Add support for subscribing to comment threads

core/admin.go

@@ -38,25 +38,40 @@ func (b *Blog) SettingsHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method == http.MethodPost {
 		redisPort, _ := strconv.Atoi(r.FormValue("redis-port"))
 		redisDB, _ := strconv.Atoi(r.FormValue("redis-db"))
+		mailPort, _ := strconv.Atoi(r.FormValue("mail-port"))
 		form := &forms.Settings{
 			Title:        r.FormValue("title"),
 			AdminEmail:   r.FormValue("admin-email"),
+			URL:          r.FormValue("url"),
 			RedisEnabled: r.FormValue("redis-enabled") == "true",
 			RedisHost:    r.FormValue("redis-host"),
 			RedisPort:    redisPort,
 			RedisDB:      redisDB,
 			RedisPrefix:  r.FormValue("redis-prefix"),
+			MailEnabled:  r.FormValue("mail-enabled") == "true",
+			MailSender:   r.FormValue("mail-sender"),
+			MailHost:     r.FormValue("mail-host"),
+			MailPort:     mailPort,
+			MailUsername: r.FormValue("mail-username"),
+			MailPassword: r.FormValue("mail-password"),
 		}
 
 		// Copy form values into the settings struct for display, in case of
 		// any validation errors.
 		settings.Site.Title = form.Title
 		settings.Site.AdminEmail = form.AdminEmail
+		settings.Site.URL = form.URL
 		settings.Redis.Enabled = form.RedisEnabled
 		settings.Redis.Host = form.RedisHost
 		settings.Redis.Port = form.RedisPort
 		settings.Redis.DB = form.RedisDB
 		settings.Redis.Prefix = form.RedisPrefix
+		settings.Mail.Enabled = form.MailEnabled
+		settings.Mail.Sender = form.MailSender
+		settings.Mail.Host = form.MailHost
+		settings.Mail.Port = form.MailPort
+		settings.Mail.Username = form.MailUsername
+		settings.Mail.Password = form.MailPassword
 		err := form.Validate()
 		if err != nil {
 			v.Error = err

core/blog.go

@@ -3,6 +3,7 @@ package core
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"html/template"
 	"net/http"
 	"sort"
@@ -11,6 +12,7 @@ import (
 	"time"
 
 	"github.com/gorilla/mux"
+	"github.com/kirsle/blog/core/models/comments"
 	"github.com/kirsle/blog/core/models/posts"
 	"github.com/kirsle/blog/core/models/users"
 	"github.com/urfave/negroni"
@@ -21,6 +23,7 @@ type PostMeta struct {
 	Post        *posts.Post
 	Rendered    template.HTML
 	Author      *users.User
+	NumComments int
 	IndexView   bool
 	Snipped     bool
 }
@@ -201,10 +204,17 @@ func (b *Blog) PartialIndex(w http.ResponseWriter, r *http.Request,
 			author = users.DeletedUser()
 		}
 
+		// Count the comments on this post.
+		var numComments int
+		if thread, err := comments.Load(fmt.Sprintf("post-%d", post.ID)); err == nil {
+			numComments = len(thread.Comments)
+		}
+
 		view = append(view, PostMeta{
 			Post:        post,
 			Rendered:    rendered,
 			Author:      author,
+			NumComments: numComments,
 		})
 	}
 
@@ -286,7 +296,7 @@ func (b *Blog) viewPost(w http.ResponseWriter, r *http.Request, fragment string)
 // RenderPost renders a blog post as a partial template and returns the HTML.
 // If indexView is true, the blog headers will be hyperlinked to the dedicated
 // entry view page.
-func (b *Blog) RenderPost(p *posts.Post, indexView bool) template.HTML {
+func (b *Blog) RenderPost(p *posts.Post, indexView bool, numComments int) template.HTML {
 	// Look up the author's information.
 	author, err := users.LoadReadonly(p.AuthorID)
 	if err != nil {
@@ -332,6 +342,7 @@ func (b *Blog) RenderPost(p *posts.Post, indexView bool) template.HTML {
 		Author:      author,
 		IndexView:   indexView,
 		Snipped:     snipped,
+		NumComments: numComments,
 	}
 	output := bytes.Buffer{}
 	err = t.Execute(&output, meta)

core/comments.go

@@ -2,9 +2,10 @@ package core
 
 import (
 	"bytes"
-	"fmt"
+	"errors"
 	"html/template"
 	"net/http"
+	"net/mail"
 	"strings"
 
 	"github.com/google/uuid"
@@ -17,24 +18,19 @@ import (
 // CommentRoutes attaches the comment routes to the app.
 func (b *Blog) CommentRoutes(r *mux.Router) {
 	r.HandleFunc("/comments", b.CommentHandler)
-	r.HandleFunc("/comments/edit", b.EditCommentHandler)
+	r.HandleFunc("/comments/subscription", b.SubscriptionHandler)
-	r.HandleFunc("/comments/delete", b.DeleteCommentHandler)
+	r.HandleFunc("/comments/quick-delete", b.QuickDeleteHandler)
 }
 
