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52 lines
2.0 KiB
JavaScript
52 lines
2.0 KiB
JavaScript
/* Copyright 2026 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const NON_ASCII_SPACES = new Set([
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0x00a0, 0x1680, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006,
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0x2007, 0x2008, 0x2009, 0x200a, 0x200b, 0x202f, 0x205f, 0x3000,
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]);
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const COMMONLY_MAPPED_TO_NOTHING = new Set([
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0x00ad, 0x034f, 0x1806, 0x180b, 0x180c, 0x180d, 0x200b, 0x200c, 0x200d,
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0x2060, 0xfe00, 0xfe01, 0xfe02, 0xfe03, 0xfe04, 0xfe05, 0xfe06, 0xfe07,
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0xfe08, 0xfe09, 0xfe0a, 0xfe0b, 0xfe0c, 0xfe0d, 0xfe0e, 0xfe0f, 0xfeff,
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]);
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function saslPrep(str) {
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let mapped = "";
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for (const char of str) {
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const code = char.codePointAt(0);
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if (NON_ASCII_SPACES.has(code)) {
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mapped += " ";
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} else if (!COMMONLY_MAPPED_TO_NOTHING.has(code)) {
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mapped += char;
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}
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}
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// SASLprep also specifies prohibited-output and bidirectional-text checks.
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// They are intentionally omitted here since this function is only used to
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// derive password candidates when opening PDFs. Being permissive lets us
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// handle non-conforming files whose producers omitted those checks too; the
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// derived candidate must still pass the PDF password verification.
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// TODO: SASLprep is based on Unicode 3.2, whereas String.prototype.normalize
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// uses the Unicode version provided by the JavaScript runtime. Use frozen
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// Unicode 3.2 normalization data if this difference causes interoperability
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// problems in practice.
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return mapped.normalize("NFKC");
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}
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export { saslPrep };
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