Method parse

3rdparty/libprocess/src/http.cpp:232–292

Try<URL> URL::parse(const string& urlString)
{
  // TODO(tnachen): Consider using C++11 regex support instead.

  size_t schemePos = urlString.find("://");
  if (schemePos == string::npos) {
    return Error("Missing scheme in url string");
  }

  const string scheme = strings::lower(urlString.substr(0, schemePos));
  const string urlPath = urlString.substr(schemePos + 3);

  size_t pathPos = urlPath.find_first_of('/');
  if (pathPos == 0) {
    return Error("Host not found in url");
  }

  // If path is specified in the URL, try to capture the host and path
  // separately.
  string host = urlPath;
  string path = "/";
  if (pathPos != string::npos) {
    host = host.substr(0, pathPos);
    path = urlPath.substr(pathPos);
  }

  if (host.empty()) {
    return Error("Host not found in url");
  }

  const vector<string> tokens = strings::tokenize(host, ":");

  if (tokens[0].empty()) {
    return Error("Host not found in url");
  }

  if (tokens.size() > 2) {
    return Error("Found multiple ports in url");
  }

  Option<uint16_t> port;
  if (tokens.size() == 2) {
    Try<uint16_t> numifyPort = numify<uint16_t>(tokens[1]);
    if (numifyPort.isError()) {
      return Error("Failed to parse port: " + numifyPort.error());
    }

    port = numifyPort.get();
  } else {
    // Attempt to resolve the port based on the URL scheme.
    port = defaultPort(scheme);
  }

  if (port.isNone()) {
    return Error("Unable to determine port from url");
  }

  // TODO(tnachen): Support parsing query and fragment.