wehub-resource-sync
34 lines
1.2 KiB
TypeScript
34 lines
1.2 KiB
TypeScript
// An inviter can only assign a role at or below their own. The systemRoles
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// array is in canonical order (highest authority first), so array index drives
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// the ladder. Custom roles aren't in the table and are refused. Dependency-free
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// so the rule can be unit-tested directly.
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export type LadderRole = { id: string };
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export function buildRoleLevel(roles: ReadonlyArray<LadderRole>): Record<string, number> {
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const level: Record<string, number> = {};
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roles.forEach((r, i) => {
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// Top of the array = highest level; larger number means more authority.
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level[r.id] = roles.length - i;
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});
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return level;
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}
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/**
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* Whether an inviter holding `inviterRoleId` may assign `invitedRoleId`.
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* A roleless inviter (`inviterRoleId == null`) and custom/unknown roles absent
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* from the ladder are all refused.
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*/
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export function isAtOrBelow(
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roles: ReadonlyArray<LadderRole>,
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inviterRoleId: string | null,
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invitedRoleId: string
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): boolean {
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if (!inviterRoleId) return false;
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const level = buildRoleLevel(roles);
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const inviter = level[inviterRoleId];
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const invited = level[invitedRoleId];
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if (inviter === undefined || invited === undefined) return false;
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return invited <= inviter;
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}
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