Add template function experimental cmd

cmd/bcrypt/bcrypt.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func main() {
+	switch os.Args[1] {
+	case "hash":
+		hash(os.Args[2])
+	case "compare":
+		compare(os.Args[2], os.Args[3])
+	default:
+		fmt.Printf("Invalid command: %v\n", os.Args[1])
+	}
+}
+
+func hash(password string) {
+	fmt.Printf("Hash the password %q\n", password)
+	hashedBytes, err := bcrypt.GenerateFromPassword(
+		[]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		fmt.Printf("error hashing: %v\n", err)
+		return
+	}
+	hash := string(hashedBytes)
+	fmt.Println(hash)
+}
+
+func compare(password, hash string) {
+	fmt.Printf("Compare the password %q with the hash %q\n", password, hash)
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	if err != nil {
+		fmt.Printf("Password is invalid: %v\n", password)
+		return
+	}
+	fmt.Println("Password is correct!")
+}

cmd/exp/exp.go

@@ -0,0 +1,144 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	_ "github.com/jackc/pgx/v4/stdlib"
+)
+
+func AddUser(db *sql.DB, name string, email string) (error, int) {
+	row := db.QueryRow(`
+    INSERT INTO users(name, email)
+    VALUES($1, $2)
+    RETURNING id;
+  `, name, email)
+	var id int
+	err := row.Scan(&id)
+	return err, id
+}
+
+func QueryUser(db *sql.DB, id int) (error, string, string) {
+	row := db.QueryRow(`
+  SELECT name, email
+  FROM users
+  WHERE id=$1;`, id)
+	var name, email string
+	err := row.Scan(&name, &email)
+	return err, name, email
+}
+
+type Order struct {
+	ID     int
+	UID    int
+	Amount int
+	Desc   string
+}
+
+func AddOrder(db *sql.DB, uid int, amount int, desc string) (error, int) {
+	row := db.QueryRow(`
+    insert into orders(user_id, amount, description)
+    values($1, $2, $3)
+    returning id;
+  `, uid, amount, desc)
+	var id int
+	err := row.Scan(&id)
+	return err, id
+}
+
+func QueryOrders(db *sql.DB, uid int) ([]Order, error) {
+	var orders []Order
+	rows, err := db.Query(`
+    select id, amount, description from orders where user_id=$1
+  `, uid)
+	if err != nil {
+		return orders, err
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var order Order
+		order.UID = uid
+		err := rows.Scan(&order.ID, &order.Amount, &order.Desc)
+		if err != nil {
+			return orders, err
+		}
+		orders = append(orders, order)
+	}
+	err = rows.Err()
+	return orders, err
+}
+
+func main() {
+	db, err := sql.Open("pgx", "host=localhost port=5432 user=baloo  dbname=lenslocked sslmode=disable")
+	if err != nil {
+		panic(err)
+	}
+	defer db.Close()
+	err = db.Ping()
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("Connected!")
+	_, err = db.Exec(`
+  create table if not exists users (
+    id serial primary key,
+    name text,
+    email text not null
+  );
+  create table if not exists orders (
+    id serial primary key,
+    user_id int not null,
+    amount int,
+    description text
+  );`)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Tables created")
+
+	var name string
+	var email string
+
+	// Create User
+	/*
+		name = "Jon Rob Baker"
+		email = "demo@user.com"
+		err, id := AddUser(db, name, email)
+		if err != nil {
+			panic(err)
+		}
+		fmt.Println("User ", id, " created")
+	*/
+
+	// Query User
+	err, name, email = QueryUser(db, 5)
+	if err == sql.ErrNoRows {
+		fmt.Println("Error, no rows!")
+	}
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("User information: name=%s, email=%s\n", name, email)
+
+	uid := 5
+
+	// Create fake orders
+	/*
+		for i := 1; i <= 5; i++ {
+			amount := i * 100
+			desc := fmt.Sprintf("Fake order #%d", i)
+			err, _ := AddOrder(db, uid, amount, desc)
+			if err != nil {
+				panic(err)
+			}
+		}
+		fmt.Println("Created fake orders")
+	*/
+
+	// Query Orders
+	orders, err := QueryOrders(db, uid)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Orders: ", orders)
+}

