Switched from the manual implemented authentication-layer to Spring Security

[examples/facebook-app] / src / main / java / de / juplo / yourshouter / SpringSecurityContextUserIdSource.java

diff --git a/src/main/java/de/juplo/yourshouter/SpringSecurityContextUserIdSource.java b/src/main/java/de/juplo/yourshouter/SpringSecurityContextUserIdSource.java
new file mode 100644 (file)
index 0000000..d774060
--- /dev/null
+++ b/src/main/java/de/juplo/yourshouter/SpringSecurityContextUserIdSource.java
@@ -0,0 +1,33 @@
+package de.juplo.yourshouter;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContext;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.social.UserIdSource;
+import org.springframework.util.Assert;
+
+
+/**
+ * Implementation of {@link UserIdSource}, that retrieves the ID of the current
+ * user from the {@link SecurityContext}.
+ *
+ * @author Kai Moritz
+ */
+public class SpringSecurityContextUserIdSource implements UserIdSource
+{
+  /**
+   * Retrieves the ID of the current user from the {@link SecurityContext}.
+   * If no ID is found, an exception is thrown.
+   *
+   * @return The ID of the current user
+   * @throws IllegalStateException, if no current user is found.
+   */
+  @Override
+  public String getUserId()
+  {
+    SecurityContext context = SecurityContextHolder.getContext();
+    Authentication authentication = context.getAuthentication();
+    Assert.state(authentication != null, "No user signed in!");
+    return authentication.getName();
+  }
+}