[#218] Add check content sha256 header

The X-Amz-Content-Sha256 header check is done only for unencrypted payload.

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

api/auth/center_test.go

@@ -99,3 +99,49 @@ func TestSignature(t *testing.T) {
 	signature := signStr(secret, "s3", "us-east-1", signTime, strToSign)
 	require.Equal(t, "dfbe886241d9e369cf4b329ca0f15eb27306c97aa1022cc0bb5a914c4ef87634", signature)
 }
+
+func TestCheckFormatContentSHA256(t *testing.T) {
+	defaultErr := errors.GetAPIError(errors.ErrContentSHA256Mismatch)
+
+	for _, tc := range []struct {
+		name  string
+		hash  string
+		error error
+	}{
+		{
+			name:  "invalid hash format: length and character",
+			hash:  "invalid-hash",
+			error: defaultErr,
+		},
+		{
+			name:  "invalid hash format: length (63 characters)",
+			hash:  "ed7002b439e9ac845f22357d822bac1444730fbdb6016d3ec9432297b9ec9f7",
+			error: defaultErr,
+		},
+		{
+			name:  "invalid hash format: character",
+			hash:  "ed7002b439e9ac845f22357d822bac1444730fbdb6016d3ec9432297b9ec9f7s",
+			error: defaultErr,
+		},
+		{
+			name:  "unsigned payload",
+			hash:  "UNSIGNED-PAYLOAD",
+			error: nil,
+		},
+		{
+			name:  "no hash",
+			hash:  "",
+			error: nil,
+		},
+		{
+			name:  "correct hash format",
+			hash:  "ed7002b439e9ac845f22357d822bac1444730fbdb6016d3ec9432297b9ec9f73",
+			error: nil,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			err := checkFormatHashContentSHA256(tc.hash)
+			require.Equal(t, tc.error, err)
+		})
+	}
+}