/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "base/file_utils.h"

#include <libgen.h>
#include <stdlib.h>

#include <optional>
#include <vector>

#include "base/stl_util.h"
#include "common_art_test.h"

namespace art {

static constexpr const char kAndroidWifiApexDefaultPath[] = "/apex/com.android.wifi";

namespace {
class ScopedOverrideDalvikCacheSubDirectory {
 public:
  explicit ScopedOverrideDalvikCacheSubDirectory(const char* override) {
    OverrideDalvikCacheSubDirectory(override);
  }

  ~ScopedOverrideDalvikCacheSubDirectory() { OverrideDalvikCacheSubDirectory("dalvik-cache"); }

 private:
  DISALLOW_COPY_AND_ASSIGN(ScopedOverrideDalvikCacheSubDirectory);
};
}  // namespace

class FileUtilsTest : public CommonArtTest {};

TEST_F(FileUtilsTest, GetDalvikCacheFilename) {
  std::string name;
  std::string error;

  EXPECT_TRUE(GetDalvikCacheFilename("/system/app/Foo.apk", "/foo", &name, &error)) << error;
  EXPECT_EQ("/foo/system@app@Foo.apk@classes.dex", name);

  EXPECT_TRUE(GetDalvikCacheFilename("/data/app/foo-1.apk", "/foo", &name, &error)) << error;
  EXPECT_EQ("/foo/data@app@foo-1.apk@classes.dex", name);

  EXPECT_TRUE(GetDalvikCacheFilename("/system/framework/core.jar", "/foo", &name, &error)) << error;
  EXPECT_EQ("/foo/system@framework@core.jar@classes.dex", name);

  EXPECT_TRUE(GetDalvikCacheFilename("/system/framework/boot.art", "/foo", &name, &error)) << error;
  EXPECT_EQ("/foo/system@framework@boot.art", name);

  EXPECT_TRUE(GetDalvikCacheFilename("/system/framework/boot.oat", "/foo", &name, &error)) << error;
  EXPECT_EQ("/foo/system@framework@boot.oat", name);
}

TEST_F(FileUtilsTest, GetSystemImageFilename) {
  EXPECT_STREQ("/system/framework/arm/boot.art",
               GetSystemImageFilename("/system/framework/boot.art", InstructionSet::kArm).c_str());
}

// TODO(dsrbecky): b/160885380: This test is failing in eng-prod because libartbase
//                              is loaded from different path (under testcases).
TEST_F(FileUtilsTest, DISABLED_GetAndroidRootSafe) {
  std::string error_msg;

  // We don't expect null returns for most cases, so don't check and let std::string crash.

  // CommonArtTest sets ANDROID_ROOT, so expect this to be the same.
  std::string android_root = GetAndroidRootSafe(&error_msg);
  std::string android_root_env = getenv("ANDROID_ROOT");
  EXPECT_EQ(android_root, android_root_env) << error_msg;

  // Set ANDROID_ROOT to something else (but the directory must exist). So use dirname.
  UniqueCPtr<char> root_dup(strdup(android_root_env.c_str()));
  char* dir = dirname(root_dup.get());
  ASSERT_EQ(0, setenv("ANDROID_ROOT", dir, /* overwrite */ 1));
  std::string android_root2 = GetAndroidRootSafe(&error_msg);
  EXPECT_STREQ(dir, android_root2.c_str()) << error_msg;

  // Set a bogus value for ANDROID_ROOT. This should be an error.
  ASSERT_EQ(0, setenv("ANDROID_ROOT", "/this/is/obviously/bogus", /* overwrite */ 1));
  EXPECT_EQ(GetAndroidRootSafe(&error_msg), "");
  error_msg = "";

  // Inferring the Android Root from the location of libartbase only works on host.
  if (!kIsTargetBuild) {
    // Unset ANDROID_ROOT and see that it still returns something (as libartbase code is running).
    ASSERT_EQ(0, unsetenv("ANDROID_ROOT"));
    std::string android_root3 = GetAndroidRootSafe(&error_msg);
    // This should be the same as the other root (modulo realpath), otherwise the test setup is
    // broken. On non-bionic. On bionic we can be running with a different libartbase that lives
    // outside of ANDROID_ROOT.
    UniqueCPtr<char> real_root3(realpath(android_root3.c_str(), nullptr));
#if !defined(__BIONIC__) || defined(__ANDROID__)
    UniqueCPtr<char> real_root(realpath(android_root.c_str(), nullptr));
    EXPECT_STREQ(real_root.get(), real_root3.get()) << error_msg;
#else
    EXPECT_STRNE(real_root3.get(), "") << error_msg;
#endif
  }

  // Reset ANDROID_ROOT, as other things may depend on it.
  ASSERT_EQ(0, setenv("ANDROID_ROOT", android_root_env.c_str(), /* overwrite */ 1));
}

TEST_F(FileUtilsTest, GetArtRootSafe) {
  std::string error_msg;
  std::string android_art_root;
  std::string android_art_root_env;

  // TODO(b/130295968): Re-enable this part when the directory exists on host
  if (kIsTargetBuild) {
    // We don't expect null returns for most cases, so don't check and let std::string crash.

