@tarojs/taro-h5/dist/api/network/utils.js

Taro h5 framework

/**
 * HTTP Response Header 事件回调函数的参数
 * @typedef {Object} HeadersReceivedParam
 * @property {Object} header 开发者服务器返回的 HTTP Response Header
 */
/**
 * HTTP Response Header 事件的回调函数
 * @callback HeadersReceivedCallback
 * @param {HeadersReceivedParam} res 参数
 */
/**
 * 进度变化回调函数的参数
 * @typedef {Object} ProgressUpdateParam
 * @property {number} progress 进度百分比
 * @property {number} [totalBytesWritten] 已经下载的数据长度，单位 Bytes
 * @property {number} [totalBytesSent] 已经上传的数据长度，单位 Bytes
 * @property {number} [totalBytesExpectedToWrite] 预期需要下载的数据总长度，单位 Bytes
 * @property {number} [totalBytesExpectedToSend] 预期需要上传的数据总长度，单位 Bytes
 */
/**
 * 进度变化事件的回调函数
 * @callback ProgressUpdateCallback
 * @param {ProgressUpdateParam} res 参数
 */
const NETWORK_TIMEOUT = 60000;
const XHR_STATS = {
    UNSENT: 0, // Client has been created. open() not called yet.
    OPENED: 1, // open() has been called.
    HEADERS_RECEIVED: 2, // send() has been called, and headers and status are available.
    LOADING: 3, // Downloading; responseText holds partial data.
    DONE: 4 // The operation is complete.
};
/**
 * 设置xhr的header
 * @param {XMLHttpRequest} xhr
 * @param {Object} header
 */
const setHeader = (xhr, header) => {
    let headerKey;
    for (headerKey in header) {
        xhr.setRequestHeader(headerKey, header[headerKey]);
    }
};
/**
 * 将 blob url 转化为文件
 * @param {string} url 要转换的 blob url
 * @returns {Promise<File>}
 */
const convertObjectUrlToBlob = (url, timeout = NETWORK_TIMEOUT) => {
    return new Promise((resolve, reject) => {
        const xhr = new XMLHttpRequest();
        let settled = false;
        const settle = (success, value) => {
            if (settled)
                return;
            settled = true;
            xhr.onload = null;
            xhr.onerror = null;
            xhr.onabort = null;
            xhr.ontimeout = null;
            if (success)
                resolve(value);
            else
                reject(value);
        };
        try {
            xhr.open('GET', url, true);
            xhr.responseType = 'blob';
            xhr.withCredentials = true;
            xhr.timeout = timeout;
            xhr.onload = () => {
                if (xhr.status === 200)
                    settle(true, xhr.response);
                else
                    settle(false, { status: xhr.status });
            };
            xhr.onerror = () => settle(false, { status: xhr.status, message: 'file conversion failed' });
            xhr.onabort = () => settle(false, { status: xhr.status, message: 'abort' });
            xhr.ontimeout = () => settle(false, { status: xhr.status, message: 'timeout' });
            xhr.send();
        }
        catch (error) {
            settle(false, error);
        }
    });
};

export { NETWORK_TIMEOUT, XHR_STATS, convertObjectUrlToBlob, setHeader };
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