in processing-pipelines/image-v1/watermarker/csharp/Startup.cs [39:98]
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILogger<Startup> logger)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
logger.LogInformation("Service is starting...");
app.UseRouting();
var eventReader = new CloudEventReader(logger);
var configReader = new ConfigReader(logger);
var outputBucket = configReader.Read("BUCKET");
var fontCollection = new FontCollection();
fontCollection.Install("Arial.ttf");
var font = fontCollection.CreateFont("Arial", 10);
app.UseEndpoints(endpoints =>
{
endpoints.MapPost("/", async context =>
{
try
{
var (bucket, name) = await eventReader.ReadCloudStorageData(context);
using (var inputStream = new MemoryStream())
{
var client = await StorageClient.CreateAsync();
await client.DownloadObjectAsync(bucket, name, inputStream);
logger.LogInformation($"Downloaded '{name}' from bucket '{bucket}'");
using (var outputStream = new MemoryStream())
{
inputStream.Position = 0; // Reset to read
using (var image = Image.Load(inputStream))
{
using (var imageProcessed = image.Clone(ctx => ApplyScalingWaterMarkSimple(ctx, font, Watermark, Color.DeepSkyBlue, 5)))
{
logger.LogInformation($"Added watermark to image '{name}'");
imageProcessed.SaveAsJpeg(outputStream);
}
}
var outputObjectName = $"{Path.GetFileNameWithoutExtension(name)}-watermark.jpeg";
await client.UploadObjectAsync(outputBucket, outputObjectName, "image/jpeg", outputStream);
logger.LogInformation($"Uploaded '{outputObjectName}' to bucket '{outputBucket}'");
}
}
}
catch (Exception e)
{
logger.LogError($"Error processing: " + e.Message);
throw e;
}
});
});
}