feat: messages extension (#4028)

* feat: private messages

extensions/messages/migrations/2024_09_01_000000_create_dialogs_table.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Flarum\Database\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+return Migration::createTable(
+    'dialogs',
+    function (Blueprint $table) {
+        $table->bigIncrements('id');
+        $table->unsignedBigInteger('first_message_id')->nullable();
+        $table->unsignedBigInteger('last_message_id')->nullable();
+        $table->dateTime('last_message_at')->nullable();
+        $table->unsignedInteger('last_message_user_id')->nullable();
+        $table->foreign('last_message_user_id')->references('id')->on('users')->nullOnDelete();
+        $table->string('type');
+        $table->timestamps();
+    }
+);

extensions/messages/migrations/2024_09_01_000001_create_dialog_messages_table.php

@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Flarum\Database\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+return Migration::createTable(
+    'dialog_messages',
+    function (Blueprint $table) {
+        $table->bigIncrements('id');
+        $table->foreignId('dialog_id')->constrained()->cascadeOnDelete();
+        $table->unsignedInteger('user_id')->nullable();
+        $table->foreign('user_id')->references('id')->on('users')->cascadeOnDelete();
+        $table->text('content');
+        $table->timestamps();
+    }
+);

extensions/messages/migrations/2024_09_01_000002_create_dialog_user_table.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Flarum\Database\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+return Migration::createTable(
+    'dialog_user',
+    function (Blueprint $table) {
+        $table->id();
+        $table->foreignId('dialog_id')->constrained()->cascadeOnDelete();
+        $table->unsignedInteger('user_id');
+        $table->dateTime('joined_at');
+        $table->unsignedBigInteger('last_read_message_id')->default(0);
+        $table->dateTime('last_read_at')->nullable();
+        $table->foreign('user_id')->references('id')->on('users')->cascadeOnDelete();
+    }
+);

extensions/messages/migrations/2024_09_01_000003_add_dialog_message_foreign_keys_to_dialogs.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('dialogs', function (Blueprint $table) {
+            $table->foreign('first_message_id')->references('id')->on('dialog_messages')->nullOnDelete();
+            $table->foreign('last_message_id')->references('id')->on('dialog_messages')->nullOnDelete();
+        });
+    },
+    'down' => function (Builder $schema) {
+        $schema->table('dialogs', function (Blueprint $table) {
+            $table->dropForeign(['first_message_id']);
+            $table->dropForeign(['last_message_id']);
+        });
+    }
+];

extensions/messages/migrations/2024_09_03_000000_seed_permissions.php

@@ -0,0 +1,15 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Flarum\Database\Migration;
+use Flarum\Group\Group;
+
+return Migration::addPermissions([
+    'dialog.sendMessage' => Group::MEMBER_ID,
+]);