mirror of
https://github.com/dawidd6/action-send-mail.git
synced 2026-09-17 09:06:48 +07:00
674 lines
26 KiB
JavaScript
674 lines
26 KiB
JavaScript
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"use strict";
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/* eslint no-control-regex:0 */
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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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var desc = Object.getOwnPropertyDescriptor(m, k);
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if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
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desc = { enumerable: true, get: function() { return m[k]; } };
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}
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Object.defineProperty(o, k2, desc);
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}) : (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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o[k2] = m[k];
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}));
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var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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Object.defineProperty(o, "default", { enumerable: true, value: v });
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}) : function(o, v) {
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o["default"] = v;
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});
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var __importStar = (this && this.__importStar) || (function () {
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var ownKeys = function(o) {
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ownKeys = Object.getOwnPropertyNames || function (o) {
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var ar = [];
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for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
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return ar;
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};
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return ownKeys(o);
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};
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return function (mod) {
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if (mod && mod.__esModule) return mod;
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var result = {};
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if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
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__setModuleDefault(result, mod);
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return result;
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.isPlainText = isPlainText;
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exports.quoteString = quoteString;
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exports.hasLongerLines = hasLongerLines;
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exports.encodeWord = encodeWord;
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exports.encodeWords = encodeWords;
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exports.buildHeaderValue = buildHeaderValue;
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exports.buildHeaderParam = buildHeaderParam;
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exports.parseHeaderValue = parseHeaderValue;
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exports.detectExtension = detectExtension;
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exports.detectMimeType = detectMimeType;
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exports.foldLines = foldLines;
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exports.splitMimeEncodedString = splitMimeEncodedString;
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exports.encodeURICharComponent = encodeURICharComponent;
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exports.safeEncodeURIComponent = safeEncodeURIComponent;
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const base64 = __importStar(require("../base64/index.js"));
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const qp = __importStar(require("../qp/index.js"));
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const mimeTypes = __importStar(require("./mime-types.js"));
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const objects_js_1 = require("../shared/objects.js");
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/**
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* Checks if a value is plaintext string (uses only printable 7bit chars)
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*
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* When isParam is set the value is destined for a header parameter, so HT, CR and LF
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* are not plaintext either: a header parameter has no way to carry them. HT is a valid
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* fold point, so folding and unfolding a header would rewrite it as a space, and CR/LF
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* cannot appear in a header value at all. DEL is neither a token character nor qtext,
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* so it can not be carried bare or quoted. Such values have to go through the rfc2231
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* parameter continuation encoding instead, the same way a quote already does.
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*
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* @param value String to be tested
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* @param [isParam] Set to true if the value is a header parameter value
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* @returns true if it is a plaintext string
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*/
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function isPlainText(value, isParam) {
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const re = isParam ? /[\x00-\x1f\x7f"\u0080-\uFFFF]/ : /[\x00-\x08\x0b\x0c\x0e-\x1f\u0080-\uFFFF]/;
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return typeof value === 'string' && !re.test(value);
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}
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/**
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* Wraps a value into a quoted-string. Inside one a quote would end the string early
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* and a backslash would escape whatever follows it, so both go out as quoted-pairs.
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*
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* @param value String to be quoted
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* @returns The value as a quoted-string, quotes included
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*/
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function quoteString(value) {
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return '"' + (value || '').toString().replace(/["\\]/g, '\\$&') + '"';
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}
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/**
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* Checks if a multi line string containes lines longer than the selected value.
