Refactor app orchestrator into Application with dependency injection

js/utils/magnetValidators.js

@@ -0,0 +1,59 @@
+// js/utils/magnetValidators.js
+
+import { safeDecodeMagnet } from "../magnetUtils.js";
+
+/**
+ * Basic validation for BitTorrent magnet URIs.
+ *
+ * Returns `true` only when the value looks like a magnet link that WebTorrent
+ * understands (`magnet:` scheme with at least one `xt=urn:btih:<info-hash>`
+ * entry, where `<info-hash>` is either a 40-character hex digest or a
+ * 32-character base32 digest). Magnets that only contain BitTorrent v2 hashes
+ * (e.g. `btmh`) are treated as unsupported.
+ */
+export function isValidMagnetUri(magnet) {
+  const trimmed = typeof magnet === "string" ? magnet.trim() : "";
+  if (!trimmed) {
+    return false;
+  }
+
+  const decoded = safeDecodeMagnet(trimmed);
+  const candidate = decoded || trimmed;
+
+  if (/^[0-9a-f]{40}$/i.test(candidate)) {
+    return true;
+  }
+
+  try {
+    const parsed = new URL(candidate);
+    if (parsed.protocol.toLowerCase() !== "magnet:") {
+      return false;
+    }
+
+    const xtValues = parsed.searchParams.getAll("xt");
+    if (!xtValues.length) {
+      return false;
+    }
+
+    const hexPattern = /^[0-9a-f]{40}$/i;
+    const base32Pattern = /^[A-Z2-7]{32}$/;
+
+    return xtValues.some((value) => {
+      if (typeof value !== "string") return false;
+      const match = value.trim().match(/^urn:btih:([a-z0-9]+)$/i);
+      if (!match) return false;
+
+      const infoHash = match[1];
+      if (hexPattern.test(infoHash)) {
+        return true;
+      }
+
+      const upperHash = infoHash.toUpperCase();
+      return infoHash.length === 32 && base32Pattern.test(upperHash);
+    });
+  } catch (err) {
+    return false;
+  }
+}
+
+export default isValidMagnetUri;