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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.netbeans.libs.git;

/**
 * Used as a callback to acquire user's credentials and ask caller about 
 * different questions during an inter-repository commands, e.g. fetch, push, clone.
 * If an API client runs a git command that accesses a remote repository and the repository
 * requires authentication then this is the class it should use to pass the credentials.
 * 
 *  How to use this class
 * 
 * 
 * Get an instance of {@link GitClient} you want to run the fetch command with, see {@link GitRepository}
 * Extend this class and implement all abstract methods
 * Pass the instance of the class to the git client, see {@link GitClient#setCallback(org.netbeans.libs.git.GitClientCallback) }
 * Run a remote command, see e.g. {@link GitClient#fetch(java.lang.String, org.netbeans.libs.git.progress.ProgressMonitor) }
 * While the fetch command is running, methods getUsername and getPassword will be called from within the client
 * so make sure they return the correct credentials
 * 
 * Let's assume we want to run a fetch command on a remote repository at http://myrepositoryhost/path 
 * that requires credentials username/password:
 *  * GitClient client = {@link GitRepository#getInstance(java.io.File) GitRepository.getInstance(myLocalReposiry)}.{@link GitRepository#createClient() createClient()};
 * GitClientCallback myCallback = {@link GitClientCallback#GitClientCallback() new GitClientCallback ()} {
 *     public String askQuestion (String uri, String prompt) { return null; }
 *     
 *     public String getUsername (String uri, String prompt) {
 *         return "username";
 *     }
 *     
 *     public char[] getPassword (String uri, String prompt) {
 *         return "password".toCharArray();
 *     }
 *         
 *     public char[] getPassphrase (String uri, String prompt) { return null; }
 * 
 *     public String getIdentityFile (String uri, String prompt);
 *     public Boolean askYesNoQuestion (String uri, String prompt);
 * };
 * client.{@link GitClient#setCallback(org.netbeans.libs.git.GitClientCallback) setCallback(myCallback)};
 *{@code List} refspecs = Arrays.asList("refs/heads/*:refs/remotes/origin/*");
 * client.fetch("http://myrepositoryhost/path", refspecs, pm);}
 * 
 * 
 * Also note that returning null from the implemented methods means that you want to cancel the authentication attempt.
 * @author Ondra Vrabec
 */
public abstract class GitClientCallback {
    
    /**
     * Through this method you are asked a question you should answer.
     * You can implement this by raising a dialog asking a user a question and return his answer.
     * @param uri URI of a host you are trying to connect to.
     * @param prompt a question asked by the system that needs answering.
     * @return an answer to the given prompt or null if the authentication attempt should be halted.
     */
    public abstract String askQuestion (String uri, String prompt);
    
    /**
     * You should implement this to pass a username required by the authentication process.
     * @param uri URI of a host you are trying to connect to.
     * @param prompt explanation of what is expected as the return value
     * @return username or null if the authentication attempt should be halted.
     */
    public abstract String getUsername (String uri, String prompt);
    
    /**
     * Implement this to pass the user's password to the authentication process.
     * @param uri URI of a host you are trying to connect to.
     * @param prompt explanation of what is expected as the return value
     * @return password or null if the authentication attempt should be halted.
     */
    public abstract char[] getPassword (String uri, String prompt);
    
    /**
     * Implement this to pass the passphrase to unlock the private key.
     * @param uri URI of a host you are trying to connect to.
     * @param prompt explanation of what is expected as the return value
     * @return passphrase to unlock the private key or null if the authentication attempt should be halted.
     * @see #getIdentityFile(java.lang.String, java.lang.String) 
     */
    public abstract char[] getPassphrase (String uri, String prompt);
    
    /**
     * If the authentication should be done via a private/public key pair instead of usual username/password,
     * implement this method and return the absolute path to the file with the private key.
     * @param uri URI of a host you are trying to connect to.
     * @param prompt explanation of what is expected as the return value
     * @return absolute path to the identity file with the private key 
     *         or null if the authentication attempt should be halted.
     */
    public abstract String getIdentityFile (String uri, String prompt);
    
    /**
     * Through this method you are asked a question you should answer Yes or No.
     * You can implement this by raising a dialog asking a user a question and return his answer.
     * @param uri URI of a host you are trying to connect to.
     * @param prompt explanation of what is expected as the return value
     * @return reply to the answer or null if the authentication attempt should be halted.
     */
    public abstract Boolean askYesNoQuestion (String uri, String prompt);

}