preparing svelte login, mastered translations

backend/build.gradle.kts

@@ -13,8 +13,8 @@ application{
 
 dependencies{
     implementation(project(":translations"))
+    implementation(project(":user"))
     implementation(project(":web"))
-    implementation("de.srsoftware:tools.http:6.0.0")
 }
 
 tasks.jar {

backend/src/main/java/de/srsoftware/umbrella/backend/Application.java

@@ -7,6 +7,7 @@ import static java.lang.System.Logger.Level.INFO;
 import com.sun.net.httpserver.HttpServer;
 import de.srsoftware.tools.ColorLogger;
 import de.srsoftware.umbrella.translations.Translations;
+import de.srsoftware.umbrella.user.UserModule;
 import de.srsoftware.umbrella.web.WebHandler;
 import java.io.IOException;
 import java.net.InetSocketAddress;
@@ -22,6 +23,7 @@ public class Application {
 		HttpServer server      = HttpServer.create(new InetSocketAddress(port), 0);
 		server.setExecutor(Executors.newFixedThreadPool(threads));
 		new WebHandler().bindPath("/").on(server);
+		new UserModule().bindPath("/api/user").on(server);
 		new Translations().bindPath("/api/translations").on(server);
 		LOG.log(INFO,"Started web server at {0}",port);
 		server.start();

build.gradle.kts

@@ -40,7 +40,7 @@ subprojects {
     dependencies {
         testImplementation(platform("org.junit:junit-bom:5.10.0"))
         testImplementation("org.junit.jupiter:junit-jupiter")
-
+        implementation("de.srsoftware:tools.http:6.0.2")
         implementation("de.srsoftware:tools.logging:1.3.2")
     }
 

frontend/src/App.svelte

@@ -1,6 +1,8 @@
 <script>
     import { onMount } from 'svelte';
-    import { loadTranslation } from './translations.svelte.js'
+    import { loadTranslation } from './translations.svelte.js';
+    import { user } from './user.svelte.js';
+
     let translations_ready = false;
     onMount(async () => {
         await loadTranslation('de','Login');
@@ -12,10 +14,13 @@
     import Menu     from "./Components/Menu.svelte";
 </script>
 
-{#if translations_ready}
+{#if translations_ready }
+{#if user.username }
 <Menu />
 <Homepage />
+{:else}
 <Login />
+{/if}
 {:else}
     <p>Loading translations...</p>
 {/if}

frontend/src/Components/Homepage.svelte

@@ -1 +1,5 @@
-<h1>Welcome</h1>
+<script>
+    import { t } from '../translations.svelte.js';
+    import { user } from '../user.svelte.js';
+</script>
+<h1>{t('home.Welcome')}, {user.username}</h1>

frontend/src/Components/Login.svelte

@@ -1,5 +1,15 @@
 <script>
     import { t } from '../translations.svelte.js';
+    import { tryLogin } from '../user.svelte.js';
+    let credentials = { username : null, password : null }
+
+    function doLogin(ev){
+        tryLogin(credentials);
+    }
+
+    function init(element){
+        element.focus();
+    }
 </script>
 <style>
     label { display: block; margin: 5px; }
@@ -14,21 +24,22 @@
     }
 </style>
 
-<fieldset>
+<form on:submit|preventDefault={doLogin}>
+    <fieldset>
         <legend>{t('login.Login')}</legend>
         <label>
-        <input type="text" />
-        <span>Email/Username</span>
+            <input type="text" bind:value={credentials.username} required use:init />
+            <span>{t('login.Email_or_Username')}</span>
         </label>
         <label>
-        <input type="password" />
-        <span>Password</span>
+            <input type="password" bind:value={credentials.password} required />
+            <span>{t('login.Password')}</span>
         </label>
-    <button>Login</button>
-</fieldset>
-
+        <button>{t('login.do_login')}</button>
+    </fieldset>
+</form>
 <fieldset>
-    <legend>OIDC Login</legend>
+    <legend>{t('login.OIDC_Login')}</legend>
     <button>SRSoftware</button>
     <button>ORC ID</button>
 </fieldset>

frontend/src/Components/Menu.svelte

@@ -1,3 +1,13 @@
+<script>
+    import { t } from '../translations.svelte.js';
+    import { user } from '../user.svelte.js';
+
+    function logout(){
+        user.username = null;
+    }
+</script>
 <nav>
-    <a href="/">Home</a>
+    <a href="/">{t('nav.Home')}</a>
+    <a href="https://svelte.dev/tutorial/svelte/state" target="_blank">{t('nav.Tutorial')}</a>
+    <a href="#" on:click={logout}>Logout</a>
 </nav>

frontend/src/app.css

@@ -1,3 +1,6 @@
+a {
+    color: orange;
+}
 body {
     background: black;
     color: orange;
@@ -14,6 +17,7 @@ input{
     border-radius: 4px;
     padding: 3px;
     margin: 3px;
+    color: orange;
 }
 
 button{

frontend/src/translations.svelte.js

@@ -8,12 +8,11 @@ export async function loadTranslation(lang){
 }
 
 export function t(key){
-    var keys = key.split('.');
     let set = translations.values;
+    var keys = key.split('.');
     for (let key of keys){
-        if (set[key]) {
+        if (!set[key]) return keys[keys.length-1];
         set = set[key];
-        } else return key;
     }
     return set;
 }

