Add authentication and community controllers

Implemented user registration/login system and community management features.
Added controllers for handling posts and community subscriptions.

app/Http/Controllers/AuthController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\User;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Hash;
+
+class AuthController extends Controller
+{
+    public function showRegister()
+    {
+        return view('auth.register');
+    }
+
+    public function register(Request $request)
+    {
+        $validated = $request->validate([
+            'name' => 'required|string|max:255',
+            'email' => 'required|string|email|max:255|unique:users',
+            'password' => 'required|string|min:8|confirmed',
+        ]);
+
+        $user = User::create([
+            'name' => $validated['name'],
+            'email' => $validated['email'],
+            'password' => Hash::make($validated['password']),
+            'karma' => 0,
+        ]);
+
+        Auth::login($user);
+
+        return redirect('/')->with('success', 'Registration successful!');
+    }
+
+    public function showLogin()
+    {
+        return view('auth.login');
+    }
+
+    public function login(Request $request)
+    {
+        $credentials = $request->validate([
+            'email' => 'required|email',
+            'password' => 'required',
+        ]);
+
+        if (Auth::attempt($credentials, $request->boolean('remember'))) {
+            $request->session()->regenerate();
+            return redirect()->intended('/');
+        }
+
+        return back()->withErrors([
+            'email' => 'The provided credentials do not match our records.',
+        ])->onlyInput('email');
+    }
+
+    public function logout(Request $request)
+    {
+        Auth::logout();
+        $request->session()->invalidate();
+        $request->session()->regenerateToken();
+        return redirect('/');
+    }
+}

app/Http/Controllers/CommunityController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Community;
+use Illuminate\Http\Request;
+
+class CommunityController extends Controller
+{
+    public function index()
+    {
+        $communities = Community::withCount(['posts', 'subscribers'])
+            ->orderBy('created_at', 'desc')
+            ->paginate(20);
+
+        return view('communities.index', compact('communities'));
+    }
+
+    public function show(Community $community)
+    {
+        $posts = $community->posts()
+            ->with(['user', 'comments'])
+            ->orderBy('votes', 'desc')
+            ->orderBy('created_at', 'desc')
+            ->paginate(20);
+
+        return view('communities.show', compact('community', 'posts'));
+    }
+
+    public function create()
+    {
+        return view('communities.create');
+    }
+
+    public function store(Request $request)
+    {
+        $validated = $request->validate([
+            'name' => 'required|string|max:255|unique:communities',
+            'description' => 'nullable|string',
+        ]);
+
+        $community = Community::create([
+            'name' => $validated['name'],
+            'description' => $validated['description'] ?? null,
+            'created_by' => auth()->id(),
+        ]);
+
+        return redirect()->route('communities.show', $community)
+            ->with('success', 'Community created successfully!');
+    }
+
+    public function subscribe(Community $community)
+    {
+        auth()->user()->subscribedCommunities()->attach($community->id);
+        return back()->with('success', 'Subscribed to ' . $community->name);
+    }
+
+    public function unsubscribe(Community $community)
+    {
+        auth()->user()->subscribedCommunities()->detach($community->id);
+        return back()->with('success', 'Unsubscribed from ' . $community->name);
+    }
+}

app/Http/Controllers/PostController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Community;
+use App\Models\Post;
+use Illuminate\Http\Request;
+
+class PostController extends Controller
+{
+    public function create()
+    {
+        $communities = Community::orderBy('name')->get();
+        return view('posts.create', compact('communities'));
+    }
+
+    public function store(Request $request)
+    {
+        $validated = $request->validate([
+            'community_id' => 'required|exists:communities,id',
+            'title' => 'required|string|max:255',
+            'content' => 'nullable|string',
+            'url' => 'nullable|url',
+            'type' => 'required|in:text,link,image',
+        ]);
+
+        $post = Post::create([
+            'community_id' => $validated['community_id'],
+            'user_id' => auth()->id(),
+            'title' => $validated['title'],
+            'content' => $validated['content'] ?? null,
+            'url' => $validated['url'] ?? null,
+            'type' => $validated['type'],
+        ]);
+
+        return redirect()->route('posts.show', $post)
+            ->with('success', 'Post created successfully!');
+    }
+
+    public function show(Post $post)
+    {
+        $post->load(['user', 'community', 'comments.user', 'comments.replies.user']);
+        return view('posts.show', compact('post'));
+    }
+
+    public function destroy(Post $post)
+    {
+        if ($post->user_id !== auth()->id()) {
+            abort(403);
+        }
+
+        $post->delete();
+        return redirect('/')->with('success', 'Post deleted successfully!');
+    }
+}