Martino Ferrari
44 lines
1.5 KiB
TypeScript
44 lines
1.5 KiB
TypeScript
import { createContext } from 'preact';
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import { useContext } from 'preact/hooks';
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import type { Me, AccessLevel } from './types';
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// Default identity used before /api/v1/me resolves (or if it fails): assume a
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// trusted LAN user with full access, matching the backend default.
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export const DEFAULT_ME: Me = { user: '', level: 'write', groups: [] };
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// AuthContext carries the resolved identity + global access level for the
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// current user throughout the app.
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export const AuthContext = createContext<Me>(DEFAULT_ME);
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export function useAuth(): Me {
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return useContext(AuthContext);
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}
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// canWrite reports whether the given level permits creating/modifying panels
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// and writing signal values.
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export function canWrite(level: AccessLevel): boolean {
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return level === 'write';
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}
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// canRead reports whether the given level permits viewing panels at all.
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export function canRead(level: AccessLevel): boolean {
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return level !== 'none';
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}
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// fetchMe loads the caller's identity from the backend. On failure it falls
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// back to the trusted-LAN default so the UI stays usable in dev/unproxied mode.
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export async function fetchMe(): Promise<Me> {
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try {
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const res = await fetch('/api/v1/me');
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if (!res.ok) return DEFAULT_ME;
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const data = await res.json();
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return {
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user: typeof data.user === 'string' ? data.user : '',
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level: (data.level as AccessLevel) ?? 'write',
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groups: Array.isArray(data.groups) ? data.groups : [],
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};
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} catch {
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return DEFAULT_ME;
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}
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}
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