create and retrieve handlers, basic templates and styling, sessions

.gitignore

@@ -23,3 +23,7 @@ go.work
 
 # sqlite3 databases
 *.db
+
+# air config
+.air.toml
+/tmp

cmd/web/handlers.go

@@ -1,30 +1,222 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"net/http"
+	"strings"
+	"unicode/utf8"
+
+	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
+	"github.com/google/uuid"
 )
 
 func (app *application) home(w http.ResponseWriter, r *http.Request) {
     app.render(w, r, http.StatusOK, "home.tmpl.html", templateData{})
 }
 
-func getUserRegister(w http.ResponseWriter, r *http.Request) {
+func (app *application) getUserRegister(w http.ResponseWriter, r *http.Request) {
+    app.render(w, r, http.StatusOK, "usercreate.view.tmpl.html", templateData{})
 }
 
-func postUserRegister(w http.ResponseWriter, r *http.Request) {
+func (app *application) postUserRegister(w http.ResponseWriter, r *http.Request) {
+    err := r.ParseForm()
+    if err != nil {
+        app.serverError(w, r, err)
+    }
+    username := r.Form.Get("username")
+    email := r.Form.Get("email")
+    rawid, err := app.users.Insert(username, email)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    id, err := encodeIdB64(rawid)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    http.Redirect(w, r, fmt.Sprintf("/users/%s", id), http.StatusSeeOther)
 }
 
-func getUsersList(w http.ResponseWriter, r *http.Request) {
+func (app *application) getUsersList(w http.ResponseWriter, r *http.Request) {
+    users, err := app.users.GetAll()
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    app.render(w, r, http.StatusOK, "userlist.view.tmpl.html", templateData{
+        Users: users,
+    })
 }
 
-func getUser(w http.ResponseWriter, r *http.Request) {
+func (app *application) getUser(w http.ResponseWriter, r *http.Request) {
+    rawid := r.PathValue("id") 
+    id, err := decodeIdB64(rawid)
+    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)
+        } else {
+            app.serverError(w, r, err)
+        }
+        return
+    }
+    app.render(w, r, http.StatusOK, "user.view.tmpl.html", templateData{
+        User: user,
+    })
 }
 
-func postGuestbooksCreate(w http.ResponseWriter, r* http.Request) {
+func (app *application) getGuestbookCreate(w http.ResponseWriter, r* http.Request) {
+    app.render(w, r, http.StatusOK, "guestbookcreate.view.tmpl.html", templateData{})
 }
 
-func getGuestbooksList(w http.ResponseWriter, r *http.Request) {
+func (app *application) postGuestbookCreate(w http.ResponseWriter, r* http.Request) {
+    err := r.ParseForm()
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    siteUrl := r.Form.Get("siteurl")
+    app.logger.Debug("creating guestbook for site", "siteurl", siteUrl)
+    userId := getUserId()
+    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)
 }
 
-func getGuestbook(w http.ResponseWriter, r *http.Request) {
+func (app *application) getGuestbookList(w http.ResponseWriter, r *http.Request) {
+    userId := getUserId()
+    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{
+        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)
+    if err != nil {
+        if errors.Is(err, models.ErrNoRecord) {
+            http.NotFound(w, r)
+        } else {
+            app.serverError(w, r, err)
+        }
+        return
+    }
+    comments, err := app.guestbookComments.GetAll(id)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    data := app.newTemplateData(r)
+    data.Guestbook = guestbook
+    data.Comments = comments
+    app.render(w, r, http.StatusOK, "guestbook.view.tmpl.html", data)
+}
+
+func (app *application) getGuestbookComments(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)
+    if err != nil {
+        if errors.Is(err, models.ErrNoRecord) {
+            http.NotFound(w, r)
+        } else {
+            app.serverError(w, r, err)
+        }
+        return
+    }
+    comments, err := app.guestbookComments.GetAll(id)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    app.render(w, r, http.StatusOK, "commentlist.view.tmpl.html", templateData{
+        Guestbook: guestbook,
+        Comments: comments,
+    })
+}
+
+func (app *application) getGuestbookCommentCreate(w http.ResponseWriter, r *http.Request) {
+    rawId := r.PathValue("id")
+    id, err := decodeIdB64(rawId)
+    if err != nil {
+        http.NotFound(w, r)
+    }
+    app.render(w, r, http.StatusOK, "commentcreate.view.tmpl.html", templateData{
+        Guestbook: models.Guestbook{
+            ID: id,
+        },
+    })
+}
+
+func (app *application) postGuestbookCommentCreate(w http.ResponseWriter, r *http.Request) {
+    rawGbId := r.PathValue("id")
+    gbId, err := decodeIdB64(rawGbId)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    err = r.ParseForm()
+    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)
+    if strings.TrimSpace(authorName) == "" {
+        fieldErrors["title"] = "This field cannot be blank"
+    } else if utf8.RuneCountInString(authorName) > 256 {
+        fieldErrors["title"] = "This field cannot be more than 256 characters long"
+    }
+    if strings.TrimSpace(content) == "" {
+        fieldErrors["content"] = "This field cannot be blank"
+    }
+    if len(fieldErrors) > 0 {
+        fmt.Fprint(w, fieldErrors)
+        return
+    }
+    
+    commentId, err := app.guestbookComments.Insert(gbId, uuid.UUID{}, authorName, authorEmail, authorSite, content, "", true)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    _, err = encodeIdB64(commentId)
+    if err != nil {
+        app.serverError(w, r, err)
+        return
+    }
+    http.Redirect(w, r, fmt.Sprintf("/guestbooks/%s", rawGbId), http.StatusSeeOther)
 }

