updated bunch of file paths and changed the way posts are loaded

node_modules/libmime/src/charset.js

@@ -0,0 +1,85 @@
+'use strict';
+
+var iconv = require('iconv-lite');
+
+/**
+ * Character set encoding and decoding functions
+ */
+var charset = module.exports = {
+
+    /**
+     * Encodes an unicode string into an Buffer object as UTF-8
+     *
+     * We force UTF-8 here, no strange encodings allowed.
+     *
+     * @param {String} str String to be encoded
+     * @return {Buffer} UTF-8 encoded typed array
+     */
+    encode: function(str) {
+        return new Buffer(str, 'utf-8');
+    },
+
+    /**
+     * Decodes a string from Buffer to an unicode string using specified encoding
+     *
+     * @param {Buffer} buf Binary data to be decoded
+     * @param {String} [fromCharset='UTF-8'] Binary data is decoded into string using this charset
+     * @return {String} Decded string
+     */
+    decode: function(buf, fromCharset) {
+        fromCharset = charset.normalizeCharset(fromCharset || 'UTF-8');
+
+        if (/^(us\-)?ascii|utf\-8|7bit$/i.test(fromCharset)) {
+            return buf.toString('utf-8');
+        }
+
+        return iconv.decode(buf, fromCharset);
+    },
+
+    /**
+     * Convert a string from specific encoding to UTF-8 Buffer
+     *
+     * @param {String|Buffer} str String to be encoded
+     * @param {String} [fromCharset='UTF-8'] Source encoding for the string
+     * @return {Buffer} UTF-8 encoded typed array
+     */
+    convert: function(data, fromCharset) {
+        fromCharset = charset.normalizeCharset(fromCharset || 'UTF-8');
+
+        var bufString;
+
+        if (typeof data !== 'string') {
+            if (/^(us\-)?ascii|utf\-8|7bit$/i.test(fromCharset)) {
+                return data;
+            }
+            bufString = charset.decode(data, fromCharset);
+            return charset.encode(bufString);
+        }
+        return charset.encode(data);
+    },
+
+    /**
+     * Converts well known invalid character set names to proper names.
+     * eg. win-1257 will be converted to WINDOWS-1257
+     *
+     * @param {String} charset Charset name to convert
+     * @return {String} Canoninicalized charset name
+     */
+    normalizeCharset: function(charset) {
+        var match;
+
+        if ((match = charset.match(/^utf[\-_]?(\d+)$/i))) {
+            return 'UTF-' + match[1];
+        }
+
+        if ((match = charset.match(/^win[\-_]?(\d+)$/i))) {
+            return 'WINDOWS-' + match[1];
+        }
+
+        if ((match = charset.match(/^latin[\-_]?(\d+)$/i))) {
+            return 'ISO-8859-' + match[1];
+        }
+
+        return charset;
+    }
+};

node_modules/libmime/src/libmime.js

@@ -0,0 +1,783 @@
+'use strict';
+
+var libcharset = require('./charset');
+var libbase64 = require('libbase64');
+var libqp = require('libqp');
+var mimetypes = require('./mimetypes');
+
+var libmime = module.exports = {
+
+    /**
+     * Checks if a value is plaintext string (uses only printable 7bit chars)
+     *
+     * @param {String} value String to be tested
+     * @returns {Boolean} true if it is a plaintext string
+     */
+    isPlainText: function(value) {
+        if (typeof value !== 'string' || /[\x00-\x08\x0b\x0c\x0e-\x1f\u0080-\uFFFF]/.test(value)) {
+            return false;
+        } else {
+            return true;
+        }
+    },
+
+    /**
+     * Checks if a multi line string containes lines longer than the selected value.
+     *
+     * Useful when detecting if a mail message needs any processing at all –
+     * if only plaintext characters are used and lines are short, then there is
+     * no need to encode the values in any way. If the value is plaintext but has
+     * longer lines then allowed, then use format=flowed
+     *
+     * @param {Number} lineLength Max line length to check for
+     * @returns {Boolean} Returns true if there is at least one line longer than lineLength chars
+     */
+    hasLongerLines: function(str, lineLength) {
+        return new RegExp('^.{' + (lineLength + 1) + ',}', 'm').test(str);
+    },
+
+    /**
+     * Decodes a string from a format=flowed soft wrapping.
