// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/macros.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "url/url_canon.h"
#include "url/url_canon_stdstring.h"
#include "url/url_parse.h"
#include "url/url_test_utils.h"
#include "url/url_util.h"

namespace url {

TEST(URLUtilTest, FindAndCompareScheme) {
  Component found_scheme;

  // Simple case where the scheme is found and matches.
  const char kStr1[] = "http://www.com/";
  EXPECT_TRUE(FindAndCompareScheme(
      kStr1, static_cast<int>(strlen(kStr1)), "http", NULL));
  EXPECT_TRUE(FindAndCompareScheme(
      kStr1, static_cast<int>(strlen(kStr1)), "http", &found_scheme));
  EXPECT_TRUE(found_scheme == Component(0, 4));

  // A case where the scheme is found and doesn't match.
  EXPECT_FALSE(FindAndCompareScheme(
      kStr1, static_cast<int>(strlen(kStr1)), "https", &found_scheme));
  EXPECT_TRUE(found_scheme == Component(0, 4));

  // A case where there is no scheme.
  const char kStr2[] = "httpfoobar";
  EXPECT_FALSE(FindAndCompareScheme(
      kStr2, static_cast<int>(strlen(kStr2)), "http", &found_scheme));
  EXPECT_TRUE(found_scheme == Component());

  // When there is an empty scheme, it should match the empty scheme.
  const char kStr3[] = ":foo.com/";
  EXPECT_TRUE(FindAndCompareScheme(
      kStr3, static_cast<int>(strlen(kStr3)), "", &found_scheme));
  EXPECT_TRUE(found_scheme == Component(0, 0));

  // But when there is no scheme, it should fail.
  EXPECT_FALSE(FindAndCompareScheme("", 0, "", &found_scheme));
  EXPECT_TRUE(found_scheme == Component());

  // When there is a whitespace char in scheme, it should canonicalize the url
  // before comparison.
  const char whtspc_str[] = " \r\n\tjav\ra\nscri\tpt:alert(1)";
  EXPECT_TRUE(FindAndCompareScheme(whtspc_str,
                                   static_cast<int>(strlen(whtspc_str)),
                                   "javascript", &found_scheme));
  EXPECT_TRUE(found_scheme == Component(1, 10));

  // Control characters should be stripped out on the ends, and kept in the
  // middle.
  const char ctrl_str[] = "\02jav\02scr\03ipt:alert(1)";
  EXPECT_FALSE(FindAndCompareScheme(ctrl_str,
                                    static_cast<int>(strlen(ctrl_str)),
                                    "javascript", &found_scheme));
  EXPECT_TRUE(found_scheme == Component(1, 11));
}

TEST(URLUtilTest, ReplaceComponents) {
  Parsed parsed;
  RawCanonOutputT<char> output;
  Parsed new_parsed;

  // Check that the following calls do not cause crash
  Replacements<char> replacements;
  replacements.SetRef("test", Component(0, 4));
  ReplaceComponents(NULL, 0, parsed, replacements, NULL, &output, &new_parsed);
  ReplaceComponents("", 0, parsed, replacements, NULL, &output, &new_parsed);
  replacements.ClearRef();
  replacements.SetHost("test", Component(0, 4));
  ReplaceComponents(NULL, 0, parsed, replacements, NULL, &output, &new_parsed);
  ReplaceComponents("", 0, parsed, replacements, NULL, &output, &new_parsed);

  replacements.ClearHost();
  ReplaceComponents(NULL, 0, parsed, replacements, NULL, &output, &new_parsed);
  ReplaceComponents("", 0, parsed, replacements, NULL, &output, &new_parsed);
  ReplaceComponents(NULL, 0, parsed, replacements, NULL, &output, &new_parsed);
  ReplaceComponents("", 0, parsed, replacements, NULL, &output, &new_parsed);
}

static std::string CheckReplaceScheme(const char* base_url,
                                      const char* scheme) {
  // Make sure the input is canonicalized.
  RawCanonOutput<32> original;
  Parsed original_parsed;
  Canonicalize(base_url, strlen(base_url), true, NULL, &original,
               &original_parsed);

  Replacements<char> replacements;
  replacements.SetScheme(scheme, Component(0, strlen(scheme)));

  std::string output_string;
  StdStringCanonOutput output(&output_string);
  Parsed output_parsed;
  ReplaceComponents(original.data(), original.length(), original_parsed,
                    replacements, NULL, &output, &output_parsed);

  output.Complete();
  return output_string;
}

TEST(URLUtilTest, ReplaceScheme) {
  EXPECT_EQ("https://google.com/",
            CheckReplaceScheme("http://google.com/", "https"));
  EXPECT_EQ("file://google.com/",
            CheckReplaceScheme("http://google.com/", "file"));
  EXPECT_EQ("http://home/Build",
            CheckReplaceScheme("file:///Home/Build", "http"));
  EXPECT_EQ("javascript:foo",
            CheckReplaceScheme("about:foo", "javascript"));
  EXPECT_EQ("://google.com/",
            CheckReplaceScheme("http://google.com/", ""));
  EXPECT_EQ("http://google.com/",
            CheckReplaceScheme("about:google.com", "http"));
  EXPECT_EQ("http:", CheckReplaceScheme("", "http"));

