init: Move optional library download configuration to config file

Shifting our optional library downloads setup into a configuration
file gets the URLs and SHA1 strings out of the source code and
into a nice clean text format we can more easily update later on.
It really was bothering me that this data was hardcoded into our
source in random spots throughout init.

Change-Id: Ie9493c7607242f58a3045813eb4c0ffa4e9aba51
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-pgm/src/main/java/com/google/gerrit/pgm/Init.java

@@ -23,7 +23,7 @@ import com.google.gerrit.pgm.util.ConsoleUI;
 import com.google.gerrit.pgm.util.DataSourceProvider;
 import com.google.gerrit.pgm.util.ErrorLogFile;
 import com.google.gerrit.pgm.util.IoUtil;
-import com.google.gerrit.pgm.util.LibraryDownloader;
+import com.google.gerrit.pgm.util.Libraries;
 import com.google.gerrit.pgm.util.SiteProgram;
 import com.google.gerrit.reviewdb.AuthType;
 import com.google.gerrit.reviewdb.Project;
@@ -91,6 +91,7 @@ public class Init extends SiteProgram {
   private boolean isNew;
   private boolean deleteOnFailure;
   private ConsoleUI ui;
+  private Libraries libraries;
   private Injector dbInjector;
   private Injector sysInjector;
 
@@ -113,6 +114,7 @@ public class Init extends SiteProgram {
   public int run() throws Exception {
     ErrorLogFile.errorOnlyConsole();
     ui = ConsoleUI.getInstance(batchMode);
+    libraries = new Libraries(ui, getSitePath());
     initPathLocations();
 
     if (site_path.exists()) {
@@ -389,9 +391,7 @@ public class Init extends SiteProgram {
   private void downloadOptionalLibraries() {
     // Download and install BouncyCastle if the user wants to use it.
     //
-    createDownloader().setRequired(false).setName("Bouncy Castle Crypto v144")
-        .setJarUrl("http://www.bouncycastle.org/download/bcprov-jdk16-144.jar")
-        .setSHA1("6327a5f7a3dc45e0fd735adb5d08c5a74c05c20c").download();
+    libraries.bouncyCastle.downloadOptional();
     loadSiteLib();
   }
 
@@ -421,12 +421,7 @@ public class Init extends SiteProgram {
 
     switch (db_type) {
       case MYSQL:
-        createDownloader()
-            .setRequired(true)
-            .setName("MySQL Connector/J 5.1.10")
-            .setJarUrl(
-                "http://repo2.maven.org/maven2/mysql/mysql-connector-java/5.1.10/mysql-connector-java-5.1.10.jar")
-            .setSHA1("b83574124f1a00d6f70d56ba64aa52b8e1588e6d").download();
+        libraries.mysqlDriver.downloadRequired();
         loadSiteLib();
         break;
     }
@@ -999,10 +994,6 @@ public class Init extends SiteProgram {
     return dbInjector.createChildInjector(modules);
   }
 
-  private LibraryDownloader createDownloader() {
-    return new LibraryDownloader(ui, getSitePath());
-  }
-
   private static String version() {
     return com.google.gerrit.common.Version.getVersion();
   }

gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/Libraries.java

@@ -0,0 +1,107 @@
+// 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.util;
+
+import org.eclipse.jgit.errors.ConfigInvalidException;
+import org.eclipse.jgit.lib.Config;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+/** Standard {@link LibraryDownloader} instances derived from configuration. */
+public class Libraries {
+  private static final String RESOURCE_FILE =
+      "com/google/gerrit/pgm/libraries.config";
+
+  private final ConsoleUI ui;
+  private final File sitePath;
+
+  public LibraryDownloader bouncyCastle;
+  public LibraryDownloader mysqlDriver;
+
+  public Libraries(final ConsoleUI ui, final File sitePath) {
+    this.ui = ui;
+    this.sitePath = sitePath;
+    init();
+  }
+
+  private void init() {
+    final Config cfg = new Config();
+    try {
+      cfg.fromText(read(RESOURCE_FILE));
+    } catch (IOException e) {
+      throw new RuntimeException(e.getMessage(), e);
+    } catch (ConfigInvalidException e) {
+      throw new RuntimeException(e.getMessage(), e);
+    }
+
+    for (final Field f : Libraries.class.getDeclaredFields()) {
+      if ((f.getModifiers() & Modifier.STATIC) == 0
+          && f.getType() == LibraryDownloader.class) {
+        try {
+          init(f, cfg);
+        } catch (IllegalArgumentException e) {
+          throw new IllegalStateException("Cannot initialize " + f.getName());
+        } catch (IllegalAccessException e) {
+          throw new IllegalStateException("Cannot initialize " + f.getName());
+        }
+      }
+    }
+  }
+
+  private void init(final Field field, final Config cfg)
+      throws IllegalArgumentException, IllegalAccessException {
+    final String n = field.getName();
+    final LibraryDownloader dl = new LibraryDownloader(ui, sitePath);
+    dl.setName(get(cfg, n, "name"));
+    dl.setJarUrl(get(cfg, n, "url"));
+    dl.setSHA1(get(cfg, n, "sha1"));
+    field.set(this, dl);
+  }
+
+  private static String get(Config cfg, String name, String key) {
+    String val = cfg.getString("library", name, key);
+    if (val == null || val.isEmpty()) {
+      throw new IllegalStateException("Variable library." + name + "." + key
+          + " is required within " + RESOURCE_FILE);
+    }
+    return val;
+  }
+
+  private static String read(final String p) throws IOException {
+    InputStream in = Libraries.class.getClassLoader().getResourceAsStream(p);
+    if (in == null) {
+      throw new FileNotFoundException("Cannot load resource " + p);
+    }
+    final Reader r = new InputStreamReader(in, "UTF-8");
+    try {
+      final StringBuilder buf = new StringBuilder();
+      final char[] tmp = new char[512];
+      int n;
+      while (0 < (n = r.read(tmp))) {
+        buf.append(tmp, 0, n);
+      }
+      return buf.toString();
+    } finally {
+      r.close();
+    }
+  }
+}

gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/LibraryDownloader.java

@@ -46,27 +46,29 @@ public class LibraryDownloader {
     this.libDirectory = new File(sitePath, "lib");
   }
 
-  public LibraryDownloader setRequired(final boolean required) {
-    this.required = required;
-    return this;
-  }
-
-  public LibraryDownloader setName(final String name) {
+  public void setName(final String name) {
     this.name = name;
-    return this;
   }
 
-  public LibraryDownloader setJarUrl(final String url) {
+  public void setJarUrl(final String url) {
     this.jarUrl = url;
-    return this;
   }
 
-  public LibraryDownloader setSHA1(final String sha1) {
+  public void setSHA1(final String sha1) {
     this.sha1 = sha1;
-    return this;
   }
 
-  public void download() {
+  public void downloadRequired() {
+    this.required = true;
+    download();
+  }
+
+  public void downloadOptional() {
+    this.required = false;
+    download();
+  }
+
+  private void download() {
     if (jarUrl == null || !jarUrl.contains("/")) {
       throw new IllegalStateException("Invalid JarUrl for " + name);
     }

gerrit-pgm/src/main/resources/com/google/gerrit/pgm/libraries.config

@@ -0,0 +1,24 @@
+# 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.
+
+
+[library "bouncyCastle"]
+  name = Bouncy Castle Crypto v144
+  url = http://www.bouncycastle.org/download/bcprov-jdk16-144.jar
+  sha1 = 6327a5f7a3dc45e0fd735adb5d08c5a74c05c20c
+
+[library "mysqlDriver"]
+  name = MySQL Connector/J 5.1.10
+  url = http://repo2.maven.org/maven2/mysql/mysql-connector-java/5.1.10/mysql-connector-java-5.1.10.jar
+  sha1 = b83574124f1a00d6f70d56ba64aa52b8e1588e6d