feature: Log authentication failures to support fail2ban. Fixes #477 (#569)

* How do I set the variable "user" or "system" for AI inference #262
changed from system to user

* [Feature Request] Log failed login attempts for fail2ban implementation
#477
added logging of failed logins

* [Feature Request] Log failed login attempts for fail2ban implementation #477
added more logging for extension related logins

* Propagte IP to trpc

---------

Co-authored-by: Your Name <you@example.com>

3 files changed, 37 insertions, 5 deletions

diff --git a/apps/web/package.json b/apps/web/package.json
index e6691563..cbc01a50 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -68,6 +68,7 @@
     "react-syntax-highlighter": "^15.5.0",
     "remark-breaks": "^4.0.0",
     "remark-gfm": "^4.0.0",
+    "request-ip": "^3.3.0",
     "sharp": "^0.33.3",
     "superjson": "^2.2.1",
     "tailwind-merge": "^2.2.1",
@@ -83,6 +84,7 @@
     "@types/react": "^18.2.55",
     "@types/react-dom": "^18.2.19",
     "@types/react-syntax-highlighter": "^15.5.13",
+    "@types/request-ip": "^0.0.41",
     "autoprefixer": "^10.4.17",
     "postcss": "^8.4.35",
     "tailwindcss": "^3.4.1",
diff --git a/apps/web/server/api/client.ts b/apps/web/server/api/client.ts
index 6a0a8909..fb2d84bc 100644
--- a/apps/web/server/api/client.ts
+++ b/apps/web/server/api/client.ts
@@ -1,4 +1,6 @@
+import { headers } from "next/headers";
 import { getServerAuthSession } from "@/server/auth";
+import requestIp from "request-ip";
 
 import { db } from "@hoarder/db";
 import { Context, createCallerFactory } from "@hoarder/trpc";
@@ -8,25 +10,46 @@ import { appRouter } from "@hoarder/trpc/routers/_app";
 export async function createContextFromRequest(req: Request) {
   // TODO: This is a hack until we offer a proper REST API instead of the trpc based one.
   // Check if the request has an Authorization token, if it does, assume that API key authentication is requested.
+  const ip = requestIp.getClientIp({
+    headers: Object.fromEntries(req.headers.entries()),
+  });
   const authorizationHeader = req.headers.get("Authorization");
   if (authorizationHeader && authorizationHeader.startsWith("Bearer ")) {
     const token = authorizationHeader.split(" ")[1];
     try {
       const user = await authenticateApiKey(token);
-      return { user, db };
+      return {
+        user,
+        db,
+        req: {
+          ip,
+        },
+      };
     } catch (e) {
       // Fallthrough to cookie-based auth
     }
   }
 
-  return createContext();
+  return createContext(db, ip);
 }
 
-export const createContext = async (database?: typeof db): Promise<Context> => {
+export const createContext = async (
+  database?: typeof db,
+  ip?: string | null,
+): Promise<Context> => {
   const session = await getServerAuthSession();
+  if (ip === undefined) {
+    const hdrs = headers();
+    ip = requestIp.getClientIp({
+      headers: Object.fromEntries(hdrs.entries()),
+    });
+  }
   return {
     user: session?.user ?? null,
     db: database ?? db,
+    req: {
+      ip,
+    },
   };
 };
 
diff --git a/apps/web/server/auth.ts b/apps/web/server/auth.ts
index 042be1ae..ee226743 100644
--- a/apps/web/server/auth.ts
+++ b/apps/web/server/auth.ts
@@ -8,6 +8,7 @@ import NextAuth, {
 } from "next-auth";
 import CredentialsProvider from "next-auth/providers/credentials";
 import { Provider } from "next-auth/providers/index";
+import requestIp from "request-ip";
 
 import { db } from "@hoarder/db";
 import {
@@ -17,7 +18,7 @@ import {
   verificationTokens,
 } from "@hoarder/db/schema";
 import serverConfig from "@hoarder/shared/config";
-import { validatePassword } from "@hoarder/trpc/auth";
+import { logAuthenticationError, validatePassword } from "@hoarder/trpc/auth";
 
 type UserRole = "admin" | "user";
 
@@ -77,7 +78,7 @@ const providers: Provider[] = [
       email: { label: "Email", type: "email", placeholder: "Email" },
       password: { label: "Password", type: "password" },
     },
-    async authorize(credentials) {
+    async authorize(credentials, req) {
       if (!credentials) {
         return null;
       }
@@ -88,6 +89,12 @@ const providers: Provider[] = [
           credentials?.password,
         );
       } catch (e) {
+        const error = e as Error;
+        logAuthenticationError(
+          credentials?.email,
+          error.message,
+          requestIp.getClientIp({ headers: req.headers }),
+        );
         return null;
       }
     },