add user login

.gitignore

@@ -27,3 +27,4 @@ go.work
 # air config
 .air.toml
 /tmp
+tls/

cmd/web/context.go

@@ -0,0 +1,6 @@
+package main
+
+type contextKey string
+
+const isAuthenticatedContextKey = contextKey("isAuthenticated")
+const userNameContextKey = contextKey("username")

cmd/web/handlers.go

@@ -4,39 +4,132 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
-	"unicode/utf8"
 
 	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
-	"github.com/google/uuid"
+	"git.32bit.cafe/32bitcafe/guestbook/internal/validator"
 )
 
 func (app *application) home(w http.ResponseWriter, r *http.Request) {
-    app.render(w, r, http.StatusOK, "home.tmpl.html", templateData{})
+    data := app.newTemplateData(r)
+    app.render(w, r, http.StatusOK, "home.tmpl.html", data)
+}
+
+type userRegistrationForm struct {
+    Name        string  `schema:"username"`
+    Email       string  `schema:"email"`
+    Password    string  `schema:"password"`
+    validator.Validator `schema:"-"`
 }
 
 func (app *application) getUserRegister(w http.ResponseWriter, r *http.Request) {
-    app.render(w, r, http.StatusOK, "usercreate.view.tmpl.html", templateData{})
+    data := app.newTemplateData(r)
+    data.Form = userRegistrationForm{}
+    app.render(w, r, http.StatusOK, "usercreate.view.tmpl.html", data)
 }
 
 func (app *application) postUserRegister(w http.ResponseWriter, r *http.Request) {
-    err := r.ParseForm()
+    var form userRegistrationForm
+    err := app.decodePostForm(r, &form)
     if err != nil {
+        app.clientError(w, http.StatusBadRequest)
+        return
+    }
+    
+    form.CheckField(validator.NotBlank(form.Name), "name", "This field cannot be blank")
+    form.CheckField(validator.NotBlank(form.Email), "email", "This field cannot be blank")
+    form.CheckField(validator.Matches(form.Email, validator.EmailRX), "email", "This field must be a valid email address")
+    form.CheckField(validator.NotBlank(form.Password), "password", "This field cannot be blank")
+    form.CheckField(validator.MinChars(form.Password, 8), "password", "This field must be at least 8 characters long")
+
+    if !form.Valid() {
+        data := app.newTemplateData(r)
+        data.Form = form
+        app.render(w, r, http.StatusUnprocessableEntity, "usercreate.view.tmpl.html", data)
+        return
+    }
+
+    shortId := app.createShortId()
+    err = app.users.Insert(shortId, form.Name, form.Email, form.Password)
+    if err != nil {
+        if errors.Is(err, models.ErrDuplicateEmail) {
+            form.AddFieldError("email", "Email address is already in use")
+            data := app.newTemplateData(r)
+            data.Form = form
+            app.render(w ,r, http.StatusUnprocessableEntity, "usercreate.view.tmpl.html", data)
+        } else {
             app.serverError(w, r, err)
         }
-    username := r.Form.Get("username")
+        return
-    email := r.Form.Get("email")
+    }
-    rawid, err := app.users.Insert(username, email)
+    app.sessionManager.Put(r.Context(), "flash", "Registration successful. Please log in.")
+    http.Redirect(w, r, "/users/login", http.StatusSeeOther)
+}
+
+type userLoginForm struct {
+    Email       string  `schema:"email"`
+    Password    string  `schema:"password"`
+    validator.Validator `schema:"-"`
+}
+
+func (app *application) getUserLogin(w http.ResponseWriter, r *http.Request) {
+    data := app.newTemplateData(r)
+    data.Form = userLoginForm{}
+    app.render(w, r, http.StatusOK, "login.view.tmpl.html", data)
+}
+
+func (app *application) postUserLogin(w http.ResponseWriter, r *http.Request) {
+    var form userLoginForm
+
+    err := app.decodePostForm(r, &form)
+    if err != nil {
+        app.clientError(w, http.StatusBadRequest)
+    }
+
+    form.CheckField(validator.NotBlank(form.Email), "email", "This field cannot be blank")
+    form.CheckField(validator.Matches(form.Email, validator.EmailRX), "email", "This field must be a valid email address")
+    form.CheckField(validator.NotBlank(form.Password), "password", "This field cannot be blank")
+
+    if !form.Valid() {
+        data := app.newTemplateData(r)
+        data.Form = userLoginForm{}
+        app.render(w, r, http.StatusUnprocessableEntity, "login.view.tmpl.html", data)
+        return
+    }
+
+    id, err := app.users.Authenticate(form.Email, form.Password)
+    if err != nil {
+        if errors.Is(err, models.ErrInvalidCredentials) {
+            form.AddNonFieldError("Email or password is incorrect")
+            data := app.newTemplateData(r)
+            data.Form = form
+            app.render(w, r, http.StatusUnprocessableEntity, "login.view.tmpl.html", data)
+        } else {
+            app.serverError(w, r, err)
+        }
+        return
+    }
+
+    err = app.sessionManager.RenewToken(r.Context())
     if err != nil {
         app.serverError(w, r, err)
         return
     }
-    id, err := encodeIdB64(rawid)
+
+    app.sessionManager.Put(r.Context(), "authenticatedUserId", id)
+
+    http.Redirect(w, r, "/", http.StatusSeeOther)
+}
+
+func (app *application) postUserLogout(w http.ResponseWriter, r *http.Request) {
+    err := app.sessionManager.RenewToken(r.Context())
     if err != nil {
         app.serverError(w, r, err)
         return
     }
-    http.Redirect(w, r, fmt.Sprintf("/users/%s", id), http.StatusSeeOther)
+
+    app.sessionManager.Remove(r.Context(), "authenticatedUserId")
+    app.sessionManager.Put(r.Context(), "flash", "You've been logged out successfully!")
+    http.Redirect(w, r, "/", http.StatusSeeOther)
 }
 
 func (app *application) getUsersList(w http.ResponseWriter, r *http.Request) {
@@ -45,19 +138,14 @@ func (app *application) getUsersList(w http.ResponseWriter, r *http.Request) {
         app.serverError(w, r, err)
         return
     }
-    app.render(w, r, http.StatusOK, "userlist.view.tmpl.html", templateData{
+    data := app.newTemplateData(r)
-        Users: users,
+    data.Users = users
-    })
+    app.render(w, r, http.StatusOK, "userlist.view.tmpl.html", data)
 }
 
 func (app *application) getUser(w http.ResponseWriter, r *http.Request) {
-    rawid := r.PathValue("id") 
+    slug := r.PathValue("id") 
-    id, err := decodeIdB64(rawid)
+    user, err := app.users.Get(slugToShortId(slug))
-    if err != nil {
-        app.serverError(w, r, err)
-        return
-    }
-    user, err := app.users.Get(id)
     if err != nil {
         if errors.Is(err, models.ErrNoRecord) {
             http.NotFound(w, r)
@@ -66,13 +154,14 @@ func (app *application) getUser(w http.ResponseWriter, r *http.Request) {
         }
         return
     }
-    app.render(w, r, http.StatusOK, "user.view.tmpl.html", templateData{
+    data := app.newTemplateData(r)
-        User: user,
+    data.User = user
-    })
+    app.render(w, r, http.StatusOK, "user.view.tmpl.html", data)
 }
 
