Can get the posts of a group

src/helpers/GroupsHelper.ts

@@ -304,6 +304,11 @@ export class GroupsHelper {
 	 * @param userID The ID of target user
 	 */
 	public static async GetMembershipLevel(groupID: number, userID: number) : Promise<GroupMembershipLevels> {
+		
+		// If the user is not signed in
+		if(userID < 1)
+			return GroupMembershipLevels.VISITOR;
+		
 		const result = await DatabaseHelper.Query({
 			table: GROUPS_MEMBERS_TABLE,
 			where: {

src/helpers/PostsHelper.ts

@@ -108,6 +108,56 @@ export class PostsHelper {
 		return entries.map((r) => this.DBToPost(r));
 	}
 
+	/**
+	 * Get the posts of a group
+	 * 
+	 * @param userID The ID of the user making the request
+	 * @param groupID The ID of the target group
+	 * @param startFrom Start point. 0 for none
+	 */
+	public static async GetGroupPosts(userID: number, groupID: number, 
+		startFrom: number = 0, limit: number = 10) : Promise<Array<Post>> {
+
+		if(limit < 1)
+			throw new Error("Limit (" + limit +") is invalid!");
+
+		// Check membership of the user
+		const membership = await GroupsHelper.GetMembershipLevel(groupID, userID);
+		const canSeeAllPosts = membership <= GroupMembershipLevels.MEMBER;
+
+		const visibilityLevel = canSeeAllPosts ? PostVisibilityLevel.VISIBILITY_GROUP_MEMBERS : PostVisibilityLevel.VISIBILITY_PUBLIC;
+		
+
+		// Prepare request
+
+		// === VISIBILITY RESTRICTION ===
+		let customWhere = "(niveau_visibilite <= ?)";
+		let customWhereArgs = [visibilityLevel.toString()];
+		// == /VISIBILITY RESTRICTION ===
+
+
+		// === START POINT ===
+		if(startFrom != 0) {
+			customWhere += " AND ID <= ?";
+			customWhereArgs.push(startFrom.toString());
+		}
+		// == /START POINT ===
+
+
+		const results = await DatabaseHelper.Query({
+			table: TABLE_NAME,
+			where: {
+				group_id: groupID
+			},
+			customWhere: customWhere,
+			customWhereArgs: customWhereArgs,
+			order: "ID DESC",
+			limit: limit
+		});
+
+		return results.map((r) => this.DBToPost(r));
+	}
+
 	/**
 	 * Get the access level of a user over a post
 	 *