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*
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* Useful when detecting if a mail message needs any processing at all:
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* if only plaintext characters are used and lines are short, then there is
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* no need to encode the values in any way. If the value is plaintext but has
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* longer lines then allowed, then use format=flowed
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*
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* @param lineLength Max line length to check for
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* @returns Returns true if there is at least one line longer than lineLength chars
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*/
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function hasLongerLines(str, lineLength) {
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if (str.length > 128 * 1024) {
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// do not test strings longer than 128kB
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return true;
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}
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return new RegExp('^.{' + (lineLength + 1) + ',}', 'm').test(str);
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}
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/**
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* Encodes a string or an Buffer to an UTF-8 MIME Word (rfc2047)
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*
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* @param data String to be encoded
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* @param mimeWordEncoding='Q' Encoding for the mime word, either Q or B
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* @param [maxLength=0] If set, split mime words into several chunks if needed
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* @return Single or several mime words joined together
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*/
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function encodeWord(data, mimeWordEncoding, maxLength) {
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mimeWordEncoding = (mimeWordEncoding || 'Q').toString().toUpperCase().trim().charAt(0);
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maxLength = maxLength || 0;
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let encodedStr;
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const toCharset = 'UTF-8';
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if (maxLength && maxLength > 7 + toCharset.length) {
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maxLength -= 7 + toCharset.length;
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}
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if (mimeWordEncoding === 'Q') {
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// https://tools.ietf.org/html/rfc2047#section-5 rule (3)
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encodedStr = qp.encode(data).replace(/[^a-z0-9!*+\-/=]/gi, chr => {
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const ord = chr.charCodeAt(0).toString(16).toUpperCase();
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if (chr === ' ') {
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return '_';
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}
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return '=' + (ord.length === 1 ? '0' + ord : ord);
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});
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}
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else if (mimeWordEncoding === 'B') {
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// the chunking loop below splits raw text and base64 encodes each part, so a
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// Buffer goes in as its UTF-8 string: handing it the base64 of the whole input
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// would encode the encoding itself and decode back to base64 text
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encodedStr = typeof data === 'string' ? data : data.toString('utf-8');
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maxLength = maxLength ? Math.max(3, ((maxLength - (maxLength % 4)) / 4) * 3) : 0;
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}
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if (maxLength && (mimeWordEncoding !== 'B' ? encodedStr : base64.encode(data)).length > maxLength) {
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if (mimeWordEncoding === 'Q') {
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encodedStr = splitMimeEncodedString(encodedStr, maxLength).join('?= =?' + toCharset + '?' + mimeWordEncoding + '?');
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}
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else {
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// RFC2047 6.3 (2) states that encoded-word must include an integral number of characters, so no chopping unicode sequences
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const parts = [];
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let lpart = '';
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for (let i = 0, len = encodedStr.length; i < len; i++) {
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let chr = encodedStr.charAt(i);
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if (/[\ud800-\udbff]/.test(chr) && /[\udc00-\udfff]/.test(encodedStr.charAt(i + 1))) {
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// leading surrogate, so add the trailing surrogate as well
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// an unpaired one must not swallow the next unit, that would destroy
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// a valid pair following it
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chr += encodedStr.charAt(++i);
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}
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// check if we can add this character to the existing string
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// without breaking byte length limit
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if (Buffer.byteLength(lpart + chr) <= maxLength || i === 0) {
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lpart += chr;
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}
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else {
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// we hit the length limit, so push the existing string and start over
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parts.push(base64.encode(lpart));
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lpart = chr;
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}
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}
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if (lpart) {
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parts.push(base64.encode(lpart));
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}
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if (parts.length > 1) {
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encodedStr = parts.join('?= =?' + toCharset + '?' + mimeWordEncoding + '?');
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}
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else {
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encodedStr = parts.join('');
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}
