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email_config.go
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email_config.go
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// Copyright 2020 the Exposure Notifications Verification Server authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package database
import (
"context"
"github.com/google/exposure-notifications-verification-server/pkg/email"
"github.com/jinzhu/gorm"
)
// EmailConfig represents and email configuration.
type EmailConfig struct {
gorm.Model
Errorable
// email Config belongs to exactly one realm.
RealmID uint `gorm:"type:integer"`
// ProviderType is the email provider type - it's used to determine the
// underlying configuration.
ProviderType email.ProviderType `gorm:"type:varchar(100)"`
SMTPAccount string `gorm:"type:varchar(250)"`
SMTPHost string `gorm:"type:varchar(250)"`
SMTPPort string `gorm:"type:varchar(250)"`
// SMTPPassword is encrypted/decrypted automatically by callbacks. The
// cache fields exist as optimizations.
SMTPPassword string `gorm:"type:varchar(250)" json:"-"` // ignored by zap's JSON formatter
SMTPPasswordPlaintextCache string `gorm:"-"`
SMTPPasswordCiphertextCache string `gorm:"-"`
// IsSystem determines if this is a system-level email configuration. There can
// only be one system-level email configuration.
IsSystem bool `gorm:"type:bool; not null; default:false;"`
}
func (e *EmailConfig) BeforeSave(tx *gorm.DB) error {
// Email config is all or nothing
if (e.SMTPAccount != "" || e.SMTPPassword != "" || e.SMTPHost != "") &&
(e.SMTPAccount == "" || e.SMTPPassword == "" || e.SMTPHost == "") {
e.AddError("SMTPAccount", "all must be specified or all must be blank")
e.AddError("SMTPPassword", "all must be specified or all must be blank")
e.AddError("SMTPHost", "all must be specified or all must be blank")
}
return e.ErrorOrNil()
}
func (e *EmailConfig) Provider() (email.Provider, error) {
ctx := context.Background()
provider, err := email.ProviderFor(ctx, &email.Config{
ProviderType: e.ProviderType,
User: e.SMTPAccount,
Password: e.SMTPPassword,
SMTPHost: e.SMTPHost,
SMTPPort: e.SMTPPort,
})
if err != nil {
return nil, err
}
return provider, nil
}
// SystemEmailConfig returns the system email config, if one exists
func (db *Database) SystemEmailConfig() (*EmailConfig, error) {
var emailConfig EmailConfig
if err := db.db.
Model(&EmailConfig{}).
Where("is_system IS TRUE").
First(&emailConfig).
Error; err != nil {
return nil, err
}
return &emailConfig, nil
}
// SaveEmailConfig creates or updates an email configuration record.
func (db *Database) SaveEmailConfig(s *EmailConfig) error {
if s.SMTPAccount == "" && s.SMTPPassword == "" && s.SMTPHost == "" {
if db.db.NewRecord(s) {
// The fields are all blank, do not create the record.
return nil
}
if s.IsSystem {
// We're about to delete the system email config, revoke everyone's
// permissions to use it. You would think there'd be a way to do this with
// gorm natively. You'd even find an example in the documentation that led
// you to believe that gorm does this.
//
// Narrator: gorm does not do this.
if err := db.db.
Exec(`UPDATE realms SET can_use_system_email_config = FALSE, use_system_email_config = FALSE`).
Error; err != nil {
return err
}
}
// The fields were blank, delete the email config.
return db.db.Unscoped().Delete(s).Error
}
return db.db.Save(s).Error
}