Use path.Clean to clean sigv4 path.

sigv4 package already calls EscapeURL, the proper fix would be to use
path.Clean.

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

sigv4/sigv4.go

@@ -20,6 +20,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/textproto"
+	"path"
 	"sync"
 	"time"
 
@@ -115,9 +116,9 @@ func (rt *sigV4RoundTripper) RoundTrip(req *http.Request) (*http.Response, error
 	}()
 	req.Body = ioutil.NopCloser(seeker)
 
-	// Escape URL like documented in AWS documentation.
-	// https://docs.aws.amazon.com/sdk-for-go/api/aws/signer/v4/#pkg-overview
-	req.URL.Path = req.URL.EscapedPath()
+	// Clean path like documented in AWS documentation.
+	// https://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
+	req.URL.Path = path.Clean(req.URL.Path)
 
 	// Clone the request and trim out headers that we don't want to sign.
 	signReq := req.Clone(req.Context())

sigv4/sigv4_test.go

@@ -64,7 +64,7 @@ func TestSigV4RoundTripper(t *testing.T) {
 
 	cli := &http.Client{Transport: rt}
 
-	req, err := http.NewRequest(http.MethodPost, "google.com", strings.NewReader("Hello, world!"))
+	req, err := http.NewRequest(http.MethodPost, "https://example.com", strings.NewReader("Hello, world!"))
 	require.NoError(t, err)
 
 	_, err = cli.Do(req)
@@ -78,7 +78,7 @@ func TestSigV4RoundTripper(t *testing.T) {
 	// Perform the same request but with a header that shouldn't included in the
 	// signature; validate that the Authorization signature matches.
 	t.Run("Ignored Headers", func(t *testing.T) {
-		req, err := http.NewRequest(http.MethodPost, "google.com", strings.NewReader("Hello, world!"))
+		req, err := http.NewRequest(http.MethodPost, "https://example.com", strings.NewReader("Hello, world!"))
 		require.NoError(t, err)
 
 		req.Header.Add("Uber-Trace-Id", "some-trace-id")
@@ -91,12 +91,14 @@ func TestSigV4RoundTripper(t *testing.T) {
 	})
 
 	t.Run("Escape URL", func(t *testing.T) {
-		req, err := http.NewRequest(http.MethodPost, "google.com/test//test", strings.NewReader("Hello, world!"))
+		req, err := http.NewRequest(http.MethodPost, "https://example.com/test//test", strings.NewReader("Hello, world!"))
 		require.NoError(t, err)
-		require.Equal(t, "google.com/test//test", req.URL.Path)
+		require.Equal(t, "/test//test", req.URL.Path)
 
-		// Escape URL and check
-		req.URL.Path = req.URL.EscapedPath()
-		require.Equal(t, "google.com/test/test", req.URL.Path)
+		_, err = cli.Do(req)
+		require.NoError(t, err)
+		require.NotNil(t, gotReq)
+
+		require.Equal(t, "/test/test", gotReq.URL.Path)
 	})
 }