    // CommonArtTest sets ANDROID_ART_ROOT, so expect this to be the same.
    android_art_root = GetArtRootSafe(&error_msg);
    android_art_root_env = getenv("ANDROID_ART_ROOT");
    EXPECT_EQ(android_art_root, android_art_root_env) << error_msg;

    // Set ANDROID_ART_ROOT to something else (but the directory must exist). So use dirname.
    UniqueCPtr<char> root_dup(strdup(android_art_root_env.c_str()));
    char* dir = dirname(root_dup.get());
    ASSERT_EQ(0, setenv("ANDROID_ART_ROOT", dir, /* overwrite */ 1));
    std::string android_art_root2 = GetArtRootSafe(&error_msg);
    EXPECT_STREQ(dir, android_art_root2.c_str()) << error_msg;
  }

  // Set a bogus value for ANDROID_ART_ROOT. This should be an error.
  ASSERT_EQ(0, setenv("ANDROID_ART_ROOT", "/this/is/obviously/bogus", /* overwrite */ 1));
  EXPECT_EQ(GetArtRootSafe(&error_msg), "");

  // Inferring the ART root from the location of libartbase only works on target.
  if (kIsTargetBuild) {
    // Disabled for now, as we cannot reliably use `GetRootContainingLibartbase`
    // to find the ART root on target yet (see comment in `GetArtRootSafe`).
    //
    // TODO(b/129534335): Re-enable this part of the test on target when the
    // only instance of libartbase is the one from the ART APEX.
    if ((false)) {
      // Unset ANDROID_ART_ROOT and see that it still returns something (as
      // libartbase code is running).
      ASSERT_EQ(0, unsetenv("ANDROID_ART_ROOT"));
      std::string android_art_root3 = GetArtRootSafe(&error_msg);
      // This should be the same as the other root (modulo realpath), otherwise
      // the test setup is broken. On non-bionic. On bionic we can be running
      // with a different libartbase that lives outside of ANDROID_ART_ROOT.
      UniqueCPtr<char> real_root3(realpath(android_art_root3.c_str(), nullptr));
#if !defined(__BIONIC__) || defined(__ANDROID__)
      UniqueCPtr<char> real_root(realpath(android_art_root.c_str(), nullptr));
      EXPECT_STREQ(real_root.get(), real_root3.get()) << error_msg;
#else
      EXPECT_STRNE(real_root3.get(), "") << error_msg;
#endif
    }
  }

  // Reset ANDROID_ART_ROOT, as other things may depend on it.
  ASSERT_EQ(0, setenv("ANDROID_ART_ROOT", android_art_root_env.c_str(), /* overwrite */ 1));
}

TEST_F(FileUtilsTest, ReplaceFileExtension) {
  EXPECT_EQ("/directory/file.vdex", ReplaceFileExtension("/directory/file.oat", "vdex"));
  EXPECT_EQ("/.directory/file.vdex", ReplaceFileExtension("/.directory/file.oat", "vdex"));
  EXPECT_EQ("/directory/file.vdex", ReplaceFileExtension("/directory/file", "vdex"));
  EXPECT_EQ("/.directory/file.vdex", ReplaceFileExtension("/.directory/file", "vdex"));
}

TEST_F(FileUtilsTest, ArtApexDataPath) {
  ScopedUnsetEnvironmentVariable no_env("ART_APEX_DATA");
  EXPECT_EQ(kArtApexDataDefaultPath, GetArtApexData());

  setenv("ART_APEX_DATA", "/path/from/env", /* overwrite */ 1);
  EXPECT_EQ("/path/from/env", GetArtApexData());
}

TEST_F(FileUtilsTest, GetApexDataOatFilename) {
  ScopedUnsetEnvironmentVariable android_root("ANDROID_ROOT");
  ScopedUnsetEnvironmentVariable i18n_root("ANDROID_I18N_ROOT");
  ScopedUnsetEnvironmentVariable art_apex_data("ART_APEX_DATA");

