# UPYUN Core

An UPYun Node.js SDK, using `request` and `async`.

Which Provides By Simple API Invoke:

* File Upload, Download
* Directory Create, Remove, Destroy(Recursively Remove)
* Entity Inspection, List Directory
* CDN Cache Purge

## Install

```
npm install upyun-core
```

## Usage

```
// require
var UPYUN = require('upyun-core');
var upyun = new UPYUN('bucket_name', 'user', 'pass');

// all the callbacks looks like
function(err[, data]){
  if (err) {
    // Do error handling
  } else {
    // Success
  }
}
```

## Methods

### writeFile(path, buffer, cb)
`// callback: function(err){}`

Write(Upload) `buffer` Content Up To The Given `path`.

According To The Official Documentation, The Directory Depth Levels Of `path` Should Not Large Than 10.

The `path` will be built automatically, like `mkdir -p path`.

```
upyun.writeFile(path, 'Node.js_Buffer_OR_String', cb);
```

### fetchFile(path, cb)
`// callback: function(err, contents){}`

Fetch(Download) `contents` From The Given `path`.

```
upyun.fetchFile(path, function(err, contents){
  if (err) {
    // Do error handling
  } else {
    // contents will be String or Buffer
  }
});
```

### removeFile(path, cb)
`// callback: function(err){}`

Remove(Delete) The Certain File From The Given `path`.

```
upyun.removeFile(path, cb);
```

### createDirs(path, cb)
`// callback: function(err){}`

Create The `path`.

According To The Official Documentation, The Directory Depth Levels Of `path` Should Not Large Than 10.

The `path` will be built automatically, like `mkdir -p path`.

```
upyun.createDirs(path, cb);
```

### removeDir(path, cb)
`// callback: function(err){}`

Remove(Delete) An **EMPTY** Directory By Given `path`.

```
upyun.removeDir(path, cb);
```

### destroyDir(path, callback)
`// callback: function(err){}`

Recursively Remove The Given Path(Directory).
Before Call This Method, Make Sure To Set "upyun.iDOReallyWantToDestroyDirectories" To true Every Time You Call This.

```
upyun.iDOReallyWantToDestroyDirectories = true;
upyun.destroyDir(path_you_really_want_to_destroy, cb);
```

### Introducing Data Structure Of An `entity`

```
var entity = {
  'path': '/storage/images/some_hash.jpg', // the full path of the file or directory
  'name': 'some_hash.jpg',                 // the base name with the file extension name
  'time': '1397211136',                    // the unix timestamp of file last modified
  'size': '438112',                        // the file size in bytes
  'type': 'file | folder'                  // UPYUN.TYPES.FILE | UPYUN.TYPES.FOLDER
};
```

### inspect(path, cb)
`// callback: function(err, entity){}`

Inspect The Entity Of The Given `path`.

```
upyun.inspect(path, cb);
```

### listDir(path, cb)
`// callback: function(err, an_array_of_entities){}`

List A Certain Directory By The Given `path`.

```
upyun.listDir(path, cb);
```

### bucketUsage(callback)
`// callback: function(err, bytesUsed){}`

Get The Total Bytes Used By This Bucket.

```
upyun.bucketUsage(cb);
```

### setHost(hostIndex)
`// no callback`

### purge(an_array_of_urls, cb)
`// callback: function(err, an_array_of_invalid_urls){}`

To Purge The CDN Cache Of Online Resources.

```
upyun.purge([url1, url2, url3], cb);
```

There are 4 hosts of UPYUN HTTP REST API, choose one of them.