Backport support for aud list values into 0.3.x (support live-budget).

src/buffoonery/auth.nim

@@ -140,11 +140,15 @@ proc validateJWT*(ctx: ApiAuthContext, jwt: JWT) =
 
     if jwt.claims.aud.isNone: failAuth "Missing 'aud' claim."
 
-    if not ctx.validAudiences.contains(jwt.claims.aud.get):
-      log.debug(
-        "Valid audiences: $#\ttoken audience: $#" %
-        [$ctx.validAudiences, jwt.claims.aud.get])
-      failAuth "JWT is not for us (invalid audience)."
+    if jwt.claims["aud"].get.kind == JString:
+      # If the token is for a single audience, check that it is for us.
+      if not ctx.validAudiences.contains(jwt.claims.aud.get):
+        failAuth "JWT is not for us (invalid audience)."
+    elif jwt.claims["aud"].get.kind == JArray:
+      # If the token is for multiple audiences, check that at least one is for us.
+      let auds = jwt.claims["aud"].get.getElems
+      if not auds.anyIt(ctx.validAudiences.contains(it.getStr)):
+        failAuth "JWT is not for us (invalid audience)."
 
     let signingAlgorithm = jwt.header.alg.get