Add email service for sending emails

.gitignore

@@ -1,2 +1,3 @@
 tmp
+*.env
 

go.mod

@@ -11,6 +11,7 @@ require (
 )
 
 require (
+	github.com/go-mail/mail/v2 v2.3.0 // indirect
 	github.com/gorilla/securecookie v1.1.2 // indirect
 	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
 	github.com/jackc/pgconn v1.14.3 // indirect
@@ -24,4 +25,5 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
 	golang.org/x/text v0.17.0 // indirect
+	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 )

go.sum

@@ -15,6 +15,8 @@ github.com/go-chi/chi/v5 v5.1.0 h1:acVI1TYaD+hhedDJ3r54HyA6sExp3HfXq7QWEEY/xMw=
 github.com/go-chi/chi/v5 v5.1.0/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
+github.com/go-mail/mail/v2 v2.3.0 h1:wha99yf2v3cpUzD1V9ujP404Jbw2uEvs+rBJybkdYcw=
+github.com/go-mail/mail/v2 v2.3.0/go.mod h1:oE2UK8qebZAjjV1ZYUpY7FPnbi/kIU53l1dmqPRb4go=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gofrs/uuid v4.0.0+incompatible h1:1SD/1F5pU8p29ybwgQSwpQk+mwdRrXCYuPhW6m+TnJw=
 github.com/gofrs/uuid v4.0.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
@@ -203,6 +205,8 @@ golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=

models/email.go

@@ -0,0 +1,56 @@
+package models
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/go-mail/mail/v2"
+)
+
+var (
+	defaultSender = os.Getenv("LENSLOCKED_EMAIL_FROM")
+)
+
+type Email struct {
+	To      string
+	Subject string
+	Text    string
+	Html    string
+}
+
+type EmailService struct {
+	DefaultSender string
+
+	dialer *mail.Dialer
+}
+
+func NewEmailService(host string, port int, username, pass, sender string) *EmailService {
+	es := EmailService{
+		dialer:        mail.NewDialer(host, port, username, pass),
+		DefaultSender: sender,
+	}
+	return &es
+}
+
+func (es *EmailService) Send(email Email) error {
+	msg := mail.NewMessage()
+
+	msg.SetHeader("To", email.To)
+	msg.SetHeader("From", es.DefaultSender)
+	msg.SetHeader("Subject", email.Subject)
+
+	if email.Html != "" && email.Text != "" {
+		msg.SetBody("text/plain", email.Text)
+		msg.AddAlternative("text/html", email.Html)
+	} else if email.Text != "" {
+		msg.SetBody("text/plain", email.Text)
+	} else if email.Html != "" {
+		msg.SetBody("text/html", email.Html)
+	}
+
+	err := es.dialer.DialAndSend(msg)
+	if err != nil {
+		return fmt.Errorf("send: %w", err)
+	}
+	return nil
+}