Merge "Add REST endpoint to get info about server configuration"

Documentation/rest-api-config.txt

@@ -30,6 +30,87 @@ Returns the version of the Gerrit server.
   "2.7"
 ----
 
+[[get-info]]
+=== Get Server Info
+--
+'GET /config/server/info'
+--
+
+Returns the information about the Gerrit server configuration.
+
+.Request
+----
+  GET /config/server/info HTTP/1.0
+----
+
+As result a link:#server-info[ServerInfo] entity is returned.
+
+.Response
+----
+  HTTP/1.1 200 OK
+  Content-Type: application/json; charset=UTF-8
+
+  )]}'
+  {
+    "auth": {
+      "auth_type": "LDAP",
+      "editable_account_fields": [
+        "FULL_NAME",
+        "REGISTER_NEW_EMAIL"
+      ]
+    },
+    "download": {
+      "schemes": [
+        {
+          "name": "ssh",
+          "url": "ssh://jdoe@gerrithost:29418/${project}",
+          "is_auth_required": true,
+          "is_auth_supported": true,
+          "commands": {
+            "Checkout": "git fetch ssh://jdoe@gerrithost:29418/${project} ${ref} \u0026\u0026 git checkout FETCH_HEAD",
+            "Format Patch": "git fetch ssh://jdoe@gerrithost:29418/${project} ${ref} \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD",
+            "Pull": "git pull ssh://jdoe@gerrithost:29418/${project} ${ref}",
+            "Cherry Pick": "git fetch ssh://jdoe@gerrithost:29418/${project} ${ref} \u0026\u0026 git cherry-pick FETCH_HEAD"
+          }
+        },
+        {
+          "name": "http",
+          "url": "http://jdoe@gerrithost:8080/${project}",
+          "is_auth_required": true,
+          "is_auth_supported": true,
+          "commands": {
+            "Checkout": "git fetch http://jdoe@gerrithost:8080/${project} ${ref} \u0026\u0026 git checkout FETCH_HEAD",
+            "Format Patch": "git fetch http://jdoe@gerrithost:8080/${project} ${ref} \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD",
+            "Pull": "git pull http://jdoe@gerrithost:8080/${project} ${ref}",
+            "Cherry Pick": "git fetch http://jdoe@gerrithost:8080/${project} ${ref} \u0026\u0026 git cherry-pick FETCH_HEAD"
+          }
+        },
+        {
+          "name": "anonymous http",
+          "url": "http://gerrithost:8080/${project}",
+          "commands": {
+            "Checkout": "git fetch http://gerrithost:8080/${project} ${ref} \u0026\u0026 git checkout FETCH_HEAD",
+            "Format Patch": "git fetch http://gerrithost:8080/${project} ${ref} \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD",
+            "Pull": "git pull http://gerrithost:8080/${project} ${ref}",
+            "Cherry Pick": "git fetch http://gerrithost:8080/${project} ${ref} \u0026\u0026 git cherry-pick FETCH_HEAD"
+          }
+        }
+      ],
+      "archives": [
+        "TGZ",
+        "TAR",
+        "TBZ2",
+        "TXZ"
+      ]
+    },
+    "gerrit": {
+      "all_projects": "All-Projects",
+      "all_users": "All-Users"
+    }
+  }
+----
+
+
 [[list-caches]]
 === List Caches
 --
@@ -822,6 +903,27 @@ The ID of the task (hex string).
 [[json-entities]]
 == JSON Entities
 
+[[auth-info]]
+=== AuthInfo
+The `AuthInfo` entity contains information about the authentication
+configuration of the Gerrit server.
+
+[options="header",cols="1,^1,5"]
+|==========================================
+|Field Name                   ||Description
+|`type`                       ||
+The link:config-gerrit.html#auth.type[authentication type] that is
+configured on the server. Can be `OPENID`, `OPENID_SSO`, `OAUTH`,
+`HTTP`, `HTTP_LDAP`, `CLIENT_SSL_CERT_LDAP`, `LDAP`, `LDAP_BIND`,
+`CUSTOM_EXTENSION` or `DEVELOPMENT_BECOME_ANY_ACCOUNT`.
+|`use_contributor_agreements` |not set if `false`|
+Whether link:config-gerrit.html#auth.contributorAgreements[contributor
+agreements] are required.
+|`editable_account_fields`    ||
+List of account fields that are editable. Possible values are
+`FULL_NAME`, `USER_NAME` and `REGISTER_NEW_EMAIL`.
+|==========================================
+
 [[cache-info]]
 === CacheInfo
 The `CacheInfo` entity contains information about a cache.
@@ -878,6 +980,60 @@ The `CapabilityInfo` entity contains information about a capability.
 |`name`               |capability name
 |=================================
 