cmd/web/helpers.go

@@ -1,8 +1,11 @@
 package main
 
 import (
-    "net/http"
+	"encoding/base64"
 	"fmt"
+	"net/http"
+
+	"github.com/google/uuid"
 )
 
 func (app *application) serverError(w http.ResponseWriter, r *http.Request, err error) {
@@ -33,3 +36,25 @@ func (app *application) render(w http.ResponseWriter, r *http.Request, status in
         app.serverError(w, r, err)
     }
 }
+
+func encodeIdB64 (id uuid.UUID) (string, error) {
+    b, err := id.MarshalBinary()
+    if err != nil {
+        return "", err
+    }
+    s := base64.RawURLEncoding.EncodeToString(b)
+    return s, nil
+}
+
+func decodeIdB64 (id string) (uuid.UUID, error) {
+    b, err := base64.RawURLEncoding.DecodeString(id)
+    var u uuid.UUID
+    if err != nil {
+        return u, err
+    }
+    err = u.UnmarshalBinary(b)
+    if err != nil {
+        return u, err
+    }
+    return u, nil
+}

cmd/web/main.go

@@ -7,9 +7,13 @@ import (
 	"net/http"
 	"os"
 	"text/template"
+	"time"
 
 	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
-	_ "modernc.org/sqlite"
+	"github.com/alexedwards/scs/sqlite3store"
+	"github.com/alexedwards/scs/v2"
+	"github.com/google/uuid"
+	_ "github.com/mattn/go-sqlite3"
 )
 
 type application struct {
@@ -18,6 +22,7 @@ type application struct {
     guestbooks *models.GuestbookModel
     users *models.UserModel
     guestbookComments *models.GuestbookCommentModel
+    sessionManager *scs.SessionManager
 }
 
 func main() {
@@ -25,7 +30,7 @@ func main() {
     dsn := flag.String("dsn", "guestbook.db", "data source name")
     flag.Parse()
 
-    logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
+    logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelDebug}))
 
     db, err := openDB(*dsn)
     if err != nil {
@@ -40,15 +45,20 @@ func main() {
         os.Exit(1)
     }
 
+    sessionManager := scs.New()
+    sessionManager.Store = sqlite3store.New(db)
+    sessionManager.Lifetime = 12 * time.Hour
+
     app := &application{
         templateCache: templateCache,
         logger: logger,
+        sessionManager: sessionManager,
         guestbooks: &models.GuestbookModel{DB: db},
         users: &models.UserModel{DB: db},
         guestbookComments: &models.GuestbookCommentModel{DB: db},
     }
 
-    logger.Info("Starting server on %s", slog.Any("addr", ":4000"))
+    logger.Info("Starting server", slog.Any("addr", *addr))
 
     err = http.ListenAndServe(*addr, app.routes());
     logger.Error(err.Error())
@@ -56,7 +66,7 @@ func main() {
 }
 
 func openDB(dsn string) (*sql.DB, error) {
-    db, err := sql.Open("sqlite", dsn)
+    db, err := sql.Open("sqlite3", dsn)
     if err != nil {
         return nil, err
     }
@@ -65,3 +75,8 @@ func openDB(dsn string) (*sql.DB, error) {
     }
     return db, nil
 }
+
+func getUserId() uuid.UUID {
+    userId, _ := decodeIdB64("laINnbnkTtyN5SYoCfSbXw")
+    return userId
+}

cmd/web/middleware.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func (app *application) logRequest (next http.Handler) http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        var (
+            ip = r.RemoteAddr
+            proto = r.Proto
+            method = r.Method
+            uri = r.URL.RequestURI()
+        )
+        app.logger.Info("received request", "ip", ip, "proto", proto, "method", method, "uri", uri)
+        next.ServeHTTP(w, r)
+    })
+}
+
+func commonHeaders (next http.Handler) http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        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-XSS-Protection", "0")
+        next.ServeHTTP(w, r)
+    })
+}
+
+func (app *application) recoverPanic(next http.Handler) http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        defer func() {
+            if err := recover(); err != nil {
+                w.Header().Set("Connection", "close")
+                app.serverError(w, r, fmt.Errorf("%s", err))
+            }
+        }()
+
+        next.ServeHTTP(w, r)
+    })
+}

cmd/web/routes.go

@@ -4,9 +4,22 @@ import (
     "net/http"
 )
 