  EXPECT_EQ(GetArtApexData() + "/dalvik-cache/arm/boot-beep.oat",
            GetApexDataOatFilename("/product/javalib/beep.jar", InstructionSet::kArm));

  const std::string art_apex_jar = std::string {kAndroidArtApexDefaultPath} + "/javalib/some.jar";
  EXPECT_EQ(std::string{}, GetApexDataOatFilename(art_apex_jar, InstructionSet::kArm));

  const std::string i18n_jar = std::string{kAndroidI18nApexDefaultPath} + "/javalib/core-icu4j.jar";
  EXPECT_EQ(std::string{}, GetApexDataOatFilename(i18n_jar, InstructionSet::kArm));

  const std::string system_jar_apexdata_oat = GetArtApexData() + "/dalvik-cache/x86/boot-lace.oat";
  EXPECT_EQ(system_jar_apexdata_oat,
            GetApexDataOatFilename("/system/framework/lace.jar", InstructionSet::kX86));
}

TEST_F(FileUtilsTest, GetApexDataOdexFilename) {
  ScopedUnsetEnvironmentVariable android_root("ANDROID_ROOT");
  ScopedUnsetEnvironmentVariable art_apex_data("ART_APEX_DATA");

  EXPECT_EQ(GetArtApexData() + "/dalvik-cache/arm/data@some@code.odex",
            GetApexDataOdexFilename("/data/some/code.dex", InstructionSet::kArm));

  const std::string art_apex_jar = std::string {kAndroidArtApexDefaultPath} + "/javalib/some.jar";
  EXPECT_EQ(
      GetArtApexData() + "/dalvik-cache/arm/apex@com.android.art@javalib@some.jar@classes.odex",
      GetApexDataOdexFilename(art_apex_jar, InstructionSet::kArm));

  const std::string i18n_jar = std::string{kAndroidI18nApexDefaultPath} + "/javalib/core-icu4j.jar";
  EXPECT_EQ(GetArtApexData() +
                "/dalvik-cache/arm/apex@com.android.i18n@javalib@core-icu4j.jar@classes.odex",
            GetApexDataOdexFilename(i18n_jar, InstructionSet::kArm));

  const std::string system_jar_apexdata_odex =
      GetArtApexData() + "/dalvik-cache/x86/system@framework@cookie.jar@classes.odex";
  EXPECT_EQ(system_jar_apexdata_odex,
            GetApexDataOdexFilename("/system/framework/cookie.jar", InstructionSet::kX86));
}

TEST_F(FileUtilsTest, GetApexDataBootImage) {
  ScopedUnsetEnvironmentVariable android_root("ANDROID_ROOT");
  ScopedUnsetEnvironmentVariable art_apex_data("ART_APEX_DATA");

  EXPECT_EQ(std::string{},
            GetApexDataBootImage(std::string{kAndroidI18nApexDefaultPath} + "/javalib/bar.jar"));

  // Check image location has the prefix "boot-" in front of the basename of dex location and
  // that image suffix is .art.
  const std::string system_jar = "/system/framework/disk.jar";
  const std::string boot_image = GetApexDataBootImage(system_jar);
  EXPECT_EQ(GetArtApexData() + "/dalvik-cache/boot-disk.art", boot_image);

  // Check the image filename corresponds to the oat file for the same system jar.
  const InstructionSet isa = InstructionSet::kArm64;
  const std::string boot_image_filename = GetSystemImageFilename(boot_image.c_str(), isa);
  const std::string accompanying_oat_file = ReplaceFileExtension(boot_image_filename, "oat");
  EXPECT_EQ(accompanying_oat_file, GetApexDataOatFilename(system_jar, isa));
}

TEST_F(FileUtilsTest, GetApexDataImage) {
  ScopedUnsetEnvironmentVariable android_root("ANDROID_ROOT");
  ScopedUnsetEnvironmentVariable art_apex_data("ART_APEX_DATA");

  EXPECT_EQ(
      GetArtApexData() + "/dalvik-cache/apex@com.android.wifi@lib@javalib@bar.jar@classes.art",
      GetApexDataImage(std::string {kAndroidWifiApexDefaultPath} + "/lib/javalib/bar.jar"));

  // Check image has basename of dex location with the .art suffix.
  const char* jar = "/system/framework/mcguffin/test.jar";
  const std::string image = GetApexDataImage(jar);
  EXPECT_EQ(GetArtApexData() + "/dalvik-cache/system@framework@mcguffin@test.jar@classes.art",
            image);

  // Check the image filename corresponds to the .odex file for the same system jar.
  const InstructionSet isa = InstructionSet::kX86_64;
  const std::string image_filename = GetSystemImageFilename(image.c_str(), isa);
  const std::string accompanying_odex_file = ReplaceFileExtension(image_filename, "odex");
  EXPECT_EQ(accompanying_odex_file, GetApexDataOdexFilename(jar, isa));
}

