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daca7d65c2
Per mcilwain's suggestion in the LRP design doc, LRP tokens should use a Base58 alphabet. I'll move PasswordGenerator out of the tools package and into a utils class in a future CL, as we'll want to use this generator in the LrpToken class itself rather than relegate the token definition to a tool. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=132358363
55 lines
1.9 KiB
Java
55 lines
1.9 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.tools;
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import static com.google.common.base.Preconditions.checkArgument;
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import static com.google.common.collect.Lists.charactersOf;
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import com.google.common.collect.Iterators;
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import java.util.Iterator;
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import javax.inject.Named;
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/**
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* A string generator that produces strings using sequential characters in its alphabet. This is
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* most useful in tests as a "fake" password generator (which would otherwise use
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* {@link RandomStringGenerator}.
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*
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* <p>Note that consecutive calls to createString will continue where the last call left off in
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* the alphabet.
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*/
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class DeterministicStringGenerator extends StringGenerator {
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private Iterator<Character> iterator;
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/**
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* Generates a string using sequential characters in the generator's alphabet, cycling back to the
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* beginning of the alphabet if necessary.
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*/
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@Override
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public String createString(int length) {
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checkArgument(length > 0, "String length must be positive.");
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String password = "";
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for (int i = 0; i < length; i++) {
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password += iterator.next();
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}
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return password;
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}
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public DeterministicStringGenerator(@Named("alphabet") String alphabet) {
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super(alphabet);
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iterator = Iterators.cycle(charactersOf(alphabet));
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}
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}
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