1 files changed, 63 insertions, 0 deletions
diff --git a/src/node_url.cc b/src/node_url.cc
index dd3da1133eb..f8adc7d7af5 100644
--- a/src/node_url.cc
+++ b/src/node_url.cc
@@ -2080,6 +2080,69 @@ static void DomainToUnicode(const FunctionCallbackInfo<Value>& args) {
                           v8::NewStringType::kNormal).ToLocalChecked());
 }
 
+std::string URL::ToFilePath() {
+  if (context_.scheme != "file:") {
+    return "";
+  }
+
+#ifdef _WIN32
+  const char* slash = "\\";
+  auto is_slash = [] (char ch) {
+    return ch == '/' || ch == '\\';
+  };
+#else
+  const char* slash = "/";
+  auto is_slash = [] (char ch) {
+    return ch == '/';
+  };
+  if ((context_.flags & URL_FLAGS_HAS_HOST) &&
+      context_.host.length() > 0) {
+    return "";
+  }
+#endif
+  std::string decoded_path;
+  for (std::string& part : context_.path) {
+    std::string decoded;
+    PercentDecode(part.c_str(), part.length(), &decoded);
+    for (char& ch : decoded) {
+      if (is_slash(ch)) {
+        return "";
+      }
+    }
+    decoded_path += slash + decoded;
+  }
+
+#ifdef _WIN32
+  // TODO(TimothyGu): Use "\\?\" long paths on Windows.
+
+  // If hostname is set, then we have a UNC path. Pass the hostname through
+  // ToUnicode just in case it is an IDN using punycode encoding. We do not
+  // need to worry about percent encoding because the URL parser will have
+  // already taken care of that for us. Note that this only causes IDNs with an
+  // appropriate `xn--` prefix to be decoded.
+  if ((context_.flags & URL_FLAGS_HAS_HOST) &&
+      context_.host.length() > 0) {
+    std::string unicode_host;
+    if (!ToUnicode(&context_.host, &unicode_host)) {
+      return "";
+    }
+    return "\\\\" + unicode_host + decoded_path;
+  }
+  // Otherwise, it's a local path that requires a drive letter.
+  if (decoded_path.length() < 3) {
+    return "";
+  }
+  if (decoded_path[2] != ':' ||
+      !IsASCIIAlpha(decoded_path[1])) {
+    return "";
+  }
+  // Strip out the leading '\'.
+  return decoded_path.substr(1);
+#else
+  return decoded_path;
+#endif
+}
+
 // This function works by calling out to a JS function that creates and
 // returns the JS URL object. Be mindful of the JS<->Native boundary
 // crossing that is required.