-func (app *application) routes() *http.ServeMux {
+func (app *application) routes() http.Handler {
     mux := http.NewServeMux()
-    mux.HandleFunc("/", app.home);
-    return mux
+    fileServer := http.FileServer(http.Dir("./ui/static"))
+    mux.Handle("GET /static/", http.StripPrefix("/static", fileServer))
+
+    mux.Handle("/{$}", app.sessionManager.LoadAndSave(http.HandlerFunc(app.home)))
+    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("GET /users/register", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getUserRegister)))
+    mux.Handle("POST /users/register", app.sessionManager.LoadAndSave(http.HandlerFunc(app.postUserRegister)))
+    mux.Handle("GET /guestbooks", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbookList)))
+    mux.Handle("GET /guestbooks/{id}", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbook)))
+    mux.Handle("GET /guestbooks/create", app.sessionManager.LoadAndSave(http.HandlerFunc(app.getGuestbookCreate)))
+    mux.Handle("POST /guestbooks/create", app.sessionManager.LoadAndSave(http.HandlerFunc(app.postGuestbookCreate)))
+    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)))
+    return app.recoverPanic(app.logRequest(commonHeaders(mux)))
 }
 

cmd/web/templates.go

@@ -5,10 +5,19 @@ import (
 	"path/filepath"
 	"text/template"
 	"time"
+
+	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
 )
 
 type templateData struct {
     CurrentYear int
+    User models.User
+    Users []models.User
+    Guestbook models.Guestbook
+    Guestbooks []models.Guestbook
+    Comment models.GuestbookComment
+    Comments []models.GuestbookComment
+    Flash string
 }
 
 func humanDate(t time.Time) string {
@@ -17,6 +26,8 @@ func humanDate(t time.Time) string {
 
 var functions = template.FuncMap {
     "humanDate": humanDate,
+    "encodeId": encodeIdB64,
+    "decodeId": decodeIdB64,
 }
 
 func newTemplateCache() (map[string]*template.Template, error) {
@@ -44,8 +55,9 @@ func newTemplateCache() (map[string]*template.Template, error) {
     return cache, nil
 }
 
-func (app *application) newTemplateData(r *http.Request) *templateData {
-    return &templateData {
+func (app *application) newTemplateData(r *http.Request) templateData {
+    return templateData {
         CurrentYear: time.Now().Year(),
+        Flash: app.sessionManager.PopString(r.Context(), "flash"),
     }
 }

db/create-session-table-sqlite.sql

@@ -0,0 +1,5 @@
+CREATE TABLE sessions (
+    token CHAR(43) primary key,
+    data BLOB NOT NULL,
+    expiry TEXT NOT NULL
+);

go.mod

@@ -3,18 +3,8 @@ module git.32bit.cafe/32bitcafe/guestbook
 go 1.23.1
 
 require (
-	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
-	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/ncruces/go-strftime v0.1.9 // indirect
-	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
-	golang.org/x/sys v0.22.0 // indirect
-	modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 // indirect
-	modernc.org/libc v1.55.3 // indirect
-	modernc.org/mathutil v1.6.0 // indirect
-	modernc.org/memory v1.8.0 // indirect
-	modernc.org/sqlite v1.33.1 // indirect
-	modernc.org/strutil v1.2.0 // indirect
-	modernc.org/token v1.1.0 // indirect
+	github.com/alexedwards/scs/sqlite3store v0.0.0-20240316134038-7e11d57e8885
+	github.com/alexedwards/scs/v2 v2.8.0
+	github.com/google/uuid v1.6.0
+	github.com/mattn/go-sqlite3 v1.14.6
 )

