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