+     *
+     * @param {String} str Plaintext string with format=flowed to decode
+     * @param {Boolean} [delSp] If true, delete leading spaces (delsp=yes)
+     * @return {String} Mime decoded string
+     */
+    decodeFlowed: function(str, delSp) {
+        str = (str || '').toString();
+
+        return str.
+        split(/\r?\n/).
+            // remove soft linebreaks
+            // soft linebreaks are added after space symbols
+        reduce(function(previousValue, currentValue, index) {
+                var body = previousValue;
+                if (delSp) {
+                    // delsp adds spaces to text to be able to fold it
+                    // these spaces can be removed once the text is unfolded
+                    body = body.replace(/[ ]+$/, '');
+                }
+                if (/ $/.test(previousValue) && !/(^|\n)\-\- $/.test(previousValue) || index === 1) {
+                    return body + currentValue;
+                } else {
+                    return body + '\n' + currentValue;
+                }
+            }).
+            // remove whitespace stuffing
+            // http://tools.ietf.org/html/rfc3676#section-4.4
+        replace(/^ /gm, '');
+    },
+
+    /**
+     * Adds soft line breaks to content marked with format=flowed to
+     * ensure that no line in the message is never longer than lineLength
+     *
+     * @param {String} str Plaintext string that requires wrapping
+     * @param {Number} [lineLength=76] Maximum length of a line
+     * @return {String} String with forced line breaks
+     */
+    encodeFlowed: function(str, lineLength) {
+        lineLength = lineLength || 76;
+
+        var flowed = [];
+        str.split(/\r?\n/).forEach(function(line) {
+            flowed.push(libmime.foldLines(line.
+                // space stuffing http://tools.ietf.org/html/rfc3676#section-4.2
+                replace(/^( |From|>)/igm, ' $1'),
+                lineLength, true));
+        });
+        return flowed.join('\r\n');
+    },
+
+    /**
+     * Encodes a string or an Buffer to an UTF-8 MIME Word (rfc2047)
+     *
+     * @param {String|Buffer} data String to be encoded
+     * @param {String} mimeWordEncoding='Q' Encoding for the mime word, either Q or B
+     * @param {Number} [maxLength=0] If set, split mime words into several chunks if needed
+     * @return {String} Single or several mime words joined together
+     */
+    encodeWord: function(data, mimeWordEncoding, maxLength) {
+        mimeWordEncoding = (mimeWordEncoding || 'Q').toString().toUpperCase().trim().charAt(0);
+        maxLength = maxLength || 0;
+
+        var encodedStr,
+            toCharset = 'UTF-8',
+            i, len, parts;
+
+        if (maxLength && maxLength > 7 + toCharset.length) {
+            maxLength -= (7 + toCharset.length);
+        }
+
+        if (mimeWordEncoding === 'Q') {
+            // https://tools.ietf.org/html/rfc2047#section-5 rule (3)
+            encodedStr = libqp.encode(data).replace(/[^a-z0-9!*+\-\/=]/ig, function(chr) {
+                var ord = chr.charCodeAt(0).toString(16).toUpperCase();
+                if (chr === ' ') {
+                    return '_';
+                } else {
+                    return '=' + (ord.length === 1 ? '0' + ord : ord);
+                }
+            });
+        } else if (mimeWordEncoding === 'B') {
+            encodedStr = typeof data === 'string' ? data : libbase64.encode(data);
+            maxLength = Math.max(3, (maxLength - maxLength % 4) / 4 * 3);
+        }
+
+        if (maxLength && encodedStr.length > maxLength) {
+            if (mimeWordEncoding === 'Q') {