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}
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}
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else if (mimeWordEncoding === 'B') {
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encodedStr = base64.encode(data);
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}
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return '=?' + toCharset + '?' + mimeWordEncoding + '?' + encodedStr + (encodedStr.substr(-2) === '?=' ? '' : '?=');
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}
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/**
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* Finds word sequences with non ascii text and converts these to mime words
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*
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* @param value String to be encoded
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* @param mimeWordEncoding='Q' Encoding for the mime word, either Q or B
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* @param [maxLength=0] If set, split mime words into several chunks if needed
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* @param [encodeAll=false] If true and the value needs encoding then encodes entire string, not just the smallest match
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* @return String with possible mime words
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*/
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function encodeWords(value, mimeWordEncoding, maxLength, encodeAll) {
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maxLength = maxLength || 0;
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// find first word with a non-printable ascii or special symbol in it
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const firstMatch = value.match(/(?:^|\s)([^\s]*["\u0080-\uFFFF])/);
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if (!firstMatch) {
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return value;
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}
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if (encodeAll) {
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// if it is requested to encode everything or the string contains something that resebles encoded word, then encode everything
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return encodeWord(value, mimeWordEncoding, maxLength);
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}
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// find the last word with a non-printable ascii in it
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const lastMatch = value.match(/(["\u0080-\uFFFF][^\s]*)[^"\u0080-\uFFFF]*$/);
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if (!lastMatch) {
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// should not happen
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return value;
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}
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const startIndex = firstMatch.index +
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(firstMatch[0].match(/[^\s]/) || {
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index: 0
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}).index;
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const endIndex = lastMatch.index + (lastMatch[1] || '').length;
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return ((startIndex ? value.substr(0, startIndex) : '') +
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encodeWord(value.substring(startIndex, endIndex), mimeWordEncoding || 'Q', maxLength) +
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(endIndex < value.length ? value.substr(endIndex) : ''));
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}
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/**
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* Joins parsed header value together as 'value; param1=value1; param2=value2'
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* PS: We are following RFC 822 for the list of special characters that we need to keep in quotes.
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* Refer: https://www.w3.org/Protocols/rfc1341/4_Content-Type.html
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* @param structured Parsed header value
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* @return joined header value
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*/
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function buildHeaderValue(structured) {
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const paramsArray = [];
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Object.keys(structured.params || {}).forEach(key => {
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// filename might include unicode characters so it is a special case
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// other values probably do not
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const value = structured.params[key];
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// a parameter name is a token too and it is emitted without any quoting around it
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const param = key.replace(/[\x00-\x1f\x7f]/g, '');
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if (!isPlainText(value, true) || value.length >= 75) {
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buildHeaderParam(param, value, 50).forEach(encodedParam => {
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if (!/[\s"\\;:/=(),<>@[\]?]|^[-']|'$/.test(encodedParam.value) || encodedParam.key.substr(-1) === '*') {
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paramsArray.push(encodedParam.key + '=' + encodedParam.value);
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}
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else {
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paramsArray.push(encodedParam.key + '=' + JSON.stringify(encodedParam.value));
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}
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});
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}
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else if (/[\s'"\\;:/=(),<>@[\]?]|^-/.test(value)) {
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paramsArray.push(param + '=' + JSON.stringify(value));
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}
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else {
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paramsArray.push(param + '=' + value);
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}
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});
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// the value ahead of the parameters is a token, it has no way to carry a control
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// char or DEL and there is no quoting construct around it to escape one into
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const value = typeof structured.value === 'string' ? structured.value.replace(/[\x00-\x1f\x7f]/g, '') : structured.value;
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return value + (paramsArray.length ? '; ' + paramsArray.join('; ') : '');
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}
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/**
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* Encodes a string or an Buffer to an UTF-8 Parameter Value Continuation encoding (rfc2231)
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* Useful for splitting long parameter values.
