We build too many walls and not enough bridges

pkg/pmapi/res.go

@@ -0,0 +1,72 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package pmapi
+
+// Common response codes.
+const (
+	CodeOk = 1000
+)
+
+// Res is an API response.
+type Res struct {
+	// The response code is the code from the body JSON. It's still used,
+	// but preference is to use HTTP status code instead for new changes.
+	Code       int
+	StatusCode int
+
+	// The error, if there is any.
+	*ResError
+}
+
+// Err returns error if the response is an error. Otherwise, returns nil.
+func (res Res) Err() error {
+	if res.ResError == nil {
+		return nil
+	}
+
+	if res.Code == ForceUpgradeBadAPIVersion ||
+		res.Code == ForceUpgradeInvalidAPI ||
+		res.Code == ForceUpgradeBadAppVersion {
+		return ErrUpgradeApplication
+	}
+
+	if res.Code == APIOffline {
+		return ErrAPINotReachable
+	}
+
+	return &Error{
+		Code:         res.Code,
+		ErrorMessage: res.ResError.Error,
+	}
+}
+
+type ResError struct {
+	Error string
+}
+
+// Error is an API error.
+type Error struct {
+	// The error code.
+	Code int
+	// The error message.
+	ErrorMessage string `json:"Error"`
+}
+
+func (err Error) Error() string {
+	return err.ErrorMessage
+}