custom_endpoint_2_directusv9.js

// Snippet for Directus' custom endpoint (tested on v9.8.0)
// This snippet checks if a role named "Homepage" is present and authenticates with it to execute custom logic
// In this case, it returns an image if the role has sufficient permissions. 
// It's pretty barebone, but should get you started. 

const { getPermissions } = require('directus/utils/get-permissions');
const { getSchema } = require('directus/utils/get-schema');

module.exports = function registerEndpoint(router, { services, exceptions, database }) {

    router.get('/images/:imageid', async (req, res, next) => {
        const { AssetsService } = services;
        const { ServiceUnavailableException } = exceptions;
        const imageid = req.params.imageid;

        // Searches for the role named "Homepage" and gets its UUID for the accountability authentication
        // This is made that way to ease portability since there can be different UUIDs on dev and prod server
        const role_res = await database("directus_roles").select("id").where({ name: "Homepage" });
        if (role_res.length === 0) {
            return next(new ServiceUnavailableException("Role doesn't exist"));
        }

        const accountability = {
            role: role_res[0].id,
            admin: false,
            app: false
        };

        const schema = await getSchema(accountability);
        accountability.permissions = await getPermissions(accountability, req.schema);

        const service = new AssetsService({ schema: schema, accountability: accountability });

        try{
            const { stream, file } = await service.getAsset(imageid, { /* Transformation Options */ })
            res.setHeader('Content-Type', file.type);
            res.setHeader('Accept-Ranges', 'bytes');
            
            stream.pipe(res);
        } catch(err) {
            return next(new ServiceUnavailableException(err.message));
        }
    });
};