Added utils to connect to server.
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import 'package:http/http.dart';
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import 'package:logger/logger.dart';
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import 'dart:convert';
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final log = Logger();
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class Connection {
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// Connection constructor.
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Connection(this.username, this.password, this.baseAddress);
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// baseAddress contains the base address to the BotZ server
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// assuming that the APIs are located at /api/.
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final String baseAddress;
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// Username is the username to autenticate against the foreign
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// service.
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final String username;
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// Password is the password to autenticate against the foreign
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// service.
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final String password;
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// _stateCookie is private. It contains the HTTP state cookie
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// assigned by the server.
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String _stateCookie = "";
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bool _loggedIn = false;
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void login() async {
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// TODO: perform the login and obtain the cookie. Set the
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// _loggedIn state accordingly.
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}
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void logout() async {
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// TODO: perform the logout. If successful, empty the _stateCookie
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// and set the _loggedIn state accordingly.
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}
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void checkin() async {
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// TODO: perform the checkin if possible.
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}
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void checkout() async {
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// TODO: perform the checkout if possible.
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}
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Future<Map<String, dynamic>> getMovements() async {
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// TODO: query /api/movements and retrieve the list of movements.
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return {};
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}
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}
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class UnauthorizedException implements ClientException {
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UnauthorizedException(this.uri);
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final String message = "Unauthorized";
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final Uri uri;
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}
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Response handleResponse(Response resp) {
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final c = resp.statusCode;
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if (c >= 200 && c < 400) {
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} else if (c == 401) {
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throw UnauthorizedException(resp.request.url);
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} else if (c >=400 || c < 500) {
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throw ClientException("Unexpected return code: $c", resp.request.url);
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} else if (c >= 500) {
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throw ClientException("Server error: $c", resp.request.url);
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}
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return resp;
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}
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class BotZContent {
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BotZContent(this.response) {
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this.response.then((resp) => handleResponse(resp))
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.then((value) => this.initContent(value))
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.catchError((err) => log.e(err));
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}
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final Future<Response> response;
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Map<String, dynamic> body;
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List<String> cookies;
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void initContent(Response resp) {
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this.cookies = resp.headers['cookies'].split(';');
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this.body = jsonDecode(resp.body);
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}
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}
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189
lib/utils/connection.dart
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189
lib/utils/connection.dart
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import 'package:http/http.dart';
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import 'package:logger/logger.dart';
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import 'dart:convert';
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final log = Logger();
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const defaultRoutes = {
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"login": "/api/login",
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"logout": "/api/logout",
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"checkin": "/api/checkin",
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"checkout": "/api/checkout",
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"movements": "/api/movements",
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"status": "/api/status",
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"ping": "/api/ping",
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};
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class Connection {
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// Connection constructor.
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Connection(this.username, this.password, this.baseAddress, [this.routes = defaultRoutes]);
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// baseAddress contains the base address to the BotZ server
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final Uri baseAddress;
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// Username is the username to autenticate against the foreign
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// service.
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final String username;
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// Password is the password to autenticate against the foreign
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// service.
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final String password;
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final Map<String, String> routes;
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// _stateCookie is private. It contains the HTTP state cookie
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// assigned by the server.
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String _cookies = "";
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bool _loggedIn = false;
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bool _checkedIn = false;
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void updateState(String cookies, bool loggedIn) {
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this._cookies = loggedIn ? cookies : "";
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this._loggedIn = loggedIn;
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}
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void updateMovement(bool checkedIn) => this._checkedIn = checkedIn;
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bool isLoggedIn() => this._loggedIn;
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bool isCheckedIn() => this._checkedIn;
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// Perform the login and obtain the cookie.
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void login() async {
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var targetUri = this.baseAddress.toString() + this.routes['login'];
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var payload = jsonEncode({
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"username": this.username,
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"password": this.password,
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});
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var resp = await post(
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targetUri,
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headers: {"Content-Type": "application/json"},
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body: payload,
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);
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log.d("[login] Post sent to: $targetUri");
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handleResponse(resp);
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var body = jsonDecode(resp.body);
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log.d("[login] Response: $body");
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this.updateState(resp.headers['cookies'], body['logged_in']);
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}
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// Perform the logout.
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void logout() async {
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var targetUri = this.baseAddress.toString() + this.routes['logout'];
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var resp = await post(
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targetUri,
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headers: {'cookies': this._cookies},
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);
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log.d("[logout] Post sent to: $targetUri");
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handleResponse(resp);
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var body = jsonDecode(resp.body);
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log.d("[logout] Response: $body");
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this.updateState(this._cookies, body['logged_in']);
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}
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// Perform the checkin if possible.
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void checkin() async {
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if (!this._loggedIn) {
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throw UnacceptableInvocationException("Not logged in");
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}
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if (this._checkedIn) {
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throw UnacceptableInvocationException("Yet checked in");
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}
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var targetUri = this.baseAddress.toString() + this.routes['checkin'];
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var resp = await post(
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targetUri,
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headers: {'cookies': this._cookies},
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);
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handleResponse(resp);
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var body = jsonDecode(resp.body);
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log.d("[checkin] Response: $body");
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this.updateMovement(body['checked_in']);
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}
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// Perform the checkout if possible.
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void checkout() async {
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if (!this._loggedIn) {
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throw UnacceptableInvocationException("Not logged in");
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}
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if (!this._checkedIn) {
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throw UnacceptableInvocationException("Not yet checked in");
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}
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var targetUri = this.baseAddress.toString() + this.routes['checkout'];
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var resp = await post(
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targetUri,
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headers: {'cookies': this._cookies},
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);
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handleResponse(resp);
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var body = jsonDecode(resp.body);
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log.d("[checkout] Response: $body");
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this.updateMovement(body['checked_in']);
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}
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// Query the server for the list of movements.
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Future<Map<String, String>> getMovements() async {
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if (!this._loggedIn) {
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throw UnacceptableInvocationException("Not logged in");
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}
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if (!this._checkedIn) {
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throw UnacceptableInvocationException("Not yet checked in");
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}
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var targetUri = this.baseAddress.toString() + this.routes['movements'];
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var resp = await get(
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targetUri,
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headers: {'cookies': this._cookies},
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);
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try {
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handleResponse(resp);
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} on NotFoundException {
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return {};
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}
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var body = jsonDecode(resp.body);
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Map<String, String> movements;
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for (var values in body['movements']) {
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movements[values['time']] = values['type'];
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}
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return movements;
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}
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}
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class UnauthorizedException implements ClientException {
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UnauthorizedException(this.uri);
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final String message = "Unauthorized";
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final Uri uri;
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}
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class NotFoundException implements ClientException {
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NotFoundException(this.uri);
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final String message = "Resource not found";
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final Uri uri;
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}
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class UnacceptableInvocationException implements Exception {
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UnacceptableInvocationException(this.message);
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final String message;
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}
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Response handleResponse(Response resp) {
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final c = resp.statusCode;
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if (c >= 200 && c < 400) {
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} else if (c == 401) {
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throw UnauthorizedException(resp.request.url);
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} else if (c == 404) {
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throw NotFoundException(resp.request.url);
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}else if (c >=400 || c < 500) {
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throw ClientException("Unexpected return code: $c", resp.request.url);
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} else if (c >= 500) {
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throw ClientException("Server error: $c", resp.request.url);
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}
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return resp;
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}
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