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ESM: Ported HTML, Unicode, Quoted Printable and Endian operations
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244
src/core/operations/ToQuotedPrintable.mjs
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244
src/core/operations/ToQuotedPrintable.mjs
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/**
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* Some parts taken from mimelib (http://github.com/andris9/mimelib)
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* @author Andris Reinman
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* @license MIT
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*
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import Operation from "../Operation";
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/**
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* To Quoted Printable operation
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*/
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class ToQuotedPrintable extends Operation {
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/**
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* ToQuotedPrintable constructor
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*/
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constructor() {
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super();
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this.name = "To Quoted Printable";
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this.module = "Default";
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this.description = "Quoted-Printable, or QP encoding, is an encoding using printable ASCII characters (alphanumeric and the equals sign '=') to transmit 8-bit data over a 7-bit data path or, generally, over a medium which is not 8-bit clean. It is defined as a MIME content transfer encoding for use in e-mail.<br><br>QP works by using the equals sign '=' as an escape character. It also limits line length to 76, as some software has limits on line length.";
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this.inputType = "byteArray";
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this.outputType = "string";
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this.args = [];
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}
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/**
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* @param {byteArray} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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let mimeEncodedStr = this.mimeEncode(input);
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// fix line breaks
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mimeEncodedStr = mimeEncodedStr.replace(/\r?\n|\r/g, function() {
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return "\r\n";
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}).replace(/[\t ]+$/gm, function(spaces) {
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return spaces.replace(/ /g, "=20").replace(/\t/g, "=09");
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});
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return this._addSoftLinebreaks(mimeEncodedStr, "qp");
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}
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/** @license
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========================================================================
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mimelib: http://github.com/andris9/mimelib
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Copyright (c) 2011-2012 Andris Reinman
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/**
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* Encodes mime data.
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*
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* @param {byteArray} buffer
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* @returns {string}
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*/
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mimeEncode(buffer) {
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const ranges = [
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[0x09],
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[0x0A],
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[0x0D],
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[0x20],
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[0x21],
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[0x23, 0x3C],
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[0x3E],
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[0x40, 0x5E],
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[0x60, 0x7E]
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];
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let result = "";
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for (let i = 0, len = buffer.length; i < len; i++) {
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if (this._checkRanges(buffer[i], ranges)) {
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result += String.fromCharCode(buffer[i]);
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continue;
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}
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result += "=" + (buffer[i] < 0x10 ? "0" : "") + buffer[i].toString(16).toUpperCase();
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}
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return result;
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}
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/**
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* Checks if a given number falls within a given set of ranges.
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*
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* @private
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* @param {number} nr
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* @param {byteArray[]} ranges
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* @returns {bolean}
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*/
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_checkRanges(nr, ranges) {
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for (let i = ranges.length - 1; i >= 0; i--) {
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if (!ranges[i].length)
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continue;
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if (ranges[i].length === 1 && nr === ranges[i][0])
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return true;
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if (ranges[i].length === 2 && nr >= ranges[i][0] && nr <= ranges[i][1])
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return true;
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}
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return false;
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}
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/**
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* Adds soft line breaks to a string.
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* Lines can't be longer that 76 + <CR><LF> = 78 bytes
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* http://tools.ietf.org/html/rfc2045#section-6.7
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*
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* @private
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* @param {string} str
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* @param {string} encoding
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* @returns {string}
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*/
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_addSoftLinebreaks(str, encoding) {
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const lineLengthMax = 76;
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encoding = (encoding || "base64").toString().toLowerCase().trim();
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if (encoding === "qp") {
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return this._addQPSoftLinebreaks(str, lineLengthMax);
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} else {
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return this._addBase64SoftLinebreaks(str, lineLengthMax);
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}
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}
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/**
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* Adds soft line breaks to a base64 string.
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*
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* @private
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* @param {string} base64EncodedStr
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* @param {number} lineLengthMax
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* @returns {string}
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*/
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_addBase64SoftLinebreaks(base64EncodedStr, lineLengthMax) {
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base64EncodedStr = (base64EncodedStr || "").toString().trim();
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return base64EncodedStr.replace(new RegExp(".{" + lineLengthMax + "}", "g"), "$&\r\n").trim();
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}
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/**
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* Adds soft line breaks to a quoted printable string.
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*
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* @private
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* @param {string} mimeEncodedStr
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* @param {number} lineLengthMax
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* @returns {string}
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*/
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_addQPSoftLinebreaks(mimeEncodedStr, lineLengthMax) {
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const len = mimeEncodedStr.length,
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lineMargin = Math.floor(lineLengthMax / 3);
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let pos = 0,
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match, code, line,
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result = "";
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// insert soft linebreaks where needed
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while (pos < len) {
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line = mimeEncodedStr.substr(pos, lineLengthMax);
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if ((match = line.match(/\r\n/))) {
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line = line.substr(0, match.index + match[0].length);
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result += line;
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pos += line.length;
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continue;
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}
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if (line.substr(-1) === "\n") {
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// nothing to change here
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result += line;
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pos += line.length;
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continue;
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} else if ((match = line.substr(-lineMargin).match(/\n.*?$/))) {
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// truncate to nearest line break
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line = line.substr(0, line.length - (match[0].length - 1));
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result += line;
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pos += line.length;
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continue;
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} else if (line.length > lineLengthMax - lineMargin && (match = line.substr(-lineMargin).match(/[ \t.,!?][^ \t.,!?]*$/))) {
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// truncate to nearest space
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line = line.substr(0, line.length - (match[0].length - 1));
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} else if (line.substr(-1) === "\r") {
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line = line.substr(0, line.length - 1);
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} else {
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if (line.match(/=[\da-f]{0,2}$/i)) {
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// push incomplete encoding sequences to the next line
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if ((match = line.match(/=[\da-f]{0,1}$/i))) {
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line = line.substr(0, line.length - match[0].length);
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}
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// ensure that utf-8 sequences are not split
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while (line.length > 3 && line.length < len - pos && !line.match(/^(?:=[\da-f]{2}){1,4}$/i) && (match = line.match(/=[\da-f]{2}$/ig))) {
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code = parseInt(match[0].substr(1, 2), 16);
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if (code < 128) {
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break;
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}
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line = line.substr(0, line.length - 3);
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if (code >= 0xC0) {
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break;
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}
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}
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}
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}
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if (pos + line.length < len && line.substr(-1) !== "\n") {
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if (line.length === 76 && line.match(/=[\da-f]{2}$/i)) {
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line = line.substr(0, line.length - 3);
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} else if (line.length === 76) {
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line = line.substr(0, line.length - 1);
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}
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pos += line.length;
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line += "=\r\n";
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} else {
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pos += line.length;
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}
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result += line;
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}
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return result;
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}
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}
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export default ToQuotedPrintable;
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