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src/server/tenant/service.ts

@@ -0,0 +1,41 @@
+import {NextRequest} from "next/server";
+
+function decodeB64Json(b64: string) {
+    try {
+        const s = b64.replace(/-/g, "+").replace(/_/g, "/");
+        const pad = s.length % 4 === 2 ? "=="
+            : s.length % 4 === 3 ? "="
+                : "";
+        const json = Buffer.from(s + pad, "base64").toString("utf8");
+        return JSON.parse(json);
+    } catch {
+        return null;
+    }
+}
+
+export function resolveTenantFromRequest(req: NextRequest): string {
+    const ui = req.cookies.get("user_info")?.value;
+    if (ui) {
+        try {
+            const parsed = JSON.parse(Buffer.from(ui, "base64").toString("utf8"));
+            if (parsed?.tenantKey && typeof parsed.tenantKey === "string") return parsed.tenantKey;
+        } catch {
+        }
+    }
+
+    const access = req.cookies.get("access_token")?.value;
+    if (access && access.split(".").length >= 2) {
+        const payloadB64 = access.split(".")[1];
+        const payload = decodeB64Json(payloadB64);
+        const tk = payload?.tenant_key ?? payload?.tenantKey;
+        if (typeof tk === "string" && tk) return tk;
+    }
+
+    const host = req.headers.get("host") ?? "";
+    const parts = host.split(".");
+    if (parts.length >= 3) return parts[0];
+
+    if (process.env.DEFAULT_TENANT_KEY) return process.env.DEFAULT_TENANT_KEY;
+
+    return "default";
+}