From 63f20bc3979c61f71afcad1e9c7bbcdbe783a98e Mon Sep 17 00:00:00 2001
From: Ildar Kamalov <i.kamalov@adguard.com>
Date: Thu, 22 Nov 2018 17:56:57 +0300
Subject: [PATCH] Request language from server

---
 client/src/actions/index.js        | 30 ++++++++++++++++++++++++++++++
 client/src/api/Api.js              | 18 ++++++++++++++++++
 client/src/components/App/index.js | 24 ++++++++++++++++++++++++
 client/src/reducers/index.js       |  7 +++++++
 i18n.go                            |  3 ++-
 5 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/client/src/actions/index.js b/client/src/actions/index.js
index 4f55f23c..a4da8c9a 100644
--- a/client/src/actions/index.js
+++ b/client/src/actions/index.js
@@ -492,3 +492,33 @@ export const testUpstream = servers => async (dispatch) => {
         dispatch(testUpstreamFailure());
     }
 };
+
+export const changeLanguageRequest = createAction('CHANGE_LANGUAGE_REQUEST');
+export const changeLanguageFailure = createAction('CHANGE_LANGUAGE_FAILURE');
+export const changeLanguageSuccess = createAction('CHANGE_LANGUAGE_SUCCESS');
+
+export const changeLanguage = lang => async (dispatch) => {
+    dispatch(changeLanguageRequest());
+    try {
+        await apiClient.changeLanguage(lang);
+        dispatch(changeLanguageSuccess());
+    } catch (error) {
+        dispatch(addErrorToast({ error }));
+        dispatch(changeLanguageFailure());
+    }
+};
+
+export const getLanguageRequest = createAction('GET_LANGUAGE_REQUEST');
+export const getLanguageFailure = createAction('GET_LANGUAGE_FAILURE');
+export const getLanguageSuccess = createAction('GET_LANGUAGE_SUCCESS');
+
+export const getLanguage = () => async (dispatch) => {
+    dispatch(getLanguageRequest());
+    try {
+        const language = await apiClient.getCurrentLanguage();
+        dispatch(getLanguageSuccess(language));
+    } catch (error) {
+        dispatch(addErrorToast({ error }));
+        dispatch(getLanguageFailure());
+    }
+};
diff --git a/client/src/api/Api.js b/client/src/api/Api.js
index 0e9a1c74..f0d90941 100644
--- a/client/src/api/Api.js
+++ b/client/src/api/Api.js
@@ -284,4 +284,22 @@ export default class Api {
         const { path, method } = this.SAFESEARCH_DISABLE;
         return this.makeRequest(path, method);
     }
+
+    // Language
+    CURRENT_LANGUAGE = { path: 'i18n/current_language', method: 'GET' };
+    CHANGE_LANGUAGE = { path: 'i18n/change_language', method: 'POST' };
+
+    getCurrentLanguage() {
+        const { path, method } = this.CURRENT_LANGUAGE;
+        return this.makeRequest(path, method);
+    }
+
+    changeLanguage(lang) {
+        const { path, method } = this.CHANGE_LANGUAGE;
+        const parameters = {
+            data: lang,
+            headers: { 'Content-Type': 'text/plain' },
+        };
+        return this.makeRequest(path, method, parameters);
+    }
 }
diff --git a/client/src/components/App/index.js b/client/src/components/App/index.js
index b4b040a9..98c37afa 100644
--- a/client/src/components/App/index.js
+++ b/client/src/components/App/index.js
@@ -17,6 +17,7 @@ import Footer from '../ui/Footer';
 import Toasts from '../Toasts';
 import Status from '../ui/Status';
 import Update from '../ui/Update';
+import i18n from '../../i18n';
 
 class App extends Component {
     componentDidMount() {
@@ -24,10 +25,32 @@ class App extends Component {
         this.props.getVersion();
     }
 
+    componentDidUpdate(prevProps) {
+        if (this.props.dashboard.language !== prevProps.dashboard.language) {
+            this.setLanguage();
+        }
+    }
+
     handleStatusChange = () => {
         this.props.enableDns();
     };
 
+    setLanguage = () => {
+        const { processing, language } = this.props.dashboard;
+
+        if (!processing) {
+            if (!language) {
+                this.props.changeLanguage(i18n.language);
+            } else {
+                i18n.changeLanguage(language);
+            }
+        }
+
+        i18n.on('languageChanged', (lang) => {
+            this.props.changeLanguage(lang);
+        });
+    }
+
     render() {
         const { dashboard } = this.props;
         const updateAvailable =
@@ -78,6 +101,7 @@ App.propTypes = {
     isCoreRunning: PropTypes.bool,
     error: PropTypes.string,
     getVersion: PropTypes.func,
+    changeLanguage: PropTypes.func,
 };
 
 export default App;
diff --git a/client/src/reducers/index.js b/client/src/reducers/index.js
index 2e32be98..9a54f249 100644
--- a/client/src/reducers/index.js
+++ b/client/src/reducers/index.js
@@ -49,6 +49,7 @@ const dashboard = handleActions({
             querylog_enabled: queryLogEnabled,
             upstream_dns: upstreamDns,
             protection_enabled: protectionEnabled,
+            language,
         } = payload;
         const newState = {
             ...state,
@@ -60,6 +61,7 @@ const dashboard = handleActions({
             queryLogEnabled,
             upstreamDns: upstreamDns.join('\n'),
             protectionEnabled,
+            language,
         };
         return newState;
     },
@@ -145,6 +147,11 @@ const dashboard = handleActions({
         const { upstreamDns } = payload;
         return { ...state, upstreamDns };
     },
+
+    [actions.getLanguageSuccess]: (state, { payload }) => {
+        const newState = { ...state, language: payload };
+        return newState;
+    },
 }, {
     processing: true,
     isCoreRunning: false,
diff --git a/i18n.go b/i18n.go
index 54c11018..7f0652e1 100644
--- a/i18n.go
+++ b/i18n.go
@@ -27,7 +27,8 @@ func isLanguageAllowed(language string) bool {
 
 func handleI18nCurrentLanguage(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "text/plain")
-	_, err := fmt.Fprintf(w, config.Language)
+	log.Printf("config.Language is %s", config.Language)
+	_, err := fmt.Fprintf(w, "%s\n", config.Language)
 	if err != nil {
 		errortext := fmt.Sprintf("Unable to write response json: %s", err)
 		log.Println(errortext)