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https://github.com/hgouveia/node-downloader-helper
A simple http file downloader for node.js
https://github.com/hgouveia/node-downloader-helper
downloader http nodejs
Last synced: about 2 months ago
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A simple http file downloader for node.js
- Host: GitHub
- URL: https://github.com/hgouveia/node-downloader-helper
- Owner: hgouveia
- License: mit
- Created: 2018-05-03T15:19:15.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2024-01-28T13:38:12.000Z (8 months ago)
- Last Synced: 2024-07-08T17:50:05.303Z (2 months ago)
- Topics: downloader, http, nodejs
- Language: JavaScript
- Size: 178 KB
- Stars: 247
- Watchers: 8
- Forks: 54
- Open Issues: 9
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE
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README
# node-downloader-helper
[](https://www.npmjs.com/package/node-downloader-helper)
[](https://ci.appveyor.com/project/hgouveia/node-downloader-helper) [](https://gitter.im/node-downloader-helper/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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A simple http file downloader for node.js
Features:
- No thirdparty dependecies
- Pause/Resume
- Retry on fail
- Supports http/https
- Supports http redirects
- Supports pipes
- Custom native http request options
- Usable on vanilla nodejs, electron, nwjs
- Progress stats
## Install
```
$ npm install --save node-downloader-helper
```
## Usage
For a more complete example check [example](example/) folder
```javascript
const { DownloaderHelper } = require('node-downloader-helper');
const dl = new DownloaderHelper('https://proof.ovh.net/files/1Gb.dat', __dirname);
dl.on('end', () => console.log('Download Completed'));
dl.on('error', (err) => console.log('Download Failed', err));
dl.start().catch(err => console.error(err));
```
**IMPORTANT NOTE:** I highly recommend to use both `.on('error')` and `.start().catch`, although they do the same thing, if `on('error')` is not defined, an error will be thrown when the `error` event is emitted and not listing, this is because EventEmitter is designed to throw an `unhandled error event` error if not been listened and is too late to change it now.
### CLI
This can be used as standalone CLI downloader
Install `npm i -g node-downloader-helper`
Usage: `ndh [folder] [url]`
```bash
$ ndh ./folder http://url
```
## Options
Download Helper constructor also allow a 3rd parameter to set some options `constructor(url, destinationFolder, options)`,
these are the default values
```javascript
{
body: null, // Request body, can be any, string, object, etc.
method: 'GET', // Request Method Verb
headers: {}, // Custom HTTP Header ex: Authorization, User-Agent
timeout: -1, // Request timeout in milliseconds (-1 use default), is the equivalent of 'httpRequestOptions: { timeout: value }' (also applied to https)
metadata: {}, // custom metadata for the user retrieve later (default:null)
resumeOnIncomplete: true, // Resume download if the file is incomplete (set false if using any pipe that modifies the file)
resumeOnIncompleteMaxRetry: 5, // Max retry when resumeOnIncomplete is true
resumeIfFileExists: false, // it will resume if a file already exists and is not completed, you might want to set removeOnStop and removeOnFail to false. If you used pipe for compression it will produce corrupted files
fileName: string|cb(fileName, filePath, contentType)|{name, ext}, // Custom filename when saved
retry: false, // { maxRetries: number, delay: number in ms } or false to disable (default)
forceResume: false, // If the server does not return the "accept-ranges" header, can be force if it does support it
removeOnStop: true, // remove the file when is stopped (default:true)
removeOnFail: true, // remove the file when fail (default:true)
progressThrottle: 1000, // interval time of the 'progress.throttled' event will be emitted
override: boolean|{skip, skipSmaller}, // Behavior when local file already exists
httpRequestOptions: {}, // Override the http request options
httpsRequestOptions: {}, // Override the https request options, ex: to add SSL Certs
}
```
for `body` you can provide any parameter accepted by http.request write function `req.write(body)` https://nodejs.org/api/http.html, when using this, you might need to add the `content-length` and `content-type` header in addition with the http method `POST` or `PUT`
ex:
```javascript
const data = JSON.stringify({
todo: 'Buy the milk'
});
const dl = new DownloaderHelper('my_url', __dirname, {
method: 'POST',
body: data,
headers: {
'Content-Type': 'application/json',
'Content-Length': data.length
} } );
```
for `fileName` you can provide 3 types of parameter
- **string**: will use the full string as the filename including extension
- **callback(fileName, filePath, contentType)**: must return an string, only sync function are supported ex: `(fileName) => 'PREFIX_' + fileName;`, **contentType** will be provided if available
- **object**: this object must contain a `name` attribute and an optional `ext` attribute, the `ext` attribute can be an string without dot(`.`) or a boolean where `true` use the `name` as full file name (same as just giving an string to the `fileName` parameter) or false *(default)* will only replace the name and keep the original extension, for example if the original name is `myfile.zip` and the option is `{name: 'somename'}` the output will be `somename.zip`
for `override` you can provide 2 types of parameter
- **boolean**: `true` to override existing local file, `false` to append '(number)' to new file name
- **object**: object with properties `skip` (boolean): whether to skip download if file exists, and `skipSmaller` (boolean): whether to skip download if file exists but is smaller. Both default to `false`, for the equivalent of `override: true`.
