Updated Custom request handler (markdown)

Custom request handler.md

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-Trilium provides a mechanism for [[scripts]] to open a public REST endpoint. This opens a way for various integrations with other services - a simple example would be creating new note from Slack by issuing a slash command (e.g. `/trilium buy milk`).
-
-## Create note from outside Trilium
-Let's take a look at an example. The goal is to provide a REST endpoint to which we can send title and content and Trilium will create a note.
-
-We'll start with creating a JavaScript backend [[code note|code notes]] containing:
-
-```javascript
-const {req, res} = api;
-const {secret, title, content} = req.body;
-
-if (req.method == 'POST' && secret === 'secret-password') {
-    // notes must be saved somewhere in the tree hierarchy specified by a parent note. 
-    // This is defined by a relation from this code note to the "target" parent note
-    // alternetively you can just use constant noteId for simplicity (get that from "Note Info" dialog of the desired parent note)
-    const targetParentNoteId = api.currentNote.getRelationValue('targetNote');
-    
-    const {note} = api.createTextNote(targetParentNoteId, title, content);
-    const notePojo = note.getPojo();
-
-    res.status(201).json(notePojo);
-}
-else {
-    res.send(400);
-}
-```
-
-This script note has also following two attributes:
-
-* label `#customRequestHandler` with value `create-note`
-* relation `~targetNote` pointing to a note where new notes should be saved
-
-### Explanation
-
-Let's test this by using an HTTP client to send a request:
-
-```http request
-POST http://my.trilium.org/custom/create-note
-Content-Type: application/json
-
-{
-  "secret": "secret-password",
-  "title": "hello",
-  "content": "world"
-}
-```
-
-Notice the `/custom` part in the request path - Trilium considers any request with this prefix as "custom" and tries to find a matching handler by looking at all notes which have `customRequestHandler` [[label|attributes]]. Value of this label then contains a regular expression which will match the request path (in our case trivial regex "create-note").
-
-Trilium will then find our code note created above and execute it. `api.req`, `api.res` are set to [request](https://expressjs.com/en/api.html#req) and [response](https://expressjs.com/en/api.html#res) objects from which we can get details of the request and also respond.
-
-In the code note we check the request method and then use trivial authentication - keep in mind that these endpoints are by default totally unauthenticated, and you need to take care of this yourself.
-
-Once we pass these checks we will just create the desired note using [[Script API]].
-
-## Custom resource provider
-
-Another common use case is that you want to just expose a file note - in such case you create label `customResourceProvider` (value is again path regex).
-
-Note: The file that is supposed to be exposed needs to have a label `#customResourceProvider="fonts/myFont.woff`
-
-For example, your file is in custom/fonts, you can call it via `custom/fonts/myFont.woff`.
-
-## Advanced concepts
-
-`api.req` and `api.res` are Express.js objects - you can always look into its [documentation](https://expressjs.com/en/api.html) for details.
-
-### Parameters
-
-REST request paths often contain parameters in the URL, e.g.:
-
-```
-http://my.trilium.org/custom/notes/123
-```
-
-The last part is dynamic so the matching of the URL must also be dynamic - for this reason the matching is done with regular expressions. Following `customRequestHandler` value would match it:
-
-```jsregexp
-notes/([0-9]+)
-```
-
-Additionally, this also defines a matching group with the use of parenthesis which then makes it easier to extract the value. The matched groups are available in `api.pathParams`:
-
-```javascript
-const noteId = api.pathParams[0];
-```
-
-Often you also need query params (as in e.g. `http://my.trilium.org/custom/notes?noteId=123`), you can get those with standard express `req.query.noteId`.

Custom-request-handler.md

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+See https://docs.triliumnotes.org/user-guide/advanced-usage/custom-request-handler.