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better-auth

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The most comprehensive authentication library for TypeScript.

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const PROTO_POLLUTION_PATTERNS = { proto: /"(?:_|\\u0{2}5[Ff]){2}(?:p|\\u0{2}70)(?:r|\\u0{2}72)(?:o|\\u0{2}6[Ff])(?:t|\\u0{2}74)(?:o|\\u0{2}6[Ff])(?:_|\\u0{2}5[Ff]){2}"\s*:/, constructor: /"(?:c|\\u0063)(?:o|\\u006[Ff])(?:n|\\u006[Ee])(?:s|\\u0073)(?:t|\\u0074)(?:r|\\u0072)(?:u|\\u0075)(?:c|\\u0063)(?:t|\\u0074)(?:o|\\u006[Ff])(?:r|\\u0072)"\s*:/, protoShort: /"__proto__"\s*:/, constructorShort: /"constructor"\s*:/ }; const JSON_SIGNATURE = /^\s*["[{]|^\s*-?\d{1,16}(\.\d{1,17})?([Ee][+-]?\d+)?\s*$/; const SPECIAL_VALUES = { true: true, false: false, null: null, undefined: void 0, nan: Number.NaN, infinity: Number.POSITIVE_INFINITY, "-infinity": Number.NEGATIVE_INFINITY }; const ISO_DATE_REGEX = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d{1,7}))?(?:Z|([+-])(\d{2}):(\d{2}))$/; function isValidDate(date) { return date instanceof Date && !isNaN(date.getTime()); } function parseISODate(value) { const match = ISO_DATE_REGEX.exec(value); if (!match) return null; const [ , year, month, day, hour, minute, second, ms, offsetSign, offsetHour, offsetMinute ] = match; let date = new Date( Date.UTC( parseInt(year, 10), parseInt(month, 10) - 1, parseInt(day, 10), parseInt(hour, 10), parseInt(minute, 10), parseInt(second, 10), ms ? parseInt(ms.padEnd(3, "0"), 10) : 0 ) ); if (offsetSign) { const offset = (parseInt(offsetHour, 10) * 60 + parseInt(offsetMinute, 10)) * (offsetSign === "+" ? -1 : 1); date.setUTCMinutes(date.getUTCMinutes() + offset); } return isValidDate(date) ? date : null; } function betterJSONParse(value, options = {}) { const { strict = false, warnings = false, reviver, parseDates = true } = options; if (typeof value !== "string") { return value; } const trimmed = value.trim(); if (trimmed[0] === '"' && trimmed.endsWith('"') && !trimmed.slice(1, -1).includes('"')) { return trimmed.slice(1, -1); } const lowerValue = trimmed.toLowerCase(); if (lowerValue.length <= 9 && lowerValue in SPECIAL_VALUES) { return SPECIAL_VALUES[lowerValue]; } if (!JSON_SIGNATURE.test(trimmed)) { if (strict) { throw new SyntaxError("[better-json] Invalid JSON"); } return value; } const hasProtoPattern = Object.entries(PROTO_POLLUTION_PATTERNS).some( ([key, pattern]) => { const matches = pattern.test(trimmed); if (matches && warnings) { console.warn( `[better-json] Detected potential prototype pollution attempt using ${key} pattern` ); } return matches; } ); if (hasProtoPattern && strict) { throw new Error( "[better-json] Potential prototype pollution attempt detected" ); } try { const secureReviver = (key, value2) => { if (key === "__proto__" || key === "constructor" && value2 && typeof value2 === "object" && "prototype" in value2) { if (warnings) { console.warn( `[better-json] Dropping "${key}" key to prevent prototype pollution` ); } return void 0; } if (parseDates && typeof value2 === "string") { const date = parseISODate(value2); if (date) { return date; } } return reviver ? reviver(key, value2) : value2; }; return JSON.parse(trimmed, secureReviver); } catch (error) { if (strict) { throw error; } return value; } } function parseJSON(value, options = { strict: true }) { return betterJSONParse(value, options); } export { parseJSON as p };