+                encodedStr = splitMimeEncodedString(encodedStr, maxLength).join('?= =?' + toCharset + '?' + mimeWordEncoding + '?');
+            } else {
+
+                // RFC2047 6.3 (2) states that encoded-word must include an integral number of characters, so no chopping unicode sequences
+                parts = [];
+                for (i = 0, len = encodedStr.length; i < len; i += maxLength) {
+                    parts.push(libbase64.encode(encodedStr.substr(i, maxLength)));
+                }
+
+                if (parts.length > 1) {
+                    encodedStr = parts.join('?= =?' + toCharset + '?' + mimeWordEncoding + '?');
+                } else {
+                    encodedStr = parts.join('');
+                }
+            }
+        } else if (mimeWordEncoding === 'B') {
+            encodedStr = libbase64.encode(data);
+        }
+
+        return '=?' + toCharset + '?' + mimeWordEncoding + '?' + encodedStr + (encodedStr.substr(-2) === '?=' ? '' : '?=');
+    },
+
+    /**
+     * Decode a complete mime word encoded string
+     *
+     * @param {String} str Mime word encoded string
+     * @return {String} Decoded unicode string
+     */
+    decodeWord: function(str) {
+        str = (str || '').toString().trim();
+
+        var fromCharset, encoding, match;
+
+        match = str.match(/^\=\?([\w_\-\*]+)\?([QqBb])\?([^\?]+)\?\=$/i);
+        if (!match) {
+            return str;
+        }
+
+        // RFC2231 added language tag to the encoding
+        // see: https://tools.ietf.org/html/rfc2231#section-5
+        // this implementation silently ignores this tag
+        fromCharset = match[1].split('*').shift();
+
+        encoding = (match[2] || 'Q').toString().toUpperCase();
+        str = (match[3] || '').replace(/_/g, ' ').replace(/ $/, '=20');
+
+        if (encoding === 'B') {
+            return libcharset.decode(libbase64.decode(str), fromCharset);
+        } else if (encoding === 'Q') {
+            return libcharset.decode(libqp.decode(str), fromCharset);
+        } else {
+            return str;
+        }
+    },
+
+    /**
+     * Finds word sequences with non ascii text and converts these to mime words
+     *
+     * @param {String|Buffer} data String to be encoded
+     * @param {String} mimeWordEncoding='Q' Encoding for the mime word, either Q or B
+     * @param {Number} [maxLength=0] If set, split mime words into several chunks if needed
+     * @param {String} [fromCharset='UTF-8'] Source sharacter set
+     * @return {String} String with possible mime words
+     */
+    encodeWords: function(data, mimeWordEncoding, maxLength, fromCharset) {
+        if (!fromCharset && typeof maxLength === 'string' && !maxLength.match(/^[0-9]+$/)) {
+            fromCharset = maxLength;
+            maxLength = undefined;
+        }
+
+        maxLength = maxLength || 0;
+
+        var decodedValue = libcharset.decode(libcharset.convert((data || ''), fromCharset)),
+            encodedValue;
+
+        encodedValue = decodedValue.replace(/([^\s\u0080-\uFFFF]*[\u0080-\uFFFF]+[^\s\u0080-\uFFFF]*(?:\s+[^\s\u0080-\uFFFF]*[\u0080-\uFFFF]+[^\s\u0080-\uFFFF]*\s*)?)+(?=\s|$)/g, function(match) {
+            return match.length ? libmime.encodeWord(match, mimeWordEncoding || 'Q', maxLength) : '';
+        });
+
+        return encodedValue;
+    },
+
+    /**
+     * Decode a string that might include one or several mime words
+     *
+     * @param {String} str String including some mime words that will be encoded
+     * @return {String} Decoded unicode string
+     */
+    decodeWords: function(str) {
+        str = (str || '').toString();
+        str = str.
+        replace(/(=\?[^?]+\?[QqBb]\?[^?]+\?=)\s+(?==\?[^?]+\?[QqBb]\?[^?]+\?=)/g, '$1').