 func (app *application) getGuestbookCreate(w http.ResponseWriter, r* http.Request) {
-    app.render(w, r, http.StatusOK, "guestbookcreate.view.tmpl.html", templateData{})
+    data := app.newTemplateData(r)
+    app.render(w, r, http.StatusOK, "guestbookcreate.view.tmpl.html", data)
 }
 
 func (app *application) postGuestbookCreate(w http.ResponseWriter, r* http.Request) {
@@ -82,42 +171,37 @@ func (app *application) postGuestbookCreate(w http.ResponseWriter, r* http.Reque
         return
     }
     siteUrl := r.Form.Get("siteurl")
-    app.logger.Debug("creating guestbook for site", "siteurl", siteUrl)
+    shortId := app.createShortId()
-    userId := getUserId()
+    _, err = app.guestbooks.Insert(shortId, siteUrl, 0)
-    rawid, err := app.guestbooks.Insert(siteUrl, userId)
-    if err != nil {
-        app.serverError(w, r, err)
-        return
-    }
-    id, err := encodeIdB64(rawid)
     if err != nil {
         app.serverError(w, r, err)
         return
     }
     app.sessionManager.Put(r.Context(), "flash", "Guestbook successfully created!")
-    http.Redirect(w, r, fmt.Sprintf("/guestbooks/%s", id), http.StatusSeeOther)
+    http.Redirect(w, r, fmt.Sprintf("/guestbooks/%s", shortIdToSlug(shortId)), http.StatusSeeOther)
 }
 
 func (app *application) getGuestbookList(w http.ResponseWriter, r *http.Request) {
-    userId := getUserId()
+    userId := app.sessionManager.GetInt64(r.Context(), "authenticatedUserId")
     guestbooks, err := app.guestbooks.GetAll(userId)
     if err != nil {
         app.serverError(w, r, err)
         return
     }
-    app.render(w, r, http.StatusOK, "guestbooklist.view.tmpl.html", templateData{
+    user, err := app.users.GetById(userId)
-        Guestbooks: guestbooks,
-    })
-}
-
-func (app *application) getGuestbook(w http.ResponseWriter, r *http.Request) {
-    rawId := r.PathValue("id")
-    id, err := decodeIdB64(rawId)
     if err != nil {
         app.serverError(w, r, err)
         return
     }
-    guestbook, err := app.guestbooks.Get(id)
+    data := app.newTemplateData(r)
+    data.Guestbooks = guestbooks
+    data.User = user
+    app.render(w, r, http.StatusOK, "guestbooklist.view.tmpl.html", data)
+}
+
+func (app *application) getGuestbook(w http.ResponseWriter, r *http.Request) {
+    slug := r.PathValue("id")
+    guestbook, err := app.guestbooks.Get(slugToShortId(slug))
     if err != nil {
         if errors.Is(err, models.ErrNoRecord) {
             http.NotFound(w, r)
@@ -126,7 +210,7 @@ func (app *application) getGuestbook(w http.ResponseWriter, r *http.Request) {
         }
         return
     }
-    comments, err := app.guestbookComments.GetAll(id)
+    comments, err := app.guestbookComments.GetAll(guestbook.ID)
     if err != nil {
         app.serverError(w, r, err)
         return
@@ -138,13 +222,8 @@ func (app *application) getGuestbook(w http.ResponseWriter, r *http.Request) {
 }
 
 func (app *application) getGuestbookComments(w http.ResponseWriter, r *http.Request) {
-    rawId := r.PathValue("id")
+    slug := r.PathValue("id")
-    id, err := decodeIdB64(rawId)
+    guestbook, err := app.guestbooks.Get(slugToShortId(slug))
-    if err != nil {
-        app.serverError(w, r, err)
-        return
-    }
-    guestbook, err := app.guestbooks.Get(id)
     if err != nil {
         if errors.Is(err, models.ErrNoRecord) {
             http.NotFound(w, r)
@@ -153,70 +232,83 @@ func (app *application) getGuestbookComments(w http.ResponseWriter, r *http.Requ
         }
         return
     }
-    comments, err := app.guestbookComments.GetAll(id)
+    comments, err := app.guestbookComments.GetAll(guestbook.ID)
     if err != nil {
         app.serverError(w, r, err)
         return
     }
-    app.render(w, r, http.StatusOK, "commentlist.view.tmpl.html", templateData{
+    data := app.newTemplateData(r)
-        Guestbook: guestbook,
+    data.Guestbook = guestbook
-        Comments: comments,
+    data.Comments = comments
-    })
+    app.render(w, r, http.StatusOK, "commentlist.view.tmpl.html", data)
+}
+
+type commentCreateForm struct {
+    AuthorName  string  `schema:"authorname"`
+    AuthorEmail string  `schema:"authoremail"`
+    AuthorSite  string  `schema:"authorsite"`
+    Content     string  `schema:"content,required"`
+    validator.Validator `schema:"-"`
 }
 
 func (app *application) getGuestbookCommentCreate(w http.ResponseWriter, r *http.Request) {
-    rawId := r.PathValue("id")
+    slug := r.PathValue("id")
-    id, err := decodeIdB64(rawId)
+    guestbook, err := app.guestbooks.Get(slugToShortId(slug))
     if err != nil {
+        if errors.Is(err, models.ErrNoRecord) {
             http.NotFound(w, r)
+        } else {
+            app.serverError(w, r, err)
         }
-    app.render(w, r, http.StatusOK, "commentcreate.view.tmpl.html", templateData{
+        return
-        Guestbook: models.Guestbook{
+    }
-            ID: id,
+    data := app.newTemplateData(r)
-        },
+    data.Guestbook = guestbook
-    })
+    data.Form = commentCreateForm{}
+    app.render(w, r, http.StatusOK, "commentcreate.view.tmpl.html", data)
 }
 
 func (app *application) postGuestbookCommentCreate(w http.ResponseWriter, r *http.Request) {
-    rawGbId := r.PathValue("id")
+    guestbookSlug := r.PathValue("id")
-    gbId, err := decodeIdB64(rawGbId)
+    guestbook, err := app.guestbooks.Get(slugToShortId(guestbookSlug))
     if err != nil {
+        if errors.Is(err, models.ErrNoRecord) {
+            http.NotFound(w, r)
+        } else {
             app.serverError(w, r, err)
+        }
         return
     }
-    err = r.ParseForm()
+
+    var form commentCreateForm
+    err = app.decodePostForm(r, &form)
     if err != nil {
         app.clientError(w, http.StatusBadRequest)
         return
     }
-    authorName := r.PostForm.Get("authorname")
-    authorEmail := r.PostForm.Get("authoremail")
-    authorSite := r.PostForm.Get("authorsite")
-    content := r.PostForm.Get("content")
 
