# go-nc-exapp

Shared Go Library for Nextcloud ExApp Services: AppAPI authentication, OCS calls, and per-user ExApp preferences. ExApps import `gitea.neitzel.de/konrad/go-nc-exapp`. File storage and folder visits live in go-nc-files.

## Language

**AppAPI credentials**:
The ExApp's shared secret and Nextcloud base URL, plus optional per-request user identity. Used to sign outbound calls to Nextcloud and to read the requesting user from inbound AppAPI-proxied requests.
_Avoid_: API key (generic), session token

**Requesting user**:
The Nextcloud user on whose behalf the current ExApp request runs, taken from AppAPI authorization headers. WebDAV and preferences use this user; there is no separate ExApp login.
_Avoid_: service account (for per-request identity), anonymous

**ExApp preference**:
A string value stored in Nextcloud for one user and one ExApp, keyed by the ExApp (not admin AppConfig). Libraries expose a parameterized key; each ExApp chooses its own key names.
_Avoid_: settings file in User Files, instance-wide config

**OCS**:
Nextcloud's legacy HTTP API surface under `/ocs/v2.php/…`. This Library requests JSON responses (`format=json`) for machine-readable bodies.
_Avoid_: assuming XML responses, REST-only Nextcloud APIs for ExApp prefs