118 lines
3.6 KiB
Dart
118 lines
3.6 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:http/http.dart' as http;
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class Client {
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final JsonDecoder _decoder = new JsonDecoder();
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final JsonEncoder _encoder = new JsonEncoder();
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final String _token;
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final String _base;
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int _maxPages;
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int get maxPages => _maxPages;
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String get base => _base;
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Client(this._token, String base)
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: _base = base.endsWith('/api/v1') ? base : '$base/api/v1';
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bool operator ==(dynamic otherClient) {
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return otherClient._token == _token;
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}
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@override
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int get hashCode => _token.hashCode;
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get _headers => {
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'Authorization': _token != null ? 'Bearer $_token' : '',
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'Content-Type': 'application/json'
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};
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Future<dynamic> get(String url, [Map<String, List<String>> queryParameters]) {
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// TODO: This could be moved to a seperate function
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var uri = Uri.parse('${this.base}$url');
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// Because these are all final values, we can't just add the queryParameters and must instead build a new Uri Object every time this method is called.
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var newUri = Uri(
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scheme: uri.scheme,
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userInfo: uri.userInfo,
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host: uri.host,
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port: uri.port,
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path: uri.path,
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query: uri.query,
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queryParameters: queryParameters,
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// Because dart takes a Map<String, String> here, it is only possible to sort by one parameter while the api supports n parameters.
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fragment: uri.fragment);
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return http.get(newUri, headers: _headers).then(_handleResponse);
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}
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Future<dynamic> delete(String url) {
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return http
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.delete('${this.base}$url', headers: _headers)
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.then(_handleResponse);
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}
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Future<dynamic> post(String url, {dynamic body}) {
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return http
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.post('${this.base}$url',
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headers: _headers, body: _encoder.convert(body))
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.then(_handleResponse);
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}
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Future<dynamic> put(String url, {dynamic body}) {
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return http
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.put('${this.base}$url',
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headers: _headers, body: _encoder.convert(body))
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.then(_handleResponse);
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}
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dynamic _handleResponse(http.Response response) {
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if (response.statusCode < 200 ||
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response.statusCode >= 400 ||
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json == null) {
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if (response.statusCode ~/ 100 == 4) {
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Map<String, dynamic> error = _decoder.convert(response.body);
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throw new InvalidRequestApiException(
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response.statusCode,
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response.request.url.toString(),
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error["message"] ?? "Unknown Error");
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}
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throw new ApiException(
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response.statusCode, response.request.url.toString());
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}
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// FIXME: This is a workaround for when the client makes another
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// unrelated api request in between requesting multiple pages of the same thing.
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// To properly fix this, we need a way to pass the max number of pages somewhere else
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// and not save them in the global client which everyone uses.
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// This workaround only works when the other api requests in between two pages
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// are not using pagination.
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if (response.headers["x-pagination-total-pages"] != null) {
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_maxPages = int.parse(response.headers["x-pagination-total-pages"]);
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}
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return _decoder.convert(response.body);
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}
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}
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class InvalidRequestApiException extends ApiException {
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final String message;
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InvalidRequestApiException(int errorCode, String path, this.message)
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: super(errorCode, path);
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@override
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String toString() {
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return this.message;
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}
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}
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class ApiException implements Exception {
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final int errorCode;
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final String path;
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ApiException(this.errorCode, this.path);
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@override
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String toString() {
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return "Can't fetch data from server. (Error-Code: $errorCode)";
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}
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}
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