go.sum

@@ -1,29 +1,8 @@
-github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
-github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/alexedwards/scs/sqlite3store v0.0.0-20240316134038-7e11d57e8885 h1:+DCxWg/ojncqS+TGAuRUoV7OfG/S4doh0pcpAwEcow0=
+github.com/alexedwards/scs/sqlite3store v0.0.0-20240316134038-7e11d57e8885/go.mod h1:Iyk7S76cxGaiEX/mSYmTZzYehp4KfyylcLaV3OnToss=
+github.com/alexedwards/scs/v2 v2.8.0 h1:h31yUYoycPuL0zt14c0gd+oqxfRwIj6SOjHdKRZxhEw=
+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/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
-github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
-github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
-github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
-github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
-golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 h1:5D53IMaUuA5InSeMu9eJtlQXS2NxAhyWQvkKEgXZhHI=
-modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6/go.mod h1:Qz0X07sNOR1jWYCrJMEnbW/X55x206Q7Vt4mz6/wHp4=
-modernc.org/libc v1.55.3 h1:AzcW1mhlPNrRtjS5sS+eW2ISCgSOLLNyFzRh/V3Qj/U=
-modernc.org/libc v1.55.3/go.mod h1:qFXepLhz+JjFThQ4kzwzOjA/y/artDeg+pcYnY+Q83w=
-modernc.org/mathutil v1.6.0 h1:fRe9+AmYlaej+64JsEEhoWuAYBkOtQiMEU7n/XgfYi4=
-modernc.org/mathutil v1.6.0/go.mod h1:Ui5Q9q1TR2gFm0AQRqQUaBWFLAhQpCwNcuhBOSedWPo=
-modernc.org/memory v1.8.0 h1:IqGTL6eFMaDZZhEWwcREgeMXYwmW83LYW8cROZYkg+E=
-modernc.org/memory v1.8.0/go.mod h1:XPZ936zp5OMKGWPqbD3JShgd/ZoQ7899TUuQqxY+peU=
-modernc.org/sqlite v1.33.1 h1:trb6Z3YYoeM9eDL1O8do81kP+0ejv+YzgyFo+Gwy0nM=
-modernc.org/sqlite v1.33.1/go.mod h1:pXV2xHxhzXZsgT/RtTFAPY6JJDEvOTcTdwADQCCWD4k=
-modernc.org/strutil v1.2.0 h1:agBi9dp1I+eOnxXeiZawM8F4LawKv4NzGWSaLfyeNZA=
-modernc.org/strutil v1.2.0/go.mod h1:/mdcBmfOibveCTBxUl5B5l6W+TTH1FXPLHZE6bTosX0=
-modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
-modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
+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=

internal/models/errors.go

@@ -0,0 +1,5 @@
+package models
+
+import "errors"
+
+var ErrNoRecord = errors.New("models: no matching record found")

internal/models/guestbook.go

@@ -21,7 +21,7 @@ type GuestbookModel struct {
 func (m *GuestbookModel) Insert(siteUrl string, userId uuid.UUID) (uuid.UUID, error) {
     id := uuid.New()
     stmt := `INSERT INTO guestbooks (Id, SiteUrl, UserId, IsDeleted, IsActive)
-    VALUES(?, ?, FALSE, TRUE)`
+    VALUES(?, ?, ?, FALSE, TRUE)`
     _, err := m.DB.Exec(stmt, id, siteUrl, userId)
     if err != nil {
         return uuid.UUID{}, err
@@ -43,5 +43,23 @@ func (m *GuestbookModel) Get(id uuid.UUID) (Guestbook, error) {
 }
 
 func (m *GuestbookModel) GetAll(userId uuid.UUID) ([]Guestbook, error) {
-    return []Guestbook{}, nil
+    stmt := `SELECT Id, SiteUrl, UserId, IsDeleted, IsActive FROM guestbooks
+    WHERE UserId = ?`
+    rows, err := m.DB.Query(stmt, userId)
+    if err != nil {
+        return nil, err
+    }
+    var guestbooks []Guestbook
+    for rows.Next() {
+        var g Guestbook
+        err = rows.Scan(&g.ID, &g.SiteUrl, &g.UserId, &g.IsDeleted, &g.IsActive)
+        if err != nil {
+            return nil, err
+        }
+        guestbooks = append(guestbooks, g)
+    }
+    if err = rows.Err(); err != nil {
+        return nil, err
+    }
+    return guestbooks, nil
 }

internal/models/guestbookcomment.go

@@ -49,5 +49,24 @@ func (m *GuestbookCommentModel) Get(id uuid.UUID) (GuestbookComment, error) {
     return c, nil
 }
 
-func (m *GuestbookCommentModel) GetAll(guestbookId *uuid.UUID) {
+func (m *GuestbookCommentModel) GetAll(guestbookId uuid.UUID) ([]GuestbookComment, error) {
+    stmt := `SELECT Id, GuestbookId, ParentId, AuthorName, AuthorEmail, AuthorSite,
+    CommentText, PageUrl, IsPublished, IsDeleted FROM guestbook_comments WHERE GuestbookId = ?`
+    rows, err := m.DB.Query(stmt, guestbookId)
+    if err != nil {
+	return nil, err
+    }
+    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)
+	if err != nil {
+	    return nil, err
+	}
+	comments = append(comments, c)
+    }
+    if err = rows.Err(); err != nil {
+	return nil, err
+    }
+    return comments, nil
 }

internal/models/user.go

@@ -2,6 +2,7 @@ package models
 
 import (
     "database/sql"
+    "errors"
 
