Initial QSfera import

Server/vendor/github.com/opencloud-eu/reva/v2/pkg/smtpclient/smtpclient.go

@@ -0,0 +1,140 @@
+// Copyright 2018-2021 CERN
+//
+// 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.
+//
+// In applying this license, CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+package smtpclient
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"net/smtp"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/pkg/errors"
+)
+
+// SMTPCredentials stores the credentials required to connect to an SMTP server.
+type SMTPCredentials struct {
+	SenderLogin    string `mapstructure:"sender_login" docs:";The login to be used by sender."`
+	SenderMail     string `mapstructure:"sender_mail" docs:";The email to be used to send mails."`
+	SenderPassword string `mapstructure:"sender_password" docs:";The sender's password."`
+	SMTPServer     string `mapstructure:"smtp_server" docs:";The hostname of the SMTP server."`
+	SMTPPort       int    `mapstructure:"smtp_port" docs:"587;The port on which the SMTP daemon is running."`
+	DisableAuth    bool   `mapstructure:"disable_auth" docs:"false;Whether to disable SMTP auth."`
+	LocalName      string `mapstructure:"local_name" docs:";The host name to be used for unauthenticated SMTP."`
+}
+
+// NewSMTPCredentials creates a new SMTPCredentials object with the details of the passed object with sane defaults.
+func NewSMTPCredentials(c *SMTPCredentials) *SMTPCredentials {
+	creds := c
+
+	if creds.SMTPPort == 0 {
+		creds.SMTPPort = 587
+	}
+	if !creds.DisableAuth && creds.SenderPassword == "" {
+		creds.SenderPassword = os.Getenv("REVA_SMTP_SENDER_PASSWORD")
+	}
+	if creds.LocalName == "" {
+		tokens := strings.Split(creds.SenderMail, "@")
+		creds.LocalName = tokens[len(tokens)-1]
+	}
+	if creds.SenderLogin == "" {
+		creds.SenderLogin = creds.SenderMail
+	}
+	return creds
+}
+
+// SendMail allows sending mails using a set of client credentials.
+func (creds *SMTPCredentials) SendMail(recipient, subject, body string) error {
+
+	headers := map[string]string{
+		"From":                      creds.SenderMail,
+		"To":                        recipient,
+		"Subject":                   subject,
+		"Date":                      time.Now().Format(time.RFC1123Z),
+		"Message-ID":                uuid.New().String(),
+		"MIME-Version":              "1.0",
+		"Content-Type":              "text/plain; charset=\"utf-8\"",
+		"Content-Transfer-Encoding": "base64",
+	}
+
+	message := ""
+	for k, v := range headers {
+		message += fmt.Sprintf("%s: %s\r\n", k, v)
+	}
+	message += "\r\n" + base64.StdEncoding.EncodeToString([]byte(body))
+
+	if creds.DisableAuth {
+		return creds.sendMailSMTP(recipient, subject, message)
+	}
+	return creds.sendMailAuthSMTP(recipient, subject, message)
+}
+
+func (creds *SMTPCredentials) sendMailAuthSMTP(recipient, subject, message string) error {
+
+	auth := smtp.PlainAuth("", creds.SenderLogin, creds.SenderPassword, creds.SMTPServer)
+
+	err := smtp.SendMail(
+		fmt.Sprintf("%s:%d", creds.SMTPServer, creds.SMTPPort),
+		auth,
+		creds.SenderMail,
+		[]string{recipient},
+		[]byte(message),
+	)
+	if err != nil {
+		err = errors.Wrap(err, "smtpclient: error sending mail")
+		return err
+	}
+
+	return nil
+}
+
+func (creds *SMTPCredentials) sendMailSMTP(recipient, subject, message string) error {
+
+	c, err := smtp.Dial(fmt.Sprintf("%s:%d", creds.SMTPServer, creds.SMTPPort))
+	if err != nil {
+		return err
+	}
+	defer c.Close()
+
+	if err = c.Hello(creds.LocalName); err != nil {
+		return err
+	}
+	if err = c.Mail(creds.SenderMail); err != nil {
+		return err
+	}
+	if err = c.Rcpt(recipient); err != nil {
+		return err
+	}
+
+	wc, err := c.Data()
+	if err != nil {
+		return err
+	}
+	defer wc.Close()
+
+	buf := bytes.NewBufferString(message)
+	if _, err = buf.WriteTo(wc); err != nil {
+		return err
+	}
+
+	return nil
+}