feat(desktop): use healthchat:// deep-link scheme instead of element://

Switch the friendly deep-link / legacy SSO callback scheme from element://
to healthchat:// and stop registering element:// entirely. The reverse-DNS
OIDC primary scheme (ch.healthchat.desktop://) is unchanged. Also rebrand the
round-tripped SSO id param element-desktop-ssoid -> healthchat-desktop-ssoid
on both the desktop and web sides.

apps/desktop/src/protocol.test.ts

@@ -47,7 +47,7 @@ describe("ProtocolHandler", () => {
             expect(
                 handler.getProfileFromDeeplink([
                     "Element.app",
-                    `element://vector/webapp/?element-desktop-ssoid=${TEST_SESSION_ID}`,
+                    `healthchat://vector/webapp/?healthchat-desktop-ssoid=${TEST_SESSION_ID}`,
                 ]),
             ).toBe(USER_DATA_DIR);
         });
@@ -56,7 +56,7 @@ describe("ProtocolHandler", () => {
             expect(
                 handler.getProfileFromDeeplink([
                     "Element.app",
-                    `${TEST_PROTOCOL}:/vector/webapp/?no_universal_links=true&code=DEADBEEF&state=foobar:element-desktop-ssoid:${TEST_SESSION_ID}`,
+                    `${TEST_PROTOCOL}:/vector/webapp/?no_universal_links=true&code=DEADBEEF&state=foobar:healthchat-desktop-ssoid:${TEST_SESSION_ID}`,
                 ]),
             ).toBe(USER_DATA_DIR);
         });
@@ -65,7 +65,7 @@ describe("ProtocolHandler", () => {
             expect(
                 handler.getProfileFromDeeplink([
                     "Element.app",
-                    `${TEST_PROTOCOL}:/vector/webapp/?no_universal_links=true#code=DEADBEEF&state=foobar:element-desktop-ssoid:${TEST_SESSION_ID}`,
+                    `${TEST_PROTOCOL}:/vector/webapp/?no_universal_links=true#code=DEADBEEF&state=foobar:healthchat-desktop-ssoid:${TEST_SESSION_ID}`,
                 ]),
             ).toBe(USER_DATA_DIR);
         });
@@ -74,7 +74,7 @@ describe("ProtocolHandler", () => {
             expect(
                 handler.getProfileFromDeeplink([
                     "Element.app",
-                    `${TEST_PROTOCOL}:/vector/webapp/?no_universal_links=true#code=DEADBEEF:element-desktop-ssoid:${TEST_SESSION_ID}`,
+                    `${TEST_PROTOCOL}:/vector/webapp/?no_universal_links=true#code=DEADBEEF:healthchat-desktop-ssoid:${TEST_SESSION_ID}`,
                 ]),
             ).toBeUndefined();
         });

apps/desktop/src/protocol.ts

@@ -12,8 +12,8 @@ import path from "node:path";
 import fs from "node:fs";
 import { randomUUID } from "node:crypto";
 
-const LEGACY_PROTOCOL = "element";
+const LEGACY_PROTOCOL = "healthchat";
-const SEARCH_PARAM = "element-desktop-ssoid";
+const SEARCH_PARAM = "healthchat-desktop-ssoid";
 const STORE_FILE_NAME = "sso-sessions.json";
 
 // we getPath userData before electron-main changes it, so this is the default value
@@ -130,8 +130,8 @@ export default class ProtocolHandler {
                 const store = this.readStore();
                 let sessionId = parsedUrl.searchParams.get(SEARCH_PARAM);
                 if (!sessionId) {
-                    // In OIDC, we must shuttle the value in the `state` param rather than `element-desktop-ssoid`
+                    // In OIDC, we must shuttle the value in the `state` param rather than `healthchat-desktop-ssoid`
-                    // We encode it as a suffix like `:element-desktop-ssoid:XXYYZZ`.
+                    // We encode it as a suffix like `:healthchat-desktop-ssoid:XXYYZZ`.
                     // The OIDC flow may have used response_mode=fragment or query, so we need to handle both cases.
                     let searchParams = parsedUrl.searchParams;
                     if (parsedUrl.hash.includes("=")) {

apps/web/src/BasePlatform.ts

@@ -456,7 +456,7 @@ export default abstract class BasePlatform {
 
     /**
      * Suffix to append to the `state` parameter of OIDC /auth calls. Will be round-tripped to the callback URI.
-     * Currently only required for ElectronPlatform for passing element-desktop-ssoid.
+     * Currently only required for ElectronPlatform for passing healthchat-desktop-ssoid.
      */
     public getOidcClientState(): string {
         return "";

apps/web/src/vector/platform/ElectronPlatform.tsx

@@ -53,7 +53,7 @@ interface SquirrelUpdate {
     updateURL: string;
 }
 
-const SSO_ID_KEY = "element-desktop-ssoid";
+const SSO_ID_KEY = "healthchat-desktop-ssoid";
 
 function platformFriendlyName(): string {
     // used to use window.process but the same info is available here
@@ -466,7 +466,7 @@ export default class ElectronPlatform extends BasePlatform {
 
     public getSSOCallbackUrl(fragmentAfterLogin?: string): URL {
         const url = super.getSSOCallbackUrl(fragmentAfterLogin);
-        url.protocol = "element";
+        url.protocol = "healthchat";
         url.searchParams.set(SSO_ID_KEY, this.sessionId);
         return url;
     }

apps/web/test/unit-tests/vector/platform/ElectronPlatform-test.ts

@@ -83,7 +83,7 @@ describe("ElectronPlatform", () => {
     it("should return oidc client state as expected", async () => {
         const platform = new ElectronPlatform();
         await platform.getConfig();
-        expect(platform.getOidcClientState()).toMatchInlineSnapshot(`":element-desktop-ssoid:session-id"`);
+        expect(platform.getOidcClientState()).toMatchInlineSnapshot(`":healthchat-desktop-ssoid:session-id"`);
     });
 
     it("dispatches view settings action on preferences event", () => {