/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "src/core/security/base64.h"

#include <string.h>

#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>
#include "test/core/util/test_config.h"

static int
buffers_are_equal (const unsigned char *buf1, const unsigned char *buf2, size_t size)
{
  size_t i;
  for (i = 0; i < size; i++)
    {
      if (buf1[i] != buf2[i])
	{
	  gpr_log (GPR_ERROR, "buf1 and buf2 differ: buf1[%d] = %x vs buf2[%d] = %x", (int) i, buf1[i], (int) i, buf2[i]);
	  return 0;
	}
    }
  return 1;
}

static void
test_simple_encode_decode_b64 (int url_safe, int multiline)
{
  const char *hello = "hello";
  char *hello_b64 = grpc_base64_encode (hello, strlen (hello), url_safe, multiline);
  gpr_slice hello_slice = grpc_base64_decode (hello_b64, url_safe);
  GPR_ASSERT (GPR_SLICE_LENGTH (hello_slice) == strlen (hello));
  GPR_ASSERT (strncmp ((const char *) GPR_SLICE_START_PTR (hello_slice), hello, GPR_SLICE_LENGTH (hello_slice)) == 0);

  gpr_slice_unref (hello_slice);
  gpr_free (hello_b64);
}

static void
test_full_range_encode_decode_b64 (int url_safe, int multiline)
{
  unsigned char orig[256];
  size_t i;
  char *b64;
  gpr_slice orig_decoded;
  for (i = 0; i < sizeof (orig); i++)
    orig[i] = (gpr_uint8) i;

  /* Try all the different paddings. */
  for (i = 0; i < 3; i++)
    {
      b64 = grpc_base64_encode (orig, sizeof (orig) - i, url_safe, multiline);
      orig_decoded = grpc_base64_decode (b64, url_safe);
      GPR_ASSERT (GPR_SLICE_LENGTH (orig_decoded) == (sizeof (orig) - i));
      GPR_ASSERT (buffers_are_equal (orig, GPR_SLICE_START_PTR (orig_decoded), sizeof (orig) - i));
      gpr_slice_unref (orig_decoded);
      gpr_free (b64);
    }
}

static void
test_simple_encode_decode_b64_no_multiline (void)
{
  test_simple_encode_decode_b64 (0, 0);
}

static void
test_simple_encode_decode_b64_multiline (void)
{
  test_simple_encode_decode_b64 (0, 1);
}

static void
test_simple_encode_decode_b64_urlsafe_no_multiline (void)
{
  test_simple_encode_decode_b64 (1, 0);
}

static void
test_simple_encode_decode_b64_urlsafe_multiline (void)
{
  test_simple_encode_decode_b64 (1, 1);
}

static void
test_full_range_encode_decode_b64_no_multiline (void)
{
  test_full_range_encode_decode_b64 (0, 0);
}

static void
test_full_range_encode_decode_b64_multiline (void)
{
  test_full_range_encode_decode_b64 (0, 1);
}

static void
test_full_range_encode_decode_b64_urlsafe_no_multiline (void)
{
  test_full_range_encode_decode_b64 (1, 0);
}

static void
test_full_range_encode_decode_b64_urlsafe_multiline (void)
{
  test_full_range_encode_decode_b64 (1, 1);
}

static void
test_url_safe_unsafe_mismtach_failure (void)
{
  unsigned char orig[256];
  size_t i;
  char *b64;
  gpr_slice orig_decoded;
  int url_safe = 1;
  for (i = 0; i < sizeof (orig); i++)
    orig[i] = (gpr_uint8) i;

  b64 = grpc_base64_encode (orig, sizeof (orig), url_safe, 0);
  orig_decoded = grpc_base64_decode (b64, !url_safe);
  GPR_ASSERT (GPR_SLICE_IS_EMPTY (orig_decoded));
  gpr_free (b64);
  gpr_slice_unref (orig_decoded);

  b64 = grpc_base64_encode (orig, sizeof (orig), !url_safe, 0);
  orig_decoded = grpc_base64_decode (b64, url_safe);
  GPR_ASSERT (GPR_SLICE_IS_EMPTY (orig_decoded));
  gpr_free (b64);
  gpr_slice_unref (orig_decoded);
}

