119 lines
3.9 KiB
Go
119 lines
3.9 KiB
Go
package v4a
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import (
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"context"
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"fmt"
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awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
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v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
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internalauth "github.com/aws/aws-sdk-go-v2/internal/auth"
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"github.com/aws/smithy-go/middleware"
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smithyhttp "github.com/aws/smithy-go/transport/http"
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"net/http"
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"time"
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)
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// HTTPSigner is SigV4a HTTP signer implementation
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type HTTPSigner interface {
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SignHTTP(ctx context.Context, credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, optfns ...func(*SignerOptions)) error
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}
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// SignHTTPRequestMiddlewareOptions is the middleware options for constructing a SignHTTPRequestMiddleware.
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type SignHTTPRequestMiddlewareOptions struct {
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Credentials CredentialsProvider
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Signer HTTPSigner
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LogSigning bool
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}
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// SignHTTPRequestMiddleware is a middleware for signing an HTTP request using SigV4a.
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type SignHTTPRequestMiddleware struct {
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credentials CredentialsProvider
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signer HTTPSigner
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logSigning bool
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}
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// NewSignHTTPRequestMiddleware constructs a SignHTTPRequestMiddleware using the given SignHTTPRequestMiddlewareOptions.
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func NewSignHTTPRequestMiddleware(options SignHTTPRequestMiddlewareOptions) *SignHTTPRequestMiddleware {
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return &SignHTTPRequestMiddleware{
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credentials: options.Credentials,
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signer: options.Signer,
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logSigning: options.LogSigning,
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}
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}
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// ID the middleware identifier.
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func (s *SignHTTPRequestMiddleware) ID() string {
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return "Signing"
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}
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// HandleFinalize signs an HTTP request using SigV4a.
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func (s *SignHTTPRequestMiddleware) HandleFinalize(
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ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
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) (
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out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
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) {
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if !hasCredentialProvider(s.credentials) {
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return next.HandleFinalize(ctx, in)
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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 out, metadata, fmt.Errorf("unexpected request middleware type %T", in.Request)
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}
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signingName, signingRegion := awsmiddleware.GetSigningName(ctx), awsmiddleware.GetSigningRegion(ctx)
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payloadHash := v4.GetPayloadHash(ctx)
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if len(payloadHash) == 0 {
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return out, metadata, &SigningError{Err: fmt.Errorf("computed payload hash missing from context")}
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}
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credentials, err := s.credentials.RetrievePrivateKey(ctx)
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if err != nil {
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return out, metadata, &SigningError{Err: fmt.Errorf("failed to retrieve credentials: %w", err)}
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}
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signerOptions := []func(o *SignerOptions){
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func(o *SignerOptions) {
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o.Logger = middleware.GetLogger(ctx)
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o.LogSigning = s.logSigning
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},
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}
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// existing DisableURIPathEscaping is equivalent in purpose
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// to authentication scheme property DisableDoubleEncoding
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disableDoubleEncoding, overridden := internalauth.GetDisableDoubleEncoding(ctx)
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if overridden {
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signerOptions = append(signerOptions, func(o *SignerOptions) {
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o.DisableURIPathEscaping = disableDoubleEncoding
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})
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}
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err = s.signer.SignHTTP(ctx, credentials, req.Request, payloadHash, signingName, []string{signingRegion}, time.Now().UTC(), signerOptions...)
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if err != nil {
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return out, metadata, &SigningError{Err: fmt.Errorf("failed to sign http request, %w", err)}
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}
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return next.HandleFinalize(ctx, in)
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}
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func hasCredentialProvider(p CredentialsProvider) bool {
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if p == nil {
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return false
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}
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return true
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}
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// RegisterSigningMiddleware registers the SigV4a signing middleware to the stack. If a signing middleware is already
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// present, this provided middleware will be swapped. Otherwise the middleware will be added at the tail of the
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// finalize step.
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func RegisterSigningMiddleware(stack *middleware.Stack, signingMiddleware *SignHTTPRequestMiddleware) (err error) {
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const signedID = "Signing"
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_, present := stack.Finalize.Get(signedID)
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if present {
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_, err = stack.Finalize.Swap(signedID, signingMiddleware)
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} else {
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err = stack.Finalize.Add(signingMiddleware, middleware.After)
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}
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return err
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}
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