Refactor namespaced() method to web.auth.Flow base class

src/main/php/web/auth/Flow.class.php

@@ -6,6 +6,19 @@ abstract class Flow {
   const FRAGMENT= '_';
 
   private $url= null;
+  protected $namespace;
+
+  /**
+   * Sets session namespace for this flow. Used to prevent conflicts
+   * in session state with multiple OAuth flows in place.
+   *
+   * @param  string $namespace
+   * @return self
+   */
+  public function namespaced($namespace) {
+    $this->namespace= $namespace;
+    return $this;
+  }
 
   /**
    * Targets a given URL

src/main/php/web/auth/cas/CasFlow.class.php

@@ -9,7 +9,6 @@
 
 class CasFlow extends Flow {
   private $sso;
-  private $namespace= 'cas::flow';
 
   /**
    * Creates a new instance with a given SSO base url
@@ -18,18 +17,7 @@ class CasFlow extends Flow {
    */
   public function __construct($sso) {
     $this->sso= rtrim($sso, '/');
-  }
-
-  /**
-   * Sets session namespace for this flow. Used to prevent conflicts
-   * in session state with multiple OAuth flows in place.
-   *
-   * @param  string $namespace
-   * @return self
-   */
-  public function namespaced($namespace) {
-    $this->namespace= $namespace;
-    return $this;
+    $this->namespace= 'cas::flow';
   }
 
   /**

src/main/php/web/auth/oauth/OAuthFlow.class.php

@@ -4,7 +4,7 @@
 use web\auth\{Flow, UserInfo, AuthenticationError};
 
 abstract class OAuthFlow extends Flow {
-  protected $callback, $namespace;
+  protected $callback;
 
   /** @return ?util.URI */
   public function callback() { return $this->callback; }
@@ -15,18 +15,6 @@ public function calling($callback): self {
     return $this;
   }
 
-  /**
-   * Sets session namespace for this flow. Used to prevent conflicts
-   * in session state with multiple OAuth flows in place.
-   *
-   * @param  string $namespace
-   * @return self
-   */
-  public function namespaced($namespace) {
-    $this->namespace= $namespace;
-    return $this;
-  }
-
   /**
    * Returns user info which fetched from the given endpoint using the
    * authorized OAuth client