Convert Instance normalizer into TypeScript

app/soapbox/normalizers/instance.ts

@@ -0,0 +1,101 @@
+import {
+  Map as ImmutableMap,
+  List as ImmutableList,
+  Record as ImmutableRecord,
+} from 'immutable';
+
+import { parseVersion, PLEROMA } from 'soapbox/utils/features';
+import { mergeDefined } from 'soapbox/utils/normalizers';
+import { isNumber } from 'soapbox/utils/numbers';
+
+// Use Mastodon defaults
+const InstanceRecord = ImmutableRecord({
+  approval_required: false,
+  contact_account: ImmutableMap(),
+  configuration: ImmutableMap({
+    media_attachments: ImmutableMap(),
+    polls: ImmutableMap({
+      max_options: 4,
+      max_characters_per_option: 25,
+      min_expiration: 300,
+      max_expiration: 2629746,
+    }),
+    statuses: ImmutableMap({
+      max_characters: 500,
+      max_media_attachments: 4,
+    }),
+  }),
+  description: '',
+  description_limit: 1500,
+  email: '',
+  fedibird_capabilities: ImmutableList(),
+  invites_enabled: false,
+  languages: ImmutableList(),
+  pleroma: ImmutableMap({
+    metadata: ImmutableMap({
+      account_activation_required: false,
+      birthday_min_age: 0,
+      birthday_required: false,
+      features: ImmutableList(),
+      federation: ImmutableMap({
+        enabled: true,
+        exclusions: false,
+      }),
+    }),
+    stats: ImmutableMap(),
+  }),
+  registrations: false,
+  rules: ImmutableList(),
+  short_description: '',
+  stats: ImmutableMap({
+    domain_count: 0,
+    status_count: 0,
+    user_count: 0,
+  }),
+  title: '',
+  thumbnail: '',
+  uri: '',
+  urls: ImmutableMap(),
+  version: '0.0.0',
+});
+
+// Build Mastodon configuration from Pleroma instance
+const pleromaToMastodonConfig = (instance: ImmutableMap<string, any>) => {
+  return ImmutableMap({
+    statuses: ImmutableMap({
+      max_characters: instance.get('max_toot_chars'),
+    }),
+    polls: ImmutableMap({
+      max_options: instance.getIn(['poll_limits', 'max_options']),
+      max_characters_per_option: instance.getIn(['poll_limits', 'max_option_chars']),
+      min_expiration: instance.getIn(['poll_limits', 'min_expiration']),
+      max_expiration: instance.getIn(['poll_limits', 'max_expiration']),
+    }),
+  });
+};
+
+// Get the software's default attachment limit
+const getAttachmentLimit = (software: string) => software === PLEROMA ? Infinity : 4;
+
+// Normalize instance (Pleroma, Mastodon, etc.) to Mastodon's format
+export const normalizeInstance = (instance: ImmutableMap<string, any>) => {
+  const { software } = parseVersion(instance.get('version'));
+  const mastodonConfig = pleromaToMastodonConfig(instance);
+
+  return InstanceRecord(
+    instance.withMutations(instance => {
+      // Merge configuration
+      instance.update('configuration', ImmutableMap(), configuration => (
+        configuration.mergeDeepWith(mergeDefined, mastodonConfig)
+      ));
+
+      // If max attachments isn't set, check the backend software
+      instance.updateIn(['configuration', 'statuses', 'max_media_attachments'], value => {
+        return isNumber(value) ? value : getAttachmentLimit(software);
+      });
+
+      // Merge defaults
+      instance.mergeDeepWith(mergeDefined, InstanceRecord());
+    }),
+  );
+};