Handling Expired Token From Api in Angular 4 -


i need in handling expired token in angular application. api has expired time problem when forgot log out of angular application, after time, still can access homepage without data. there can this? there libraries can handle this? or there install? better, if nothing installed. here's authentication code below? can add can handle expiration , won't able access homepage if expires.

auth.service.ts

 export class authservice {   private loggedin = false;    constructor(private httpclient: httpclient) {   }    signinuser(email: string, password: string) {       const headers = new httpheaders()      .set('content-type', 'application/json');      return this.httpclient     .post(       'http://sample.com/login',         json.stringify({ email, password }),         { headers: headers }     )     .map(         (response: any) => {           localstorage.setitem('auth_token', response.token);           this.loggedin = true;           return response;         });    }      isloggedin() {       if (localstorage.getitem('auth_token')) {         return this.loggedin = true;       }     }     logout() {      localstorage.removeitem('auth_token');      this.loggedin = false;     } }

authguard.ts

@injectable() export class authguard implements canactivate {    constructor(private router: router, private authservice: authservice) {}    canactivate(route: activatedroutesnapshot, state: routerstatesnapshot) {      if (this.authservice.isloggedin()) {       // logged in return true       return true;     }      else {       // not logged in redirect login page return url       this.router.navigate(['signin'])       return false;       }   } }

i think there 2 solution can play with.

the first one can call logout function when browser getting closed like:

  @hostlistener('window:unload', ['$event'])   handleunload(event) {     this.auth.logout();   }

https://developer.mozilla.org/de/docs/web/events/unload

or

 @hostlistener('window:beforeunload', ['$event'])       public handlebeforeunload(event) {         this.auth.logout();       }

https://developer.mozilla.org/de/docs/web/events/beforeunload

this way alway when browser getting closed this.auth.logout(); called automatically.

second can install library angular2-jwt can detect if token has expired

jwthelper: jwthelper = new jwthelper();  usejwthelper() {   var token = localstorage.getitem('token');    console.log(     this.jwthelper.decodetoken(token),     this.jwthelper.gettokenexpirationdate(token),     this.jwthelper.istokenexpired(token)   ); }

Comments

Post a Comment

Popular posts from this blog

Sort a complex associative array in PHP -

this question has answer here: php sort array subarray value 5 answers i have associative array in php like: $newarray1 = array ( [producta] => array ( [link] => http://sanjosespartan.com/blog/products/agile-java-development/ [visitcount] => 4 ) [productd] => array ( [link] => http://sanjosespartan.com/blog/products/intro-to-go/ [visitcount] => 1 ) [productg] => array ( [link] => http://sanjosespartan.com/blog/products/node-js-for-developers/ [visitcount] => 1 ) [productb] => array ( [link] => http://sanjosespartan.com/blog/products/beginning-mysql/ [visitcount] => 1 ) [productc] => array ( [link] => http://sanjosespartan.com/blog/products/computer-networks/ [visitcount] => 1 ) ...
Read more

vb.net - How to ignore if a cell is empty nothing -

how use roscolor() ignore value (like empty cell) ? color row if value upper 5 when there nothing in cell, want ignore roscolor() apply, how? public sub roscolor() integer = 0 quotedatagridview1.rows.count() - 1 step +1 dim val integer val = quotedatagridview1.rows(i).cells(3).value if val = vbempty quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.white elseif val < 5 quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.red elseif val > 5 , val < 10 quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.lightyellow end if next end sub you can check empty value following public sub roscolor() integer = 0 quotedatagridview1.rows.count() - 1 step +1 dim val = quotedatagridview1.rows(i).cells(3).value if isdbnull(val) or val nothing quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.white ...
Read more

recursion - Can every recursive algorithm be improved with dynamic programming? -

i first year undergraduate csc student looking competitive programming. recursion involves defining , solving sub problems. understand, top down dynamic programming (dp) involves memoizing solutions sub problems reduce time complexity of algorithm. can top down dp used improve efficiency of every recursive algorithm overlapping sub problems? dp fail work , how can identify this? the short answer is: yes. however, there constraints. obvious 1 recursive calls must overlap. i.e. during execution of algorithm, recursive function must called multiple times same parameters. lets truncate recursion tree memoization. can use memoization reduce number of calls. however, reduction of calls comes price. need store results somewhere. next obvious constraint need have enough memory. comes not-so obvious constraint. memory access requires time. first need find result stored , maybe copy location. in cases, might faster let recursion calculate result instead of loading somewher...
Read more