Can invite a user to join a group

src/controllers/GroupsController.ts

@@ -289,6 +289,25 @@ export class GroupsController {
 		h.send(members.map((m) => this.GroupMemberToAPI(m)));
 	}
 
+	/**
+	 * Invite a user to join the network
+	 * 
+	 * @param h Request handler
+	 */
+	public static async InviteUser(h: RequestHandler) {
+		const groupID = await h.postGroupIDWithAccess("group_id", GroupsAccessLevel.MODERATOR_ACCESS);
+		const userID = await h.postUserId("userID");
+
+		if(!await GroupsHelper.GetMembershipLevel(groupID, userID))
+			h.error(401, "The user is not a visitor of the group!");
+		
+		await GroupsHelper.SendInvitation(groupID, userID);
+
+		// TODO : Create a notification
+
+		h.success("The user has been successfully invited to join the group!");
+	}
+
 	/**
 	 * Turn a GroupInfo object into a valid API object
 	 * 

src/controllers/Routes.ts

@@ -106,4 +106,6 @@ export const Routes : Route[] = [
 	{path: "/groups/delete_logo", cb: (h) => GroupsController.DeleteLogo(h)},
 
 	{path: "/groups/get_members", cb: (h) => GroupsController.GetMembers(h)},
+
+	{path: "/groups/invite", cb: (h) => GroupsController.InviteUser(h)},
 ]

src/helpers/GroupsHelper.ts

@@ -158,6 +158,23 @@ export class GroupsHelper {
 		return result.visibility;
 	}
 
+	/**
+	 * Invite a user to join a group
+	 * 
+	 * @param groupID The ID of the target group
+	 * @param userID The ID of the target user
+	 */
+	public static async SendInvitation(groupID: number, userID: number) {
+		await this.InsertMember(new GroupMember({
+			id: -1,
+			userID: userID,
+			groupID: groupID,
+			timeCreate: time(),
+			following: true,
+			level: GroupMembershipLevels.INVITED
+		}));
+	}
+
 	/**
 	 * Insert a new group member
 	 *