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chore: linear whitespace between adjacent encoded words is stripped

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killerprojecte
2026-06-19 23:12:20 +08:00
parent 5604b59501
commit c3a66683ee
1 changed files with 4 additions and 1 deletions
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apps/web/src/lib/utils.ts
+4 -1
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@@ -57,11 +57,14 @@ function normalizeCharset(charset: string): string {
* Decode RFC 2047 encoded words in mail headers (e.g. =?UTF-8?B?5byA5ZSu?=).
* Handles Base64 (B) and Quoted-Printable (Q) encoding.
* Supports non-UTF-8 charsets (e.g. GBK, GB2312, Shift_JIS) via charset alias normalization.
* Per RFC 2047 §6.2, linear whitespace between adjacent encoded words is stripped.
* Returns the original string unchanged if no encoded words are found or on error.
*/
export function decodeMimeHeader(value: string): string {
if (!value || !value.includes("=?")) return value
return value.replace(/=\?([^?]+)\?([bBqQ])\?([^?]*)\?=/g, (_match, charset, encoding, encoded) => {
// RFC 2047 §6.2: ignore whitespace between adjacent encoded words.
const collapsed = value.replace(/(\?=)\s+(=\?)/g, "$1$2")
return collapsed.replace(/=\?([^?]+)\?([bBqQ])\?([^?]*)\?=/g, (_match, charset, encoding, encoded) => {
try {
const lowerEncoding = String(encoding).toLowerCase()
let decoded: string