Filter projects based on virtual host config

Allow to filter visibility and access to projects based on
Gerrit virtual host configuration.

Default visibility applies to non matching hosts and SSH access.

Change-Id: I14b977b9f6182a4586a777b4fe5b61ed5f2a0fa3
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6143e53
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,22 @@
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
diff --git a/BUILD b/BUILD
new file mode 100644
index 0000000..5d662a0
--- /dev/null
+++ b/BUILD
@@ -0,0 +1,23 @@
+load("//tools/bzl:junit.bzl", "junit_tests")
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "virtualhost",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Implementation-Title: Gerrit Virtual Host lib module",
+        "Implementation-URL: https://github.com/gerritforge/gerrit-virtualhost",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
+
+junit_tests(
+    name = "tests",
+    srcs = glob(["src/test/java/**/*Test.java"]),
+    visibility = ["//visibility:public"],
+    deps = [
+        ":project-vhost__plugin",
+        "//gerrit-acceptance-framework:lib",
+        "//gerrit-plugin-api:lib",
+    ],
+)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8dada3e
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..de12059
--- /dev/null
+++ b/README.md
@@ -0,0 +1,58 @@
+# Gerrit VirtualHost
+
+Gerrit lib module to split the projects' space into virtual hosts
+similarly of what you would do with an HTTP Server and different
+domain names.
+
+## How to build
+
+Build this module as it was a Gerrit plugin:
+
+- Clone Gerrit source tree
+- Clone the virtualhost source tree
+- Link the ```virtualhost``` directory to Gerrit ```/plugins/virtualhost```
+- From Gerrit source tree run ```bazel build plugins/virtualhost```
+- The ```virtualhost.jar``` module is generated under ```/bazel-genfiles/plugins/virtualhost/```
+
+## How install
+
+Copy ```virtualhost.jar``` library to Gerrit ```/lib``` and add the following
+two extra settings to ```gerrit.config```:
+
+```
+[gerrit]
+  installModule = com.gerritforge.gerrit.modules.virtualhost.GuiceModule
+
+[httpd]
+  filterClass = com.gerritforge.gerrit.modules.virtualhost.VirtualHostFilter
+```
+
+## How to define virtual hosts
+
+/etc/virtualhost.config contains the definition of the virtual
+hosts and the set of projects included.
+
+Each ```server``` section defines a virtual host and contains a set of projects
+included. Projects are defined using Gerrit ref-matching expressions and can
+be repeated multiple times to include multiple matchers.
+
+Example to include all the projects starting with ```team1/``` and the ones
+starting with the username:
+
+```
+[server "team1.mycompany.com"]
+  projects = team1/*
+  projects = ${username}/*
+```
+
+## Default host
+
+For all the other server names that are not defined and for SSH access, there
+is a special default section that lists of visible projects.
+
+Example to include all the projects by default:
+
+```
+[default]
+  projects = ^.*
+```
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/CurrentServerName.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/CurrentServerName.java
new file mode 100644
index 0000000..3b2a1a7
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/CurrentServerName.java
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import java.util.Optional;
+
+public class CurrentServerName {
+  private static final ThreadLocal<String> threadLocal = new ThreadLocal<>();
+
+  public static void set(String serverName) {
+    threadLocal.set(serverName);
+  }
+
+  public static Optional<String> get() {
+    return Optional.ofNullable(threadLocal.get());
+  }
+}
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/ForHiddenProject.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/ForHiddenProject.java
new file mode 100644
index 0000000..3a1a3c9
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/ForHiddenProject.java
@@ -0,0 +1,114 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Set;
+
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.permissions.ChangePermissionOrLabel;
+import com.google.gerrit.server.permissions.PermissionBackend.ForChange;
+import com.google.gerrit.server.permissions.PermissionBackend.ForProject;
+import com.google.gerrit.server.permissions.PermissionBackend.ForRef;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.permissions.ProjectPermission;
+import com.google.gerrit.server.permissions.RefPermission;
+import com.google.gerrit.server.query.change.ChangeData;
+
+public class ForHiddenProject extends ForProject {
