Return nicer erorr messages if a token or a profile already exist

internal/controlplane/handlers_oauth.go

@@ -418,7 +418,9 @@ func (s *Server) StoreProviderToken(ctx context.Context,
 	_, err = s.store.CreateAccessToken(ctx, db.CreateAccessTokenParams{ProjectID: projectID, Provider: provider.Name,
 		EncryptedToken: encodedToken, OwnerFilter: owner})
 
-	if err != nil {
+	if db.ErrIsUniqueViolation(err) {
+		return nil, util.UserVisibleError(codes.AlreadyExists, "token already exists")
+	} else if err != nil {
 		return nil, status.Errorf(codes.Internal, "error storing access token: %v", err)
 	}
 	return &pb.StoreProviderTokenResponse{}, nil

internal/controlplane/handlers_profile.go

@@ -212,7 +212,10 @@ func (s *Server) CreateProfile(ctx context.Context,
 
 	// Create profile
 	profile, err := qtx.CreateProfile(ctx, params)
-	if err != nil {
+	if db.ErrIsUniqueViolation(err) {
+		log.Printf("profile already exists: %v", err)
+		return nil, util.UserVisibleError(codes.AlreadyExists, "profile already exists")
+	} else if err != nil {
 		log.Printf("error creating profile: %v", err)
 		return nil, status.Errorf(codes.Internal, "error creating profile")
 	}

internal/db/errors.go

@@ -0,0 +1,34 @@
+// Copyright 2023 Stacklok, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package db
+
+import (
+	"errors"
+
+	"github.com/lib/pq"
+)
+
+// ErrIsUniqueViolation returns true if the error is a unique violation
+func ErrIsUniqueViolation(err error) bool {
+	return isPostgresError(err, "23505")
+}
+
+func isPostgresError(err error, code string) bool {
+	var pgErr *pq.Error
+	if errors.As(err, &pgErr) {
+		return pgErr.Code == pq.ErrorCode(code)
+	}
+	return false
+}