init

src/paths.ts

@@ -0,0 +1,13 @@
+import { isAbsolute, join, normalize, relative } from "jsr:@std/path";
+import type { BuyerDocument } from "./types.ts";
+
+export function resolvePdfPath(baseDirectory: string, doc: BuyerDocument): string {
+  if (!baseDirectory.trim()) throw new Error("PDF base directory is not configured.");
+  if (!isAbsolute(baseDirectory)) throw new Error("PDF base directory must be absolute.");
+
+  const base = normalize(baseDirectory);
+  const full = normalize(join(base, doc._letter, doc.file_name));
+  const rel = relative(base, full);
+  if (rel.startsWith("..") || isAbsolute(rel)) throw new Error("Resolved PDF path escapes the base directory.");
+  return full;
+}