Pass 1 of pulling traefik config into functions

server/lib/traefik/certResolver.ts

@@ -0,0 +1,44 @@
+import config from "@server/lib/config";
+
+/**
+ * Build the Traefik `tls` block for a domain using the cert-resolver /
+ * wildcard-cert logic shared by both the OSS and private Traefik config
+ * generators (used whenever certs are obtained directly via ACME rather
+ * than through pangolin-dns).
+ */
+export function buildWildcardTls(params: {
+    fullDomain: string;
+    hasSubdomain: boolean;
+    domainCertResolver?: string | null;
+    preferWildcardCert?: boolean | null;
+}): { certResolver: string | undefined; domains?: { main: string }[] } {
+    const { fullDomain, hasSubdomain, domainCertResolver, preferWildcardCert } =
+        params;
+
+    const domainParts = fullDomain.split(".");
+    let wildCard =
+        domainParts.length <= 2
+            ? `*.${domainParts.join(".")}`
+            : `*.${domainParts.slice(1).join(".")}`;
+    if (!hasSubdomain) {
+        wildCard = fullDomain;
+    }
+
+    const globalDefaultResolver = config.getRawConfig().traefik.cert_resolver;
+    const globalDefaultPreferWildcard =
+        config.getRawConfig().traefik.prefer_wildcard_cert;
+
+    const resolverName = domainCertResolver
+        ? domainCertResolver.trim()
+        : globalDefaultResolver;
+
+    const preferWildcard =
+        preferWildcardCert !== undefined && preferWildcardCert !== null
+            ? preferWildcardCert
+            : globalDefaultPreferWildcard;
+
+    return {
+        certResolver: resolverName,
+        ...(preferWildcard ? { domains: [{ main: wildCard }] } : {})
+    };
+}