+[[contact-store-info]]
+=== ContactStoreInfo
+The `ContactStoreInfo` entity contains information about the contact
+store.
+
+[options="header",cols="1,6"]
+|=======================
+|Field Name |Description
+|`url`      |
+The link:config-gerrit.html#contactstore.url[URL of the contact store].
+|=======================
+
+[[download-info]]
+=== DownloadInfo
+The `DownloadInfo` entity contains information about supported download
+options.
+
+[options="header",cols="1,6"]
+|=======================
+|Field Name |Description
+|`schemes`  |
+The supported download schemes as list of link:#download-scheme-info[
+DownloadSchemeInfo] entities.
+|`archives` |
+List of supported archive formats. Possible values are `TGZ`, `TAR`,
+`TBZ2` and `TXZ`.
+|=======================
+
+[[download-scheme-info]]
+=== DownloadSchemeInfo
+The `DownloadSchemeInfo` entity contains information about a supported
+download scheme and its commands.
+
+[options="header",cols="1,^1,5"]
+|=================================
+|Field Name          ||Description
+|`name`              ||
+The name of the download scheme.
+|`url`               ||
+The URL of the download scheme, where '${project}' is used as
+placeholder for the project name.
+|`is_auth_required`  |not set if `false`|
+Whether this download scheme requires authentication.
+|`is_auth_supported` |not set if `false`|
+Whether this download scheme supports authentication.
+|`commands`          ||
+List of download commands, where  '${project}' is used as
+placeholder for the project name, and '${ref}' is used as
+placeholder for the (change) ref.
+
+Empty, if accessed anonymously and the download scheme requires
+authentication.
+|=================================
+
 [[entries-info]]
 === EntriesInfo
 The `EntriesInfo` entity contains information about the entries in a
@@ -896,6 +1052,21 @@ with a unit abbreviation (`k`: kilobytes, `m`: megabytes,
 `g`: gigabytes). Only set for disk caches.
 |==================================
 
+[[gerrit-info]]
+=== GerritInfo
+The `GerritInfo` entity contains information about Gerrit
+configuration from the link:config-gerrit.html#gerrit[gerrit] section.
+
+[options="header",cols="1,6"]
+|================================
+|Field Name          |Description
+|`all_projects_name` |
+Name of the link:config-gerrit.html#gerrit.allProjects[root project].
+|`all_users_name`    |
+Name of the link:config-gerrit.html#gerrit.allUsers[project in which
+meta data of all users is stored].
+|================================
+
 [[hit-ration-info]]
 === HitRatioInfo
 The `HitRatioInfo` entity contains information about the hit ratio of a
@@ -958,6 +1129,30 @@ The maximal memory size. The value is returned with a unit abbreviation
 The number of open files.
 |============================
 
+[[server-info]]
+=== ServerInfo
+The `ServerInfo` entity contains information about the configuration of
+the Gerrit server.
+
+[options="header",cols="1,^1,5"]
+|=======================================
+|Field Name                ||Description
+|`auth`                    ||
+Information about the authentication configuration as
+link:#auth-info[AuthInfo] entity.
+|`contact_store`           |optional|
+Information about the contact store configuration as
+link:#contact-store-info[ContactStoreInfo] entity.
+|`download`                ||
+Information about the configured download options as
+link:#download-info[DownloadInfo] entity.
+information about Gerrit
+|`gerrit`                  ||
+Information about the configuration from the
+link:config-gerrit.html#gerrit[gerrit] section as link:#gerrit-info[
+GerritInfo] entity.
+|=======================================
+
 [[summary-info]]
 === SummaryInfo
 The `SummaryInfo` entity contains information about the current state

