142 lines
3.4 KiB
Go
142 lines
3.4 KiB
Go
package services
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import (
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"errors"
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"fmt"
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"github.com/labstack/echo/v4"
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"git.grosinger.net/tgrosinger/saasitone/config"
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"git.grosinger.net/tgrosinger/saasitone/pkg/log"
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)
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type (
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// MailClient provides a client for sending email
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// This is purposely not completed because there are many different methods and services
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// for sending email, many of which are very different. Choose what works best for you
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// and populate the methods below
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MailClient struct {
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// config stores application configuration
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config *config.Config
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// templates stores the template renderer
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templates *TemplateRenderer
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}
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// mail represents an email to be sent
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mail struct {
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client *MailClient
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from string
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to string
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subject string
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body string
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template string
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templateData any
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}
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)
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// NewMailClient creates a new MailClient
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func NewMailClient(cfg *config.Config, templates *TemplateRenderer) (*MailClient, error) {
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return &MailClient{
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config: cfg,
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templates: templates,
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}, nil
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}
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// Compose creates a new email
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func (m *MailClient) Compose() *mail {
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return &mail{
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client: m,
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from: m.config.Mail.FromAddress,
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}
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}
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// skipSend determines if mail sending should be skipped
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func (m *MailClient) skipSend() bool {
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return m.config.App.Environment != config.EnvProduction
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}
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// send attempts to send the email
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func (m *MailClient) send(email *mail, ctx echo.Context) error {
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switch {
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case email.to == "":
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return errors.New("email cannot be sent without a to address")
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case email.body == "" && email.template == "":
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return errors.New("email cannot be sent without a body or template")
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}
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// Check if a template was supplied
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if email.template != "" {
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// Parse and execute template
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buf, err := m.templates.
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Parse().
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Group("mail").
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Key(email.template).
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Base(email.template).
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Files(fmt.Sprintf("emails/%s", email.template)).
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Execute(email.templateData)
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if err != nil {
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return err
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}
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email.body = buf.String()
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}
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// Check if mail sending should be skipped
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if m.skipSend() {
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log.Ctx(ctx).Debug("skipping email delivery",
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"to", email.to,
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)
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return nil
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}
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// TODO: Finish based on your mail sender of choice!
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return nil
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}
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// From sets the email from address
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func (m *mail) From(from string) *mail {
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m.from = from
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return m
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}
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// To sets the email address this email will be sent to
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func (m *mail) To(to string) *mail {
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m.to = to
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return m
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}
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// Subject sets the subject line of the email
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func (m *mail) Subject(subject string) *mail {
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m.subject = subject
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return m
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}
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// Body sets the body of the email
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// This is not required and will be ignored if a template via Template()
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func (m *mail) Body(body string) *mail {
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m.body = body
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return m
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}
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// Template sets the template to be used to produce the body of the email
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// The template name should only include the filename without the extension or directory.
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// The template must reside within the emails sub-directory.
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// The funcmap will be automatically added to the template.
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// Use TemplateData() to supply the data that will be passed in to the template.
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func (m *mail) Template(template string) *mail {
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m.template = template
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return m
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}
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// TemplateData sets the data that will be passed to the template specified when calling Template()
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func (m *mail) TemplateData(data any) *mail {
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m.templateData = data
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return m
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}
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// Send attempts to send the email
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func (m *mail) Send(ctx echo.Context) error {
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return m.client.send(m, ctx)
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}
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