11 lines
542 B
TypeScript
11 lines
542 B
TypeScript
export function isValidSubscriptionId(id: unknown): id is string {
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return typeof id === 'string' && /^[A-Za-z0-9_-]{8,128}$/.test(id);
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}
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export function isValidFcmToken(value: unknown): value is string {
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// FCM registration tokens are opaque. In practice they're ~140–250 chars of
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// [A-Za-z0-9:_-]. Be permissive on length; strict on charset to block
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// obvious garbage without rejecting future token formats.
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return typeof value === 'string' && value.length >= 64 && value.length <= 4096 && /^[A-Za-z0-9:_\-]+$/.test(value);
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}
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