init: Refactor init to be small parts created through Guice

I was nuts when I wrote init.  Making it all one giant program
in a single class was simply insane.  Instead we break it down
into many smaller classes and use Guice to manage the creation,
dependency injection, and control flow.

Since init knew about most of the Files under the $site_path we put
them all into a single immutable class called SitePaths and replace
all references to these throughout the code base to use SitePaths
and these well defined constants.

init can now also import GerritServer.properties into the newer
style gerrit.config and secure.config.  This ensure the database
settings are setup with the current defaults

Change-Id: I4f5d8256497c1a97df35754dbe6193c78edde9e1
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitAuth.java

@@ -0,0 +1,84 @@
+// Copyright (C) 2009 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.pgm.init;
+
+import static com.google.gerrit.pgm.init.InitUtil.dnOf;
+
+import com.google.gerrit.pgm.util.ConsoleUI;
+import com.google.gerrit.reviewdb.AuthType;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+/** Initialize the {@code auth} configuration section. */
+@Singleton
+class InitAuth implements InitStep {
+  private final ConsoleUI ui;
+  private final Section auth;
+  private final Section ldap;
+
+  @Inject
+  InitAuth(final ConsoleUI ui, final Section.Factory sections) {
+    this.ui = ui;
+    this.auth = sections.get("auth");
+    this.ldap = sections.get("ldap");
+  }
+
+  public void run() {
+    ui.header("User Authentication");
+
+    final AuthType auth_type =
+        auth.select("Authentication method", "type", AuthType.OPENID);
+
+    switch (auth_type) {
+      case HTTP:
+      case HTTP_LDAP: {
+        String hdr = auth.get("httpHeader");
+        if (ui.yesno(hdr != null, "Get username from custom HTTP header")) {
+          auth.string("Username HTTP header", "httpHeader", "SM_USER");
+        } else if (hdr != null) {
+          auth.unset("httpHeader");
+        }
+        auth.string("SSO logout URL", "logoutUrl", null);
+        break;
+      }
+    }
+
+    switch (auth_type) {
+      case LDAP:
+      case HTTP_LDAP: {
+        String server =
+            ldap.string("LDAP server", "server", "ldap://localhost");
+        if (server != null //
+            && !server.startsWith("ldap://") //
+            && !server.startsWith("ldaps://")) {
+          if (ui.yesno(false, "Use SSL")) {
+            server = "ldaps://" + server;
+          } else {
+            server = "ldap://" + server;
+          }
+          ldap.set("server", server);
+        }
+
+        ldap.string("LDAP username", "username", null);
+        ldap.password("username", "password");
+
+        final String def_dn = dnOf(server);
+        String aBase = ldap.string("Account BaseDN", "accountBase", def_dn);
+        String gBase = ldap.string("Group BaseDN", "groupBase", aBase);
+        break;
+      }
+    }
+  }
+}