Overhaul code org, and improve image uploading

This commit introduces breaking changes. It overhauls how and where
services are configured and placed in the codebase, as well as moving
the entire source into src/ It also changes how these integrations
are configured via environment variables. Old configs will still work
for now, but it is strongly suggested that you migrate your config.

src/middleware/admin.go

@@ -0,0 +1,53 @@
+package middleware
+
+import (
+	"database/sql"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/gofiber/fiber/v3"
+)
+
+type Session struct {
+	SessionID string `json:"session_id"`
+	ExpiresAt string `json:"expires_at"`
+}
+
+func AdminMiddleware(db *sql.DB) func(c fiber.Ctx) error {
+	return func(c fiber.Ctx) error {
+		sessionToken := c.Cookies("SessionToken")
+		if sessionToken == "" {
+			return c.Next()
+		}
+
+		// Check if session exists
+		var session Session
+		err := db.QueryRow(`
+			SELECT session_id, expires_at 
+			FROM sessions 
+			WHERE session_id = ?
+		`, sessionToken).Scan(&session.SessionID, &session.ExpiresAt)
+		if err != nil {
+			slog.Error("Failed to check session", "error", err)
+			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+				"message": fmt.Sprintf("Failed to check session: %v", err),
+			})
+		}
+
+		sessionExpiry, err := time.Parse("2006-01-02 15:04:05-07:00", session.ExpiresAt)
+		if err != nil {
+			slog.Error("Failed to parse session expiry", "error", err)
+			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+				"message": fmt.Sprintf("Failed to parse session expiry: %v", err),
+			})
+		}
+
+		if sessionExpiry.Before(time.Now()) {
+			return c.Next()
+		}
+
+		c.Locals("IsAdmin", true)
+		return c.Next()
+	}
+}