 // CommentMeta is the template variables for comment threads.
 type CommentMeta struct {
-	IsAuthenticated bool
+	NewComment comments.Comment
 	ID         string
 	OriginURL  string // URL where original comment thread appeared
 	Subject    string // email subject
 	Thread     *comments.Thread
 	Authors    map[int]*users.User
 	CSRF       string
-
-	// Cached name and email of the user.
-	Name      string
-	Email     string
-	EditToken string
 }
 
 // RenderComments renders a comment form partial and returns the HTML.
@@ -73,12 +69,9 @@ func (b *Blog) RenderComments(session *sessions.Session, csrfToken, url, subject
 
 		// Look up the author username.
 		if c.UserID > 0 {
-			log.Warn("Has USERID %d", c.UserID)
 			if _, ok := userMap[c.UserID]; !ok {
-				log.Warn("not in map")
 				if user, err := users.Load(c.UserID); err == nil {
 					userMap[c.UserID] = user
-					log.Warn("is now!")
 				}
 			}
 
@@ -94,8 +87,6 @@ func (b *Blog) RenderComments(session *sessions.Session, csrfToken, url, subject
 		if isAdmin || (len(c.EditToken) > 0 && c.EditToken == editToken) {
 			c.Editable = true
 		}
-
-		fmt.Printf("%v\n", c)
 	}
 
 	// Get the template snippet.
@@ -125,17 +116,17 @@ func (b *Blog) RenderComments(session *sessions.Session, csrfToken, url, subject
 		Subject:   subject,
 		CSRF:      csrfToken,
 		Thread:    &thread,
-		IsAuthenticated: isAuthenticated,
+		NewComment: comments.Comment{
 			Name:            name,
 			Email:           email,
-		EditToken:       editToken,
+			IsAuthenticated: isAuthenticated,
+		},
 	}
 
 	output := bytes.Buffer{}
 	err = t.Execute(&output, v)
 	if err != nil {
-		log.Error(err.Error())
+		return template.HTML(err.Error())
-		return template.HTML("[error executing template in comments/comments.partial]")
 	}
 
 	return template.HTML(output.String())
@@ -228,8 +219,24 @@ func (b *Blog) CommentHandler(w http.ResponseWriter, r *http.Request) {
 				c.UserID = currentUser.ID
 			}
 
+			// Append their comment.
 			t.Post(c)
+			b.NotifyComment(c)
+
+			// Are they subscribing to future comments?
+			if c.Subscribe && len(c.Email) > 0 {
+				if _, err := mail.ParseAddress(c.Email); err == nil {
+					m := comments.LoadMailingList()
+					m.Subscribe(t.ID, c.Email)
+					b.FlashAndRedirect(w, r, c.OriginURL,
+						"Comment posted, and you've been subscribed to "+
+							"future comments on this page.",
+					)
+					return
+				}
+			}
 			b.FlashAndRedirect(w, r, c.OriginURL, "Comment posted!")
+			return
 		}
 	}
 
@@ -241,49 +248,60 @@ func (b *Blog) CommentHandler(w http.ResponseWriter, r *http.Request) {
 	b.RenderTemplate(w, r, "comments/index.gohtml", v)
 }
 
-// EditCommentHandler for editing comments.
+// SubscriptionHandler to opt out of subscriptions.
-func (b *Blog) EditCommentHandler(w http.ResponseWriter, r *http.Request) {
+func (b *Blog) SubscriptionHandler(w http.ResponseWriter, r *http.Request) {
-	var (
-		threadID    = r.URL.Query().Get("t")
-		deleteToken = r.URL.Query().Get("d")
-		originURL   = r.URL.Query().Get("o")
-	)
-
-	// Our edit token.
-	editToken := b.GetEditToken(w, r)
-
-	// Search for the comment.
-	thread, err := comments.Load(threadID)
-	if err != nil {
-		b.FlashAndRedirect(w, r, "/", "That comment thread was not found.")
-		return
-	}
-	comment, err := thread.FindByDeleteToken(deleteToken)
-	if err != nil {
-		b.FlashAndRedirect(w, r, "/", "That comment was not found.")
-		return
-	}
-
-	// And can we edit it?
-	if comment.EditToken != editToken {
-		b.Forbidden(w, r, "Your edit token is not valid for that comment.")
-		return
-	}
-
-	comment.ThreadID = thread.ID
-	comment.OriginURL = originURL
-
 	v := NewVars()
-	v.Data["Thread"] = thread
-	v.Data["Comment"] = comment
-	v.Data["Editing"] = true
 