+        replace(/\=\?([\w_\-\*]+)\?([QqBb])\?[^\?]+\?\=/g, function(mimeWord) {
+            return libmime.decodeWord(mimeWord);
+        });
+
+        return str;
+    },
+
+    /**
+     * Splits a string by :
+     * The result is not mime word decoded, you need to do your own decoding based
+     * on the rules for the specific header key
+     *
+     * @param {String} headerLine Single header line, might include linebreaks as well if folded
+     * @return {Object} And object of {key, value}
+     */
+    decodeHeader: function(headerLine) {
+        var line = (headerLine || '').toString().replace(/(?:\r?\n|\r)[ \t]*/g, ' ').trim(),
+            match = line.match(/^\s*([^:]+):(.*)$/),
+            key = (match && match[1] || '').trim().toLowerCase(),
+            value = (match && match[2] || '').trim();
+
+        return {
+            key: key,
+            value: value
+        };
+    },
+
+    /**
+     * Parses a block of header lines. Does not decode mime words as every
+     * header might have its own rules (eg. formatted email addresses and such)
+     *
+     * @param {String} headers Headers string
+     * @return {Object} An object of headers, where header keys are object keys. NB! Several values with the same key make up an Array
+     */
+    decodeHeaders: function(headers) {
+        var lines = headers.split(/\r?\n|\r/),
+            headersObj = {},
+            header,
+            i, len;
+
+        for (i = lines.length - 1; i >= 0; i--) {
+            if (i && lines[i].match(/^\s/)) {
+                lines[i - 1] += '\r\n' + lines[i];
+                lines.splice(i, 1);
+            }
+        }
+
+        for (i = 0, len = lines.length; i < len; i++) {
+            header = libmime.decodeHeader(lines[i]);
+            if (!headersObj[header.key]) {
+                headersObj[header.key] = [header.value];
+            } else {
+                headersObj[header.key].push(header.value);
+            }
+        }
+
+        return headersObj;
+    },
+
+    /**
+     * Joins parsed header value together as 'value; param1=value1; param2=value2'
+     *
+     * @param {Object} structured Parsed header value
+     * @return {String} joined header value
+     */
+    buildHeaderValue: function(structured) {
+        var paramsArray = [];
+
+        Object.keys(structured.params || {}).forEach(function(param) {
+            // filename might include unicode characters so it is a special case
+            var value = structured.params[param];
+            if (!libmime.isPlainText(value) || value.length >= 75) {
+                libmime.buildHeaderParam(param, value, 50).forEach(function(encodedParam) {
+                    if (!/[\s"\\;\/=]|^[\-']|'$/.test(encodedParam.value)) {
+                        paramsArray.push(encodedParam.key + '=' + encodedParam.value);
+                    } else {
+                        paramsArray.push(encodedParam.key + '=' + JSON.stringify(encodedParam.value));
+                    }
+                });
+            } else {
+                if (/[\s'"\\;\/=]|^\-/.test(value)) {
+                    paramsArray.push(param + '=' + JSON.stringify(value));
+                } else {
+                    paramsArray.push(param + '=' + value);
+                }
+            }
+        }.bind(this));
+
+        return structured.value + (paramsArray.length ? '; ' + paramsArray.join('; ') : '');
+    },
+
+    /**
+     * 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 {String} str Header value
+     * @return {Object} Header value as a parsed structure
+     */
+    parseHeaderValue: function(str) {
+        var response = {
+                value: false,
+                params: {}
+            },
+            key = false,
+            value = '',
+            type = 'value',
+            quote = false,
+            escaped = false,
+            chr;
+
+        for (var 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 {
+                        response.params[key] = value.trim();
+                    }
+                    type = 'key';
+                    value = '';
+                } else {
+                    value += chr;
+                }
+                escaped = false;
+
+            }
+        }
+
+        if (type === 'value') {
+            if (key === false) {
+                response.value = value.trim();
+            } else {
+                response.params[key] = value.trim();
+            }
+        } else if (value.trim()) {
+            response.params[value.trim().toLowerCase()] = '';
+        }
+
+        // handle parameter value continuations
+        // https://tools.ietf.org/html/rfc2231#section-3
+
+        // preprocess values
+        Object.keys(response.params).forEach(function(key) {
+            var actualKey, nr, match, value;
+            if ((match = key.match(/(\*(\d+)|\*(\d+)\*|\*)$/))) {
+                actualKey = key.substr(0, match.index);
+                nr = Number(match[2] || match[3]) || 0;
+
+                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(function(key) {
+            var value;
+            if (response.params[key] && Array.isArray(response.params[key].values)) {
+                value = response.params[key].values.map(function(val) {
+                    return 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, function(s) {
+                            var c = s.charCodeAt(0).toString(16);
+                            if (s === ' ') {
+                                return '_';
+                            } else {
+                                return '%' + (c.length < 2 ? '0' : '') + c;
+                            }
+                        }).
