source/Build.php

@@ -22,6 +22,7 @@ class Build {
   public $file_size;
   public $file_extension;
   public $release_cycle;
+  public $sha256_checksum; // New property
   public $directory_lister;
 
   public function __construct(string $file_path) {
@@ -83,6 +84,15 @@ class Build {
     $this->file_size = filesize($file_path);
     $this->file_extension = $file_extension;
 
+    // Check for existing .sha256 file.
+    $sha256_file = $file_path . '.sha256';
+    if (file_exists($sha256_file)) {
+        $this->sha256_checksum = trim(str_replace(["\r", "\n", "\t"], '', file_get_contents($sha256_file)));
+    } else {
+        // Compute SHA256 checksum.
+        $this->sha256_checksum = strtoupper(hash_file('sha256', $file_path));
+    }
+    
     // Release cycle.
     //
     // NOTE: Keep it last, so the rule matcher can access all possible

source/BuildsRenderer.php

@@ -8,11 +8,11 @@ class BuildsRenderer {
     $this->builds = $builds;
   }
 
-  public function renderJSON() {
+  public function renderJSON($version = 1) {
     /* Return a JSON formatted list of builds. */
     $builds_json = array();
     foreach ($this->builds as $build) {
-      $builds_json[] = array(
+      $build_data = array(
         'url' => $this->getFileNameURL($build),
         'app' => $build->app,
         'version' => $build->version,
@@ -29,6 +29,16 @@ class BuildsRenderer {
         'file_extension' => $build->file_extension,
         'release_cycle' => $build->release_cycle,
       );
+
+      if ($version == 2) {
+        // If version 2 is requested, skip any .sha256 files and add a checksum key-value entry
+        if (substr($build->file_name, -7) === '.sha256') {
+          continue;
+        }
+        $build_data['checksum'] = $build->sha256_checksum;
+      }
+
+      $builds_json[] = $build_data;
     }
     echo(json_encode($builds_json, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
   }

source/main.php

@@ -16,15 +16,15 @@ function handleNotFoundRequest() {
 function renderDownloadResponseAsJSON($lister) {
   header('Content-Type: application/json; charset=utf-8');
   // Require v=1 to be specified
-  if (!isset($_GET['v']) || $_GET['v'] != '1') {
+  if (!isset($_GET['v']) || ($_GET['v'] != '1' && $_GET['v'] != '2')) {
-    $data = [ 'error' => 'Missing supported format version, for example v=1'];
+    $data = ['error' => 'Invalid version specified. Please provide a supported version using v=1 or v=2.'];
     echo json_encode( $data );
     http_response_code(400);
     return;
   }
   $builds = $lister->getBuilds();
   $renderer = new BuildsRenderer($builds);
-  $renderer->renderJSON();
+  $renderer->renderJSON($_GET['v']);
   return;
 }