codegirl007
3dde9f79f4
CI / test (pull_request) Successful in 6m23s
Notify direct parent authors throughout threaded conversations while skipping self-replies, edits, and recipients without email.
206 lines
7.5 KiB
Go
206 lines
7.5 KiB
Go
package mail
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import (
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"context"
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_ "embed"
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"fmt"
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"html"
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"net/url"
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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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//go:embed mark.png
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var markPNG []byte
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// PostReply is the payload for notifying a post author of a direct reply.
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type PostReply struct {
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ToEmail string
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ToName string
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RootID string
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RootTitle string
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ReplyID string
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ReplyBody string
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ReplyAuthorName string
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}
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// Notifier sends transactional email about post replies.
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type Notifier interface {
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NotifyPostReply(ctx context.Context, msg PostReply) 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) NotifyPostReply(context.Context, PostReply) 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) NotifyPostReply(ctx context.Context, msg PostReply) 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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text, htmlBody := postReplyContent(r.baseURL, msg)
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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: "New reply to your post",
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Text: text,
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Html: htmlBody,
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Attachments: []*resend.Attachment{{
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Content: markPNG,
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Filename: "ask-a-plumber-first.png",
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ContentType: "image/png",
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ContentId: "reply-notification-mark",
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}},
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}
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opts := &resend.SendEmailOptions{
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IdempotencyKey: "post-reply:" + msg.ReplyID,
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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 postReplyContent(baseURL string, msg PostReply) (string, string) {
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link := strings.TrimRight(baseURL, "/") +
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"/questions/" + url.PathEscape(msg.RootID) +
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"#post-" + url.PathEscape(msg.ReplyID)
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title := replyRootTitle(msg.RootTitle)
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author := strings.TrimSpace(msg.ReplyAuthorName)
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if author == "" {
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author = "Someone"
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}
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text := fmt.Sprintf(
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"Hi%s,\n\n%s replied in %q:\n\n%s\n\nView the reply:\n%s\n",
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greetingName(msg.ToName),
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author,
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title,
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msg.ReplyBody,
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link,
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)
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htmlBody := strings.NewReplacer(
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"{{PREHEADER}}", html.EscapeString(author+" replied in "+title+"."),
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"{{GREETING}}", html.EscapeString(greetingName(msg.ToName)),
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"{{TITLE}}", html.EscapeString(title),
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"{{AUTHOR}}", html.EscapeString(author),
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"{{REPLY}}", html.EscapeString(msg.ReplyBody),
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"{{LINK}}", html.EscapeString(link),
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"{{MARK}}", "cid:reply-notification-mark",
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).Replace(postReplyHTML)
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return text, htmlBody
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}
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func replyRootTitle(title string) string {
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title = strings.TrimSpace(title)
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if title == "" {
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return "your conversation"
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}
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return title
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}
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const postReplyHTML = `<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="color-scheme" content="dark">
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<meta name="supported-color-schemes" content="dark">
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<title>New reply to your conversation</title>
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</head>
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<body style="margin:0;padding:0;background:#161719;color:#ecebe7;font-family:Arial,'Helvetica Neue',sans-serif;">
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<div style="display:none;max-height:0;overflow:hidden;opacity:0;color:transparent;">{{PREHEADER}}</div>
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<table role="presentation" width="100%" cellspacing="0" cellpadding="0" border="0" style="width:100%;background:#161719;">
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<tr>
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<td align="center" style="padding:32px 16px;">
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<table role="presentation" width="560" cellspacing="0" cellpadding="0" border="0" style="width:100%;max-width:560px;background:#1e2023;border:1px solid #2e3136;border-top:3px solid #e96a26;border-radius:3px;">
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<tr>
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<td style="padding:24px 28px 20px;border-bottom:1px solid #2e3136;">
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<table role="presentation" cellspacing="0" cellpadding="0" border="0">
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<tr>
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<td style="padding-right:12px;vertical-align:middle;">
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<img src="{{MARK}}" width="32" height="32" alt="" style="display:block;width:32px;height:32px;border:0;">
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</td>
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<td style="vertical-align:middle;">
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<div style="color:#ecebe7;font-size:14px;font-weight:700;line-height:1.2;letter-spacing:1px;text-transform:uppercase;">Ask a Plumber First</div>
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<div style="margin-top:4px;color:#8d9096;font-family:'Courier New',monospace;font-size:10px;line-height:1.2;letter-spacing:1.4px;text-transform:uppercase;">Bay Area · Shop Dispatch</div>
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</td>
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</tr>
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</table>
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</td>
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</tr>
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<tr>
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<td style="padding:30px 28px 32px;">
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<div style="margin:0 0 10px;color:#e96a26;font-family:'Courier New',monospace;font-size:11px;font-weight:700;line-height:1.4;letter-spacing:1.8px;text-transform:uppercase;">New reply</div>
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<h1 style="margin:0;color:#ecebe7;font-size:28px;font-weight:600;line-height:1.2;letter-spacing:-0.4px;">The conversation has a new reply.</h1>
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<p style="margin:18px 0 0;color:#b8babf;font-size:16px;line-height:1.6;">Hi{{GREETING}}, {{AUTHOR}} replied in:</p>
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<p style="margin:8px 0 0;color:#ecebe7;font-size:17px;font-weight:600;line-height:1.45;">“{{TITLE}}”</p>
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<table role="presentation" width="100%" cellspacing="0" cellpadding="0" border="0" style="width:100%;margin-top:24px;background:#161719;border:1px solid #2e3136;border-radius:3px;">
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<tr>
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<td style="padding:20px 18px;">
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<div style="margin:0 0 10px;color:#8d9096;font-family:'Courier New',monospace;font-size:10px;font-weight:700;line-height:1.4;letter-spacing:1.5px;text-transform:uppercase;">The reply</div>
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<div style="margin:0;color:#ecebe7;font-size:16px;line-height:1.65;white-space:pre-wrap;">{{REPLY}}</div>
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</td>
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</tr>
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</table>
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<table role="presentation" cellspacing="0" cellpadding="0" border="0" style="margin-top:26px;">
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<tr>
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<td bgcolor="#e96a26" style="border-radius:3px;">
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<a href="{{LINK}}" style="display:inline-block;padding:13px 18px;color:#161719;font-family:'Courier New',monospace;font-size:12px;font-weight:700;line-height:1;text-decoration:none;letter-spacing:0.8px;text-transform:uppercase;">View the reply →</a>
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</td>
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</tr>
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</table>
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</td>
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</tr>
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<tr>
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<td style="padding:18px 28px;border-top:1px solid #2e3136;color:#8d9096;font-family:'Courier New',monospace;font-size:10px;line-height:1.6;letter-spacing:0.4px;">
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You received this because someone replied to your post on Ask a Plumber First.
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</td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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</body>
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</html>`
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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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