-    fieldErrors := make(map[string]string)
+    form.CheckField(validator.NotBlank(form.AuthorName), "authorName", "This field cannot be blank")
-    if strings.TrimSpace(authorName) == "" {
+    form.CheckField(validator.MaxChars(form.AuthorName, 256), "authorName", "This field cannot be more than 256 characters long")
-        fieldErrors["title"] = "This field cannot be blank"
+    form.CheckField(validator.NotBlank(form.AuthorEmail), "authorEmail", "This field cannot be blank")
-    } else if utf8.RuneCountInString(authorName) > 256 {
+    form.CheckField(validator.MaxChars(form.AuthorEmail, 256), "authorEmail", "This field cannot be more than 256 characters long")
-        fieldErrors["title"] = "This field cannot be more than 256 characters long"
+    form.CheckField(validator.NotBlank(form.AuthorSite), "authorSite", "This field cannot be blank")
-    }
+    form.CheckField(validator.MaxChars(form.AuthorSite, 256), "authorSite", "This field cannot be more than 256 characters long")
-    if strings.TrimSpace(content) == "" {
+    form.CheckField(validator.NotBlank(form.Content), "content", "This field cannot be blank")
-        fieldErrors["content"] = "This field cannot be blank"
+
-    }
+    if !form.Valid() {
-    if len(fieldErrors) > 0 {
+        data := app.newTemplateData(r)
-        fmt.Fprint(w, fieldErrors)
+        data.Guestbook = guestbook
+        data.Form = form
+        app.render(w, r, http.StatusUnprocessableEntity, "commentcreate.view.tmpl.html", data)
         return
     }
     
-    commentId, err := app.guestbookComments.Insert(gbId, uuid.UUID{}, authorName, authorEmail, authorSite, content, "", true)
+    shortId := app.createShortId()
+    _, err = app.guestbookComments.Insert(shortId, guestbook.ID, 0, form.AuthorName, form.AuthorEmail, form.AuthorSite, form.Content, "", true)
     if err != nil {
         app.serverError(w, r, err)
         return
     }
-    _, err = encodeIdB64(commentId)
+    app.sessionManager.Put(r.Context(), "flash", "Comment successfully posted!")
-    if err != nil {
+    http.Redirect(w, r, fmt.Sprintf("/guestbooks/%s", guestbookSlug), http.StatusSeeOther)
-        app.serverError(w, r, err)
-        return
-    }
-    http.Redirect(w, r, fmt.Sprintf("/guestbooks/%s", rawGbId), http.StatusSeeOther)
 }

cmd/web/helpers.go

@@ -1,11 +1,14 @@
 package main
 
 import (
-	"encoding/base64"
+	"errors"
 	"fmt"
+	"math"
 	"net/http"
+	"strconv"
+	"time"
 
-	"github.com/google/uuid"
+	"github.com/gorilla/schema"
 )
 
 func (app *application) serverError(w http.ResponseWriter, r *http.Request, err error) {
@@ -37,24 +40,60 @@ func (app *application) render(w http.ResponseWriter, r *http.Request, status in
     }
 }
 
-func encodeIdB64 (id uuid.UUID) (string, error) {
+func (app *application) nextSequence () uint16 {
-    b, err := id.MarshalBinary()
+    val := app.sequence
-    if err != nil {
+    if app.sequence == math.MaxUint16 {
-        return "", err
+        app.sequence = 0
+    } else {
+        app.sequence += 1
     }
-    s := base64.RawURLEncoding.EncodeToString(b)
+    return val
-    return s, nil
 }
 
-func decodeIdB64 (id string) (uuid.UUID, error) {
+func (app *application) createShortId () uint64 {
-    b, err := base64.RawURLEncoding.DecodeString(id)
+    now := time.Now().UTC()
-    var u uuid.UUID
+    epoch, err := time.Parse(time.RFC822Z, "01 Jan 20 00:00 -0000")
     if err != nil {
-        return u, err
+        fmt.Println(err)
+        return 0
     }
-    err = u.UnmarshalBinary(b)
+    d := now.Sub(epoch)
+    ms := d.Milliseconds()
+    seq := app.nextSequence()
+    return (uint64(ms) & 0x0FFFFFFFFFFFFFFF) | (uint64(seq) << 48)
+}
+
+func shortIdToSlug(id uint64) string {
+    slug := strconv.FormatUint(id, 36)
+    return slug
+}
+
+func slugToShortId(slug string) uint64 {
+    id, _ := strconv.ParseUint(slug, 36, 64)
+    return id
+}
+
+func (app *application) decodePostForm(r *http.Request, dst any) error {
+    err := r.ParseForm()
     if err != nil {
-        return u, err
+        return err
     }
-    return u, nil
+
+    err = app.formDecoder.Decode(dst, r.PostForm)
+    if err != nil {
+        var multiErrors *schema.MultiError
+        if !errors.As(err, &multiErrors) {
+            panic(err)
+        }
+        return err
+    }
+    return nil
+}
+
+func (app *application) isAuthenticated(r *http.Request) bool {
+    isAuthenticated, ok := r.Context().Value(isAuthenticatedContextKey).(bool)
+    if !ok {
+        return false
+    }
+    return isAuthenticated
 }

cmd/web/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"crypto/tls"
 	"database/sql"
 	"flag"
 	"log/slog"
@@ -12,17 +13,19 @@ import (
 	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
 	"github.com/alexedwards/scs/sqlite3store"
 	"github.com/alexedwards/scs/v2"
-	"github.com/google/uuid"
+	"github.com/gorilla/schema"
 	_ "github.com/mattn/go-sqlite3"
 )
 
 type application struct {
+    sequence uint16
     logger *slog.Logger
     templateCache map[string]*template.Template
     guestbooks *models.GuestbookModel
     users *models.UserModel
     guestbookComments *models.GuestbookCommentModel
     sessionManager *scs.SessionManager
+    formDecoder *schema.Decoder
 }
 
 func main() {
@@ -49,18 +52,37 @@ func main() {
     sessionManager.Store = sqlite3store.New(db)
     sessionManager.Lifetime = 12 * time.Hour
 
+    formDecoder := schema.NewDecoder()
+    formDecoder.IgnoreUnknownKeys(true)
+
     app := &application{
+        sequence: 0,
         templateCache: templateCache,
         logger: logger,
         sessionManager: sessionManager,
         guestbooks: &models.GuestbookModel{DB: db},
         users: &models.UserModel{DB: db},
         guestbookComments: &models.GuestbookCommentModel{DB: db},
+        formDecoder: formDecoder,
+    }
+
+    tlsConfig := &tls.Config{
+        CurvePreferences: []tls.CurveID{tls.X25519, tls.CurveP256},
+    }
+
+    srv := &http.Server {
+        Addr: *addr,
+        Handler: app.routes(),
+        ErrorLog: slog.NewLogLogger(logger.Handler(), slog.LevelError),
+        TLSConfig: tlsConfig,
+        IdleTimeout: time.Minute,
+        ReadTimeout: 5 * time.Second,
+        WriteTimeout: 10 * time.Second,
     }
 
     logger.Info("Starting server", slog.Any("addr", *addr))
 
