Translate the Kibana welcome message

Translates the start-up message (“Kibana is loading ...”)in the Jade template.

To be done:
 - Means to register the core plugin translations. They are currently added
in the fixtures directory as static files. Need to be generated on the fly.

fixtures/translations/en-US.json

@@ -0,0 +1,4 @@
+{
+  "CORE-WELCOME_MESSAGE": "is loading. Give me a moment here. I'm loading a whole bunch of code. Don't worry, all this good stuff will be cached up for next time!",
+  "CORE-WELCOME_ERROR": "Kibana did not load properly. Check the server output for more information."
+}

fixtures/translations/en.json

@@ -0,0 +1,4 @@
+{
+  "CORE-WELCOME_MESSAGE": "is loading. Give me a moment here. I'm loading a whole bunch of code. Don't worry, all this good stuff will be cached up for next time!",
+  "CORE-WELCOME_ERROR": "Kibana did not load properly. Check the server output for more information."
+}

package.json

@@ -81,6 +81,7 @@
     "@spalger/test-subj-selector": "0.2.1",
     "@spalger/ui-ace": "0.2.3",
     "JSONStream": "1.1.1",
+    "accept-language-parser": "1.1.2",
     "angular": "1.4.7",
     "angular-bootstrap-colorpicker": "3.0.19",
     "angular-elastic": "2.5.0",
@@ -185,6 +186,7 @@
     "event-stream": "3.3.2",
     "expect.js": "0.3.1",
     "faker": "1.1.0",
+    "fs-extra": "0.30.0",
     "grunt": "1.0.1",
     "grunt-aws-s3": "0.14.5",
     "grunt-babel": "5.0.1",

src/plugins/i18n/server/__tests__/i18n.js

@@ -1,4 +1,5 @@
 import expect from 'expect.js';
+import fse from 'fs-extra';
 import i18n from '../i18n/i18n';
 import path from 'path';
 import process from 'child_process';
@@ -6,11 +7,18 @@ import Promise from 'bluebird';
 
 const PATH_SEPARATOR = path.sep;
 const DATA_PATH = __dirname + PATH_SEPARATOR + 'fixtures';
+const TRANSLATION_BACKUP_PATH = DATA_PATH + '/translations_backup';
+
+const translationStorePath = i18n.getTranslationStoragePath();
 
 describe('Test registering translations for test_plugin_1', function () {
   const pluginName = 'test_plugin_1';
   const pluginTranslationPath = DATA_PATH + PATH_SEPARATOR + 'translations' + PATH_SEPARATOR + pluginName;
 
+  before(function (done) {
+    backupTranslations(done);
+  });
+
   it('Register translations' , function (done) {
     let result = true;
     const translationFiles = [
@@ -54,13 +62,16 @@ describe('Test registering translations for test_plugin_1', function () {
   });
 
   after(function (done) {
-    const translationStorePath = i18n.getTranslationStoragePath();
-    process.execSync('rm -rf ' + translationStorePath);
-    done();
+    restoreTranslations(done);
   });
 });
 
 describe('Test registering translations for test_plugin_1 and test_plugin_2', function () {
+
+  before(function (done) {
+    backupTranslations(done);
+  });
+
   it('Register translations for test_plugin_1' , function (done) {
     let result = true;
     const pluginName = 'test_plugin_1';
@@ -120,9 +131,7 @@ describe('Test registering translations for test_plugin_1 and test_plugin_2', fu
   });
 
   after(function (done) {
-    const translationStorePath = i18n.getTranslationStoragePath();
-    process.execSync('rm -rf ' + translationStorePath);
-    done();
+    restoreTranslations(done);
   });
 });
 
@@ -193,3 +202,44 @@ function checkRegisteredLanguages(expectedLanguages, done) {
     done();
   });
 }
+
+function backupTranslations(done) {
+  const translationStorePath = i18n.getTranslationStoragePath();
+  fse.copy(translationStorePath, TRANSLATION_BACKUP_PATH, function (err) {
+    if (err) {
+      console.error(err);
+      done();
+      return;
+    }
+    fse.emptyDir(translationStorePath, function (err) {
+      if (err) {
+        console.error(err);
+      }
+      done();
+    });
+  });
+}
+
+function restoreTranslations(done) {
+  const translationStorePath = i18n.getTranslationStoragePath();
+  fse.emptyDir(translationStorePath, function (err) {
+    if (err) {
+      console.error(err);
+      done();
+      return;
+    }
+    fse.copy(TRANSLATION_BACKUP_PATH, translationStorePath, function (err) {
+      if (err) {
+        console.error(err);
+        done();
+        return;
+      }
+      fse.remove(TRANSLATION_BACKUP_PATH, function (err) {
+        if (err) {
+          console.error(err);
+        }
+        done();
+      });
+    });
+  });
+}

src/plugins/i18n/server/i18n/index.js

@@ -1,4 +1,4 @@
-import { i18n } from './i18n';
+import  i18n from './i18n';
 
