diff --git a/src/helpers/GroupsHelper.ts b/src/helpers/GroupsHelper.ts
index 797ee1a..143a9d5 100644
--- a/src/helpers/GroupsHelper.ts
+++ b/src/helpers/GroupsHelper.ts
@@ -158,6 +158,15 @@ export class GroupsHelper {
 		return result.visibility;
 	}
 
+	/**
+	 * Convenience function to check whether a group is open or not
+	 * 
+	 * @param groupID Target group ID
+	 */
+	public static async IsOpen(groupID: number) : Promise<boolean> {
+		return (await this.GetVisibility(groupID)) == GroupVisibilityLevel.OPEN_GROUP;
+	}
+
 	/**
 	 * Invite a user to join a group
 	 * 
diff --git a/src/helpers/PostsHelper.ts b/src/helpers/PostsHelper.ts
index 28db429..e52f22d 100644
--- a/src/helpers/PostsHelper.ts
+++ b/src/helpers/PostsHelper.ts
@@ -2,6 +2,8 @@ import { PostKind, PostVisibilityLevel, Post, PostPageKind, PostFile, PostLink,
 import { FriendsHelper } from "./FriendsHelper";
 import { DatabaseHelper } from "./DatabaseHelper";
 import { UserHelper } from "./UserHelper";
+import { GroupsHelper } from "./GroupsHelper";
+import { GroupMembershipLevels } from "../entities/GroupMember";
 
 /**
  * Posts helper
@@ -155,7 +157,25 @@ export class PostsHelper {
 
 		// Group page
 		else if(post.kindPage == PostPageKind.PAGE_KIND_GROUP) {
+			// TODO : check this code
+			
+			const accessLevel = await GroupsHelper.GetMembershipLevel(userID, post.groupID);
 
+			// Moderator & admin = intermediate access
+			if(accessLevel < GroupMembershipLevels.MEMBER)
+				return PostAccessLevel.INTERMEDIATE_ACCESS;
+			
+			// Members can see all the posts of a group
+			if(accessLevel == GroupMembershipLevels.MEMBER)
+				return PostAccessLevel.BASIC_ACCESS;
+			
+			// Now we check if the post is public & the group is open
+			if(post.visibilityLevel != PostVisibilityLevel.VISIBILITY_PUBLIC
+				|| !await GroupsHelper.IsOpen(post.groupID))
+				return PostAccessLevel.NO_ACCESS;
+			
+			// Public post + open group = basic access
+			return PostAccessLevel.BASIC_ACCESS;
 		}
 
 		throw Error("GetAccessLevel reached an unimplemented status!");