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* feat: create mailer (go-mailer is used) * fix linter * sendGrid implementation * refactor: separate smtp and sendgrid * refactor: add sender name to config * fix newWithSMTP wrong parameter * mixed email content break down MailerConfig struct * resolve notes * resolve notes testing * testing * test cases * test cases * Merge branch 'feat/authentication-system' of https://github.com/reearth/reearth-backend into auth/mailer # Conflicts: # go.mod # internal/app/config.go * Merge branch 'feat/authentication-system' of https://github.com/reearth/reearth-backend into auth/mailer # Conflicts: # go.mod * swap plain and html contents * switch to alternative * remove unused functions * validate email and smtp url
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| package mailer | ||
|
|
||
| import ( | ||
| "github.com/reearth/reearth-backend/internal/usecase/gateway" | ||
| "github.com/sendgrid/sendgrid-go" | ||
| "github.com/sendgrid/sendgrid-go/helpers/mail" | ||
| ) | ||
|
|
||
| type sendgridMailer struct { | ||
| api string | ||
| // sender data | ||
| name string | ||
| email string | ||
| } | ||
|
|
||
| func NewWithSendGrid(senderName, senderEmail, api string) gateway.Mailer { | ||
| return &sendgridMailer{ | ||
| name: senderName, | ||
| email: senderEmail, | ||
| api: api, | ||
| } | ||
| } | ||
|
|
||
| func (m *sendgridMailer) SendMail(to []gateway.Contact, subject, plainContent, htmlContent string) error { | ||
| contact := to[0] | ||
| sender := mail.NewEmail(m.name, m.email) | ||
| receiver := mail.NewEmail(contact.Name, contact.Email) | ||
| message := mail.NewSingleEmail(sender, subject, receiver, plainContent, htmlContent) | ||
| client := sendgrid.NewSendClient(m.api) | ||
| _, err := client.Send(message) | ||
| return err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package mailer | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/reearth/reearth-backend/internal/usecase/gateway" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestNewWithSendGrid(t *testing.T) { | ||
| type args struct { | ||
| senderName string | ||
| senderEmail string | ||
| api string | ||
| } | ||
| tests := []struct { | ||
| name string | ||
| args args | ||
| want gateway.Mailer | ||
| }{ | ||
| { | ||
| name: "should create a sendGrid mailer", | ||
| args: args{ | ||
| senderName: "test sender", | ||
| senderEmail: "sender@test.com", | ||
| api: "TEST_API", | ||
| }, | ||
| want: &sendgridMailer{ | ||
| api: "TEST_API", | ||
| name: "test sender", | ||
| email: "sender@test.com", | ||
| }, | ||
| }, | ||
| } | ||
| for _, tc := range tests { | ||
| t.Run(tc.name, func(tt *testing.T) { | ||
| got := NewWithSendGrid(tc.args.senderName, tc.args.senderEmail, tc.args.api) | ||
| assert.Equal(tt, tc.want, got) | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package mailer | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "mime/multipart" | ||
| "net/mail" | ||
| "net/smtp" | ||
| "net/textproto" | ||
| "strings" | ||
|
|
||
| "github.com/reearth/reearth-backend/internal/usecase/gateway" | ||
| ) | ||
|
|
||
| type smtpMailer struct { | ||
| host string | ||
| port string | ||
| username string | ||
| password string | ||
| } | ||
|
|
||
| type message struct { | ||
| to []string | ||
| subject string | ||
| plainContent string | ||
| htmlContent string | ||
| } | ||
|
|
||
| func (m *message) encodeContent() (string, error) { | ||
| buf := bytes.NewBuffer(nil) | ||
| writer := multipart.NewWriter(buf) | ||
| boundary := writer.Boundary() | ||
|
|
||
| altBuffer, err := writer.CreatePart(textproto.MIMEHeader{"Content-Type": {"multipart/alternative; boundary=" + boundary}}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| altWriter := multipart.NewWriter(altBuffer) | ||
| err = altWriter.SetBoundary(boundary) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| var content io.Writer | ||
| content, err = altWriter.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/plain"}}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| _, err = content.Write([]byte(m.plainContent + "\r\n\r\n")) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| content, err = altWriter.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/html"}}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| _, err = content.Write([]byte(m.htmlContent + "\r\n")) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| _ = altWriter.Close() | ||
| return buf.String(), nil | ||
| } | ||
|
|
||
| func (m *message) encodeMessage() ([]byte, error) { | ||
| buf := bytes.NewBuffer(nil) | ||
| buf.WriteString(fmt.Sprintf("Subject: %s\n", m.subject)) | ||
| buf.WriteString(fmt.Sprintf("To: %s\n", strings.Join(m.to, ","))) | ||
| content, err := m.encodeContent() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| buf.WriteString(content) | ||
|
|
||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| func NewWithSMTP(host, port, username, password string) gateway.Mailer { | ||
| return &smtpMailer{ | ||
| host: host, | ||
| port: port, | ||
| username: username, | ||
| password: password, | ||
| } | ||
| } | ||
|
|
||
| func (m *smtpMailer) SendMail(to []gateway.Contact, subject, plainContent, htmlContent string) error { | ||
| emails := make([]string, 0, len(to)) | ||
| for _, c := range to { | ||
| _, err := mail.ParseAddress(c.Email) | ||
| if err != nil { | ||
| return fmt.Errorf("invalid email %s", c.Email) | ||
| } | ||
| emails = append(emails, c.Email) | ||
| } | ||
|
|
||
| msg := &message{ | ||
| to: emails, | ||
| subject: subject, | ||
| plainContent: plainContent, | ||
| htmlContent: htmlContent, | ||
| } | ||
|
|
||
| encodedMsg, err := msg.encodeMessage() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| auth := smtp.PlainAuth("", m.username, m.password, m.host) | ||
| if len(m.host) == 0 { | ||
| return errors.New("invalid smtp url") | ||
| } | ||
| return smtp.SendMail(m.host+":"+m.port, auth, m.username, emails, encodedMsg) | ||
| } |
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