@loopback/rest
Version:
Expose controllers as REST endpoints and route REST API requests to controller methods
62 lines • 2.3 kB
JavaScript
;
// Copyright IBM Corp. and LoopBack contributors 2017,2020. All Rights Reserved.
// Node module: @loopback/rest
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
Object.defineProperty(exports, "__esModule", { value: true });
exports.writeResultToResponse = void 0;
const stream_1 = require("stream");
/**
* Writes the result from Application controller method
* into the HTTP response
*
* @param response - HTTP Response
* @param result - Result from the API to write into HTTP Response
*/
function writeResultToResponse(
// not needed and responsibility should be in the sequence.send
response,
// result returned back from invoking controller method
result) {
// Bypass response writing if the controller method returns `response` itself
// or the response headers have been sent
if (result === response || response.headersSent) {
return;
}
if (result === undefined) {
response.statusCode = 204;
response.end();
return;
}
const isStream = result instanceof stream_1.Readable || typeof (result === null || result === void 0 ? void 0 : result.pipe) === 'function';
if (isStream) {
response.setHeader('Content-Type', 'application/octet-stream');
// Stream
result.pipe(response);
return;
}
switch (typeof result) {
case 'object':
case 'boolean':
case 'number':
if (Buffer.isBuffer(result)) {
// Buffer for binary data
response.setHeader('Content-Type', 'application/octet-stream');
}
else {
// TODO(ritch) remove this, should be configurable
// See https://github.com/loopbackio/loopback-next/issues/436
response.setHeader('Content-Type', 'application/json');
// TODO(bajtos) handle errors - JSON.stringify can throw
result = JSON.stringify(result);
}
break;
default:
response.setHeader('Content-Type', 'text/plain');
result = result.toString();
break;
}
response.end(result);
}
exports.writeResultToResponse = writeResultToResponse;
//# sourceMappingURL=writer.js.map