static void
test_rfc4648_test_vectors (void)
{
  char *b64;

  b64 = grpc_base64_encode ("", 0, 0, 0);
  GPR_ASSERT (strcmp ("", b64) == 0);
  gpr_free (b64);

  b64 = grpc_base64_encode ("f", 1, 0, 0);
  GPR_ASSERT (strcmp ("Zg==", b64) == 0);
  gpr_free (b64);

  b64 = grpc_base64_encode ("fo", 2, 0, 0);
  GPR_ASSERT (strcmp ("Zm8=", b64) == 0);
  gpr_free (b64);

  b64 = grpc_base64_encode ("foo", 3, 0, 0);
  GPR_ASSERT (strcmp ("Zm9v", b64) == 0);
  gpr_free (b64);

  b64 = grpc_base64_encode ("foob", 4, 0, 0);
  GPR_ASSERT (strcmp ("Zm9vYg==", b64) == 0);
  gpr_free (b64);

  b64 = grpc_base64_encode ("fooba", 5, 0, 0);
  GPR_ASSERT (strcmp ("Zm9vYmE=", b64) == 0);
  gpr_free (b64);

  b64 = grpc_base64_encode ("foobar", 6, 0, 0);
  GPR_ASSERT (strcmp ("Zm9vYmFy", b64) == 0);
  gpr_free (b64);
}

static void
test_unpadded_decode (void)
{
  gpr_slice decoded;

  decoded = grpc_base64_decode ("Zm9vYmFy", 0);
  GPR_ASSERT (!GPR_SLICE_IS_EMPTY (decoded));
  GPR_ASSERT (gpr_slice_str_cmp (decoded, "foobar") == 0);
  gpr_slice_unref (decoded);

  decoded = grpc_base64_decode ("Zm9vYmE", 0);
  GPR_ASSERT (!GPR_SLICE_IS_EMPTY (decoded));
  GPR_ASSERT (gpr_slice_str_cmp (decoded, "fooba") == 0);
  gpr_slice_unref (decoded);

  decoded = grpc_base64_decode ("Zm9vYg", 0);
  GPR_ASSERT (!GPR_SLICE_IS_EMPTY (decoded));
  GPR_ASSERT (gpr_slice_str_cmp (decoded, "foob") == 0);
  gpr_slice_unref (decoded);

  decoded = grpc_base64_decode ("Zm9v", 0);
  GPR_ASSERT (!GPR_SLICE_IS_EMPTY (decoded));
  GPR_ASSERT (gpr_slice_str_cmp (decoded, "foo") == 0);
  gpr_slice_unref (decoded);

  decoded = grpc_base64_decode ("Zm8", 0);
  GPR_ASSERT (!GPR_SLICE_IS_EMPTY (decoded));
  GPR_ASSERT (gpr_slice_str_cmp (decoded, "fo") == 0);
  gpr_slice_unref (decoded);

  decoded = grpc_base64_decode ("Zg", 0);
  GPR_ASSERT (!GPR_SLICE_IS_EMPTY (decoded));
  GPR_ASSERT (gpr_slice_str_cmp (decoded, "f") == 0);
  gpr_slice_unref (decoded);

  decoded = grpc_base64_decode ("", 0);
  GPR_ASSERT (GPR_SLICE_IS_EMPTY (decoded));
}

int
main (int argc, char **argv)
{
  grpc_test_init (argc, argv);
  test_simple_encode_decode_b64_no_multiline ();
  test_simple_encode_decode_b64_multiline ();
  test_simple_encode_decode_b64_urlsafe_no_multiline ();
  test_simple_encode_decode_b64_urlsafe_multiline ();
  test_full_range_encode_decode_b64_no_multiline ();
  test_full_range_encode_decode_b64_multiline ();
  test_full_range_encode_decode_b64_urlsafe_no_multiline ();
  test_full_range_encode_decode_b64_urlsafe_multiline ();
  test_url_safe_unsafe_mismtach_failure ();
  test_rfc4648_test_vectors ();
  test_unpadded_decode ();
  return 0;
}