-	b.RenderTemplate(w, r, "comments/index.gohtml", v)
+	// POST to unsubscribe from all threads.
+	if r.Method == http.MethodPost {
+		email := r.FormValue("email")
+		if email == "" {
+			v.Error = errors.New("email address is required to unsubscribe from comment threads")
+		} else if _, err := mail.ParseAddress(email); err != nil {
+			v.Error = errors.New("invalid email address")
+		}
+
+		m := comments.LoadMailingList()
+		m.UnsubscribeAll(email)
+		b.FlashAndRedirect(w, r, "/comments/subscription",
+			"You have been unsubscribed from all mailing lists.",
+		)
+		return
+	}
+
+	// GET to unsubscribe from a single thread.
+	thread := r.URL.Query().Get("t")
+	email := r.URL.Query().Get("e")
+	if thread != "" && email != "" {
+		m := comments.LoadMailingList()
+		m.Unsubscribe(thread, email)
+		b.FlashAndRedirect(w, r, "/comments/subscription", "You have been unsubscribed successfully.")
+		return
+	}
+
+	b.RenderTemplate(w, r, "comments/subscription.gohtml", v)
 }
 
-// DeleteCommentHandler for editing comments.
+// QuickDeleteHandler allows the admin to quickly delete spam without logging in.
-func (b *Blog) DeleteCommentHandler(w http.ResponseWriter, r *http.Request) {
+func (b *Blog) QuickDeleteHandler(w http.ResponseWriter, r *http.Request) {
+	thread := r.URL.Query().Get("t")
+	token := r.URL.Query().Get("d")
+	if thread == "" || token == "" {
+		b.BadRequest(w, r)
+		return
+	}
 
+	t, err := comments.Load(thread)
+	if err != nil {
+		b.BadRequest(w, r, "Comment thread does not exist.")
+		return
+	}
+
+	if c, err := t.FindByDeleteToken(token); err == nil {
+		t.Delete(c.ID)
+	}
+
+	b.FlashAndRedirect(w, r, "/", "Comment deleted!")
 }
 
 // GetEditToken gets or generates an edit token from the user's session, which

core/forms/settings.go

@@ -9,11 +9,18 @@ import (
 type Settings struct {
 	Title        string
 	AdminEmail   string
+	URL          string
 	RedisEnabled bool
 	RedisHost    string
 	RedisPort    int
 	RedisDB      int
 	RedisPrefix  string
+	MailEnabled  bool
+	MailSender   string
+	MailHost     string
+	MailPort     int
+	MailUsername string
+	MailPassword string
 }
 
 // Validate the form.

core/mail.go

@@ -0,0 +1,121 @@
+package core
+
+import (
+	"bytes"
+	"crypto/tls"
+	"fmt"
+	"html/template"
+	"net/url"
+	"strings"
+
+	"github.com/kirsle/blog/core/models/comments"
+	"github.com/kirsle/blog/core/models/settings"
+	gomail "gopkg.in/gomail.v2"
+)
+
+// Email configuration.
+type Email struct {
+	To             string
+	Admin          bool /* admin view of the email */
+	Subject        string
+	UnsubscribeURL string
+	Data           map[string]interface{}
+
+	Template string
+}
+
+// SendEmail sends an email.
+func (b *Blog) SendEmail(email Email) {
+	s, _ := settings.Load()
+	if !s.Mail.Enabled || s.Mail.Host == "" || s.Mail.Port == 0 || s.Mail.Sender == "" {
+		log.Info("Suppressing email: not completely configured")
+		return
+	}
+
+	// Resolve the template.
+	tmpl, err := b.ResolvePath(email.Template)
+	if err != nil {
+		log.Error("SendEmail: %s", err.Error())
+		return
+	}
+
+	// Render the template to HTML.
+	var html bytes.Buffer
+	t := template.New(tmpl.Basename)
+	t, err = template.ParseFiles(tmpl.Absolute)
+	if err != nil {
+		log.Error("SendEmail: template parsing error: %s", err.Error())
+	}
+	err = t.ExecuteTemplate(&html, tmpl.Basename, email)
+	if err != nil {
+		log.Error("SendEmail: template execution error: %s", err.Error())
+	}
+
+	m := gomail.NewMessage()
+	m.SetHeader("From", s.Mail.Sender)
+	m.SetHeader("To", email.To)
+	m.SetHeader("Subject", email.Subject)
+	m.SetBody("text/html", html.String())
+
+	d := gomail.NewDialer(s.Mail.Host, s.Mail.Port, s.Mail.Username, s.Mail.Password)
+	if b.Debug {
+		d.TLSConfig = &tls.Config{
+			InsecureSkipVerify: true,
+		}
+	}
+	if err := d.DialAndSend(m); err != nil {
+		log.Error("SendEmail: %s", err.Error())
+	}
+}
+
+// NotifyComment sends notification emails about comments.
+func (b *Blog) NotifyComment(c *comments.Comment) {
+	s, _ := settings.Load()
+	if s.Site.URL == "" {
+		log.Error("Can't send comment notification because the site URL is not configured")
+		return
+	}
+
+	// Prepare the email payload.
+	email := Email{
+		Template: ".email/comment.gohtml",
+		Subject:  "Comment Added: " + c.Subject,
+		Data: map[string]interface{}{
+			"Name":    c.Name,
+			"Subject": c.Subject,
+			"Body":    template.HTML(b.RenderMarkdown(c.Body)),
+			"URL":     strings.Trim(s.Site.URL, "/") + c.OriginURL,
+			"QuickDelete": fmt.Sprintf("%s/comments/quick-delete?t=%s&d=%s",
+				strings.Trim(s.Site.URL, "/"),
+				url.QueryEscape(c.ThreadID),
+				url.QueryEscape(c.DeleteToken),
+			),
+		},
+	}
+
+	// Email the site admins.
+	config, _ := settings.Load()
+	if config.Site.AdminEmail != "" {
+		email.To = config.Site.AdminEmail
+		email.Admin = true
+		log.Info("Mail site admin '%s' about comment notification on '%s'", email.To, c.ThreadID)
+		b.SendEmail(email)
+	}
+
+	// Email the subscribers.
+	email.Admin = false
+	m := comments.LoadMailingList()
+	for _, to := range m.List(c.ThreadID) {
+		if to == c.Email {
+			continue // don't email yourself
+		}
+		email.To = to
+		email.UnsubscribeURL = fmt.Sprintf("%s/comments/subscription?t=%s&e=%s",
+			strings.Trim(s.Site.URL, "/"),
+			url.QueryEscape(c.ThreadID),
+			url.QueryEscape(to),
+		)
+		log.Info("Mail subscriber '%s' about comment notification on '%s'", email.To, c.ThreadID)
+		b.SendEmail(email)
+	}
+}