-    err = http.ListenAndServe(*addr, app.routes());
+    err = srv.ListenAndServeTLS("./tls/cert.pem", "./tls/key.pem")
     logger.Error(err.Error())
     os.Exit(1)
 }
@@ -76,7 +98,6 @@ func openDB(dsn string) (*sql.DB, error) {
     return db, nil
 }
 
-func getUserId() uuid.UUID {
+func getUserId() int64 {
-    userId, _ := decodeIdB64("laINnbnkTtyN5SYoCfSbXw")
+    return 1
-    return userId
 }

cmd/web/middleware.go

@@ -1,8 +1,11 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"net/http"
+
+	"github.com/justinas/nosurf"
 )
 
 func (app *application) logRequest (next http.Handler) http.Handler {
@@ -23,7 +26,7 @@ func commonHeaders (next http.Handler) http.Handler {
         w.Header().Set("Content-Security-Policy", "default-src 'self'; style-src 'self' fonts.googleapis.com; font-src fonts.gstatic.com")
         w.Header().Set("Referrer-Policy", "origin-when-cross-origin")
         w.Header().Set("X-Content-Type-Options", "nosniff")
-        w.Header().Set("X-Frame-Options", "deny")
+        // w.Header().Set("X-Frame-Options", "deny")
         w.Header().Set("X-XSS-Protection", "0")
         next.ServeHTTP(w, r)
     })
@@ -41,3 +44,45 @@ func (app *application) recoverPanic(next http.Handler) http.Handler {
         next.ServeHTTP(w, r)
     })
 }
+
+func (app *application) requireAuthentication(next http.Handler) http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        if !app.isAuthenticated(r) {
+            http.Redirect(w, r, "/users/login", http.StatusSeeOther)
+            return
+        }
+        w.Header().Add("Cache-Control", "no-store")
+        next.ServeHTTP(w, r)
+    })
+}
+
+func noSurf(next http.Handler) http.Handler {
+    csrfHandler := nosurf.New(next)
+    csrfHandler.SetBaseCookie(http.Cookie{
+        HttpOnly: true,
+        Path: "/",
+        Secure: true,
+    })
+
+    return csrfHandler
+}
+
+func (app *application) authenticate(next http.Handler) http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        id := app.sessionManager.GetInt64(r.Context(), "authenticatedUserId")
+        if id == 0 {
+            next.ServeHTTP(w, r)
+            return
+        }
+        exists, err := app.users.Exists(id)
+        if err != nil {
+            app.serverError(w, r, err)
+            return
+        }
+        if exists {
+            ctx := context.WithValue(r.Context(), isAuthenticatedContextKey, true)
+            r = r.WithContext(ctx)
+        }
+        next.ServeHTTP(w, r)
+    })
+}

cmd/web/routes.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"net/http"
+
+	"github.com/justinas/alice"
 )
 
 func (app *application) routes() http.Handler {
@@ -9,17 +11,28 @@ func (app *application) routes() http.Handler {
     fileServer := http.FileServer(http.Dir("./ui/static"))
     mux.Handle("GET /static/", http.StripPrefix("/static", fileServer))
     
-    mux.Handle("/{$}", app.sessionManager.LoadAndSave(http.HandlerFunc(app.home)))
+    dynamic := alice.New(app.sessionManager.LoadAndSave, noSurf, app.authenticate)
-    mux.Handle("GET /users", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getUsersList)))
+
-    mux.Handle("GET /users/{id}", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getUser)))
+    mux.Handle("/{$}", dynamic.ThenFunc(app.home))
-    mux.Handle("GET /users/register", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getUserRegister)))
+    mux.Handle("POST /guestbooks/{id}/comments/create", dynamic.ThenFunc(app.postGuestbookCommentCreate))
-    mux.Handle("POST /users/register", app.sessionManager.LoadAndSave(http.HandlerFunc(app.postUserRegister)))
+    mux.Handle("GET /guestbooks/{id}", dynamic.ThenFunc(app.getGuestbook))
-    mux.Handle("GET /guestbooks", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbookList)))
+    mux.Handle("GET /users/register", dynamic.ThenFunc(app.getUserRegister))
-    mux.Handle("GET /guestbooks/{id}", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbook)))
+    mux.Handle("POST /users/register", dynamic.ThenFunc(app.postUserRegister))
-    mux.Handle("GET /guestbooks/create", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbookCreate)))
+    mux.Handle("GET /users/login", dynamic.ThenFunc(app.getUserLogin))
-    mux.Handle("POST /guestbooks/create", app.sessionManager.LoadAndSave(http.HandlerFunc(app.postGuestbookCreate)))
+    mux.Handle("POST /users/login", dynamic.ThenFunc(app.postUserLogin))
-    mux.Handle("GET /guestbooks/{id}/comments/create", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbookCommentCreate)))
+
-    mux.Handle("POST /guestbooks/{id}/comments/create", app.sessionManager.LoadAndSave(http.HandlerFunc(app.postGuestbookCommentCreate)))
+    protected := dynamic.Append(app.requireAuthentication)
-    return app.recoverPanic(app.logRequest(commonHeaders(mux)))
+
+    mux.Handle("GET /users", protected.ThenFunc(app.getUsersList))
+    mux.Handle("GET /users/{id}", protected.ThenFunc(app.getUser))
+    mux.Handle("POST /users/logout", protected.ThenFunc(app.postUserLogout))
+    mux.Handle("GET /guestbooks", protected.ThenFunc(app.getGuestbookList))
+    mux.Handle("GET /guestbooks/create", protected.ThenFunc(app.getGuestbookCreate))
+    mux.Handle("POST /guestbooks/create", protected.ThenFunc(app.postGuestbookCreate))
+    mux.Handle("GET /guestbooks/{id}/comments/create", protected.ThenFunc(app.getGuestbookCommentCreate))
+
+    standard := alice.New(app.recoverPanic, app.logRequest, commonHeaders)
+
+    return standard.Then(mux)
 }
 

cmd/web/templates.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
+	"github.com/justinas/nosurf"
 )
 
 type templateData struct {
@@ -18,6 +19,9 @@ type templateData struct {
     Comment models.GuestbookComment
     Comments []models.GuestbookComment
     Flash string
+    Form any
+    IsAuthenticated bool
+    CSRFToken string
 }
 
 func humanDate(t time.Time) string {
@@ -26,8 +30,8 @@ func humanDate(t time.Time) string {
 
 var functions = template.FuncMap {
     "humanDate": humanDate,
-    "encodeId": encodeIdB64,
+    "shortIdToSlug": shortIdToSlug,
-    "decodeId": decodeIdB64,
+    "slugToShortId": slugToShortId,
 }
 
