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index.js.map18.5 KB · 1 lines
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{ balanced } from 'balanced-match'\n\nconst escSlash = '\\0SLASH' + Math.random() + '\\0'\nconst escOpen = '\\0OPEN' + Math.random() + '\\0'\nconst escClose = '\\0CLOSE' + Math.random() + '\\0'\nconst escComma = '\\0COMMA' + Math.random() + '\\0'\nconst escPeriod = '\\0PERIOD' + Math.random() + '\\0'\nconst escSlashPattern = new RegExp(escSlash, 'g')\nconst escOpenPattern = new RegExp(escOpen, 'g')\nconst escClosePattern = new RegExp(escClose, 'g')\nconst escCommaPattern = new RegExp(escComma, 'g')\nconst escPeriodPattern = new RegExp(escPeriod, 'g')\nconst slashPattern = /\\\\\\\\/g\nconst openPattern = /\\\\{/g\nconst closePattern = /\\\\}/g\nconst commaPattern = /\\\\,/g\nconst periodPattern = /\\\\\\./g\n\nexport const EXPANSION_MAX = 100_000\n\n// `EXPANSION_MAX` caps the *number* of expansions, but not their length. An\n// input like `'{a,b}'.repeat(1500)` stays under that count - its output is\n// truncated to 100k results - while making every result ~1500 characters\n// long. The result set, and the intermediate arrays built while combining\n// brace sets, then grow large enough to exhaust memory and crash the process\n// (CVE-2026-14257). `EXPANSION_MAX_LENGTH` bounds the total number of\n// characters the accumulator may hold at any point, so memory stays flat no\n// matter how many brace groups are chained. The limit sits well above any\n// realistic expansion (100k results hitting `EXPANSION_MAX` measure ~1M\n// characters) so legitimate input is unaffected.\nexport const EXPANSION_MAX_LENGTH = 4_000_000\n\nfunction numeric(str: string) {\n  return !isNaN(str as any) ? parseInt(str, 10) : str.charCodeAt(0)\n}\n\nfunction escapeBraces(str: string) {\n  return str\n    .replace(slashPattern, escSlash)\n    .replace(openPattern, escOpen)\n    .replace(closePattern, escClose)\n    .replace(commaPattern, escComma)\n    .replace(periodPattern, escPeriod)\n}\n\nfunction unescapeBraces(str: string) {\n  return str\n    .replace(escSlashPattern, '\\\\')\n    .replace(escOpenPattern, '{')\n    .replace(escClosePattern, '}')\n    .replace(escCommaPattern, ',')\n    .replace(escPeriodPattern, '.')\n}\n\n/**\n * Basically just str.split(\",\"), but handling cases\n * where we have nested braced sections, which should be\n * treated as individual members, like {a,{b,c},d}\n */\nfunction parseCommaParts(str: string) {\n  if (!str) {\n    return ['']\n  }\n\n  const parts: string[] = []\n  const m = balanced('{', '}', str)\n\n  if (!m) {\n    return str.split(',')\n  }\n\n  const { pre, body, post } = m\n  const p = pre.split(',')\n\n  p[p.length - 1] += '{' + body + '}'\n  const postParts = parseCommaParts(post)\n  if (post.length) {\n    ;(p[p.length - 1] as string) += postParts.shift()\n    p.push.apply(p, postParts)\n  }\n\n  parts.push.apply(parts, p)\n\n  return parts\n}\n\nexport type BraceExpansionOptions = {\n  max?: number\n  maxLength?: number\n}\n\nexport function expand(str: string, options: BraceExpansionOptions = {}) {\n  if (!str) {\n    return []\n  }\n\n  const { max = EXPANSION_MAX, maxLength = EXPANSION_MAX_LENGTH } = options\n\n  // I don't know why Bash 4.3 does this, but it does.\n  // Anything starting with {} will have the first two bytes preserved\n  // but *only* at the top level, so {},a}b will not expand to anything,\n  // but a{},b}c will be expanded to [a}c,abc].\n  // One could argue that this is a bug in Bash, but since the goal of\n  // this module is to match Bash's rules, we escape a leading {}\n  if (str.slice(0, 2) === '{}') {\n    str = '\\\\{\\\\}' + str.slice(2)\n  }\n\n  return expand_(escapeBraces(str), max, maxLength, true).map(unescapeBraces)\n}\n\nfunction embrace(str: string) {\n  return '{' + str + '}'\n}\n\nfunction isPadded(el: string) {\n  return /^-?0\\d/.test(el)\n}\n\nfunction lte(i: number, y: number) {\n  return i <= y\n}\n\nfunction gte(i: number, y: number) {\n  return i >= y\n}\n\n// Build `{ acc[a] + pre + values[v] }` for every combination, capping the\n// number of results at `max` and the total number of characters at `maxLength`.\n// This is the one place output grows, so bounding it here keeps the single\n// accumulator - and therefore memory - flat regardless of how many brace groups\n// are combined (CVE-2026-14257).\nfunction combine(\n  acc: string[],\n  pre: string,\n  values: string[],\n  max: number,\n  maxLength: number,\n  dropEmpties: boolean,\n): string[] {\n  const out: string[] = []\n  let length = 0\n  for (let a = 0; a < acc.length; a++) {\n    for (let v = 0; v < values.length; v++) {\n      if (out.length >= max) return out\n      const expansion = (acc[a] as string) + pre + values[v]\n      // Bash drops empty results at the top level. Skip them before they count\n      // against `max`, so `max` bounds the number of *kept* results.