TEST_F(FileUtilsTest, GetApexDataDalvikCacheFilename) {
  const std::string apex_jar = std::string {kAndroidWifiApexDefaultPath} + "/lib/javalib/bar.jar";
  EXPECT_EQ(GetArtApexData() +
                "/dalvik-cache/x86_64/apex@com.android.wifi@lib@javalib@bar.jar@classes.art",
            GetApexDataDalvikCacheFilename(apex_jar, InstructionSet::kX86_64, "art"));

  // Check dalvik-cache filename follows convention.
  const std::string non_apex_jar = "/vendor/javalib/test.jar";
  const std::string art_filename =
      GetApexDataDalvikCacheFilename(non_apex_jar, InstructionSet::kArm, "art");
  CHECK_EQ(GetArtApexData() + "/dalvik-cache/arm/vendor@javalib@test.jar@classes.art",
           art_filename);

  // Check ".art", ".odex" and ".vdex" filenames are the same with the appropriate extensions
  // substituted.
  const std::string odex_filename =
      GetApexDataDalvikCacheFilename(non_apex_jar, InstructionSet::kArm, "odex");
  CHECK_EQ(odex_filename, ReplaceFileExtension(art_filename, "odex"));
  const std::string vdex_filename =
      GetApexDataDalvikCacheFilename(non_apex_jar, InstructionSet::kArm, "vdex");
  CHECK_EQ(vdex_filename, ReplaceFileExtension(art_filename, "vdex"));
}

TEST_F(FileUtilsTest, OverrideDalvikCacheSubDirectory) {
  ScopedUnsetEnvironmentVariable android_root("ANDROID_ROOT");
  ScopedUnsetEnvironmentVariable i18n_root("ANDROID_I18N_ROOT");
  ScopedUnsetEnvironmentVariable art_apex_data("ART_APEX_DATA");

  ScopedOverrideDalvikCacheSubDirectory dalvik_cache("overridden-cache");

  EXPECT_EQ(GetArtApexData() + "/overridden-cache/arm/boot-beep.oat",
            GetApexDataOatFilename("/product/javalib/beep.jar", InstructionSet::kArm));

  EXPECT_EQ(GetArtApexData() + "/overridden-cache/arm/data@some@code.odex",
            GetApexDataOdexFilename("/data/some/code.dex", InstructionSet::kArm));

  const std::string system_jar = "/system/framework/disk.jar";
  const std::string boot_image = GetApexDataBootImage(system_jar);
  EXPECT_EQ(GetArtApexData() + "/overridden-cache/boot-disk.art", boot_image);

  EXPECT_EQ(
      GetArtApexData() + "/overridden-cache/apex@com.android.wifi@lib@javalib@bar.jar@classes.art",
      GetApexDataImage(std::string {kAndroidWifiApexDefaultPath} + "/lib/javalib/bar.jar"));

  const std::string apex_jar = std::string {kAndroidWifiApexDefaultPath} + "/lib/javalib/bar.jar";
  EXPECT_EQ(GetArtApexData() +
                "/overridden-cache/x86_64/apex@com.android.wifi@lib@javalib@bar.jar@classes.art",
            GetApexDataDalvikCacheFilename(apex_jar, InstructionSet::kX86_64, "art"));
}

TEST_F(FileUtilsTest, GetSystemOdexFilenameForApex) {
  ScopedUnsetEnvironmentVariable android_root("ANDROID_ROOT");

  const std::string apex_jar = std::string {kAndroidArtApexDefaultPath} + "/javalib/some.jar";
  EXPECT_EQ(
      GetAndroidRoot() + "/framework/oat/arm/apex@com.android.art@javalib@some.jar@classes.odex",
      GetSystemOdexFilenameForApex(apex_jar, InstructionSet::kArm));
}

TEST_F(FileUtilsTest, ApexNameFromLocation) {
  EXPECT_EQ("", ApexNameFromLocation(""));
  EXPECT_EQ("", ApexNameFromLocation("/apex/com.android.foo"));
  EXPECT_EQ("", ApexNameFromLocation("/apex//something"));
  EXPECT_EQ("com.android.foo", ApexNameFromLocation("/apex/com.android.foo/"));
  EXPECT_EQ("", ApexNameFromLocation("apex/com.android.foo/"));
  EXPECT_EQ("foo", ApexNameFromLocation("/apex/foo/something.jar"));
  EXPECT_EQ("", ApexNameFromLocation("/bar/foo/baz"));
  EXPECT_EQ("", ApexNameFromLocation("/apexx/foo/baz"));
}

}  // namespace art