 func newTemplateCache() (map[string]*template.Template, error) {
@@ -59,5 +63,7 @@ func (app *application) newTemplateData(r *http.Request) templateData {
     return templateData {
         CurrentYear: time.Now().Year(),
         Flash: app.sessionManager.PopString(r.Context(), "flash"),
+        IsAuthenticated: app.isAuthenticated(r),
+        CSRFToken: nosurf.Token(r),
     }
 }

db/create-tables-sqlite.sql

@@ -1,14 +1,20 @@
 CREATE TABLE users (
-    Id blob(16) primary key,
+    Id integer primary key autoincrement,
+    ShortId integer UNIQUE NOT NULL,
     Username varchar(32) NOT NULL,
-    Email varchar(256) NOT NULL,
+    Email varchar(256) UNIQUE NOT NULL,
-    IsDeleted boolean NOT NULL DEFAULT FALSE
+    IsDeleted boolean NOT NULL DEFAULT FALSE,
-) WITHOUT ROWID;
+    IsBanned boolean NOT NULL DEFAULT FALSE,
+    HashedPassword char(60) NOT NULL,
+    Created datetime NOT NULL
+);
 
 CREATE TABLE guestbooks (
-    Id blob(16) primary key,
+    Id integer primary key autoincrement,
+    ShortId integer UNIQUE NOT NULL,
     SiteUrl varchar(512) NOT NULL,
     UserId blob(16) NOT NULL,
+    Created datetime NOT NULL,
     IsDeleted boolean NOT NULL DEFAULT FALSE,
     IsActive boolean NOT NULL DEFAULT TRUE,
     FOREIGN KEY (UserId) REFERENCES users(Id)
@@ -17,7 +23,8 @@ CREATE TABLE guestbooks (
 );
 
 CREATE TABLE guestbook_comments (
-    Id blob(16) primary key,
+    Id integer primary key autoincrement,
+    ShortId integer UNIQUE NOT NULL,
     GuestbookId blob(16) NOT NULL,
     ParentId blob(16),
     AuthorName varchar(256) NOT NULL,
@@ -25,6 +32,7 @@ CREATE TABLE guestbook_comments (
     AuthorSite varchar(256),
     CommentText text NOT NULL,
     PageUrl varchar(256),
+    Created datetime NOT NULL,
     IsPublished boolean NOT NULL DEFAULT TRUE,
     IsDeleted boolean NOT NULL DEFAULT FALSE,
     FOREIGN KEY (GuestbookId) 

go.mod

@@ -8,3 +8,10 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/mattn/go-sqlite3 v1.14.6
 )
+
+require (
+	github.com/gorilla/schema v1.4.1 // indirect
+	github.com/justinas/alice v1.2.0 // indirect
+	github.com/justinas/nosurf v1.1.1 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+)

go.sum

@@ -4,5 +4,13 @@ github.com/alexedwards/scs/v2 v2.8.0 h1:h31yUYoycPuL0zt14c0gd+oqxfRwIj6SOjHdKRZx
 github.com/alexedwards/scs/v2 v2.8.0/go.mod h1:ToaROZxyKukJKT/xLcVQAChi5k6+Pn1Gvmdl7h3RRj8=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/schema v1.4.1 h1:jUg5hUjCSDZpNGLuXQOgIWGdlgrIdYvgQ0wZtdK1M3E=
+github.com/gorilla/schema v1.4.1/go.mod h1:Dg5SSm5PV60mhF2NFaTV1xuYYj8tV8NOPRo4FggUMnM=
+github.com/justinas/alice v1.2.0 h1:+MHSA/vccVCF4Uq37S42jwlkvI2Xzl7zTPCN5BnZNVo=
+github.com/justinas/alice v1.2.0/go.mod h1:fN5HRH/reO/zrUflLfTN43t3vXvKzvZIENsNEe7i7qA=
+github.com/justinas/nosurf v1.1.1 h1:92Aw44hjSK4MxJeMSyDa7jwuI9GR2J/JCQiaKvXXSlk=
+github.com/justinas/nosurf v1.1.1/go.mod h1:ALpWdSbuNGy2lZWtyXdjkYv4edL23oSEgfBT1gPJ5BQ=
 github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
+golang.org/x/crypto v0.29.0 h1:L5SG1JTTXupVV3n6sUqMTeWbjAyfPwoda2DLX8J8FrQ=
+golang.org/x/crypto v0.29.0/go.mod h1:+F4F4N5hv6v38hfeYwTdx20oUvLLc+QfrE9Ax9HtgRg=

internal/models/errors.go

@@ -2,4 +2,10 @@ package models
 
 import "errors"
 
-var ErrNoRecord = errors.New("models: no matching record found")
+var (
+    ErrNoRecord = errors.New("models: no matching record found")
+
+    ErrInvalidCredentials = errors.New("models: invalid credentials")
+
+    ErrDuplicateEmail = errors.New("models: duplicate email")
+)

internal/models/guestbook.go

@@ -2,14 +2,15 @@ package models
 
 import (
 	"database/sql"
-
+	"time"
-	"github.com/google/uuid"
 )
 
 type Guestbook struct {
-    ID uuid.UUID
+    ID int64
+    ShortId uint64
     SiteUrl string
-    UserId uuid.UUID
+    UserId int64
+    Created time.Time
     IsDeleted bool
     IsActive bool
 }
@@ -18,23 +19,26 @@ type GuestbookModel struct {
     DB *sql.DB
 }
 
-func (m *GuestbookModel) Insert(siteUrl string, userId uuid.UUID) (uuid.UUID, error) {
+func (m *GuestbookModel) Insert(shortId uint64, siteUrl string, userId int64) (int64, error) {
-    id := uuid.New()
+    stmt := `INSERT INTO guestbooks (ShortId, SiteUrl, UserId, Created, IsDeleted, IsActive)
-    stmt := `INSERT INTO guestbooks (Id, SiteUrl, UserId, IsDeleted, IsActive)
+    VALUES(?, ?, ?, ?, FALSE, TRUE)`
-    VALUES(?, ?, ?, FALSE, TRUE)`
+    result, err := m.DB.Exec(stmt, shortId, siteUrl, userId, time.Now().UTC())
-    _, err := m.DB.Exec(stmt, id, siteUrl, userId)
     if err != nil {
-        return uuid.UUID{}, err
+        return -1, err
+    }
+    id, err := result.LastInsertId()
+    if err != nil {
+        return -1, err
     }
     return id, nil
 }
 
