123 lines
3.1 KiB
JavaScript
123 lines
3.1 KiB
JavaScript
'use strict';
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// TODO detect infinite redirects
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module.exports.compile = module.exports.sortOpts = function (redirects) {
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var dups = {};
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var results = {
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conflicts: {}
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, patterns: []
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, matchesMap: {}
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};
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redirects.forEach(function (r) {
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var bare;
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var www;
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if ('.' === r.id[0]) {
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// for consistency
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// TODO this should happen at the database level
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r.id = '*' + r.id;
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}
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if ('*' === r.id[0]) {
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// TODO check that we are not trying to redirect a tld (.com, .co.uk, .org, etc)
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// tlds should follow the global policy
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if (r.id[1] && '.' !== r.id[1]) {
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// this is not a good place to throw as the consequences of a bug would be
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// very bad, but errors should never be silent, so we'll compromise
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console.warn("[NON-FATAL ERROR]: ignoring redirect pattern '" + r.id + "'");
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results.conflicts[r.id] = r;
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}
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// nix the '*' for easier matching
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r.id = r.id.slice(1);
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if (!r.id) {
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r.id = '*';
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}
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if (dups[r.id]) {
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results.conflicts[r.id] = r;
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console.warn("[NON-FATAL ERROR]: duplicate entry for redirect pattern '" + r.id + "'");
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}
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dups[r.id] = true;
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results.patterns.push(r);
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return;
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}
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bare = r.id.replace(/^www\./i, '');
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www = r.id.replace(/^(www\.)?/i, 'www.');
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if (true === r.value) {
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// implicit add www
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results.matchesMap[bare] = www;
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results.matchesMap[www] = www;
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} else if (false === r.value) {
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// implicit remove www
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results.matchesMap[bare] = bare;
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results.matchesMap[www] = bare;
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} else if (!r.value) {
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// (null, '', 0, undefined)
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// explicitly no change
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results.matchesMap[r.id] = r.id;
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} else {
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// explicit value
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results.matchesMap[r.id] = r.value;
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}
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});
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results.patterns.sort(function (a, b) {
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return b.id.length - a.id.length;
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});
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return results;
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};
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module.exports.redirectTo = function (hostname, opts) {
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var redir = opts.matchesMap[hostname];
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if (redir) {
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if (redir === hostname) {
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return false;
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}
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return redir;
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}
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// longest to shortest
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var hasWww = ('www.' === hostname.slice(0, 4));
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//var noWww = (hasWww && hostname.slice(4)) || hostname;
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//var yesWww = (hasWww && hostname) || ('www.' + hostname);
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redir = false;
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opts.patterns.some(function (r) {
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// r.id begins with a dot, such as '.foo.example.com'
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if (r.id !== hostname.slice(hostname.length - r.id.length)) {
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// except for the default, which is an *
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if ('*' !== r.id) {
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return false;
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}
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}
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if (true === r.value) {
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// implicit add www
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redir = hasWww ? hostname : ('www.' + hostname);
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} else if (false === r.value) {
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// implicit remove www
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redir = hasWww ? hostname.slice(4) : hostname;
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} else if (!r.value) {
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// (null, '', 0, undefined)
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// explicitly no change
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redir = false;
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} else {
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// explicit value
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redir = r.value;
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}
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return true;
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});
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if (redir === hostname) {
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return false;
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}
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return redir;
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};
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