Add 'Vendor Package Listing' page

app/routes.php

@@ -8,6 +8,7 @@
 use App\Application\Action\Package\ViewPackageAction;
 use App\Application\Action\Package\ViewPackageBadgeAction;
 use App\Application\Action\System\HealthAction;
+use App\Application\Action\Vendor\ListPackagesAction as ListVendorPackagesAction;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Slim\App;
@@ -33,6 +34,9 @@ function (ServerRequestInterface $request, ResponseInterface $response): Respons
     function (Group $group) {
       $group
         ->get('', RedirectListPackagesAction::class);
+      $group
+        ->get('/{vendor}', ListVendorPackagesAction::class)
+        ->setName('listVendorPackages');
       $group
         ->get('/{vendor}/{project}/status.svg', RedirectPackageBadgeAction::class)
         ->setName('redirectPackageBadge');

resources/views/vendor/list.twig

@@ -0,0 +1,30 @@
+{% extends "template.twig" %}
+
+{% block title %}Keep your dependencies up-to-date - PHP.Package.Health{% endblock %}
+
+{% block hero_type %}is-info{% endblock %}
+{% block hero_title %}Keep your dependencies up-to-date{% endblock %}
+
+{% block hero_subtitle %}Package.Health uses semantic versioning to detect outdated or insecure dependencies in your project's <code>composer.json</code>.{% endblock %}
+
+{% block content %}
+  <h2 class="title is-3">Packages from {{ vendor }}</h2>
+  <table class="table is-fullwidth is-striped is-hoverable">
+    <thead>
+      <tr>
+        <th>Package</th>
+        <th></th>
+        <th class="has-text-right">Status</th>
+      </tr>
+    </thead>
+    <tbody>
+      {% for package in packages %}
+        <tr>
+          <td><a href="{{ url_for('redirectPackage', {vendor: package.vendor, project: package.project}) }}">{{ package.name }}</a></td>
+          <td class="has-text-grey">{{ package.description }}</td>
+          <td class="has-text-right"><img src="{{ url_for('redirectPackageBadge', {vendor: package.vendor, project: package.project}) }}" height="20" alt="Dependency Badge" decoding="async"></td>
+        </tr>
+      {% endfor %}
+    </tbody>
+  </table>
+{% endblock %}

src/Application/Action/Vendor/ListPackagesAction.php

@@ -0,0 +1,66 @@
+<?php
+declare(strict_types = 1);
+
+namespace App\Application\Action\Vendor;
+
+use App\Application\Action\AbstractAction;
+use App\Domain\Package\PackageRepositoryInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Log\LoggerInterface;
+use Slim\HttpCache\CacheProvider;
+use Slim\Views\Twig;
+
+final class ListPackagesAction extends AbstractAction {
+  protected PackageRepositoryInterface $packageRepository;
+
+  public function __construct(
+    LoggerInterface $logger,
+    CacheProvider $cacheProvider,
+    PackageRepositoryInterface $packageRepository
+  ) {
+    parent::__construct($logger, $cacheProvider);
+    $this->packageRepository = $packageRepository;
+  }
+
+  protected function action(): ResponseInterface {
+    $vendor   = $this->resolveStringArg('vendor');
+    $packages = $this->packageRepository->findMatching(['name' => "$vendor/%"]);
+    $twig = Twig::fromRequest($this->request);
+
+    $this->logger->debug('Vendor package list was viewed.');
+
+    // if (count($packages)) {
+    //   $lastModifiedList = array_map(
+    //     function (Package $package): int {
+    //       $lastModified = $package->getUpdatedAt() ?? $package->getCreatedAt();
+
+    //       return $lastModified->getTimestamp();
+    //     },
+    //     $packages
+    //   );
+
+    //   $lastModified = max($lastModifiedList);
+    //   $this->response = $this->cacheProvider->withLastModified(
+    //     $this->response,
+    //     $lastModified
+    //   );
+    //   $this->response = $this->cacheProvider->withEtag(
+    //     $this->response,
+    //     hash('sha1', (string)$lastModified)
+    //   );
+    // }
+
+    return $this->respondWithHtml(
+      $twig->fetch(
+        'vendor/list.twig',
+        [
+          'vendor'   => $vendor,
+          'packages' => $packages,
+          'app'      => [
+            'version' => $_ENV['VERSION']
+          ]
+        ]
+      )
+    );
+  }
+}