tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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test_header_Accept-Language.js (2912B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 //
      6 //  HTTP Accept-Language header test
      7 //
      8 
      9 "use strict";
     10 
     11 var testpath = "/bug672448";
     12 
     13 function run_test() {
     14  let intlPrefs = Services.prefs.getBranch("intl.");
     15 
     16  // Save old value of preference for later.
     17  let oldPref = intlPrefs.getCharPref("accept_languages");
     18 
     19  // Test different numbers of languages, to test different fractions.
     20  let acceptLangTests = [
     21    "qaa", // 1
     22    "qaa,qab", // 2
     23    "qaa,qab,qac,qad", // 4
     24    "qaa,qab,qac,qad,qae,qaf,qag,qah", // 8
     25    "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj", // 10
     26    "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj,qak", // 11
     27    "qaa,qab,qac,qad,qae,qaf,qag,qah,qai,qaj,qak,qal,qam,qan,qao,qap,qaq,qar,qas,qat,qau", // 21
     28    oldPref, // Restore old value of preference (and test it).
     29  ];
     30 
     31  let acceptLangTestsNum = acceptLangTests.length;
     32 
     33  for (let i = 0; i < acceptLangTestsNum; i++) {
     34    // Set preference to test value.
     35    intlPrefs.setCharPref("accept_languages", acceptLangTests[i]);
     36 
     37    // Test value.
     38    test_accepted_languages();
     39  }
     40 }
     41 
     42 function test_accepted_languages() {
     43  let channel = setupChannel(testpath);
     44 
     45  let AcceptLanguage = channel.getRequestHeader("Accept-Language");
     46 
     47  let acceptedLanguages = AcceptLanguage.split(",");
     48 
     49  let acceptedLanguagesLength = acceptedLanguages.length;
     50 
     51  for (let i = 0; i < acceptedLanguagesLength; i++) {
     52    let qualityValue;
     53 
     54    try {
     55      // The q-value must conform to the definition in HTTP/1.1 Section 3.9.
     56      [, , qualityValue] = acceptedLanguages[i]
     57        .trim()
     58        .match(/^([a-z0-9_-]*?)(?:;q=(1(?:\.0{0,3})?|0(?:\.[0-9]{0,3})))?$/i);
     59    } catch (e) {
     60      do_throw("Invalid language tag or quality value: " + e);
     61    }
     62 
     63    if (i == 0) {
     64      // The first language shouldn't have a quality value.
     65      Assert.equal(qualityValue, undefined);
     66    } else {
     67      let decimalPlaces;
     68 
     69      // When the number of languages is small, we keep the quality value to only one decimal place.
     70      // Otherwise, it can be up to two decimal places.
     71      if (acceptedLanguagesLength < 10) {
     72        Assert.equal(qualityValue.length, 3);
     73 
     74        decimalPlaces = 1;
     75      } else {
     76        Assert.greaterOrEqual(qualityValue.length, 3);
     77        Assert.lessOrEqual(qualityValue.length, 4);
     78 
     79        decimalPlaces = 2;
     80      }
     81 
     82      // All the other languages should have an evenly-spaced quality value.
     83      Assert.equal(
     84        parseFloat(qualityValue).toFixed(decimalPlaces),
     85        Math.max(1.0 - i * 0.1, 0.1).toFixed(decimalPlaces)
     86      );
     87    }
     88  }
     89 }
     90 
     91 function setupChannel(path) {
     92  let chan = NetUtil.newChannel({
     93    uri: "http://localhost:4444" + path,
     94    loadUsingSystemPrincipal: true,
     95  });
     96 
     97  chan.QueryInterface(Ci.nsIHttpChannel);
     98  return chan;
     99 }