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*
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* For example
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* title="unicode string"
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* becomes
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* title*0*=utf-8''unicode
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* title*1*=%20string
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*
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* @param data String to be encoded
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* @param [maxLength=50] Max length for generated chunks
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* @param [fromCharset='UTF-8'] Source sharacter set
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* @return A list of encoded keys and headers
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*/
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function buildHeaderParam(key, data, maxLength) {
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const list = [];
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let encodedStr = typeof data === 'string' ? data : (data || '').toString();
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let chr;
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let line;
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let startPos = 0;
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let i, len;
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maxLength = maxLength || 50;
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// process ascii only text
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if (isPlainText(data, true)) {
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// check if conversion is even needed
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if (encodedStr.length <= maxLength) {
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return [
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{
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key,
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value: encodedStr
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}
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];
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}
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encodedStr = encodedStr.replace(new RegExp('.{' + maxLength + '}', 'g'), str => {
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list.push({
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line: str
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});
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return '';
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});
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if (encodedStr) {
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list.push({
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line: encodedStr
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});
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}
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}
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else {
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if (/[\uD800-\uDBFF]/.test(encodedStr)) {
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// string containts surrogate pairs, so normalize it to an array of bytes
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const encodedStrArr = [];
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for (i = 0, len = encodedStr.length; i < len; i++) {
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chr = encodedStr.charAt(i);
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if (/[\ud800-\udbff]/.test(chr) && /[\udc00-\udfff]/.test(encodedStr.charAt(i + 1))) {
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// an unpaired leading surrogate must not consume the next unit, that
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// would tear apart a valid pair following it
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chr += encodedStr.charAt(i + 1);
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encodedStrArr.push(chr);
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i++;
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}
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else {
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encodedStrArr.push(chr);
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}
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}
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encodedStr = encodedStrArr;
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}
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// first line includes the charset and language info and needs to be encoded
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// even if it does not contain any unicode characters
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line = "utf-8''";
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let encoded = true;
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startPos = 0;
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// process text with unicode or special chars
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for (i = 0, len = encodedStr.length; i < len; i++) {
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chr = encodedStr[i];
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if (encoded) {
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chr = safeEncodeURIComponent(chr);
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}
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else {
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// try to urlencode current char
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chr = chr === ' ' ? chr : safeEncodeURIComponent(chr);
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// By default it is not required to encode a line, the need
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// only appears when the string contains unicode or special chars
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|
|
// in this case we start processing the line over and encode all chars
|
||
|
|
if (chr !== encodedStr[i]) {
|
||
|
|
// Check if it is even possible to add the encoded char to the line
|
||
|
|
// If not, there is no reason to use this line, just push it to the list
|
||
|
|
// and start a new line with the char that needs encoding
|
||
|
|
if ((safeEncodeURIComponent(line) + chr).length >= maxLength) {
|
||
|
|
list.push({
|
||
|
|
line,
|
||
|
|
encoded
|
||
|
|
});
|
||
|
|
// the line we start here holds an encoded char, so it has to be
|
||
|
|
// flagged as one. otherwise it gets an unstarred continuation key
|
||
|
|
// and a receiver reads the percent escapes as literal text
|
||
|
|
line = '';
|
||
|
|
encoded = true;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
encoded = true;
|
||
|
|
i = startPos;
|
||
|
|
line = '';
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// if the line is already too long, push it to the list and start a new one
|
||
|
|
if ((line + chr).length >= maxLength) {
|
||
|
|
list.push({
|
||
|
|
line,
|
||
|
|
encoded
|
||
|
|
});
|
||
|
|
line = chr = encodedStr[i] === ' ' ? ' ' : safeEncodeURIComponent(encodedStr[i]);
|
||
|
|
if (chr === encodedStr[i]) {
|
||
|
|
encoded = false;
|
||
|
|
startPos = i - 1;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
encoded = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
line += chr;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (line) {
|
||
|
|
list.push({
|
||
|
|
line,
|
||
|
|
encoded
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return list.map((item, i) => ({
|
||
|
|
// encoded lines: {name}*{part}*
|
||
|
|
// unencoded lines: {name}*{part}
|
||
|
|
// if any line needs to be encoded then the first line (part==0) is always encoded
|
||
|
|
key: key + '*' + i + (item.encoded ? '*' : ''),
|
||
|
|
value: item.line
|
||
|
|
}));
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Parses a header value with key=value arguments into a structured
|
||
|
|
* object.
