Centralize token generation and formats

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135313726

java/google/registry/tools/CreateAnchorTenantCommand.java

@@ -18,6 +18,8 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Strings.isNullOrEmpty;
 import static google.registry.model.registry.Registries.findTldForNameOrThrow;
 import static google.registry.pricing.PricingEngineProxy.getDomainCreateCost;
+import static google.registry.util.TokenUtils.TokenType.ANCHOR_TENANT;
+import static google.registry.util.TokenUtils.createToken;
 import static org.joda.time.DateTimeZone.UTC;
 
 import com.beust.jcommander.Parameter;
@@ -25,6 +27,7 @@ import com.beust.jcommander.Parameters;
 import com.google.common.net.InternetDomainName;
 import com.google.template.soy.data.SoyMapData;
 import google.registry.tools.soy.CreateAnchorTenantSoyInfo;
+import google.registry.util.StringGenerator;
 import javax.inject.Inject;
 import org.joda.money.Money;
 import org.joda.time.DateTime;
@@ -33,7 +36,6 @@ import org.joda.time.DateTime;
 @Parameters(separators = " =", commandDescription = "Provision a domain for an anchor tenant.")
 final class CreateAnchorTenantCommand extends MutatingEppToolCommand {
 
-  private static final int PASSWORD_LENGTH = 16;
   private static final int DEFAULT_ANCHOR_TENANT_PERIOD_YEARS = 2;
 
   @Parameter(
@@ -78,7 +80,7 @@ final class CreateAnchorTenantCommand extends MutatingEppToolCommand {
     checkArgument(superuser, "This command must be run as a superuser.");
     findTldForNameOrThrow(InternetDomainName.from(domainName)); // Check that the tld exists.
     if (isNullOrEmpty(password)) {
-      password = passwordGenerator.createString(PASSWORD_LENGTH);
+      password = createToken(ANCHOR_TENANT, passwordGenerator);
     }
 
     Money cost = null;

java/google/registry/tools/CreateContactCommand.java

@@ -22,6 +22,7 @@ import com.beust.jcommander.Parameters;
 import com.google.template.soy.data.SoyMapData;
 import google.registry.tools.params.PhoneNumberParameter;
 import google.registry.tools.soy.ContactCreateSoyInfo;
+import google.registry.util.StringGenerator;
 import java.util.List;
 import javax.inject.Inject;
 

java/google/registry/tools/CreateDomainCommand.java

@@ -21,6 +21,7 @@ import com.beust.jcommander.Parameter;
 import com.beust.jcommander.Parameters;
 import com.google.template.soy.data.SoyMapData;
 import google.registry.tools.soy.DomainCreateSoyInfo;
+import google.registry.util.StringGenerator;
 import java.util.List;
 import javax.inject.Inject;
 

java/google/registry/tools/CreateLrpTokensCommand.java

@@ -19,6 +19,7 @@ import static com.google.common.base.Strings.isNullOrEmpty;
 import static com.google.common.collect.Sets.difference;
 import static google.registry.model.ofy.ObjectifyService.ofy;
 import static google.registry.model.registry.Registries.assertTldExists;
+import static google.registry.util.TokenUtils.TokenType.LRP;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.beust.jcommander.Parameter;
@@ -34,6 +35,8 @@ import com.googlecode.objectify.Work;
 import google.registry.model.domain.LrpToken;
 import google.registry.tools.Command.RemoteApiCommand;
 import google.registry.tools.params.PathParameter;
+import google.registry.util.StringGenerator;
+import google.registry.util.TokenUtils;
 import java.io.StringReader;
 import java.nio.file.Path;
 import java.util.Collection;
@@ -70,7 +73,6 @@ public final class CreateLrpTokensCommand implements RemoteApiCommand {
 
   @Inject StringGenerator stringGenerator;
 
-  private static final int TOKEN_LENGTH = 16;
   private static final int BATCH_SIZE = 20;
 
