/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISystemProxySettings.h"
#include "mozilla/ModuleUtils.h"
#include "nsIServiceManager.h"
#include "nsIURI.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsNetCID.h"
#include "nspr.h"

extern "C" {
#include <proxy.h>
}

class nsUnixSystemProxySettings : public nsISystemProxySettings {
public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSISYSTEMPROXYSETTINGS

  nsUnixSystemProxySettings() { mProxyFactory = nullptr; }
  nsresult Init();

private:
  ~nsUnixSystemProxySettings() {
    if (mProxyFactory) 
      px_proxy_factory_free(mProxyFactory); 
  }

  pxProxyFactory *mProxyFactory;
};

NS_IMPL_ISUPPORTS(nsUnixSystemProxySettings, nsISystemProxySettings)

NS_IMETHODIMP
nsUnixSystemProxySettings::GetMainThreadOnly(bool *aMainThreadOnly)
{
  *aMainThreadOnly = false;
  return NS_OK;
}

nsresult
nsUnixSystemProxySettings::Init()
{
  return NS_OK;
}

nsresult
nsUnixSystemProxySettings::GetPACURI(nsACString& aResult)
{
  // Make sure we return an empty result.
  aResult.Truncate();
  return NS_OK;
}

nsresult
nsUnixSystemProxySettings::GetProxyForURI(const nsACString & aSpec,
                                          const nsACString & aScheme,
                                          const nsACString & aHost,
                                          const int32_t      aPort,
                                          nsACString & aResult)
{
  nsresult rv;

  if (!mProxyFactory) {
    mProxyFactory = px_proxy_factory_new();
  }
  NS_ENSURE_TRUE(mProxyFactory, NS_ERROR_NOT_AVAILABLE);

  char **proxyArray = nullptr;
  proxyArray = px_proxy_factory_get_proxies(mProxyFactory,
                                            PromiseFlatCString(aSpec).get());
  NS_ENSURE_TRUE(proxyArray, NS_ERROR_NOT_AVAILABLE);

  // Translate libproxy's output to PAC string as expected
  // libproxy returns an array of proxies in the format:
  // <procotol>://[username:password@]proxy:port
  // or
  // direct://
  //
  // PAC format: "PROXY proxy1.foo.com:8080; PROXY proxy2.foo.com:8080; DIRECT"
  // but nsISystemProxySettings allows "PROXY http://proxy.foo.com:8080" as well.

  int c = 0;
  while (proxyArray[c] != nullptr) {
    if (!aResult.IsEmpty()) {
      aResult.AppendLiteral("; ");
    }

    // figure out the scheme, and we can't use nsIIOService::NewURI because
    // this is not the main thread.
    char *colon = strchr (proxyArray[c], ':');
    uint32_t schemelen = colon ? colon - proxyArray[c] : 0;
    if (schemelen < 1) {
      c++;
      continue;
    }

    if (schemelen == 6 && !strncasecmp(proxyArray[c], "direct", 6)) {
      aResult.AppendLiteral("DIRECT");
    }
    else {
      aResult.AppendLiteral("PROXY ");
      aResult.Append(proxyArray[c]);
    }

    c++;
  }

  PR_Free(proxyArray);
  return NS_OK;
}

#define NS_UNIXSYSTEMPROXYSERVICE_CID  /* 0fa3158c-d5a7-43de-9181-a285e74cf1d4 */\
     { 0x0fa3158c, 0xd5a7, 0x43de, \
       {0x91, 0x81, 0xa2, 0x85, 0xe7, 0x4c, 0xf1, 0xd4 } }

NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsUnixSystemProxySettings, Init)
NS_DEFINE_NAMED_CID(NS_UNIXSYSTEMPROXYSERVICE_CID);

static const mozilla::Module::CIDEntry kUnixProxyCIDs[] = {
  { &kNS_UNIXSYSTEMPROXYSERVICE_CID, false, nullptr, nsUnixSystemProxySettingsConstructor },
  { nullptr }
};

static const mozilla::Module::ContractIDEntry kUnixProxyContracts[] = {
  { NS_SYSTEMPROXYSETTINGS_CONTRACTID, &kNS_UNIXSYSTEMPROXYSERVICE_CID },
  { nullptr }
};

static const mozilla::Module kUnixProxyModule = {
  mozilla::Module::kVersion,
  kUnixProxyCIDs,
  kUnixProxyContracts
};
        
NSMODULE_DEFN(nsUnixProxyModule) = &kUnixProxyModule;