 /*
  Manages the language translations for Kibana. Responsible for loading translated content per language.

src/ui/index.js

@@ -10,6 +10,13 @@ import UiExports from './ui_exports';
 import UiBundle from './ui_bundle';
 import UiBundleCollection from './ui_bundle_collection';
 import UiBundlerEnv from './ui_bundler_env';
+import i18nPlugin from '../plugins/i18n/server/i18n/index';
+import langParser from 'accept-language-parser';
+
+let kibanaTranslations = [];
+let acceptLanguages = '';
+
+const DEFAULT_LANGUAGE = 'en';
 
 export default async (kbnServer, server, config) => {
   const uiExports = kbnServer.uiExports = new UiExports({
@@ -50,6 +57,9 @@ export default async (kbnServer, server, config) => {
       const app = uiExports.apps.byId[id];
       if (!app) return reply(Boom.notFound('Unknown app ' + id));
 
+      const acceptLanguageStr = req.headers['accept-language'];
+      acceptLanguages = langParser.parse(acceptLanguageStr);
+
       try {
         if (kbnServer.status.isGreen()) {
           await reply.renderApp(app);
@@ -88,6 +98,10 @@ export default async (kbnServer, server, config) => {
 
   async function renderApp({ app, reply, includeUserProvidedConfig = true }) {
     try {
+      if (kibanaTranslations.length <= 0) {
+        const language = await getTranslationLanguage(acceptLanguages);
+        kibanaTranslations = await i18nPlugin.getRegisteredLanguageTranslations(language);
+      }
       return reply.view(app.templateName, {
         app,
         kibanaPayload: await getKibanaPayload({
@@ -96,6 +110,8 @@ export default async (kbnServer, server, config) => {
           includeUserProvidedConfig
         }),
         bundlePath: `${config.get('server.basePath')}/bundles`,
+        welcomeMessage: translate('CORE-WELCOME_MESSAGE'),
+        welcomeError: translate('CORE-WELCOME_ERROR'),
       });
     } catch (err) {
       reply(err);
@@ -118,3 +134,55 @@ export default async (kbnServer, server, config) => {
     });
   });
 };
+
+function translate(key) {
+  if (!(key in kibanaTranslations)) {
+    return null;
+  }
+  return kibanaTranslations[key];
+}
+
+async function getTranslationLanguage(acceptLanguages) {
+  let langStr = '';
+  let foundLang = false;
+  const acceptLangsLen = acceptLanguages.length;
+  const registeredLanguages = await i18nPlugin.getRegisteredTranslationLanguages();
+
+  for (let indx = 0; indx < acceptLangsLen; indx++) {
+    const language = acceptLanguages[indx];
+    if (language.region) {
+      langStr = language.code + '-' + language.region;
+    } else {
+      langStr = language.code;
+    }
+    if (registeredLanguages.indexOf(langStr) > -1) {
+      foundLang = true;
+      break;
+    }
+  }
+  if (foundLang) {
+    return langStr;
+  }
+
+  const regLangsLen = registeredLanguages.length;
+  for (let indx = 0; indx < acceptLangsLen; indx++) {
+    const language = acceptLanguages[indx];
+    langStr = language.code;
+    for (let regIndx = 0; regIndx < regLangsLen; regIndx++) {
+      const lang = registeredLanguages[regIndx];
+      if (lang.match('^' + langStr)) {
+        langStr = lang;
+        foundLang = true;
+        break;
+      }
+    }
+    if (foundLang) {
+      break;
+    }
+  }
+  if (foundLang) {
+    return langStr;
+  }
+
+  return DEFAULT_LANGUAGE;
+}

src/ui/views/ui_app.jade

@@ -125,7 +125,7 @@ block content
           err.style['text-align'] = 'center';
           err.style['background'] = '#F44336';
           err.style['padding'] = '25px';
-          err.innerText = 'Kibana did not load properly. Check the server output for more information.';
+          err.innerText = '#{welcomeError}';
 
           document.body.innerHTML = err.outerHTML;
         }