\n      if (dropEmpties && !expansion) continue\n      if (length + expansion.length > maxLength) return out\n      out.push(expansion)\n      length += expansion.length\n    }\n  }\n  return out\n}\n\n// The expansion values of a single numeric (`1..5`) or alphabetic (`a..e..2`)\n// sequence body.\nfunction expandSequence(\n  body: string,\n  isAlphaSequence: boolean,\n  max: number,\n): string[] {\n  const n = body.split(/\\.\\./)\n  const N: string[] = []\n  // A sequence body always splits into two or three parts, but the compiler\n  // can't know that.\n  /* c8 ignore start */\n  if (n[0] === undefined || n[1] === undefined) {\n    return N\n  }\n  /* c8 ignore stop */\n  const x = numeric(n[0])\n  const y = numeric(n[1])\n  const width = Math.max(n[0].length, n[1].length)\n  let incr =\n    n.length === 3 && n[2] !== undefined ?\n      Math.max(Math.abs(numeric(n[2])), 1)\n    : 1\n  let test = lte\n  const reverse = y < x\n  if (reverse) {\n    incr *= -1\n    test = gte\n  }\n  const pad = n.some(isPadded)\n\n  for (let i = x; test(i, y) && N.length < max; i += incr) {\n    let c\n    if (isAlphaSequence) {\n      c = String.fromCharCode(i)\n      if (c === '\\\\') {\n        c = ''\n      }\n    } else {\n      c = String(i)\n      if (pad) {\n        const need = width - c.length\n        if (need > 0) {\n          const z = new Array(need + 1).join('0')\n          if (i < 0) {\n            c = '-' + z + c.slice(1)\n          } else {\n            c = z + c\n          }\n        }\n      }\n    }\n    N.push(c)\n  }\n  return N\n}\n\nfunction expand_(\n  str: string,\n  max: number,\n  maxLength: number,\n  isTop: boolean,\n): string[] {\n  // Consume the string's top-level brace groups left to right, threading a\n  // running set of combined prefixes (`acc`). Expanding the tail iteratively -\n  // rather than recursing on `m.post` once per group - keeps the native stack\n  // depth constant, so deeply chained input (`'{a,b}'.repeat(3000)`) can no\n  // longer overflow the stack, and leaves a single accumulator whose size\n  // `maxLength` bounds directly (CVE-2026-14257).\n  let acc: string[] = ['']\n\n  // Bash drops empty results, but only when the *first* top-level group is a\n  // comma set - a sequence like `{a..\\}` may legitimately yield ''. The drop\n  // is on the final strings, so it is applied to whichever `combine` produces\n  // them (the one with no brace set left in the tail).\n  let dropEmpties = false\n  let firstGroup = true\n\n  for (;;) {\n    const m = balanced('{', '}', str)\n\n    // No brace set left: the rest of the string is literal.\n    if (!m) {\n      return combine(acc, str, [''], max, maxLength, dropEmpties)\n    }\n\n    // no need to expand pre, since it is guaranteed to be free of brace-sets\n    const pre = m.pre\n\n    if (/\\$$/.test(pre)) {\n      acc = combine(\n        acc,\n        pre + '{' + m.body + '}',\n        [''],\n        max,\n        maxLength,\n        dropEmpties && !m.post.length,\n      )\n      firstGroup = false\n      if (!m.post.length) break\n      str = m.post\n      continue\n    }\n\n    const isNumericSequence = /^-?\\d+\\.\\.-?\\d+(?:\\.\\.-?\\d+)?$/.test(m.body)\n    const isAlphaSequence = /^[a-zA-Z]\\.\\.[a-zA-Z](?:\\.\\.-?\\d+)?$/.test(\n      m.body,\n    )\n    const isSequence = isNumericSequence || isAlphaSequence\n    const isOptions = m.body.indexOf(',') >= 0\n    if (!isSequence && !isOptions) {\n      // {a},b}\n      if (m.post.match(/,(?!,).*\\}/)) {\n        str = m.pre + '{' + m.body + escClose + m.post\n        isTop = true\n        continue\n      }\n      // Nothing here expands, so the whole remaining string is literal.\n      return combine(\n        acc,\n        pre + '{' + m.body + '}' + m.post,\n        [''],\n        max,\n        maxLength,\n        dropEmpties,\n      )\n    }\n\n    if (firstGroup) {\n      dropEmpties = isTop && !isSequence\n      firstGroup = false\n    }\n\n    let values: string[]\n    if (isSequence) {\n      values = expandSequence(m.body, isAlphaSequence, max)\n    } else {\n      let n = parseCommaParts(m.body)\n      if (n.length === 1 && n[0] !== undefined) {\n        // x{{a,b}}y ==> x{a}y x{b}y\n        n = expand_(n[0], max, maxLength, false).map(embrace)\n        //XXX is this necessary? Can't seem to hit it in tests.\n        /* c8 ignore start */\n        if (n.length === 1) {\n          acc = combine(\n            acc,\n            pre + n[0],\n            [''],\n            max,\n            maxLength,\n            dropEmpties && !m.post.length,\n          )\n          if (!m.post.length) break\n          str = m.post\n          continue\n        }\n        /* c8 ignore stop */\n      }\n\n      values = []\n      for (let j = 0; j < n.length; j++) {\n        values.push.apply(values, expand_(n[j] as string, max, maxLength, false))\n      }\n    }\n\n    acc = combine(acc, pre, values, max, maxLength, dropEmpties && !m.post.length)\n    if (!m.post.length) break\n    str = m.post\n  }\n\n  return acc\n}\n"]}