protected virtual async ValueTask <AnalyzeOperationContext> GetOperationContextAsync(
IImageSource source,
string endpoint,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (source is ISerializableImageResource ssource)
{
// source image is json-serializable
if (await IsJsonSerializationSupportedAsync(endpoint, cancellationToken).ConfigureAwait(false))
{
// both remote server and image source support json-serialization
// NOTE: Destination is always inline --> not used on server
var payload = new SourceAndDestination(ssource.Uri, null);
var producer = StreamProducer.Create((ouput, cancellationToken) => new ValueTask(JsonSerializer.SerializeAsync(ouput, payload, _sourceAndDestinationSerializationOptions, cancellationToken)));
return(AnalyzeOperationContext.Json(producer));
}
// remote server does not support json-serialization
if (Configuration.AllowInlineData)
{
// remote server does not support json-serialized images but the inline data is enabled --> proceed
Logger.LogWarning("Source image supports json serialization but remote server does not thus inline data will be used.");
return(AnalyzeOperationContext.Inline(source.CreateProducer()));
}
// remote server does not support json-serialized images and the inline data is disabled --> throw exception
throw new InvalidOperationException("Source image supports json serialization but remote server does not. Either enable inline data or use compatible server.");
}
// source image is not json-serializable
if (!Configuration.AllowInlineData)
{
throw new InvalidOperationException("Source image does not support json serialization. Either enable inline data or use json-serializable image source.");
}
return(AnalyzeOperationContext.Inline(source.CreateProducer()));
}
protected virtual async ValueTask <ResizeOperationContext> GetOperationContextAsync(
IImageSource source,
IImageDestination destination,
string endpoint,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (source is ISerializableImageResource ssource)
{
// source image is json-serializable
if (await IsJsonSerializationSupportedAsync(endpoint, cancellationToken).ConfigureAwait(false))
{
// both remote server and image source support json-serialization
SourceAndDestination payload;
IImageDestination? dest;
if (destination is ISerializableImageResource sdestination)
{
// image destination does also support json-serialization --> destination in payload, no consumer.
payload = new SourceAndDestination(ssource.Uri, sdestination.Uri);
dest = default;
}
else
{
// image destination does also support json-serialization --> null in payload, destination is the consumer.
payload = new SourceAndDestination(ssource.Uri, default);
dest = destination;
}
var producer = StreamProducer.Create((ouput, cancellationToken) => new ValueTask(JsonSerializer.SerializeAsync(ouput, payload, _sourceAndDestinationSerializationOptions, cancellationToken)));
return(ResizeOperationContext.Json(producer, dest));
}
// remote server does not support json-serialization
if (Configuration.AllowInlineData)
{
// remote server does not support json-serialized images but the inline data is enabled --> proceed
Logger.LogWarning("Source image supports json serialization but remote server does not thus inline data will be used.");
return(ResizeOperationContext.Inline(source.CreateProducer(), destination));
}
// remote server does not support json-serialized images and the inline data is disabled --> throw exception
throw new InvalidOperationException("Source image supports json serialization but remote server does not. Either enable inline data or use compatible server.");
}
// source image is not json-serializable
if (!Configuration.AllowInlineData)
{
throw new InvalidOperationException("Source image does not support json serialization. Either enable inline data or use json-serializable image source.");
}
if (destination is ISerializableImageResource)
{
if (Configuration.AllowInlineData)
{
Logger.LogWarning("Json serializable destination is ignored as source is not json serializable.");
}
else
{
throw new InvalidOperationException("Destination cannot be json serialized when source is not json serializable.");
}
}
return(ResizeOperationContext.Inline(source.CreateProducer(), destination));
}