cmd/tplfn/tplfn.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"html/template"
+	"os"
+)
+
+func main() {
+	tplstr := "hello {{myFunc}}\n"
+
+	fmap := template.FuncMap{}
+	fmap["myFunc"] = func() (string, error) {
+		return "world", fmt.Errorf("hi")
+	}
+
+	tpl, err := template.New("demo").Funcs(fmap).Parse(tplstr)
+	if err != nil {
+		panic(fmt.Errorf("Error creating template: %v", err))
+	}
+
+	err = tpl.Execute(os.Stdout, nil)
+	if err != nil {
+		panic(err)
+	}
+}

controllers/static.go

@@ -0,0 +1,49 @@
+package controllers
+
+import (
+	"git.kealoha.me/lks/lenslocked/templates"
+	"git.kealoha.me/lks/lenslocked/views"
+	"net/http"
+)
+
+type Template interface {
+	Execute(w http.ResponseWriter, r *http.Request, data interface{})
+}
+
+func StaticController(templatePath ...string) http.HandlerFunc {
+	tpl := views.Must(views.FromFS(templates.FS, templatePath...))
+
+	err := tpl.TestTemplate(nil)
+	if err != nil {
+		panic(err)
+	}
+
+	return func(w http.ResponseWriter, r *http.Request) { tpl.Execute(w, r, nil) }
+}
+
+func FAQ(templatePath ...string) http.HandlerFunc {
+	questions := []struct {
+		Question string
+		Answer   string
+	}{
+		{
+			Question: "Is this a real website?",
+			Answer:   "No.",
+		},
+		{
+			Question: "I Can Has Cheezburger?",
+			Answer:   "No.",
+		},
+	}
+
+	tpl := views.Must(views.FromFS(templates.FS, templatePath...))
+
+	err := tpl.TestTemplate(nil)
+	if err != nil {
+		panic(err)
+	}
+
+	return func(w http.ResponseWriter, r *http.Request) {
+		tpl.Execute(w, r, questions)
+	}
+}

controllers/users.go

@@ -0,0 +1,104 @@
+package controllers
+
+import (
+	"fmt"
+	"net/http"
+
+	"git.kealoha.me/lks/lenslocked/models"
+	"git.kealoha.me/lks/lenslocked/templates"
+	"git.kealoha.me/lks/lenslocked/views"
+)
+
+type Users struct {
+	Templates struct {
+		Signup Template
+		Signin Template
+	}
+	UserService *models.UserService
+}
+
+func (u Users) GetSignup(w http.ResponseWriter, r *http.Request) {
+	var data struct {
+		Email string
+	}
+	data.Email = r.FormValue("email")
+	u.Templates.Signup.Execute(w, r, data)
+}
+
+func (u Users) PostSignup(w http.ResponseWriter, r *http.Request) {
+	email := r.FormValue("email")
+	password := r.FormValue("password")
+	user, err := u.UserService.Create(email, password)
+	if err != nil {
+		fmt.Println(err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	fmt.Fprintf(w, "User created: %+v", user)
+}
+
+func (u Users) GetSignin(w http.ResponseWriter, r *http.Request) {
+	var data struct {
+		Email string
+	}
+	data.Email = r.FormValue("email")
+	u.Templates.Signin.Execute(w, r, data)
+}
+func (u Users) PostSignin(w http.ResponseWriter, r *http.Request) {
+	var data struct {
+		Email    string
+		Password string
+	}
+	data.Email = r.FormValue("email")
+	data.Password = r.FormValue("password")
+	user, err := u.UserService.Authenticate(data.Email, data.Password)
+	if err != nil {
+		fmt.Println(err)
+		http.Error(w, "Something went wrong.", http.StatusInternalServerError)
+		return
+	}
+
+	// Bad cookie
+	cookie := http.Cookie{
+		Name:     "bad",
+		Value:    user.Email,
+		Path:     "/",
+		HttpOnly: true,
+	}
+	http.SetCookie(w, &cookie)
+
+	fmt.Fprintf(w, "User authenticated: %+v", user)
+}
+
+func (u Users) CurrentUser(w http.ResponseWriter, r *http.Request) {
+	email, err := r.Cookie("bad")
+	if err != nil {
+		fmt.Fprint(w, "The bad cookie could not be read.")
+		return
+	}
+	fmt.Fprintf(w, "Bad cookie: %s\n", email.Value)
+}
+
+func WithTemplates(user_service *models.UserService, signup Template, signin Template) Users {
+	u := Users{}
+	u.Templates.Signup = signup
+	u.Templates.Signin = signin
+	u.UserService = user_service
+	return u
+}
+
+func Default(user_service *models.UserService, templatePath ...string) Users {
+	signup_tpl := views.Must(views.FromFS(templates.FS, "signup.gohtml", "tailwind.gohtml"))
+	signin_tpl := views.Must(views.FromFS(templates.FS, "signin.gohtml", "tailwind.gohtml"))
+
+	err := signup_tpl.TestTemplate(nil)
+	if err != nil {
+		panic(err)
+	}
+	err = signin_tpl.TestTemplate(nil)
+	if err != nil {
+		panic(err)
+	}
+
+	return WithTemplates(user_service, signup_tpl, signin_tpl)
+}

