added SendEmail

CHANGELOG.md

@@ -1,6 +1,9 @@
 # PASSWALL CHANGELOG
 
 ## Version: [1.1.-] (2020-07-**)
+### Add
+- Email configuration
+- SendEmail function to app package
 ### Changed
 - Github organization name pass-wall to passwall
 

internal/app/send_email.go

@@ -0,0 +1,47 @@
+package app
+
+import (
+	"fmt"
+	"log"
+	"net/smtp"
+
+	"github.com/spf13/viper"
+)
+
+// SendMail is an helper to send mail all over the project
+func SendMail(to []string, subject, body string) {
+
+	// Set up authentication information.
+	auth := smtp.PlainAuth(
+		"",
+		viper.GetString("email.username"),
+		viper.GetString("email.password"),
+		viper.GetString("email.host"),
+	)
+
+	header := make(map[string]string)
+	header["From"] = viper.GetString("email.from")
+	header["To"] = to[0]
+	header["Subject"] = subject
+	header["MIME-Version"] = "1.0"
+	header["Content-Type"] = "text/plain; charset=\"utf-8\""
+
+	message := ""
+	for k, v := range header {
+		message += fmt.Sprintf("%s: %s\r\n", k, v)
+	}
+	message += "\r\n" + body
+
+	// Connect to the server, authenticate, set the sender and recipient,
+	// and send the email all in one step.
+	err := smtp.SendMail(
+		viper.GetString("email.host")+":"+viper.GetString("email.port"),
+		auth,
+		viper.GetString("email.from"),
+		to,
+		[]byte(message),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+}

internal/config/config.go

@@ -51,6 +51,7 @@ type EmailConfiguration struct {
 	Username string `default:"[email protected]"`
 	Password string `default:"password"`
 	From     string `default:"[email protected]"`
+	Admin    string `default:"[email protected]"`
 }
 
 // SetupConfigDefaults ...
@@ -129,6 +130,7 @@ func bindEnvs() {
 	viper.BindEnv("email.username", "PW_EMAIL_USERNAME")
 	viper.BindEnv("email.password", "PW_EMAIL_PASSWORD")
 	viper.BindEnv("email.from", "PW_EMAIL_FROM")
+	viper.BindEnv("email.admin", "PW_EMAIL_ADMIN")
 
 	viper.BindEnv("backup.folder", "PW_BACKUP_FOLDER")
 	viper.BindEnv("backup.rotation", "PW_BACKUP_ROTATION")
@@ -160,6 +162,7 @@ func setDefaults() {
 	viper.SetDefault("email.username", "[email protected]")
 	viper.SetDefault("email.password", "password")
 	viper.SetDefault("email.from", "[email protected]")
+	viper.SetDefault("email.admin", "[email protected]")
 
 	// Backup defaults
 	viper.SetDefault("backup.folder", "./store/")