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/**
 * 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;

import java.net.URI;
import java.net.URISyntaxException;
import java.security.InvalidKeyException;
import java.util.Map;

import com.microsoft.azure.storage.core.Base64;
import com.microsoft.azure.storage.core.SR;
import com.microsoft.azure.storage.core.Utility;

/**
 * Represents a set of credentials used to authenticate access to a Microsoft Azure storage account. This is the base
 * class for the {@link StorageCredentialsAccountAndKey} and {@link StorageCredentialsSharedAccessSignature} classes.
 */
public abstract class StorageCredentials {

    /**
     * Tries to determine the storage credentials from a collection of name/value pairs.
     * 
     * @param settings
     *            A Map object of the name/value pairs that represent the settings to use to configure
     *            the credentials.
     *            

* Either include an account name with an account key (specifying values for * {@link CloudStorageAccount#ACCOUNT_NAME_NAME} and {@link CloudStorageAccount#ACCOUNT_KEY_NAME} ), or a * shared access signature (specifying a value for * {@link CloudStorageAccount#SHARED_ACCESS_SIGNATURE_NAME} ). If you use an account name and account * key, do not include a shared access signature, and vice versa. * * @return A {@link StorageCredentials} object representing the storage credentials determined from the name/value * pairs. * * @throws InvalidKeyException * If the key value specified for {@link CloudStorageAccount#ACCOUNT_KEY_NAME} is not a valid * Base64-encoded string. */ protected static StorageCredentials tryParseCredentials(final Map settings) throws InvalidKeyException { final String accountName = settings.get(CloudStorageAccount.ACCOUNT_NAME_NAME) != null ? settings.get(CloudStorageAccount.ACCOUNT_NAME_NAME) : null; final String accountKey = settings.get(CloudStorageAccount.ACCOUNT_KEY_NAME) != null ? settings.get(CloudStorageAccount.ACCOUNT_KEY_NAME) : null; final String sasSignature = settings.get(CloudStorageAccount.SHARED_ACCESS_SIGNATURE_NAME) != null ? settings.get(CloudStorageAccount.SHARED_ACCESS_SIGNATURE_NAME) : null; if (accountName != null && accountKey != null && sasSignature == null) { if (Base64.validateIsBase64String(accountKey)) { return new StorageCredentialsAccountAndKey(accountName, accountKey); } else { throw new InvalidKeyException(SR.INVALID_KEY); } } if (accountName == null && accountKey == null && sasSignature != null) { return new StorageCredentialsSharedAccessSignature(sasSignature); } return null; } /** * Tries to determine the storage credentials from a connection string. *

* The format for the connection string is in the pattern "keyname=value". Multiple key/value pairs can be * separated by a semi-colon, for example, "keyname1=value1;keyname2=value2". Either include an account name * with an account key or a shared access signature. If you use an account name and account key, do not include a * shared access signature, and vice versa. *

* The same connection string can be used as for {@link CloudStorageAccount#parse(String)} but here only the account * name, account key, and sas key/value pairs will be examined. * * @param connectionString * A String that contains the key/value pairs that represent the storage credentials. * * @return A {@link StorageCredentials} object representing the storage credentials determined from the connection * string. * * @throws InvalidKeyException * If the account key specified in connectionString is not valid. * @throws StorageException */ public static StorageCredentials tryParseCredentials(final String connectionString) throws InvalidKeyException, StorageException { return tryParseCredentials(Utility.parseAccountString(connectionString)); } /** * A boolean representing whether this StorageCredentials object only allows access via HTTPS. */ private boolean httpsOnly = false; /** * Gets whether this StorageCredentials object only allows access via HTTPS. * * @return A boolean representing whether this StorageCredentials * object only allows access via HTTPS. */ public boolean isHttpsOnly() { return this.httpsOnly; } /** * Returns the associated account name for the credentials. This is null for anonymous and shared access signature * credentials. * * @return A String that represents the associated account name for the credentials */ public String getAccountName() { return null; } /** * Sets whether this StorageCredentials object only allows access via HTTPS. * @param httpsOnly * A boolean representing whether this StorageCredentials * object only allows access via HTTPS. */ protected void setHttpsOnly(boolean httpsOnly) { this.httpsOnly = httpsOnly; } /** * Returns a String that represents this instance. * * @param exportSecrets * true to include sensitive data in the return string; otherwise, false. * @return A String that represents this object, optionally including sensitive data. */ public abstract String toString(boolean exportSecrets); /** * Transforms a resource URI into a shared access signature URI, by appending a shared access token. * * @param resourceUri * A java.net.URI object that represents the resource URI to be transformed. * * @return A java.net.URI object that represents the signature, including the resource URI and the * shared access token. * * @throws StorageException * If a storage service error occurred. * @throws URISyntaxException * If the resource URI is not properly formatted. */ public URI transformUri(final URI resourceUri) throws URISyntaxException, StorageException { return this.transformUri(resourceUri, null); } /** * Transforms a resource URI into a shared access signature URI, by appending a shared access token. * * @param resourceUri * A StorageUri object that represents the resource URI to be transformed. * * @return A StorageUri object that represents the signature, including the resource URI and the * shared access token. * * @throws StorageException * If a storage service error occurred. * @throws URISyntaxException * If the resource URI is not properly formatted. */ public StorageUri transformUri(StorageUri resourceUri) throws URISyntaxException, StorageException { return this.transformUri(resourceUri, null /* opContext */); } /** * Transforms a resource URI into a shared access signature URI, by appending a shared access token and using the * specified operation context. * * @param resourceUri * A java.net.URI object that represents the resource URI to be transformed. * @param opContext * An {@link OperationContext} object that represents the context for the current operation. This object * is used to track requests to the storage service, and to provide additional runtime information about * the operation. * * @return A java.net.URI object that represents the signature, including the resource URI and the * shared access token. * * @throws StorageException * If a storage service error occurred. * @throws URISyntaxException * If the resource URI is not properly formatted. */ public abstract URI transformUri(URI resourceUri, OperationContext opContext) throws URISyntaxException, StorageException; /** * Transforms a resource URI into a shared access signature URI, by appending a shared access token and using the * specified operation context. * * @param resourceUri * A StorageUri object that represents the resource URI to be transformed. * @param opContext * An {@link OperationContext} object that represents the context for the current operation. This object * is used to track requests to the storage service, and to provide additional runtime information about * the operation. * * @return A StorageUri object that represents the signature, including the resource URI and the * shared access token. * * @throws StorageException * If a storage service error occurred. * @throws URISyntaxException * If the resource URI is not properly formatted. */ public abstract StorageUri transformUri(StorageUri resourceUri, OperationContext opContext) throws URISyntaxException, StorageException; }





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