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A packaging of the IntelliJ Community Edition platform-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2015 JetBrains s.r.o.
 *
 * 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.
 */
package com.intellij.openapi.vfs.newvfs.impl;

import com.intellij.openapi.Disposable;
import com.intellij.openapi.application.Application;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.application.PathManager;
import com.intellij.openapi.application.impl.ApplicationImpl;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ProjectManager;
import com.intellij.openapi.roots.OrderEnumerator;
import com.intellij.openapi.roots.ProjectRootManager;
import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.util.SystemInfo;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vfs.JarFileSystem;
import com.intellij.openapi.vfs.LocalFileSystem;
import com.intellij.openapi.vfs.VfsUtilCore;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.newvfs.NewVirtualFileSystem;
import com.intellij.util.PathUtil;
import com.intellij.util.SystemProperties;
import com.intellij.util.containers.ContainerUtil;
import gnu.trove.THashSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.TestOnly;

import java.io.File;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Set;

public class VfsRootAccess {
  public static boolean SHOULD_PERFORM_ACCESS_CHECK = System.getenv("NO_FS_ROOTS_ACCESS_CHECK") == null;
  // we don't want test subclasses to accidentally remove allowed files, added by base classes
  private static final Set ourAdditionalRoots = new THashSet(FileUtil.PATH_HASHING_STRATEGY);
  private static boolean insideGettingRoots;

  @TestOnly
  static void assertAccessInTests(@NotNull VirtualFileSystemEntry child, @NotNull NewVirtualFileSystem delegate) {
    final Application application = ApplicationManager.getApplication();
    if (SHOULD_PERFORM_ACCESS_CHECK &&
        application.isUnitTestMode() &&
        application instanceof ApplicationImpl &&
        ((ApplicationImpl)application).isComponentsCreated()) {
      if (delegate != LocalFileSystem.getInstance() && delegate != JarFileSystem.getInstance()) {
        return;
      }

      // root' children are loaded always
      if (child.getParent() == null || child.getParent().getParent() == null) {
        return;
      }

      Set allowed = ApplicationManager.getApplication().runReadAction(new Computable>() {
        @Override
        public Set compute() {
          return allowedRoots();
        }
      });
      boolean isUnder = allowed == null || allowed.isEmpty();

      if (!isUnder) {
        String childPath = child.getPath();
        if (delegate == JarFileSystem.getInstance()) {
          VirtualFile local = JarFileSystem.getInstance().getVirtualFileForJar(child);
          assert local != null : child;
          childPath = local.getPath();
        }
        for (String root : allowed) {
          if (FileUtil.startsWith(childPath, root)) {
            isUnder = true;
            break;
          }
          if (root.startsWith(JarFileSystem.PROTOCOL_PREFIX)) {
            String rootLocalPath = FileUtil.toSystemIndependentName(PathUtil.toPresentableUrl(root));
            isUnder = FileUtil.startsWith(childPath, rootLocalPath);
            if (isUnder) break;
          }
        }
      }

      assert isUnder : "File accessed outside allowed roots: " + child + ";\nAllowed roots: " + new ArrayList(allowed);
    }
  }

  // null means we were unable to get roots, so do not check access
  @Nullable
  @TestOnly
  private static Set allowedRoots() {
    if (insideGettingRoots) return null;

    Project[] openProjects = ProjectManager.getInstance().getOpenProjects();
    if (openProjects.length == 0) return null;

    final Set allowed = new THashSet(FileUtil.PATH_HASHING_STRATEGY);
    allowed.add(FileUtil.toSystemIndependentName(PathManager.getHomePath()));

    try {
      URL outUrl = Application.class.getResource("/");
      if (outUrl != null) {
        String output = new File(outUrl.toURI()).getParentFile().getParentFile().getPath();
        allowed.add(FileUtil.toSystemIndependentName(output));
      }
    }
    catch (URISyntaxException ignored) { }

    String javaHome = SystemProperties.getJavaHome();
    allowed.add(FileUtil.toSystemIndependentName(javaHome));
    if (SystemInfo.isMac && SystemInfo.isAppleJvm) {
      // Apple SDK has jars in the folder _next_ to the java.home
      allowed.add(FileUtil.toSystemIndependentName(new File(new File(javaHome).getParent(), "Classes").getPath()));
    }
    allowed.add(FileUtil.toSystemIndependentName(new File(FileUtil.getTempDirectory()).getParent()));
    allowed.add(FileUtil.toSystemIndependentName(System.getProperty("java.io.tmpdir")));
    allowed.add(FileUtil.toSystemIndependentName(SystemProperties.getUserHome()));

    for (final Project project : openProjects) {
      if (!project.isInitialized()) {
        return null; // all is allowed
      }
      for (VirtualFile root : ProjectRootManager.getInstance(project).getContentRoots()) {
        allowed.add(root.getPath());
      }
      for (VirtualFile root : getAllRoots(project)) {
        allowed.add(StringUtil.trimEnd(root.getPath(), JarFileSystem.JAR_SEPARATOR));
      }
      String location = project.getBasePath();
      assert location != null : project;
      allowed.add(FileUtil.toSystemIndependentName(location));
    }

    allowed.addAll(ourAdditionalRoots);

    return allowed;
  }

  @TestOnly
  private static VirtualFile[] getAllRoots(@NotNull Project project) {
    insideGettingRoots = true;
    final Set roots = new THashSet();

    final OrderEnumerator enumerator = ProjectRootManager.getInstance(project).orderEntries();
    ContainerUtil.addAll(roots, enumerator.getClassesRoots());
    ContainerUtil.addAll(roots, enumerator.getSourceRoots());

    insideGettingRoots = false;
    return VfsUtilCore.toVirtualFileArray(roots);
  }

  @TestOnly
  public static void allowRootAccess(@NotNull String... roots) {
    for (String root : roots) {
      ourAdditionalRoots.add(FileUtil.toSystemIndependentName(root));
    }
  }
  @TestOnly
  public static void allowRootAccessTemporarily(@NotNull Disposable disposable, @NotNull final String... roots) {
    for (String root : roots) {
      ourAdditionalRoots.add(FileUtil.toSystemIndependentName(root));
    }
    Disposer.register(disposable, new Disposable() {
      @Override
      public void dispose() {
        disallowRootAccess(roots);
      }
    });
  }

  @TestOnly
  public static void disallowRootAccess(@NotNull String... roots) {
    for (String root : roots) {
      ourAdditionalRoots.remove(FileUtil.toSystemIndependentName(root));
    }
  }
}