formatting & doc

digest.go

@@ -27,11 +27,13 @@ type Options struct {
 	URI      string
 	GetBody  func() (io.ReadCloser, error)
 	Count    int
-	A1       string
 	Username string
 	Password string
 
-	// used for testing
+	// The following are provided for advanced use cases where the client needs
+	// to override the default digest calculation behavior. Most users should
+	// leave these fields unset.
+	A1     string
 	Cnonce string
 }
 
@@ -77,18 +79,16 @@ func Digest(chal *Challenge, o Options) (*Credentials, error) {
 	if cred.Userhash {
 		cred.Username = hashf(h, "%s:%s", o.Username, cred.Realm)
 	}
-
+	// generate the a1 hash if one was not provided
 	a1 := o.A1
-
 	if a1 == "" {
 		a1 = hashf(h, "%s:%s:%s", o.Username, cred.Realm, o.Password)
 	}
-
 	// generate the response
 	switch {
 	case len(chal.QOP) == 0:
 		cred.Response = hashf(h, "%s:%s:%s",
-			a1, // A1
+			a1,
 			cred.Nonce,
 			hashf(h, "%s:%s", o.Method, o.URI), // A2
 		)
@@ -101,7 +101,7 @@ func Digest(chal *Challenge, o Options) (*Credentials, error) {
 			cred.Nc = 1
 		}
 		cred.Response = hashf(h, "%s:%s:%08x:%s:%s:%s",
-			a1, // A1
+			a1,
 			cred.Nonce,
 			cred.Nc,
 			cred.Cnonce,
@@ -121,7 +121,7 @@ func Digest(chal *Challenge, o Options) (*Credentials, error) {
 			return nil, fmt.Errorf("digest: failed to read body for auth-int: %w", err)
 		}
 		cred.Response = hashf(h, "%s:%s:%08x:%s:%s:%s",
-			a1, // A1
+			a1,
 			cred.Nonce,
 			cred.Nc,
 			cred.Cnonce,

digest_test.go

@@ -112,10 +112,17 @@ func TestDigestSHA256(t *testing.T) {
 }
 
 func TestDigestA1(t *testing.T) {
+	h := sha256.New()
+	fmt.Fprintf(h, "%s:%s:%s",
+		"Mufasa",                // username
+		"[email protected]", // realm
+		"Circle of Life",        // password
+	)
+	a1 := hex.EncodeToString(h.Sum(nil))
 	opt := Options{
 		Method: "GET",
 		URI:    "/dir/index.html",
-		A1:     sha265Hash("%s:%s:%s", "Mufasa", "[email protected]", "Circle of Life"),
+		A1:     a1,
 		Cnonce: "f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ",
 	}
 	chal := &Challenge{
@@ -204,9 +211,3 @@ func TestDigestAuthInt(t *testing.T) {
 		Nc:        1,
 	})
 }
-
-func sha265Hash(format string, args ...interface{}) string {
-	h := sha256.New()
-	fmt.Fprintf(h, format, args...)
-	return hex.EncodeToString(h.Sum(nil))
-}