     "github.com/google/uuid"
 )
@@ -34,7 +35,28 @@ func (m *UserModel) Get(id uuid.UUID) (User, error) {
     var u User
     err := row.Scan(&u.ID, &u.Username, &u.Email, &u.IsDeleted)
     if err != nil {
+	if errors.Is(err, sql.ErrNoRows) {
+	    return User{}, ErrNoRecord
+	}
 	return User{}, err
     }
     return u, nil
 }
+
+func (m *UserModel) GetAll() ([]User, error) {
+    stmt := `SELECT Id, Username, Email, IsDeleted FROM users`
+    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)
+	if err != nil {
+	    return nil, err
+	}
+	users = append(users, u)
+    }
+    if err = rows.Err(); err != nil {
+	return nil, err
+    }
+    return users, nil
+}

internal/validator/validator.go

@@ -0,0 +1,42 @@
+package validator
+
+import (
+	"slices"
+	"strings"
+	"unicode/utf8"
+)
+
+type Validator struct {
+    FieldErrors map[string]string
+}
+
+func (v *Validator) Valid() bool {
+    return len(v.FieldErrors) == 0
+}
+
+func (v *Validator) AddFieldError(key, message string) {
+    if v.FieldErrors == nil {
+        v.FieldErrors = make(map[string]string)
+    }
+    if _, exists := v.FieldErrors[key]; !exists {
+        v.FieldErrors[key] = message
+    }
+}
+
+func (v *Validator) CheckField(ok bool, key, message string) {
+    if !ok {
+        v.AddFieldError(key, message)
+    }
+}
+
+func NotBlank(value string) bool {
+    return strings.TrimSpace(value) != ""
+}
+
+func MaxChars(value string, n int) bool {
+    return utf8.RuneCountInString(value) <= n
+}
+
+func PermittedValue[T comparable](value T, permittedValues ...T) bool {
+    return slices.Contains(permittedValues, value)
+}

ui/html/base.tmpl.html

@@ -5,7 +5,7 @@
         <title>{{ template "title" }} - Guestbook</title>
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width, initial-scale=1">
-        <link href="css/style.css" rel="stylesheet">
+        <link href="/static/css/style.css" rel="stylesheet">
     </head>
     <body>
         <header>
@@ -13,6 +13,9 @@
         </header>
         {{ template "nav" . }}
         <main>
+            {{ with .Flash }}
+                <div class="flash">{{ . }}</div>
+            {{ end }}
             {{ template "main" . }}
         </main>
         <footer>

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

@@ -0,0 +1,14 @@
+{{ define "title" }}New Comment{{ end }}
+{{ define "main" }}
+<form action="/guestbooks/{{ encodeId .Guestbook.ID }}/comments/create" method="post">
+    <label for="authorname">Name: </label>
+    <input type="text" name="authorname" id="authorname" >
+    <label for="authoremail">Email: </label>
+    <input type="text" name="authoremail" id="authoremail" >
+    <label for="authorsite">Site Url: </label>
+    <input type="text" name="authortext" id="authortext" >
+    <label for="content">Comment: </label>
+    <textarea name="content" id="content"></textarea>
+    <input type="submit" value="Post">
+</form>
+{{ end }}

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

@@ -0,0 +1,12 @@
+{{ define "title" }} Guestbook View {{ end }}
+{{ define "main" }}
+<h1>Guestbook for {{ .Guestbook.SiteUrl }}</h1>
+<a href="/guestbooks/{{ encodeId .Guestbook.ID }}/comments/create">New Comment</a>
+<ul>
+{{ range .Comments }}
+<li> {{ .CommentText }} </li>
+{{ else }}
+</ul>
+<p>No comments yet!</p>
+{{ end }}
+{{ end }}

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

@@ -0,0 +1,8 @@
+{{ define "title" }}Create a Guestbook{{ end }}
+{{ define "main" }}
+<form action="/guestbooks/create" method="post">
+    <label for="siteurl">Site URL: </label>
+    <input type="text" name="siteurl" id="siteurl" required />
+    <input type="submit" />
+</form>
+{{ end }}

