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src/main/java/stirling/software/SPDF/config/security/UserAuthenticationFilter.java

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+package stirling.software.SPDF.config.security;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import io.github.bucket4j.Bandwidth;
+import io.github.bucket4j.Bucket;
+import io.github.bucket4j.Bucket4j;
+import io.github.bucket4j.ConsumptionProbe;
+import io.github.bucket4j.Refill;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import stirling.software.SPDF.model.ApiKeyAuthenticationToken;
+@Component
+public class UserAuthenticationFilter extends OncePerRequestFilter {
+
+    @Autowired
+    private UserDetailsService userDetailsService;
+
+    @Autowired
+    @Lazy
+    private UserService userService;
+    
+   
+    @Autowired
+    @Qualifier("loginEnabled")
+    public boolean loginEnabledValue;
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request,
+                                    HttpServletResponse response,
+                                    FilterChain filterChain) throws ServletException, IOException {
+
+        if (!loginEnabledValue) {
+            // If login is not enabled, just pass all requests without authentication
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+
+        // Check for API key in the request headers if no authentication exists
+        if (authentication == null || !authentication.isAuthenticated()) {
+            String apiKey = request.getHeader("X-API-Key");
+            if (apiKey != null && !apiKey.trim().isEmpty()) {
+                try {
+                    // Use API key to authenticate. This requires you to have an authentication provider for API keys.
+                	UserDetails userDetails = userService.loadUserByApiKey(apiKey);
+                	if(userDetails == null)
+                	{
+                		response.setStatus(HttpStatus.UNAUTHORIZED.value());
+                        response.getWriter().write("Invalid API Key.");
+                        return;
+                	}
+                    authentication = new ApiKeyAuthenticationToken(userDetails, apiKey, userDetails.getAuthorities());
+                    SecurityContextHolder.getContext().setAuthentication(authentication);
+                } catch (AuthenticationException e) {
+                    // If API key authentication fails, deny the request
+                    response.setStatus(HttpStatus.UNAUTHORIZED.value());
+                    response.getWriter().write("Invalid API Key.");
+                    return;
+                }
+            }
+        }
+
+        // If we still don't have any authentication, deny the request
+        if (authentication == null || !authentication.isAuthenticated()) {
+        	String method = request.getMethod();
+        	if ("GET".equalsIgnoreCase(method)) {
+        		 response.sendRedirect("/login");  // redirect to the login page
+        	     return;
+            }
+            response.setStatus(HttpStatus.UNAUTHORIZED.value());
+            response.getWriter().write("Authentication required. Please provide a X-API-KEY in request header.\nThis is found in Settings -> Account Settings -> API Key\nAlternativly you can disable authentication if this is unexpected");
+            return;
+        }
+
+        filterChain.doFilter(request, response);
+    }
+    
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) throws ServletException {
+        String uri = request.getRequestURI();
+
+        String[] permitAllPatterns = {
+            "/login",
+            "/register",
+            "/error",
+            "/images/",
+            "/public/",
+            "/css/",
+            "/js/"
+        };
+
+        for (String pattern : permitAllPatterns) {
+            if (uri.startsWith(pattern) || uri.endsWith(".svg")) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+}