core/models/comments/comments.go

@@ -54,6 +54,7 @@ type Comment struct {
 	Trap2     string        `json:"-"`
 
 	// Even privater fields.
+	IsAuthenticated bool   `json:"-"`
 	Username        string `json:"-"`
 	Editable        bool   `json:"-"`
 	Editing         bool   `json:"-"`
@@ -104,8 +105,6 @@ func (t *Thread) Post(c *Comment) error {
 
 	t.Comments = append(t.Comments, c)
 	DB.Commit(fmt.Sprintf("comments/threads/%s", t.ID), t)
-
-	// TODO: handle subscriptions.
 	return nil
 }
 
@@ -143,7 +142,6 @@ func (t *Thread) Delete(id string) error {
 // FindByDeleteToken finds a comment by its deletion token.
 func (t *Thread) FindByDeleteToken(token string) (*Comment, error) {
 	for _, c := range t.Comments {
-		fmt.Printf("%s <> %s\n", c.DeleteToken, token)
 		if c.DeleteToken == token {
 			return c, nil
 		}

core/models/comments/subscribers.go

@@ -0,0 +1,79 @@
+package comments
+
+import "strings"
+
+// ListDBName is the path to the singleton mailing list manager.
+const ListDBName = "comments/mailing-list"
+
+// MailingList manages subscription data for all comment threads.
+type MailingList struct {
+	Threads map[string]Subscription
+}
+
+// Subscription is the data for a single thread's subscribers.
+type Subscription struct {
+	Emails map[string]bool
+}
+
+// LoadMailingList loads the mailing list, or initializes it if it doesn't exist.
+func LoadMailingList() *MailingList {
+	m := &MailingList{
+		Threads: map[string]Subscription{},
+	}
+	DB.Get(ListDBName, &m)
+	return m
+}
+
+// Subscribe to a comment thread.
+func (m *MailingList) Subscribe(thread, email string) error {
+	email = strings.ToLower(email)
+	t := m.initThread(thread)
+	t.Emails[email] = true
+	return DB.Commit(ListDBName, &m)
+}
+
+// List the subscribers for a thread.
+func (m *MailingList) List(thread string) []string {
+	t := m.initThread(thread)
+	result := []string{}
+	for email := range t.Emails {
+		result = append(result, email)
+	}
+	return result
+}
+
+// Unsubscribe from a comment thread. Returns true if the removal was
+// successful; false indicates the email was not subscribed.
+func (m *MailingList) Unsubscribe(thread, email string) bool {
+	email = strings.ToLower(email)
+	t := m.initThread(thread)
+	if _, ok := t.Emails[email]; ok {
+		delete(t.Emails, email)
+		DB.Commit(ListDBName, &m)
+		return true
+	}
+	return false
+}
+
+// UnsubscribeAll removes the email from all mailing lists.
+func (m *MailingList) UnsubscribeAll(email string) bool {
+	var any bool
+	email = strings.ToLower(email)
+	for thread := range m.Threads {
+		if m.Unsubscribe(thread, email) {
+			any = true
+		}
+	}
+
+	return any
+}
+
+// initialize a thread structure.
+func (m *MailingList) initThread(thread string) Subscription {
+	if _, ok := m.Threads[thread]; !ok {
+		m.Threads[thread] = Subscription{
+			Emails: map[string]bool{},
+		}
+	}
+	return m.Threads[thread]
+}

core/models/settings/settings.go

@@ -19,6 +19,7 @@ type Settings struct {
 	Site struct {
 		Title      string `json:"title"`
 		AdminEmail string `json:"adminEmail"`
+		URL        string `json:"url"`
 	} `json:"site"`
 
