fix!: require NODE_USE_ENV_PROXY for proxy support (#342)

BREAKING CHANGE: Custom proxy handling has been removed. If you use HTTP_PROXY or HTTPS_PROXY, you must now also set NODE_USE_ENV_PROXY=1 on the action step.

.github/workflows/test.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+      - beta
   pull_request:
   merge_group:
   workflow_dispatch:
@@ -33,7 +34,7 @@ jobs:
     name: end-to-end
     runs-on: ubuntu-latest
     # do not run from forks, as forks don’t have access to repository secrets
-    if: github.event_name == 'merge_group' || github.event.pull_request.head.repo.owner.login == github.event.pull_request.base.repo.owner.login
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.owner.login == github.event.pull_request.base.repo.owner.login
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
@@ -53,3 +54,28 @@ jobs:
         with:
           route: GET /installation/repositories
       - run: echo '${{ steps.get-repository.outputs.data }}'
+
+  end-to-end-proxy:
+    name: End-to-End with unreachable proxy
+    runs-on: ubuntu-latest
+    # do not run from forks, as forks don’t have access to repository secrets
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.owner.login == github.event.pull_request.base.repo.owner.login
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+          cache: 'npm'
+      - run: npm ci
+      - run: npm run build
+      - uses: ./ # Uses the action in the root directory
+        continue-on-error: true
+        id: test
+        env:
+          NODE_USE_ENV_PROXY: "1"
+          https_proxy: http://127.0.0.1:9
+        with:
+          app-id: ${{ vars.TEST_APP_ID }}
+          private-key: ${{ secrets.TEST_APP_PRIVATE_KEY }}
+      - name: Assert action failed through unreachable proxy
+        run: test "${{ steps.test.outcome }}" = "failure"

