Can change group membership

src/controllers/groups_controller.rs

@@ -272,5 +272,26 @@ pub fn delete_member(r: &mut HttpRequestHandler) -> RequestResult {
 
 /// Update a user's membership
 pub fn update_membership(r: &mut HttpRequestHandler) -> RequestResult {
-    r.success("ready to implement")
+    let group_id = r.post_group_id_with_access("groupID", GroupAccessLevel::ADMIN_ACCESS)?;
+    let user_id = r.post_user_id("userID")?;
+
+    if user_id == r.user_id()? {
+        r.bad_request("You can not update your own membership!".to_string())?;
+    }
+
+    let level = groups_helper::get_membership_level(&group_id, Some(user_id.clone()))?;
+
+    if level > GroupMembershipLevel::MEMBER {
+        r.forbidden("This user is not a member of the group!".to_string())?;
+    }
+
+    let new_level = GroupMembershipLevel::from_api(&r.post_string("level")?);
+
+    if new_level > GroupMembershipLevel::MEMBER {
+        r.forbidden("You can not assign this visibility level!".to_string())?;
+    }
+
+    groups_helper::update_membership_level(&group_id, &user_id, new_level)?;
+
+    r.success("User membership has been successfully updated!")
 }