add restentpoint for login/logout, restructuring of modules and components, add flow usage

scm-webapp/src/main/java/sonia/scm/security/SecurityRequests.java

@@ -0,0 +1,24 @@
+package sonia.scm.security;
+
+import javax.servlet.http.HttpServletRequest;
+import java.util.regex.Pattern;
+
+/**
+ * Created by masuewer on 04.07.18.
+ */
+public final class SecurityRequests {
+
+  private static final Pattern URI_LOGIN_PATTERN = Pattern.compile("/api/rest(?:/v2)?/auth/access_token");
+
+  private SecurityRequests() {}
+
+  public static boolean isAuthenticationRequest(HttpServletRequest request) {
+    String uri = request.getRequestURI().substring(request.getContextPath().length());
+    return isAuthenticationRequest(uri);
+  }
+
+  public static boolean isAuthenticationRequest(String uri) {
+    return URI_LOGIN_PATTERN.matcher(uri).matches();
+  }
+
+}