71 lines
2.0 KiB
Go
71 lines
2.0 KiB
Go
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package email
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import (
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"strings"
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)
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func newUnsubscribeToken() (string, error) {
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b := make([]byte, 32)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(b), nil
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}
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func UnsubscribeURL(publicAPIURL, token string) string {
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base := strings.TrimRight(strings.TrimSpace(publicAPIURL), "/")
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if base == "" {
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base = "http://localhost:8080"
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}
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return fmt.Sprintf("%s/api/public/unsubscribe?token=%s", base, token)
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}
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func UnsubscribePageURL(webOrigin, token string) string {
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base := strings.TrimRight(strings.TrimSpace(webOrigin), "/")
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if base == "" {
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base = "http://localhost:5174"
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}
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return fmt.Sprintf("%s/unsubscribe?token=%s", base, token)
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}
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func listUnsubscribeHeaders(oneClickURL, mailtoFallback string) map[string]string {
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h := map[string]string{
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"List-Unsubscribe-Post": "List-Unsubscribe=One-Click",
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}
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parts := make([]string, 0, 2)
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if oneClickURL != "" {
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parts = append(parts, "<"+oneClickURL+">")
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}
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if mailtoFallback != "" {
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parts = append(parts, "<mailto:"+mailtoFallback+">")
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}
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if len(parts) > 0 {
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h["List-Unsubscribe"] = strings.Join(parts, ", ")
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}
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return h
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}
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func injectUnsubscribeFooter(html, text, pageURL string) (string, string) {
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link := strings.TrimSpace(pageURL)
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if link == "" {
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return html, text
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}
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footerHTML := fmt.Sprintf(
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`<hr style="border:none;border-top:1px solid #e5e7eb;margin:24px 0"/><p style="font-size:12px;color:#6b7280">You received this email because you opted in to marketing from this store. <a href="%s">Unsubscribe</a>.</p>`,
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link,
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)
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footerText := fmt.Sprintf("\n\n---\nUnsubscribe: %s\n", link)
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if strings.TrimSpace(html) != "" && !strings.Contains(strings.ToLower(html), "unsubscribe") {
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html = html + footerHTML
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}
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if strings.TrimSpace(text) != "" && !strings.Contains(strings.ToLower(text), "unsubscribe") {
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text = text + footerText
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} else if strings.TrimSpace(text) == "" && strings.TrimSpace(html) != "" {
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text = "Unsubscribe: " + link
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}
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return html, text
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}
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