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Add draft link to newsletter notification email #36

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Merged
deepakjois merged 1 commit into from
Dec 29, 2025
Merged

Add draft link to newsletter notification email #36

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42 changes: 29 additions & 13 deletions build_newsletter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,10 @@ type ButtondownPayload struct {
Status string `json:"status"`
}

type ButtondownResponse struct {
ID string `json:"id"`
}

// calculateNewsletterWeek computes the newsletter week information for a given time.
// The newsletter covers Sunday to Saturday of the previous week.
// The week number is based on the Monday of that week (ISO week standard).
Expand Down Expand Up @@ -89,12 +93,14 @@ func (cmd *BuildNewsletterCmd) Run() error {

if cmd.Post {
fmt.Fprintf(os.Stderr, "posting weekly digest for Week %d, %d (%s to %s) to Buttondown\n", week.WeekNum, week.Year, week.Start.Format("2006-01-02"), week.End.Format("2006-01-02"))
if err := postToButtondown(content, week.Year, week.WeekNum); err != nil {
draftURL, err := postToButtondown(content, week.Year, week.WeekNum)
if err != nil {
return fmt.Errorf("failed to post to ButtonDown: %w", err)
}
fmt.Fprintf(os.Stderr, "draft created: %s\n", draftURL)

if cmd.Notify {
if err := sendNotificationEmail(week.Year, week.WeekNum); err != nil {
if err := sendNotificationEmail(week.Year, week.WeekNum, draftURL); err != nil {
return fmt.Errorf("failed to send notification email: %w", err)
}
}
Expand All @@ -105,7 +111,7 @@ func (cmd *BuildNewsletterCmd) Run() error {
return nil
}

func postToButtondown(content string, year, weekNum int) error {
func postToButtondown(content string, year, weekNum int) (string, error) {
payload := ButtondownPayload{
Subject: fmt.Sprintf("Daily Log Digest – Week %d, %d", weekNum, year),
Body: "<!-- buttondown-editor-mode: plaintext -->\n" + content, // See: https://github.com/buttondown/discussions/discussions/59#discussioncomment-12251332
Expand All @@ -114,17 +120,17 @@ func postToButtondown(content string, year, weekNum int) error {

var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(payload); err != nil {
return fmt.Errorf("failed to encode JSON payload: %w", err)
return "", fmt.Errorf("failed to encode JSON payload: %w", err)
}

apiKey := os.Getenv("BUTTONDOWN_API_KEY")
if apiKey == "" {
return fmt.Errorf("BUTTONDOWN_API_KEY environment variable not set")
return "", fmt.Errorf("BUTTONDOWN_API_KEY environment variable not set")
}

req, err := http.NewRequest("POST", "https://api.buttondown.com/v1/emails", &buf)
if err != nil {
return fmt.Errorf("failed to create HTTP request: %w", err)
return "", fmt.Errorf("failed to create HTTP request: %w", err)
}

req.Header.Set("Authorization", "Token "+apiKey)
Expand All @@ -133,16 +139,26 @@ func postToButtondown(content string, year, weekNum int) error {
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("failed to execute HTTP request: %w", err)
return "", fmt.Errorf("failed to execute HTTP request: %w", err)
}
defer resp.Body.Close()

body, err := io.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("failed to read response body: %w", err)
}

if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
body, _ := io.ReadAll(resp.Body)
return fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, body)
return "", fmt.Errorf("API request failed with status %d: %s", resp.StatusCode, body)
}

return nil
var response ButtondownResponse
if err := json.Unmarshal(body, &response); err != nil {
return "", fmt.Errorf("failed to parse API response: %w", err)
}

draftURL := fmt.Sprintf("https://buttondown.com/emails/%s", response.ID)
return draftURL, nil
}

func collectFiles(start, end AppTimezone) ([]string, error) {
Expand Down Expand Up @@ -202,7 +218,7 @@ func transformMarkdown(content string) string {
}

// sendNotificationEmail sends a notification email using Resend API after the newsletter has been posted
func sendNotificationEmail(year, weekNum int) error {
func sendNotificationEmail(year, weekNum int, draftURL string) error {
apiKey := os.Getenv("RESEND_API_KEY")
if apiKey == "" {
return fmt.Errorf("RESEND_API_KEY environment variable not set")
Expand All @@ -211,10 +227,10 @@ func sendNotificationEmail(year, weekNum int) error {
client := resend.NewClient(apiKey)

params := &resend.SendEmailRequest{
From: "hi@notifications.debugjois.dev",
From: "debugjois.dev NewsletterBot <hi@notifications.debugjois.dev>",
To: []string{"deepak.jois@gmail.com"},
Subject: fmt.Sprintf("Newsletter posted - Week %d, %d", weekNum, year),
Html: fmt.Sprintf("Your weekly newsletter for Week %d, %d has been posted to Buttondown.", weekNum, year),
Html: fmt.Sprintf("Your weekly newsletter for Week %d, %d has been posted to Buttondown.<br><br>Edit draft: <a href=\"%s\">%s</a>", weekNum, year, draftURL, draftURL),
}

_, err := client.Emails.Send(params)
Expand Down