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Copyright (C) 2015 Zalando SE ( 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 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 org.zalando.stups.tokens;
    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
    private final Supplier<FilefileSupplier;
    private static File getCredentialsDir() {
        final String dir = System.getenv("CREDENTIALS_DIR");
        if (dir == null) {
            throw new IllegalStateException("environment variable CREDENTIALS_DIR not set");
        return new File(dir);
    public AbstractJsonFileBackedCredentialsProvider(final String filename) {
        this. = () -> new File(getCredentialsDir(), filename);
    public AbstractJsonFileBackedCredentialsProvider(final File file) {
        this. = () -> file;
    protected File getFile() {
        return .get();
    protected  <T> T read(final Class<T> cls) {
        try {
            return .readValue(getFile(), cls);
        } catch (final Throwable e) {
            throw new CredentialsUnavailableException(e.getMessage(), e);
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