Add encrypted day storage and personal backups

src/Domain/EntryRepository.php

@@ -4,6 +4,13 @@ declare(strict_types=1);
 
 final class EntryRepository
 {
+    private EntryCrypto $crypto;
+
+    public function __construct()
+    {
+        $this->crypto = new EntryCrypto();
+    }
+
     public function save(string $username, string $date, array $entry, array $evaluation): void
     {
         $path = $this->pathFor($username, $date);
@@ -13,7 +20,8 @@ final class EntryRepository
             mkdir($directory, 0775, true);
         }
 
-        file_put_contents($path, $this->toMarkdown($username, $date, $entry, $evaluation));
+        $markdown = $this->toMarkdown($username, $date, $entry, $evaluation);
+        file_put_contents($path, $this->crypto->encrypt($markdown), LOCK_EX);
     }
 
     public function find(string $username, string $date): ?array
@@ -24,7 +32,14 @@ final class EntryRepository
             return null;
         }
 
-        return $this->parse((string) file_get_contents($path), $date);
+        $content = (string) file_get_contents($path);
+        $plaintext = $this->crypto->decrypt($content);
+
+        if ($this->crypto->shouldEncrypt() && !$this->crypto->isEncrypted($content)) {
+            file_put_contents($path, $this->crypto->encrypt($plaintext), LOCK_EX);
+        }
+
+        return $this->parse($plaintext, $date);
     }
 
     public function all(string $username): array
@@ -41,7 +56,14 @@ final class EntryRepository
         $entries = [];
         foreach ($files as $file) {
             $date = basename($file, '.txt');
-            $parsed = $this->parse((string) file_get_contents($file), $date);
+            $content = (string) file_get_contents($file);
+            $plaintext = $this->crypto->decrypt($content);
+
+            if ($this->crypto->shouldEncrypt() && !$this->crypto->isEncrypted($content)) {
+                file_put_contents($file, $this->crypto->encrypt($plaintext), LOCK_EX);
+            }
+
+            $parsed = $this->parse($plaintext, $date);
             if ($parsed !== null) {
                 $entries[] = $parsed;
             }
@@ -50,6 +72,18 @@ final class EntryRepository
         return $entries;
     }
 
+    public function parseMarkdown(string $content, string $fallbackDate): ?array
+    {
+        $plaintext = $this->crypto->decrypt($content);
+
+        return $this->parse($plaintext, $fallbackDate);
+    }
+
+    public function exportMarkdown(string $username, string $date, array $entry, array $evaluation): string
+    {
+        return $this->toMarkdown($username, $date, $entry, $evaluation);
+    }
+
     private function directoryFor(string $username): string
     {
         return storage_path('users/' . normalize_username($username) . '/days');