@aws-lambda-powertools/tracer
Version:
The tracer package for the Powertools for AWS Lambda (TypeScript) library
60 lines (59 loc) • 2.16 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getRequestURL = exports.isHttpSubsegment = exports.findHeaderAndDecode = void 0;
const node_url_1 = require("node:url");
const decoder = new TextDecoder();
/**
* The `fetch` implementation based on `undici` includes the headers as an array of encoded key-value pairs.
* This function finds the header with the given key and decodes the value.
*
* The function walks through the array of encoded headers and decodes the key of each pair.
* If the key matches the given key, the function returns the decoded value of the next element in the array.
*
* @param encodedHeaders The array of encoded headers
* @param key The key to search for
*/
const findHeaderAndDecode = (encodedHeaders, key) => {
let foundIndex = -1;
for (let i = 0; i < encodedHeaders.length; i += 2) {
const header = decoder.decode(encodedHeaders[i]);
if (header.toLowerCase() === key) {
foundIndex = i;
break;
}
}
if (foundIndex === -1) {
return null;
}
return decoder.decode(encodedHeaders[foundIndex + 1]);
};
exports.findHeaderAndDecode = findHeaderAndDecode;
/**
* Type guard to check if the given subsegment is an `HttpSubsegment`
*
* @param subsegment The subsegment to check
*/
const isHttpSubsegment = (subsegment) => {
return (subsegment !== undefined &&
'http' in subsegment &&
'parent' in subsegment &&
'namespace' in subsegment &&
subsegment.namespace === 'remote');
};
exports.isHttpSubsegment = isHttpSubsegment;
/**
* Convert the origin url to a URL object when it is a string and append the path if provided
*
* @param origin The request object containing the origin url and path
*/
const getRequestURL = (request) => {
if (typeof request.origin === 'string') {
return new node_url_1.URL(`${request.origin}${request.path || ''}`);
}
if (request.origin instanceof node_url_1.URL) {
request.origin.pathname = request.path || '';
return request.origin;
}
return undefined;
};
exports.getRequestURL = getRequestURL;