Log gameplay to BGG example

bgglog.dart

import 'dart:convert';
import 'package:http/http.dart' as http;

const BGGLOGIN_URL = 'https://boardgamegeek.com/login/api/v1';
const BGGUPLOAD_URL = 'https://boardgamegeek.com/geekplay.php';

enum UploadResult {
  Success,
  UsernamePassword,
  NetworkError,
  ServerError,
}

Future<UploadResult> uploadToBgg(
  String username,
  String password,
  Game game,
  List<PlayerWorth> result,
  String location,
) async {
  try {
    // login into BGG
    final loginResponse = await http.post(
      BGGLOGIN_URL,
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode(
        {
          'credentials': {
            'username': username,
            'password': password,
          },
        },
      ),
    );
    if (loginResponse.statusCode == 400) return UploadResult.UsernamePassword;

    // setup session cookie
    // "bggusername=USERNAME; bggpassword=PASSWORDHASH; SessionID=SESSIONID;"
    String sessionCookie = '';
    for (final cookie in loginResponse.headers['set-cookie'].split(';')) {
      if (cookie.startsWith('bggusername')) {
        sessionCookie += (cookie.length > 0 ? ' ' : '') + cookie + ';';
        continue;
      }
      var idx = cookie.indexOf('bggpassword=');
      if (idx != -1) {
        sessionCookie += (cookie.length > 0 ? ' ' : '') +
            'bggpassword=' +
            cookie.substring(idx + 12) +
            ';';
        continue;
      }
      idx = cookie.indexOf('SessionID=');
      if (idx != -1) {
        sessionCookie += (cookie.length > 0 ? ' ' : '') +
            'SessionID=' +
            cookie.substring(idx + 10) +
            ';';
        continue;
      }
    }

    // setup body
    final gameResultBody = {..._kGameResultBodyTemplate};
    gameResultBody['objectid'] = game.bggId;
    final now = new DateTime.now();
    gameResultBody['playdate'] =
        '${now.year}-${now.month.toString().padLeft(2, '0')}-${now.day.toString().padLeft(2, '0')}';
    gameResultBody['date'] = now.toIso8601String();
    gameResultBody['location'] = location;

    final gameResult = [...result];
    gameResult.sort((a, b) => b.worth - a.worth);

    // setup results
    final playersResult = [];
    var winningScore;
    for (var i = 0; i < gameResult.length; i++) {
      final playerResult = gameResult[i];
      if (winningScore == null) {
        winningScore = playerResult.worth;
      }
      playersResult.add({
        'name': playerResult.player.name,
        'username': playerResult.player.bggUsername,
        'score': playerResult.worth,
        'win': playerResult.worth == winningScore ? true : null,
      });
    }
    gameResultBody['players'] = playersResult;

    final uploadResponse = await http.post(
      BGGUPLOAD_URL,
      headers: {
        'cookie': sessionCookie,
        'Content-Type': 'application/json;charset=UTF-8',
      },
      body: jsonEncode(gameResultBody),
    );

    if (uploadResponse.statusCode >= 500) return UploadResult.ServerError;
    if (uploadResponse.statusCode >= 400) return UploadResult.NetworkError;
    return UploadResult.Success;
  } catch (e) {
    return UploadResult.ServerError;
  }
}

const _kGameResultBodyTemplate = {
  'ajax': 1,
  'objecttype': 'thing',
  'action': 'save',
  'quantity': 1,
  'length': 0,
};

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