Add auth support (#21)

* Updates

* Update

* Update

* Update

* Update

* Yarn sometimes prefers npmrc, so use same token

* Description

* Update readme

* Feedback

* Add type

* new toolkit and scoped registries

* npmrc in RUNNER_TEMP

* Dont always auth

* Try exporting blank token

* Get auth working for now pending runner changes

* Fix string interpolation for auth token.

* Don't export both userconfigs

* Update authutil.js

* Add single quotes for authString

* Fix the registry string.

* Use userconfig and append trailing slash

* Keep in root of repo

* Try just adding auth token

* Remove auth token

* Try changes again

* Add tests

* Npm and GPR samples

* Add types

lib/authutil.js

@@ -0,0 +1,52 @@
+"use strict";
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const fs = __importStar(require("fs"));
+const os = __importStar(require("os"));
+const path = __importStar(require("path"));
+const core = __importStar(require("@actions/core"));
+const github = __importStar(require("@actions/github"));
+function configAuthentication(registryUrl) {
+    const npmrc = path.resolve(process.env['RUNNER_TEMP'] || process.cwd(), '.npmrc');
+    if (!registryUrl.endsWith('/')) {
+        registryUrl += '/';
+    }
+    writeRegistryToFile(registryUrl, npmrc);
+}
+exports.configAuthentication = configAuthentication;
+function writeRegistryToFile(registryUrl, fileLocation) {
+    let scope = core.getInput('scope');
+    if (!scope && registryUrl.indexOf('npm.pkg.github.com') > -1) {
+        scope = github.context.repo.owner;
+    }
+    if (scope && scope[0] != '@') {
+        scope = '@' + scope;
+    }
+    core.debug(`Setting auth in ${fileLocation}`);
+    let newContents = '';
+    if (fs.existsSync(fileLocation)) {
+        const curContents = fs.readFileSync(fileLocation, 'utf8');
+        curContents.split(os.EOL).forEach((line) => {
+            // Add current contents unless they are setting the registry
+            if (!line.toLowerCase().startsWith('registry')) {
+                newContents += line + os.EOL;
+            }
+        });
+    }
+    // Remove http: or https: from front of registry.
+    const authString = registryUrl.replace(/(^\w+:|^)/, '') + ':_authToken=${NODE_AUTH_TOKEN}';
+    const registryString = scope
+        ? `${scope}:registry=${registryUrl}`
+        : `registry=${registryUrl}`;
+    newContents += `${authString}${os.EOL}${registryString}`;
+    fs.writeFileSync(fileLocation, newContents);
+    core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
+    // Export empty node_auth_token so npm doesn't complain about not being able to find it
+    core.exportVariable('NODE_AUTH_TOKEN', 'XXXXX-XXXXX-XXXXX-XXXXX');
+}

lib/setup-node.js

@@ -17,6 +17,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
 const installer = __importStar(require("./installer"));
+const auth = __importStar(require("./authutil"));
 const path = __importStar(require("path"));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
@@ -30,6 +31,10 @@ function run() {
                 // TODO: installer doesn't support proxy
                 yield installer.getNode(version);
             }
+            const registryUrl = core.getInput('registry-url');
+            if (registryUrl) {
+                auth.configAuthentication(registryUrl);
+            }
             // TODO: setup proxy from runner proxy config
             const matchersPath = path.join(__dirname, '..', '.github');
             console.log(`##[add-matcher]${path.join(matchersPath, 'tsc.json')}`);