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

@@ -0,0 +1,11 @@
+{{ define "title" }} Guestbooks  {{ end }}
+{{ define "main" }}
+<h1>Guestbooks run by ---</h1>
+<ul>
+    {{ range .Guestbooks }}
+    <li><a href="/guestbooks/{{ encodeId .ID }}">{{ with .SiteUrl }}{{ . }}{{ else }}Untitled{{ end }}</a></li>
+    {{ else }}
+    <p>No Guestbooks yet</p>
+    {{ end }}
+</ul>
+{{ end }}

ui/html/pages/home.tmpl.html

@@ -1,5 +1,10 @@
 {{ define "title" }}Home{{ end }}
 {{ define "main" }}
 <h2>Latest Guestbooks</h2>
-<p>There's nothing here yet</p>
+<p>
+    <a href="/guestbooks">View Guestbooks</a>
+</p>
+<p>
+    <a href="/guestbooks/create">Create a Guestbook</a>
+</p>
 {{ end }}

ui/html/pages/user.view.tmpl.html

@@ -0,0 +1,5 @@
+{{ define "title" }}{{ .User.Username }}{{ end }}
+{{ define "main" }}
+<h1>{{ .User.Username }}</h1>
+<p>{{ .User.Email }}</p>
+{{ end }}

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

@@ -0,0 +1,10 @@
+{{ define "title" }}User Registration{{ end }}
+{{ define "main" }}
+<form action="/users/register" method="post">
+    <label for="username">Username: </label>
+    <input type="text" name="username" id="username" required />
+    <label for="email">Email: </label>
+    <input type="text" name="email" id="email" required />
+    <input type="submit" />
+</form>
+{{ end }}

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

@@ -0,0 +1,9 @@
+{{ define "title" }}Users{{ end }}
+{{ define "main" }}
+    <h1>Users</h1>
+    {{ range .Users }}
+        <p>
+        <a href="/users/{{ encodeId .ID }}">{{ .Username }}</a>
+        </p>
+    {{ end }}
+{{ end }}

ui/html/partials/nav.tmpl.html

@@ -1,5 +1,7 @@
 {{ define "nav" }}
 <nav>
     <a href="/">Home</a>
+    <a href="/users/register">Register</a>
+    <a href="/users">Users</a>
 </nav>
 {{ end }}