+  private final ForRef forRef = new HiddenForRef();
+  private final ForChange forChange = new HiddenForChange();
+
+  public static ForHiddenProject INSTANCE = new ForHiddenProject();
+
+  public class HiddenForRef extends ForRef {
+
+    @Override
+    public ForRef user(CurrentUser user) {
+      return this;
+    }
+
+    @Override
+    public ForChange change(ChangeData cd) {
+      return forChange;
+    }
+
+    @Override
+    public ForChange change(ChangeNotes notes) {
+      return forChange;
+    }
+
+    @Override
+    public void check(RefPermission perm) throws AuthException, PermissionBackendException {
+      throwDenied();
+    }
+
+    @Override
+    public Set<RefPermission> test(Collection<RefPermission> permSet) throws PermissionBackendException {
+      return Collections.emptySet();
+    }
+  }
+
+  public class HiddenForChange extends ForChange {
+
+    @Override
+    public CurrentUser user() {
+      return null;
+    }
+
+    @Override
+    public ForChange user(CurrentUser user) {
+      return this;
+    }
+
+    @Override
+    public void check(ChangePermissionOrLabel perm) throws AuthException, PermissionBackendException {
+      throwDenied();
+    }
+
+    @Override
+    public <T extends ChangePermissionOrLabel> Set<T> test(Collection<T> permSet) throws PermissionBackendException {
+      return Collections.emptySet();
+    }
+  }
+
+  @Override
+  public ForProject user(CurrentUser user) {
+    return this;
+  }
+
+  @Override
+  public ForRef ref(String ref) {
+    return forRef;
+  }
+
+  @Override
+  public void check(ProjectPermission perm) throws AuthException, PermissionBackendException {
+    throwDenied();
+  }
+
+  @Override
+  public Set<ProjectPermission> test(Collection<ProjectPermission> permSet) throws PermissionBackendException {
+    return Collections.emptySet();
+  }
+
+  private void throwDenied() throws AuthException {
+    throw new AuthException("Resource does not exist");
+  }
+
+}
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/GuiceModule.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/GuiceModule.java
new file mode 100644
index 0000000..33588f3
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/GuiceModule.java
@@ -0,0 +1,31 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import com.google.gerrit.server.permissions.PermissionBackend;
+import com.google.inject.AbstractModule;
+import com.google.inject.Scopes;
+import com.google.inject.assistedinject.FactoryModuleBuilder;
+
+public class GuiceModule extends AbstractModule {
+
+  @Override
+  protected void configure() {
+    install(new FactoryModuleBuilder().implement(WithVirtualHostUser.class, WithVirtualHostUser.class)
+        .build(WithVirtualHostUser.Factory.class));
+
+    bind(PermissionBackend.class).to(VirtualHostPermissionBackend.class).in(Scopes.SINGLETON);
+  }
+}
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostConfig.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostConfig.java
new file mode 100644
index 0000000..51547fd
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostConfig.java
@@ -0,0 +1,71 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.eclipse.jgit.errors.ConfigInvalidException;
+import org.eclipse.jgit.lib.Config;
+import org.eclipse.jgit.storage.file.FileBasedConfig;
+import org.eclipse.jgit.util.FS;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.gerrit.server.config.SitePaths;
+import com.google.inject.Inject;
+
+public class VirtualHostConfig {
+  private static final Logger log = LoggerFactory.getLogger(VirtualHostConfig.class);
+  private static final String[] EMPTY_PROJECTS_ARRAY = new String[0];
+  private final Config config;
+  private final boolean enabled;
+
+  public final String[] defaultProjects;
+
+  @Inject
+  VirtualHostConfig(SitePaths sitePaths) {
+    File configFile = sitePaths.etc_dir.resolve("virtualhost.config").toFile();
+    FileBasedConfig fileConfig = new FileBasedConfig(configFile, FS.DETECTED);
+    config = fileConfig;
+    try {
+      fileConfig.load();
+    } catch (IOException | ConfigInvalidException e) {
+      log.error("Unable to open or parse " + configFile + ": virtual domains are disabled", e);
+      enabled = false;
+      defaultProjects = new String[0];
+      return;
+    }
+    defaultProjects = config.getStringList("default", null, "projects");
+    enabled = !config.getSubsections("server").isEmpty() || defaultProjects.length > 0;
+  }
+
+  public String[] getProjects(String hostname) {
+    if (!enabled) {
+      return EMPTY_PROJECTS_ARRAY;
+    }
+