-func (m *GuestbookModel) Get(id uuid.UUID) (Guestbook, error) {
+func (m *GuestbookModel) Get(shortId uint64) (Guestbook, error) {
-    stmt := `SELECT Id, SiteUrl, UserId, IsDeleted, IsActive FROM guestbooks
+    stmt := `SELECT Id, ShortId, SiteUrl, UserId, Created, IsDeleted, IsActive FROM guestbooks
-    WHERE id = ?`
+    WHERE ShortId = ?`
-    row := m.DB.QueryRow(stmt, id)
+    row := m.DB.QueryRow(stmt, shortId)
     var g Guestbook
-    err := row.Scan(&g.ID, &g.SiteUrl, &g.UserId, &g.IsDeleted, &g.IsActive)
+    err := row.Scan(&g.ID, &g.ShortId, &g.SiteUrl, &g.UserId, &g.Created, &g.IsDeleted, &g.IsActive)
     if err != nil {
         return Guestbook{}, err
     }
@@ -42,8 +46,8 @@ func (m *GuestbookModel) Get(id uuid.UUID) (Guestbook, error) {
     return g, nil
 }
 
-func (m *GuestbookModel) GetAll(userId uuid.UUID) ([]Guestbook, error) {
+func (m *GuestbookModel) GetAll(userId int64) ([]Guestbook, error) {
-    stmt := `SELECT Id, SiteUrl, UserId, IsDeleted, IsActive FROM guestbooks
+    stmt := `SELECT Id, ShortId, SiteUrl, UserId, Created, IsDeleted, IsActive FROM guestbooks
     WHERE UserId = ?`
     rows, err := m.DB.Query(stmt, userId)
     if err != nil {
@@ -52,7 +56,7 @@ func (m *GuestbookModel) GetAll(userId uuid.UUID) ([]Guestbook, error) {
     var guestbooks []Guestbook
     for rows.Next() {
         var g Guestbook
-        err = rows.Scan(&g.ID, &g.SiteUrl, &g.UserId, &g.IsDeleted, &g.IsActive)
+        err = rows.Scan(&g.ID, &g.ShortId, &g.SiteUrl, &g.UserId, &g.Created, &g.IsDeleted, &g.IsActive)
         if err != nil {
             return nil, err
         }

internal/models/guestbookcomment.go

@@ -2,19 +2,20 @@ package models
 
 import (
 	"database/sql"
-
+	"time"
-	"github.com/google/uuid"
 )
 
 type GuestbookComment struct {
-    ID uuid.UUID
+    ID int64
-    GuestbookId uuid.UUID
+    ShortId uint64
-    ParentId uuid.UUID
+    GuestbookId int64
+    ParentId int64
     AuthorName string
     AuthorEmail string
     AuthorSite string
     CommentText string
     PageUrl string
+    Created time.Time
     IsPublished bool
     IsDeleted bool
 }
@@ -23,35 +24,38 @@ type GuestbookCommentModel struct {
     DB *sql.DB
 }
 
-func (m *GuestbookCommentModel) Insert(guestbookId, parentId uuid.UUID, authorName,
+func (m *GuestbookCommentModel) Insert(shortId uint64, guestbookId, parentId int64, authorName,
-    authorEmail, authorSite, commentText, pageUrl string, isPublished bool) (uuid.UUID, error) {
+    authorEmail, authorSite, commentText, pageUrl string, isPublished bool) (int64, error) {
-    id := uuid.New()
+    stmt := `INSERT INTO guestbook_comments (ShortId, GuestbookId, ParentId, AuthorName,
-    stmt := `INSERT INTO guestbook_comments (Id, GuestbookId, ParentId, AuthorName,
+    AuthorEmail, AuthorSite, CommentText, PageUrl, Created, IsPublished, IsDeleted)
-    AuthorEmail, AuthorSite, CommentText, PageUrl, IsPublished, IsDeleted)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, FALSE)`
-    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, FALSE)`
+    result, err := m.DB.Exec(stmt, shortId, guestbookId, parentId, authorName, authorEmail,
-    _, err := m.DB.Exec(stmt, id, guestbookId, parentId, authorName, authorEmail,
+	authorSite, commentText, pageUrl, time.Now().UTC(), isPublished)
-	authorSite, commentText, pageUrl, isPublished)
     if err != nil {
-	return uuid.UUID{}, err
+	return -1, err
+    }
+    id, err := result.LastInsertId()
+    if err != nil {
+	return -1, err
     }
     return id, nil
 }
 
-func (m *GuestbookCommentModel) Get(id uuid.UUID) (GuestbookComment, error) {
+func (m *GuestbookCommentModel) Get(shortId uint64) (GuestbookComment, error) {
-    stmt := `SELECT Id, GuestbookId, ParentId, AuthorName, AuthorEmail, AuthorSite,
+    stmt := `SELECT Id, ShortId, GuestbookId, ParentId, AuthorName, AuthorEmail, AuthorSite,
-    CommentText, PageUrl, IsPublished, IsDeleted FROM guestbook_comments WHERE id = ?`
+    CommentText, PageUrl, Created, IsPublished, IsDeleted FROM guestbook_comments WHERE ShortId = ?`
-    row := m.DB.QueryRow(stmt, id)
+    row := m.DB.QueryRow(stmt, shortId)
     var c GuestbookComment
-    err := row.Scan(&c.ID, &c.GuestbookId, &c.ParentId, &c.AuthorName, &c.AuthorEmail, &c.AuthorSite, &c.CommentText, &c.PageUrl, &c.IsPublished, &c.IsDeleted)
+    err := row.Scan(&c.ID, &c.ShortId, &c.GuestbookId, &c.ParentId, &c.AuthorName, &c.AuthorEmail, &c.AuthorSite, &c.CommentText, &c.PageUrl, &c.Created, &c.IsPublished, &c.IsDeleted)
     if err != nil {
 	return GuestbookComment{}, err
     }
     return c, nil
 }
 
-func (m *GuestbookCommentModel) GetAll(guestbookId uuid.UUID) ([]GuestbookComment, error) {
+func (m *GuestbookCommentModel) GetAll(guestbookId int64) ([]GuestbookComment, error) {
-    stmt := `SELECT Id, GuestbookId, ParentId, AuthorName, AuthorEmail, AuthorSite,
+    stmt := `SELECT Id, ShortId, GuestbookId, ParentId, AuthorName, AuthorEmail, AuthorSite,
-    CommentText, PageUrl, IsPublished, IsDeleted FROM guestbook_comments WHERE GuestbookId = ?`
+    CommentText, PageUrl, Created, IsPublished, IsDeleted FROM guestbook_comments WHERE GuestbookId = ? AND IsDeleted = FALSE ORDER BY Created DESC`
     rows, err := m.DB.Query(stmt, guestbookId)
     if err != nil {
 	return nil, err
@@ -59,7 +63,7 @@ func (m *GuestbookCommentModel) GetAll(guestbookId uuid.UUID) ([]GuestbookCommen
     var comments []GuestbookComment
     for rows.Next() {
 	var c GuestbookComment
-	err = rows.Scan(&c.ID, &c.GuestbookId, &c.ParentId, &c.AuthorName, &c.AuthorEmail, &c.AuthorSite, &c.CommentText, &c.PageUrl, &c.IsPublished, &c.IsDeleted)
+	err = rows.Scan(&c.ID, &c.ShortId, &c.GuestbookId, &c.ParentId, &c.AuthorName, &c.AuthorEmail, &c.AuthorSite, &c.CommentText, &c.PageUrl, &c.Created, &c.IsPublished, &c.IsDeleted)
 	if err != nil {
 	    return nil, err
 	}

internal/models/user.go

@@ -3,37 +3,66 @@ package models
 import (
 	"database/sql"
 	"errors"
+	"strings"
+	"time"
 
