Nexus/nexus
Nexus/nexus
3
2
Fork 4
Code Issues 4 Pull requests Projects Releases Packages Wiki Activity

Add server-generated URL preview support

Browse source
This commit is contained in:
Henry Hiles 2026-04-03 19:39:39 -04:00
commit f4624c2866
Signed by: Henry-Hiles
SSH key fingerprint: SHA256:VKQUdS31Q90KvX7EkKMHMBpUspcmItAh86a+v7PGiIs
5 changed files with 128 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

63
lib/controllers/url_preview_controller.dart Normal file
View file

@ -0,0 +1,63 @@
import "dart:convert";
import "package:flutter_chat_core/flutter_chat_core.dart";
import "package:flutter_riverpod/flutter_riverpod.dart";
import "package:http/http.dart";
import "package:nexus/controllers/client_state_controller.dart";
import "package:nexus/controllers/header_controller.dart";
import "package:nexus/helpers/extensions/mxc_to_https.dart";
class UrlPreviewController extends AsyncNotifier<LinkPreviewData?> {
final TextMessage message;
UrlPreviewController(this.message);
@override
Future<LinkPreviewData?> build() async {
final homeserver = ref.watch(ClientStateController.provider)?.homeserverUrl;
final link = RegExp(
r'''https?://[^\s"'<>]+''',
).allMatches(message.text).firstOrNull?.group(0);
if (homeserver != null && link != null) {
{
final response = await get(
Uri.parse(homeserver)
.resolve("/_matrix/client/v1/media/preview_url")
.replace(queryParameters: {"url": link}),
headers: await ref.watch(HeaderController.provider.future),
);
if (response.statusCode == 200) {
final decodedValue = json.decode(response.body);
final mxc = decodedValue["og:image"];
final image = mxc == null
? null
: Uri.tryParse(mxc)?.mxcToHttps(homeserver);
return LinkPreviewData(
link: link,
title: decodedValue["og:title"],
description: decodedValue["og:description"],
image: image == null
? null
: ImagePreviewData(
url: image.toString(),
width:
(decodedValue["og:image:width"] as int?)?.toDouble() ??
0,
height:
(decodedValue["og:image:height"] as int?)?.toDouble() ??
0,
),
);
}
}
}
return null;
}
static final provider = AsyncNotifierProvider.autoDispose
.family<UrlPreviewController, LinkPreviewData?, TextMessage>(
UrlPreviewController.new,
);
}

58
lib/widgets/chat_page/wrappers/text_message_wrapper.dart
View file

@ -1,11 +1,17 @@
import "package:cross_cache/cross_cache.dart";
import "package:flutter/material.dart";
import "package:flutter_chat_core/flutter_chat_core.dart";
import "package:flutter_link_previewer/flutter_link_previewer.dart";
import "package:flutter_riverpod/flutter_riverpod.dart";
import "package:nexus/controllers/cross_cache_controller.dart";
import "package:nexus/controllers/url_preview_controller.dart";
import "package:nexus/helpers/extensions/better_when.dart";
import "package:nexus/helpers/extensions/get_headers.dart";
import "package:nexus/widgets/chat_page/html/html.dart";
import "package:nexus/widgets/chat_page/wrappers/message_wrapper.dart";
import "package:nexus/widgets/chat_page/reply_widget.dart";
class TextMessageWrapper extends StatelessWidget {
class TextMessageWrapper extends ConsumerWidget {
final Message message;
final String? content;
final MessageGroupStatus? groupStatus;
@ -27,7 +33,7 @@ class TextMessageWrapper extends StatelessWidget {
});
@override
Widget build(BuildContext context) {
Widget build(BuildContext context, WidgetRef ref) {
final theme = Theme.of(context);
final colorScheme = theme.colorScheme;
final textMessage = message is TextMessage ? message as TextMessage : null;
@ -80,27 +86,35 @@ class TextMessageWrapper extends StatelessWidget {
if (textMessage?.editedAt != null)
Text("(edited)", style: theme.textTheme.labelSmall),
if (textMessage != null)
LinkPreview(
text: textMessage.text,
backgroundColor: isSentByMe
? colorScheme.inversePrimary
: colorScheme.surfaceContainerLow,
outsidePadding: EdgeInsets.only(top: 4),
insidePadding: EdgeInsets.symmetric(
vertical: 8,
horizontal: 16,
),
linkPreviewData: message.metadata?["linkPreviewData"],
onLinkPreviewDataFetched: (linkPreviewData) => updateMessage(
message,
message.copyWith(
metadata: {
...(message.metadata ?? {}),
"linkPreviewData": linkPreviewData,
},
ref
.watch(UrlPreviewController.provider(textMessage))
.betterWhen(
loading: SizedBox.shrink,
data: (preview) => preview == null
? SizedBox.shrink()
: LinkPreview(
imageBuilder: (url) => Image(
image: CachedNetworkImage(
url,
ref.watch(CrossCacheController.provider),
headers: ref.headers,
),
fit: BoxFit.cover,
errorBuilder: (_, _, _) => SizedBox.shrink(),
),
text: textMessage.text,
backgroundColor: isSentByMe
? colorScheme.inversePrimary
: colorScheme.surfaceContainerLow,
outsidePadding: EdgeInsets.only(top: 4),
insidePadding: EdgeInsets.symmetric(
vertical: 8,
horizontal: 16,
),
linkPreviewData: preview,
onLinkPreviewDataFetched: (_) => null,
),
),
),
),
if (extra != null) extra!,
],
),