Set attachment limit from instance

app/soapbox/actions/compose.js

@@ -296,8 +296,7 @@ export function submitComposeFail(error) {
 export function uploadCompose(files) {
   return function(dispatch, getState) {
     if (!isLoggedIn(getState)) return;
-    const instance = getState().get('instance');
-    const { attachmentLimit } = getFeatures(instance);
+    const attachmentLimit = getState().getIn(['instance', 'configuration', 'statuses', 'max_media_attachments']);
 
     const media  = getState().getIn(['compose', 'media_attachments']);
     const progress = new Array(files.length).fill(0);

app/soapbox/reducers/__tests__/instance-test.js

@@ -11,6 +11,7 @@ describe('instance reducer', () => {
       configuration: ImmutableMap({
         statuses: ImmutableMap({
           max_characters: 500,
+          max_media_attachments: 4,
         }),
         polls: ImmutableMap({
           max_options: 4,
@@ -36,6 +37,7 @@ describe('instance reducer', () => {
         configuration: {
           statuses: {
             max_characters: 5000,
+            max_media_attachments: Infinity,
           },
           polls: {
             max_options: 20,
@@ -95,6 +97,7 @@ describe('instance reducer', () => {
         configuration: {
           statuses: {
             max_characters: 500,
+            max_media_attachments: 4,
           },
           polls: {
             max_options: 4,

app/soapbox/reducers/instance.js

@@ -4,6 +4,8 @@ import { ADMIN_CONFIG_UPDATE_REQUEST, ADMIN_CONFIG_UPDATE_SUCCESS } from 'soapbo
 import { PLEROMA_PRELOAD_IMPORT } from 'soapbox/actions/preload';
 import KVStore from 'soapbox/storage/kv_store';
 import { ConfigDB } from 'soapbox/utils/config_db';
+import { parseVersion, PLEROMA } from 'soapbox/utils/features';
+import { isNumber } from 'soapbox/utils/numbers';
 
 import {
   INSTANCE_REMEMBER_SUCCESS,
@@ -34,6 +36,7 @@ const initialState = ImmutableMap({
   configuration: ImmutableMap({
     statuses: ImmutableMap({
       max_characters: 500,
+      max_media_attachments: 4,
     }),
     polls: ImmutableMap({
       max_options: 4,
@@ -63,8 +66,12 @@ const pleromaToMastodonConfig = instance => {
 // Use new value only if old value is undefined
 const mergeDefined = (oldVal, newVal) => oldVal === undefined ? newVal : oldVal;
 
+// Get the software's default attachment limit
+const getAttachmentLimit = software => software === PLEROMA ? Infinity : 4;
+
 // Normalize instance (Pleroma, Mastodon, etc.) to Mastodon's format
 const normalizeInstance = instance => {
+  const { software } = parseVersion(instance.get('version'));
   const mastodonConfig = pleromaToMastodonConfig(instance);
 
   return instance.withMutations(instance => {
@@ -73,6 +80,11 @@ const normalizeInstance = instance => {
       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 & cleanup
     instance.mergeDeepWith(mergeDefined, initialState);
     instance.deleteAll(['max_toot_chars', 'poll_limits']);

app/soapbox/utils/__tests__/features-test.js

@@ -94,22 +94,6 @@ describe('getFeatures', () => {
     });
   });
 
-  describe('attachmentLimit', () => {
-    it('is 4 by default', () => {
-      const instance = ImmutableMap({ version: '3.1.4' });
-      const features = getFeatures(instance);
-      expect(features.attachmentLimit).toEqual(4);
-    });
-
-    it('is Infinity for Pleroma', () => {
-      const instance = ImmutableMap({
-        version: '2.7.2 (compatible; Pleroma 1.1.50-42-g3d9ac6ae-develop)',
-      });
-      const features = getFeatures(instance);
-      expect(features.attachmentLimit).toEqual(Infinity);
-    });
-  });
-
   describe('focalPoint', () => {
     it('is true for Mastodon 2.3.0+', () => {
       const instance = ImmutableMap({ version: '2.3.0' });

app/soapbox/utils/features.js

@@ -49,7 +49,6 @@ export const getFeatures = createSelector([
     ]),
     emojiReacts: v.software === PLEROMA && gte(v.version, '2.0.0'),
     emojiReactsRGI: v.software === PLEROMA && gte(v.version, '2.2.49'),
-    attachmentLimit: v.software === PLEROMA ? Infinity : 4,
     focalPoint: v.software === MASTODON && gte(v.compatVersion, '2.3.0'),
     importAPI: v.software === PLEROMA,
     importMutes: v.software === PLEROMA && gte(v.version, '2.2.0'),