7 files changed, 144 insertions, 33 deletions
diff --git a/controllers/errors.go b/controllers/errors.go
new file mode 100644
index 0000000..019083a
--- /dev/null
+++ b/controllers/errors.go
@@ -0,0 +1,53 @@
+package controllers
+
+import (
+	"lain/types"
+	"lain/utils/shortcuts"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func BadRequest(context *fiber.Ctx, err error) error {
+	return shortcuts.RenderError(types.TemplateError{
+		Context:      context,
+		PageTitle:    "400 – Bad Request",
+		ErrorMessage: shortcuts.BuildErrorMessage(err, "The request could not be understood by the server."),
+		StatusCode:   fiber.StatusBadRequest,
+	})
+}
+
+func Forbidden(context *fiber.Ctx, err error) error {
+	return shortcuts.RenderError(types.TemplateError{
+		Context:      context,
+		PageTitle:    "403 – Forbidden",
+		ErrorMessage: shortcuts.BuildErrorMessage(err, "You do not have permission to access this resource."),
+		StatusCode:   fiber.StatusForbidden,
+	})
+}
+
+func InternalServerError(context *fiber.Ctx, err error) error {
+	return shortcuts.RenderError(types.TemplateError{
+		Context:      context,
+		PageTitle:    "500 – Internal Server Error",
+		ErrorMessage: shortcuts.BuildErrorMessage(err, "An unexpected error occurred on the server."),
+		StatusCode:   fiber.StatusInternalServerError,
+	})
+}
+
+func NotFound(context *fiber.Ctx, err error) error {
+	return shortcuts.RenderError(types.TemplateError{
+		Context:      context,
+		PageTitle:    "404 – Not Found",
+		ErrorMessage: shortcuts.BuildErrorMessage(err, "The page you are looking for does not exist."),
+		StatusCode:   fiber.StatusNotFound,
+	})
+}
+
+func Unauthorized(context *fiber.Ctx, err error) error {
+	return shortcuts.RenderError(types.TemplateError{
+		Context:      context,
+		PageTitle:    "401 – Unauthorized",
+		ErrorMessage: shortcuts.BuildErrorMessage(err, "You must be logged in to access this resource."),
+		StatusCode:   fiber.StatusUnauthorized,
+	})
+}
diff --git a/static/css/style.css b/static/css/main.css
index 683a620..683a620 100644
--- a/static/css/style.css
+++ b/static/css/main.css
diff --git a/templates/auth/login.django b/templates/auth/login.django
index 0fbdceb..33ed81a 100644
--- a/templates/auth/login.django
+++ b/templates/auth/login.django
@@ -1,37 +1,25 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>{{ Title }}</title>
-    <link rel="stylesheet" href="/static/css/style.css" />
-  </head>
-  <body class="login-page">
-    <div class="login-container">
-      <h1>{{ AppName }}</h1>
-      <p class="subtitle">{{ AppDescription }}</p>
+{% extends 'layouts/generic.django' %}
+{% block content %}
+  <div class="login-container">
+    <h1>{{ AppName }}</h1>
+    <p class="subtitle">{{ AppDescription }}</p>
 
-      {% if Error %}
-        <div class="error">{{ Error }}</div>
-      {% endif %}
+    {% if Error %}
+      <div class="error">{{ Error }}</div>
+    {% endif %}
 
-      <form method="POST" action="{% url 'auth.login' %}">
-        <div class="field">
-          <label>Email</label>
-          <input type="email" name="email" required autofocus />
-        </div>
+    <form method="POST" action="{% url 'auth.login' %}">
+      <div class="field">
+        <label>Email</label>
+        <input type="email" name="email" required autofocus />
+      </div>
 
-        <div class="field">
-          <label>Password</label>
-          <input type="password" name="password" required />
-        </div>
+      <div class="field">
+        <label>Password</label>
+        <input type="password" name="password" required />
+      </div>
 
-        <button type="submit">Login</button>
-      </form>
-
-      <footer>
-        {{ AppName }} - Powered by {{ AppEngine }} - &copy; <a href="https://shi.foo" target="_blank" rel="noopener noreferrer">shi.foo</a> 2025
-      </footer>
-    </div>
-  </body>
-</html>
+      <button type="submit">Login</button>
+    </form>
+  </div>
+{% endblock %}
diff --git a/templates/error.django b/templates/error.django
new file mode 100644
index 0000000..f766688
--- /dev/null
+++ b/templates/error.django
@@ -0,0 +1,8 @@
+{% extends 'layouts/generic.django' %}
+{% block content %}
+  <div class="error-container">
+    <h1>{{ ErrorTitle }}</h1>
+    <p>{{ ErrorMessage }}</p>
+    <a href="{% url 'auth.login' %}">Go back home</a>
+  </div>
+{% endblock %}
diff --git a/templates/layouts/generic.django b/templates/layouts/generic.django
new file mode 100644
index 0000000..3ca183b
--- /dev/null
+++ b/templates/layouts/generic.django
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <title>{{ Title }} - {{ Appname }}</title>
+    <link rel="stylesheet" href="/static/css/main.css" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="manifest" href="/static/extra/site.webmanifest" />
+    {% block head %}
+
+    {% endblock %}
+  </head>
+  <body>
+    <main class="content">
+      {% block content %}
+
+      {% endblock %}
+    </main>
+
+    <footer>
+      {{ AppName }} - Powered by {{ AppEngine }} - &copy; <a href="https://shi.foo" target="_blank" rel="noopener noreferrer">shi.foo</a> 2025
+    </footer>
+  </body>
+  {% block scripts %}
+
+  {% endblock %}
+</html>
diff --git a/types/errors.go b/types/errors.go
new file mode 100644
index 0000000..11f60f9
--- /dev/null
+++ b/types/errors.go
@@ -0,0 +1,10 @@
+package types
+
+import "github.com/gofiber/fiber/v2"
+
+type TemplateError struct {
+	Context      *fiber.Ctx
+	PageTitle    string
+	ErrorMessage error
+	StatusCode   int
+}
diff --git a/utils/shortcuts/error.go b/utils/shortcuts/error.go
new file mode 100644
index 0000000..4cb0e81
--- /dev/null
+++ b/utils/shortcuts/error.go
@@ -0,0 +1,25 @@
+package shortcuts
+
+import (
+	"errors"
+	"lain/types"
+	"lain/utils/meta"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func BuildErrorMessage(err error, alternateString string) error {
+	if err != nil {
+		return err
+	}
+
+	return errors.New(alternateString)
+}
+
+func RenderError(error types.TemplateError) error {
+	meta.SetPageTitle(error.Context, error.PageTitle)
+	return RenderWithStatus(error.Context, "error", fiber.Map{
+		"ErrorTitle":   error.PageTitle,
+		"ErrorMessage": error.ErrorMessage.Error(),
+	}, error.StatusCode)
+}