ui/static/css/style.css

@@ -0,0 +1,511 @@
+/* Set the global variables for everything. Change these to use your own fonts and colours. */
+:root {
+  /* Set sans-serif & mono fonts */
+  --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir,
+    "Nimbus Sans L", Roboto, Noto, "Segoe UI", Arial, Helvetica,
+    "Helvetica Neue", sans-serif;
+  --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
+
+  /* Body font size. By default, effectively 18.4px, based on 16px as 'root em' */
+  --base-fontsize: 1.15rem;
+
+  /* Major third scale progression - see https://type-scale.com/ */
+  --header-scale: 1.25;
+
+  /* Line height is set to the "Golden ratio" for optimal legibility */
+  --line-height: 1.618;
+
+  /* Default (light) theme */
+  --bg: #fff;
+  --accent-bg: #f5f7ff;
+  --text: #212121;
+  --text-light: #585858;
+  --border: #d8dae1;
+  --accent: #0d47a1;
+  --accent-light: #90caf9;
+  --code: #d81b60;
+  --preformatted: #444;
+  --marked: #ffdd33;
+  --disabled: #efefef;
+}
+
+/* Dark theme */
+@media (prefers-color-scheme: dark) {
+  :root {
+    --bg: #212121;
+    --accent-bg: #2b2b2b;
+    --text: #dcdcdc;
+    --text-light: #ababab;
+    --border: #666;
+    --accent: #ffb300;
+    --accent-light: #ffecb3;
+    --code: #f06292;
+    --preformatted: #ccc;
+    --disabled: #111;
+  }
+
+  img,
+  video {
+    opacity: 0.6;
+  }
+}
+
+html {
+  /* Set the font globally */
+  font-family: var(--sans-font);
+}
+
+/* Make the body a nice central block */
+body {
+  color: var(--text);
+  background: var(--bg);
+  font-size: var(--base-fontsize);
+  line-height: var(--line-height);
+  display: flex;
+  min-height: 100vh;
+  flex-direction: column;
+  flex: 1;
+  margin: 0 auto;
+  max-width: 45rem;
+  padding: 0 0.5rem;
+  overflow-x: hidden;
+  word-break: break-word;
+  overflow-wrap: break-word;
+}
+
+/* Make the header bg full width, but the content inline with body */
+header {
+  background: var(--accent-bg);
+  border-bottom: 1px solid var(--border);
+  text-align: center;
+  padding: 2rem 0.5rem;
+  width: 100vw;
+  position: relative;
+  box-sizing: border-box;
+  left: 50%;
+  right: 50%;
+  margin-left: -50vw;
+  margin-right: -50vw;
+}
+
+/* Remove margins for header text */
+header h1,
+header p {
+  margin: 0;
+}
+
+/* Add a little padding to ensure spacing is correct between content and nav */
+main {
+  padding-top: 1.5rem;
+}
+
+/* Fix line height when title wraps */
+h1,
+h2,
+h3 {
+  line-height: 1.1;
+}
+
+/* Format navigation */
+nav {
+  font-size: 1rem;
+  line-height: 2;
+  padding: 1rem 0;
+}
+
+nav a {
+  margin: 1rem 1rem 0 0;
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  color: var(--text) !important;
+  display: inline-block;
+  padding: 0.1rem 1rem;
+  text-decoration: none;
+  transition: 0.4s;
+}
+
+nav a:hover {
+  color: var(--accent) !important;
+  border-color: var(--accent);
+}
+
+nav a.current:hover {
+  text-decoration: none;
+}
+
+footer {
+  margin-top: 4rem;
+  padding: 2rem 1rem 1.5rem 1rem;
+  color: var(--text-light);
+  font-size: 0.9rem;
+  text-align: center;
+  border-top: 1px solid var(--border);
+}
+
+/* Format headers */
+h1 {
+  font-size: calc(
+    var(--base-fontsize) * var(--header-scale) * var(--header-scale) *
+      var(--header-scale) * var(--header-scale)
+  );
+  margin-top: calc(var(--line-height) * 1.5rem);
+}
+
+h2 {
+  font-size: calc(
+    var(--base-fontsize) * var(--header-scale) * var(--header-scale) *
+      var(--header-scale)
+  );
+  margin-top: calc(var(--line-height) * 1.5rem);
+}
+
+h3 {
+  font-size: calc(
+    var(--base-fontsize) * var(--header-scale) * var(--header-scale)
+  );
+  margin-top: calc(var(--line-height) * 1.5rem);
+}
+
+h4 {
+  font-size: calc(var(--base-fontsize) * var(--header-scale));
+  margin-top: calc(var(--line-height) * 1.5rem);
+}
+
+h5 {
+  font-size: var(--base-fontsize);
+  margin-top: calc(var(--line-height) * 1.5rem);
+}
+
+h6 {
+  font-size: calc(var(--base-fontsize) / var(--header-scale));
+  margin-top: calc(var(--line-height) * 1.5rem);
+}
+
+/* Format links & buttons */
+a,
+a:visited {
+  color: var(--accent);
+}
+
+a:hover {
+  text-decoration: none;
+}
+
+a button,
+button,
+[role="button"],
+input[type="submit"],
+input[type="reset"],
+input[type="button"] {
+  border: none;
+  border-radius: 5px;
+  background: var(--accent);
+  font-size: 1rem;
+  color: var(--bg);
+  padding: 0.7rem 0.9rem;
+  margin: 0.5rem 0;
+  transition: 0.4s;
+}
+
+a button[disabled],
+button[disabled],
+[role="button"][aria-disabled="true"],
+input[type="submit"][disabled],
+input[type="reset"][disabled],
+input[type="button"][disabled],
+input[type="checkbox"][disabled],
+input[type="radio"][disabled],
+select[disabled] {
+  cursor: default;
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+input:disabled,
+textarea:disabled,
+select:disabled {
+  cursor: not-allowed;
+  background-color: var(--disabled);
+}
+
+input[type="range"] {
+  padding: 0;
+}
+
+/* Set the cursor to '?' while hovering over an abbreviation */
+abbr {
+  cursor: help;
+}
+
+button:focus,
+button:enabled:hover,
+[role="button"]:focus,
+[role="button"]:not([aria-disabled="true"]):hover,
