65 lines
1.8 KiB
JavaScript
65 lines
1.8 KiB
JavaScript
"use strict";
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const URI = require("urijs");
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// Known schemes to detect in a text. If a text contains `foo...bar://foo.com`,
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// the parsed scheme should be `foo...bar` but if it contains
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// `foo...http://foo.com`, we assume the scheme to extract will be `http`.
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const commonSchemes = [
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"http", "https",
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"ftp", "sftp",
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"smb", "file",
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"irc", "ircs",
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"svn", "git",
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"steam", "mumble", "ts3server",
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"svn+ssh", "ssh",
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];
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function findLinks(text) {
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const result = [];
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// URI.withinString() identifies URIs within text, e.g. to translate them to
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// <a>-Tags.
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// See https://medialize.github.io/URI.js/docs.html#static-withinString
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// In our case, we store each URI encountered in a result array.
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URI.withinString(text, function(url, start, end) {
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let parsedScheme;
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try {
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// Extract the scheme of the URL detected, if there is one
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parsedScheme = URI(url).scheme().toLowerCase();
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} catch (e) {
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// URI may throw an exception for malformed urls,
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// as to why withinString finds these in the first place is a mystery
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return;
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}
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// Check if the scheme of the detected URL matches a common one above.
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// In a URL like `foo..http://example.com`, the scheme would be `foo..http`,
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// so we need to clean up the end of the scheme and filter out the rest.
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const matchedScheme = commonSchemes.find((scheme) => parsedScheme.endsWith(scheme));
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// A known scheme was found, extract the unknown part from the URL
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if (matchedScheme) {
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const prefix = parsedScheme.length - matchedScheme.length;
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start += prefix;
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url = url.slice(prefix);
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}
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// The URL matched but does not start with a scheme (`www.foo.com`), add it
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if (!parsedScheme.length) {
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url = "http://" + url;
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}
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result.push({
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start: start,
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end: end,
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link: url
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});
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});
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return result;
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}
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module.exports = findLinks;
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