add join rules event

lib/models/content/canonical_alias.dart

@@ -0,0 +1,17 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/content.dart";
+part "canonical_alias.freezed.dart";
+part "canonical_alias.g.dart";
+
+@freezed
+abstract class CanonicalAliasContent extends Content
+    with _$CanonicalAliasContent {
+  CanonicalAliasContent._();
+  const factory CanonicalAliasContent({
+    String? alias,
+    @Default([]) altAliases,
+  }) = _CanonicalAliasContent;
+
+  factory CanonicalAliasContent.fromJson(Map<String, Object?> json) =>
+      _$CanonicalAliasContentFromJson(json);
+}

lib/models/content/content.dart

@@ -1,6 +1,8 @@
 import "package:collection/collection.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/canonical_alias.dart";
 import "package:nexus/models/content/create.dart";
+import "package:nexus/models/content/join_rules.dart";
 import "package:nexus/models/content/membership.dart";
 import "package:nexus/models/content/message.dart";
 
@@ -22,6 +24,8 @@ enum EventType {
   encrypted("m.room.encrypted", Content.fromJson),
   membership("m.room.member", MembershipContent.fromJson),
   create("m.room.create", CreateContent.fromJson),
+  canonicalAlias("m.room.canonical_alias", CanonicalAliasContent.fromJson),
+  joinRules("m.room.join_rules", JoinRulesContent.fromJson),
   message("m.room.message", MessageContent.fromJson);
 
   final String type;

lib/models/content/join_rules.dart

@@ -0,0 +1,34 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/content.dart";
+import "package:nexus/models/join_rule.dart";
+part "join_rules.freezed.dart";
+part "join_rules.g.dart";
+
+@freezed
+abstract class JoinRulesContent extends Content with _$JoinRulesContent {
+  JoinRulesContent._();
+  const factory JoinRulesContent({
+    required JoinRule joinRule,
+    @Default(IList.empty()) IList<AllowCondition> allow,
+  }) = _JoinRulesContent;
+
+  factory JoinRulesContent.fromJson(Map<String, Object?> json) =>
+      _$JoinRulesContentFromJson(json);
+}
+
+@freezed
+abstract class AllowCondition with _$AllowCondition {
+  const factory AllowCondition({
+    String? roomId,
+    required AllowConditionType type,
+  }) = _AllowCondition;
+
+  factory AllowCondition.fromJson(Map<String, Object?> json) =>
+      _$AllowConditionFromJson(json);
+}
+
+enum AllowConditionType {
+  @JsonValue("m.room_membership")
+  membership,
+}

lib/models/join_rule.dart

@@ -0,0 +1,4 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+
+@JsonEnum(fieldRename: FieldRename.snake)
+enum JoinRule { public, knock, invite, private, restricted, knockRestricted }