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common.js
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common.js
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import DOMPurify from 'dompurify';
/**
* Gets the number of lines in a string
*
* @param {string | undefined} s The string to check the lines for
* @returns {number} The number of lines in that string
*/
export const getRows = (s) => {
if (!s) return 1;
let str = breakToPlaceholder(s);
str = str.replace(/\\n/g, '#br#');
return str.split('#br#');
};
export const removeEscapes = (text) => {
let newStr = text.replace(/\\u[\dA-F]{4}/gi, function (match) {
return String.fromCharCode(parseInt(match.replace(/\\u/g, ''), 16));
});
newStr = newStr.replace(/\\x([0-9a-f]{2})/gi, (_, c) => String.fromCharCode(parseInt(c, 16)));
newStr = newStr.replace(/\\[\d\d\d]{3}/gi, function (match) {
return String.fromCharCode(parseInt(match.replace(/\\/g, ''), 8));
});
newStr = newStr.replace(/\\[\d\d\d]{2}/gi, function (match) {
return String.fromCharCode(parseInt(match.replace(/\\/g, ''), 8));
});
return newStr;
};
/**
* Removes script tags from a text
*
* @param {string} txt The text to sanitize
* @returns {string} The safer text
*/
export const removeScript = (txt) => {
var rs = '';
var idx = 0;
while (idx >= 0) {
idx = txt.indexOf('<script');
if (idx >= 0) {
rs += txt.substr(0, idx);
txt = txt.substr(idx + 1);
idx = txt.indexOf('</script>');
if (idx >= 0) {
idx += 9;
txt = txt.substr(idx);
}
} else {
rs += txt;
idx = -1;
break;
}
}
let decodedText = removeEscapes(rs);
decodedText = decodedText.replaceAll(/script>/gi, '#');
decodedText = decodedText.replaceAll(/javascript:/gi, '#');
decodedText = decodedText.replaceAll(/javascript&colon/gi, '#');
decodedText = decodedText.replaceAll(/onerror=/gi, 'onerror:');
decodedText = decodedText.replaceAll(/<iframe/gi, '');
return decodedText;
};
const sanitizeMore = (text, config) => {
let txt = text;
let htmlLabels = true;
if (
config.flowchart &&
(config.flowchart.htmlLabels === false || config.flowchart.htmlLabels === 'false')
) {
htmlLabels = false;
}
if (htmlLabels) {
const level = config.securityLevel;
if (level === 'antiscript' || level === 'strict') {
txt = removeScript(txt);
} else if (level !== 'loose') {
// eslint-disable-line
txt = breakToPlaceholder(txt);
txt = txt.replace(/</g, '<').replace(/>/g, '>');
txt = txt.replace(/=/g, '=');
txt = placeholderToBreak(txt);
}
}
return txt;
};
export const sanitizeText = (text, config) => {
if (!text) return text;
let txt = '';
if (config['dompurifyConfig']) {
txt = DOMPurify.sanitize(sanitizeMore(text, config), config['dompurifyConfig']);
} else {
txt = DOMPurify.sanitize(sanitizeMore(text, config));
}
return txt;
};
export const sanitizeTextOrArray = (a, config) => {
if (typeof a === 'string') return sanitizeText(a, config);
const f = (x) => sanitizeText(x, config);
return a.flat().map(f);
};
export const lineBreakRegex = /<br\s*\/?>/gi;
/**
* Whether or not a text has any linebreaks
*
* @param {string} text The text to test
* @returns {boolean} Whether or not the text has breaks
*/
export const hasBreaks = (text) => {
return lineBreakRegex.test(text);
};
/**
* Splits on <br> tags
*
* @param {string} text Text to split
* @returns {string[]} List of lines as strings
*/
export const splitBreaks = (text) => {
return text.split(lineBreakRegex);
};
/**
* Converts placeholders to linebreaks in HTML
*
* @param {string} s HTML with placeholders
* @returns {string} HTML with breaks instead of placeholders
*/
const placeholderToBreak = (s) => {
return s.replace(/#br#/g, '<br/>');
};
/**
* Opposite of `placeholderToBreak`, converts breaks to placeholders
*
* @param {string} s HTML string
* @returns {string} String with placeholders
*/
const breakToPlaceholder = (s) => {
return s.replace(lineBreakRegex, '#br#');
};
/**
* Gets the current URL
*
* @param {boolean} useAbsolute Whether to return the absolute URL or not
* @returns {string} The current URL
*/
const getUrl = (useAbsolute) => {
let url = '';
if (useAbsolute) {
url =
window.location.protocol +
'//' +
window.location.host +
window.location.pathname +
window.location.search;
url = url.replace(/\(/g, '\\(');
url = url.replace(/\)/g, '\\)');
}
return url;
};
/**
* Converts a string/boolean into a boolean
*
* @param {string | boolean} val String or boolean to convert
* @returns {boolean} The result from the input
*/
export const evaluate = (val) => (val === 'false' || val === false ? false : true);
export default {
getRows,
sanitizeText,
sanitizeTextOrArray,
hasBreaks,
splitBreaks,
lineBreakRegex,
removeScript,
getUrl,
evaluate,
removeEscapes,
};