<?php
/*************************************************************
# 076 License

Copyright (c) テクニカル諏訪子

Permission is hereby granted to any person obtaining a copy of the software
Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
sublicense, and/or sell copies of the Software, subject to the following conditions:

    1. **Origin Attribution**:
       - You must not misrepresent the origin of the Software; you must not claim
         you created the original Software.
       - If the Software is used in a product, you must either:
         a. Provide clear attribution in the product's documentation, user interface,
            or other visible areas, **OR**
         b. Pay the original developers a fee they specify in writing.
    2. **Usage Restriction**:
       - The Software, or any derivative works, dependencies, or libraries
         incorporating it, must not be used for censorship or to suppress freedom of
         speech, expression, or creativity. Prohibited uses include, but are not
         limited to:
         - Censorship of so-called "hate speech", visuals, non-mainstream opinions,
           ideas, or objective reality.
         - Tools or systems designed to restrict access to information or
           artistic works.
    3. **Notice Preservation**:
       - This license and the above copyright notice must remain intact in all copies
         of the source code.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
namespace Std\Test;

require_once __DIR__.'/../../../autoload.php';

use Std\Lib\Tester;
use Std\Lib\BaseN;
use Std\Lib\Totp;
use Std\Lib\Qr;
use Std\Lib\Image\Png;

$test = new Tester([
  'colorOutput' => true,
  'verboseOutput' => true
]);

$test->describe('Base32・Base64', function($test): void {
  $test->it('RFC 4648の例と同じになるはず', function($test): void {
    $cases = ['' => ['', ''], 'f' => ['MY======', 'Zg=='], 'fo' => ['MZXQ====', 'Zm8='], 'foo' => ['MZXW6===', 'Zm9v'],
              'foob' => ['MZXW6YQ=', 'Zm9vYg=='], 'fooba' => ['MZXW6YTB', 'Zm9vYmE='], 'foobar' => ['MZXW6YTBOI======', 'Zm9vYmFy']];
    foreach ($cases as $in => [$b32, $b64]) {
      $in = (string)$in;
      $test->assertEquals($b32, BaseN::encode32($in), "「{$in}」のBase32");
      $test->assertEquals($b64, BaseN::encode64($in), "「{$in}」のBase64");
      $test->assertEquals($in, BaseN::decode32($b32));
      $test->assertEquals($in, BaseN::decode64($b64));
    }
  });

  $test->it('任意のバイト列を元に戻せて、PHPのbase64と同じになるはず', function($test): void {
    for ($i = 1; $i < 200; $i += 7) {
      $d = random_bytes($i);
      $test->assertEquals(base64_encode($d), BaseN::encode64($d));
      $test->assertEquals($d, BaseN::decode64(BaseN::encode64($d, true, false), true));
      $test->assertEquals($d, BaseN::decode32(BaseN::encode32($d, false)));
    }
    $test->assertEquals(rtrim(strtr(base64_encode("\xfb\xff\xfe"), '+/', '-_'), '='), BaseN::encode64("\xfb\xff\xfe", true, false));
  });

  $test->it('秘密鍵は小文字・空白・ハイフンがあっても読めるはず', function($test): void {
    $test->assertEquals('Hello!', BaseN::decode32('jbsw y3dp-ee'));
  });

  $test->it('不正な文字や長さは例外のはず', function($test): void {
    $test->assertThrows(fn() => BaseN::decode32('ABC1'), \InvalidArgumentException::class);
    $test->assertThrows(fn() => BaseN::decode32('ABC'), \InvalidArgumentException::class);
    $test->assertThrows(fn() => BaseN::decode64('Zm9v!'), \InvalidArgumentException::class);
    $test->assertThrows(fn() => BaseN::decode64('Zm9vY'), \InvalidArgumentException::class);
    $test->assertThrows(fn() => BaseN::decode64('Zm-v', false), \InvalidArgumentException::class);
  });
});

$test->describe('ワンタイムパスワード', function($test): void {
  $test->it('RFC 4226（HOTP）の例と同じになるはず', function($test): void {
    $exp = ['755224', '287082', '359152', '969429', '338314', '254676', '287922', '162583', '399871', '520489'];
    foreach ($exp as $i => $code) $test->assertEquals($code, Totp::hotp('12345678901234567890', $i));
  });

  $test->it('RFC 6238（TOTP）の例と同じになるはず', function($test): void {
    $keys = ['sha1' => '12345678901234567890', 'sha256' => '12345678901234567890123456789012', 'sha512' => str_repeat('1234567890', 6).'1234'];
    $exp = [
      59 => ['94287082', '46119246', '90693936'],
      1111111109 => ['07081804', '68084774', '25091201'],
      1111111111 => ['14050471', '67062674', '99943326'],
      1234567890 => ['89005924', '91819424', '93441116'],
      2000000000 => ['69279037', '90698825', '38618901'],
      20000000000 => ['65353130', '77737706', '47863826'],
    ];
    foreach ($exp as $t => $codes) {
      $i = 0;
      foreach ($keys as $algo => $key) $test->assertEquals($codes[$i++], Totp::code(BaseN::encode32($key), $t, 8, 30, $algo), "{$t}の{$algo}");
    }
  });