|
||
|
|
*
|
||
|
|
* parseHeaderValue('content-type: text/plain; CHARSET='UTF-8'') ->
|
||
|
|
* {
|
||
|
|
* 'value': 'text/plain',
|
||
|
|
* 'params': {
|
||
|
|
* 'charset': 'UTF-8'
|
||
|
|
* }
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* @param str Header value
|
||
|
|
* @return Header value as a parsed structure
|
||
|
|
*/
|
||
|
|
function parseHeaderValue(str) {
|
||
|
|
const response = {
|
||
|
|
value: false,
|
||
|
|
params: {}
|
||
|
|
};
|
||
|
|
// Parameter names come from a caller supplied contentType/contentDisposition. A
|
||
|
|
// "__proto__" name would target the prototype chain of the params object instead of
|
||
|
|
// an own property of it, and read back as Object.prototype, so it is dropped.
|
||
|
|
const setParam = (name, value) => {
|
||
|
|
if (!(0, objects_js_1.isProtoKey)(name)) {
|
||
|
|
response.params[name] = value;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
let key = false;
|
||
|
|
let value = '';
|
||
|
|
let type = 'value';
|
||
|
|
let quote = false;
|
||
|
|
let escaped = false;
|
||
|
|
let chr;
|
||
|
|
for (let i = 0, len = str.length; i < len; i++) {
|
||
|
|
chr = str.charAt(i);
|
||
|
|
if (type === 'key') {
|
||
|
|
if (chr === '=') {
|
||
|
|
key = value.trim().toLowerCase();
|
||
|
|
type = 'value';
|
||
|
|
value = '';
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
value += chr;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
if (escaped) {
|
||
|
|
value += chr;
|
||
|
|
}
|
||
|
|
else if (chr === '\\') {
|
||
|
|
escaped = true;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
else if (quote && chr === quote) {
|
||
|
|
quote = false;
|
||
|
|
}
|
||
|
|
else if (!quote && chr === '"') {
|
||
|
|
quote = chr;
|
||
|
|
}
|
||
|
|
else if (!quote && chr === ';') {
|
||
|
|
if (key === false) {
|
||
|
|
response.value = value.trim();
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
setParam(key, value.trim());
|
||
|
|
}
|
||
|
|
type = 'key';
|
||
|
|
value = '';
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
value += chr;
|
||
|
|
}
|
||
|
|
escaped = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (type === 'value') {
|
||
|
|
if (key === false) {
|
||
|
|
response.value = value.trim();
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
setParam(key, value.trim());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (value.trim()) {
|
||
|
|
setParam(value.trim().toLowerCase(), '');
|
||
|
|
}
|
||
|
|
// handle parameter value continuations
|
||
|
|
// https://tools.ietf.org/html/rfc2231#section-3
|
||
|
|
// preprocess values
|
||
|
|
Object.keys(response.params).forEach(key => {
|
||
|
|
let actualKey, nr, match, value;
|
||
|
|
if ((match = key.match(/(\*(\d+)|\*(\d+)\*|\*)$/))) {
|
||
|
|
actualKey = key.substr(0, match.index);
|
||
|
|
nr = Number(match[2] || match[3]) || 0;
|
||
|
|
if ((0, objects_js_1.isProtoKey)(actualKey)) {
|
||
|
|
// see setParam. Reading it back would yield Object.prototype, which is
|
||
|
|
// an object, so the initializer below would be skipped and the write
|
||
|
|
// that follows would throw out of a header build the caller can not catch
|
||
|
|
delete response.params[key];
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (!response.params[actualKey] || typeof response.params[actualKey] !== 'object') {
|
||
|
|
response.params[actualKey] = {
|
||
|
|
charset: false,
|
||
|
|
values: []
|
||
|
|
};
|
||
|
|
}
|
||
|
|
value = response.params[key];
|
||
|
|
if (nr === 0 && match[0].substr(-1) === '*' && (match = value.match(/^([^']*)'[^']*'(.*)$/))) {
