refactor app.js

2026-05-17 23:24:44 +02:00 · 2021-08-24 12:13:52 +02:00
parent cde9214579
commit 80678c51a8
3 changed files with 153 additions and 76 deletions
@@ -0,0 +1,104 @@
+function urlRel2abs(url) {
+  /* Only accept commonly trusted protocols:
+   * Only data-image URLs are accepted, Exotic flavours (escaped slash,
+   * html-entitied characters) are not supported to keep the function fast */
+  if (
+    /^(https?|file|ftps?|mailto|javascript|data:image\/[^;]{2,9};):/i.test(url)
+  ) {
+    return url; //Url is already absolute
+  }
+  var base_url = location.href.match(/^(.+)\/?(?:#.+)?$/)[0] + "/";
+  if (url.substring(0, 2) == "//") return location.protocol + url;
+  else if (url.charAt(0) == "/")
+    return location.protocol + "//" + location.host + url;
+  else if (url.substring(0, 2) == "./") url = "." + url;
+  else if (/^\s*$/.test(url)) return "";
+  //Empty = Return nothing
+  else url = "../" + url;
+
+  url = base_url + url;
+  var i = 0;
+  while (/\/\.\.\//.test((url = url.replace(/[^\/]+\/+\.\.\//g, ""))));
+
+  /* Escape certain characters to prevent XSS */
+  url = url
+    .replace(/\.$/, "")
+    .replace(/\/\./g, "")
+    .replace(/"/g, "%22")
+    .replace(/'/g, "%27")
+    .replace(/</g, "%3C")
+    .replace(/>/g, "%3E");
+  return url;
+}
+
+const charactersAttributes = "[^-a-z0-9:._]";
+const allTagCharacters = "(?:[^>\"']*(?:\"[^\"]*\"|'[^']*'))*?[^>]*";
+
+function by(match, group1, group2, group3) {
+  /* Note that this function can also be used to remove links:
+   * return group1 + "javascript://" + group3; */
+  return group1 + urlRel2abs(group2) + group3;
+}
+
+function cr(html, selector, attribute) {
+  if (typeof selector == "string") selector = new RegExp(selector, "gi");
+  attribute = charactersAttributes + attribute;
+  const marker = "\\s*=\\s*";
+  const end = ")(";
+  var re1 = new RegExp("(" + attribute + marker + '")([^"]+)()', "gi");
+  var re2 = new RegExp("(" + attribute + marker + "')([^']+)()", "gi");
+  var re3 = new RegExp(
+    "(" + attribute + marker + ")([^\"'][^\\s>]*" + end + ")",
+    "gi"
+  );
+  html = html.replace(selector, function (match) {
+    return match.replace(re1, by).replace(re2, by).replace(re3, by);
+  });
+  return html;
+}
+
+function contentAbs2Relative(content) {
+  if (!content) return content;
+  content = cr(
+    content,
+    "<" +
+      allTagCharacters +
+      charactersAttributes +
+      "href\\s*=" +
+      allTagCharacters +
+      ">",
+    "href"
+  );
+  content = cr(
+    content,
+    "<" +
+      allTagCharacters +
+      charactersAttributes +
+      "src\\s*=" +
+      allTagCharacters +
+      ">",
+    "src"
+  );
+  return content;
+}
+
+function generateRandomId(length) {
+  const alphabet = "ABCDEF0123456789";
+  let output = "";
+  for (let index = 0; index < length; index++) {
+    output += alphabet[Math.round(Math.random() * (alphabet.length - 1))];
+  }
+  return output;
+}
+
+function parseGithubUrl(url) {
+  var matches = url.match(/.*?github.com\/([\w-\._]+)\/([\w-\._]+)/);
+  if (matches && matches.length == 3) {
+    return {
+      owner: matches[1],
+      repo: matches[2],
+    };
+  } else {
+    throw "Invalid url";
+  }
+}