  $test->it('前後30秒のずれを認め、同じコードは2度使えないはず', function($test): void {
    $s = Totp::secret();
    $test->assertEquals(32, strlen($s));
    $t = 1700000000;
    $code = Totp::code($s, $t);
    $step = intdiv($t, 30);
    $test->assertEquals($step, Totp::verify($s, $code, -1, $t));
    $test->assertEquals($step, Totp::verify($s, substr($code, 0, 3).' '.substr($code, 3), -1, $t + 30));
    $test->assertNull(Totp::verify($s, $code, -1, $t + 90));
    $test->assertNull(Totp::verify($s, $code, $step, $t));
    $test->assertNull(Totp::verify($s, '12345', -1, $t));
    $test->assertNull(Totp::verify('不正な鍵', '123456', -1, $t));
  });

  $test->it('認証アプリ用のURIを作るはず', function($test): void {
    $test->assertEquals('otpauth://totp/Little%20Beast:suwako?secret=JBSWY3DPEHPK3PXP&issuer=Little%20Beast&algorithm=SHA1&digits=6&period=30',
                        Totp::uri('JBSWY3DPEHPK3PXP', 'suwako', 'Little Beast'));
  });
});

$test->describe('QRコード', function($test): void {
  // OpenCVで読めると確かめたモジュールのMD5（黒が1、行毎）
  $md5 = fn(Qr $q) => md5(implode('', array_map(fn($r) => implode('', array_map(fn($d) => $d ? '1' : '0', $r)), $q->modules)));

  $test->it('型番とモードを選び、他のソフトで読めるのと同じ物を作るはず', function($test) use ($md5): void {
    $cases = [
      ['otpauth://totp/Little%20Beast:suwako?secret=JBSWY3DPEHPK3PXPJBSWY3DPEHPK3PXP&issuer=Little%20Beast&algorithm=SHA1&digits=6&period=30', 'M', 8, '4d0a562a70f409cde3042c6414f73f7f'],
      ['HELLO WORLD', 'Q', 1, 'd63a9f9c0768b31980447c643e266e38'],
      ['01234567', 'H', 1, '08740c4c6bbf74c89a068540444b8a25'],
    ];
    foreach ($cases as [$text, $level, $version, $hash]) {
      $q = new Qr($text, $level);
      $test->assertEquals($version, $q->version);
      $test->assertEquals($version * 4 + 17, $q->size);
      $test->assertEquals($hash, $md5($q));
    }
  });

  $test->it('入る量で型番が決まるはず', function($test): void {
    // 型番1・Lは数字41桁、英数字25文字、バイト17文字まで
    $test->assertEquals(1, (new Qr(str_repeat('7', 41), 'L'))->version);
    $test->assertEquals(2, (new Qr(str_repeat('7', 42), 'L'))->version);
    $test->assertEquals(1, (new Qr(str_repeat('A', 25), 'L'))->version);
    $test->assertEquals(2, (new Qr(str_repeat('A', 26), 'L'))->version);
    $test->assertEquals(1, (new Qr(str_repeat('a', 17), 'L'))->version);
    $test->assertEquals(2, (new Qr(str_repeat('a', 18), 'L'))->version);
    // 型番40・Lは2953バイトまで
    $test->assertEquals(40, (new Qr(str_repeat('a', 2953), 'L'))->version);
    $test->assertThrows(fn() => new Qr(str_repeat('a', 2954), 'L'), \InvalidArgumentException::class);
    $test->assertThrows(fn() => new Qr('a', 'X'), \InvalidArgumentException::class);
  });

  $test->it('位置検出パターンと、正しい形式情報があるはず', function($test): void {
    foreach (['L', 'M', 'Q', 'H'] as $level) {
      $q = new Qr('二段階認証', $level, 7);
      $s = $q->size;
      foreach ([[0, 0], [$s - 7, 0], [0, $s - 7]] as [$x0, $y0]) {
        for ($i = 0; $i < 7; $i++) {
          $test->assertTrue($q->modules[$y0][$x0 + $i] && $q->modules[$y0 + 6][$x0 + $i] && $q->modules[$y0 + 3][$x0 + 3]);
        }
      }
      // 左上の形式情報：レベルとマスクの5ビット＋BCH（マスク0x5412）
      $bits = 0;
      $pos = [[8, 0], [8, 1], [8, 2], [8, 3], [8, 4], [8, 5], [8, 7], [8, 8], [7, 8], [5, 8], [4, 8], [3, 8], [2, 8], [1, 8], [0, 8]];
      foreach ($pos as $i => [$x, $y]) if ($q->modules[$y][$x]) $bits |= 1 << $i;
      $bits ^= 0x5412;
      $data = $bits >> 10;
      $rem = $data;
      for ($i = 0; $i < 10; $i++) $rem = ($rem << 1) ^ (($rem >> 9) * 0x537);
      $test->assertEquals((($data << 10) | $rem) & 0x7fff, $bits, "{$level}の形式情報");
      $test->assertEquals(['L' => 1, 'M' => 0, 'Q' => 3, 'H' => 2][$level], $data >> 3);
      $test->assertEquals($q->mask, $data & 7);
    }
  });

  $test->it('PNGにすると周りに白があり、1モジュールが指定の画素数になるはず', function($test): void {
    $q = new Qr('HELLO WORLD', 'Q');
    $b = (new Png())->decode((new Png())->encode($q->bitmap(3, 4)));
    $test->assertEquals((21 + 8) * 3, $b->width);
    $test->assertEquals([255, 255, 255, 255], $b->get(0, 0));
    $test->assertEquals([0, 0, 0, 255], $b->get(12, 12));
    $test->assertEquals([0, 0, 0, 255], $b->get(14, 14));
  });
});

$test->printSummary();