PMT-9: Wrap Reading of JWT from User Auth, so it can be passed later on

src/main/java/de/hmmh/pmt/auth/JwtToken.java

@@ -0,0 +1,12 @@
+package de.hmmh.pmt.auth;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.stereotype.Component;
+
+@Getter
+@Setter
+@Component
+public class JwtToken{
+    private String token;
+}

src/main/java/de/hmmh/pmt/auth/JwtTokenFilter.java

@@ -0,0 +1,38 @@
+package de.hmmh.pmt.auth;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+
+@Component
+public class JwtTokenFilter extends OncePerRequestFilter {
+
+    @Autowired
+    private JwtToken token;
+
+    @Override
+    protected void doFilterInternal(
+            HttpServletRequest request,
+            HttpServletResponse response,
+            FilterChain filterChain
+    ) throws ServletException, IOException {
+        token.setToken(null);
+        String authHeader = request.getHeader("Authorization");
+        if (authHeader == null) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+        if (!authHeader.startsWith("Bearer ")) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+        token.setToken(authHeader.substring("Bearer ".length()));
+        filterChain.doFilter(request, response);
+    }
+}