45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
// Return a single-proxy result, which encodes ALL the arguments that were
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// passed to FindProxyForURL().
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function FindProxyForURL(url, host) {
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if (arguments.length != 2) {
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throw "Wrong number of arguments passed to FindProxyForURL!";
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return "FAIL";
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}
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return "PROXY " + makePseudoHost(url + "." + host);
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}
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// Form a string that kind-of resembles a host. We will replace any
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// non-alphanumeric character with a dot, then fix up the oddly placed dots.
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function makePseudoHost(str) {
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var result = "";
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for (var i = 0; i < str.length; ++i) {
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var c = str.charAt(i);
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if (!isValidPseudoHostChar(c)) {
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c = '.'; // Replace unsupported characters with a dot.
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}
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// Take care not to place multiple adjacent dots,
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// a dot at the beginning, or a dot at the end.
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if (c == '.' &&
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(result.length == 0 ||
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i == str.length - 1 ||
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result.charAt(result.length - 1) == '.')) {
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continue;
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}
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result += c;
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}
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return result;
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}
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function isValidPseudoHostChar(c) {
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if (c >= '0' && c <= '9')
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return true;
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if (c >= 'a' && c <= 'z')
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return true;
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if (c >= 'A' && c <= 'Z')
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return true;
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return false;
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}
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