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47 lines
1.3 KiB
47 lines
1.3 KiB
4 years ago
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const { PACKET_TYPES } = require("./commons");
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const withNativeBlob =
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typeof Blob === "function" ||
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(typeof Blob !== "undefined" &&
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Object.prototype.toString.call(Blob) === "[object BlobConstructor]");
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const withNativeArrayBuffer = typeof ArrayBuffer === "function";
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// ArrayBuffer.isView method is not defined in IE10
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const isView = obj => {
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return typeof ArrayBuffer.isView === "function"
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? ArrayBuffer.isView(obj)
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: obj && obj.buffer instanceof ArrayBuffer;
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};
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const encodePacket = ({ type, data }, supportsBinary, callback) => {
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if (withNativeBlob && data instanceof Blob) {
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if (supportsBinary) {
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return callback(data);
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} else {
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return encodeBlobAsBase64(data, callback);
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}
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} else if (
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withNativeArrayBuffer &&
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(data instanceof ArrayBuffer || isView(data))
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) {
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if (supportsBinary) {
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return callback(data instanceof ArrayBuffer ? data : data.buffer);
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} else {
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return encodeBlobAsBase64(new Blob([data]), callback);
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}
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}
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// plain string
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return callback(PACKET_TYPES[type] + (data || ""));
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};
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const encodeBlobAsBase64 = (data, callback) => {
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const fileReader = new FileReader();
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fileReader.onload = function() {
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const content = fileReader.result.split(",")[1];
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callback("b" + content);
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};
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return fileReader.readAsDataURL(data);
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};
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module.exports = encodePacket;
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