gerrit-httpd/src/main/java/com/google/gerrit/httpd/GerritConfigProvider.java

@@ -20,7 +20,6 @@ import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.gerrit.common.data.GerritConfig;
 import com.google.gerrit.common.data.GitwebConfig;
-import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.server.account.Realm;
 import com.google.gerrit.server.change.ArchiveFormat;
 import com.google.gerrit.server.change.GetArchive;
@@ -31,7 +30,6 @@ import com.google.gerrit.server.config.ConfigUtil;
 import com.google.gerrit.server.config.DownloadConfig;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.contact.ContactStore;
-import com.google.gerrit.server.mail.EmailSender;
 import com.google.gerrit.server.ssh.SshInfo;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
@@ -40,8 +38,6 @@ import com.google.inject.ProvisionException;
 import org.eclipse.jgit.lib.Config;
 
 import java.net.MalformedURLException;
-import java.util.HashSet;
-import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
 import javax.servlet.ServletContext;
@@ -56,7 +52,6 @@ class GerritConfigProvider implements Provider<GerritConfig> {
   private final AllProjectsName wildProject;
   private final SshInfo sshInfo;
 
-  private EmailSender emailSender;
   private final ContactStore contactStore;
   private final ServletContext servletContext;
   private final String anonymousCowardName;
@@ -81,11 +76,6 @@ class GerritConfigProvider implements Provider<GerritConfig> {
     anonymousCowardName = acn;
   }
 
-  @Inject(optional = true)
-  void setEmailSender(final EmailSender d) {
-    emailSender = d;
-  }
-
   private GerritConfig create() throws MalformedURLException {
     final GerritConfig config = new GerritConfig();
     switch (authConfig.getAuthType()) {
@@ -118,8 +108,7 @@ class GerritConfigProvider implements Provider<GerritConfig> {
         break;
     }
     config.setSwitchAccountUrl(cfg.getString("auth", null, "switchAccountUrl"));
-    config.setUseContributorAgreements(cfg.getBoolean("auth",
+    config.setUseContributorAgreements(authConfig.isUseContributorAgreements());
-        "contributoragreements", false));
     config.setGitDaemonUrl(cfg.getString("gerrit", null, "canonicalgiturl"));
     config.setGitHttpUrl(cfg.getString("gerrit", null, "gitHttpUrl"));
     config.setUseContactInfo(contactStore != null && contactStore.isEnabled());
@@ -146,17 +135,7 @@ class GerritConfigProvider implements Provider<GerritConfig> {
     config.setReportBugUrl(cfg.getString("gerrit", null, "reportBugUrl"));
     config.setReportBugText(cfg.getString("gerrit", null, "reportBugText"));
 
-    Set<Account.FieldName> fields = new HashSet<>();
+    config.setEditableAccountFields(realm.getEditableFields());
-    for (Account.FieldName n : Account.FieldName.values()) {
-      if (realm.allowsEdit(n)) {
-        if (n == Account.FieldName.REGISTER_NEW_EMAIL
-            && (emailSender == null || !emailSender.isEnabled())) {
-          continue;
-        }
-        fields.add(n);
-      }
-    }
-    config.setEditableAccountFields(fields);
 
     if (gitWebConfig.getUrl() != null) {
       config.setGitwebLink(new GitwebConfig(gitWebConfig.getUrl(), gitWebConfig

gerrit-server/src/main/java/com/google/gerrit/server/account/AbstractRealm.java

@@ -16,15 +16,44 @@ package com.google.gerrit.server.account;
 
 import com.google.common.base.Strings;
 import com.google.common.collect.Sets;
+import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.reviewdb.client.AccountExternalId;
+import com.google.gerrit.reviewdb.client.Account.FieldName;
 import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.mail.EmailSender;
+import com.google.inject.Inject;
 
 import java.util.Collection;
+import java.util.HashSet;
 import java.util.Objects;
 import java.util.Set;
 
