michael@0: //
michael@0: //  HTTP Accept-Language header test
michael@0: //
michael@0: 
michael@0: var testpath = "/bug672448";
michael@0: 
michael@0: function run_test() {
michael@0:   let intlPrefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService).getBranch("intl.");
michael@0: 
michael@0:   // Save old value of preference for later.
michael@0:   let oldPref = intlPrefs.getCharPref("accept_languages");
michael@0: 
michael@0:   // Test different numbers of languages, to test different fractions.
michael@0:   let acceptLangTests = [
michael@0:     "qaa", // 1
michael@0:     "qaa,qab", // 2
michael@0:     "qaa,qab,qac,qad", // 4
michael@0:     "qaa,qab,qac,qad,qae,qaf,qag,qah", // 8
michael@0:     "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj", // 10
michael@0:     "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj,qak", // 11
michael@0:     "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj,qak,qal,qam,qan,qao,qap,qaq,qar,qas,qat,qau", // 21
michael@0:     oldPref, // Restore old value of preference (and test it).
michael@0:   ];
michael@0: 
michael@0:   let acceptLangTestsNum = acceptLangTests.length;
michael@0: 
michael@0:   for (let i = 0; i < acceptLangTestsNum; i++) {
michael@0:     // Set preference to test value.
michael@0:     intlPrefs.setCharPref("accept_languages", acceptLangTests[i]);
michael@0: 
michael@0:     // Test value.
michael@0:     test_accepted_languages();
michael@0:   }
michael@0: }
michael@0: 
michael@0: function test_accepted_languages() {
michael@0:   let channel = setupChannel(testpath);
michael@0: 
michael@0:   let AcceptLanguage = channel.getRequestHeader("Accept-Language");
michael@0: 
michael@0:   let acceptedLanguages = AcceptLanguage.split(",");
michael@0: 
michael@0:   let acceptedLanguagesLength = acceptedLanguages.length;
michael@0: 
michael@0:   for (let i = 0; i < acceptedLanguagesLength; i++) {
michael@0:     let acceptedLanguage, qualityValue;
michael@0: 
michael@0:     try {
michael@0:       // The q-value must conform to the definition in HTTP/1.1 Section 3.9.
michael@0:       [_, acceptedLanguage, qualityValue] = acceptedLanguages[i].trim().match(/^([a-z0-9_-]*?)(?:;q=(1(?:\.0{0,3})?|0(?:\.[0-9]{0,3})))?$/i);
michael@0:     } catch(e) {
michael@0:       do_throw("Invalid language tag or quality value: " + e);
michael@0:     }
michael@0: 
michael@0:     if (i == 0) {
michael@0:       // The first language shouldn't have a quality value.
michael@0:       do_check_eq(qualityValue, undefined);
michael@0:     } else {
michael@0:       let decimalPlaces;
michael@0: 
michael@0:       // When the number of languages is small, we keep the quality value to only one decimal place.
michael@0:       // Otherwise, it can be up to two decimal places.
michael@0:       if (acceptedLanguagesLength < 10) {
michael@0:         do_check_true(qualityValue.length == 3);
michael@0: 
michael@0:         decimalPlaces = 1;
michael@0:       } else {
michael@0:         do_check_true(qualityValue.length >= 3);
michael@0:         do_check_true(qualityValue.length <= 4);
michael@0: 
michael@0:         decimalPlaces = 2;
michael@0:       }
michael@0: 
michael@0:       // All the other languages should have an evenly-spaced quality value.
michael@0:       do_check_eq(parseFloat(qualityValue).toFixed(decimalPlaces), (1.0 - ((1 / acceptedLanguagesLength) * i)).toFixed(decimalPlaces));
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: function setupChannel(path) {
michael@0:   let ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
michael@0:   let chan = ios.newChannel("http://localhost:4444" + path, "", null);
michael@0:   chan.QueryInterface(Ci.nsIHttpChannel);
michael@0:   return chan;
michael@0: }