 	// Security-related settings.
@@ -37,7 +38,14 @@ type Settings struct {
 	} `json:"redis"`
 
 	// Mail settings
-	Mail struct{} `json:"mail,omitempty"`
+	Mail struct {
+		Enabled  bool   `json:"enabled"`
+		Sender   string `json:"sender"`
+		Host     string `json:"host"`
+		Port     int    `json:"port"`
+		Username string `json:"username"`
+		Password string `json:"password"`
+	} `json:"mail,omitempty"`
 }
 
 // Defaults returns default settings. The app initially sets this on
@@ -52,6 +60,8 @@ func Defaults() *Settings {
 	s.Redis.Host = "localhost"
 	s.Redis.Port = 6379
 	s.Redis.DB = 0
+	s.Mail.Host = "localhost"
+	s.Mail.Port = 25
 	return s
 }
 

core/pages.go

@@ -58,6 +58,7 @@ type Filepath struct {
 	// possible with a file extension injected.
 	// (i.e. "/about" -> "about.html")
 	URI      string
+	Basename string
 	Relative string // Relative path including document root (i.e. "root/about.html")
 	Absolute string // Absolute path on disk (i.e. "/opt/blog/root/about.html")
 }
@@ -92,6 +93,7 @@ func (b *Blog) ResolvePath(path string) (Filepath, error) {
 		// Resolve the file path.
 		relPath := filepath.Join(root, path)
 		absPath, err := filepath.Abs(relPath)
+		basename := filepath.Base(relPath)
 		if err != nil {
 			log.Error("%v", err)
 		}
@@ -101,7 +103,7 @@ func (b *Blog) ResolvePath(path string) (Filepath, error) {
 		// Found an exact hit?
 		if stat, err := os.Stat(absPath); !os.IsNotExist(err) && !stat.IsDir() {
 			debug("Exact filepath found: %s", absPath)
-			return Filepath{path, relPath, absPath}, nil
+			return Filepath{path, basename, relPath, absPath}, nil
 		}
 
 		// Try some supported suffixes.
@@ -117,7 +119,7 @@ func (b *Blog) ResolvePath(path string) (Filepath, error) {
 			test := absPath + suffix
 			if stat, err := os.Stat(test); !os.IsNotExist(err) && !stat.IsDir() {
 				debug("Filepath found via suffix %s: %s", suffix, test)
-				return Filepath{path + suffix, relPath + suffix, test}, nil
+				return Filepath{path + suffix, basename + suffix, relPath + suffix, test}, nil
 			}
 		}
 	}

root/.email/comment.gohtml

@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<meta name="viewport" content="width=device-width">
+	<meta http-equiv="X-UA-Compatible" content="IE=edge">
+	<meta name="x-apple-disable-message-reformatting"><!-- Disable auto-scale in iOS 10 Mail -->
+	<title>{{ .Subject }}</title>
+</head>
+<body width="100%" bgcolor="#FFFFFF" color="#000000" style="margin: 0; mso-line-height-rule: exactly;">
+
+<center>
+	<table width="90%" cellspacing="0" cellpadding="8" style="border: 1px solid #000000">
+		<tr>
+			<td align="left" valign="top" bgcolor="#C0C0C0">
+				<font face="Helvetica,Arial,Verdana-sans-serif" size="6" color="#000000">
+					<b>{{ .Subject }}</b>
+				</font>
+			</td>
+		</tr>
+		<tr>
+			<td align="left" valign="top" bgcolor="#FEFEFE">
+				<font face="Helvetica,Arial,Verdana-sans-serif" size="3" color="#000000">
+					{{ if not .Admin }}
+					Hello,<br><br>
+					{{ end }}
+
+					{{ or .Data.Name "Anonymous" }} has left a comment on: {{ .Data.Subject }}
+					<br><br>
+
+					{{ .Data.Body }}
+					<br><br>
+
+					<hr>
+
+					To view this comment, please go to <a href="{{ .Data.URL }}" target="_blank">{{ .Data.URL }}</a>.
+
+					{{ if .Admin }}
+					<br><br>
+					Was this comment spam? <a href="{{ .Data.QuickDelete }}" target="_blank">Delete it</a>.
+					{{ end }}
+
+					{{ if .UnsubscribeURL }}
+					<br><br>
+					To unsubscribe from this message, visit <a href="{{ .UnsubscribeURL }}" target="_blank">{{ .UnsubscribeURL }}</a>
+					{{ end }}
+				</font>
+			</td>
+		</tr>
+		<tr>
+			<td align="left" valign="top" bgcolor="#C0C0C0">
+				<font face="Helvetica,Arial,Verdana-sans-serif" size="3" color="#000000">
+					This e-mail was automatically generated; do not reply to it.
+				</font>
+			</td>
+		</tr>
+	</table>
+</center>
+
+</body>
+</html>

root/admin/settings.gohtml

@@ -26,6 +26,20 @@
                 placeholder="name@domain.com">
         </div>
 
