Fix bug in getCredentials + tests

src/start-proxy.ts

@@ -0,0 +1,77 @@
+import { parseLanguage, Language } from "./languages";
+import { Logger } from "./logging";
+
+export type Credential = {
+  type: string;
+  host?: string;
+  url?: string;
+  username?: string;
+  password?: string;
+  token?: string;
+};
+
+const LANGUAGE_TO_REGISTRY_TYPE: Record<Language, string> = {
+  java: "maven_repository",
+  csharp: "nuget_feed",
+  javascript: "npm_registry",
+  python: "python_index",
+  ruby: "rubygems_server",
+  rust: "cargo_registry",
+  // We do not have an established proxy type for these languages, thus leaving empty.
+  actions: "",
+  cpp: "",
+  go: "",
+  swift: "",
+} as const;
+
+// getCredentials returns registry credentials from action inputs.
+// It prefers `registries_credentials` over `registry_secrets`.
+// If neither is set, it returns an empty array.
+export function getCredentials(
+  logger: Logger,
+  registrySecrets: string | undefined,
+  registriesCredentials: string | undefined,
+  languageString: string | undefined,
+): Credential[] {
+  const language = languageString ? parseLanguage(languageString) : undefined;
+  const registryTypeForLanguage = language
+    ? LANGUAGE_TO_REGISTRY_TYPE[language]
+    : undefined;
+
+  let credentialsStr: string;
+  if (registriesCredentials !== undefined) {
+    logger.info(`Using registries_credentials input.`);
+    credentialsStr = Buffer.from(registriesCredentials, "base64").toString();
+  } else if (registrySecrets !== undefined) {
+    logger.info(`Using registry_secrets input.`);
+    credentialsStr = registrySecrets;
+  } else {
+    logger.info(`No credentials defined.`);
+    return [];
+  }
+
+  // Parse and validate the credentials
+  const parsed = JSON.parse(credentialsStr) as Credential[];
+  const out: Credential[] = [];
+  for (const e of parsed) {
+    if (e.url === undefined && e.host === undefined) {
+      throw new Error("Invalid credentials - must specify host or url");
+    }
+
+    // Filter credentials based on language if specified. `type` is the registry type.
+    // E.g., "maven_feed" for Java/Kotlin, "nuget_repository" for C#.
+    if (registryTypeForLanguage && e.type !== registryTypeForLanguage) {
+      continue;
+    }
+
+    out.push({
+      type: e.type,
+      host: e.host,
+      url: e.url,
+      username: e.username,
+      password: e.password,
+      token: e.token,
+    });
+  }
+  return out;
+}