A custom resource provider allows any file imported into Trilium (images, fonts, stylesheets) to be publicly accessible via a URL.

A potential use case for this is to add embed a custom font alongside a theme.

Steps for creating a custom resource provider

1. Import a file such as an image or a font into Trilium by drag & drop.
2. Select the file and go to the Owned Attributes section.
3. Add the label #customResourceProvider=hello.
4. To test if it is working, use a browser to navigate to <protocol>://<host>/custom/hello (where <protocol> is either http or https based on your setup, and <host> is the host or IP to your Trilium server instance). If you are running the TriliumNext application without a server, use http://localhost:37840 as the base URL.
5. If everything went well, at the previous step the browser should have downloaded the file uploaded in the first step.

Instead of hello, the name can be:

• A path, such as fonts/Roboto.ttf, which would be accessible via <host>/custom/fonts/Roboto.ttf.
• As a more advanced use case, a regular expression to match multiple routes, such as hello/.* which will be accessible via /custom/hello/1, /custom/hello/2, /custom/hello/world, etc.

Using it in a theme

For example, if you have a custom font to be imported by the theme, first upload a font file into Trilium and assign it the #customResourceProvider=fonts/myfont.ttf attribute.

Then modify the theme CSS to point to:

@font-face {
	font-family: customFont;
	src: url("/custom/fonts/myfont.ttf");
}

div {
	font-family: customFont;
}