1 files changed, 33 insertions, 0 deletions
diff --git a/src/lib/pgp/user.ts b/src/lib/pgp/user.ts
new file mode 100644
index 0000000..334fbde
--- /dev/null
+++ b/src/lib/pgp/user.ts
@@ -0,0 +1,33 @@
+import { PublicKey, type Subkey, UserIDPacket } from "openpgp";
+import type { Signature } from "./sign.ts";
+import { defined, get } from "../../utils/anonymous.ts";
+
+export function getUserIDsFromKey(
+  signature: Signature | undefined,
+  key: PublicKey | Subkey,
+): UserIDPacket[] {
+  const packet = signature?.getPackets?.()?.[0];
+  const userID = packet?.signersUserID;
+
+  if (userID) {
+    return [UserIDPacket.fromObject(parseUserID(userID))];
+  }
+
+  key = key instanceof PublicKey ? key : key.mainKey;
+  return key.users.map(get("userID")).filter(defined);
+}
+
+function parseUserID(input: string) {
+  const regex = /^(.*?)\s*(?:\((.*?)\))?\s*(?:<(.+?)>)?$/;
+  const match = input.match(regex);
+
+  if (!match) return {};
+
+  const [, name, comment, email] = match;
+
+  return {
+    name: name?.trim() || undefined,
+    comment: comment?.trim() || undefined,
+    email: email?.trim() || undefined,
+  };
+}