JDownloader2 plugin with a local HTTP API to add new files for download

This plugin is loaded by JDownloader2, which then starts up an embedded Jetty HTTP server to receive

From there, just about anything can send requests to queue up a new link. I like to use Tampermonkey userscripts to scrape links directly from web pages as I browse.

Note: it binds to your IP address, therefore other PCs on the network can add links. Configure a password or update the code to bind to something else - there is not currently a way configure local-only access. This plugin also accepts all Origins over ajax.

1. Close JDownloader.
2. Build or download the JDHttpApi.jar file.
3. Place that file in ./extensions/ inside the JDownloader2 program folder.
4. Open the file ./tmp/extensioncache/extensionInfos.json in your JD program folder and insert the following JSON as a new element in the array:

{
  "settings" : true,
  "configInterface" : "org.jdownloader.extensions.httpAPI.HttpAPIConfig",
  "quickToggle" : false,
  "headlessRunnable" : true,
  "description" : "Http API.",
  "lng" : "en_US",
  "iconPath" : "folder_add",
  "linuxRunnable" : true,
  "macRunnable" : true,
  "name" : "HTTP API",
  "version" : -1,
  "windowsRunnable" : true,
  "classname" : "org.jdownloader.extensions.httpAPI.HttpAPIExtension",
  "jarPath" : "/absolute/path/to/jd2/extensions/JDHttpApi.jar"
}

4. Open the file ./update/versioninfo/JD/extensions.installed.json inside the JD program folder and insert the string "jdhttpapi" as the last element in the JSON array.
5. Start JDownloader2 and go to the settings page to enable the extension.

Note: there is no official extension install process, so most of this is tricking JD into thinking the JAR is already installed. It's possible that an update will trigger a cache invalidation that boots out this extension. Just reapply the steps above and you should get it back.

This plugin has four settings to configure through the JDownloader GUI. In order to make changes take effect, disable and then re-enable the extension.

1. Use a password: require password authentication.
2. Port: the port that the HTTP server listens on. Defaults to 8297.
3. Password: If you've enabled the password feature, set it here.
4. Allow Get: This disables HTTP GET access to the API. When enabled, you must POST new links as JSON. This can help you reduce exposure to CSRF vulnerabilities, especially when combined with a password.

There is currently only one URL: /addLink. You may submit via POST or GET.

There are three parameters, only url is required:

• url: The URL to add.
• packageName: If you want to configure a custom package name, send it here.
• forcePackageName: Set this to true to set the package name. For whatever reason, this is a separate field in JD's internals but if you don't force it, the package name will not be changed. It's possible I am hooking in too late in the process.

The response has three possible values:

On success: {"success":true} On malformed input: {"errorMessage":"some error message"} On authentication failure: Login to access API (this is not JSON)

CURL Examples:

curl 'http://localhost:8297/addLink?url=https://i.imgur.com/muChjiN.jpg'
curl 'http://localhost:8297/addLink?url=https://i.imgur.com/muChjiN.jpg&packageName=cutebunny&forcePackageName=true'

Send a JSON object via POST with the same values as in the GET request:

curl -X POST 'http://localhost:8297/addLink' \
     -d '{"url":"https://i.imgur.com/muChjiN.jpg"}'
curl -X POST 'http://localhost:8297/addLink' \
     -d '{"url":"https://i.imgur.com/muChjiN.jpg","packageName":"cutebunny","forcePackageName":true}'

If you choose to use a password, send it as the password portion of HTTP Basic Authentication - leave the username blank.

CURL Example:

curl -u ':mypassword' 'http://192.168.1.7:8297/addLink?url=https://i.imgur.com/muChjiN.jpg'
curl -u ':mypassword' -X POST 'http://localhost:8297/addLink' \
     -d '{"url":"https://i.imgur.com/muChjiN.jpg"}'

JDownloader2's extension system is surprisingly modular and easy to understand (aside from the install process). Feel free to use this project as an example for building other JD extensions as even the built-in ones are a bit more complex than this. Just make sure to have the source code open up in another window for reference - there is virtually no documentation available and this project only uses the bare minimum of features.