Private key authentication

[davidkroell]

Goal: Add a mechanism for private key authentication instead of / in addition to a password.

Wanted functionality: When adding a connection, there should be any sort of input to add a SSH private key.

Below is a mockup of the view where the changes have to be made

This view has to be updated: activiy_connection_details.xml.
This view is used in the ConnectionDetailsActivity class.

You therefore have to add a new column in our SQLite Database to persist the private key. Either by saving it directly into the database as byte array or as file and attach a filepath to the model class and database. Furthermore, a field to decide if a private key should be used has to be added.

Connection model class seen below

docker2go/app/src/main/java/at/htl_villach/docker2go/Connection.java

Lines 9 to 16 in 5541f93

	public class Connection extends SugarRecord {
	private String hostname;
	private String username;
	private String password;
	private Integer sshPort;
	private Integer timesConnected = 0;
	private String operatingSystem = "";
	private String hostKey;

This has to be implemented into the underlying connection manager. We use the awesome library JSch for this.

docker2go/app/src/main/java/at/htl_villach/docker2go/AsyncTaskCommandExecutor.java

Lines 54 to 66 in 18c6d7e

	@Override
	protected void onPreExecute() {
	this.ces = new CommandExecutionSummary();
	// bootstrap connection to server
	try {
	JSch jsch = new JSch();
	this.jschSession = jsch.getSession(
	this.connection.getUsername(),
	this.connection.getHostname(),
	this.connection.getSshPort());
	this.jschSession.setPassword(this.connection.getPassword());

If any questions come to your mind feel free to ask.
Thanks in advance,

David