Implement groups visibility system

src/entities/Group.ts

@@ -0,0 +1,26 @@
+/**
+ * Single group information
+ * 
+ * @author Pierre HUBERT
+ */
+
+/**
+ * Group visibility level
+ */
+export enum GroupVisibilityLevel {
+	OPEN_GROUP = 0,
+	PRIVATE_GROUP = 1,
+	SECRETE_GROUP = 2
+}
+
+/**
+ * Access level of a user to a group
+ */
+export enum GroupsAccessLevel {
+	NO_ACCESS = 0, //Can not even know if the group exists or not
+	LIMITED_ACCESS = 1, //Access to the name of the group only
+	VIEW_ACCESS = 2, //Can see the posts of the group, but not a member of the group
+	MEMBER_ACCESS = 3, //Member access (same as view access but as member)
+	MODERATOR_ACCESS = 4, //Can create posts, even if posts creation is restricted
+	ADMIN_ACCESS = 5, //Can do everything
+}

src/entities/GroupMember.ts

@@ -0,0 +1,14 @@
+/**
+ * Group membership information
+ * 
+ * @author Pierre HUBERT
+ */
+
+export enum GroupMembershipLevels {
+	ADMINISTRATOR = 0,
+    MODERATOR = 1,
+	MEMBER = 2,
+	INVITED = 3,
+	PENDING = 4, //When the group membership has not been approved yet
+	VISITOR = 5, //Simple visitor
+}

src/entities/RequestHandler.ts

@@ -7,6 +7,8 @@ import { UploadedFile } from "express-fileupload";
 import { prepareFileCreation, generateNewUserDataFileName, pathUserData } from "../utils/UserDataUtils";
 import * as sharp from 'sharp';
 import { UserHelper } from "../helpers/UserHelper";
+import { GroupsAccessLevel } from "./Group";
+import { GroupsHelper } from "../helpers/GroupsHelper";
 
 /**
  * Response to a request
@@ -196,6 +198,41 @@ export class RequestHandler {
 		return userID;
 	}
 
+	/**
+	 * Get a POST group ID
+	 * 
+	 * @param name The name of the POST field
+	 */
+	public async postGroupID(name: string) : Promise<number> {
+		const groupID = this.postInt(name);
+
+		if(!await GroupsHelper.Exists(groupID))
+			this.error(404, "Specified group not found!");
+
+		return groupID;
+	}
+
+	/**
+	 * Get a POST group ID with a check for access level of current user
+	 * 
+	 * @param name The name of the POST field containing group ID
+	 * @param minVisibility Minimum visiblity requested to the group
+	 * @returns The ID of the group (throws in case of failure)
+	 */
+	public async postGroupIDWithAccess(name: string, minVisibility : GroupsAccessLevel) : Promise<number> {
+		const groupID = await this.postGroupID(name);
+
+		const access = await GroupsHelper.GetAccessLevel(groupID, this.getUserId());
+
+		if(access == GroupsAccessLevel.NO_ACCESS)
+			this.error(404, "Specified group not found!");
+		
+		if(access < minVisibility)
+			this.error(401, "You do not have enough rights to perform what you intend to do on this group!");
+		
+		return groupID;
+	}
+
 	/**
 	 * Get information about an uploaded file
 	 *