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A client FTP library for NodeJS that focuses on correctness, clarity
and conciseness. It doesn't get in the way and plays nice with streaming APIs.

Starting it up
--------------

``javascript
var JSFtp = require("jsftp");

var Ftp = new JSFtp({
host: "myserver.com",
port: 3331, // defaults to 21
user: "user", // defaults to "anonymous"
pass: "1234" // defaults to "@anonymous"
});
`

jsftp gives you access to all the raw commands of the FTP protocol in form of
methods in the Ftp object. It also provides several convenience methods for
actions that require complex chains of commands (e.g. uploading and retrieving
files, passive operations), as shown below.

When raw commands succeed they always pass the response of the server to the
callback, in the form of an object that contains two properties: code, which
is the response code of the FTP operation, and text, which is the complete
text of the response.

Raw (or native) commands are accessible in the form Ftp.raw(command, params, callback)

Thus, a command like QUIT will be called like this:

`javascript
Ftp.raw("quit", function(err, data) {
if (err) return console.error(err);

console.log("Bye!");
});
`

and a command like MKD (make directory), which accepts parameters, looks like this:

`javascript
Ftp.raw("mkd", "/new_dir", function(err, data) {
if (err) return console.error(err);

console.log(data.text); // Show the FTP response text to the user
console.log(data.code); // Show the FTP response code to the user
});
`

API and examples
----------------

#### new Ftp(options)
- options is an object with the following properties:

`javascript
{
host: 'localhost', // Host name for the current FTP server.
port: 3333, // Port number for the current FTP server (defaults to 21).
user: 'user', // Username
pass: 'pass', // Password
}
`

Creates a new Ftp instance.


#### Ftp.host

Host name for the current FTP server.

#### Ftp.port

Port number for the current FTP server (defaults to 21).

#### Ftp.socket

NodeJS socket for the current FTP server.

#### Ftp.features

Array of feature names for the current FTP server. It is
generated when the user authenticates with the auth method.

#### Ftp.system

Contains the system identification string for the remote FTP server.

$3

#### Ftp.raw(command, [...args], callback)
With the raw method you can send any FTP command to the server. The method accepts a callback
with the signature err, data, in which err is the error response coming
from the server (usually a 4xx or 5xx error code) and the data is an object
that contains two properties: code and text. code is an integer indicating
the response code of the response and text is the response string itself.

#### Ftp.auth(username, password, callback)
Authenticates the user with the given username and password. If null or empty
values are passed for those, auth will use anonymous credentials. callback
will be called with the response text in case of successful login or with an
error as a first parameter, in normal Node fashion.

#### Ftp.ls(filePath, callback)
Lists information about files or directories and yields an array of file objects
with parsed file properties to the callback. You should use this function
instead of stat or list in case you need to do something with the individual
file properties.

`javascript
ftp.ls(".", function(err, res) {
res.forEach(function(file) {
console.log(file.name);
});
});
`

#### Ftp.list(filePath, callback)
Lists filePath contents using a passive connection. Calls callback with a
string containing the directory contents in long list format.

`javascript
ftp.list(remoteCWD, function(err, res) {
console.log(res);
// Prints something like
// -rw-r--r-- 1 sergi staff 4 Jun 03 09:32 testfile1.txt
// -rw-r--r-- 1 sergi staff 4 Jun 03 09:31 testfile2.txt
// -rw-r--r-- 1 sergi staff 0 May 29 13:05 testfile3.txt
// ...
});
`

#### Ftp.get(remotePath, callback)
Gives back a paused socket with the file contents ready to be streamed,
or calls the callback with an error if not successful.

`javascript
var str = ""; // Will store the contents of the file
ftp.get('remote/path/file.txt', function(err, socket) {
if (err) return;

socket.on("data", function(d) { str += d.toString(); })
socket.on("close", function(hadErr) {
if (hadErr)
console.error('There was an error retrieving the file.');
});
socket.resume();
});
`

#### Ftp.get(remotePath, localPath, callback)
Stores the remote file directly in the given local path.

`javascript
ftp.get('remote/file.txt', 'local/file.txt', function(hadErr) {
if (hadErr)
console.error('There was an error retrieving the file.');
else
console.log('File copied successfully!');
});
`

#### Ftp.put(source, remotePath, callback)
Uploads a file to filePath. It accepts a string with the local path for the
file or a Buffer as a source parameter.

`javascript
ftp.put(buffer, 'path/to/remote/file.txt', function(hadError) {
if (!hadError)
console.log("File transferred successfully!");
});
`

#### Ftp.rename(from, to, callback)
Renames a file in the server. from and to are both filepaths.

`javascript
ftp.rename(from, to, function(err, res) {
if (!err)
console.log("Renaming successful!");
});
`

#### Ftp.keepAlive([wait])
Refreshes the interval thats keep the server connection active. wait is an optional time period (in milliseconds) to wait between intervals.

You can find more usage examples in the unit tests. This documentation
will grow as jsftp evolves.


Debugging
---------

In order to enable debug mode in a FTP connection, a debugMode parameter can
be used in the constructors's config object:

`javascript
var Ftp = new JSFtp({
host: "myserver.com",
port: 3331,
user: "user",
pass: "1234",
debugMode: true
});
`

It can also be activated or deactivated by calling the setDebugMode method:

`javascript
Ftp.setDebugMode(true); // Debug Mode on
Ftp.setDebugMode(false); // Debug mode off
`

If the debug mode is on, the jsftp instance will emit jsftp_debug events with
two parameters: the first is the type of the event and the second and object
including data related to the event. There are 3 possible types of events:

- response events: These are response from the FTP server to the user's FTP
commands

- user_command events: These are commands that the user issues to the
FTP server.

- event:{event name} events: These are other events mostly related to the server
connection, such as timeout, connect or disconnect. For example,
a timeout event will have the name event:timeout.

In order to react to print all debug events (for example), we would listen to the
debug messages like this:

`javascript
Ftp.on('jsftp_debug', function(eventType, data) {
console.log('DEBUG: ', eventType);
console.log(JSON.stringify(data, null, 2));
});
``

Installation
------------

npm install jsftp

Test coverage
-------------

In order to run coverage reports:

npm install --dev
make coverage

Current overall coverage rate:
lines......: 95.5% (278 of 291 lines)
functions..: 100% (69 of 69 functions)

Tests
-----

To run tests:

npm install --dev
npm test

License
-------

See LICENSE.