for `httpRequestOptions` the available options are detailed in here https://nodejs.org/api/http.html#http_http_request_options_callback
for `httpsRequestOptions` the available options are detailed in here https://nodejs.org/api/https.html#https_https_request_options_callback
## Methods
| Name | Description |
|---------- |--------------------------------------------------------------------------- |
| start | starts the downloading |
| pause | pause the downloading |
| resume | resume the downloading if supported, if not it will start from the beginning |
| stop | stop the downloading and remove the file |
| pipe | `readable.pipe(stream.Readable, options) : stream.Readable` |
| unpipe | `(stream)` if not stream is not specified, then all pipes are detached. |
| updateOptions | `(options, url)` updates the options, can be use on pause/resume events |
| getStats | returns `stats` from the current download, these are the same `stats` sent via progress event |
| getTotalSize | gets the total file size from the server |
| getDownloadPath | gets the full path where the file will be downloaded (available after the start phase) |
| isResumable | return true/false if the download can be resumable (available after the start phase) |
| getResumeState | Get the state required to resume the download after restart. This state can be passed back to `resumeFromFile()` to resume a download |
| resumeFromFile | `resumeFromFile(filePath?: string, state?: IResumeState)` Resume the download from a previous file path, if the state is not provided it will try to fetch from the information the headers and filePath, @see `resumeIfFileExists` option |
usage of `resumeFromFile`
```javascript
const downloadDir = 'D:/TEMP';
const { DownloaderHelper } = require('node-downloader-helper');
const dl = new DownloaderHelper('https://proof.ovh.net/files/1Gb.dat', downloadDir);
dl.on('end', () => console.log('Download Completed'));
dl.on('error', (err) => console.log('Download Failed', err));
// option 1
const prevFilePath = `${downloadDir}/1Gb.dat`;
dl.resumeFromFile(prevFilePath).catch(err => console.error(err));
// option 2
const prevState = dl.getResumeState(); // this should be stored in a file, localStorage, db, etc in a previous process for example on 'stop'
dl.resumeFromFile(prevState.filePath, prevState).catch(err => console.error(err));
```
## Events
| Name | Description |
|-------------- |----------------------------------------------------------------------------------- |
| start | Emitted when the .start method is called |
| skip | Emitted when the download is skipped because the file already exists |
| download | Emitted when the download starts `callback(downloadInfo)` |
| progress | Emitted every time gets data from the server `callback(stats)` |
| progress.throttled| The same as `progress` but emits every 1 second while is downloading `callback(stats)` |
| retry | Emitted when the download fails and retry is enabled `callback(attempt, retryOpts, err)` |
| end | Emitted when the downloading has finished `callback(downloadInfo)` |
| error | Emitted when there is any error `callback(error)` |
| timeout | Emitted when the underlying socket times out from inactivity. |
| pause | Emitted when the .pause method is called |
| stop | Emitted when the .stop method is called |
| resume | Emitted when the .resume method is called `callback(isResume)` |
| renamed | Emitted when '(number)' is appended to the end of file, this requires `override:false` opt, `callback(filePaths)` |
| redirected | Emitted when an url redirect happened `callback(newUrl, oldUrl)` NOTE: this will be triggered during getTotalSize() as well |
| stateChanged | Emitted when the state changes `callback(state)` |
| warning | Emitted when an error occurs that was not thrown intentionally `callback(err: Error)` |
event **skip** `skipInfo` object
```javascript
{
totalSize:, // total file size got from the server (will be set as 'null' if content-length header is not available)
fileName:, // original file name
filePath:, // original path name
downloadedSize:, // the downloaded amount
}
```
event **download** `downloadInfo` object
```javascript
{
totalSize:, // total file size got from the server (will be set as 'null' if content-length header is not available)
fileName:, // assigned name
filePath:, // download path
isResumed:, // if the download is a resume,
downloadedSize:, // the downloaded amount (only if is resumed otherwise always 0)
}
```
event **progress** or **progress.throttled** `stats` object
```javascript
{
name:, // file name
total:, // total size that needs to be downloaded in bytes, (will be set as 'null' if content-length header is not available)
downloaded:, // downloaded size in bytes
progress:, // progress porcentage 0-100%, (will be set as 0 if total is null)
speed: // download speed in bytes
}
```
event **end** `downloadInfo` object
```javascript
{
fileName:,
filePath:,
totalSize:, // total file size got from the server, (will be set as 'null' if content-length header is not available)
incomplete:, // true/false if the download endend but still incomplete, set as 'false' if totalSize is null
onDiskSize, // total size of file on the disk
downloadedSize:, // the total size downloaded
}
```
event **renamed** `filePaths` object
```javascript
{
path:, // modified path name
fileName:, // modified file name
prevPath:, // original path name
prevFileName:, // original file name
}
```
event **error** `error` object
```javascript
{
message:, // Error message
status:, // Http status response if available
body:, // Http body response if available
}
```
## States
| Name | Value |
|-------------- |---------------------------------- |
| IDLE | 'IDLE' |
| SKIPPED | 'SKIPPED' |
| STARTED | 'STARTED' |
| DOWNLOADING | 'DOWNLOADING' |
| PAUSED | 'PAUSED' |
| RESUMED | 'RESUMED' |
| STOPPED | 'STOPPED' |
| FINISHED | 'FINISHED' |
| FAILED | 'FAILED' |
| RETRY | 'RETRY' |
## Test
```
$ npm test
```
## License
Read [License](LICENSE) for more licensing information.
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## Contributing
Read [here](CONTRIBUTING.md) for more information.
## TODO
- Better code testing