Can delete group members

src/controllers/groups_controller.rs

@@ -245,5 +245,27 @@ pub fn cancel_request(r: &mut HttpRequestHandler) -> RequestResult {
 
 /// Remove a member from a group (as a moderator or an admin)
 pub fn delete_member(r: &mut HttpRequestHandler) -> RequestResult {
-    r.success("Implement me")
+    let group_id = r.post_group_id_with_access("groupID", GroupAccessLevel::MODERATOR_ACCESS)?;
+
+    // Get the membership of the user making the request
+    let curr_user_membership = groups_helper::get_membership(&group_id, r.user_id_opt())?;
+
+    // Get information about the member to delete
+    let user_id = r.post_user_id("userID")?;
+    let membership = groups_helper::get_membership(&group_id, Some(user_id.clone()))?;
+
+    if user_id == r.user_id()? && groups_helper::is_last_admin(&group_id, &r.user_id()?)? {
+        r.forbidden("You are the last administrator of this group!".to_string())?;
+    }
+
+    // Only administrator can delete members that are more than members (moderators & administrators)
+    if membership.level < GroupMembershipLevel::MEMBER && curr_user_membership.level != GroupMembershipLevel::ADMINISTRATOR {
+        r.forbidden("Only administrators can delete this membership!".to_string())?;
+    }
+
+    groups_helper::delete_member(&group_id, &user_id)?;
+
+    // TODO : Delete related notifications
+
+    r.success("Membership of the user has been successfully deleted!")
 }

src/data/group_member.rs

@@ -2,17 +2,21 @@
 //!
 //! @author Pierre Hubert
 
-use crate::data::user::UserID;
 use crate::data::group_id::GroupID;
+use crate::data::user::UserID;
 
-#[derive(PartialEq, Eq)]
+#[derive(PartialEq, Eq, PartialOrd)]
 pub enum GroupMembershipLevel {
     ADMINISTRATOR = 0,
     MODERATOR = 1,
     MEMBER = 2,
     INVITED = 3,
-    PENDING = 4, //When the group membership has not been approved yet
-    VISITOR = 5, //Simple visit
+
+    // When the group membership has not been approved yet
+    PENDING = 4,
+
+    // Simple visit
+    VISITOR = 5,
 }
 
 impl GroupMembershipLevel {
@@ -34,5 +38,19 @@ pub struct GroupMember {
     pub group_id: GroupID,
     pub time_create: u64,
     pub level: GroupMembershipLevel,
-    pub following: bool
+    pub following: bool,
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::data::group_member::GroupMembershipLevel;
+
+    #[test]
+    fn membership_level_coherence() {
+        assert!(GroupMembershipLevel::ADMINISTRATOR < GroupMembershipLevel::MODERATOR);
+        assert!(GroupMembershipLevel::MODERATOR < GroupMembershipLevel::MEMBER);
+        assert!(GroupMembershipLevel::MEMBER < GroupMembershipLevel::INVITED);
+        assert!(GroupMembershipLevel::INVITED < GroupMembershipLevel::PENDING);
+        assert!(GroupMembershipLevel::PENDING < GroupMembershipLevel::VISITOR);
+    }
 }

src/helpers/groups_helper.rs

@@ -297,6 +297,20 @@ pub fn count_members(group_id: &GroupID) -> ResultBoxError<usize> {
         .exec_count()
 }
 
+/// Count the number of group's members at a specific level
+pub fn count_members_at_level(group_id: &GroupID, level: GroupMembershipLevel) -> ResultBoxError<usize> {
+    database::QueryInfo::new(GROUPS_MEMBERS_TABLE)
+        .cond_group_id("groups_id", group_id)
+        .cond_u32("level", level.to_db())
+        .exec_count()
+}
+
+/// Check out whether a user is the last administrator of a group
+pub fn is_last_admin(group_id: &GroupID, user_id: &UserID) -> ResultBoxError<bool> {
+    Ok(get_membership_level(group_id, Some(user_id.clone()))? == GroupMembershipLevel::ADMINISTRATOR &&
+        count_members_at_level(&group_id, GroupMembershipLevel::ADMINISTRATOR)? == 1)
+}
+
 /// Check the availability of a virtual directory for a group
 pub fn check_directory_availability(dir: &str, group_id: Option<GroupID>) -> ResultBoxError<bool> {
     let group = find_by_virtual_directory(dir);