Add AccountInterstitial model and controller

app/AccountInterstitial.php

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+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class AccountInterstitial extends Model
+{
+	/**
+	* The attributes that should be mutated to dates.
+	*
+	* @var array
+	*/
+	protected $dates = ['read_at', 'appeal_requested_at'];
+
+	public const JSON_MESSAGE = 'Please use web browser to proceed.';
+
+	public function user()
+	{
+		return $this->belongsTo(User::class);
+	}
+
+	public function status()
+	{
+		if($this->item_type != 'App\Status') {
+			return;
+		}
+		return $this->hasOne(Status::class, 'id', 'item_id');
+	}
+}

app/Http/Controllers/AccountInterstitialController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+use App\Status;
+use App\AccountInterstitial;
+
+class AccountInterstitialController extends Controller
+{
+	public function __construct()
+	{
+		$this->middleware('auth');
+	}
+
+    public function get(Request $request)
+    {
+    	$interstitial = $request->user()
+            ->interstitials()
+            ->whereNull('read_at')
+            ->first();
+        if(!$interstitial) {
+            $user = $request->user();
+            $user->has_interstitial = false;
+            $user->save();
+            return redirect('/');
+        }
+        $meta = json_decode($interstitial->meta);
+        $view = $interstitial->view;
+    	return view($view, compact('interstitial', 'meta'));
+    }
+
+    public function read(Request $request)
+    {
+        $this->validate($request, [
+            'id' => 'required',
+            'type' => 'required|in:post.cw,post.removed,post.unlist',
+            'action' => 'required|in:appeal,confirm',
+            'appeal_message' => 'nullable|max:500'
+        ]);
+
+        $redirect = '/';
+
+        $id = decrypt($request->input('id'));
+        $action = $request->input('action');
+        $user = $request->user();
+
+        $ai = AccountInterstitial::whereUserId($user->id)
+            ->whereType($request->input('type'))
+            ->findOrFail($id);
+
+        if($action == 'appeal') {
+            $ai->appeal_requested_at = now();
+            $ai->appeal_message = $request->input('appeal_message');
+        }
+
+        $ai->read_at = now();
+        $ai->save();
+
+        $more = AccountInterstitial::whereUserId($user->id)
+            ->whereNull('read_at')
+            ->exists();
+
+        if(!$more) {
+            $user->has_interstitial = false;
+            $user->save();
+        }
+
+        if(in_array($ai->type, ['post.cw', 'post.unlist'])) {
+            $redirect = Status::findOrFail($ai->item_id)->url();
+        }
+
+        return redirect($redirect);
+    }
+}

database/migrations/2020_12_03_050018_create_account_interstitials_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateAccountInterstitialsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('account_interstitials', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedInteger('user_id')->nullable()->index();
+            $table->string('type')->nullable();
+            $table->string('view')->nullable();
+            $table->bigInteger('item_id')->unsigned()->nullable();
+            $table->string('item_type')->nullable();
+            $table->boolean('has_media')->default(false)->nullable();
+            $table->string('blurhash')->nullable();
+            $table->text('message')->nullable();
+            $table->text('violation_header')->nullable();
+            $table->text('violation_body')->nullable();
+            $table->json('meta')->nullable();
+            $table->text('appeal_message')->nullable();
+            $table->timestamp('appeal_requested_at')->nullable()->index();
+            $table->timestamp('appeal_handled_at')->nullable()->index();
+            $table->timestamp('read_at')->nullable()->index();
+            $table->timestamps();
+        });
+
+        Schema::table('users', function(Blueprint $table) {
+            $table->boolean('has_interstitial')->default(false)->index();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('account_interstitials');
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('has_interstitial');
+        });
+    }
+}