github
diff --git a/‎lib/start-proxy-action.js‎
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Lines changed: 10 additions & 0 deletions
diff --git a/‎lib/start-proxy-action.js.map‎
Lines changed: 1 addition & 1 deletion b/‎lib/start-proxy-action.js.map‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎src/start-proxy-action.ts‎
Lines changed: 13 additions & 0 deletions b/‎src/start-proxy-action.ts‎
Lines changed: 13 additions & 0 deletions
diff --git a/‎start-proxy/action.yml‎
Lines changed: 3 additions & 0 deletions b/‎start-proxy/action.yml‎
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@@ -17,6 +17,11 @@ const PROXY_USER = "proxy_user";
 const KEY_SIZE = 2048;
 const KEY_EXPIRY_YEARS = 2;
 
+const LANGUAGE_TO_REGISTRY_TYPE = {
+  "java-kotlin": "maven_repository",
+  csharp: "nuget_feed",
+} as const;
+
 type CertificateAuthority = {
   cert: string;
   key: string;
@@ -192,6 +197,7 @@ function getCredentials(logger: Logger): Credential[] {
     "registries_credentials",
   );
   const registrySecrets = actionsUtil.getOptionalInput("registry_secrets");
+  const language = actionsUtil.getOptionalInput("language");
 
   let credentialsStr: string;
   if (registriesCredentials !== undefined) {
@@ -212,6 +218,13 @@ function getCredentials(logger: Logger): Credential[] {
     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 (language && LANGUAGE_TO_REGISTRY_TYPE[language] !== e.type) {
+      continue;
+    }
+
     out.push({
       type: e.type,
       host: e.host,
 
@@ -16,6 +16,9 @@ inputs:
     description: GitHub token to use for authenticating with this instance of GitHub, used to upload debug artifacts.
     default: ${{ github.token }}
     required: false
+  language:
+    description: The programming language to setup the proxy for the correct ecosystem
+    required: false
 outputs:
   proxy_host:
     description: The IP address of the proxy