go.mod

@@ -1,3 +1,22 @@
 module git.kealoha.me/lks/lenslocked
 
 go 1.22.5
+
+require (
+	github.com/go-chi/chi/v5 v5.1.0
+	github.com/jackc/pgx/v4 v4.18.3
+	golang.org/x/crypto v0.26.0
+)
+
+require (
+	github.com/gorilla/csrf v1.7.2
+	github.com/gorilla/securecookie v1.1.2 // indirect
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgconn v1.14.3 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.3.3 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgtype v1.14.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+)

go.sum

@@ -0,0 +1,188 @@
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+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=

main.go

@@ -1,50 +1,68 @@
 package main
 
 import (
+	"database/sql"
 	"fmt"
 	"net/http"
+	"os"
+
+	ctrlrs "git.kealoha.me/lks/lenslocked/controllers"
+	"git.kealoha.me/lks/lenslocked/models"
+	"github.com/go-chi/chi/v5"
+	"github.com/gorilla/csrf"
+
+	"github.com/go-chi/chi/v5/middleware"
+	_ "github.com/jackc/pgx/v4/stdlib"
 )
 
-func homeHandler(w http.ResponseWriter, r *http.Request) {
+const DEBUG bool = true
-	w.Header().Set("Content-Type", "text/html; charset=utf8")
-	fmt.Fprint(w, "<h1>Welcome to my awesome site!</h1>")
-}
-func contactHandler(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "text/html; charset=utf8")
-	fmt.Fprint(w, "<h1>Contact Page</h1><p>To get in touch, email me at <a href=\"mailto:example@example.com\">example@example.com</a></p>")
-}
-func faqHandler(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "text/html; charset=utf8")
-	fmt.Fprint(w, `
-    <h1>FAQ</h1>
-    <hr>
-    <h3>Is this a real website?</h3>
-    <p>No.</p>
-    <h3>I Can Has Cheezburger?</h3>
-    <p>No.</p>
-  `)
-}
 
-type Router struct{}
+func notFoundHandler(w http.ResponseWriter, r *http.Request) {
-
-func (router Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	switch r.URL.Path {
-	case "/":
-		homeHandler(w, r)
-	case "/contact":
-		contactHandler(w, r)
-	case "/faq":
-		faqHandler(w, r)
-	default:
 	w.Header().Set("Content-Type", "text/html; charset=utf8")
 	w.WriteHeader(http.StatusNotFound)
 	fmt.Fprint(w, "404 page not found")
 }
-	fmt.Fprintf(w, "<hr><p>%s</p>", r.URL.Path)
+
+func ConnectDB() *sql.DB {
+	db, err := sql.Open("pgx", os.Getenv("LENSLOCKED_DB_STRING"))
+	if err != nil {
+		panic(fmt.Sprint("Error connecting to database: %w", err))
+	}
+	err = db.Ping()
+	if err != nil {
+		panic(fmt.Sprint("Error connecting to database: %w", err))
+	}
+	return db
 }
 
