Method downloadFile

data/src/emulator.js:92–161

(path, progressCB, notWithPath, opts)

        }
    }
    downloadFile(path, progressCB, notWithPath, opts) {
        return new Promise(async cb => {
            const data = this.toData(path); //check other data types
            if (data) {
                data.then((game) => {
                    if (opts.method === "HEAD") {
                        cb({ headers: {} });
                    } else {
                        cb({ headers: {}, data: game });
                    }
                })
                return;
            }
            const basePath = notWithPath ? "" : this.config.dataPath;
            path = basePath + path;
            if (!notWithPath && this.config.filePaths && typeof this.config.filePaths[path.split("/").pop()] === "string") {
                path = this.config.filePaths[path.split("/").pop()];
            }
            let url;
            try { url = new URL(path) } catch(e) {};
            if (url && !["http:", "https:"].includes(url.protocol)) {
                //Most commonly blob: urls. Not sure what else it could be
                if (opts.method === "HEAD") {
                    cb({ headers: {} });
                    return;
                }
                try {
                    let res = await fetch(path)
                    if ((opts.type && opts.type.toLowerCase() === "arraybuffer") || !opts.type) {
                        res = await res.arrayBuffer();
                    } else {
                        res = await res.text();
                        try { res = JSON.parse(res) } catch(e) {}
                    }
                    if (path.startsWith("blob:")) URL.revokeObjectURL(path);
                    cb({ data: res, headers: {} });
                } catch(e) {
                    cb(-1);
                }
                return;
            }
            const xhr = new XMLHttpRequest();
            if (progressCB instanceof Function) {
                xhr.addEventListener("progress", (e) => {
                    const progress = e.total ? " " + Math.floor(e.loaded / e.total * 100).toString() + "%" : " " + (e.loaded / 1048576).toFixed(2) + "MB";
                    progressCB(progress);
                });
            }
            xhr.onload = function() {
                if (xhr.readyState === xhr.DONE) {
                    let data = xhr.response;
                    if (xhr.status.toString().startsWith("4") || xhr.status.toString().startsWith("5")) {
                        cb(-1);
                        return;
                    }
                    try { data = JSON.parse(data) } catch(e) {}
                    cb({
                        data: data,