web-player: share form limits between client and server and extract form parsers

web-player/src/lib/server/forms/trackUploadForm.ts

@@ -0,0 +1,30 @@
+import { formFile, formString } from '$lib/server/api';
+import { LIMITS } from '$lib/validation';
+
+interface TrackUploadBody {
+	title: string;
+	audio: File;
+	cover: File;
+	tags: string[];
+	isExplicit: boolean;
+}
+
+export function parseTrackUploadForm(
+	form: FormData
+): { body: TrackUploadBody } | { failMessage: string } {
+	const title = formString(form, 'title').trim();
+	if (title === '' || title.length > LIMITS.trackTitle) {
+		return { failMessage: `El título es obligatorio (máx. ${LIMITS.trackTitle} caracteres).` };
+	}
+
+	const audio = formFile(form, 'audio');
+	if (!audio) return { failMessage: 'Selecciona un archivo de audio.' };
+
+	const cover = formFile(form, 'cover');
+	if (!cover) return { failMessage: 'Selecciona una portada.' };
+
+	const tags = [...new Set(form.getAll('tags').map(String))];
+	if (tags.length === 0) return { failMessage: 'Elige al menos un género.' };
+
+	return { body: { title, audio, cover, tags, isExplicit: form.get('isExplicit') === 'on' } };
+}