 func main() {
-	var router Router
+	csrfKey := []byte(os.Getenv("LENSLOCKED_CSRF_KEY"))
-	fmt.Println("Starting the server on :3000...")
+	if len(csrfKey) < 32 {
-	http.ListenAndServe(":3000", router)
+		panic("Error: bad csrf protection key")
+	}
+
+	db := ConnectDB()
+	defer db.Close()
+
+	userService := models.UserService{DB: db}
+	var usersCtrlr ctrlrs.Users = ctrlrs.Default(&userService)
+
+	r := chi.NewRouter()
+
+	r.Use(middleware.Logger)
+
+	r.Get("/", ctrlrs.StaticController("home.gohtml", "tailwind.gohtml"))
+	r.Get("/contact", ctrlrs.StaticController("contact.gohtml", "tailwind.gohtml"))
+	r.Get("/faq", ctrlrs.FAQ("faq.gohtml", "tailwind.gohtml"))
+
+	r.Get("/signup", usersCtrlr.GetSignup)
+	r.Post("/signup", usersCtrlr.PostSignup)
+	r.Get("/signin", usersCtrlr.GetSignin)
+	r.Post("/signin", usersCtrlr.PostSignin)
+
+	r.Get("/user", usersCtrlr.CurrentUser)
+
+	r.NotFound(notFoundHandler)
+	fmt.Println("Starting the server on :3000...")
+	http.ListenAndServe(":3000", csrf.Protect(csrfKey, csrf.Secure(!DEBUG))(r))
 }

models/sql/users.sql

@@ -0,0 +1,5 @@
+CREATE TABLE users (
+  id SERIAL PRIMARY KEY,
+  email TEXT UNIQUE NOT NULL,
+  password_hash TEXT NOT NULL
+);

models/user.go

@@ -0,0 +1,64 @@
+package models
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+type User struct {
+	ID           int
+	Email        string
+	PasswordHash string
+}
+
+type UserService struct {
+	DB *sql.DB
+}
+
+func (us *UserService) Create(email, password string) (*User, error) {
+	email = strings.ToLower(email)
+
+	hashedBytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, fmt.Errorf("create user: %w", err)
+	}
+	passwordHash := string(hashedBytes)
+
+	user := User{
+		Email:        email,
+		PasswordHash: passwordHash,
+	}
+	row := us.DB.QueryRow(`
+    INSERT INTO users (email, password_hash)
+    VALUES ($1, $2) RETURNING id
+  `, email, passwordHash)
+	err = row.Scan(&user.ID)
+	if err != nil {
+		return nil, fmt.Errorf("create user: %w", err)
+	}
+	return &user, nil
+}
+
+func (us UserService) Authenticate(email, password string) (*User, error) {
+	user := User{
+		Email: strings.ToLower(email),
+	}
+
+	row := us.DB.QueryRow(`
+    SELECT id, password_hash
+    FROM users WHERE email=$1
+  `, email)
+	err := row.Scan(&user.ID, &user.PasswordHash)
+	if err != nil {
+		return nil, fmt.Errorf("authenticate: %w", err)
+	}
+
+	err = bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password))
+	if err != nil {
+		return nil, fmt.Errorf("authenticate: %w", err)
+	}
+	return &user, nil
+}

templates/contact.gohtml

@@ -0,0 +1,12 @@
+<!doctype html>
+<html>
+  {{template "head" .}}
+  <body>
+    {{template "header".}}
+    <main class="px-6">
+      <h1 class="py-4 text-4xl semibold tracking-tight font-sans">Contact Page</h1>
+      <p>To get in touch, email me at <a class="underline" href="mailto:example@example.com">example@example.com</a></p>
+    </main>
+    {{template "footer" .}}
+  </body>
+</html>

templates/faq.gohtml

@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+  {{template "head" .}}
+  <body>
+    {{template "header".}}
+    <main class="px-6">
+      <h1 class="py-4 text-4xl semibold tracking-tight">FAQ</h1>
+      <hr class="pb-4">
+      <div class="flex flex-col gap-8">
+      {{range .}}
+        {{template "qa" .}}
+      {{end}}
+      </div>
+    </main>
+    {{template "footer" .}}
+  </body>
+</html>
+
+
+
+
+{{define "qa"}}
+<div>
+<h3 class="block text-lg semibold">{{.Question}}</h3>
+<p class="block text-sm ml-2">{{.Answer}}</p>
+</div>
+{{end}}

templates/fs.go

@@ -0,0 +1,6 @@
+package templates
+
+import "embed"
+
+//go:embed *
+var FS embed.FS

