save language prefs

mac/Focalboard/ViewController.swift

@@ -7,10 +7,13 @@ import WebKit
 class ViewController:
 	NSViewController,
 	WKUIDelegate,
+    WKScriptMessageHandler,
 	WKNavigationDelegate {
 	@IBOutlet var webView: WKWebView!
 	private var refreshWebViewOnLoad = true
 
+    let messageHandler = "Desktop"
+
 	override func viewDidLoad() {
 		super.viewDidLoad()
 
@@ -78,12 +81,19 @@ class ViewController:
 		)
 		webView.configuration.userContentController.removeAllUserScripts()
 		webView.configuration.userContentController.addUserScript(script)
+        webView.configuration.userContentController.add(self, name: messageHandler)
 	}
 
 	private func loadHomepage() {
+        let lang = UserDefaults.standard.string(forKey: "Language")
+        var queryLang = ""
+        if lang != nil {
+            queryLang = "?lang=\(lang!)"
+        }
+
 		let appDelegate = NSApplication.shared.delegate as! AppDelegate
 		let port = appDelegate.serverPort
-		let url = URL(string: "http://localhost:\(port)/")!
+		let url = URL(string: "http://localhost:\(port)/\(queryLang)")!
 		let request = URLRequest(url: url)
 		refreshWebViewOnLoad = true
 		webView.load(request)
@@ -190,6 +200,41 @@ class ViewController:
 			})
 		}
 	}
+
+    func getJsonFromString(stringMessage: String) -> Dictionary<String, Any> {
+        let data: Data = stringMessage.data(using: .utf8)!
+        do {
+            let json = try JSONSerialization.jsonObject(with: data) as? [String: Any]
+            return json!
+        } catch _ {
+            NSLog("could not deserialize json")
+            return [String: Any]()
+        }
+    }
+
+    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
+        if message.name == messageHandler {
+            guard let params = message.body as? [String: Any],
+                  let messageType = params["type"] as? String,
+                  let stringArgs = params["args"] as? String else {
+                NSLog("Received a message but it was not in the expected format")
+                return
+            }
+
+            let messageArgs = getJsonFromString(stringMessage: stringArgs)
+            switch messageType {
+            case "setLanguage":
+                guard let lang = messageArgs["lang"] as? String else {
+                    NSLog("Invalid set language parameters")
+                    return
+                }
+                NSLog("Saving current language %@", lang)
+                UserDefaults.standard.set(lang, forKey: "Language")
+            default:
+                NSLog("Unknown message type %@", messageType)
+            }
+        }
+    }
 
 	// HACKHACK: Fix WebView initial rendering artifacts
 	private func refreshWebView() {
@@ -215,6 +260,7 @@ class ViewController:
 		}
 		return nil
 	}
+
 
 	@IBAction func navigateToHome(_ sender: NSObject) {
 		loadHomepage()

webapp/src/app.tsx

@@ -21,7 +21,8 @@ import {Utils} from './utils'
 import CombinedProviders from './combinedProviders'
 
 const App = React.memo((): JSX.Element => {
-    const [language, setLanguage] = useState(getCurrentLanguage())
+    const params = (new URL(window.location.toString())).searchParams
+    const [language, setLanguage] = useState(getCurrentLanguage(params.get('lang')))
     const [user, setUser] = useState<IUser|undefined>(undefined)
     const [initialLoad, setInitialLoad] = useState(false)
 

webapp/src/i18n.tsx

@@ -36,14 +36,20 @@ export function getMessages(lang: string): {[key: string]: string} {
     return messages_en
 }
 
-export function getCurrentLanguage(): string {
-    let lang = localStorage.getItem('language')
+export function getCurrentLanguage(initialLang: string|null): string {
+    let lang = initialLang
+    if (!lang) {
+        lang = localStorage.getItem('language')
+    }
     if (!lang) {
         lang = navigator.language.split(/[-_]/)[0]
     }
     return lang
 }
 
 export function storeLanguage(lang: string): void {
+    // webkit is only available on wkwebviews
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    (window as any).webkit?.messageHandlers?.Desktop?.postMessage({type: 'setLanguage', args: JSON.stringify({lang})})
     localStorage.setItem('language', lang)
 }