working on configuration

src/main/java/de/srsoftware/widerhall/web/Web.java

@@ -0,0 +1,138 @@
+package de.srsoftware.widerhall.web;
+
+import de.srsoftware.widerhall.Configuration;
+import de.srsoftware.widerhall.Util;
+import de.srsoftware.widerhall.data.User;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.stringtemplate.v4.STGroup;
+import org.stringtemplate.v4.STRawGroupDir;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.Map;
+
+import static de.srsoftware.widerhall.Util.t;
+
+public class Web extends HttpServlet {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Web.class);
+    private static final String LOGIN = "login";
+    private final String baseDir;
+    private final STGroup templates;
+    private static final String WEB_ROOT = "/web";
+
+    public Web(){
+        var config = Configuration.instance();
+        baseDir = config.baseDir();
+        var templateDir = String.join(File.separator,baseDir,"static","templates");
+        templates = new STRawGroupDir(templateDir,'«','»');
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        String error = handleGet(req, resp);
+        if (error != null) resp.sendError(400,error);
+    }
+
+     private String handleGet(HttpServletRequest req, HttpServletResponse resp) {
+        var path = req.getPathInfo();
+        path = path == null ? "index" : path.substring(1);
+        switch (path){
+            case "css":
+            case "js":
+            case "login":
+                return loadTemplate(path,null,resp);
+            case "jquery":
+                return loadFile("jquery-3.6.0.min.js",resp);
+        }
+
+        var u = req.getSession().getAttribute("user");
+        if (u instanceof User user){
+            Map<String,Object> data = Map.of("user",user.map());
+            return loadTemplate(path,data,resp);
+        }
+        return loginRedirect(resp);
+    }
+
+    private String loadTemplate(String path, Map<String, ? extends Object> data, HttpServletResponse resp) {
+        var template = templates.getInstanceOf(path);
+        if (template != null){
+            try {
+                template.add("data",data);
+                resp.getWriter().println(template.render());
+                return null;
+            } catch (IOException e) {
+                return t("Failed to load template '{}'",path);
+            }
+        }
+        return t("No template for path {}!",path);
+    }
+
+
+    private String loginRedirect(HttpServletResponse resp) {
+        try {
+            resp.sendRedirect(String.join("/",WEB_ROOT,LOGIN));
+            return null;
+        } catch (IOException e) {
+            return t("Was not able to redirect to login page: {}", e.getMessage());
+        }
+    }
+
+    private String loadFile(String filename, HttpServletResponse resp) {
+        var path = String.join(File.separator,baseDir,filename);
+        LOG.debug("loading {}",path);
+        var file = new File(path);
+        if (!file.exists()) return t("File {} does not exist!",filename);
+        try {
+            var content = Files.readString(file.toPath());
+            resp.getWriter().println(content);
+        } catch (IOException e) {
+            return t("Failed to load file '{}'!",filename);
+        }
+        return null;
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        String error = handlePost(req, resp);
+        if (error != null) resp.sendError(400,error);
+    }
+
+    private String handlePost(HttpServletRequest req, HttpServletResponse resp) {
+        var path = req.getPathInfo();
+        if (path == null) path = "/";
+        switch (path){
+            case "/login":
+                return handleLogin(req,resp);
+        }
+
+        return t("No handler for path {}!",path);
+    }
+
+    private String handleLogin(HttpServletRequest req, HttpServletResponse resp) {
+        var email = req.getParameter("email");
+        var pass = req.getParameter("pass");
+        if (email == null || pass == null) return loginRedirect(resp);
+        if (!Util.isEmail(email)) return loadTemplate("login", Map.of("error",t("'{}' is not a valid email address!",email)), resp);
+        try {
+            var user = User.load(email,pass);
+            req.getSession().setAttribute("user",user);
+            resp.sendRedirect(String.join("/",WEB_ROOT,"index"));
+        } catch (Exception e) {
+            try {
+                LOG.warn("Static.handleLogin failed:",e);
+                Thread.sleep(10000);
+            } finally {
+                return loadTemplate("login", Map.of("error",t("Invalid username/password")), resp);
+            }
+        }
+        return null;
+    }
+
+}