+input[type="submit"]:focus,
+input[type="submit"]:enabled:hover,
+input[type="reset"]:focus,
+input[type="reset"]:enabled:hover,
+input[type="button"]:focus,
+input[type="button"]:enabled:hover,
+input[type="checkbox"]:focus,
+input[type="checkbox"]:enabled:hover,
+input[type="radio"]:focus,
+input[type="radio"]:enabled:hover {
+  filter: brightness(1.4);
+  cursor: pointer;
+}
+
+/* Format the expanding box */
+details {
+  background: var(--accent-bg);
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  margin-bottom: 1rem;
+}
+
+summary {
+  cursor: pointer;
+  font-weight: bold;
+  padding: 0.6rem 1rem;
+}
+
+details[open] {
+  padding: 0.6rem 1rem 0.75rem 1rem;
+}
+
+details[open] summary {
+  margin-bottom: 0.5rem;
+  padding: 0;
+}
+
+details[open] > *:last-child {
+  margin-bottom: 0;
+}
+
+/* Format tables */
+table {
+  border-collapse: collapse;
+  width: 100%;
+  margin: 1.5rem 0;
+}
+
+td,
+th {
+  border: 1px solid var(--border);
+  text-align: left;
+  padding: 0.5rem;
+}
+
+th {
+  background: var(--accent-bg);
+  font-weight: bold;
+}
+
+tr:nth-child(even) {
+  /* Set every other cell slightly darker. Improves readability. */
+  background: var(--accent-bg);
+}
+
+table caption {
+  font-weight: bold;
+  margin-bottom: 0.5rem;
+}
+
+/* Lists */
+ol,
+ul {
+  padding-left: 3rem;
+}
+
+/* Format forms */
+textarea,
+select,
+input {
+  font-size: inherit;
+  font-family: inherit;
+  padding: 0.5rem;
+  margin-bottom: 0.5rem;
+  color: var(--text);
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  box-shadow: none;
+  box-sizing: border-box;
+  width: 60%;
+  -moz-appearance: none;
+  -webkit-appearance: none;
+  appearance: none;
+}
+
+/* Add arrow to  */
+select {
+  background-image: linear-gradient(45deg, transparent 49%, var(--text) 51%),
+    linear-gradient(135deg, var(--text) 51%, transparent 49%);
+  background-position: calc(100% - 20px), calc(100% - 15px);
+  background-size: 5px 5px, 5px 5px;
+  background-repeat: no-repeat;
+}
+
+select[multiple] {
+  background-image: none !important;
+}
+
+/* checkbox and radio button style */
+input[type="checkbox"],
+input[type="radio"] {
+  vertical-align: bottom;
+  position: relative;
+}
+
+input[type="radio"] {
+  border-radius: 100%;
+}
+
+input[type="checkbox"]:checked,
+input[type="radio"]:checked {
+  background: var(--accent);
+}
+
+input[type="checkbox"]:checked::after {
+  /* Creates a rectangle with colored right and bottom borders which is rotated to look like a check mark */
+  content: " ";
+  width: 0.1em;
+  height: 0.25em;
+  border-radius: 0;
+  position: absolute;
+  top: 0.05em;
+  left: 0.18em;
+  background: transparent;
+  border-right: solid var(--bg) 0.08em;
+  border-bottom: solid var(--bg) 0.08em;
+  font-size: 1.8em;
+  transform: rotate(45deg);
+}
+input[type="radio"]:checked::after {
+  /* creates a colored circle for the checked radio button  */
+  content: " ";
+  width: 0.25em;
+  height: 0.25em;
+  border-radius: 100%;
+  position: absolute;
+  top: 0.125em;
+  background: var(--bg);
+  left: 0.125em;
+  font-size: 32px;
+}
+
+/* Make the textarea wider than other inputs */
+textarea {
+  width: 80%;
+}
+
+/* Makes input fields wider on smaller screens */
+@media only screen and (max-width: 720px) {
+  textarea,
+  select,
+  input {
+    width: 100%;
+  }
+}
+
+/* Ensures the checkbox and radio inputs do not have a set width like other input fields */
+input[type="checkbox"],
+input[type="radio"] {
+  width: auto;
+}
+
+/* do not show border around file selector button */
+input[type="file"] {
+  border: 0;
+}
+
+/* Without this any HTML using <fieldset> shows ugly borders and has additional padding/margin. (Issue #3) */
+fieldset {
+  border: 0;
+  padding: 0;
+  margin: 0;
+}
+
+/* Misc body elements */
+
+hr {
+  color: var(--border);
+  border-top: 1px;
+  margin: 1rem auto;
+}
+
+mark {
+  padding: 2px 5px;
+  border-radius: 4px;
+  background: var(--marked);
+}
+
+main img,
+main video {
+  max-width: 100%;
+  height: auto;
+  border-radius: 5px;
+}
+
+figure {
+  margin: 0;
+}
+
+figcaption {
+  font-size: 0.9rem;
+  color: var(--text-light);
+  text-align: center;
+  margin-bottom: 1rem;
+}
+
+blockquote {
+  margin: 2rem 0 2rem 2rem;
+  padding: 0.4rem 0.8rem;
+  border-left: 0.35rem solid var(--accent);
+  opacity: 0.8;
+  font-style: italic;
+}
+
+cite {
+  font-size: 0.9rem;
+  color: var(--text-light);
+  font-style: normal;
+}
+
+/* Use mono font for code like elements */
+code,
+pre,
+pre span,
+kbd,
+samp {
+  font-size: 1.075rem;
+  font-family: var(--mono-font);
+  color: var(--code);
+}
+
+kbd {
+  color: var(--preformatted);
+  border: 1px solid var(--preformatted);
+  border-bottom: 3px solid var(--preformatted);
+  border-radius: 5px;
+  padding: 0.1rem;
+}
+
+pre {
+  padding: 1rem 1.4rem;
+  max-width: 100%;
+  overflow: auto;
+  overflow-x: auto;
+  color: var(--preformatted);
+  background: var(--accent-bg);
+  border: 1px solid var(--border);
+  border-radius: 5px;
+}
+
+/* Fix embedded code within pre */
+pre code {
+  color: var(--preformatted);
+  background: none;
+  margin: 0;
+  padding: 0;
+}