neutralino-curl

A CURL Wrapper for Neutralino

This cross-platform CURL wrapper comes with the following features:

• Fast downloads and uploads via HTTP, HTTPS, FTP, FTPS.
• Supports custom HTTP-headers, e.g. for API authentication.
• No more headaches about CORS.
• Custom parameters support all possible CURL-protocols, like IMAP, POP3, SMTP, SMB, SCP, TELNET, WS, MQTT, LDAP and more.
• Emits JS events to for progress monitoring.

Run the demo

Clone this repo, and cd to the project folder. Copy the content from _install/YOUR_PLATFORM/bin/to resources/bin/.

Then enter

neu update --latest
neu run

Include in your own Project

neutralino-curl is not a classic WebSocket-bound extension. It only consists of the CURL binary for your platform and a JS lib.

Setup on all Platforms

• Copy the content from _install/YOUR_PLATFORM/bin/to extensions/curl/bin/.
• Include extensions/neutralino-curl/curl.jsin your index.hmlfile.
• Init CURL and add the required events to main.js.

Deployment

On Windows and Linux

The extensions folder needs to be placed beside your resources..neu folder:

app.exe
resources.neu
extensions

On macOS

The extensions folder goes into your app bundle's Resources folder. This can be automated with Neutralino Build Scripts.

CURL by Example

Init CURL

let CURL = new NeutralinoCurl();

Add Cutom-Headers

Set HTTP custom-headers. Use this once, it applies to all further operations:

CURL.addHttpHeader('X-API-Token', '1234');
CURL.addHttpHeader('X-API-User', 'jimbo');

GET- & POST-Requests

GET-Request:

let result = await CURL.get("https://domain.com/api-endpoint");

POST-Request:

let d = {
  field1: 1,
  field2: 2
}
await CURL.post("https://domain.com/api-endpoint", d);

Downloads & Uploads

Via HTTP or HTTPS

Download:

await CURL.download("https://file.zip");

Download as:

await CURL.download("https://file.zip", 'renamed_file.zip');

Upload :

await CURL.upload("file.zip, "https://server.com");

Via FTP or FTPS:

Set credentials. Use this once, it applies to all further operations:

CURL.setCredentials('username', 'password')

Download:

await CURL.download("ftp://server.com/file.zip");

Download as:

await CURL.download("ftp://server.com/file.zip", "renamed_file.zip");

Upload:

await CURL.upload("file.zip", "ftp://server.com/path")

Use any Protocol, any Command

You can use any command-line parameter and protocol, supported by the curl binary by using CURL.run(). If curl's output goes to stdout, the curlDataevent with curl's output in e.detail is triggered.

The following example lists all messages on a POP3-server:

await CURL.run('-k -l -u username:password pop3://mail.server.com');

Keep in mind, that special, shell-relevant characters in passwords need to be escaped:

// This will fail:
await CURL.run('-k -l -u user@server.com:My$Password! pop3://mail.server.com');
// This is the way:
await CURL.run('-k -l -u user@server.com:My\\$Password\\! pop3://mail.server.com');

Read more about the fantastic possibilites of curl here.

Methods

Method	Description
addHttpHeader(key, value)	Add a custom HTTP-header to the header-list. Headers are sent with each HTTP-upload or -download. key: HTTP-Header name value: HTTP-Header content
clearHttpHeader()	Clears the HTTP-header list.
get(url)	GET-Request. Returns data as string. url: API-endpoint
post(url, data)	POST-Request. url: API-endpoint data: POSt-data as stringified JSON.
download(src, dst)	Download a file via HTTP, HTTPS, FTP or FTPS. src: URL dst: File-path (optional)
upload(src, dst)	Upload a file via HTTP, HTTPS, FTP or FTPS. src: File-path dst: URL
resetProgress()	Resets the progress counter and emits a curlProgress event with data 0.0, which in turn clears a connected progressbar.
run(args)	Run the curl-binary with custom arguments. This method is also called from download() and upload() internally. args: Curl command-line parameters
setCredentials(usr, pwd)	Set credentials for FTP/FTPS operations. usr: Username pwd: Password

Events

Event	Description
curlStart	Emitted before the CURL binary is launched.
curlProgress(e)	Emitted with each download- or upload-progress step. e.detailcontains the current progress value as float.
curlData(e)	Using CURL.run()with custom args, all data is collected from curl's stdout and sent via e.detailfor further processing.
curlStop(e)	Emitted after the CURL binary stopped. e.detailcontains the exit code as an integer. Read about CURL exit codes here.

More about Neutralino

• NeutralinoJS Home
• Neutralino related blog posts at marketmix.com