 /** Basic implementation of {@link Realm}.  */
 public abstract class AbstractRealm implements Realm {
+  private EmailSender emailSender;
+
+  @Inject(optional = true)
+  void setEmailSender(EmailSender emailSender) {
+    this.emailSender = emailSender;
+  }
+
+  @Override
+  public Set<FieldName> getEditableFields() {
+    Set<Account.FieldName> fields = new  HashSet<>();
+    for (Account.FieldName n : Account.FieldName.values()) {
+      if (allowsEdit(n)) {
+        if (n == Account.FieldName.REGISTER_NEW_EMAIL) {
+          if (emailSender != null && emailSender.isEnabled()) {
+            fields.add(n);
+          }
+        } else {
+          fields.add(n);
+        }
+      }
+    }
+    return fields;
+  }
+
   @Override
   public boolean hasEmailAddress(IdentifiedUser user, String email) {
     for (AccountExternalId ext : user.state().getExternalIds()) {

gerrit-server/src/main/java/com/google/gerrit/server/account/Realm.java

@@ -24,6 +24,9 @@ public interface Realm {
   /** Can the end-user modify this field of their own account? */
   public boolean allowsEdit(Account.FieldName field);
 
+  /** Returns the account fields that the end-user can modify. */
+  public Set<Account.FieldName> getEditableFields();
+
   public AuthRequest authenticate(AuthRequest who) throws AccountException;
 
   public AuthRequest link(ReviewDb db, Account.Id to, AuthRequest who)

gerrit-server/src/main/java/com/google/gerrit/server/change/GetArchive.java

@@ -19,15 +19,13 @@ import com.google.common.collect.ImmutableMap;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.BinaryResult;
 import com.google.gerrit.extensions.restapi.RestReadView;
-import com.google.gerrit.server.config.ConfigUtil;
+import com.google.gerrit.server.config.DownloadConfig;
-import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 import org.eclipse.jgit.api.ArchiveCommand;
 import org.eclipse.jgit.api.errors.GitAPIException;
-import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
@@ -36,11 +34,7 @@ import org.kohsuke.args4j.Option;
 
 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
-import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;
 
@@ -51,28 +45,16 @@ public class GetArchive implements RestReadView<RevisionResource> {
     final Set<ArchiveFormat> allowed;
 
     @Inject
-    AllowedFormats(@GerritServerConfig Config cfg) {
+    AllowedFormats(DownloadConfig cfg) {
-      Collection<ArchiveFormat> enabled;
-      String v = cfg.getString("download", null, "archive");
-      if (v == null) {
-        enabled = Arrays.asList(ArchiveFormat.values());
-      } else if (v.isEmpty() || "off".equalsIgnoreCase(v)) {
-        enabled = Collections.emptyList();
-      } else {
-        enabled = ConfigUtil.getEnumList(cfg,
-            "download", null, "archive",
-            ArchiveFormat.TGZ);
-      }
-
       Map<String, ArchiveFormat> exts = new HashMap<>();
-      for (ArchiveFormat format : enabled) {
+      for (ArchiveFormat format : cfg.getArchiveFormats()) {
         for (String ext : format.getSuffixes()) {
           exts.put(ext, format);
         }
         exts.put(format.name().toLowerCase(), format);
       }
       extensions = ImmutableMap.copyOf(exts);
-      allowed = Collections.unmodifiableSet(new LinkedHashSet<>(enabled));
+      allowed = cfg.getArchiveFormats();
     }
 
     public Set<ArchiveFormat> getAllowed() {

gerrit-server/src/main/java/com/google/gerrit/server/config/AuthConfig.java

@@ -44,6 +44,7 @@ public class AuthConfig {
   private final boolean enableRunAs;
   private final boolean userNameToLowerCase;
   private final boolean gitBasicAuth;
+  private final boolean useContributorAgreements;
   private final String loginUrl;
   private final String logoutUrl;
   private final String openIdSsoUrl;
@@ -75,6 +76,8 @@ public class AuthConfig {
     trustContainerAuth = cfg.getBoolean("auth", "trustContainerAuth", false);
     enableRunAs = cfg.getBoolean("auth", null, "enableRunAs", true);
     gitBasicAuth = cfg.getBoolean("auth", "gitBasicAuth", false);
+    useContributorAgreements =
+        cfg.getBoolean("auth", "contributoragreements", false);
     userNameToLowerCase = cfg.getBoolean("auth", "userNameToLowerCase", false);
 