+        <div class="form-group">
+            <label for="admin-email">URL Root</label>
+            <small class="text-muted d-block">
+                The base absolute URL to your website. This is used to generate
+                emails such as comment notifications. If not provided, these
+                emails will not be sent.
+            </small>
+            <input type="text"
+                class="form-control"
+                name="url"
+                value="{{ .Site.URL }}"
+                placeholder="https://www.example.com/">
+        </div>
+
         <h3>Redis Cache</h3>
 
         <p>
@@ -79,6 +93,64 @@
                 placeholder="blog:">
         </div>
 
+        <h3>Email Settings</h3>
+
+        <div class="form-check">
+            <label class="form-check-label">
+                <input type="checkbox"
+                    class="form-check-input"
+                    name="mail-enabled"
+                    value="true"
+                    {{ if .Mail.Enabled }}checked{{ end }}>
+                    Enable email to be sent by this site
+            </label>
+        </div>
+        <div class="form-group">
+            <label for="mail-sender">Sender Address</label>
+            <input type="email"
+                name="mail-sender"
+                id="mail-sender"
+                class="form-control"
+                value="{{ .Mail.Sender }}"
+                placeholder="no-reply@example.com">
+        </div>
+        <div class="form-group">
+            <label for="mail-host">SMTP Host</label>
+            <input type="text"
+                class="form-control"
+                name="mail-host"
+                id="mail-host"
+                value="{{ .Mail.Host }}"
+                placeholder="localhost">
+        </div>
+        <div class="form-group">
+            <label for="mail-port">SMTP Port</label>
+            <input type="text"
+                class="form-control"
+                name="mail-port"
+                id="mail-port"
+                value="{{ .Mail.Port }}"
+                placeholder="25">
+        </div>
+        <div class="form-group">
+            <label for="mail-username">SMTP Username</label>
+            <small class="text-muted">(optional)</small>
+            <input type="text"
+                class="form-control"
+                name="mail-username"
+                value="{{ .Mail.Username }}"
+                placeholder="">
+        </div>
+        <div class="form-group">
+            <label for="mail-password">SMTP Password</label>
+            <small class="text-muted">(optional)</small>
+            <input type="text"
+                class="form-control"
+                name="mail-password"
+                value="{{ .Mail.Password }}"
+                placeholder="">
+        </div>
+
         <div class="form-group">
             <button type="submit" class="btn btn-primary">Save Settings</button>
             <a href="/admin" class="btn btn-secondary">Cancel</a>

root/blog/entry.gohtml

@@ -2,7 +2,7 @@
 {{ define "content" }}
 
 {{ $p := .Data.Post }}
-{{ RenderPost $p false }}
+{{ RenderPost $p false 0 }}
 
 {{ if and .LoggedIn .CurrentUser.Admin }}
     <small>
@@ -15,7 +15,7 @@
 {{ end }}
 
 {{ if $p.EnableComments }}
-    <h2 class="mt-4">Comments</h2>
+    <h2 id="comments" class="mt-4">Comments</h2>
 
     {{ $idStr := printf "%d" $p.ID}}
     {{ RenderComments $p.Title "post" $idStr }}

root/blog/entry.partial.gohtml

@@ -36,13 +36,19 @@
     {{ end }}
 </div>
 
-{{ if not .IndexView }}<hr>{{ end }}
-
 {{ if $p.Tags }}
     <em class="text-muted float-left pr-3">Tags:</em>
     <ul class="list-inline">
     {{ range $p.Tags }}
-        <li class="list-inline-item"><a href="/tagged/{{ . }}">{{ . }}</a></li>
+        <li class="list-inline-item text-muted"><em><a href="/tagged/{{ . }}">{{ . }}</a></em></li>
     {{ end }}
     </ul>
 {{ end }}
+
+{{ if .IndexView }}
+    <em class="text-muted">
+        <a href="/{{ $p.Fragment }}#comments">{{ .NumComments }} comment{{ if ne .NumComments 1 }}s{{ end }}</a>
+        |
+        <a href="/{{ $p.Fragment }}">Permalink</a>
+    </em>
+{{ end }}

root/blog/index.gohtml

@@ -15,7 +15,7 @@
 
 {{ range .Data.View }}
     {{ $p := .Post }}
-    {{ RenderPost $p true }}
+    {{ RenderPost $p true .NumComments }}
 
     {{ if and $.LoggedIn $.CurrentUser.Admin }}
     <div class="mb-4">

root/bluez/theme.css

@@ -36,6 +36,10 @@ label.form-check-label {
 button {
     cursor: pointer;
 }
+.text-muted a {
+    color: #868e96 !important;
+    text-decoration: underline;
+}
 