   @Override
@@ -125,7 +127,7 @@ public final class CreateLrpTokensCommand implements RemoteApiCommand {
    */
   private ImmutableSet<String> generateTokens(int count) {
     final ImmutableSet<String> candidates =
-        ImmutableSet.copyOf(stringGenerator.createStrings(TOKEN_LENGTH, count));
+        ImmutableSet.copyOf(TokenUtils.createTokens(LRP, stringGenerator, count));
     ImmutableSet<Key<LrpToken>> existingTokenKeys = FluentIterable.from(candidates)
         .transform(new Function<String, Key<LrpToken>>() {
           @Override

java/google/registry/tools/RegistryToolComponent.java

@@ -51,6 +51,7 @@ interface RegistryToolComponent {
   void inject(CreateAnchorTenantCommand command);
   void inject(CreateContactCommand command);
   void inject(CreateDomainCommand command);
+  void inject(CreateLrpTokensCommand command);
   void inject(CreateTldCommand command);
   void inject(EncryptEscrowDepositCommand command);
   void inject(GenerateApplicationsReportCommand command);

java/google/registry/tools/RegistryToolModule.java

@@ -17,6 +17,8 @@ package google.registry.tools;
 import dagger.Binds;
 import dagger.Module;
 import dagger.Provides;
+import google.registry.util.RandomStringGenerator;
+import google.registry.util.StringGenerator;
 import java.security.NoSuchAlgorithmException;
 import java.security.ProviderException;
 import java.security.SecureRandom;

java/google/registry/tools/SetupOteCommand.java

@@ -28,6 +28,7 @@ import google.registry.model.registrar.Registrar;
 import google.registry.model.registry.Registry.TldState;
 import google.registry.tools.Command.RemoteApiCommand;
 import google.registry.tools.params.PathParameter;
+import google.registry.util.StringGenerator;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;

java/google/registry/util/RandomStringGenerator.java

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package google.registry.tools;
+package google.registry.util;
 
 import static com.google.common.base.Preconditions.checkArgument;
 
@@ -21,7 +21,7 @@ import javax.inject.Inject;
 import javax.inject.Named;
 
 /** Random string generator. */
-class RandomStringGenerator extends StringGenerator {
+public class RandomStringGenerator extends StringGenerator {
 
   private final Random random;
 

java/google/registry/util/StringGenerator.java

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package google.registry.tools;
+package google.registry.util;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Strings.isNullOrEmpty;
@@ -21,7 +21,7 @@ import com.google.common.collect.ImmutableList;
 import java.util.Collection;
 
 /** String generator. */
-abstract class StringGenerator {
+public abstract class StringGenerator {
 
   /** A class containing different alphabets used to generate strings. */
   public static class Alphabets {
@@ -37,13 +37,13 @@ abstract class StringGenerator {
 
   protected String alphabet;
 
-  StringGenerator(String alphabet) {
+  protected StringGenerator(String alphabet) {
     checkArgument(!isNullOrEmpty(alphabet), "Alphabet cannot be null or empty.");
     this.alphabet = alphabet;
   }
 
   /** Generates a string of a specified length. */
-  abstract String createString(int length);
+  public abstract String createString(int length);
 
   /** Batch-generates an {@link ImmutableList} of strings of a specified length. */
   public Collection<String> createStrings(int length, int count) {

java/google/registry/util/TokenUtils.java

@@ -0,0 +1,73 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// 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 google.registry.util;
+
+import com.google.common.base.Function;
+import com.google.common.collect.FluentIterable;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Iterables;
+
+/**
+ * A utility class for generating various auth tokens using a common prefixed-based format.
+ * These tokens are generally of the form [TYPE]_[randomstring].
+ */
+public final class TokenUtils {
+
+  /** An enum containing definitions (prefix and length) for token types. */
+  public enum TokenType {
+    ANCHOR_TENANT("ANCHOR", 16),
+    LRP("LRP", 16);
+
+    private final String prefix;
+    private final int length;
+
+    private TokenType(String prefix, int length) {
+      this.prefix = prefix;
+      this.length = length;
+    }
+
+    /** Returns the prefix for a given type. */
+    public String getPrefix() {
+      return prefix;
+    }
+
+    /** Returns the set token length for a given type (not including the prefix). */
+    public int getLength() {
+      return length;
+    }
+  }
+
+  /** Generates a single token of a given {@link TokenType}. */
+  public static String createToken(TokenType type, StringGenerator generator) {
+    return Iterables.getOnlyElement(createTokens(type, generator, 1));
+  }
+
+  /** Generates a {@link Collection} of tokens of a given {@link TokenType}. */
+  public static ImmutableSet<String> createTokens(
+      final TokenType type,
+      StringGenerator generator,
+      int count) {
+    return FluentIterable.from(generator.createStrings(type.getLength(), count))
+        .transform(new Function<String, String>() {
+          @Override
+          public String apply(String token) {
+            return String.format("%s_%s", type.getPrefix(), token);
+          }})
+        .toSet();
+  }
+
+  private TokenUtils() {}
+}
+