mirror of
https://github.com/dnote/dnote
synced 2026-03-15 06:55:49 +01:00
133 lines
3.8 KiB
Go
133 lines
3.8 KiB
Go
/* Copyright 2025 Dnote Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Package mailer provides a functionality to send emails
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package mailer
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import (
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"bytes"
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"fmt"
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"io"
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ttemplate "text/template"
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"github.com/dnote/dnote/pkg/server/mailer/templates"
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"github.com/pkg/errors"
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)
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var (
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// EmailTypeResetPassword represents a reset password email
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EmailTypeResetPassword = "reset_password"
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// EmailTypeResetPasswordAlert represents a password change notification email
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EmailTypeResetPasswordAlert = "reset_password_alert"
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// EmailTypeWelcome represents an welcome email
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EmailTypeWelcome = "welcome"
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)
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var (
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// EmailKindText is the type of text email
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EmailKindText = "text/plain"
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)
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// tmpl is the common interface shared between Template from
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// html/template and text/template
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type tmpl interface {
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Execute(wr io.Writer, data interface{}) error
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}
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// template wraps a template with its subject line
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type template struct {
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tmpl tmpl
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subject string
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}
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// Templates holds the parsed email templates with their subjects
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type Templates map[string]template
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func getTemplateKey(name, kind string) string {
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return fmt.Sprintf("%s.%s", name, kind)
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}
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func (tmpl Templates) get(name, kind string) (template, error) {
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key := getTemplateKey(name, kind)
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t := tmpl[key]
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if t.tmpl == nil {
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return template{}, errors.Errorf("unsupported template '%s' with type '%s'", name, kind)
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}
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return t, nil
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}
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func (tmpl Templates) set(name, kind string, t tmpl, subject string) {
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key := getTemplateKey(name, kind)
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tmpl[key] = template{
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tmpl: t,
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subject: subject,
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}
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}
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// NewTemplates initializes templates
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func NewTemplates() Templates {
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welcomeText, err := initTextTmpl(EmailTypeWelcome)
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if err != nil {
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panic(errors.Wrap(err, "initializing welcome template"))
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}
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passwordResetText, err := initTextTmpl(EmailTypeResetPassword)
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if err != nil {
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panic(errors.Wrap(err, "initializing password reset template"))
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}
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passwordResetAlertText, err := initTextTmpl(EmailTypeResetPasswordAlert)
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if err != nil {
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panic(errors.Wrap(err, "initializing password reset template"))
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}
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T := Templates{}
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T.set(EmailTypeResetPassword, EmailKindText, passwordResetText, "Reset your Dnote password")
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T.set(EmailTypeResetPasswordAlert, EmailKindText, passwordResetAlertText, "Your Dnote password was changed")
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T.set(EmailTypeWelcome, EmailKindText, welcomeText, "Welcome to Dnote!")
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return T
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}
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// initTextTmpl returns a template instance by parsing the template with the given name
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func initTextTmpl(templateName string) (tmpl, error) {
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filename := fmt.Sprintf("%s.txt", templateName)
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content, err := templates.Files.ReadFile(filename)
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if err != nil {
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return nil, errors.Wrap(err, "reading template")
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}
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t := ttemplate.New(templateName)
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if _, err = t.Parse(string(content)); err != nil {
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return nil, errors.Wrap(err, "parsing template")
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}
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return t, nil
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}
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// Execute executes the template and returns the subject, body, and any error
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func (tmpl Templates) Execute(name, kind string, data any) (subject, body string, err error) {
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t, err := tmpl.get(name, kind)
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if err != nil {
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return "", "", errors.Wrap(err, "getting template")
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}
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buf := new(bytes.Buffer)
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if err := t.tmpl.Execute(buf, data); err != nil {
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return "", "", errors.Wrap(err, "executing the template")
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}
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return t.subject, buf.String(), nil
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}
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