+    String[] projects = config.getStringList("server", hostname, "projects");
+    if (projects.length > 0) {
+      return projects;
+    }
+
+    return defaultProjects;
+  }
+
+  public boolean isEnabled() {
+    return enabled;
+  }
+}
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostFilter.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostFilter.java
new file mode 100644
index 0000000..e5decb0
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostFilter.java
@@ -0,0 +1,43 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import java.io.IOException;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+
+public class VirtualHostFilter implements Filter {
+
+  @Override
+  public void init(FilterConfig filterConfig) throws ServletException {
+  }
+
+  @Override
+  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+      throws IOException, ServletException {
+    CurrentServerName.set(((HttpServletRequest) request).getServerName());
+    chain.doFilter(request, response);
+  }
+
+  @Override
+  public void destroy() {
+  }
+}
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostPermissionBackend.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostPermissionBackend.java
new file mode 100644
index 0000000..e3b65c3
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/VirtualHostPermissionBackend.java
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import com.gerritforge.gerrit.modules.virtualhost.WithVirtualHostUser.Factory;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.permissions.PermissionBackend;
+import com.google.inject.Inject;
+
+public class VirtualHostPermissionBackend extends PermissionBackend {
+  private Factory virtualDomainUserFactory;
+
+  @Inject
+  VirtualHostPermissionBackend(WithVirtualHostUser.Factory virtualDomainUserFactory) {
+    this.virtualDomainUserFactory = virtualDomainUserFactory;
+  }
+
+  @Override
+  public WithUser user(CurrentUser user) {
+    return virtualDomainUserFactory.get(user);
+  }
+}
diff --git a/src/main/java/com/gerritforge/gerrit/modules/virtualhost/WithVirtualHostUser.java b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/WithVirtualHostUser.java
new file mode 100644
index 0000000..587287d
--- /dev/null
+++ b/src/main/java/com/gerritforge/gerrit/modules/virtualhost/WithVirtualHostUser.java
@@ -0,0 +1,79 @@
+// Copyright (C) 2017 GerritForge Ltd.
+//
+// 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.gerritforge.gerrit.modules.virtualhost;
+
+import java.util.Collection;
+import java.util.Set;
+
+import com.google.gerrit.extensions.api.access.GlobalOrPluginPermission;
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.reviewdb.client.Project.NameKey;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.permissions.PermissionBackend.ForProject;
+import com.google.gerrit.server.permissions.PermissionBackend.WithUser;
+import com.google.inject.Inject;
+import com.google.inject.assistedinject.Assisted;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.project.DefaultPermissionBackend;
+import com.google.gerrit.server.project.RefPatternMatcher;
+
+public class WithVirtualHostUser extends WithUser {
+  private final CurrentUser user;
+  private final VirtualHostConfig config;
+  private final DefaultPermissionBackend defaultPermissionBackend;
+  private final WithUser wrapped;
+
+  public interface Factory {
+    WithVirtualHostUser get(CurrentUser user);
+  }
+
+  @Inject
+  WithVirtualHostUser(VirtualHostConfig config, DefaultPermissionBackend defaultBackend,
+      @Assisted CurrentUser user) {
+    this.config = config;
+    this.defaultPermissionBackend = defaultBackend;
+    this.user = user;
+    this.wrapped = defaultPermissionBackend.user(user);
+  }
+
+  @Override
+  public ForProject project(NameKey project) {
+    if (!config.isEnabled() || matches(project.get(),
+        CurrentServerName.get().map(config::getProjects).orElse(config.defaultProjects))) {
+      return wrapped.project(project);
+    }
+
+    return ForHiddenProject.INSTANCE;
+  }
+
+  private boolean matches(String project, String[] projectsPatterns) {
+    for (String projectPattern : projectsPatterns) {
+      if (RefPatternMatcher.getMatcher(projectPattern).match(project, user)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @Override
+  public void check(GlobalOrPluginPermission perm) throws AuthException, PermissionBackendException {
+    wrapped.check(perm);
+  }
+
+  @Override
+  public <T extends GlobalOrPluginPermission> Set<T> test(Collection<T> permSet) throws PermissionBackendException {
+    return wrapped.test(permSet);
+  }
+}