 /*
  * Top nav

root/comments/comments.partial.gohtml

@@ -6,8 +6,8 @@
     There is 1 comment on this page.
 {{- else -}}
     There are {{ len $t.Comments }} comments on this page.
-{{- end -}}
+{{- end }}
-<a href="#add-comment">Add your comment.</a>
+<a href="#add-comment">Add yours.</a>
 </p>
 
 {{ range $t.Comments }}
@@ -22,69 +22,7 @@
     <input type="hidden" name="subject" value="{{ .Subject }}">
     <input type="hidden" name="origin" value="{{ .OriginURL }}">
 
-    {{ if not .IsAuthenticated }}
+    {{ template "comment-form" .NewComment }}
-    <div class="form-group row">
-        <label for="name" class="col-2 col-form-label">Your name:</label>
-        <div class="col-10">
-            <input type="text"
-                id="name"
-                name="name"
-                class="form-control"
-                value="{{ .Name }}"
-                placeholder="Anonymous">
-        </div>
-    </div>
-
-    <div class="form-group row">
-        <label for="email" class="col-2 col-form-label">Your email:</label>
-        <div class="col-10">
-            <input type="email"
-                id="email"
-                name="email"
-                class="form-control"
-                aria-describedby="emailHelp"
-                value="{{ .Email }}"
-                placeholder="(optional)">
-            <small id="emailHelp" class="form-text text-muted">
-                Used for your <a href="https://en.gravatar.com/" target="_blank">Gravatar</a>
-                and optional thread subscription. <a href="/privacy">Privacy policy.</a>
-            </small>
-
-            <label class="form-check-label pl-0">
-                <input type="checkbox" name="subscribe" value="true">
-                <small>Notify me of future comments on this page.</small>
-            </label>
-        </div>
-    </div>
-    {{ end }}
-
-    <div class="form-group">
-        <label for="body">Message:</label>
-        <textarea
-            name="body"
-            id="body"
-            cols="40" rows="10"
-            aria-describedby="bodyHelp"
-            class="form-control"></textarea>
-        <small id="bodyHelp" class="form-text text-muted">
-            You may format your message using
-            <a href="https://daringfireball.net/projects/markdown/syntax">Markdown</a>
-            syntax.
-        </small>
-    </div>
-
-    <div class="form-group" style="display: none">
-        <div class="card">
-            <div class="card-header">Sanity Check</div>
-            <div class="card-body">
-                If you happen to be able to see these fields, do not change
-                their values.
-
-                <input type="text" name="url" value="http://" class="form-control" placeholder="Website">
-                <textarea name="comment" cols="80" rows="10" class="form-control" placeholder="Comment"></textarea>
-            </div>
-        </div>
-    </div>
 
     <button type="submit"
         name="submit"

root/comments/entry.partial.gohtml

@@ -51,3 +51,71 @@
     </div>
 </div>
 {{ end }}
+
+{{ define "comment-form" }}
+    {{ if not .IsAuthenticated  }}
+    <div class="form-group row">
+        <label for="name" class="col-2 col-form-label">Your name:</label>
+        <div class="col-10">
+            <input type="text"
+                id="name"
+                name="name"
+                class="form-control"
+                value="{{ .Name }}"
+                placeholder="Anonymous">
+        </div>
+    </div>
+
+    <div class="form-group row">
+        <label for="email" class="col-2 col-form-label">Your email:</label>
+        <div class="col-10">
+            <input type="email"
+                id="email"
+                name="email"
+                class="form-control"
+                aria-describedby="emailHelp"
+                value="{{ .Email }}"
+                placeholder="(optional)">
+            <small id="emailHelp" class="form-text text-muted">
+                Used for your <a href="https://en.gravatar.com/" target="_blank">Gravatar</a>
+                and optional thread subscription. <a href="/comments/subscription" target="_blank">Privacy policy.</a>
+            </small>
+
+            <label class="form-check-label pl-0">
+                <input type="checkbox"{{ if .Subscribe }} checked{{ end }}
+                    name="subscribe"
+                    value="true">
+                <small>Notify me of future comments on this page.</small>
+            </label>
+        </div>
+    </div>
+    {{ end }}
+
+    <div class="form-group">
+        <label for="body">Message:</label>
+        <textarea
+            name="body"
+            id="body"
+            cols="40" rows="10"
+            aria-describedby="bodyHelp"
+            class="form-control">{{ .Body }}</textarea>
+        <small id="bodyHelp" class="form-text text-muted">
+            You may format your message using
+            <a href="https://daringfireball.net/projects/markdown/syntax">Markdown</a>
+            syntax.
+        </small>
+    </div>
+
+    <div class="form-group" style="display: none">
+        <div class="card">
+            <div class="card-header">Sanity Check</div>
+            <div class="card-body">
+                If you happen to be able to see these fields, do not change
+                their values.
+
+                <input type="text" name="url" value="http://" class="form-control" placeholder="Website">
+                <textarea name="comment" cols="80" rows="10" class="form-control" placeholder="Comment"></textarea>
+            </div>
+        </div>
+    </div>
+{{ end }}

