everywhere: add email notifications

api/email_notification_new.go

@@ -0,0 +1,138 @@
+package main
+
+import ()
+
+func emailNotificationModerator(d domain, path string, title string, commenterHex string, commentHex string, state string) {
+	if d.EmailNotificationPolicy == "none" {
+		return
+	}
+
+	// We'll need to check again when we're sending in case the comment was
+	// approved midway anyway.
+	if d.EmailNotificationPolicy == "pending-moderation" && state == "approved" {
+		return
+	}
+
+	var commenterName string
+	var commenterEmail string
+	if commenterHex == "anonymous" {
+		commenterName = "Anonymous"
+	} else {
+		c, err := commenterGetByHex(commenterHex)
+		if err != nil {
+			logger.Errorf("cannot get commenter to send email notification: %v", err)
+			return
+		}
+
+		commenterName = c.Name
+		commenterEmail = c.Email
+	}
+
+	kind := d.EmailNotificationPolicy
+	if state != "approved" {
+		kind = "pending-moderation"
+	}
+
+	for _, m := range d.Moderators {
+		// Do not email the commenting moderator their own comment.
+		if commenterHex != "anonymous" && m.Email == commenterEmail {
+			continue
+		}
+
+		emailNotificationPendingIncrement(m.Email)
+		emailNotificationEnqueue(emailNotification{
+			Email:         m.Email,
+			CommenterName: commenterName,
+			Domain:        d.Domain,
+			Path:          path,
+			Title:         title,
+			CommentHex:    commentHex,
+			Kind:          kind,
+		})
+	}
+}
+
+func emailNotificationReply(d domain, path string, title string, commenterHex string, commentHex string, parentHex string, state string) {
+	// No reply notifications for root comments.
+	if parentHex == "root" {
+		return
+	}
+
+	// No reply notification emails for unapproved comments.
+	if state != "approved" {
+		return
+	}
+
+	statement := `
+		SELECT commenterHex
+		FROM comments
+		WHERE commentHex = $1;
+	`
+	row := db.QueryRow(statement, parentHex)
+
+	var parentCommenterHex string
+	err := row.Scan(&parentCommenterHex)
+	if err != nil {
+		logger.Errorf("cannot scan commenterHex and parentCommenterHex: %v", err)
+		return
+	}
+
+	// No reply notification emails for anonymous users.
+	if parentCommenterHex == "anonymous" {
+		return
+	}
+
+	// No reply notification email for self replies.
+	if parentCommenterHex == commenterHex {
+		return
+	}
+
+	pc, err := commenterGetByHex(parentCommenterHex)
+	if err != nil {
+		logger.Errorf("cannot get commenter to send email notification: %v", err)
+		return
+	}
+
+	var commenterName string
+	if commenterHex == "anonymous" {
+		commenterName = "Anonymous"
+	} else {
+		c, err := commenterGetByHex(commenterHex)
+		if err != nil {
+			logger.Errorf("cannot get commenter to send email notification: %v", err)
+			return
+		}
+		commenterName = c.Name
+	}
+
+	// We'll check if they want to receive reply notifications later at the time
+	// of sending.
+	emailNotificationEnqueue(emailNotification{
+		Email:         pc.Email,
+		CommenterName: commenterName,
+		Domain:        d.Domain,
+		Path:          path,
+		Title:         title,
+		CommentHex:    commentHex,
+		Kind:          "reply",
+	})
+}
+
+func emailNotificationNew(d domain, path string, commenterHex string, commentHex string, parentHex string, state string) {
+	p, err := pageGet(d.Domain, path)
+	if err != nil {
+		logger.Errorf("cannot get page to send email notification: %v", err)
+		return
+	}
+
+	if p.Title == "" {
+		p.Title, err = pageTitleUpdate(d.Domain, path)
+		if err != nil {
+			logger.Errorf("cannot update/get page title to send email notification: %v", err)
+			return
+		}
+	}
+
+	emailNotificationModerator(d, path, p.Title, commenterHex, commentHex, state)
+	emailNotificationReply(d, path, p.Title, commenterHex, commentHex, parentHex, state)
+}