+                        // change from urlencoding to percent encoding
+                    replace(/%/g, '=') +
+                        '?=';
+                } else {
+                    response.params[key] = value;
+                }
+            }
+        }.bind(this));
+
+        return response;
+    },
+
+    /**
+     * Encodes a string or an Buffer to an UTF-8 Parameter Value Continuation encoding (rfc2231)
+     * Useful for splitting long parameter values.
+     *
+     * For example
+     *      title="unicode string"
+     * becomes
+     *     title*0*=utf-8''unicode
+     *     title*1*=%20string
+     *
+     * @param {String|Buffer} data String to be encoded
+     * @param {Number} [maxLength=50] Max length for generated chunks
+     * @param {String} [fromCharset='UTF-8'] Source sharacter set
+     * @return {Array} A list of encoded keys and headers
+     */
+    buildHeaderParam: function(key, data, maxLength, fromCharset) {
+        var list = [];
+        var encodedStr = typeof data === 'string' ? data : libmime.decode(data, fromCharset);
+        var encodedStrArr;
+        var chr, ord;
+        var line;
+        var startPos = 0;
+        var isEncoded = false;
+        var i, len;
+
+        maxLength = maxLength || 50;
+
+        // process ascii only text
+        if (libmime.isPlainText(data)) {
+
+            // check if conversion is even needed
+            if (encodedStr.length <= maxLength) {
+                return [{
+                    key: key,
+                    value: encodedStr
+                }];
+            }
+
+            encodedStr = encodedStr.replace(new RegExp('.{' + maxLength + '}', 'g'), function(str) {
+                list.push({
+                    line: str
+                });
+                return '';
+            });
+
+            if (encodedStr) {
+                list.push({
+                    line: encodedStr
+                });
+            }
+
+        } else {
+
+            if (/[\uD800-\uDBFF]/.test(encodedStr)) {
+                // string containts surrogate pairs, so normalize it to an array of bytes
+                encodedStrArr = [];
+                for (i = 0, len = encodedStr.length; i < len; i++) {
+                    chr = encodedStr.charAt(i);
+                    ord = chr.charCodeAt(0);
+                    if (ord >= 0xD800 && ord <= 0xDBFF && i < len - 1) {
+                        chr += encodedStr.charAt(i + 1);
+                        encodedStrArr.push(chr);
+                        i++;
+                    } else {
+                        encodedStrArr.push(chr);
+                    }
+                }
+                encodedStr = encodedStrArr;
+            }
+
+            // first line includes the charset and language info and needs to be encoded
+            // even if it does not contain any unicode characters
+            line = 'utf-8\'\'';
+            isEncoded = true;
+            startPos = 0;
+
+            // process text with unicode or special chars
+            for (i = 0, len = encodedStr.length; i < len; i++) {
+
+                chr = encodedStr[i];
+
+                if (isEncoded) {
+                    chr = safeEncodeURIComponent(chr);
+                } else {
+                    // try to urlencode current char
+                    chr = chr === ' ' ? chr : safeEncodeURIComponent(chr);
+                    // By default it is not required to encode a line, the need
+                    // only appears when the string contains unicode or special chars
+                    // 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: line,
+                                encoded: isEncoded
+                            });
+                            line = '';
+                            startPos = i - 1;
+                        } else {
+                            isEncoded = 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: line,
+                        encoded: isEncoded
+                    });
+                    line = chr = encodedStr[i] === ' ' ? ' ' : safeEncodeURIComponent(encodedStr[i]);
+                    if (chr === encodedStr[i]) {
+                        isEncoded = false;
+                        startPos = i - 1;
+                    } else {
+                        isEncoded = true;
+                    }
+                } else {
