From fea19eeb2e8389a8ae2b0b65b1af019a79c0882d Mon Sep 17 00:00:00 2001
From: Jesse Wierzbinski <contact@cpluspatch.com>
Date: Wed, 17 Jul 2024 14:46:43 +0200
Subject: [PATCH] feat(federation): :sparkles: Add WebFinger forwarding to
 bridge for ActivityPub requests

---
 bun.lockb                                | Bin 258436 -> 258436 bytes
 package.json                             |   2 +-
 server/api/well-known/webfinger/index.ts |  42 ++++++++++++++++++++++-
 3 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/bun.lockb b/bun.lockb
index 48afa614c1c0f5ec0e7f10ed76284cee032a5bc5..a640a5ddb47021a51666bcd952ecb53159157114 100755
GIT binary patch
delta 153
zcmV;K0A~M$;}3-650EY(!?y60*_D?Zy<JLtz#x;x@Y6*oX;yVOSpTzZq5uZ;u}-RU
zlej4`vnX^`;y`+6SKE)3Qu)CicyZ1WPEKYF2Lkj_mURgu!uJ+EPwStXX#!f&e?iAw
z8LJFx31_x2)Fso*dUy`42BQg+>UxL0RspxYRsvK-0W!A|oC4zGmnByNAeWGY0|>Vq
HfCFf8x3fd#

delta 153
zcmV;K0A~M$;}3-650EY(W)gr@=_xZ>7dG|^O#=m_TXSji?Sm@{|4V#_Dd4b&u}-RU
zlejxDvnX^`;y@V=k3xYDVtPNn+Uy-{DyP`g1#w|FtIfB2yRhi}5Baw3FciDrzzZsN
z6m>xQdDW_?95SpDHW@^8;wK!NpvQ;3RspxYRsvK-0Wr4{oC4zGmlTNuAeWGY0|>Vq
HfCFf8it<BH

diff --git a/package.json b/package.json
index 06e7029e..20939698 100644
--- a/package.json
+++ b/package.json
@@ -104,7 +104,7 @@
         "@json2csv/plainjs": "^7.0.6",
         "@logtape/logtape": "npm:@jsr/logtape__logtape@0.4.2",
         "@lysand-org/client": "^0.2.4",
-        "@lysand-org/federation": "^2.1.1",
+        "@lysand-org/federation": "^2.1.2",
         "@oclif/core": "^4.0.12",
         "@tufjs/canonical-json": "^2.0.0",
         "altcha-lib": "^0.4.0",
diff --git a/server/api/well-known/webfinger/index.ts b/server/api/well-known/webfinger/index.ts
index 58022380..b295a6cf 100644
--- a/server/api/well-known/webfinger/index.ts
+++ b/server/api/well-known/webfinger/index.ts
@@ -7,6 +7,12 @@ import {
 import { errorResponse, jsonResponse } from "@/response";
 import type { Hono } from "@hono/hono";
 import { zValidator } from "@hono/zod-validator";
+import { getLogger } from "@logtape/logtape";
+import { SignatureConstructor } from "@lysand-org/federation";
+import {
+    FederationRequester,
+    type ResponseError,
+} from "@lysand-org/federation/requester";
 import { eq } from "drizzle-orm";
 import { lookup } from "mime-types";
 import { z } from "zod";
@@ -70,6 +76,35 @@ export default (app: Hono) =>
                 return errorResponse("User not found", 404);
             }
 
+            let activityPubUrl = "";
+
+            if (config.federation.bridge.enabled) {
+                const requester = await User.getServerActor();
+
+                const signatureConstructor =
+                    await SignatureConstructor.fromStringKey(
+                        requester.data.privateKey ?? "",
+                        requester.getUri(),
+                    );
+
+                const manager = new FederationRequester(
+                    new URL(config.federation.bridge.url ?? ""),
+                    signatureConstructor,
+                );
+
+                try {
+                    activityPubUrl = await manager.webFinger(
+                        user.data.username,
+                        new URL(config.http.base_url).host,
+                    );
+                } catch (e) {
+                    const error = e as ResponseError;
+
+                    getLogger("federation")
+                        .error`Error from bridge: ${await error.response.data}`;
+                }
+            }
+
             return jsonResponse({
                 subject: `acct:${
                     isUuid ? user.id : user.data.username
@@ -84,12 +119,17 @@ export default (app: Hono) =>
                             config.http.base_url,
                         ).toString(),
                     },
+                    activityPubUrl && {
+                        rel: "self",
+                        type: "application/activity+json",
+                        href: activityPubUrl,
+                    },
                     {
                         rel: "avatar",
                         type: lookup(user.getAvatarUrl(config)),
                         href: user.getAvatarUrl(config),
                     },
-                ],
+                ].filter(Boolean),
             });
         },
     );