Mercurial > gemma
view pkg/middleware/dbconn.go @ 4906:21fea90f4002 fairway-marks-import
Avoid unnecessary pointer to pointer
author | Tom Gottfried <tom@intevation.de> |
---|---|
date | Fri, 07 Feb 2020 12:35:11 +0100 |
parents | 6f9d00c8cc38 |
children | 5f47eeea988d |
line wrap: on
line source
// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2019 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package middleware import ( "context" "database/sql" "fmt" "log" "net/http" "gemma.intevation.de/gemma/pkg/auth" ) type wrapDBKeyType int const wrapDBKey wrapDBKeyType = 0 // GetDBConn fetches a *sql.Conn from the context of the request. // Returns nil if no such connection exists. func GetDBConn(req *http.Request) *sql.Conn { if conn, ok := req.Context().Value(wrapDBKey).(*sql.Conn); ok { return conn } return nil } // DBConn is a middleware that stores a *sql.Conn in the context // of the incoming request if the user is authorized and // has a valid session. // The handler will return with an http.StatusUnauthorized else // w/o calling the cascaded next handler. func DBConn(next http.Handler) http.Handler { return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { token, ok := auth.GetToken(req) if !ok { http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized) return } session := auth.Sessions.Session(token) if session == nil { http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized) return } parent := req.Context() if err := auth.RunAs(parent, session.User, func(conn *sql.Conn) error { ctx := context.WithValue(parent, wrapDBKey, conn) req = req.WithContext(ctx) next.ServeHTTP(rw, req) return nil }); err != nil { log.Printf("error: %v\n", err) http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusInternalServerError) } }) }