XYZ-37: Advanced Permissions Phase 1 Backend. (#8159)

* XYZ-13: Update Permission and Role structs to new design.

* XYZ-10: Role store.

* XYZ-9/XYZ-44: Roles API endpoints and WebSocket message.

* XYZ-8: Switch server permissions checks to store backed roles.

* XYZ-58: Proper validation of roles where required.

* XYZ-11/XYZ-55: Migration to store backed roles from policy config.

* XYZ-37: Update unit tests to work with database roles.

* XYZ-56: Remove the "guest" role.

* Changes to SetDefaultRolesFromConfig.

* Short-circuit the store if nothing has changed.

* Address first round of review comments.

* Address second round of review comments.

api4/context.go

@@ -641,3 +641,26 @@ func (c *Context) RequireActionId() *Context {
 	}
 	return c
 }
+
+func (c *Context) RequireRoleId() *Context {
+	if c.Err != nil {
+		return c
+	}
+
+	if len(c.Params.RoleId) != 26 {
+		c.SetInvalidUrlParam("role_id")
+	}
+	return c
+}
+
+func (c *Context) RequireRoleName() *Context {
+	if c.Err != nil {
+		return c
+	}
+
+	if !model.IsValidRoleName(c.Params.RoleName) {
+		c.SetInvalidUrlParam("role_name")
+	}
+
+	return c
+}