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kanboard_ynh/sources/doc/plugin-external-link.markdown
2016-03-07 23:38:10 +01:00

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External Link Providers
=======================
This functionality allows you to link a task to additional items stored on another system.
For example, you can link a task to:
- Traditional web page
- Attachment (PDF documents stored on the web, archive...)
- Any ticketing system (bug tracker, customer support ticket...)
Each item has a type, a URL, a dependency type and a title.
By default, Kanboard includes two kinds of providers:
- Web Link: You copy and paste a link and Kanboard will fetch the page title automatically
- Attachment: Link to anything that is not a web page
Workflow
--------
1. The end-user copy and paste the URL to the form and submit
2. If the link type is "auto", Kanboard will loop through all providers registered until there is a match
3. Then, the link provider returns a object that implements the interface `ExternalLinkInterface`
4. A form is shown to the user with all pre-filled data before to save the link
Interfaces
----------
To implement a new link provider from a plugin, you need to create 2 classes that implement those interfaces:
- `Kanboard\Core\ExternalLink\ExternalLinkProviderInterface`
- `Kanboard\Core\ExternalLink\ExternalLinkInterface`
### ExternalLinkProviderInterface
| Method | Usage |
|----------------------------|-----------------------------------------------------------------|
| `getName()` | Get provider name (label) |
| `getType()` | Get link type (will be saved in the database) |
| `getDependencies()` | Get a dictionary of supported dependency types by the provider |
| `setUserTextInput($input)` | Set text entered by the user |
| `match()` | Return true if the provider can parse correctly the user input |
| `getLink()` | Get the link found with the properties |
### ExternalLinkInterface
| Method | Usage |
|-------------------|------------------|
| `getTitle()` | Get link title |
| `getUrl()` | Get link URL |
| `setUrl($url)` | Set link URL |
Register a new link provider
----------------------------
In your `Plugin.php`, just call the method `register()` from the object `ExternalLinkManager`:
```php
<?php
namespace Kanboard\Plugin\MyExternalLink;
use Kanboard\Core\Plugin\Base;
class Plugin extends Base
{
public function initialize()
{
$this->externalLinkManager->register(new MyLinkProvider());
}
}
```
Examples
--------
- Kanboard includes the default providers "WebLink" and "Attachment"