|
||
|
|
response.params[actualKey].charset = match[1] || 'iso-8859-1';
|
||
|
|
value = match[2];
|
||
|
|
}
|
||
|
|
response.params[actualKey].values[nr] = value;
|
||
|
|
// remove the old reference
|
||
|
|
delete response.params[key];
|
||
|
|
}
|
||
|
|
});
|
||
|
|
// concatenate split rfc2231 strings and convert encoded strings to mime encoded words
|
||
|
|
Object.keys(response.params).forEach(key => {
|
||
|
|
let value;
|
||
|
|
if (response.params[key] && Array.isArray(response.params[key].values)) {
|
||
|
|
value = response.params[key].values.map((val) => val || '').join('');
|
||
|
|
if (response.params[key].charset) {
|
||
|
|
// convert "%AB" to "=?charset?Q?=AB?="
|
||
|
|
response.params[key] =
|
||
|
|
'=?' +
|
||
|
|
response.params[key].charset +
|
||
|
|
'?Q?' +
|
||
|
|
value
|
||
|
|
// fix invalidly encoded chars
|
||
|
|
.replace(/[=?_\s]/g, s => {
|
||
|
|
const c = s.charCodeAt(0).toString(16);
|
||
|
|
if (s === ' ') {
|
||
|
|
return '_';
|
||
|
|
}
|
||
|
|
return '%' + (c.length < 2 ? '0' : '') + c;
|
||
|
|
})
|
||
|
|
// change from urlencoding to percent encoding
|
||
|
|
.replace(/%/g, '=') +
|
||
|
|
'?=';
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
response.params[key] = value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
return response;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Returns file extension for a content type string. If no suitable extensions
|
||
|
|
* are found, 'bin' is used as the default extension
|
||
|
|
*
|
||
|
|
* @param mimeType Content type to be checked for
|
||
|
|
* @return File extension
|
||
|
|
*/
|
||
|
|
function detectExtension(mimeType) {
|
||
|
|
return mimeTypes.detectExtension(mimeType);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Returns content type for a file extension. If no suitable content types
|
||
|
|
* are found, 'application/octet-stream' is used as the default content type
|
||
|
|
*
|
||
|
|
* @param extension Extension to be checked for
|
||
|
|
* @return File extension
|
||
|
|
*/
|
||
|
|
function detectMimeType(extension) {
|
||
|
|
return mimeTypes.detectMimeType(extension);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Folds long lines, useful for folding header lines (afterSpace=false) and
|
||
|
|
* flowed text (afterSpace=true)
|
||
|
|
*
|
||
|
|
* @param str String to be folded
|
||
|
|
* @param [lineLength=76] Maximum length of a line
|
||
|
|
* @param afterSpace If true, leave a space in th end of a line
|
||
|
|
* @return String with folded lines
|
||
|
|
*/
|
||
|
|
function foldLines(str, lineLength, afterSpace) {
|
||
|
|
str = (str || '').toString();
|
||
|
|
lineLength = lineLength || 76;
|
||
|
|
let pos = 0;
|
||
|
|
const len = str.length;
|
||
|
|
let result = '';
|
||
|
|
let line, match;
|
||
|
|
while (pos < len) {
|
||
|
|
line = str.substr(pos, lineLength);
|
||
|
|
if (line.length < lineLength) {
|
||
|
|
result += line;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if ((match = line.match(/^[^\n\r]*(\r?\n|\r)/))) {
|
||
|
|
line = match[0];
|
||
|
|
result += line;
|
||
|
|
pos += line.length;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
else if ((match = line.match(/(\s+)[^\s]*$/)) && match[0].length - (afterSpace ? (match[1] || '').length : 0) < line.length) {
|
||
|
|
line = line.substr(0, line.length - (match[0].length - (afterSpace ? (match[1] || '').length : 0)));
|
||
|
|
}
|
||
|
|
else if ((match = str.substr(pos + line.length).match(/^[^\s]+(\s*)/))) {
|
