knox

Node Amazon S3 Client.

Features

• Familiar API (client.get(), client.put(), etc)
• Uses node's crypto library (fast!, the others used native js)
• Very node-like low-level request api via http.Client
• Highly documented

Authors

• TJ Holowaychuk (visionmedia)
• Domenic Denicola (domenic)

Examples

The following examples demonstrate some capabilities of knox and the S3 REST API. First things first, create an S3 client:

var client = knox.createClient({
    key: '<api-key-here>'
  , secret: '<secret-here>'
  , bucket: 'learnboost'
});

By default knox will send all requests to the global endpoint (bucket.s3.amazonaws.com). This works regardless of the region where the bucket is. But if you want to manually set the endpoint (for performance reasons) you can do it with the endpoint option.

PUT

Below we do several things, first we read Readme.md into memory, and initialize a client request via client.put(), passing the destination filename as the first parameter (/test/Readme.md), and some headers. Then we listen for the response event, just as we would for any http.Client request, if we have a 200 response, great! output the destination url to stdout.

fs.readFile('Readme.md', function(err, buf){
  var req = client.put('/test/Readme.md', {
      'Content-Length': buf.length
    ,  'Content-Type': 'text/plain'
  });
  req.on('response', function(res){
    if (200 == res.statusCode) {
      console.log('saved to %s', req.url);
    }
  });
  req.end(buf);
});

By default the x-amz-acl header is public-read, meaning anyone can GET the file. To alter this simply pass this header to the client request method.

client.put('/test/Readme.md', { 'x-amz-acl': 'private' });

Each HTTP verb has an alternate method with the "File" suffix, for example put() also has a higher level method named putFile(), accepting a src filename and performs the dirty work shown above for you. Here is an example usage:

client.putFile('my.json', '/user.json', function(err, res){
  // Logic
});

Another alternative is to stream via Client#putStream(), for example:

var stream = fs.createReadStream('data.json');
client.putStream(stream, '/some-data.json', function(err, res){
  // Logic
});

(Note that this only works with file streams currently.)

An example of moving a file:

client.put('0/0/0.png', {
    'Content-Type': 'image/jpeg'
  , 'Content-Length': '0'
  , 'x-amz-copy-source': '/test-tiles/0/0/0.png'
  , 'x-amz-metadata-directive': 'REPLACE'
}).on('response', function(res) {
  // Logic
}).end();

GET

Below is an example GET request on the file we just shoved at S3. It simply outputs the response status code, headers, and body.

client.get('/test/Readme.md').on('response', function(res){
  console.log(res.statusCode);
  console.log(res.headers);
  res.setEncoding('utf8');
  res.on('data', function(chunk){
    console.log(chunk);
  });
}).end();

DELETE

Delete our file:

client.del('/test/Readme.md').on('response', function(res){
  console.log(res.statusCode);
  console.log(res.headers);
}).end();

Likewise we also have client.deleteFile() as a more concise (yet less flexible) solution:

client.deleteFile('/test/Readme.md', function(err, res){
  // Logic
});

Running Tests

To run the test suite you must first have an S3 account, and create a file named ./auth, which contains your credentials as json, for example:

{
  "key":"<api-key-here>",
  "secret":"<secret-here>",
  "bucket":"<your-bucket-name>"
}

Then install the dev dependencies and execute the test suite:

$ npm install
$ npm test

License

(The MIT License)

Copyright (c) 2010 LearnBoost <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.