mirror of
https://github.com/the-djmaze/snappymail.git
synced 2024-09-20 15:45:55 +08:00
36 lines
1.3 KiB
JavaScript
36 lines
1.3 KiB
JavaScript
const
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QPDecodeParams = [/=([0-9A-F]{2})/g, (...args) => String.fromCharCode(parseInt(args[1], 16))];
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export const
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// https://datatracker.ietf.org/doc/html/rfc2045#section-6.8
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BDecode = atob,
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// unescape(encodeURIComponent()) makes the UTF-16 DOMString to an UTF-8 string
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BEncode = data => btoa(unescape(encodeURIComponent(data))),
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/* // Without deprecated 'unescape':
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BEncode = data => btoa(encodeURIComponent(data).replace(
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/%([0-9A-F]{2})/g, (match, p1) => String.fromCharCode('0x' + p1)
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)),
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*/
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// https://datatracker.ietf.org/doc/html/rfc2045#section-6.7
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QPDecode = data => data.replace(/=\r?\n/g, '').replace(...QPDecodeParams),
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// https://datatracker.ietf.org/doc/html/rfc2047#section-4.1
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// https://datatracker.ietf.org/doc/html/rfc2047#section-4.2
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// encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
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decodeEncodedWords = data =>
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data.replace(/=\?([^?]+)\?(B|Q)\?(.+?)\?=/g, (m, charset, encoding, text) =>
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decodeText(charset, 'B' == encoding ? BDecode(text) : QPDecode(text))
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)
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,
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decodeText = (charset, data) => {
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try {
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// https://developer.mozilla.org/en-US/docs/Web/API/Encoding_API/Encodings
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return new TextDecoder(charset).decode(Uint8Array.from(data, c => c.charCodeAt(0)));
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} catch (e) {
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console.error({charset:charset,error:e});
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}
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};
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