29 lines
559 B
JavaScript
29 lines
559 B
JavaScript
const MIN_USERNAME_LENGTH = 4;
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const MAX_USERNAME_LENGTH = 20;
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const MIN_PASSWORD_LENGTH = 8;
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const MAX_PASSWORD_LENGTH = 128;
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function isValidUsername(username) {
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if (typeof username !== "string") {
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return null;
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}
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if (
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username.length < MIN_USERNAME_LENGTH ||
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username.length > MAX_USERNAME_LENGTH
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) {
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return null;
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}
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const validChars = /^[a-zA-Z0-9_]+$/;
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return validChars.test(username);
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}
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module.exports = {
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isValidUsername,
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MAX_PASSWORD_LENGTH,
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MIN_PASSWORD_LENGTH,
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MAX_USERNAME_LENGTH,
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MIN_USERNAME_LENGTH,
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};
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