fix oidc callback behind reverse proxy

README.md

@@ -48,6 +48,7 @@ OIDC_ISSUER=https://casdoor.example.com
 OIDC_CLIENT_ID=analytics
 OIDC_CLIENT_SECRET=replace-me
 AUTH_SECRET=replace-with-random-secret
+NEXTAUTH_URL=https://your-analytics-domain
 # Optional login button label:
 OIDC_PROVIDER_NAME=Sinodoor
 ```
@@ -64,6 +65,8 @@ When OIDC is enabled, configure the provider redirect URI as:
 https://your-analytics-domain/api/auth/callback/oidc
 ```
 
+`NEXTAUTH_URL` must be the same public `https://` origin that users open through the reverse proxy. This keeps login redirects and callback URLs from using the container listener such as `http://0.0.0.0:8019`.
+
 Partial OIDC configuration is treated as an error instead of falling back to open access.
 
 ## Deployment

docker-compose.coolify.yml

@@ -7,6 +7,13 @@ services:
       - "8019:8019"
     environment:
       - SERVICE_URL_ANALYTICS_8019
+      - PG_CONNECTION_STRING
+      - OIDC_ISSUER
+      - OIDC_CLIENT_ID
+      - OIDC_CLIENT_SECRET
+      - AUTH_SECRET
+      - NEXTAUTH_URL
+      - OIDC_PROVIDER_NAME
     networks:
       - coolify
 

lib/auth-config.ts

@@ -4,6 +4,7 @@ export interface AuthEnv {
   OIDC_CLIENT_SECRET?: string;
   OIDC_PROVIDER_NAME?: string;
   AUTH_SECRET?: string;
+  NEXTAUTH_URL?: string;
 }
 
 export interface AuthMode {

proxy.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test";
+import { NextRequest } from "next/server";
+import { buildPublicRequestUrl } from "./proxy";
+
+describe("public request URL", () => {
+  test("uses NEXTAUTH_URL for OIDC callback URLs behind Docker reverse proxies", () => {
+    const request = new NextRequest("http://0.0.0.0:8019/logs?range=7d");
+
+    expect(
+      buildPublicRequestUrl(request, {
+        NEXTAUTH_URL: "https://analytics.example.com",
+      }).href
+    ).toBe("https://analytics.example.com/logs?range=7d");
+  });
+
+  test("falls back to forwarded proxy headers when no public URL is configured", () => {
+    const request = new NextRequest("http://0.0.0.0:8019/", {
+      headers: {
+        "x-forwarded-host": "analytics.example.com",
+        "x-forwarded-proto": "https",
+      },
+    });
+
+    expect(buildPublicRequestUrl(request).href).toBe("https://analytics.example.com/");
+  });
+});

proxy.ts

@@ -1,6 +1,12 @@
 import { getToken } from "next-auth/jwt";
 import { NextResponse, type NextRequest } from "next/server";
-import { getAuthMode, getRequiredAuthSecret, isAuthRoute, isProtectedPath } from "@/lib/auth-config";
+import {
+  getAuthMode,
+  getRequiredAuthSecret,
+  isAuthRoute,
+  isProtectedPath,
+  type AuthEnv,
+} from "@/lib/auth-config";
 
 export async function proxy(request: NextRequest) {
   const { pathname } = request.nextUrl;
@@ -24,8 +30,9 @@ export async function proxy(request: NextRequest) {
     return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
   }
 
-  const signInUrl = new URL("/api/auth/signin/oidc", request.url);
+  const callbackUrl = buildPublicRequestUrl(request);
-  signInUrl.searchParams.set("callbackUrl", request.nextUrl.href);
+  const signInUrl = new URL("/api/auth/signin/oidc", callbackUrl);
+  signInUrl.searchParams.set("callbackUrl", callbackUrl.href);
   return NextResponse.redirect(signInUrl);
 }
 
@@ -46,6 +53,37 @@ function authConfigErrorResponse(request: NextRequest, error: string) {
   });
 }
 
+export function buildPublicRequestUrl(request: NextRequest, env: AuthEnv = process.env): URL {
+  const origin = getPublicOrigin(request, env);
+  return new URL(`${request.nextUrl.pathname}${request.nextUrl.search}`, origin);
+}
+
+function getPublicOrigin(request: NextRequest, env: AuthEnv): string {
+  const configuredOrigin = getConfiguredOrigin(env.NEXTAUTH_URL);
+  if (configuredOrigin) return configuredOrigin;
+
+  const forwardedHost = firstHeaderValue(request.headers.get("x-forwarded-host"));
+  const host = forwardedHost || firstHeaderValue(request.headers.get("host")) || request.nextUrl.host;
+  const forwardedProto = firstHeaderValue(request.headers.get("x-forwarded-proto"));
+  const proto = forwardedProto || request.nextUrl.protocol.replace(":", "") || "http";
+
+  return `${proto}://${host}`;
+}
+
+function getConfiguredOrigin(value: string | undefined): string | null {
+  if (!value?.trim()) return null;
+
+  try {
+    return new URL(value).origin;
+  } catch {
+    return null;
+  }
+}
+
+function firstHeaderValue(value: string | null): string {
+  return value?.split(",")[0]?.trim() ?? "";
+}
+
 function authErrorHtml(error: string): string {
   return `<!doctype html>
 <html lang="zh">