lemmur-app-android/lib/stores/accounts_store.dart

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import 'dart:collection';
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import 'dart:convert';
import 'package:flutter/foundation.dart';
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import 'package:json_annotation/json_annotation.dart';
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import 'package:lemmy_api_client/v3.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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part 'accounts_store.g.dart';
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/// Store that manages all accounts
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@JsonSerializable()
class AccountsStore extends ChangeNotifier {
static const prefsKey = 'v3:AccountsStore';
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static final _prefs = SharedPreferences.getInstance();
/// Map containing JWT tokens of specific users.
/// If a token is in this map, the user is considered logged in
/// for that account.
/// `tokens['instanceHost']['username']`
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@protected
@JsonKey(defaultValue: {'lemmy.ml': {}})
late Map<String, Map<String, Jwt>> tokens;
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/// default account for a given instance
/// map where keys are instanceHosts and values are usernames
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@protected
@JsonKey(defaultValue: {})
late Map<String, String> defaultAccounts;
/// default account for the app
/// It is in a form of `username@instanceHost`
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@protected
String? defaultAccount;
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static Future<AccountsStore> load() async {
final prefs = await _prefs;
return _$AccountsStoreFromJson(
jsonDecode(prefs.getString(prefsKey) ?? '{}') as Map<String, dynamic>,
);
}
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Future<void> save() async {
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final prefs = await _prefs;
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await prefs.setString(prefsKey, jsonEncode(_$AccountsStoreToJson(this)));
}
/// automatically sets default accounts
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Future<void> _assignDefaultAccounts() async {
// remove dangling defaults
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defaultAccounts.entries
.map((dft) {
final instance = dft.key;
final username = dft.value;
// if instance or username doesn't exist, remove
if (!instances.contains(instance) ||
!usernamesFor(instance).contains(username)) {
return instance;
}
})
.toList()
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.forEach(defaultAccounts.remove);
if (defaultAccount != null) {
final instance = defaultAccount!.split('@')[1];
final username = defaultAccount!.split('@')[0];
// if instance or username doesn't exist, remove
if (!instances.contains(instance) ||
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!usernamesFor(instance).contains(username)) {
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defaultAccount = null;
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}
}
// set local defaults
for (final instanceHost in instances) {
// if this instance is not in defaults
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if (!defaultAccounts.containsKey(instanceHost)) {
// select first account in this instance, if any
if (!isAnonymousFor(instanceHost)) {
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await setDefaultAccountFor(
instanceHost, usernamesFor(instanceHost).first);
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}
}
}
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// set global default
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if (defaultAccount == null) {
// select first account of first instance
for (final instanceHost in instances) {
// select first account in this instance, if any
if (!isAnonymousFor(instanceHost)) {
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await setDefaultAccount(
instanceHost, usernamesFor(instanceHost).first);
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}
}
}
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}
String? get defaultUsername {
// if (defaultAccount == null) {
// return null;
// }
return defaultAccount?.split('@')[0];
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}
String? get defaultInstanceHost {
// if (defaultAccount == null) {
// return null;
// }
return defaultAccount?.split('@')[1];
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}
String? defaultUsernameFor(String instanceHost) {
if (isAnonymousFor(instanceHost)) {
return null;
}
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return defaultAccounts[instanceHost];
}
Jwt? get defaultToken {
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if (defaultAccount == null) {
return null;
}
final userTag = defaultAccount!.split('@');
return tokens[userTag[1]]?[userTag[0]];
}
Jwt? defaultTokenFor(String instanceHost) {
if (isAnonymousFor(instanceHost)) {
return null;
}
return tokens[instanceHost]?[defaultAccounts[instanceHost]];
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}
Jwt? tokenFor(String instanceHost, String username) {
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if (!usernamesFor(instanceHost).contains(username)) {
return null;
}
return tokens[instanceHost]?[username];
}
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/// sets globally default account
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Future<void> setDefaultAccount(String instanceHost, String username) {
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defaultAccount = '$username@$instanceHost';
notifyListeners();
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return save();
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}
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/// sets default account for given instance
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Future<void> setDefaultAccountFor(String instanceHost, String username) {
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defaultAccounts[instanceHost] = username;
notifyListeners();
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return save();
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}
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/// An instance is considered anonymous if it was not
/// added or there are no accounts assigned to it.
bool isAnonymousFor(String instanceHost) {
if (!instances.contains(instanceHost)) {
return true;
}
return tokens[instanceHost]!.isEmpty;
}
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/// `true` if no added instance has an account assigned to it
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bool get hasNoAccount => loggedInInstances.isEmpty;
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Iterable<String> get instances => tokens.keys;
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Iterable<String> get loggedInInstances =>
instances.where((e) => !isAnonymousFor(e));
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/// Usernames that are assigned to a given instance
Iterable<String> usernamesFor(String instanceHost) =>
tokens[instanceHost]?.keys ?? const Iterable.empty();
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/// adds a new account
/// if it's the first account ever the account is
/// set as default for the app
/// if it's the first account for an instance the account is
/// set as default for that instance
Future<void> addAccount(
String instanceHost,
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String usernameOrEmail,
String password,
) async {
if (!instances.contains(instanceHost)) {
throw Exception('No such instance was added');
}
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final lemmy = LemmyApiV3(instanceHost);
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final token = await lemmy.run(Login(
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usernameOrEmail: usernameOrEmail,
password: password,
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));
final userData = await lemmy
.run(GetSite(auth: token.raw))
.then((value) => value.myUser!);
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tokens[instanceHost]![userData.person.name] = token.copyWith(
payload: token.payload.copyWith(sub: userData.person.id),
);
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await _assignDefaultAccounts();
notifyListeners();
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return save();
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}
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/// adds a new instance with no accounts associated with it.
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/// Additionally makes a test `GET /site` request to check if the instance exists.
/// Check is skipped when [assumeValid] is `true`
Future<void> addInstance(
String instanceHost, {
bool assumeValid = false,
}) async {
if (instances.contains(instanceHost)) {
throw Exception('This instance has already been added');
}
if (!assumeValid) {
try {
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await LemmyApiV3(instanceHost).run(const GetSite());
// ignore: avoid_catches_without_on_clauses
} catch (_) {
throw Exception('This instance seems to not exist');
}
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}
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tokens[instanceHost] = HashMap();
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await _assignDefaultAccounts();
notifyListeners();
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return save();
}
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/// This also removes all accounts assigned to this instance
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Future<void> removeInstance(String instanceHost) async {
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tokens.remove(instanceHost);
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await _assignDefaultAccounts();
notifyListeners();
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return save();
}
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Future<void> removeAccount(String instanceHost, String username) async {
if (!tokens.containsKey(instanceHost)) {
throw Exception("instance doesn't exist");
}
tokens[instanceHost]!.remove(username);
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await _assignDefaultAccounts();
notifyListeners();
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return save();
}
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}