web: Add parameters to API requests for empty topic name support.

This commit adds `allow_empty_name: true` to the following
endpoints to receive empty strings as topic name when such
topics are available:
* `GET /messages`
* `GET /messages/{message_id}`
* `GET /messages/{message_id}/history`

Also, it adds `empty_topic_name` client capability for spectators.

These changes are part of the broader effort to enable
support for empty string as a topic name.

web/src/compose_reply.ts

@@ -321,6 +321,7 @@ export function quote_message(opts: {
 
     void channel.get({
         url: "/json/messages/" + message_id,
+        data: {allow_empty_topic_name: true},
         success(raw_data) {
             const data = z.object({raw_content: z.string()}).parse(raw_data);
             replace_content(message, data.raw_content);

web/src/message_edit.ts

@@ -669,6 +669,7 @@ export function start($row: JQuery, edit_box_open_callback?: () => void): void {
     const msg_list = message_lists.current;
     void channel.get({
         url: "/json/messages/" + message.id,
+        data: {allow_empty_topic_name: true},
         success(data) {
             const {raw_content} = z.object({raw_content: z.string()}).parse(data);
             if (message_lists.current === msg_list) {
@@ -1582,6 +1583,7 @@ export function with_first_message_id(
             {operator: "channel", operand: stream_id},
             {operator: "topic", operand: topic_name},
         ]),
+        allow_empty_topic_name: true,
     };
 
     void channel.get({
@@ -1617,6 +1619,7 @@ export function is_message_oldest_or_newest(
             {operator: "channel", operand: stream_id},
             {operator: "topic", operand: topic_name},
         ]),
+        allow_empty_topic_name: true,
     };
 
     void channel.get({

web/src/message_edit_history.ts

@@ -114,7 +114,10 @@ export function fetch_and_render_message_history(message: Message): void {
     show_loading_indicator();
     void channel.get({
         url: "/json/messages/" + message.id + "/history",
-        data: {message_id: JSON.stringify(message.id)},
+        data: {
+            message_id: JSON.stringify(message.id),
+            allow_empty_topic_name: true,
+        },
         success(raw_data) {
             const data = server_message_history_schema.parse(raw_data);
 

web/src/message_events.ts

@@ -192,6 +192,7 @@ export let update_views_filtered_on_message_property = (
                 data: {
                     message_ids: JSON.stringify(message_ids),
                     narrow: JSON.stringify(filter.terms()),
+                    allow_empty_topic_name: true,
                 },
                 success(data) {
                     const messages_to_add: Message[] = [];
@@ -216,6 +217,7 @@ export let update_views_filtered_on_message_property = (
                 url: "/json/messages",
                 data: {
                     message_ids: JSON.stringify(messages_to_fetch),
+                    allow_empty_topic_name: true,
                     // We don't filter by narrow here since we can
                     // apply the filter locally and the fetched message
                     // can be used to update other message lists and

web/src/message_fetch.ts

@@ -59,6 +59,7 @@ type MessageFetchAPIParams = {
     num_after: number;
     client_gravatar: boolean;
     narrow?: string;
+    allow_empty_topic_name: boolean;
 };
 
 let first_messages_fetch = true;
@@ -329,6 +330,7 @@ function get_parameters_for_message_fetch_api(opts: MessageFetchOptions): Messag
         num_before: opts.num_before,
         num_after: opts.num_after,
         client_gravatar: true,
+        allow_empty_topic_name: true,
     };
     const msg_list_data = opts.msg_list_data;
 

web/src/message_flags.ts

@@ -110,6 +110,7 @@ export function unstar_all_messages_in_topic(stream_id: number, topic: string):
             {operator: "topic", operand: topic},
             {operator: "is", operand: "starred"},
         ]),
+        allow_empty_topic_name: true,
     };
 
     void channel.get({

web/src/message_view.ts

@@ -555,6 +555,7 @@ export let show = (raw_terms: NarrowTerm[], show_opts: ShowMessageViewOpts): voi
                 // for it.
                 channel.get({
                     url: `/json/messages/${id_info.target_id}`,
+                    data: {allow_empty_topic_name: true},
                     success(raw_data) {
                         const data = fetch_message_response_schema.parse(raw_data);
                         // After the message is fetched, we make the

web/src/state_data.ts

@@ -334,6 +334,7 @@ export const realm_schema = z.object({
             config: z.record(z.string()),
         }),
     ),
+    realm_empty_topic_display_name: z.string(),
     realm_enable_guest_user_indicator: z.boolean(),
     realm_enable_read_receipts: z.boolean(),
     realm_enable_spectator_access: z.boolean(),

web/src/stream_topic_history_util.ts

@@ -56,6 +56,7 @@ export function update_topic_last_message_id(
             anchor: "newest",
             num_before: 1,
             num_after: 0,
+            allow_empty_topic_name: true,
         },
         success(data) {
             const {messages} = z

web/src/ui_init.js

@@ -709,6 +709,7 @@ $(() => {
                 // Set this to true when stream typing notifications are implemented.
                 stream_typing_notifications: false,
                 user_settings_object: true,
+                empty_topic_name: true,
             }),
             client_gravatar: false,
         };

web/tests/message_flags.test.cjs

@@ -143,6 +143,7 @@ run_test("unstar_all_in_topic", ({override}) => {
             {operator: "topic", operand: "topic"},
             {operator: "is", operand: "starred"},
         ]),
+        allow_empty_topic_name: true,
     });
 
     assert.deepEqual(channel_post_opts.data, {

web/tests/stream_topic_history.test.cjs

@@ -426,6 +426,7 @@ test("ask_server_for_latest_topic_data", () => {
             narrow: '[{"operator":"stream","operand":1080},{"operator":"topic","operand":"Topic1"}]',
             num_after: 0,
             num_before: 1,
+            allow_empty_topic_name: true,
         });
         success_callback = opts.success;
     };