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Add encryption support and access privileges
Based on foliojs/pdfkit#820 upstream Fixes #672
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Original file line number | Diff line number | Diff line change |
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import { | ||
isUnassignedCodePoint, | ||
isCommonlyMappedToNothing, | ||
isNonASCIISpaceCharacter, | ||
isProhibitedCharacter, | ||
isBidirectionalRAL, | ||
isBidirectionalL | ||
} from './lib/code-points'; | ||
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// 2.1. Mapping | ||
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/** | ||
* non-ASCII space characters [StringPrep, C.1.2] that can be | ||
* mapped to SPACE (U+0020) | ||
*/ | ||
const mapping2space = isNonASCIISpaceCharacter; | ||
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/** | ||
* the "commonly mapped to nothing" characters [StringPrep, B.1] | ||
* that can be mapped to nothing. | ||
*/ | ||
const mapping2nothing = isCommonlyMappedToNothing; | ||
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// utils | ||
const getCodePoint = character => character.codePointAt(0); | ||
const first = x => x[0]; | ||
const last = x => x[x.length - 1]; | ||
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/** | ||
* Convert provided string into an array of Unicode Code Points. | ||
* Based on https://stackoverflow.com/a/21409165/1556249 | ||
* and https://www.npmjs.com/package/code-point-at. | ||
* @param {string} input | ||
* @returns {number[]} | ||
*/ | ||
function toCodePoints(input) { | ||
const codepoints = []; | ||
const size = input.length; | ||
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for (let i = 0; i < size; i += 1) { | ||
const before = input.charCodeAt(i); | ||
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if (before >= 0xd800 && before <= 0xdbff && size > i + 1) { | ||
const next = input.charCodeAt(i + 1); | ||
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if (next >= 0xdc00 && next <= 0xdfff) { | ||
codepoints.push((before - 0xd800) * 0x400 + next - 0xdc00 + 0x10000); | ||
i += 1; | ||
continue; | ||
} | ||
} | ||
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codepoints.push(before); | ||
} | ||
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return codepoints; | ||
} | ||
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/** | ||
* SASLprep. | ||
* @param {string} input | ||
* @param {Object} opts | ||
* @param {boolean} opts.allowUnassigned | ||
* @returns {string} | ||
*/ | ||
function saslprep(input, opts = {}) { | ||
if (typeof input !== 'string') { | ||
throw new TypeError('Expected string.'); | ||
} | ||
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if (input.length === 0) { | ||
return ''; | ||
} | ||
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// 1. Map | ||
const mapped_input = toCodePoints(input) | ||
// 1.1 mapping to space | ||
.map(character => (mapping2space(character) ? 0x20 : character)) | ||
// 1.2 mapping to nothing | ||
.filter(character => !mapping2nothing(character)); | ||
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// 2. Normalize | ||
const normalized_input = String.fromCodePoint | ||
.apply(null, mapped_input) | ||
.normalize('NFKC'); | ||
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const normalized_map = toCodePoints(normalized_input); | ||
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// 3. Prohibit | ||
const hasProhibited = normalized_map.some(isProhibitedCharacter); | ||
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if (hasProhibited) { | ||
throw new Error( | ||
'Prohibited character, see https://tools.ietf.org/html/rfc4013#section-2.3' | ||
); | ||
} | ||
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// Unassigned Code Points | ||
if (opts.allowUnassigned !== true) { | ||
const hasUnassigned = normalized_map.some(isUnassignedCodePoint); | ||
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if (hasUnassigned) { | ||
throw new Error( | ||
'Unassigned code point, see https://tools.ietf.org/html/rfc4013#section-2.5' | ||
); | ||
} | ||
} | ||
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// 4. check bidi | ||
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const hasBidiRAL = normalized_map.some(isBidirectionalRAL); | ||
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const hasBidiL = normalized_map.some(isBidirectionalL); | ||
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// 4.1 If a string contains any RandALCat character, the string MUST NOT | ||
// contain any LCat character. | ||
if (hasBidiRAL && hasBidiL) { | ||
throw new Error( | ||
'String must not contain RandALCat and LCat at the same time,' + | ||
' see https://tools.ietf.org/html/rfc3454#section-6' | ||
); | ||
} | ||
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/** | ||
* 4.2 If a string contains any RandALCat character, a RandALCat | ||
* character MUST be the first character of the string, and a | ||
* RandALCat character MUST be the last character of the string. | ||
*/ | ||
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const isFirstBidiRAL = isBidirectionalRAL( | ||
getCodePoint(first(normalized_input)) | ||
); | ||
const isLastBidiRAL = isBidirectionalRAL( | ||
getCodePoint(last(normalized_input)) | ||
); | ||
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if (hasBidiRAL && !(isFirstBidiRAL && isLastBidiRAL)) { | ||
throw new Error( | ||
'Bidirectional RandALCat character must be the first and the last' + | ||
' character of the string, see https://tools.ietf.org/html/rfc3454#section-6' | ||
); | ||
} | ||
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return normalized_input; | ||
} | ||
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export default saslprep; |
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