templates/home.gohtml

@@ -0,0 +1,29 @@
+<!doctype html>
+<html>
+  {{template "head" .}}
+  <body>
+    {{template "header".}}
+    <main class="px-6">
+      <h1 class="py-4 text-4xl semibold tracking-tight">
+        Welcome to my awesome site!
+      </h1>
+      <div class="flex flex-col gap-4">
+        {{template "lorem-ipsum"}}
+        {{template "lorem-ipsum"}}
+        {{template "lorem-ipsum"}}
+      </div>
+    </main>
+    {{template "footer" .}}
+  </body>
+</html>
+
+{{define "lorem-ipsum"}}
+    <p>
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
+      incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis
+      nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+      Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore
+      eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt
+      in culpa qui officia deserunt mollit anim id est laborum.
+    </p>
+{{end}}

templates/signin.gohtml

@@ -0,0 +1,65 @@
+<!doctype html>
+<html>
+  {{template "head" .}}
+  <body class="min-h-screen bg-gray-100">
+    {{template "header".}}
+    <main class="py-12 flex justify-center">
+      <div class="px-8 py-8 bg-white rounded shadow">
+        <h1 class="pt-4 pb-8 text-center text-3xl font-bold text-gray-900">
+          Welcome back!
+        </h1>
+        <form action="/signin" method="post">
+          {{csrfField}}
+          <div class="py-2">
+            <label for="email" class="text-sm font-semibold text-gray-800">
+              Email Address
+            </label>
+            <input
+              name="email"
+              id="email"
+              type="email"
+              placeholder="Email address"
+              required
+              autocomplete="email"
+              class="w-full px-3 py-2 border border-gray-300 placeholder-gray-500
+                text-gray-800 rounded"
+              value="{{.Email}}"
+              {{if not .Email}}autofocus{{end}}
+            />
+          </div>
+          <div class="py-2">
+            <label for="password" class="text-sm font-semibold text-gray-800">
+              Password
+            </label>
+            <input
+              name="password"
+              id="password"
+              type="password"
+              placeholder="Password"
+              required
+              class="w-full px-3 py-2 border border-gray-300 placeholder-gray-500
+                text-gray-800 rounded"
+              {{if .Email}}autofocus{{end}}
+            />
+          </div>
+          <div class="py-4">
+            <button class="w-full py-4 px-2 bg-indigo-600 hover:bg-indigo-700
+              text-white rounded font-bold text-lg">
+              Sign in
+            </button>
+          </div>
+          <div class="py-2 w-full flex justify-between">
+            <p class="text-xs text-gray-500">
+              Need an account?
+              <a href="/signup" class="underline">Sign up</a>
+            </p>
+            <p class="text-xs text-gray-500">
+              <a href="/reset-pw" class="underline">Forgot your password?</a>
+            </p>
+          </div>
+        </form>
+      </div>
+    </main>
+    {{template "footer" .}}
+  </body>
+</html>

templates/signup.gohtml

@@ -0,0 +1,53 @@
+<!doctype html>
+<html>
+  {{template "head" .}}
+  <body class="min-h-screen bg-gray-100">
+    {{template "header".}}
+    <main class="px-6">
+      <div class="py-12 flex justify-center">
+        <div class="px-8 py-8 bg-white rounded shadow">
+          <h1 class="pt-4 pb-8 text-center text-3xl font-bold text-gray-900">
+            Sign Up!
+          </h1>
+          <form action="/signup" method="post">
+            {{csrfField}}
+            <div>
+              <label for="signupEmail" class="text-sm font-semibold text-gray-800">Email Address</label>
+              <input name="email" id="signupEmail" type="email" placeholder="Email address" required autocomplete="email" 
+                class="w-full px-3 py-2 boarder boarder-gray-300 placeholder-gray-500 text-gray-800 rounded"
+                value="{{.Email}}"
+                {{if not .Email}}autofocus{{end}}
+              />
+            </div>
+            <div>
+              <label for="signupPassword" class="text-sm font-semibold text-gray-800">Password</label>
+              <input name="password" id="signupPassword" type="password" placeholder="password" required
+                class="w-full px-3 py-2 boarder boarder-gray-300 placeholder-gray-500 text-gray-800 rounded"
+                {{if .Email}}autofocus{{end}}
+              />
+            </div>
+            <div>
+              <label for="referalCode" class="text-sm font-semibold text-gray-800">Referal Code</label>
+              <input name="referalCode" id="referalCode" type="text" placeholder="Referal Code" required
+                class="w-full px-3 py-2 boarder boarder-gray-300 placeholder-gray-500 text-gray-800 rounded"
+              />
+            </div>
+            <div>
+              <button type="submit" class="w-full py-4 px-2 bg-indigo-600 hover:bg-indigo-700 text-white rounded font-bold text-lg">Sign up</button>
+            </div>
+            <div class="py-2 w-full flex justify-between">
+              <p class="text-xs text-gray-500">
+                Already have an account?
+                <a href="/signin" class="underline">Sign in</a>
+              </p>
+              <p class="text-xs text-gray-500">
+                <a href="/reset-pw" class="underline">Forgot your password?</a>
+              </p>
+            </div>
+          </form>
+        </div>
+      </div>
+    </main>
+    {{template "footer" .}}
+  </body>
+</html>

