// filename: setmirror1.js // // // "Setting e-print archive mirrors, part 1" // // JavaScript code Copyright 1999 by David R. Morrison. // (Incorporates public domain cookie functions written by // Bill Dortch, hIdaho Design , and // documented at .) // // Permission is granted to use, but not to modify, this code, // provided that the code -- including comments and copyright notice -- // is reproduced completely, and that the author David R. Morrison // is notified by email of all such uses. // // Version 1.0, 30 March 1999. // // Usage: The script should be called in the of an document, // and must be preceded by the line // // // // (so that older browsers will do something reasonable). // // This script will // (1) Define the function "changeMirror" used in part 2 of the script // (2) Look for a cookie called "mirror", set "chosenMirror" to the // cookie's value if that value is one of the valid mirrors of // xxx.lanl.gov, otherwise set "chosenMirror" to xxx.lanl.gov // (3) Determine the index value within mirrorArray corresponding to // "chosenMirror" and set "goodIndex" to that value // (4) Reset the base href value to that of the desired mirror site // mirrorArray = new Array( "xxx.adelaide.edu.au", "xxx.if.usp.br", "xxx.itp.ac.cn", "xxx.lpthe.jussieu.fr", "xxx.uni-augsburg.de", "xxx.imsc.ernet.in", "xxx.tau.ac.il", "xxx.sissa.it", "xxx.yukawa.kyoto-u.ac.jp", "xxx.itep.ru", "xxx.snu.ac.kr", "xxx.unizar.es", "xxx.sf.nchc.gov.tw", "xxx.soton.ac.uk", "xxx.lanl.gov") // First we load Bill Dortch's cookie functions function getCookieVal (offset) { var endstr = document.cookie.indexOf (";", offset); if (endstr == -1) endstr = document.cookie.length; return unescape(document.cookie.substring(offset, endstr)); } function FixCookieDate (date) { var base = new Date(0); var skew = base.getTime(); // dawn of (Unix) time - should be 0 if (skew > 0) // Except on the Mac - ahead of its time date.setTime (date.getTime() - skew); } function GetCookie (name) { var arg = name + "="; var alen = arg.length; var clen = document.cookie.length; var i = 0; while (i < clen) { var j = i + alen; if (document.cookie.substring(i, j) == arg) return getCookieVal (j); i = document.cookie.indexOf(" ", i) + 1; if (i == 0) break; } return null; } function SetCookie (name,value,expires,path,domain,secure) { document.cookie = name + "=" + escape (value) + ((expires) ? "; expires=" + expires.toGMTString() : "") + ((path) ? "; path=" + path : "") + ((domain) ? "; domain=" + domain : "") + ((secure) ? "; secure" : ""); } function DeleteCookie (name,path,domain) { if (GetCookie(name)) { document.cookie = name + "=" + ((path) ? "; path=" + path : "") + ((domain) ? "; domain=" + domain : "") + "; expires=Thu, 01-Jan-70 00:00:01 GMT"; } } // Now we define "changeMirror", first setting up the expiration date var expdate = new Date (); FixCookieDate (expdate); // Correct for Mac date bug expdate.setTime (expdate.getTime() + (365 * 24 * 60 * 60 * 1000)); // + 1 year function changeMirror(newvalue){ SetCookie("mirror", newvalue, expdate, "/") return true} // next we determine the desired mirror, and fixup the cookie if necessary chosenMirror=GetCookie("mirror"); if (chosenMirror == null) chosenMirror="xxx.lanl.gov" badMirror = true for (var i = 0; i < mirrorArray.length; i++) { if (chosenMirror == mirrorArray[i]) badMirror = false} if (badMirror) DeleteCookie("mirror") if (badMirror) chosenMirror = "xxx.lanl.gov" // Determine which element in the array corresponds to the chosen mirror for (var i = 0; i < mirrorArray.length; i++) { if (chosenMirror == mirrorArray[i]) goodIndex = i} // Finally, modify the base href to be that of the chosen mirror document.writeln("")