如何设置Web Workers的内容安全策略以在Edge / Safari中工作?

时间:2019-02-15 18:08:15

标签: javascript web-worker content-security-policy nginx-config

我一直在找回错误代码:18,尝试使用Web Worker时来自Edge和Safari的SecurityError。但是,在Firefox / Chrome中,工作人员很好。我正在使用一个内联工作程序,我将零依赖数据处理函数传递给了该工作程序。

我的CSP看上去:

add_header Content-Security-Policy "default-src 'self'; worker-src 'self' 'inline' *.example.com";

我可以自己添加其他样式,例如本地样式表和googleapis.com,但我很好奇如何使Worker不会引发安全错误

来自worker method的片段

// Create an "inline" worker (1:1 at definition time)
    const worker = new Worker(
        // Use a data URI for the worker's src. It inlines the target function and an RPC handler:
        'data:,$$='+asyncFunction+';onmessage='+(e => {
            /* global $$ */

            // Invoking within then() captures exceptions in the supplied async function as rejections
            Promise.resolve(e.data[1]).then(
                v => $$.apply($$, v)
            ).then(
                // success handler - callback(id, SUCCESS(0), result)
                // if `d` is transferable transfer zero-copy
                d => {
                    postMessage([e.data[0], 0, d], [d].filter(x => (
                        (x instanceof ArrayBuffer) ||
                        (x instanceof MessagePort) ||
                        (x instanceof ImageBitmap)
                    )));
                },
                // error handler - callback(id, ERROR(1), error)
                er => { postMessage([e.data[0], 1, '' + er]); }
            );
        })
    );

Edge为工作程序抛出此错误:

  [object DOMException]: {code: 18, message: "SecurityError", name: 
    "SecurityError"}
    code: 18
    message: "SecurityError"
    name: "SecurityError"

1 个答案:

答案 0 :(得分:1)

我不确定为什么数据url导致安全错误,但是您可以使用URL.createObjectURL加载工作脚本,该脚本在Edge中似乎可以正常工作(我没有在野生动物园中对其进行测试)。

这里是这样的:

// Create the worker script as a string
const script = '$$='+asyncFunction+';onmessage='+(e => {
        /* global $$ */

        // Invoking within then() captures exceptions in the supplied async function as rejections
        Promise.resolve(e.data[1]).then(
            v => $$.apply($$, v)
        ).then(
            // success handler - callback(id, SUCCESS(0), result)
            // if `d` is transferable transfer zero-copy
            d => {
                postMessage([e.data[0], 0, d], [d].filter(x => (
                    (x instanceof ArrayBuffer) ||
                    (x instanceof MessagePort) ||
                    (x instanceof ImageBitmap)
                )));
            },
            // error handler - callback(id, ERROR(1), error)
            er => { postMessage([e.data[0], 1, '' + er]); }
        );
    });

// Create a local url to load the worker
const blob = new Blob([script]);
const workerUrl = URL.createObjectURL(blob);
const worker = new Worker(workerUrl);

让我知道您是否需要任何澄清!