templates/tailwind.gohtml

@@ -0,0 +1,30 @@
+{{define "head"}}
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link href="https://unpkg.com/tailwindcss@^2/dist/tailwind.min.css" rel="stylesheet">
+  </head>
+{{end}}
+
+{{define "header"}}
+    <header class="bg-gradient-to-r from-blue-800 to-indigo-800 text-white">
+      <nav class="px-6 py-6 flex items-center space-x-12">
+        <div class="text-2xl font-serif">Lenslocked</div>
+        <div class="flex-grow">
+          <a class="text-base font-semibold hover:text-blue-100 pr-8" href="/">Home</a>
+          <a class="text-base font-semibold hover:text-blue-100 pr-8" href="/contact">Contact</a>
+          <a class="text-base font-semibold hover:text-blue-100 pr-8" href="/faq">FAQ</a>
+        </div>
+        <div class="space-x-4">
+          <a href="/signin">Sign in</a>
+          <a href="/signup" clss="px-4 py-2 bg-blue-700 hover:bg-blue-600 rounded">Sign up</a>
+        </div>
+      </nav>
+    </header>
+{{end}}
+
+{{define "footer"}}
+    <br>
+    <hr>
+    <p class="text-gray-400 font-light">Copyright your mom 2057</p>
+{{end}}

views/template.go

@@ -0,0 +1,73 @@
+package views
+
+import (
+	"fmt"
+	"html/template"
+	"io/fs"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/gorilla/csrf"
+)
+
+type Template struct {
+	htmlTpl *template.Template
+}
+
+func (t Template) Execute(w http.ResponseWriter, r *http.Request, data interface{}) {
+	tpl, err := t.htmlTpl.Clone()
+	if err != nil {
+		log.Printf("Template Clone Error: %v", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+
+	tpl = tpl.Funcs(template.FuncMap{
+		"csrfField": func() template.HTML { return csrf.TemplateField(r) },
+	})
+
+	w.Header().Set("Content-Type", "text/html; charset=utf8")
+	err = tpl.Execute(w, data)
+	if err != nil {
+		log.Printf("Error executing template: %v", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+}
+func (t Template) TestTemplate(data interface{}) error {
+	var testWriter strings.Builder
+	tpl, err := t.htmlTpl.Clone()
+	if err != nil {
+		return err
+	}
+	return tpl.Execute(&testWriter, data)
+}
+
+func FromFile(pattern ...string) (Template, error) {
+	fs := os.DirFS(".")
+	return FromFS(fs, pattern...)
+}
+func FromFS(fs fs.FS, pattern ...string) (Template, error) {
+	tpl := template.New(pattern[0])
+	tpl = tpl.Funcs(template.FuncMap{
+		"csrfField": func() template.HTML {
+			return `<div class="hidden">STUB: PLACEHOLDER</div>`
+		},
+	})
+	tpl, err := tpl.ParseFS(fs, pattern...)
+	if err != nil {
+		return Template{}, fmt.Errorf("Error parsing template: %v", err)
+	}
+	return Template{
+		htmlTpl: tpl,
+	}, nil
+}
+
+func Must(t Template, err error) Template {
+	if err != nil {
+		panic(err)
+	}
+	return t
+}