Basic validation for ASP. NET Vnext Middleware

Overview

Vnext there is no web. config to configure Basic authentication, this article uses middleware to implement basic validation

Realize

Adding middleware through Startup (startup Class) Configure method

   Public void Configure (Iapplicationbuilder app, Ihostingenvironment env, iloggerfactory loggerfactory)        {            app. Usemymiddleware ();

// registering middleware    through extensions  Public Static class basicauthenticationextensions        {        publicstatic iapplicationbuilder usemymiddleware ( This Iapplicationbuilder app)            {            return app. Usemiddleware<basicauthentication>();            }        }

  //Middleware Class     Public classbasicauthentication {Private ReadOnlyrequestdelegate Next;  Publicbasicauthentication (requestdelegate next) { This. Next =Next; }         Public AsyncTask Invoke (HttpContext context, Iauthenticationservice AuthenticationService) {            Try                {                varParser =NewBasicauthenticationparser (context); varUsername =parser.                GetUserName (); varPassword =parser.                GetPassword (); awaitauthenticationservice.authenticateasync (username, password); awaitNext (context); }            Catch(Exception e) {context. Response.statuscode=401; Context. RESPONSE.HEADERS.ADD ("www-authenticate",                    New[] {"Basic" }); }            }        }

 //Parse context get password user name    Internal classBasicauthenticationparser {Private ReadOnly stringcredentials;  PublicBasicauthenticationparser (HttpContext context) {credentials=getcredentials (context); }         Public stringGetUserName () {returnGetValue (Credentials,0); }         Public stringGetPassword () {returnGetValue (Credentials,1); }        Private Static stringGetValue (stringCredentialsintindex) {            if(string. Isnullorwhitespace (credentials))return NULL; varParts = credentials. Split (':'); returnParts. Length = =2? Parts[index]:NULL; }        Private Static stringGetcredentials (HttpContext context) {Try                {                string[] authheader; if(Context. Request.Headers.TryGetValue ("Authorization", outAuthheader) &&Authheader.any ()&&authheader[0]. StartsWith ("Basic"))                    {                    varValue = convert.frombase64string (authheader[0]. Split (' ')[1]); returnEncoding.UTF8.GetString (value); }                return NULL; }            Catch                {                return NULL; }            }        }

 //Authentication Service Interface     Public InterfaceIauthenticationservice {Task Authenticateasync (stringUsernamestringpassword); }     Public classSimpleauthenticationservice:iauthenticationservice { PublicTask Authenticateasync (stringUsernamestringpassword) {            //Interpreting Passwords            if("123". Equals (username, stringcomparison.ordinalignorecase) &&"123". Equals (password)) {returnTask.fromresult (0); }            Throw NewException (); }        }

Run effect

Basic validation for ASP. NET Vnext Middleware