workadventure/front/src/Connexion/Room.ts

import Axios from "axios";
import { PUSHER_URL } from "../Enum/EnvironmentVariable";
import type { CharacterTexture } from "./LocalUser";

export class MapDetail {
    constructor(public readonly mapUrl: string, public readonly textures: CharacterTexture[] | undefined) {}
}

export interface RoomRedirect {
    redirectUrl: string;
}

export class Room {
    public readonly id: string;
    public readonly isPublic: boolean;
    private _mapUrl: string | undefined;
    private _textures: CharacterTexture[] | undefined;
    private instance: string | undefined;
    private readonly _search: URLSearchParams;

    private constructor(private roomUrl: URL) {
        this.id = roomUrl.pathname;

        if (this.id.startsWith("/")) {
            this.id = this.id.substr(1);
        }
        if (this.id.startsWith("_/")) {
            this.isPublic = true;
        } else if (this.id.startsWith("@/")) {
            this.isPublic = false;
        } else {
            throw new Error("Invalid room ID");
        }

        this._search = new URLSearchParams(roomUrl.search);
    }

    /**
     * Creates a "Room" object representing the room.
     * This method will follow room redirects if necessary, so the instance returned is a "real" room.
     */
    public static async createRoom(roomUrl: URL): Promise<Room> {
        let redirectCount = 0;
        while (redirectCount < 32) {
            const room = new Room(roomUrl);
            const result = await room.getMapDetail();
            if (result instanceof MapDetail) {
                return room;
            }
            redirectCount++;
            roomUrl = new URL(result.redirectUrl);
        }
        throw new Error("Room resolving seems stuck in a redirect loop after 32 redirect attempts");
    }

    public static getRoomPathFromExitUrl(exitUrl: string, currentRoomUrl: string): URL {
        const url = new URL(exitUrl, currentRoomUrl);
        return url;
    }

    /**
     * @deprecated USage of exitSceneUrl is deprecated and therefore, this method is deprecated too.
     */
    public static getRoomPathFromExitSceneUrl(
        exitSceneUrl: string,
        currentRoomUrl: string,
        currentMapUrl: string
    ): URL {
        const absoluteExitSceneUrl = new URL(exitSceneUrl, currentMapUrl);
        const baseUrl = new URL(currentRoomUrl);

        const currentRoom = new Room(baseUrl);
        let instance: string = "global";
        if (currentRoom.isPublic) {
            instance = currentRoom.instance as string;
        }

        baseUrl.pathname = "/_/" + instance + "/" + absoluteExitSceneUrl.host + absoluteExitSceneUrl.pathname;
        if (absoluteExitSceneUrl.hash) {
            baseUrl.hash = absoluteExitSceneUrl.hash;
        }

        return baseUrl;
    }

    /**
     * @deprecated
     */
    public static getIdFromIdentifier(
        identifier: string,
        baseUrl: string,
        currentInstance: string
    ): { roomId: string; hash: string | null } {
        let roomId = "";
        let hash = null;
        if (!identifier.startsWith("/_/") && !identifier.startsWith("/@/")) {
            //relative file link
            //Relative identifier can be deep enough to rewrite the base domain, so we cannot use the variable 'baseUrl' as the actual base url for the URL objects.
            //We instead use 'workadventure' as a dummy base value.
            const baseUrlObject = new URL(baseUrl);
            const absoluteExitSceneUrl = new URL(
                identifier,
                "http://workadventure/_/" + currentInstance + "/" + baseUrlObject.hostname + baseUrlObject.pathname
            );
            roomId = absoluteExitSceneUrl.pathname; //in case of a relative url, we need to create a public roomId
            roomId = roomId.substring(1); //remove the leading slash
            hash = absoluteExitSceneUrl.hash;
            hash = hash.substring(1); //remove the leading diese
            if (!hash.length) {
                hash = null;
            }
        } else {
            //absolute room Id
            const parts = identifier.split("#");
            roomId = parts[0];
            roomId = roomId.substring(1); //remove the leading slash
            if (parts.length > 1) {
                hash = parts[1];
            }
        }
        return { roomId, hash };
    }

    private async getMapDetail(): Promise<MapDetail | RoomRedirect> {
        const result = await Axios.get(`${PUSHER_URL}/map`, {
            params: {
                playUri: this.roomUrl.toString(),
            },
        });

        const data = result.data;
        if (data.redirectUrl) {
            return {
                redirectUrl: data.redirectUrl as string,
            };
        }
        console.log("Map ", this.id, " resolves to URL ", data.mapUrl);
        this._mapUrl = data.mapUrl;
        this._textures = data.textures;
        return new MapDetail(data.mapUrl, data.textures);
    }

    /**
     * Instance name is:
     * - In a public URL: the second part of the URL ( _/[instance]/map.json)
     * - In a private URL: [organizationId/worldId]
     */
    public getInstance(): string {
        if (this.instance !== undefined) {
            return this.instance;
        }

        if (this.isPublic) {
            const match = /_\/([^/]+)\/.+/.exec(this.id);
            if (!match) throw new Error('Could not extract instance from "' + this.id + '"');
            this.instance = match[1];
            return this.instance;
        } else {
            const match = /@\/([^/]+)\/([^/]+)\/.+/.exec(this.id);
            if (!match) throw new Error('Could not extract instance from "' + this.id + '"');
            this.instance = match[1] + "/" + match[2];
            return this.instance;
        }
    }

    /**
     * @deprecated
     */
    private parsePrivateUrl(url: string): { organizationSlug: string; worldSlug: string; roomSlug?: string } {
        const regex = /@\/([^/]+)\/([^/]+)(?:\/([^/]*))?/gm;
        const match = regex.exec(url);
        if (!match) {
            throw new Error("Invalid URL " + url);
        }
        const results: { organizationSlug: string; worldSlug: string; roomSlug?: string } = {
            organizationSlug: match[1],
            worldSlug: match[2],
        };
        if (match[3] !== undefined) {
            results.roomSlug = match[3];
        }
        return results;
    }

    public isDisconnected(): boolean {
        const alone = this._search.get("alone");
        if (alone && alone !== "0" && alone.toLowerCase() !== "false") {
            return true;
        }
        return false;
    }

    public get search(): URLSearchParams {
        return this._search;
    }

    /**
     * 2 rooms are equal if they share the same path (but not necessarily the same hash)
     * @param room
     */
    public isEqual(room: Room): boolean {
        return room.key === this.key;
    }

    /**
     * A key representing this room
     */
    public get key(): string {
        const newUrl = new URL(this.roomUrl.toString());
        newUrl.hash = "";
        return newUrl.toString();
    }

    get textures(): CharacterTexture[] | undefined {
        return this._textures;
    }

    get mapUrl(): string {
        if (!this._mapUrl) {
            throw new Error("Map URL not fetched yet");
        }
        return this._mapUrl;
    }
}