Merge pull request #499 from zitadel/saml-idp

fix(saml-idp): post binding

apps/login/src/app/login/route.ts

@@ -217,7 +217,7 @@ export async function GET(request: NextRequest) {
             params.set("organization", organization);
           }
 
-          return startIdentityProviderFlow({
+          let url: string | null = await startIdentityProviderFlow({
             serviceUrl,
             idpId,
             urls: {
@@ -228,14 +228,21 @@ export async function GET(request: NextRequest) {
                 `${origin}/idp/${provider}/failure?` +
                 new URLSearchParams(params),
             },
-          }).then((resp) => {
-            if (
-              resp.nextStep.value &&
-              typeof resp.nextStep.value === "string"
-            ) {
-              return NextResponse.redirect(resp.nextStep.value);
-            }
           });
+
+          if (!url) {
+            return NextResponse.json(
+              { error: "Could not start IDP flow" },
+              { status: 500 },
+            );
+          }
+
+          if (url.startsWith("/")) {
+            // if the url is a relative path, construct the absolute url
+            url = constructUrl(request, url).toString();
+          }
+
+          return NextResponse.redirect(url);
         }
       }
     }

apps/login/src/i18n/request.ts

@@ -16,7 +16,7 @@ export default getRequestConfig(async () => {
   const { serviceUrl } = getServiceUrlFromHeaders(_headers);
 
   const i18nOrganization = _headers.get("x-zitadel-i18n-organization") || ""; // You may need to set this header in middleware
-  console.log("i18nOrganization:", i18nOrganization);
+
   let translations: JsonObject | {} = {};
   try {
     const i18nJSON = await getHostedLoginTranslation({

apps/login/src/lib/server/idp.ts

@@ -74,22 +74,20 @@ export type StartIDPFlowCommand = {
 async function startIDPFlow(command: StartIDPFlowCommand) {
   const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
-  return startIdentityProviderFlow({
+  const url = await startIdentityProviderFlow({
     serviceUrl: command.serviceUrl,
     idpId: command.idpId,
     urls: {
       successUrl: `${command.host.includes("localhost") ? "http://" : "https://"}${command.host}${basePath}${command.successUrl}`,
       failureUrl: `${command.host.includes("localhost") ? "http://" : "https://"}${command.host}${basePath}${command.failureUrl}`,
     },
-  }).then((response) => {
-    if (
-      response &&
-      response.nextStep.case === "authUrl" &&
-      response?.nextStep.value
-    ) {
-      return { redirect: response.nextStep.value };
-    }
   });
+
+  if (!url) {
+    return { error: "Could not start IDP flow" };
+  }
+
+  return { redirect: url };
 }
 
 type CreateNewSessionCommand = {

apps/login/src/lib/server/loginname.ts

@@ -102,7 +102,7 @@ export async function sendLoginname(command: SendLoginnameCommand) {
 
       const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
-      const resp = await startIdentityProviderFlow({
+      const url = await startIdentityProviderFlow({
         serviceUrl,
         idpId: identityProviders[0].id,
         urls: {
@@ -115,9 +115,11 @@ export async function sendLoginname(command: SendLoginnameCommand) {
         },
       });
 
-      if (resp?.nextStep.case === "authUrl") {
-        return { redirect: resp.nextStep.value };
+      if (!url) {
+        return { error: "Could not start IDP flow" };
       }
+
+      return { redirect: url };
     }
   };
 
@@ -166,7 +168,7 @@ export async function sendLoginname(command: SendLoginnameCommand) {
 
       const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
-      const resp = await startIdentityProviderFlow({
+      const url = await startIdentityProviderFlow({
         serviceUrl,
         idpId: idp.id,
         urls: {
@@ -179,9 +181,11 @@ export async function sendLoginname(command: SendLoginnameCommand) {
         },
       });
 
-      if (resp?.nextStep.case === "authUrl") {
-        return { redirect: resp.nextStep.value };
+      if (!url) {
+        return { error: "Could not start IDP flow" };
       }
+
+      return { redirect: url };
     }
   };
 

apps/login/src/lib/zitadel.ts

@@ -23,7 +23,10 @@ import {
 import { LoginSettings } from "@zitadel/proto/zitadel/settings/v2/login_settings_pb";
 import { SettingsService } from "@zitadel/proto/zitadel/settings/v2/settings_service_pb";
 import { SendEmailVerificationCodeSchema } from "@zitadel/proto/zitadel/user/v2/email_pb";
-import type { RedirectURLsJson } from "@zitadel/proto/zitadel/user/v2/idp_pb";
+import type {
+  FormData,
+  RedirectURLsJson,
+} from "@zitadel/proto/zitadel/user/v2/idp_pb";
 import {
   NotificationType,
   SendPasswordResetLinkSchema,
@@ -88,7 +91,6 @@ export async function getHostedLoginTranslation({
       {},
     )
     .then((resp) => {
-      console.log(resp);
       return resp.translations ? resp.translations : undefined;
     });
 
@@ -964,19 +966,38 @@ export async function startIdentityProviderFlow({
   serviceUrl: string;
   idpId: string;
   urls: RedirectURLsJson;
-}) {
+}): Promise<string | null> {
   const userService: Client<typeof UserService> = await createServiceForHost(
     UserService,
     serviceUrl,
   );
 
-  return userService.startIdentityProviderIntent({
-    idpId,
-    content: {
-      case: "urls",
-      value: urls,
-    },
-  });
+  return userService
+    .startIdentityProviderIntent({
+      idpId,
+      content: {
+        case: "urls",
+        value: urls,
+      },
+    })
+    .then((resp) => {
+      if (resp.nextStep.case === "authUrl" && resp.nextStep.value) {
+        return resp.nextStep.value;
+      } else if (resp.nextStep.case === "formData" && resp.nextStep.value) {
+        const formData: FormData = resp.nextStep.value;
+        const redirectUrl = "/saml-post";
+
+        const params = new URLSearchParams({ url: formData.url });
+
+        Object.entries(formData.fields).forEach(([k, v]) => {
+          params.append(k, v);
+        });
+
+        return `${redirectUrl}?${params.toString()}`;
+      } else {
+        return null;
+      }
+    });
 }
 
 export async function startLDAPIdentityProviderFlow({