root/comments/index.gohtml

@@ -2,7 +2,7 @@
 {{ define "content" }}
 
 {{ with .Data.Comment }}
-    <form action="/comments" method="POST">
+<form action="/comments" method="POST">
     <input type="hidden" name="_csrf" value="{{ $.CSRF }}">
     <input type="hidden" name="thread" value="{{ .ThreadID }}">
     <input type="hidden" name="subject" value="{{ .Subject }}">
@@ -39,75 +39,7 @@
         </button>
         <a href="{{ .OriginURL }}" class="btn btn-primary">Cancel</a>
     {{ else }}
-        {{ if not $.CurrentUser.IsAuthenticated }}
+        {{ template "comment-form" . }}
-        <div class="form-group row">
-            <label for="name" class="col-2 col-form-label">Your name:</label>
-            <div class="col-10">
-                {{ if and $.CurrentUser.IsAuthenticated }}
-                    {{ $.CurrentUser.Name }}
-                {{ else }}
-                    <input type="text"
-                        id="name"
-                        name="name"
-                        class="form-control"
-                        value="{{ .Name }}"
-                        placeholder="Anonymous">
-                {{ end }}
-            </div>
-        </div>
-
-        <div class="form-group row">
-            <label for="email" class="col-2 col-form-label">Your email:</label>
-            <div class="col-10">
-                <input type="email"
-                    id="email"
-                    name="email"
-                    class="form-control"
-                    aria-describedby="emailHelp"
-                    value="{{ .Email }}"
-                    placeholder="(optional)">
-                <small id="emailHelp" class="form-text text-muted">
-                    Used for your <a href="https://en.gravatar.com/" target="_blank">Gravatar</a>
-                    and optional thread subscription. <a href="/privacy">Privacy policy.</a>
-                </small>
-
-                <label class="form-check-label pl-0">
-                    <input type="checkbox"{{ if .Subscribe }} checked{{ end }}
-                        name="subscribe"
-                        value="true">
-                    <small>Notify me of future comments on this page.</small>
-                </label>
-            </div>
-        </div>
-        {{ end }}
-
-        <div class="form-group">
-            <label for="body">Message:</label>
-            <textarea
-                name="body"
-                id="body"
-                cols="40" rows="10"
-                aria-describedby="bodyHelp"
-                class="form-control">{{ .Body }}</textarea>
-            <small id="bodyHelp" class="form-text text-muted">
-                You may format your message using
-                <a href="https://daringfireball.net/projects/markdown/syntax">Markdown</a>
-                syntax.
-            </small>
-        </div>
-
-        <div class="form-group" style="display: none">
-            <div class="card">
-                <div class="card-header">Sanity Check</div>
-                <div class="card-body">
-                    If you happen to be able to see these fields, do not change
-                    their values.
-
-                    <input type="text" name="url" value="http://" class="form-control" placeholder="Website">
-                    <textarea name="comment" cols="80" rows="10" class="form-control" placeholder="Comment"></textarea>
-                </div>
-            </div>
-        </div>
 
         <button type="submit" name="submit" value="preview" class="btn btn-primary">
             Refresh Preview
@@ -116,7 +48,7 @@
             Post Comment
         </button>
     {{ end }}
-    </form>
+</form>
 {{ end }}
 
 {{ end }}

root/comments/subscription.gohtml

@@ -0,0 +1,50 @@
+{{ define "title" }}Manage Comment Subscriptions{{ end }}
+{{ define "content" }}
+
+<h1>Comment Subscriptions</h1>
+
+<p>
+    When leaving comments on this website, you may <em>optionally</em>
+    subscribe to get email notifications when new comments are added to
+    the same thread. This way you can get notified when your question
+    has been answered, for example.
+</p>
+
+<h2>Privacy Policy</h2>
+
+<p>
+    This web blog is open source software, so the following is true as far as
+    the web blog software itself is concerned. Please check with the site
+    administrator for their personal privacy policy.
+</p>
+
+<p>
+    Your email address is used for the following purposes by this web blog:
+</p>
+
+<ul>
+    <li>Showing your <a href="https://www.gravatar.com/" target="_blank">Gravatar</a> next to your comment.</li>
+    <li>With your permission: sending you notifications about future comments on the page.</li>
+</ul>
+
+<h2>Unsubscribe</h2>
+
+<p>
+    To unsubscribe from individual comment threads, use the "Unsubscribe" links
+    in the emails. Or, to unsubcribe from <strong>all</strong> comment threads,
+    enter your email address below.
+</p>
+
+<form class="form-inline" action="/comments/subscription" method="POST">
+    <input type="hidden" name="_csrf" value="{{ .CSRF }}">
+    <label class="sr-only" for="email">Email address</label>
+    <input type="email"
+        name="email"
+        id="email"
+        class="form-control mr-2"
+        placeholder="name@domain.com">
+
+    <button type="submit" class="btn btn-primary">Unsubscribe</button>
+</form>
+
+{{ end }}