-    "github.com/google/uuid"
+	"github.com/mattn/go-sqlite3"
+	"golang.org/x/crypto/bcrypt"
 )
 
 type User struct {
-    ID uuid.UUID
+    ID int
+    ShortId uint64
     Username string
     Email string
     IsDeleted bool
+    IsBanned bool
+    HashedPassword []byte
+    Created time.Time
 }
 
 type UserModel struct {
     DB *sql.DB
 }
 
-func (m *UserModel) Insert(username string, email string) (uuid.UUID, error) {
+func (m *UserModel) Insert(shortId uint64, username string, email string, password string) error {
-    id := uuid.New()
+    hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 12)
-    stmt := `INSERT INTO users (Id, Username, Email, IsDeleted)
-    VALUES (?, ?, ?, FALSE)`
-    _, err := m.DB.Exec(stmt, id, username, email)
     if err != nil {
-	return uuid.UUID{}, err
+	return err
     }
-    return id, nil
+    stmt := `INSERT INTO users (ShortId, Username, Email, IsDeleted, IsBanned, HashedPassword, Created)
+    VALUES (?, ?, ?, FALSE, FALSE, ?, ?)`
+    _, err = m.DB.Exec(stmt, shortId, username, email, hashedPassword, time.Now().UTC())
+    if err != nil {
+	if sqliteError, ok := err.(sqlite3.Error); ok {
+	    if sqliteError.ExtendedCode == 2067 && strings.Contains(sqliteError.Error(), "Email") {
+		return ErrDuplicateEmail
+	    }
+	}
+	return err
+    }
+    return nil
 }
 
-func (m *UserModel) Get(id uuid.UUID) (User, error) {
+func (m *UserModel) Get(id uint64) (User, error) {
-    stmt := `SELECT Id, Username, Email, IsDeleted FROM users WHERE id = ?`
+    stmt := `SELECT Id, ShortId, Username, Email, Created FROM users WHERE ShortId = ? AND IsDeleted = FALSE`
     row := m.DB.QueryRow(stmt, id)
     var u User
-    err := row.Scan(&u.ID, &u.Username, &u.Email, &u.IsDeleted)
+    err := row.Scan(&u.ID, &u.ShortId, &u.Username, &u.Email, &u.Created)
+    if err != nil {
+	if errors.Is(err, sql.ErrNoRows) {
+	    return User{}, ErrNoRecord
+	}
+	return User{}, err
+    }
+    return u, nil
+}
+
+func (m *UserModel) GetById(id int64) (User, error) {
+    stmt := `SELECT Id, ShortId, Username, Email, Created FROM users WHERE Id = ? AND IsDeleted = FALSE`
+    row := m.DB.QueryRow(stmt, id)
+    var u User
+    err := row.Scan(&u.ID, &u.ShortId, &u.Username, &u.Email, &u.Created)
     if err != nil {
 	if errors.Is(err, sql.ErrNoRows) {
 	    return User{}, ErrNoRecord
@@ -44,12 +73,12 @@ func (m *UserModel) Get(id uuid.UUID) (User, error) {
 }
 
 func (m *UserModel) GetAll() ([]User, error) {
-    stmt := `SELECT Id, Username, Email, IsDeleted FROM users`
+    stmt := `SELECT Id, ShortId, Username, Email, Created FROM users WHERE IsDeleted = FALSE`
     rows, err := m.DB.Query(stmt)
     var users []User
     for rows.Next() {
 	var u User
-	err = rows.Scan(&u.ID, &u.Username, &u.Email, &u.IsDeleted)
+	err = rows.Scan(&u.ID, &u.ShortId, &u.Username, &u.Email, &u.Created)
 	if err != nil {
 	    return nil, err
 	}
@@ -60,3 +89,36 @@ func (m *UserModel) GetAll() ([]User, error) {
     }
     return users, nil
 }
+
+func (m *UserModel) Authenticate(email, password string) (int64, error) {
+    var id int64
+    var hashedPassword []byte
+
+    stmt := `SELECT Id, HashedPassword FROM users WHERE Email = ?`
+    err := m.DB.QueryRow(stmt, email).Scan(&id, &hashedPassword)
+    if err != nil {
+	if errors.Is(err, sql.ErrNoRows) {
+	    return 0, ErrInvalidCredentials
+	} else {
+	    return 0, err
+	}
+    }
+
+    err = bcrypt.CompareHashAndPassword(hashedPassword, []byte(password))
+    if err != nil {
+	if errors.Is(err, bcrypt.ErrMismatchedHashAndPassword) {
+	    return 0, ErrInvalidCredentials
+	} else {
+	    return 0, err
+	}
+    }
+
+    return id, nil
+}
+
+func (m *UserModel) Exists(id int64) (bool, error) {
+    var exists bool
+    stmt := `SELECT EXISTS(SELECT true FROM users WHERE Id = ? AND IsDeleted = False)`
+    err := m.DB.QueryRow(stmt, id).Scan(&exists)
+    return exists, err
+}

internal/validator/validator.go

@@ -1,17 +1,21 @@
 package validator
 
 import (
+	"regexp"
 	"slices"
 	"strings"
 	"unicode/utf8"
 )
 
+var EmailRX = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
+
 type Validator struct {
+    NonFieldErrors []string
     FieldErrors map[string]string
 }
 
 func (v *Validator) Valid() bool {
-    return len(v.FieldErrors) == 0
+    return len(v.FieldErrors) == 0 && len(v.NonFieldErrors) == 0
 }
 
 func (v *Validator) AddFieldError(key, message string) {
@@ -23,6 +27,10 @@ func (v *Validator) AddFieldError(key, message string) {
     }
 }
 