#ifdef WIN32
  // Magic Windows drive letter behavior when converting to a file URL.
  EXPECT_EQ("file:///E:/foo/",
            CheckReplaceScheme("http://localhost/e:foo/", "file"));
#endif

  // This will probably change to "about://google.com/" when we fix
  // http://crbug.com/160 which should also be an acceptable result.
  EXPECT_EQ("about://google.com/",
            CheckReplaceScheme("http://google.com/", "about"));

  EXPECT_EQ("http://example.com/%20hello%20# world",
            CheckReplaceScheme("myscheme:example.com/ hello # world ", "http"));
}

TEST(URLUtilTest, DecodeURLEscapeSequences) {
  struct DecodeCase {
    const char* input;
    const char* output;
  } decode_cases[] = {
    {"hello, world", "hello, world"},
    {"%01%02%03%04%05%06%07%08%09%0a%0B%0C%0D%0e%0f/",
     "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0B\x0C\x0D\x0e\x0f/"},
    {"%10%11%12%13%14%15%16%17%18%19%1a%1B%1C%1D%1e%1f/",
     "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1B\x1C\x1D\x1e\x1f/"},
    {"%20%21%22%23%24%25%26%27%28%29%2a%2B%2C%2D%2e%2f/",
     " !\"#$%&'()*+,-.//"},
    {"%30%31%32%33%34%35%36%37%38%39%3a%3B%3C%3D%3e%3f/",
     "0123456789:;<=>?/"},
    {"%40%41%42%43%44%45%46%47%48%49%4a%4B%4C%4D%4e%4f/",
     "@ABCDEFGHIJKLMNO/"},
    {"%50%51%52%53%54%55%56%57%58%59%5a%5B%5C%5D%5e%5f/",
     "PQRSTUVWXYZ[\\]^_/"},
    {"%60%61%62%63%64%65%66%67%68%69%6a%6B%6C%6D%6e%6f/",
     "`abcdefghijklmno/"},
    {"%70%71%72%73%74%75%76%77%78%79%7a%7B%7C%7D%7e%7f/",
     "pqrstuvwxyz{|}~\x7f/"},
    // Test un-UTF-8-ization.
    {"%e4%bd%a0%e5%a5%bd", "\xe4\xbd\xa0\xe5\xa5\xbd"},
  };

  for (size_t i = 0; i < arraysize(decode_cases); i++) {
    const char* input = decode_cases[i].input;
    RawCanonOutputT<base::char16> output;
    DecodeURLEscapeSequences(input, strlen(input), &output);
    EXPECT_EQ(decode_cases[i].output,
              test_utils::ConvertUTF16ToUTF8(base::string16(output.data(),
                                                            output.length())));
  }

  // Our decode should decode %00
  const char zero_input[] = "%00";
  RawCanonOutputT<base::char16> zero_output;
  DecodeURLEscapeSequences(zero_input, strlen(zero_input), &zero_output);
  EXPECT_NE("%00", test_utils::ConvertUTF16ToUTF8(
      base::string16(zero_output.data(), zero_output.length())));

  // Test the error behavior for invalid UTF-8.
  const char invalid_input[] = "%e4%a0%e5%a5%bd";
  const base::char16 invalid_expected[4] = {0x00e4, 0x00a0, 0x597d, 0};
  RawCanonOutputT<base::char16> invalid_output;
  DecodeURLEscapeSequences(invalid_input, strlen(invalid_input),
                           &invalid_output);
  EXPECT_EQ(base::string16(invalid_expected),
            base::string16(invalid_output.data(), invalid_output.length()));
}

TEST(URLUtilTest, TestEncodeURIComponent) {
  struct EncodeCase {
    const char* input;
    const char* output;
  } encode_cases[] = {
    {"hello, world", "hello%2C%20world"},
    {"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F",
     "%01%02%03%04%05%06%07%08%09%0A%0B%0C%0D%0E%0F"},
    {"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F",
     "%10%11%12%13%14%15%16%17%18%19%1A%1B%1C%1D%1E%1F"},
    {" !\"#$%&'()*+,-./",
     "%20!%22%23%24%25%26%27()*%2B%2C-.%2F"},
    {"0123456789:;<=>?",
     "0123456789%3A%3B%3C%3D%3E%3F"},
    {"@ABCDEFGHIJKLMNO",
     "%40ABCDEFGHIJKLMNO"},
    {"PQRSTUVWXYZ[\\]^_",
     "PQRSTUVWXYZ%5B%5C%5D%5E_"},
    {"`abcdefghijklmno",
     "%60abcdefghijklmno"},
    {"pqrstuvwxyz{|}~\x7f",
     "pqrstuvwxyz%7B%7C%7D~%7F"},
  };

  for (size_t i = 0; i < arraysize(encode_cases); i++) {
    const char* input = encode_cases[i].input;
    RawCanonOutputT<char> buffer;
    EncodeURIComponent(input, strlen(input), &buffer);
    std::string output(buffer.data(), buffer.length());
    EXPECT_EQ(encode_cases[i].output, output);
  }
}

