From 53b5ebcb433334b9dbd50a921178b881f177d691 Mon Sep 17 00:00:00 2001
From: Matthieu Bessat <spamfree@matthieubessat.fr>
Date: Sun, 3 Oct 2021 10:39:21 +0200
Subject: [PATCH] feat(BaseConverter): create module

---
 config.example.php                           |  5 +-
 modules/baseconverter/baseconverter.php      | 95 ++++++++++++++++++++
 modules/baseconverter/baseconverter_help.php | 20 +++++
 3 files changed, 119 insertions(+), 1 deletion(-)
 create mode 100644 modules/baseconverter/baseconverter.php
 create mode 100644 modules/baseconverter/baseconverter_help.php

diff --git a/config.example.php b/config.example.php
index 9570c69..a683c28 100644
--- a/config.example.php
+++ b/config.example.php
@@ -20,7 +20,10 @@ return [
     'logator' => [
       'alias' => ['logme']
     ],
-    'hash' => []
+    'hash' => [],
+    'baseconverter' => [
+      'alias' => ['encode', 'decode']
+    ]
   ],
   'auth' => [
     'root' => 'password'
diff --git a/modules/baseconverter/baseconverter.php b/modules/baseconverter/baseconverter.php
new file mode 100644
index 0000000..a5eb421
--- /dev/null
+++ b/modules/baseconverter/baseconverter.php
@@ -0,0 +1,95 @@
+<?php
+
+header("Content-Type: text/plain");
+
+if (!isset($_GET['data'])) {
+  echo "ERR: Data query param is required";
+  http_response_code(400);
+  exit();
+}
+
+$from = $_GET['from'] ?? 'string';
+$to = $_GET['to'] ?? 'string';
+$input = $_GET['data'];
+$inter = $input;
+
+if ($from === 'string' && $to === 'string') {
+  $to = 'base64';
+}
+
+switch ($from) {
+  case 'base64':
+    $inter = base64_decode($input);
+    break;
+  case 'hex':
+    $inter = hexdec($input);
+    break;
+  case 'hex_str':
+    $inter = pack('H*', $input);
+    break;
+  case 'bin':
+    $inter = bindec($input);
+    break;
+  case 'bin_str':
+    $inter = pack('H*', base_convert($input, 2, 16));
+    break;
+  case 'octal':
+    $inter = octdec($input);
+    break;
+}
+
+if (preg_match('/^base[0-9]+$/m', $from) && $inter === $input) {
+  $fromBase = (int) str_replace('base', '', $from);
+  if ($toBase > 36) {
+    echo "ERR: Can't convert from base strictly superior to 36";
+    http_response_code(400);
+    exit();
+  }
+  $inter = base_convert($input, $fromBase, 10);
+}
+
+$output = $inter;
+switch ($to) {
+  case 'base64':
+    $output = base64_encode($inter);
+    break;
+  case 'dec':
+    $value = unpack('H*', $inter);
+    $output = base_convert($value[1], 16, 10);
+    break;
+  case 'bin':
+    if (is_numeric($inter)) {
+      $output = decbin($inter);
+    } else {
+      $value = unpack('H*', $inter);
+      $output = base_convert($value[1], 16, 2);
+    }
+    break;
+  case 'hex':
+    if (is_numeric($inter)) {
+      $output = dechex($inter);
+    } else {
+      $output = unpack('H*', $inter)[1];
+    }
+    break;
+  case 'octal':
+    if (is_numeric($inter)) {
+      $output = decoct($inter);
+    } else {
+      $value = unpack('H*', $inter);
+      $output = base_convert($value[1], 16, 8);
+    }
+    break;
+}
+
+if (preg_match('/^base[0-9]+$/m', $to) && $output === $inter) {
+  $toBase = (int) str_replace('base', '', $to);
+  if ($toBase > 36) {
+    echo "ERR: Can't convert to base strictly superior to 36";
+    http_response_code(400);
+    exit();
+  }
+  $output = base_convert($input, 10, $toBase);
+}
+
+echo $output;
diff --git a/modules/baseconverter/baseconverter_help.php b/modules/baseconverter/baseconverter_help.php
new file mode 100644
index 0000000..dc0bfde
--- /dev/null
+++ b/modules/baseconverter/baseconverter_help.php
@@ -0,0 +1,20 @@
+<?php
+
+return [
+  'title' => 'Base Converter',
+  'description' => 'Convert from base to base easily',
+  'actions' => [
+    [
+      'name' => 'Convert from base64 to string',
+      'path' => '/?from=base64&data=dGhhdCdzIGNvb2wgaHVoPwo='
+    ],
+    [
+      'name' => 'Convert decimal to hex',
+      'path' => '/?from=hex&data=2a'
+    ],
+    [
+      'name' => 'Convert string to decimal',
+      'path' => '/?to=dec&data=hello'
+    ]
+  ]
+];