codegirl007
f61b4fc7ab
Require email at registration (editable on profile), add a Resend mailer with idempotent first-answer sends, and keep answer saves independent of delivery.
109 lines
2.8 KiB
Go
109 lines
2.8 KiB
Go
package mail
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import (
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"context"
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"fmt"
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"html"
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"os"
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"strings"
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"github.com/resend/resend-go/v3"
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)
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// QuestionAnswered is the payload for notifying a question author of a reply.
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type QuestionAnswered struct {
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ToEmail string
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ToName string
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QuestionID string
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QuestionTitle string
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AnswerBody string
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}
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// Notifier sends transactional email about answered questions.
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type Notifier interface {
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NotifyQuestionAnswered(ctx context.Context, msg QuestionAnswered) error
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}
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// Nop is a no-op Notifier used when Resend is not configured.
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type Nop struct{}
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func (Nop) NotifyQuestionAnswered(context.Context, QuestionAnswered) error { return nil }
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// Resend sends via the Resend HTTP API.
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type Resend struct {
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client *resend.Client
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from string
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baseURL string
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}
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// FromEnv builds a Notifier from RESEND_* and APP_BASE_URL.
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// Returns Nop when RESEND_API_KEY is unset.
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func FromEnv() (Notifier, error) {
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key := strings.TrimSpace(os.Getenv("RESEND_API_KEY"))
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if key == "" {
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return Nop{}, nil
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}
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from := strings.TrimSpace(os.Getenv("RESEND_FROM"))
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base := strings.TrimRight(strings.TrimSpace(os.Getenv("APP_BASE_URL")), "/")
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if from == "" {
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return nil, fmt.Errorf("RESEND_FROM is required when RESEND_API_KEY is set")
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}
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if base == "" {
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return nil, fmt.Errorf("APP_BASE_URL is required when RESEND_API_KEY is set")
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}
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return &Resend{
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client: resend.NewClient(key),
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from: from,
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baseURL: base,
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}, nil
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}
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func (r *Resend) NotifyQuestionAnswered(ctx context.Context, msg QuestionAnswered) error {
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if r == nil || r.client == nil {
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return nil
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}
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to := strings.TrimSpace(msg.ToEmail)
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if to == "" {
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return nil
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}
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link := r.baseURL + "/questions/" + msg.QuestionID
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title := strings.TrimSpace(msg.QuestionTitle)
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if title == "" {
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title = "your question"
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}
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text := fmt.Sprintf(
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"Hi%s,\n\nYour question %q has an answer from a plumber:\n\n%s\n\nView it here:\n%s\n",
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greetingName(msg.ToName),
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title,
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msg.AnswerBody,
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link,
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)
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htmlBody := fmt.Sprintf(
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`<p>Hi%s,</p><p>Your question <strong>%s</strong> has an answer from a plumber:</p><blockquote style="margin:1em 0;padding:0.75em 1em;border-left:3px solid #ccc;white-space:pre-wrap">%s</blockquote><p><a href="%s">View the answer</a></p>`,
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html.EscapeString(greetingName(msg.ToName)),
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html.EscapeString(title),
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html.EscapeString(msg.AnswerBody),
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html.EscapeString(link),
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)
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params := &resend.SendEmailRequest{
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From: r.from,
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To: []string{to},
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Subject: "Your question was answered",
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Text: text,
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Html: htmlBody,
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}
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opts := &resend.SendEmailOptions{
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IdempotencyKey: "answer-notify:" + msg.QuestionID,
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}
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_, err := r.client.Emails.SendWithOptions(ctx, params, opts)
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return err
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}
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func greetingName(name string) string {
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name = strings.TrimSpace(name)
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if name == "" {
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return ""
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}
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return " " + name
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}
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