 
@@ -194,6 +197,11 @@ public class AuthConfig {
     return gitBasicAuth;
   }
 
+  /** Whether contributor agreements are used. */
+  public boolean isUseContributorAgreements() {
+    return useContributorAgreements;
+  }
+
   public boolean isIdentityTrustable(final Collection<AccountExternalId> ids) {
     switch (getAuthType()) {
       case DEVELOPMENT_BECOME_ANY_ACCOUNT:

gerrit-server/src/main/java/com/google/gerrit/server/config/DownloadConfig.java

@@ -16,12 +16,14 @@ package com.google.gerrit.server.config;
 
 import com.google.gerrit.reviewdb.client.AccountGeneralPreferences.DownloadCommand;
 import com.google.gerrit.reviewdb.client.AccountGeneralPreferences.DownloadScheme;
+import com.google.gerrit.server.change.ArchiveFormat;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 import org.eclipse.jgit.lib.Config;
 
 import java.util.Collections;
+import java.util.EnumSet;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -31,6 +33,7 @@ import java.util.Set;
 public class DownloadConfig {
   private final Set<DownloadScheme> downloadSchemes;
   private final Set<DownloadCommand> downloadCommands;
+  private final Set<ArchiveFormat> archiveFormats;
 
   @Inject
   DownloadConfig(@GerritServerConfig final Config cfg) {
@@ -45,6 +48,17 @@ public class DownloadConfig {
             DownloadCommand.DEFAULT_DOWNLOADS);
     downloadCommands =
         Collections.unmodifiableSet(new HashSet<>(allCommands));
+
+    String v = cfg.getString("download", null, "archive");
+    if (v == null) {
+      archiveFormats = EnumSet.allOf(ArchiveFormat.class);
+    } else if (v.isEmpty() || "off".equalsIgnoreCase(v)) {
+      archiveFormats = Collections.emptySet();
+    } else {
+      archiveFormats = new HashSet<>(ConfigUtil.getEnumList(cfg,
+          "download", null, "archive",
+          ArchiveFormat.TGZ));
+    }
   }
 
   /** Scheme used to download. */
@@ -56,4 +70,9 @@ public class DownloadConfig {
   public Set<DownloadCommand> getDownloadCommands() {
     return downloadCommands;
   }
+
+  /** Archive formats for downloading. */
+  public Set<ArchiveFormat> getArchiveFormats() {
+    return archiveFormats;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/config/GetServerInfo.java

