public bool Build(TransformBuilderContext context, IReadOnlyDictionary<string, string> transformValues)
{
if (transformValues.TryGetValue(RequestHeadersCopyKey, out var copyHeaders))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 1);
context.CopyRequestHeaders = bool.Parse(copyHeaders);
}
else if (transformValues.TryGetValue(RequestHeaderOriginalHostKey, out var originalHost))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 1);
context.AddOriginalHost(bool.Parse(originalHost));
}
else if (transformValues.TryGetValue(RequestHeaderKey, out var headerName))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 2);
if (transformValues.TryGetValue(SetKey, out var setValue))
{
context.AddRequestHeader(headerName, setValue, append: false);
}
else if (transformValues.TryGetValue(AppendKey, out var appendValue))
{
context.AddRequestHeader(headerName, appendValue, append: true);
}
else
{
throw new ArgumentException($"Unexpected parameters for RequestHeader: {string.Join(';', transformValues.Keys)}. Expected 'Set' or 'Append'");
}
}
else
{
return false;
}
return true;
}
private static StructuredTransformer CreateTransformer(TransformBuilderContext context)
{
// RequestHeaderOriginalHostKey defaults to false, and CopyRequestHeaders defaults to true.
// If RequestHeaderOriginalHostKey was not specified then we need to make sure the transform gets
// added anyways to remove the original host. If CopyRequestHeaders is false then we can omit the
// transform.
if (context.CopyRequestHeaders.GetValueOrDefault(true) &&
!context.RequestTransforms.Any(item => item is RequestHeaderOriginalHostTransform))
{
context.AddOriginalHost(false);
}
// Add default forwarders only if they haven't already been added or disabled.
if (context.UseDefaultForwarders.GetValueOrDefault(true))
{
context.AddXForwarded();
}
return(new StructuredTransformer(
context.CopyRequestHeaders,
context.CopyResponseHeaders,
context.CopyResponseTrailers,
context.RequestTransforms,
context.ResponseTransforms,
context.ResponseTrailersTransforms));
}
public bool Build(TransformBuilderContext context, IReadOnlyDictionary <string, string> transformValues)
{
if (transformValues.TryGetValue(RequestHeadersCopyKey, out var copyHeaders))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 1);
context.CopyRequestHeaders = bool.Parse(copyHeaders);
}
else if (transformValues.TryGetValue(RequestHeaderOriginalHostKey, out var originalHost))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 1);
context.AddOriginalHost(bool.Parse(originalHost));
}
else if (transformValues.TryGetValue(RequestHeaderKey, out var headerName))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 2);
if (transformValues.TryGetValue(SetKey, out var setValue))
{
context.AddRequestHeader(headerName, setValue, append: false);
}
else if (transformValues.TryGetValue(AppendKey, out var appendValue))
{
context.AddRequestHeader(headerName, appendValue, append: true);
}
else
{
throw new ArgumentException($"Unexpected parameters for RequestHeader: {string.Join(';', transformValues.Keys)}. Expected 'Set' or 'Append'");
}
}
else if (transformValues.TryGetValue(RequestHeaderRemoveKey, out var removeHeaderName))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 1);
context.AddRequestHeaderRemove(removeHeaderName);
}
else if (transformValues.TryGetValue(RequestHeadersAllowedKey, out var allowedHeaders))
{
TransformHelpers.CheckTooManyParameters(transformValues, expected: 1);
var headersList = allowedHeaders.Split(';', options: StringSplitOptions.RemoveEmptyEntries
#if NET
| StringSplitOptions.TrimEntries
#endif
);
context.AddRequestHeadersAllowed(headersList);
}
else
{
return(false);
}
return(true);
}
// This is separate from Build for testing purposes.
internal StructuredTransformer BuildInternal(ProxyRoute route, Cluster cluster)
{
var rawTransforms = route.Transforms;
var context = new TransformBuilderContext
{
Services = _services,
Route = route,
Cluster = cluster,
};
if (rawTransforms?.Count > 0)
{
foreach (var rawTransform in rawTransforms)
{
var handled = false;
foreach (var factory in _factories)
{
if (factory.Build(context, rawTransform))
{
handled = true;
break;
}
}
if (!handled)
{
throw new ArgumentException($"Unknown transform: {string.Join(';', rawTransform.Keys)}");
}
}
}
// Let the app add any more transforms it wants.
foreach (var transformProvider in _providers)
{
transformProvider.Apply(context);
}
// RequestHeaderOriginalHostKey defaults to false, and CopyRequestHeaders defaults to true.
// If RequestHeaderOriginalHostKey was not specified then we need to make sure the transform gets
// added anyways to remove the original host. If CopyRequestHeaders is false then we can omit the
// transform.
if (context.CopyRequestHeaders.GetValueOrDefault(true) &&
!context.RequestTransforms.Any(item => item is RequestHeaderOriginalHostTransform))
{
context.AddOriginalHost(false);
}
// Add default forwarders only if they haven't already been added or disabled.
if (context.UseDefaultForwarders.GetValueOrDefault(true))
{
context.AddXForwarded();
}
return(new StructuredTransformer(
context.CopyRequestHeaders,
context.CopyResponseHeaders,
context.CopyResponseTrailers,
context.RequestTransforms,
context.ResponseTransforms,
context.ResponseTrailersTransforms));
}