@unleash/proxy
Version:
The Unleash Proxy (Open-Source)
47 lines • 1.79 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = requireContentType;
const type_is_1 = require("type-is");
const DEFAULT_ACCEPTED_CONTENT_TYPE = 'application/json';
/**
* Builds an express middleware that checks the content-type header of requests with bodies.
*
* If the request has no body (as determined by the `type-is` library's
* `hasBody` function), this middleware passes it along to the next in line.
*
* If the request has a body, it checks whether the content-type matches one of
* the accepted content types, returning a 415 if it doesn't.
*
* If the request has a body, but not no content-type header, it will modify the
* request and add the first accepted content type as the content-type header,
* passing it along to the next request handler.
*
* @param {String} acceptedContentTypes - The list of content-types the middleware
* should accept. Defaults to ['application/json'] if none are provided.
*
* @returns {function(Request, Response, NextFunction): void}
*/
function requireContentType(...acceptedContentTypes) {
if (acceptedContentTypes.length === 0) {
acceptedContentTypes.push(DEFAULT_ACCEPTED_CONTENT_TYPE);
}
return (req, res, next) => {
const contentType = req.header('Content-Type');
if ((0, type_is_1.hasBody)(req)) {
if (!contentType) {
req.headers['content-type'] = acceptedContentTypes[0];
next();
}
else if ((0, type_is_1.is)(contentType, acceptedContentTypes)) {
next();
}
else {
res.status(415).end();
}
}
else {
next();
}
};
}
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