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The Azure Storage Java Blob library.
There is a newer version: 11.0.1
/*
 * Copyright Microsoft Corporation
 *
 * 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.microsoft.azure.storage.blob;


import java.util.Locale;

/**
 * This is a helper class to construct a string representing the permissions granted by a ServiceSAS to a container.
 * Setting a value to true means that any SAS which uses these permissions will grant permissions for that operation.
 * Once all the values are set, this should be serialized with toString and set as the permissions field on a
 * {@link ServiceSASSignatureValues} object. It is possible to construct the permissions string without this class, but
 * the order of the permissions is particular and this class guarantees correctness.
 */
public final class ContainerSASPermission {
    /**
     * Specifies Read access granted.
     */
    public boolean read;

    /**
     * Specifies Add access granted.
     */
    public boolean add;

    /**
     * Specifies Create access granted.
     */
    public boolean create;

    /**
     * Specifies Write access granted.
     */
    public boolean write;

    /**
     * Specifies Delete access granted.
     */
    public boolean delete;

    /**
     * Specifies List access granted.
     */
    public boolean list;

    /**
     * Initializes an {@code ContainerSASPermssion} object with all fields set to false.
     */
    public ContainerSASPermission() {}


    /**
     * Converts the given permissions to a {@code String}. Using this method will guarantee the permissions are in an
     * order accepted by the service.
     *
     * @return
     *      A {@code String} which represents the {@code ContainerSASPermission}.
     */
    @Override
    public String toString() {
        // The order of the characters should be as specified here to ensure correctness:
        // https://docs.microsoft.com/en-us/rest/api/storageservices/constructing-a-service-sas
        final StringBuilder builder = new StringBuilder();

        if (this.read) {
            builder.append('r');
        }

        if (this.add) {
            builder.append('a');
        }

        if (this.create) {
            builder.append('c');
        }

        if (this.write) {
            builder.append('w');
        }

        if (this.delete) {
            builder.append('d');
        }

        if (this.list) {
            builder.append('l');
        }

        return builder.toString();
    }

    /**
     * Creates an {@code ContainerSASPermission} from the specified permissions string. This method will throw an
     * {@code IllegalArgumentException} if it encounters a character that does not correspond to a valid permission.
     *
     * @param permString
     *      A {@code String} which represents the {@code ContainerSASPermission}.
     * @return
     *      A {@code ContainerSASPermission} generated from the given {@code String}.
     */
    public static ContainerSASPermission parse(String permString) {
        ContainerSASPermission permissions = new ContainerSASPermission();

        for (int i=0; i