http_auhtorized_get_post.dart

import 'dart:convert';
import 'dart:io';
import 'package:flutter/cupertino.dart';
import 'package:http/http.dart' as http;
import 'package:jobsolution/src/logics/service/lecture_note/lecture_note_api_service.dart';
import 'package:shared_preferences/shared_preferences.dart';

/****************
 *
 * MENU
 * 01. Constants
 * 02. sendGetReqWithAuth
 * 03. MAuthorizedResponse Class
 * 04. refreshToken
 * 05. sendPostReqWithAuth
 */

// constants
final String successStr = 'success';
final String notLoggedInStr = 'You are not logged in';
final String noInternet = 'No Internet!';


// sendGetReqWithAuth
Future<MAuthorizedResponse> sendGetReqWithAuth(String url, {expectedStatusCode = 200}) async{
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String accessT = prefs.get("key");

    // await prefs.setString("key", "oops");
    // print(accessT);
    // return null;

    http.Response response;
    if(accessT == null) return MAuthorizedResponse(false, notLoggedInStr, 401, null);


    print("Sending request in : $url");
    // first trial
    try{
        response = await http.get(Uri.parse(url), headers: {'Authorization': 'Bearer $accessT'});
    }catch (e){
        print('First Trial Error');
        print(e);
        return MAuthorizedResponse(false, noInternet, null, null);
    }

    print('First Trial Response');
    print(response.statusCode);
    print(response.body);

    // if request success
    if(response.statusCode == expectedStatusCode){
        print('First Trial Success');
        final data = json.decode(utf8.decode(response.bodyBytes));
        return MAuthorizedResponse(true, null, response.statusCode, data);
    }

    // if still not success refresh token
    bool isRefreshSuccess = await refreshToken();
    if(isRefreshSuccess){
        // start second trial
        accessT = prefs.get("key");
        print("access key $accessT");
        try{
            response = await http.get(Uri.parse(url), headers: {'Authorization': 'Bearer $accessT'});
        }catch (e){
            print('second Trial Error');
            print(e);
            return MAuthorizedResponse(false, noInternet, null, null);
        }
        print('Second Trial Response');
        print(response.statusCode);
        print(response.body);


        // if second request success
        if(response.statusCode == expectedStatusCode){
            print('Second Trial Success');
            final data = json.decode(utf8.decode(response.bodyBytes));
            return MAuthorizedResponse(true, null, response.statusCode, data);
        }

    }else{
        //token refresh failed probably not logged in
        return MAuthorizedResponse(false, notLoggedInStr, 401, null);
    }

    print('http authorized request end');
    return MAuthorizedResponse(false, notLoggedInStr, 401, null);
}

// MAuthorizedResponse
class MAuthorizedResponse{
    bool success;
    String message;
    int httpResponseStatusCode;
    dynamic httpResponseBody;

    MAuthorizedResponse(this.success, this.message, this.httpResponseStatusCode, this.httpResponseBody);
}

// refreshToken
Future<bool> refreshToken() async{
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String refreshT = prefs.get("Rkey");
    if (refreshT == null) return false;
    http.Response response;
    try{
        print("refreshing");
        response = await http.post(Uri.parse(ApiRefreshURL), body: {
            "refresh" : "$refreshT"
        });
    }catch (e){
        print('refresh token caught error');
        print(e);
        return false;
    }

    // returning refresh (true) success only when success
    if(response.statusCode == 200){
        print('refresh success');
        final data = json.decode(response.body);
        prefs.setString("key", data['access']);
        prefs.setString("Rkey", data['refresh']);
        return true;
    }


    return false;
}


// sendPostReqWithAuth
Future<MAuthorizedResponse> sendPostReqWithAuth(String url, {@required Map postBody, expectedStatusCode = 201}) async{
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String accessT = prefs.get("key");

    // await prefs.setString("key", "oops");
    // print(accessT);
    // return null;

    http.Response response;
    if(accessT == null) return MAuthorizedResponse(false, notLoggedInStr, 401, null);


    print("Sending request in : $url");
    // first trial
    try{
        response = await http.post(Uri.parse(url), body: postBody, headers: {'Authorization': 'Bearer $accessT'});
    }catch (e){
        print('First Trial Error');
        print(e);
        return MAuthorizedResponse(false, noInternet, null, null);
    }

    print('First Trial Response');
    print(response.statusCode);
    print(response.body);

    // if request success
    if(response.statusCode == expectedStatusCode){
        print('First Trial Success');
        final data = json.decode(utf8.decode(response.bodyBytes));
        return MAuthorizedResponse(true, null, response.statusCode, data);
    }

    // if still not success refresh token
    bool isRefreshSuccess = await refreshToken();
    if(isRefreshSuccess){
        // start second trial
        accessT = prefs.get("key");
        print("access key $accessT");
        try{
            response = await http.post(Uri.parse(url), body: postBody, headers: {'Authorization': 'Bearer $accessT'});
        }catch (e){
            print('second Trial Error');
            print(e);
            return MAuthorizedResponse(false, noInternet, null, null);
        }
        print('Second Trial Response');
        print(response.statusCode);
        print(response.body);


        // if second request success
        if(response.statusCode == expectedStatusCode){
            print('Second Trial Success');
            final data = json.decode(utf8.decode(response.bodyBytes));
            return MAuthorizedResponse(true, null, response.statusCode, data);
        }

    }else{
        //token refresh failed probably not logged in
        return MAuthorizedResponse(false, notLoggedInStr, 401, null);
    }

    print('http authorized request end');
    return MAuthorizedResponse(false, notLoggedInStr, 401, null);
}