"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = handleRangeHeaders;
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var _rangeParser = _interopRequireDefault(require("range-parser"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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function handleRangeHeaders(context, content, req, res) {
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// assumes express API. For other servers, need to add logic to access
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// alternative header APIs
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if (res.set) {
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res.set("Accept-Ranges", "bytes");
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} else {
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res.setHeader("Accept-Ranges", "bytes");
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}
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let range; // Express API
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if (req.get) {
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range = req.get("range");
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} // Node.js API
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else {
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({
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range
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} = req.headers);
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}
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if (range) {
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const ranges = (0, _rangeParser.default)(content.length, range); // unsatisfiable
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if (ranges === -1) {
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// Express API
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if (res.set) {
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res.set("Content-Range", `bytes */${content.length}`);
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res.status(416);
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} // Node.js API
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else {
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// eslint-disable-next-line no-param-reassign
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res.statusCode = 416;
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res.setHeader("Content-Range", `bytes */${content.length}`);
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}
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} else if (ranges === -2) {
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// malformed header treated as regular response
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context.logger.error("A malformed Range header was provided. A regular response will be sent for this request.");
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} else if (ranges.length !== 1) {
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// multiple ranges treated as regular response
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context.logger.error("A Range header with multiple ranges was provided. Multiple ranges are not supported, so a regular response will be sent for this request.");
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} else {
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// valid range header
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const {
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length
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} = content; // Express API
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if (res.set) {
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// Content-Range
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res.status(206);
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res.set("Content-Range", `bytes ${ranges[0].start}-${ranges[0].end}/${length}`);
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} // Node.js API
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else {
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// Content-Range
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// eslint-disable-next-line no-param-reassign
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res.statusCode = 206;
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res.setHeader("Content-Range", `bytes ${ranges[0].start}-${ranges[0].end}/${length}`);
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} // eslint-disable-next-line no-param-reassign
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content = content.slice(ranges[0].start, ranges[0].end + 1);
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}
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}
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return content;
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}
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