Add unit tests for singleAuthHeader

Also rename it to parseSingleAuthHeader

Should not change behavior.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

pkg/auth/auth.go

@@ -115,7 +115,7 @@ func getAuthCredentials(r *http.Request) (*types.DockerAuthConfig, string, error
 	}
 
 	// Fallback to looking for a single-auth header (i.e., one config).
-	authConfigs, err = singleAuthHeader(r)
+	authConfigs, err = parseSingleAuthHeader(r)
 	if err != nil {
 		return nil, "", err
 	}
@@ -309,9 +309,9 @@ func imageAuthToDockerAuth(authConfig types.DockerAuthConfig) dockerAPITypes.Aut
 	}
 }
 
-// singleAuthHeader extracts a DockerAuthConfig from the request's header.
+// parseSingleAuthHeader extracts a DockerAuthConfig from the request's header.
 // The header content is a single DockerAuthConfig.
-func singleAuthHeader(r *http.Request) (map[string]types.DockerAuthConfig, error) {
+func parseSingleAuthHeader(r *http.Request) (map[string]types.DockerAuthConfig, error) {
 	authHeader := r.Header.Get(string(XRegistryAuthHeader))
 	authConfig := dockerAPITypes.AuthConfig{}
 	// Accept "null" and handle it as empty value for compatibility reason with Docker.

pkg/auth/auth_test.go

@@ -68,6 +68,43 @@ func TestAuthConfigsToAuthFile(t *testing.T) {
 	}
 }
 
+func TestParseSingleAuthHeader(t *testing.T) {
+	for _, tc := range []struct {
+		input     string
+		shouldErr bool
+		expected  map[string]types.DockerAuthConfig
+	}{
+		{
+			input:    "", // An empty (or missing) header
+			expected: map[string]types.DockerAuthConfig{"0": {}},
+		},
+		{
+			input:    "null",
+			expected: map[string]types.DockerAuthConfig{"0": {}},
+		},
+		// Invalid JSON
+		{input: "@", shouldErr: true},
+		// Success
+		{
+			input: base64.URLEncoding.EncodeToString([]byte(`{"username":"u1","password":"p1"}`)),
+			expected: map[string]types.DockerAuthConfig{
+				"0": {Username: "u1", Password: "p1"},
+			},
+		},
+	} {
+		req, err := http.NewRequest(http.MethodPost, "/", nil)
+		require.NoError(t, err, tc.input)
+		req.Header.Set(XRegistryAuthHeader.String(), tc.input)
+		res, err := parseSingleAuthHeader(req)
+		if tc.shouldErr {
+			assert.Error(t, err, tc.input)
+		} else {
+			require.NoError(t, err, tc.input)
+			assert.Equal(t, tc.expected, res, tc.input)
+		}
+	}
+}
+
 func TestParseMultiAuthHeader(t *testing.T) {
 	for _, tc := range []struct {
 		input     string