+func (v *Validator) AddNonFieldError(message string) {
+    v.NonFieldErrors = append(v.NonFieldErrors, message)
+}
+
 func (v *Validator) CheckField(ok bool, key, message string) {
     if !ok {
         v.AddFieldError(key, message)
@@ -40,3 +48,11 @@ func MaxChars(value string, n int) bool {
 func PermittedValue[T comparable](value T, permittedValues ...T) bool {
     return slices.Contains(permittedValues, value)
 }
+
+func MinChars(value string, n int) bool {
+    return utf8.RuneCountInString(value) >= n
+}
+
+func Matches(value string, rx *regexp.Regexp) bool {
+    return rx.MatchString(value)
+}

ui/html/base.tmpl.html

@@ -19,7 +19,7 @@
             {{ template "main" . }}
         </main>
         <footer>
-            <p>A 32-bit Cafe Project</p>
+            <p>A 32bit.cafe Project</p>
         </footer>
     </body>
 </html>

ui/html/pages/commentcreate.view.tmpl.html

@@ -1,14 +1,36 @@
 {{ define "title" }}New Comment{{ end }}
 {{ define "main" }}
-<form action="/guestbooks/{{ encodeId .Guestbook.ID }}/comments/create" method="post">
+<form action="/guestbooks/{{ shortIdToSlug .Guestbook.ShortId }}/comments/create" method="post">
+    <div>
         <label for="authorname">Name: </label>
+        {{ with .Form.FieldErrors.authorName }}
+            <label class="error">{{.}}</label>
+        {{ end }}
         <input type="text" name="authorname" id="authorname" >
+    </div>
+    <div>
         <label for="authoremail">Email: </label>
+        {{ with .Form.FieldErrors.authorEmail }}
+            <label class="error">{{.}}</label>
+        {{ end }}
         <input type="text" name="authoremail" id="authoremail" >
+    </div>
+    <div>
         <label for="authorsite">Site Url: </label>
-    <input type="text" name="authortext" id="authortext" >
+        {{ with .Form.FieldErrors.authorSite }}
+            <label class="error">{{.}}</label>
+        {{ end }}
+        <input type="text" name="authorsite" id="authorsite" >
+    </div>
+    <div>
         <label for="content">Comment: </label>
+        {{ with .Form.FieldErrors.content }}
+            <label class="error">{{.}}</label>
+        {{ end }}
         <textarea name="content" id="content"></textarea>
+    </div>
+    <div>
         <input type="submit" value="Post">
+    </div>
 </form>
 {{ end }}

ui/html/pages/guestbook.view.tmpl.html

@@ -1,12 +1,18 @@
 {{ define "title" }} Guestbook View {{ end }}
 {{ define "main" }}
 <h1>Guestbook for {{ .Guestbook.SiteUrl }}</h1>
-<a href="/guestbooks/{{ encodeId .Guestbook.ID }}/comments/create">New Comment</a>
+<p>
-<ul>
+    <a href="/guestbooks/{{ shortIdToSlug .Guestbook.ShortId }}/comments/create">New Comment</a>
+</p>
 {{ range .Comments }}
-<li> {{ .CommentText }} </li>
+    <div>
+        <strong> {{ .AuthorName }} </strong>
+        {{ .Created.Local.Format "01-02-2006 03:04PM" }}
+        <p>
+            {{ .CommentText }}
+        </p>
+    </div>
 {{ else }}
-</ul>
 <p>No comments yet!</p>
 {{ end }}
 {{ end }}

ui/html/pages/guestbookcreate.view.tmpl.html

@@ -1,6 +1,7 @@
 {{ define "title" }}Create a Guestbook{{ end }}
 {{ define "main" }}
 <form action="/guestbooks/create" method="post">
+    <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
     <label for="siteurl">Site URL: </label>
     <input type="text" name="siteurl" id="siteurl" required />
     <input type="submit" />

ui/html/pages/guestbooklist.view.tmpl.html

@@ -1,9 +1,9 @@
 {{ define "title" }} Guestbooks  {{ end }}
 {{ define "main" }}
-<h1>Guestbooks run by ---</h1>
+<h1>Guestbooks run by {{ .User.Username }}</h1>
 <ul>
     {{ range .Guestbooks }}
-    <li><a href="/guestbooks/{{ encodeId .ID }}">{{ with .SiteUrl }}{{ . }}{{ else }}Untitled{{ end }}</a></li>
+    <li><a href="/guestbooks/{{ shortIdToSlug .ShortId }}">{{ with .SiteUrl }}{{ . }}{{ else }}Untitled{{ end }}</a></li>
     {{ else }}
     <p>No Guestbooks yet</p>
     {{ end }}

ui/html/pages/login.view.tmpl.html

@@ -0,0 +1,26 @@
+{{define "title"}}Login{{end}}
+{{define "main"}}
+<form action="/users/login" method="POST" novalidate>
+    <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+    {{ range .Form.NonFieldErrors }}
+        <div class="error">{{.}}</div>
+    {{ end }}
+    <div>
+        <label>Email: </label>
+        {{ with .Form.FieldErrors.email }}
+            <label class="error">{{.}}</label>
+        {{ end }}
+        <input type="email" name="email" value="{{.Form.Email}}">
+    </div>
+    <div>
+        <label>Password: </label>
+        {{ with .Form.FieldErrors.password }}
+            <label class="error">{{.}}</label>
+        {{ end }}
+        <input type="password" name="password">
+    </div>
+    <div>
+        <input type="submit" value="login">
+    </div>
+</form>
+{{end}}

ui/html/pages/usercreate.view.tmpl.html

@@ -1,10 +1,30 @@
 {{ define "title" }}User Registration{{ end }}
 {{ define "main" }}
 <form action="/users/register" method="post">
+    <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+    <div>
         <label for="username">Username: </label>
-    <input type="text" name="username" id="username" required />
+        {{ with .Form.FieldErrors.name }}
+            <label class="error">{{.}}</label>
+        {{ end }}
+        <input type="text" name="username" id="username" value="{{ .Form.Name }}" required />
+    </div>
+    <div>
         <label for="email">Email: </label>
-    <input type="text" name="email" id="email" required />
+        {{ with .Form.FieldErrors.email }}
-    <input type="submit" />
+            <label class="error">{{.}}</label>
+        {{ end }}
+        <input type="text" name="email" id="email" value="{{ .Form.Email }}" required />
+    </div>
+    <div>
+        <label for="password">Password: </label>
+        {{ with .Form.FieldErrors.password }}
+            <label class="error">{{.}}</label>
+        {{ end }}
+        <input type="password" name="password" id="password" />
+    </div>
+    <div>
+        <input type="submit" value="Register"/>
+    </div> 
 </form>
 {{ end }}

ui/html/pages/userlist.view.tmpl.html

@@ -3,7 +3,7 @@
     <h1>Users</h1>
     {{ range .Users }}
         <p>
-        <a href="/users/{{ encodeId .ID }}">{{ .Username }}</a>
+        <a href="/users/{{ shortIdToSlug .ShortId }}">{{ .Username }}</a>
         </p>
     {{ end }}
 {{ end }}

ui/html/partials/nav.tmpl.html

@@ -1,7 +1,22 @@
 {{ define "nav" }}
 <nav>
+    <div>
     <a href="/">Home</a>
-    <a href="/users/register">Register</a>
     <a href="/users">Users</a>
+    </div>
+    <div>
+        {{ if .IsAuthenticated }}
+            {{ with .User }}
+                <a href="/users/{{ .User.ShortId }}">{{ .User.Username }}</a>
+            {{ end }}
+            <form action="/users/logout" method="post">
+                <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+                <button>Logout</button>
+            </form>
+        {{ else }}
+            <a href="/users/register">Register</a>
+            <a href="/users/login">Login</a>
+        {{ end }}
+    </div>
 </nav>
 {{ end }}