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Stream content to/from an SFTP Server

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// repository documentation

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# Whoosh

Whoosh is an ultra thin wrapper for [SFTPStream](https://github.com/mscdex/ssh2-streams/blob/master/SFTPStream.md), with the additional benefit of being able to easily transfer in memory content to/from an SFTP server.

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## API

### connect(&lt;params&gt;, &lt;cb&gt;)

Connect to an sftp server

```js
Whoosh.connect(
  {
    hostname: 'sftp.example.com',
    port: 22,
    username: 'fred',
    password: 'secret',
  },
  (err, client) => {
    // profit :)
  }
);
```

See the [ssh2 client docs](https://github.com/mscdex/ssh2#client-methods) for a full list of connection parameters

### disconnect(&lt;cb&gt;)

Disconnect from an sftp server

```
Whoosh.connect(config, (err, client) => {
    client.disconnect(() => {
        // Disconnected
    })
})
```

### isConnected()

Returns true when connected to the SFTP server. Useful for checking whether a previously established connection has dropped.

```js
Whoosh.connect(config, (err, client) => {
  if (err) throw err;
  client.isConnected(); // returns true
});
```

### isConnected(&lt;cb&gt;)

Asynchronous version of isConnected

```js
Whoosh.connect(config, (err, client) => {
  if (err) throw err;
  client.isConnected((err, connected) => {
    // Check connected status here
  });
});
```

### getContent(&lt;path&gt;, [&lt;options&gt;], &lt;cb&gt;)

Downloads the contents of a remote file into a variable

```js
Whoosh.connect(config, (err, client) => {
  if (err) throw err;
  client.getContent('some/remote/file', (err, content, stats) => {
    client.disconnect(() => {
      if (err) throw err;
      console.log(`Downloaded ${stats.bytes} bytes in ${stats.duration} ms`);
    });
  });
});
```

The options parameter is is optional. When specified it is passed straight through to [SFTPStream's](https://github.com/mscdex/ssh2-streams/blob/master/SFTPStream.md) `createReadStream` method.

### putContent(&lt;content&gt;, &lt;path&gt;, [&lt;options&gt;], &lt;cb&gt;)

Uploads the contents of a variable to a remote file

```js
Whoosh.connect(config, (err, client) => {
  if (err) throw err;
  client.putContent('some conent', 'some/remote/file', (err, stats) => {
    client.disconnect(() => {
      if (err) throw err;
      console.log(`Uploaded ${stats.bytes} bytes in ${stats.duration} ms`);
    });
  });
});
```

The options parameter is is optional. When specified it is passed straight through to [SFTPStream's](https://github.com/mscdex/ssh2-streams/blob/master/SFTPStream.md) `createWriteStream` method.

### exists

Reports on whether a remote file exists

```js
Whoosh.connect(config, function (err, client) {
  if (err) throw err;
  client.exists('some/remote/file', (err, exists) => {
    client.disconnect(() => {
      if (err) throw err;
      console.log(exists ? 'File exists' : 'File does not exist');
    });
  });
});
```

## Everything else

The `client` object is just a decorated instance of [SFTPStream](https://github.com/mscdex/ssh2-streams/blob/master/SFTPStream.md) so all the other SFTP methods are available. e.g.

```js
Whoosh.connect(config, function (err, client) {
  if (err) throw err;
  client.unlink('some/remote/file', function (err) {
    client.disconnect(() => {
      if (err) throw err;
      console.log('Deleted some/remote/file');
    });
  });
});
```

### keyboard interactive

If the server requires keyboard interactive authentication you can configure this as follows...

```js
Whoosh.connect(
  {
    hostname: 'sftp.example.com',
    port: 22,
    tryKeyboard: true,
    challenges: [
      {
        pattern: /^Username:$/,
        response: 'fred',
      },
      {
        pattern: /^Password:$/,
        response: 'secret',
      },
    ],
  },
  (err, client) => {
    // profit :)
  }
);
```

The exact challenge patterns will be server dependent.

### Running tests

```
docker network create local
npm run docker
npm t
```

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