38 lines
866 B
TypeScript
38 lines
866 B
TypeScript
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const WINDOW_MS = 20 * 60 * 1000; // 20 minutes
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const MAX_ATTEMPTS = 20;
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interface Entry
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{
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count: number;
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windowStart: number;
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}
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const store = new Map<string, Entry>();
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function delayMs( count: number ): number
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{
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if ( count <= 5 ) return 5_000;
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if ( count <= 10 ) return 15_000;
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return 30_000;
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}
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export function checkForgotPasswordRate( ip: string ): { blocked: boolean; delay: number }
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{
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const now = Date.now();
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let entry = store.get( ip );
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if ( !entry || now - entry.windowStart > WINDOW_MS )
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entry = { count: 0, windowStart: now };
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entry.count++;
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store.set( ip, entry );
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if ( entry.count > MAX_ATTEMPTS ) return { blocked: true, delay: 0 };
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return { blocked: false, delay: delayMs( entry.count ) };
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}
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export function sleep( ms: number ): Promise<void>
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{
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return new Promise( resolve => setTimeout( resolve, ms ) );
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}
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