TEST(URLUtilTest, TestResolveRelativeWithNonStandardBase) {
  // This tests non-standard (in the sense that GIsStandard() == false)
  // hierarchical schemes.
  struct ResolveRelativeCase {
    const char* base;
    const char* rel;
    bool is_valid;
    const char* out;
  } resolve_non_standard_cases[] = {
      // Resolving a relative path against a non-hierarchical URL should fail.
    {"scheme:opaque_data", "/path", false, ""},
      // Resolving a relative path against a non-standard authority-based base
      // URL doesn't alter the authority section.
    {"scheme://Authority/", "../path", true, "scheme://Authority/path"},
      // A non-standard hierarchical base is resolved with path URL
      // canonicalization rules.
    {"data:/Blah:Blah/", "file.html", true, "data:/Blah:Blah/file.html"},
    {"data:/Path/../part/part2", "file.html", true,
      "data:/Path/../part/file.html"},
      // Path URL canonicalization rules also apply to non-standard authority-
      // based URLs.
    {"custom://Authority/", "file.html", true,
      "custom://Authority/file.html"},
    {"custom://Authority/", "other://Auth/", true, "other://Auth/"},
    {"custom://Authority/", "../../file.html", true,
      "custom://Authority/file.html"},
    {"custom://Authority/path/", "file.html", true,
      "custom://Authority/path/file.html"},
    {"custom://Authority:NoCanon/path/", "file.html", true,
      "custom://Authority:NoCanon/path/file.html"},
      // It's still possible to get an invalid path URL.
    {"custom://Invalid:!#Auth/", "file.html", false, ""},
      // A path with an authority section gets canonicalized under standard URL
      // rules, even though the base was non-standard.
    {"content://content.Provider/", "//other.Provider", true,
      "content://other.provider/"},
      // Resolving an absolute URL doesn't cause canonicalization of the
      // result.
    {"about:blank", "custom://Authority", true, "custom://Authority"},
      // Fragment URLs can be resolved against a non-standard base.
    {"scheme://Authority/path", "#fragment", true,
      "scheme://Authority/path#fragment"},
    {"scheme://Authority/", "#fragment", true, "scheme://Authority/#fragment"},
      // Resolving should fail if the base URL is authority-based but is
      // missing a path component (the '/' at the end).
    {"scheme://Authority", "path", false, ""},
      // Test resolving a fragment (only) against any kind of base-URL.
    {"about:blank", "#id42", true, "about:blank#id42" },
    {"about:blank", " #id42", true, "about:blank#id42" },
    {"about:blank#oldfrag", "#newfrag", true, "about:blank#newfrag" },
      // A surprising side effect of allowing fragments to resolve against
      // any URL scheme is we might break javascript: URLs by doing so...
    {"javascript:alert('foo#bar')", "#badfrag", true,
      "javascript:alert('foo#badfrag" },
      // In this case, the backslashes will not be canonicalized because it's a
      // non-standard URL, but they will be treated as a path separators,
      // giving the base URL here a path of "\".
      //
      // The result here is somewhat arbitrary. One could argue it should be
      // either "aaa://a\" or "aaa://a/" since the path is being replaced with
      // the "current directory". But in the context of resolving on data URLs,
      // adding the requested dot doesn't seem wrong either.
    {"aaa://a\\", "aaa:.", true, "aaa://a\\." }
  };

  for (size_t i = 0; i < arraysize(resolve_non_standard_cases); i++) {
    const ResolveRelativeCase& test_data = resolve_non_standard_cases[i];
    Parsed base_parsed;
    ParsePathURL(test_data.base, strlen(test_data.base), false, &base_parsed);

    std::string resolved;
    StdStringCanonOutput output(&resolved);
    Parsed resolved_parsed;
    bool valid = ResolveRelative(test_data.base, strlen(test_data.base),
                                 base_parsed, test_data.rel,
                                 strlen(test_data.rel), NULL, &output,
                                 &resolved_parsed);
    output.Complete();

    EXPECT_EQ(test_data.is_valid, valid) << i;
    if (test_data.is_valid && valid)
      EXPECT_EQ(test_data.out, resolved) << i;
  }
}

TEST(URLUtilTest, TestNoRefComponent) {
  // The hash-mark must be ignored when mailto: scheme is
  // parsed, even if the url has a base and relative part.
  const char* base = "mailto://to/";
  const char* rel = "any#body";

  Parsed base_parsed;
  ParsePathURL(base, strlen(base), false, &base_parsed);

  std::string resolved;
  StdStringCanonOutput output(&resolved);
  Parsed resolved_parsed;

  bool valid = ResolveRelative(base, strlen(base),
                               base_parsed, rel,
                               strlen(rel), NULL, &output,
                               &resolved_parsed);
  EXPECT_TRUE(valid);
  EXPECT_FALSE(resolved_parsed.ref.is_valid());
}

}  // namespace url