31 lines
1.1 KiB
TypeScript
31 lines
1.1 KiB
TypeScript
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export function generateStealthId(length: number = 32): string {
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const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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const base = chars.length;
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const randomChars = (count: number): string =>
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Array.from({ length: count }, () => chars.charAt(Math.floor(Math.random() * base))).join('');
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// 生成前 length - 1 位
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const body = randomChars(length - 1);
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// 将 body 每个字符的 charCode 累加，再 mod base，作为校验位
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const sum = body.split('').reduce((acc, c) => acc + c.charCodeAt(0), 0);
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const checksum = chars.charAt(sum % base);
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return body + checksum;
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}
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export function isStealthId(id: string): boolean {
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const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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const base = chars.length;
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if (!/^[A-Za-z0-9]{32}$/.test(id)) return false;
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const body = id.slice(0, -1);
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const expectedChecksum = id.slice(-1);
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const sum = body.split('').reduce((acc, c) => acc + c.charCodeAt(0), 0);
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const checksum = chars.charAt(sum % base);
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return checksum === expectedChecksum;
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}
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