README.md

@@ -296,6 +296,24 @@ jobs:
           GITHUB_TOKEN: ${{ steps.create_token.outputs.token }}
 ```
 
+### Proxy support
+
+This action relies on Node.js native proxy support.
+
+If you set `HTTP_PROXY` or `HTTPS_PROXY`, also set `NODE_USE_ENV_PROXY: "1"` on the action step so Node.js honors those variables. If you need proxy bypass rules, set `NO_PROXY` alongside them.
+
+```yaml
+- uses: actions/create-github-app-token@v3
+  id: app-token
+  env:
+    HTTPS_PROXY: http://proxy.example.com:8080
+    NO_PROXY: github.example.com
+    NODE_USE_ENV_PROXY: "1"
+  with:
+    app-id: ${{ vars.APP_ID }}
+    private-key: ${{ secrets.PRIVATE_KEY }}
+```
+
 ## Inputs
 
 ### `app-id`

lib/request.js

@@ -4,6 +4,31 @@ import { request } from "@octokit/request";
 // Get the GitHub API URL from the action input and remove any trailing slash
 const baseUrl = core.getInput("github-api-url").replace(/\/$/, "");
 
+const proxyEnvironmentKeys = [
+  "https_proxy",
+  "HTTPS_PROXY",
+  "http_proxy",
+  "HTTP_PROXY",
+];
+
+function proxyEnvironmentConfigured() {
+  return proxyEnvironmentKeys.some((key) => process.env[key]);
+}
+
+function nativeProxySupportEnabled() {
+  return process.env.NODE_USE_ENV_PROXY === "1";
+}
+
+export function ensureNativeProxySupport() {
+  if (!proxyEnvironmentConfigured() || nativeProxySupportEnabled()) {
+    return;
+  }
+
+  throw new Error(
+    "A proxy environment variable is set, but Node.js native proxy support is not enabled. Set NODE_USE_ENV_PROXY=1 for this action step.",
+  );
+}
+
 // Configure the default settings for GitHub API requests
 export default request.defaults({
   headers: { "user-agent": "actions/create-github-app-token" },

main.js

@@ -5,7 +5,7 @@ import { createAppAuth } from "@octokit/auth-app";
 
 import { getPermissionsFromInputs } from "./lib/get-permissions-from-inputs.js";
 import { main } from "./lib/main.js";
-import request from "./lib/request.js";
+import request, { ensureNativeProxySupport } from "./lib/request.js";
 
 if (!process.env.GITHUB_REPOSITORY) {
   throw new Error("GITHUB_REPOSITORY missing, must be set to '<owner>/<repo>'");
@@ -15,31 +15,37 @@ if (!process.env.GITHUB_REPOSITORY_OWNER) {
   throw new Error("GITHUB_REPOSITORY_OWNER missing, must be set to '<owner>'");
 }
 
-const appId = core.getInput("app-id");
-const privateKey = core.getInput("private-key");
-const owner = core.getInput("owner");
-const repositories = core
-  .getInput("repositories")
-  .split(/[\n,]+/)
-  .map((s) => s.trim())
-  .filter((x) => x !== "");
+async function run() {
+  ensureNativeProxySupport();
 
-const skipTokenRevoke = core.getBooleanInput("skip-token-revoke");
+  const appId = core.getInput("app-id");
+  const privateKey = core.getInput("private-key");
+  const owner = core.getInput("owner");
+  const repositories = core
+    .getInput("repositories")
+    .split(/[\n,]+/)
+    .map((s) => s.trim())
+    .filter((x) => x !== "");
 
-const permissions = getPermissionsFromInputs(process.env);
+  const skipTokenRevoke = core.getBooleanInput("skip-token-revoke");
+
+  const permissions = getPermissionsFromInputs(process.env);
+
+  return main(
+    appId,
+    privateKey,
+    owner,
+    repositories,
+    permissions,
+    core,
+    createAppAuth,
+    request,
+    skipTokenRevoke,
+  );
+}
 
 // Export promise for testing
-export default main(
-  appId,
-  privateKey,
-  owner,
-  repositories,
-  permissions,
-  core,
-  createAppAuth,
-  request,
-  skipTokenRevoke,
-).catch((error) => {
+export default run().catch((error) => {
   /* c8 ignore next 3 */
   console.error(error);
   core.setFailed(error.message);

post.js

@@ -3,9 +3,15 @@
 import * as core from "@actions/core";
 
 import { post } from "./lib/post.js";
-import request from "./lib/request.js";
+import request, { ensureNativeProxySupport } from "./lib/request.js";
 
-post(core, request).catch((error) => {
+async function run() {
+  ensureNativeProxySupport();
+
+  return post(core, request);
+}
+
+run().catch((error) => {
   /* c8 ignore next 3 */
   console.error(error);
   core.setFailed(error.message);

tests/index.js

@@ -21,6 +21,14 @@ for (const file of testFiles) {
     const env = {
       GITHUB_OUTPUT: undefined,
       GITHUB_STATE: undefined,
+      HTTP_PROXY: undefined,
+      HTTPS_PROXY: undefined,
+      http_proxy: undefined,
+      https_proxy: undefined,
+      NO_PROXY: undefined,
+      no_proxy: undefined,
+      NODE_OPTIONS: undefined,
+      NODE_USE_ENV_PROXY: undefined,
     };
     const { stderr, stdout } = await execa("node", [`tests/${file}`], { env });
     t.snapshot(stderr, "stderr");

tests/main-proxy-requires-native-support.test.js

@@ -0,0 +1,14 @@
+process.env.GITHUB_REPOSITORY = "actions/create-github-app-token";
+process.env.GITHUB_REPOSITORY_OWNER = "actions";
+process.env.HTTPS_PROXY = "http://127.0.0.1:3128";
+
+const originalConsoleError = console.error;
+console.error = (...args) => {
+  originalConsoleError(
+    ...args.map((arg) => (arg instanceof Error ? arg.message : arg)),
+  );
+};
+
+await import("../main.js");
+await new Promise((resolve) => setImmediate(resolve));
+process.exitCode = 0;

tests/post-proxy-requires-native-support.test.js

@@ -0,0 +1,13 @@
+process.env["INPUT_GITHUB-API-URL"] = "https://api.github.com";
+process.env.HTTPS_PROXY = "http://127.0.0.1:3128";
+
+const originalConsoleError = console.error;
+console.error = (...args) => {
+  originalConsoleError(
+    ...args.map((arg) => (arg instanceof Error ? arg.message : arg)),
+  );
+};
+
+await import("../post.js");
+await new Promise((resolve) => setImmediate(resolve));
+process.exitCode = 0;

tests/snapshots/index.js.md

@@ -82,6 +82,16 @@ Generated by [AVA](https://avajs.dev).
     POST /app/installations/123456/access_tokens␊
     {"repositories":["create-github-app-token"]}`
 
+## main-proxy-requires-native-support.test.js
+
+> stderr
+
+    'A proxy environment variable is set, but Node.js native proxy support is not enabled. Set NODE_USE_ENV_PROXY=1 for this action step.'
+
+> stdout
+
+    '::error::A proxy environment variable is set, but Node.js native proxy support is not enabled. Set NODE_USE_ENV_PROXY=1 for this action step.'
+
 ## main-repo-skew.test.js
 
 > stderr
@@ -333,6 +343,16 @@ Generated by [AVA](https://avajs.dev).
     POST /app/installations/123456/access_tokens␊
     {"repositories":["create-github-app-token"],"permissions":{"issues":"write","pull_requests":"read"}}`
 
+## post-proxy-requires-native-support.test.js
+
+> stderr
+
+    'A proxy environment variable is set, but Node.js native proxy support is not enabled. Set NODE_USE_ENV_PROXY=1 for this action step.'
+
+> stdout
+
+    '::error::A proxy environment variable is set, but Node.js native proxy support is not enabled. Set NODE_USE_ENV_PROXY=1 for this action step.'
+
 ## post-revoke-token-fail-response.test.js
 
 > stderr