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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 |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| import { | ||
| isUnassignedCodePoint, | ||
| isCommonlyMappedToNothing, | ||
| isNonASCIISpaceCharacter, | ||
| isProhibitedCharacter, | ||
| isBidirectionalRAL, | ||
| isBidirectionalL | ||
| } from './lib/code-points'; | ||
|
|
||
| // 2.1. Mapping | ||
|
|
||
| /** | ||
| * non-ASCII space characters [StringPrep, C.1.2] that can be | ||
| * mapped to SPACE (U+0020) | ||
| */ | ||
| const mapping2space = isNonASCIISpaceCharacter; | ||
|
|
||
| /** | ||
| * the "commonly mapped to nothing" characters [StringPrep, B.1] | ||
| * that can be mapped to nothing. | ||
| */ | ||
| const mapping2nothing = isCommonlyMappedToNothing; | ||
|
|
||
| // utils | ||
| const getCodePoint = character => character.codePointAt(0); | ||
| const first = x => x[0]; | ||
| const last = x => x[x.length - 1]; | ||
|
|
||
| /** | ||
| * 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.'); | ||
| } | ||
|
|
||
| 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)); | ||
|
|
||
| // 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' | ||
| ); | ||
| } | ||
|
|
||
| // Unassigned Code Points | ||
| if (opts.allowUnassigned !== true) { | ||
| const hasUnassigned = normalized_map.some(isUnassignedCodePoint); | ||
|
|
||
| if (hasUnassigned) { | ||
| throw new Error( | ||
| 'Unassigned code point, see https://tools.ietf.org/html/rfc4013#section-2.5' | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| // 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' | ||
| ); | ||
| } | ||
|
|
||
| /** | ||
| * 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' | ||
| ); | ||
| } | ||
|
|
||
| return normalized_input; | ||
| } | ||
|
|
||
| export default saslprep; |
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