||
|
|
line = line + match[0].substr(0, match[0].length - (!afterSpace ? (match[1] || '').length : 0));
|
||
|
|
}
|
||
|
|
result += line;
|
||
|
|
pos += line.length;
|
||
|
|
if (pos < len) {
|
||
|
|
result += '\r\n';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Splits a mime encoded string. Needed for dividing mime words into smaller chunks
|
||
|
|
*
|
||
|
|
* @param str Mime encoded string to be split up
|
||
|
|
* @param maxlen Maximum length of characters for one part (minimum 12)
|
||
|
|
* @return Split string
|
||
|
|
*/
|
||
|
|
function splitMimeEncodedString(str, maxlen) {
|
||
|
|
const lines = [];
|
||
|
|
let curLine, fallbackLine, match, chr, done;
|
||
|
|
// require at least 12 symbols to fit possible 4 octet UTF-8 sequences
|
||
|
|
maxlen = Math.max(maxlen || 0, 12);
|
||
|
|
while (str.length) {
|
||
|
|
curLine = str.substr(0, maxlen);
|
||
|
|
// move incomplete escaped char back to main
|
||
|
|
if ((match = curLine.match(/[=][0-9A-F]?$/i))) {
|
||
|
|
curLine = curLine.substr(0, match.index);
|
||
|
|
}
|
||
|
|
// Malformed input (a run of stray UTF-8 continuation bytes) has no split point
|
||
|
|
// that keeps a character sequence whole, so the loop below walks back to an
|
||
|
|
// empty line looking for one. Keep the widest chunk that at least does not cut
|
||
|
|
// a "=XX" escape in half, so the part stays a decodable encoded word.
|
||
|
|
fallbackLine = curLine.length ? curLine : str.substr(0, maxlen);
|
||
|
|
done = false;
|
||
|
|
while (!done && curLine.length) {
|
||
|
|
done = true;
|
||
|
|
// check if not middle of a unicode char sequence
|
||
|
|
if ((match = str.substr(curLine.length).match(/^[=]([0-9A-F]{2})/i))) {
|
||
|
|
chr = parseInt(match[1], 16);
|
||
|
|
// invalid sequence, move one char back anc recheck
|
||
|
|
if (chr < 0xc2 && chr > 0x7f) {
|
||
|
|
curLine = curLine.substr(0, curLine.length - 3);
|
||
|
|
done = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!curLine.length) {
|
||
|
|
curLine = fallbackLine;
|
||
|
|
}
|
||
|
|
lines.push(curLine);
|
||
|
|
str = str.substr(curLine.length);
|
||
|
|
}
|
||
|
|
return lines;
|
||
|
|
}
|
||
|
|
function encodeURICharComponent(chr) {
|
||
|
|
let res = '';
|
||
|
|
let ord = chr.charCodeAt(0).toString(16).toUpperCase();
|
||
|
|
if (ord.length % 2) {
|
||
|
|
ord = '0' + ord;
|
||
|
|
}
|
||
|
|
if (ord.length > 2) {
|
||
|
|
for (let i = 0, len = ord.length / 2; i < len; i++) {
|
||
|
|
res += '%' + ord.substr(i, 2);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
res += '%' + ord;
|
||
|
|
}
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
function safeEncodeURIComponent(str) {
|
||
|
|
str = (str || '').toString();
|
||
|
|
try {
|
||
|
|
// might throw if we try to encode invalid sequences, eg. partial emoji
|
||
|
|
str = encodeURIComponent(str);
|
||
|
|
}
|
||
|
|
catch (_E) {
|
||
|
|
// an unpaired surrogate has no utf-8 representation, so run the value through a
|
||
|
|
// utf-8 roundtrip to get the same U+FFFD every other encoder here produces and
|
||
|
|
// retry. the value must never come back unencoded, it goes into a header parameter
|
||
|
|
// where a bare quote or semicolon would break it out into a parameter of its own
|
||
|
|
str = encodeURIComponent(Buffer.from(str, 'utf-8').toString('utf-8'));
|
||
|
|
}
|
||
|
|
// ensure chars that are not handled by encodeURICompent are converted as well
|
||
|
|
return str.replace(/[\x00-\x1F *'()<>@,;:\\"[\]?=\u007F-\uFFFF]/g, chr => encodeURICharComponent(chr));
|
||
|
|
}
|