@@ -0,0 +1,168 @@
+// Copyright (C) 2015 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.
+
+package com.google.gerrit.server.config;
+
+import com.google.gerrit.extensions.config.DownloadCommand;
+import com.google.gerrit.extensions.config.DownloadScheme;
+import com.google.gerrit.extensions.registration.DynamicMap;
+import com.google.gerrit.extensions.restapi.RestReadView;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.AuthType;
+import com.google.gerrit.server.account.Realm;
+import com.google.gerrit.server.change.ArchiveFormat;
+import com.google.inject.Inject;
+
+import org.eclipse.jgit.lib.Config;
+
+import java.net.MalformedURLException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class GetServerInfo implements RestReadView<ConfigResource> {
+  private final Config config;
+  private final AuthConfig authConfig;
+  private final Realm realm;
+  private final DownloadConfig downloadConfig;
+  private final DynamicMap<DownloadScheme> downloadSchemes;
+  private final DynamicMap<DownloadCommand> downloadCommands;
+  private final AllProjectsName allProjectsName;
+  private final AllUsersName allUsersName;
+
+  @Inject
+  public GetServerInfo(
+      @GerritServerConfig Config config,
+      AuthConfig authConfig,
+      Realm realm,
+      DownloadConfig downloadConfig,
+      DynamicMap<DownloadScheme> downloadSchemes,
+      DynamicMap<DownloadCommand> downloadCommands,
+      AllProjectsName allProjectsName,
+      AllUsersName allUsersName) {
+    this.config = config;
+    this.authConfig = authConfig;
+    this.realm = realm;
+    this.downloadConfig = downloadConfig;
+    this.downloadSchemes = downloadSchemes;
+    this.downloadCommands = downloadCommands;
+    this.allProjectsName = allProjectsName;
+    this.allUsersName = allUsersName;
+  }
+
+  @Override
+  public ServerInfo apply(ConfigResource rsrc) throws MalformedURLException {
+    ServerInfo info = new ServerInfo();
+    info.auth = new AuthInfo(authConfig, realm);
+    info.contactStore = getContactStoreInfo();
+    info.download =
+        new DownloadInfo(downloadConfig, downloadSchemes, downloadCommands);
+    info.gerrit = new GerritInfo(allProjectsName, allUsersName);
+    return info;
+  }
+
+  private ContactStoreInfo getContactStoreInfo() {
+    String url = config.getString("contactstore", null, "url");
+    if (url == null) {
+      return null;
+    }
+
+    ContactStoreInfo contactStore = new ContactStoreInfo();
+    contactStore.url = url;
+    return contactStore;
+  }
+
+  private static Boolean toBoolean(boolean v) {
+    return v ? v : null;
+  }
+
+  public static class ServerInfo {
+    public AuthInfo auth;
+    public ContactStoreInfo contactStore;
+    public DownloadInfo download;
+    public GerritInfo gerrit;
+  }
+
+  public static class AuthInfo {
+    public AuthType authType;
+    public Boolean useContributorAgreements;
+    public List<Account.FieldName> editableAccountFields;
+
+    public AuthInfo(AuthConfig cfg, Realm realm) {
+      authType = cfg.getAuthType();
+      useContributorAgreements = toBoolean(cfg.isUseContributorAgreements());
+      editableAccountFields = new ArrayList<>(realm.getEditableFields());
+    }
+  }
+
+  public static class ContactStoreInfo {
+    public String url;
+  }
+
+  public static class DownloadInfo {
+    public List<DownloadSchemeInfo> schemes;
+    public List<ArchiveFormat> archives;
+
+    public DownloadInfo(DownloadConfig downloadConfig,
+        DynamicMap<DownloadScheme> downloadSchemes,
+        DynamicMap<DownloadCommand> downloadCommands) {
+      schemes = new ArrayList<>();
+      for (DynamicMap.Entry<DownloadScheme> e : downloadSchemes) {
+        DownloadScheme scheme = e.getProvider().get();
+        if (scheme.isEnabled()) {
+          schemes.add(
+              new DownloadSchemeInfo(e.getExportName(), scheme, downloadCommands));
+        }
+      }
+      archives = new ArrayList<>(downloadConfig.getArchiveFormats());
+    }
+  }
+
+  public static class DownloadSchemeInfo {
+    public String name;
+    public String url;
+    public Boolean isAuthRequired;
+    public Boolean isAuthSupported;
+    public Map<String, String> commands;
+
+    public DownloadSchemeInfo(String schemeName, DownloadScheme scheme,
+        DynamicMap<DownloadCommand> downloadCommands) {
+      name = schemeName;
+      url = scheme.getUrl("${project}");
+      isAuthRequired = toBoolean(scheme.isAuthRequired());
+      isAuthSupported = toBoolean(scheme.isAuthSupported());
+
+      commands = new HashMap<>();
+      for (DynamicMap.Entry<DownloadCommand> e : downloadCommands) {
+        String commandName = e.getExportName();
+        DownloadCommand command = e.getProvider().get();
+        String c = command.getCommand(scheme, "${project}", "${ref}");
+        if (c != null) {
+          commands.put(commandName, c);
+        }
+      }
+    }
+  }
+
+  public static class GerritInfo {
+    public String allProjects;
+    public String allUsers;
+
+    public GerritInfo(AllProjectsName allProjectsName, AllUsersName allUsersName) {
+      allProjects = allProjectsName.get();
+      allUsers = allUsersName.get();
+    }
+  }
+}

gerrit-server/src/main/java/com/google/gerrit/server/config/Module.java

@@ -35,6 +35,7 @@ public class Module extends RestApiModule {
     delete(TASK_KIND).to(DeleteTask.class);
     child(CONFIG_KIND, "top-menus").to(TopMenuCollection.class);
     get(CONFIG_KIND, "version").to(GetVersion.class);
+    get(CONFIG_KIND, "info").to(GetServerInfo.class);
     get(CONFIG_KIND, "preferences").to(GetPreferences.class);
     put(CONFIG_KIND, "preferences").to(SetPreferences.class);
   }