The Tor Browser: netwerk/test/unit/test_header_Accept-Language.js@ca08bd8f51b2

     1 //

     2 //  HTTP Accept-Language header test

     3 //

     5 var testpath = "/bug672448";

     7 function run_test() {

     8   let intlPrefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService).getBranch("intl.");

    10   // Save old value of preference for later.

    11   let oldPref = intlPrefs.getCharPref("accept_languages");

    13   // Test different numbers of languages, to test different fractions.

    14   let acceptLangTests = [

    15     "qaa", // 1

    16     "qaa,qab", // 2

    17     "qaa,qab,qac,qad", // 4

    18     "qaa,qab,qac,qad,qae,qaf,qag,qah", // 8

    19     "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj", // 10

    20     "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj,qak", // 11

    21     "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj,qak,qal,qam,qan,qao,qap,qaq,qar,qas,qat,qau", // 21

    22     oldPref, // Restore old value of preference (and test it).

    23   ];

    25   let acceptLangTestsNum = acceptLangTests.length;

    27   for (let i = 0; i < acceptLangTestsNum; i++) {

    28     // Set preference to test value.

    29     intlPrefs.setCharPref("accept_languages", acceptLangTests[i]);

    31     // Test value.

    32     test_accepted_languages();

    33   }

    34 }

    36 function test_accepted_languages() {

    37   let channel = setupChannel(testpath);

    39   let AcceptLanguage = channel.getRequestHeader("Accept-Language");

    41   let acceptedLanguages = AcceptLanguage.split(",");

    43   let acceptedLanguagesLength = acceptedLanguages.length;

    45   for (let i = 0; i < acceptedLanguagesLength; i++) {

    46     let acceptedLanguage, qualityValue;

    48     try {

    49       // The q-value must conform to the definition in HTTP/1.1 Section 3.9.

    50       [_, acceptedLanguage, qualityValue] = acceptedLanguages[i].trim().match(/^([a-z0-9_-]*?)(?:;q=(1(?:\.0{0,3})?|0(?:\.[0-9]{0,3})))?$/i);

    51     } catch(e) {

    52       do_throw("Invalid language tag or quality value: " + e);

    53     }

    55     if (i == 0) {

    56       // The first language shouldn't have a quality value.

    57       do_check_eq(qualityValue, undefined);

    58     } else {

    59       let decimalPlaces;

    61       // When the number of languages is small, we keep the quality value to only one decimal place.

    62       // Otherwise, it can be up to two decimal places.

    63       if (acceptedLanguagesLength < 10) {

    64         do_check_true(qualityValue.length == 3);

    66         decimalPlaces = 1;

    67       } else {

    68         do_check_true(qualityValue.length >= 3);

    69         do_check_true(qualityValue.length <= 4);

    71         decimalPlaces = 2;

    72       }

    74       // All the other languages should have an evenly-spaced quality value.

    75       do_check_eq(parseFloat(qualityValue).toFixed(decimalPlaces), (1.0 - ((1 / acceptedLanguagesLength) * i)).toFixed(decimalPlaces));

    76     }

    77   }

    78 }

    80 function setupChannel(path) {

    81   let ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);

    82   let chan = ios.newChannel("http://localhost:4444" + path, "", null);

    83   chan.QueryInterface(Ci.nsIHttpChannel);

    84   return chan;

    85 }

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