Identify tenants by the "Origin" header (#21)

* Add origin ID MW

* Test origin ID MW

* Test origin ID MW with early identification

* Fix code style (php-cs-fixer)

* Fix PHPStan errors

* Add getDomain() to domain ID MW, simplify origin ID MW

* Fix code style (php-cs-fixer)

* Rename InitializeTenancyByOrigin to InitializeTenancyByOriginHeader

* Add onFail test

* Stop throwing the exception in getDomain()

* FIx merge

* Improve origin identification test file

* Clean up test

---------

Co-authored-by: PHP CS Fixer <phpcsfixer@example.com>

tests/OriginHeaderIdentificationTest.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+use Stancl\Tenancy\Tests\Etc\Tenant;
+use Illuminate\Support\Facades\Route;
+use Stancl\Tenancy\Middleware\InitializeTenancyByOriginHeader;
+
+beforeEach(function () {
+    InitializeTenancyByOriginHeader::$onFail = null;
+
+    config([
+        'tenancy.central_domains' => [
+            'localhost',
+        ],
+    ]);
+
+    Route::post('/home', function () {
+        return response(tenant('id'));
+    })->middleware([InitializeTenancyByOriginHeader::class])->name('home');
+});
+
+afterEach(function () {
+    InitializeTenancyByOriginHeader::$onFail = null;
+});
+
+test('origin identification works', function () {
+    $tenant = Tenant::create();
+
+    $tenant->domains()->create([
+        'domain' => 'foo',
+    ]);
+
+    pest()
+        ->withHeader('Origin', 'foo.localhost')
+        ->post('home')
+        ->assertSee($tenant->id);
+});
+
+test('tenant routes are not accessible on central domains while using origin identification', function () {
+    pest()
+        ->withHeader('Origin', 'localhost')
+        ->post('home')
+        ->assertStatus(500);
+});
+
+test('onfail logic can be customized', function() {
+    InitializeTenancyByOriginHeader::$onFail = function () {
+        return response('onFail message');
+    };
+
+    pest()
+        ->withHeader('Origin', 'bar.localhost') // 'bar'/'bar.localhost' is not an existing tenant domain
+        ->post('home')
+        ->assertSee('onFail message');
+});