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package endpointdiscovery
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
smithyhttp "github.com/aws/smithy-go/transport/http"
"github.com/aws/smithy-go/logging"
"github.com/aws/smithy-go/middleware"
)
// DiscoverEndpointOptions are optionals used with DiscoverEndpoint operation.
type DiscoverEndpointOptions struct {
// EndpointResolverUsedForDiscovery is the endpoint resolver used to
// resolve an endpoint for discovery api call.
EndpointResolverUsedForDiscovery interface{}
// DisableHTTPS will disable tls for endpoint discovery call and
// subsequent discovered endpoint if service did not return an
// endpoint scheme.
DisableHTTPS bool
// Logger to log warnings or debug statements.
Logger logging.Logger
}
// DiscoverEndpoint is a finalize step middleware used to discover endpoint
// for an API operation.
type DiscoverEndpoint struct {
// Options provides optional settings used with
// Discover Endpoint operation.
Options []func(*DiscoverEndpointOptions)
// DiscoverOperation represents the endpoint discovery operation that
// returns an Endpoint or error.
DiscoverOperation func(ctx context.Context, region string, options ...func(*DiscoverEndpointOptions)) (WeightedAddress, error)
// EndpointDiscoveryEnableState represents the customer configuration for endpoint
// discovery feature.
EndpointDiscoveryEnableState aws.EndpointDiscoveryEnableState
// EndpointDiscoveryRequired states if an operation requires to perform
// endpoint discovery.
EndpointDiscoveryRequired bool
// The client region
Region string
}
// ID represents the middleware identifier
func (*DiscoverEndpoint) ID() string {
return "DiscoverEndpoint"
}
// HandleFinalize performs endpoint discovery and updates the request host with
// the result.
//
// The resolved host from this procedure MUST override that of modeled endpoint
// resolution and middleware should be ordered accordingly.
func (d *DiscoverEndpoint) HandleFinalize(
ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
) (out middleware.FinalizeOutput, metadata middleware.Metadata, err error) {
if d.EndpointDiscoveryEnableState == aws.EndpointDiscoveryDisabled {
return next.HandleFinalize(ctx, in)
}
if !d.EndpointDiscoveryRequired && d.EndpointDiscoveryEnableState != aws.EndpointDiscoveryEnabled {
return next.HandleFinalize(ctx, in)
}
if es := awsmiddleware.GetEndpointSource(ctx); es == aws.EndpointSourceCustom {
if d.EndpointDiscoveryEnableState == aws.EndpointDiscoveryEnabled {
return middleware.FinalizeOutput{}, middleware.Metadata{},
fmt.Errorf("Invalid configuration: endpoint discovery is enabled, but a custom endpoint is provided")
}
return next.HandleFinalize(ctx, in)
}
weightedAddress, err := d.DiscoverOperation(ctx, d.Region, d.Options...)
if err != nil {
return middleware.FinalizeOutput{}, middleware.Metadata{}, err
}
req, ok := in.Request.(*smithyhttp.Request)
if !ok {
return middleware.FinalizeOutput{}, middleware.Metadata{},
fmt.Errorf("expected request to be of type *smithyhttp.Request, got %T", in.Request)
}
if weightedAddress.URL != nil {
// we only want the host, normal endpoint resolution can include path/query
req.URL.Host = weightedAddress.URL.Host
}
return next.HandleFinalize(ctx, in)
}
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