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refactor(astro/core/app/node): move function declaration out of parent and improve documentation

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* Moved inner function `functionName` outside its parent function for better code organization and readability.
* Improved JSDoc annotations for `functionName`, detailing parameters, return type, and usage.
This commit is contained in:
Jahir Vidrio 2024-10-13 12:41:06 +00:00
parent bbc72a1f31
commit 209fc08837
1 changed files with 38 additions and 9 deletions
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47
packages/astro/src/core/app/node.ts
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@ -63,17 +63,15 @@ export class NodeApp extends App {
static createRequest(req: NodeRequest, { skipBody = false } = {}): Request {
const isEncrypted = 'encrypted' in req.socket && req.socket.encrypted;
// Parses multiple header and returns first value if available.
const getFirstForwardedValue = (multiValueHeader?: string | string[]) => {
return multiValueHeader
?.toString()
?.split(',')
.map((e) => e.trim())?.[0];
};
/**
* Some proxies append values with spaces and some do not.
* We need to handle it here and parse the header correctly.
*
* @see getFirstForwardedValue
*/
// Get the used protocol between the end client and first proxy.
// NOTE: Some proxies append values with spaces and some do not.
// We need to handle it here and parse the header correctly.
// @example "https, http,http" => "http"
const forwardedProtocol = getFirstForwardedValue(req.headers['x-forwarded-proto']);
const protocol = forwardedProtocol ?? (isEncrypted ? 'https' : 'http');
@ -162,6 +160,37 @@ export class NodeApp extends App {
}
}
/**
* Retrieves the first value from a header that may contain multiple comma-separated values.
*
* This function is intended to handle HTTP headers that might include multiple values, such as the `X-Forwarded-For` header.
* If the header contains multiple values separated by commas, it returns the first value. It also trims any extra whitespace from the result.
*
* @param {string | string[]} [multiValueHeader] - The header that contains one or more values. It can be a string with comma-separated values or an array of strings.
* @returns {string | undefined} The first value from the header, trimmed of any surrounding whitespace, or `undefined` if no value is provided.
*
* @example
* // Example with a string
* const header = '192.168.1.1, 192.168.1.2';
* const firstValue = getFirstForwardedValue(header); // '192.168.1.1'
*
* @example
* // Example with an array
* const headerArray = ['192.168.1.1', '192.168.1.2'];
* const firstValue = getFirstForwardedValue(headerArray); // '192.168.1.1'
*
* @remarks
* Some proxies append values without spaces, while others add spaces between values.
* This function ensures consistent parsing by handling both cases and returning the first value correctly formatted.
*/
function getFirstForwardedValue(multiValueHeader?: string | string[]) {
return multiValueHeader
?.toString()
?.split(',')
?.at(0)
?.trim();
}
function makeRequestHeaders(req: NodeRequest): Headers {
const headers = new Headers();
for (const [name, value] of Object.entries(req.headers)) {