update ts docs

packages/cache/__tests__/util.test.ts

@@ -8,34 +8,28 @@ describe('maskSigUrl', () => {
     jest.clearAllMocks()
   })
 
-  it('returns the original URL if no sig parameter is present', () => {
+  it('does nothing if no sig parameter is present', () => {
     const url = 'https://example.com'
-    const maskedUrl = maskSigUrl(url)
-    expect(maskedUrl).toBe(url)
+    maskSigUrl(url)
     expect(setSecret).not.toHaveBeenCalled()
   })
 
   it('masks the sig parameter in the middle of the URL and sets it as a secret', () => {
     const url = 'https://example.com/?param1=value1&sig=12345&param2=value2'
-    const maskedUrl = maskSigUrl(url)
-    expect(maskedUrl).toBe(
-      'https://example.com/?param1=value1&sig=***&param2=value2'
-    )
+    maskSigUrl(url)
     expect(setSecret).toHaveBeenCalledWith('12345')
     expect(setSecret).toHaveBeenCalledWith(encodeURIComponent('12345'))
   })
 
-  it('returns the original URL if it is empty', () => {
+  it('does nothing if the URL is empty', () => {
     const url = ''
-    const maskedUrl = maskSigUrl(url)
-    expect(maskedUrl).toBe('')
+    maskSigUrl(url)
     expect(setSecret).not.toHaveBeenCalled()
   })
 
   it('handles URLs with fragments', () => {
     const url = 'https://example.com?sig=12345#fragment'
-    const maskedUrl = maskSigUrl(url)
-    expect(maskedUrl).toBe('https://example.com/?sig=***#fragment')
+    maskSigUrl(url)
     expect(setSecret).toHaveBeenCalledWith('12345')
     expect(setSecret).toHaveBeenCalledWith(encodeURIComponent('12345'))
   })

packages/cache/src/internal/shared/util.ts

@@ -2,13 +2,23 @@ import {debug, setSecret} from '@actions/core'
 
 /**
  * Masks the `sig` parameter in a URL and sets it as a secret.
- * @param url The URL containing the `sig` parameter.
- * @returns A masked URL where the sig parameter value is replaced with '***' if found,
- *          or the original URL if no sig parameter is present.
+ *
+ * @param url - The URL containing the signature parameter to mask
+ * @remarks
+ * This function attempts to parse the provided URL and identify the 'sig' query parameter.
+ * If found, it registers both the raw and URL-encoded signature values as secrets using
+ * the Actions `setSecret` API, which prevents them from being displayed in logs.
+ *
+ * The function handles errors gracefully if URL parsing fails, logging them as debug messages.
+ *
+ * @example
+ * ```typescript
+ * // Mask a signature in an Azure SAS token URL
+ * maskSigUrl('https://example.blob.core.windows.net/container/file.txt?sig=abc123&se=2023-01-01');
+ * ```
  */
-export function maskSigUrl(url: string): string {
-  if (!url) return url
-
+export function maskSigUrl(url: string): void {
+  if (!url) return
   try {
     const parsedUrl = new URL(url)
     const signature = parsedUrl.searchParams.get('sig')
@@ -17,7 +27,6 @@ export function maskSigUrl(url: string): string {
       setSecret(signature)
       setSecret(encodeURIComponent(signature))
       parsedUrl.searchParams.set('sig', '***')
-      return parsedUrl.toString()
     }
   } catch (error) {
     debug(
@@ -26,18 +35,34 @@ export function maskSigUrl(url: string): string {
       }`
     )
   }
-  return url
 }
 
 /**
- * Masks any URLs containing signature parameters in the provided object
+ * Masks sensitive information in URLs containing signature parameters.
+ * Currently supports masking 'sig' parameters in the 'signed_upload_url'
+ * and 'signed_download_url' properties of the provided object.
+ *
+ * @param body - The object should contain a signature
+ * @remarks
+ * This function extracts URLs from the object properties and calls maskSigUrl
+ * on each one to redact sensitive signature information. The function doesn't
+ * modify the original object; it only marks the signatures as secrets for
+ * logging purposes.
+ *
+ * @example
+ * ```typescript
+ * const responseBody = {
+ *   signed_upload_url: 'https://blob.core.windows.net/?sig=abc123',
+ *   signed_download_url: 'https://blob.core/windows.net/?sig=def456'
+ * };
+ * maskSecretUrls(responseBody);
+ * ```
  */
 export function maskSecretUrls(body: Record<string, unknown> | null): void {
   if (typeof body !== 'object' || body === null) {
     debug('body is not an object or is null')
     return
   }
-
   if (
     'signed_upload_url' in body &&
     typeof body.signed_upload_url === 'string'