+                    line += chr;
+                }
+            }
+
+            if (line) {
+                list.push({
+                    line: line,
+                    encoded: isEncoded
+                });
+            }
+        }
+
+        return list.map(function(item, i) {
+            return {
+                // 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
+            };
+        });
+    },
+
+
+    /**
+     * Returns file extension for a content type string. If no suitable extensions
+     * are found, 'bin' is used as the default extension
+     *
+     * @param {String} mimeType Content type to be checked for
+     * @return {String} File extension
+     */
+    detectExtension: function(mimeType) {
+        mimeType = (mimeType || '').toString().toLowerCase().replace(/\s/g, '');
+        if (!(mimeType in mimetypes.list)) {
+            return 'bin';
+        }
+
+        if (typeof mimetypes.list[mimeType] === 'string') {
+            return mimetypes.list[mimeType];
+        }
+
+        var mimeParts = mimeType.split('/');
+
+        // search for name match
+        for (var i = 0, len = mimetypes.list[mimeType].length; i < len; i++) {
+            if (mimeParts[1] === mimetypes.list[mimeType][i]) {
+                return mimetypes.list[mimeType][i];
+            }
+        }
+
+        // use the first one
+        return mimetypes.list[mimeType][0] !== '*' ? mimetypes.list[mimeType][0] : 'bin';
+    },
+
+    /**
+     * 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 {String} extension Extension to be checked for
+     * @return {String} File extension
+     */
+    detectMimeType: function(extension) {
+        extension = (extension || '').toString().toLowerCase().replace(/\s/g, '').replace(/^\./g, '').split('.').pop();
+
+        if (!(extension in mimetypes.extensions)) {
+            return 'application/octet-stream';
+        }
+
+        if (typeof mimetypes.extensions[extension] === 'string') {
+            return mimetypes.extensions[extension];
+        }
+
+        var mimeParts;
+
+        // search for name match
+        for (var i = 0, len = mimetypes.extensions[extension].length; i < len; i++) {
+            mimeParts = mimetypes.extensions[extension][i].split('/');
+            if (mimeParts[1] === extension) {
+                return mimetypes.extensions[extension][i];
+            }
+        }
+
+        // use the first one
+        return mimetypes.extensions[extension][0];
+    },
+
+    /**
+     * Folds long lines, useful for folding header lines (afterSpace=false) and
+     * flowed text (afterSpace=true)
+     *
+     * @param {String} str String to be folded
+     * @param {Number} [lineLength=76] Maximum length of a line
+     * @param {Boolean} afterSpace If true, leave a space in th end of a line
+     * @return {String} String with folded lines
+     */
+    foldLines: function(str, lineLength, afterSpace) {
+        str = (str || '').toString();
+        lineLength = lineLength || 76;
+
+        var pos = 0,
+            len = str.length,
+            result = '',
+            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 {String} str Mime encoded string to be split up
+ * @param {Number} maxlen Maximum length of characters for one part (minimum 12)
+ * @return {Array} Split string
+ */
+function splitMimeEncodedString(str, maxlen) {
+    var curLine, match, chr, done,
+        lines = [];
+
+    // 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);
+        }
+
+        done = false;
+        while (!done) {
+            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) {
+            lines.push(curLine);
+        }
+        str = str.substr(curLine.length);
+    }
+
+    return lines;
+}
+
+function encodeURICharComponent(chr) {
+    var i, len, ord;
+    var res = '';
+
+    ord = chr.charCodeAt(0).toString(16).toUpperCase();
+    if (ord.length % 2) {
+        ord = '0' + ord;
+    }
+    if (ord.length > 2) {
+        for (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) {
+        // should never run
+        return str.replace(/[^\x00-\x1F *'()<>@,;:\\"\[\]?=\u007F-\uFFFF]+/g, '');
+    }
+
+    // ensure chars that are not handled by encodeURICompent are converted as well
+    return str.replace(/[\x00-\x1F *'()<>@,;:\\"\[\]?=\u007F-\uFFFF]/g, encodeURICharComponent);
+}