frontend/src/user.svelte.js

@@ -0,0 +1,20 @@
+export const user = $state({
+    name : null
+})
+
+export async function tryLogin(credentials){
+    var url = `${location.protocol}//${location.host.replace('5173','8080')}/api/user/login`;
+    let response = await fetch(url,{
+        headers: {
+            'Content-Type':'application/json'
+        },
+        method: 'POST',
+        body: JSON.stringify(credentials)
+    });
+    if (response.ok){
+        const json = await response.json();
+        for (var key of Object.keys(json)) user[key] = json[key];
+    } else {
+        alert("Login failed!");
+    }
+}

settings.gradle.kts

@@ -1,5 +1,6 @@
 rootProject.name = "Umbrella25"
 
 include("backend")
-include("web")
 include("translations")
+include("user")
+include("web")

translations/build.gradle.kts

@@ -1,6 +1,5 @@
 description = "Umbrella : Translations"
 
 dependencies{
-    implementation("de.srsoftware:tools.http:6.0.0")
     implementation("org.json:json:20240303")
 }

translations/src/main/java/de/srsoftware/umbrella/translations/Translations.java

@@ -1,21 +1,17 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.translations;
 
-import static java.lang.System.Logger.Level.INFO;
 import static java.lang.System.Logger.Level.WARNING;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.sun.net.httpserver.HttpExchange;
 import de.srsoftware.tools.Path;
 import de.srsoftware.tools.PathHandler;
-import org.json.JSONObject;
-
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.net.URL;
-import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
-import java.util.Map;
+import org.json.JSONObject;
 
 public class Translations extends PathHandler {
 	private static final System.Logger LOG = System.getLogger("Translations");
@@ -24,7 +20,6 @@ public class Translations extends PathHandler {
 
 	@Override
 	public boolean doGet(Path path, HttpExchange ex) throws IOException {
-		LOG.log(INFO,"doGet({0},ex)",path);
 		allowOrigin(ex,"*");
 		if (path.empty())return sendContent(ex,501,"Language missing");
 		var lang = path.pop();

translations/src/main/resources/de.json

@@ -1,5 +1,12 @@
 {
-  'login' : {
-    'Login' : "Mist!"
+  "home" : {
+    "Welcome" : "Willkommen"
+  },
+  "login" : {
+    "do_login"         : "anmelden",
+    "Email_or_Username": "Email oder Nutzername",
+    "Login"            : "Anmeldung",
+    "OIDC_Login"       : "Anmeldung mit OIDC",
+    "Password"         : "Passwort"
   }
 }

user/build.gradle.kts

@@ -0,0 +1,6 @@
+description = "Umbrella : User"
+
+dependencies{
+    implementation("de.srsoftware:tools.mime:1.1.2")
+    implementation("org.json:json:20240303")
+}

user/src/main/java/de/srsoftware/umbrella/user/UserModule.java

@@ -0,0 +1,54 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.user;
+
+import com.sun.net.httpserver.HttpExchange;
+import de.srsoftware.tools.MimeType;
+import de.srsoftware.tools.Path;
+import de.srsoftware.tools.PathHandler;
+import de.srsoftware.tools.SessionToken;
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.UUID;
+
+import static de.srsoftware.tools.MimeType.MIME_JSON;
+
+
+public class UserModule extends PathHandler {
+
+	private HttpExchange addCors(HttpExchange ex){
+		var headers = ex.getResponseHeaders();
+		headers.add("Allow-Origin","*");
+		headers.add("Access-Control-Allow-Origin","*");
+		headers.add("Access-Control-Allow-Headers","Content-Type");
+		return ex;
+	}
+
+	@Override
+	public boolean doOptions(Path path, HttpExchange ex) throws IOException {
+		return sendEmptyResponse(200,addCors(ex));
+	}
+
+	@Override
+	public boolean doPost(Path path, HttpExchange ex) throws IOException {
+		addCors(ex);
+		var p = path.toString();
+		switch (p){
+			case "login": return postLogin(ex);
+		}
+		return super.doPost(path, ex);
+	}
+
+	private boolean postLogin(HttpExchange ex) throws IOException {
+		var json = json(ex);
+		if (!(json.has("username") && json.get("username") instanceof String username)) return sendContent(ex,402,"Username missing");
+		if (!(json.has("password") && json.get("password") instanceof String password)) return sendContent(ex,402,"Password missing");
+
+		if (!username.equals(password)) return sendContent(ex,401,"Login failed");
+		var sessionId = UUID.randomUUID().toString();
+		new SessionToken(sessionId).addTo(ex);
+		ex.getResponseHeaders().add("Content-Type", MIME_JSON);
+		return sendContent(ex,200,new JSONObject(Map.of("username",username)).toString());
+	}
+}

web/build.gradle.kts

@@ -1,9 +1,5 @@
 description = "Umbrella : Web"
 
-dependencies{
-    implementation("de.srsoftware:tools.http:6.0.0")
-}
-
 tasks.processResources {
     System.out.println("Copying from dist…")
     from("../frontend/dist") {