Start to determine post access level

src/helpers/PostsHelper.ts

@@ -1,6 +1,7 @@
-import { PostKind, PostVisibilityLevel, Post, PostPageKind, PostFile, PostLink } from "../entities/Post";
+import { PostKind, PostVisibilityLevel, Post, PostPageKind, PostFile, PostLink, PostAccessLevel } from "../entities/Post";
 import { FriendsHelper } from "./FriendsHelper";
 import { DatabaseHelper } from "./DatabaseHelper";
+import { UserHelper } from "./UserHelper";
 
 /**
  * Posts helper
@@ -105,6 +106,61 @@ export class PostsHelper {
 		return entries.map((r) => this.DBToPost(r));
 	}
 
+	/**
+	 * Get the access level of a user over a post
+	 * 
+	 * @param userID Target user ID
+	 * @param post Target post
+	 */
+	public static async GetAccessLevel(userID: number, post: Post) : Promise<PostAccessLevel> {
+
+		// User is the owner of the post
+		if(userID == post.userID)
+			return PostAccessLevel.FULL_ACCESS;
+		
+		
+		// User page
+		if(post.kindPage == PostPageKind.PAGE_KIND_USER) {
+
+			// Post made on user page
+			if(post.pageID == userID)
+				return PostAccessLevel.INTERMEDIATE_ACCESS;
+			
+			// Check if the post is private
+			if(post.visibilityLevel == PostVisibilityLevel.VISIBILITY_USER)
+				return PostAccessLevel.NO_ACCESS;
+			
+			// In case the post is only for friends
+			else if(post.visibilityLevel == PostVisibilityLevel.VISIBILITY_FRIENDS) {
+				
+				if(userID < 1 /* user not signed in */
+					|| !await FriendsHelper.AreFriend(userID, post.pageID) /* not a friend */)
+					return PostAccessLevel.NO_ACCESS;
+				
+				else
+					return PostAccessLevel.BASIC_ACCESS;
+			}
+
+			// In case of public post
+			else if(post.visibilityLevel == PostVisibilityLevel.VISIBILITY_PUBLIC) {
+				
+				// Check if the user can see the page
+				if(await UserHelper.CanSeeUserPage(userID, post.userPageID))
+					return PostAccessLevel.BASIC_ACCESS;
+				
+				// Else no access to the user
+				return PostAccessLevel.NO_ACCESS;
+			}
+		}
+
+		// Group page
+		else if(post.kindPage == PostPageKind.PAGE_KIND_GROUP) {
+
+		}
+
+		throw Error("GetAccessLevel reached an unimplemented status!");
+	}
+
 	/**
 	 * Turn a database entry into a row object
 	 *