Try to find out the Matrix homeserver version and include in rageshakes

src/components/views/dialogs/devtools/ServerInfo.tsx

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import React, { useContext } from "react";
+import { MatrixClient } from "matrix-js-sdk/src/matrix";
 
 import BaseTool, { IDevtoolsProps } from "./BaseTool";
 import { _t } from "../../../../languageHandler";
@@ -33,28 +34,32 @@ interface IServerWellKnown {
     };
 }
 
+export async function getServerVersionFromFederationApi(client: MatrixClient): Promise<IServerWellKnown> {
+    let baseUrl = client.getHomeserverUrl();
+
+    try {
+        const hsName = MatrixClientPeg.getHomeserverName();
+        // We don't use the js-sdk Autodiscovery module here as it only support client well-known, not server ones.
+        const response = await fetch(`https://${hsName}/.well-known/matrix/server`);
+        const json = await response.json();
+        if (json["m.server"]) {
+            baseUrl = `https://${json["m.server"]}`;
+        }
+    } catch (e) {
+        console.warn(e);
+    }
+
+    const response = await fetch(`${baseUrl}/_matrix/federation/v1/version`);
+    return response.json();
+}
+
 const ServerInfo: React.FC<IDevtoolsProps> = ({ onBack }) => {
     const cli = useContext(MatrixClientContext);
     const capabilities = useAsyncMemo(() => cli.getCapabilities(true).catch(() => FAILED_TO_LOAD), [cli]);
     const clientVersions = useAsyncMemo(() => cli.getVersions().catch(() => FAILED_TO_LOAD), [cli]);
     const serverVersions = useAsyncMemo(async (): Promise<IServerWellKnown | symbol> => {
-        let baseUrl = cli.getHomeserverUrl();
-
-        try {
-            const hsName = MatrixClientPeg.getHomeserverName();
-            // We don't use the js-sdk Autodiscovery module here as it only support client well-known, not server ones.
-            const response = await fetch(`https://${hsName}/.well-known/matrix/server`);
-            const json = await response.json();
-            if (json["m.server"]) {
-                baseUrl = `https://${json["m.server"]}`;
-            }
-        } catch (e) {
-            console.warn(e);
-        }
-
         try {
-            const response = await fetch(`${baseUrl}/_matrix/federation/v1/version`);
-            return response.json();
+            return await getServerVersionFromFederationApi(cli);
         } catch (e) {
             console.warn(e);
         }

src/rageshake/submit-rageshake.ts

@@ -17,6 +17,7 @@ limitations under the License.
 */
 
 import { logger } from "matrix-js-sdk/src/logger";
+import { Method } from "matrix-js-sdk/src/http-api";
 
 import type * as Pako from "pako";
 import { MatrixClientPeg } from "../MatrixClientPeg";
@@ -25,6 +26,7 @@ import { _t } from "../languageHandler";
 import * as rageshake from "./rageshake";
 import SettingsStore from "../settings/SettingsStore";
 import SdkConfig from "../SdkConfig";
+import { getServerVersionFromFederationApi } from "../components/views/dialogs/devtools/ServerInfo";
 
 interface IOpts {
     labels?: string[];
@@ -122,6 +124,43 @@ async function collectBugReport(opts: IOpts = {}, gzipLogs = true): Promise<Form
             body.append("session_backup_key_cached", String(!!sessionBackupKeyFromCache));
             body.append("session_backup_key_well_formed", String(sessionBackupKeyFromCache instanceof Uint8Array));
         }
+
+        try {
+            // XXX: This is synapse-specific but better than nothing until MSC support for a server version endpoint
+            const data = await client.http.request<Record<string, any>>(
+                Method.Get,
+                "/server_version",
+                undefined,
+                undefined,
+                {
+                    prefix: "/_synapse/admin/v1",
+                },
+            );
+            Object.keys(data).forEach((key) => {
+                body.append(`matrix_hs_${key}`, data[key]);
+            });
+        } catch {
+            try {
+                // XXX: This relies on the federation listener being delegated via well-known
+                // or at the same place as the client server endpoint
+                const data = await getServerVersionFromFederationApi(client);
+                body.append("matrix_hs_name", data.server.name);
+                body.append("matrix_hs_version", data.server.version);
+            } catch {
+                try {
+                    // If that fails we'll hit any endpoint and look at the server response header
+                    const res = await window.fetch(client.http.getUrl("/login"), {
+                        method: "GET",
+                        mode: "cors",
+                    });
+                    if (res.headers.has("server")) {
+                        body.append("matrix_hs_server", res.headers.get("server")!);
+                    }
+                } catch {
+                    // Could not determine server version
+                }
+            }
+        }
     }
 
     if (opts.labels) {