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diff --git a/Collapse file
‎lib/entry-points.js‎
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+9-4Lines changed: 9 additions & 4 deletions b/Collapse file
‎lib/entry-points.js‎
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+9-4Lines changed: 9 additions & 4 deletions
diff --git a/Collapse file
‎src/api-client.test.ts‎
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+17Lines changed: 17 additions & 0 deletions b/Collapse file
‎src/api-client.test.ts‎
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+17Lines changed: 17 additions & 0 deletions
diff --git a/Collapse file
‎src/api-client.ts‎
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+18-5Lines changed: 18 additions & 5 deletions b/Collapse file
‎src/api-client.ts‎
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+18-5Lines changed: 18 additions & 5 deletions
@@ -234,3 +234,20 @@ test("getRegistryProxy - returns value when both vars are set", async (t) => {
     )
     .passes(t.truthy);
 });
+
+test("getRegistryProxyConfig - gets the configuration from the env vars", async (t) => {
+  const host = "localhost";
+  const port = "1234";
+  const ca = "cert";
+
+  await callee(api.getRegistryProxyConfig)
+    .withArgs()
+    .withEnv(
+      getTestEnv({
+        [RegistryProxyVars.PROXY_HOST]: host,
+        [RegistryProxyVars.PROXY_PORT]: port,
+        [RegistryProxyVars.PROXY_CA_CERTIFICATE]: ca,
+      }),
+    )
+    .passes(t.like, { host, port, ca });
+});
@@ -65,15 +65,28 @@ export interface GitHubApiExternalRepoDetails {
  * if it is available in the environment.
  *
  * @param action The required Action state.
+ * @returns The hostname, port, and CA retrieved from the corresponding environment variables.
+ */
+export function getRegistryProxyConfig(action: ActionState<["ReadOnlyEnv"]>) {
+  return {
+    host: action.env.getOptional(RegistryProxyVars.PROXY_HOST),
+    port: action.env.getOptional(RegistryProxyVars.PROXY_PORT),
+    ca: action.env.getOptional(RegistryProxyVars.PROXY_CA_CERTIFICATE),
+  };
+}
+
+/**
+ * Gets the configuration for the private registry authentication proxy,
+ * and uses it to initialise a corresponding `ProxyAgent`.
+ *
+ * @param action The required Action state.
  * @returns A `ProxyAgent` corresponding to the private registry proxy,
  *          or `undefined` if we couldn't retrieve the host and port.
  */
 export function getRegistryProxy(
-  action: ActionState<["Logger", "Env"]>,
+  action: ActionState<["Logger", "ReadOnlyEnv"]>,
 ): ProxyAgent | undefined {
-  const host = action.env.getOptional(RegistryProxyVars.PROXY_HOST);
-  const port = action.env.getOptional(RegistryProxyVars.PROXY_PORT);
-  const cert = action.env.getOptional(RegistryProxyVars.PROXY_CA_CERTIFICATE);
+  const { host, port, ca } = getRegistryProxyConfig(action);
 
   if (host && port) {
     const uri = `http://${host}:${port}`;
@@ -84,7 +97,7 @@ export function getRegistryProxy(
       uri,
       keepAliveTimeout: 10,
       keepAliveMaxTimeout: 10,
-      requestTls: cert ? { ca: cert } : undefined,
+      requestTls: ca ? { ca } : undefined,
     });
   }