Add ability to sign requests for all AWS services

sigv4/sigv4.go

@@ -37,9 +37,10 @@ var sigv4HeaderDenylist = []string{
 }
 
 type sigV4RoundTripper struct {
-	region string
-	next   http.RoundTripper
-	pool   sync.Pool
+	region  string
+	next    http.RoundTripper
+	pool    sync.Pool
+	service string
 
 	signer *signer.Signer
 }
@@ -88,11 +89,15 @@ func NewSigV4RoundTripper(cfg *SigV4Config, next http.RoundTripper) (http.RoundT
 	if cfg.RoleARN != "" {
 		signerCreds = stscreds.NewCredentials(sess, cfg.RoleARN)
 	}
+	if cfg.Service == "" {
+		cfg.Service = "aps"
+	}
 
 	rt := &sigV4RoundTripper{
-		region: cfg.Region,
-		next:   next,
-		signer: signer.NewSigner(signerCreds),
+		region:  cfg.Region,
+		next:    next,
+		signer:  signer.NewSigner(signerCreds),
+		service: cfg.Service,
 	}
 	rt.pool.New = rt.newBuf
 	return rt, nil
@@ -136,7 +141,7 @@ func (rt *sigV4RoundTripper) RoundTrip(req *http.Request) (*http.Response, error
 		signReq.Header.Del(header)
 	}
 
-	headers, err := rt.signer.Sign(signReq, seeker, "aps", rt.region, time.Now().UTC())
+	headers, err := rt.signer.Sign(signReq, seeker, rt.service, rt.region, time.Now().UTC())
 	if err != nil {
 		return nil, fmt.Errorf("failed to sign request: %w", err)
 	}

sigv4/sigv4_config.go

@@ -29,6 +29,7 @@ type SigV4Config struct {
 	Profile            string        `yaml:"profile,omitempty"`
 	RoleARN            string        `yaml:"role_arn,omitempty"`
 	UseFIPSSTSEndpoint bool          `yaml:"use_fips_sts_endpoint,omitempty"`
+	Service   		   string        `yaml:"service,omitempty"`
 }
 
 func (c *SigV4Config) Validate() error {

sigv4/sigv4_config_test.go

@@ -47,6 +47,13 @@ func TestGoodSigV4Configs(t *testing.T) {
 	}
 }
 
+func TestGoodSigV4ServiceConfigs(t *testing.T) {
+	filesToTest := []string{"testdata/sigv4_good_service.yaml", "testdata/sigv4_good_service.yaml"}
+	for _, filename := range filesToTest {
+		testGoodConfig(t, filename)
+	}
+}
+
 func TestBadSigV4Config(t *testing.T) {
 	filename := "testdata/sigv4_bad.yaml"
 	_, err := loadSigv4Config(filename)

sigv4/testdata/sigv4_good_service.yaml

@@ -0,0 +1,4 @@
+region: us-east-2
+profile: profile
+role_arn: blah:role/arn
+service: exectute-api