check for existing token and reuse it, instead of login

pkg/contexts/ocm/blobhandler/handlers/generic/npm/blobhandler.go

@@ -67,19 +67,34 @@ func (b *artifactHandler) StoreBlob(blob cpi.BlobAccess, _ string, _ string, _ c
 	log = log.WithValues("package", pkg.Name, "version", pkg.Version)
 	log.Debug("identified")
 
-	// use user+pass+mail from credentials to login and retrieve bearer token
+	// get credentials
 	cred := npmCredentials.GetCredentials(ctx.GetContext(), b.spec.Url, pkg.Name)
-	username := cred[npmCredentials.ATTR_USERNAME]
-	password := cred[npmCredentials.ATTR_PASSWORD]
-	email := cred[npmCredentials.ATTR_EMAIL]
-	if username == "" || password == "" || email == "" {
-		return nil, fmt.Errorf("username, password or email missing")
-	}
-	log = log.WithValues("user", username, "repo", b.spec.Url)
-	log.Debug("login")
-	token, err := login(b.spec.Url, username, password, email)
-	if err != nil {
-		return nil, err
+	if cred == nil {
+		return nil, fmt.Errorf("No credentials found for %s. Couldn't upload '%s'.", b.spec.Url, pkg.Name)
+	}
+	log.Debug("found credentials")
+
+	// check if token exists, if not login and retrieve token
+	token := cred[npmCredentials.ATTR_TOKEN]
+	if token == "" {
+		// use user+pass+mail from credentials to login and retrieve bearer token
+		username := cred[npmCredentials.ATTR_USERNAME]
+		password := cred[npmCredentials.ATTR_PASSWORD]
+		email := cred[npmCredentials.ATTR_EMAIL]
+		if username == "" || password == "" || email == "" {
+			return nil, fmt.Errorf("No credentials for %s are invalid. Username, password or email missing! Couldn't upload '%s'.", b.spec.Url, pkg.Name)
+		}
+		log = log.WithValues("user", username, "repo", b.spec.Url)
+		log.Debug("login")
+
+		// TODO: check different kinds of .npmrc content
+		token, err = login(b.spec.Url, username, password, email)
+		if err != nil {
+			return nil, err
+		}
+		cred[npmCredentials.ATTR_TOKEN] = token // Frage: @mandelsoft funktioniert das?
+	} else {
+		log.Debug("token found, skipping login")
 	}
 
 	// check if package exists