CloudflareService.js

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
const axios_1 = require("axios");
const StatusesService_1 = require("./StatusesService");
const common_1 = require("../utils/common");
const STATUS_FILE_PREFIX = "bs";
class CloudflareService {
    constructor(cdnUrl, defaultBucket) {
        this._cdnUrl = "";
        this._defaultBucket = "";
        if (!cdnUrl) {
            throw new Error("CDN URL Must not be empty");
        }
        if (!defaultBucket) {
            throw new Error("Default bucket must not be empty");
        }
        this._cdnUrl = cdnUrl;
        this._defaultBucket = defaultBucket;
        this._statusesService = new StatusesService_1.default();
    }
    fetchFile(fileName, bucket = this._defaultBucket) {
        return __awaiter(this, void 0, void 0, function* () {
            // v?= is a dirty fix to prevent caching of the CORS error response in case file is missing.
            // Because of browser caching CORS error in case of missing file, it's not possible to retrieve it when it's being uploaded.
            // Dig into https://www.backblaze.com/b2/docs/cors_rules.html and fix
            const { data } = yield axios_1.default(`${this._cdnUrl}/file/${bucket}/${fileName}?v=${Math.random()}`);
            return data;
        });
    }
    fetchStatusData(statusFileName) {
        return __awaiter(this, void 0, void 0, function* () {
            const rawStatusData = (yield this.fetchFile(statusFileName));
            let decodedResult;
            try {
                decodedResult = this._statusesService.decodeStatusObject(new Uint8Array(common_1.base64ToArrayBuffer(rawStatusData.Status)));
            }
            catch (e) {
                throw new Error("Error decoding status object");
            }
            return {
                status: decodedResult.statusObject,
                merkleTreeId: rawStatusData.MerkleTreeID,
                transactionHash: rawStatusData.TransactionID,
                statusRaw: rawStatusData.Status,
                statusClassName: decodedResult.className,
            };
        });
    }
    readStatuses(statusId) {
        return __awaiter(this, void 0, void 0, function* () {
            let finished = false;
            let currentIndex = 1;
            const statuses = [];
            while (!finished) {
                try {
                    const statusData = yield this.fetchStatusData(`${STATUS_FILE_PREFIX}_${statusId}_${currentIndex}`);
                    statuses.push(statusData);
                    currentIndex++;
                }
                catch (error) {
                    // Axios error. Finishing fetching statuses.
                    if (error.isAxiosError) {
                        finished = true;
                    }
                    else {
                        throw error;
                    }
                }
            }
            return statuses;
        });
    }
    getMerkleTree(fileName) {
        return __awaiter(this, void 0, void 0, function* () {
            const merkleTreeFileContents = (yield this.fetchFile(fileName));
            const statusesData = yield Promise.all(merkleTreeFileContents.map((statusFileName) => {
                return this.fetchStatusData(statusFileName);
            }));
            const statusesMap = statusesData.reduce((acc, statusData, index) => {
                Object.assign(acc, {
                    [merkleTreeFileContents[index].toLowerCase()]: statusData,
                });
                return acc;
            }, {});
            return Object.keys(statusesMap)
                .sort()
                .map((key) => statusesMap[key].statusRaw);
        });
    }
}
exports.default = CloudflareService;