{
using (StreamReader reader = new StreamReader(responseStream))
{
using (var memstream = new MemoryStream())
{
var buffer = new byte[512];
var bytesRead = default(int);
while ((bytesRead = reader.BaseStream.Read(buffer, 0, buffer.Length)) > 0)
{
memstream.Write(buffer, 0, bytesRead);
}
// Perform image manipulation
Stream transformedImage = GcImagingOperations.GetConvertedImage(memstream.ToArray());
PutObjectRequest putRequest = new PutObjectRequest()
{
BucketName = this.TargetBucket,
Key = $"thumbnail-{key}",
ContentType = rs.Headers.ContentType,
InputStream = transformedImage
};
await S3Client.PutObjectAsync(putRequest);
}
}
}
}
}
return;
}
catch (Exception e)
{
throw;
}
}
/// <summary>
/// 値をコントロールに反映します。
/// </summary>
/// <param name="imgTypes">設定する値を表すSupportedImageTypes。</param>
private void setValueToControl(SupportedImageTypes imgTypes)
{
this.targetImages = imgTypes;
this.chkBitmap.Checked = ((imgTypes & SupportedImageTypes.Bitmap) != 0);
this.chkGif.Checked = ((imgTypes & SupportedImageTypes.Gif) != 0);
this.chkJpeg.Checked = ((imgTypes & SupportedImageTypes.Jpeg) != 0);
this.chkPng.Checked = ((imgTypes & SupportedImageTypes.Png) != 0);
}
/// <summary>
/// チェックボックスのCheckdChangedイベントハンドラ。
/// </summary>
/// <param name="sender">イベントのソース。</param>
/// <param name="e">イベントデータを格納しているEventArgs。</param>
private void checkBox_CheckdChanged(object sender, System.EventArgs e)
{
CheckBox chkBox = (CheckBox)sender;
if (chkBox.Checked)
{
this.targetImages |= (SupportedImageTypes)chkBox.Tag;
}
else
{
this.targetImages &= ~(SupportedImageTypes)chkBox.Tag;
}
}
/// <summary>
/// コンストラクタ。
/// </summary>
/// <param name="imageTypes">ThumbNailView.TargetExtensionsプロパティを設定します。</param>
/// <param name="editorService">プロパティエディタのサービスを表すIWindowsFormsEditorService。</param>
public TargetExtensionEditorControl(SupportedImageTypes imageTypes, IWindowsFormsEditorService editorService) : this()
{
this.setValueToControl(imageTypes);
this.editServ = editorService;
}
