40 lines
2.0 KiB
JavaScript
40 lines
2.0 KiB
JavaScript
// checks whether or not the url is external to the local site.
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// generously provided by StackOverflow: http://stackoverflow.com/questions/6238351/fastest-way-to-detect-external-urls
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window.isExternal = function(url) {
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// parse the url into protocol, host, path, query, and fragment. More information can be found here: http://tools.ietf.org/html/rfc3986#appendix-B
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var match = url.match(/^([^:\/?#]+:)?(?:\/\/([^\/?#]*))?([^?#]+)?(\?[^#]*)?(#.*)?/);
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// match[1] matches a protocol if one exists in the url
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// if the protocol in the url does not match the protocol in the window's location, this url is considered external
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if (typeof match[1] === 'string' &&
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match[1].length > 0 &&
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match[1].toLowerCase() !== location.protocol) { return true; }
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// match[2] matches the host if one exists in the url
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// if the host in the url does not match the host of the window location, this url is considered external
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if (typeof match[2] === 'string' &&
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match[2].length > 0 &&
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// this regex removes the port number if it patches the current location's protocol
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match[2].replace(new RegExp(':(' + {'http:': 80, 'https:': 443}[location.protocol] + ')?$'), '') !== location.host) { return true; }
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return false;
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};
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// Utility method for replacing a portion of a string.
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window.rewriteStaticLinks = function(content, from, to) {
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if (from === null || to === null) {
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return content;
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}
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// replace only relative urls
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function replacer(match) {
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if (match === from) {
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return to;
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} else {
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return match;
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}
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}
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// change all relative urls only which may be embedded inside other tags in content.
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// handle http and https
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// escape all regex interpretable chars
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fromRe = from.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
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var regex = new RegExp('(https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}([-a-zA-Z0-9@:%_\+.~#?&//=]*))?' + fromRe, 'g');
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return content.replace(regex, replacer);
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};
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