feat: add per-provider scope probes to channels capabilities

extensions/msteams/src/probe.ts

@@ -7,8 +7,52 @@ export type ProbeMSTeamsResult = {
   ok: boolean;
   error?: string;
   appId?: string;
+  graph?: {
+    ok: boolean;
+    error?: string;
+    roles?: string[];
+    scopes?: string[];
+  };
 };
 
+function readAccessToken(value: unknown): string | null {
+  if (typeof value === "string") return value;
+  if (value && typeof value === "object") {
+    const token =
+      (value as { accessToken?: unknown }).accessToken ??
+      (value as { token?: unknown }).token;
+    return typeof token === "string" ? token : null;
+  }
+  return null;
+}
+
+function decodeJwtPayload(token: string): Record<string, unknown> | null {
+  const parts = token.split(".");
+  if (parts.length < 2) return null;
+  const payload = parts[1] ?? "";
+  const padded = payload.padEnd(payload.length + ((4 - (payload.length % 4)) % 4), "=");
+  const normalized = padded.replace(/-/g, "+").replace(/_/g, "/");
+  try {
+    const decoded = Buffer.from(normalized, "base64").toString("utf8");
+    const parsed = JSON.parse(decoded) as Record<string, unknown>;
+    return parsed && typeof parsed === "object" ? parsed : null;
+  } catch {
+    return null;
+  }
+}
+
+function readStringArray(value: unknown): string[] | undefined {
+  if (!Array.isArray(value)) return undefined;
+  const out = value.map((entry) => String(entry).trim()).filter(Boolean);
+  return out.length > 0 ? out : undefined;
+}
+
+function readScopes(value: unknown): string[] | undefined {
+  if (typeof value !== "string") return undefined;
+  const out = value.split(/\s+/).map((entry) => entry.trim()).filter(Boolean);
+  return out.length > 0 ? out : undefined;
+}
+
 export async function probeMSTeams(cfg?: MSTeamsConfig): Promise<ProbeMSTeamsResult> {
   const creds = resolveMSTeamsCredentials(cfg);
   if (!creds) {
@@ -22,7 +66,29 @@ export async function probeMSTeams(cfg?: MSTeamsConfig): Promise<ProbeMSTeamsRes
     const { sdk, authConfig } = await loadMSTeamsSdkWithAuth(creds);
     const tokenProvider = new sdk.MsalTokenProvider(authConfig);
     await tokenProvider.getAccessToken("https://api.botframework.com/.default");
-    return { ok: true, appId: creds.appId };
+    let graph:
+      | {
+          ok: boolean;
+          error?: string;
+          roles?: string[];
+          scopes?: string[];
+        }
+      | undefined;
+    try {
+      const graphToken = await tokenProvider.getAccessToken(
+        "https://graph.microsoft.com/.default",
+      );
+      const accessToken = readAccessToken(graphToken);
+      const payload = accessToken ? decodeJwtPayload(accessToken) : null;
+      graph = {
+        ok: true,
+        roles: readStringArray(payload?.roles),
+        scopes: readScopes(payload?.scp),
+      };
+    } catch (err) {
+      graph = { ok: false, error: formatUnknownError(err) };
+    }
+    return { ok: true, appId: creds.appId, ...(graph ? { graph } : {}) };
   } catch (err) {
     return {
       ok: false,