gecko-dev/netwerk/base/nsIURIMutator.idl

/* -*- 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 "nsISupports.idl"
interface nsIURI;
interface nsIObjectInputStream;
interface nsIURIMutator;

%{C++
#include "nsString.h"
#include "nsCOMPtr.h"
#include <functional>

#undef SetPort  // XXX Windows!

namespace mozilla {
class Encoding;
}

namespace mozilla {
namespace ipc {
class URIParams;
} // namespace ipc
} // namespace mozilla

template <class T>
class BaseURIMutator
{
// This is the base class that can be extended by implementors of nsIURIMutator
// in order to avoid code duplication
// Class type T should be the type of the class that implements nsIURI
protected:
  virtual T* Create()
  {
    return new T();
  }

  MOZ_MUST_USE nsresult InitFromURI(T* aURI)
  {
    nsCOMPtr<nsIURI> clone;
    nsresult rv = aURI->Clone(getter_AddRefs(clone));
    if (NS_FAILED(rv)) {
      return rv;
    }
    mURI = static_cast<T*>(clone.get());
    return NS_OK;
  }

  MOZ_MUST_USE nsresult InitFromInputStream(nsIObjectInputStream* aStream)
  {
    RefPtr<T> uri = Create();
    nsresult rv = uri->ReadPrivate(aStream);
    if (NS_FAILED(rv)) {
      return rv;
    }
    mURI = uri.forget();
    return NS_OK;
  }

  MOZ_MUST_USE nsresult InitFromIPCParams(const mozilla::ipc::URIParams& aParams)
  {
    RefPtr<T> uri = Create();
    bool ret = uri->Deserialize(aParams);
    if (!ret) {
      return NS_ERROR_FAILURE;
    }
    mURI = uri.forget();
    return NS_OK;
  }

  MOZ_MUST_USE nsresult InitFromSpec(const nsACString& aSpec)
  {
    nsresult rv = NS_OK;
    RefPtr<T> uri;
    if (mURI) {
      // This only works because all other Init methods create a new object
      mURI.swap(uri);
    } else {
      uri = Create();
    }

    rv = uri->SetSpecInternal(aSpec);
    if (NS_FAILED(rv)) {
      return rv;
    }
    mURI = uri.forget();
    return NS_OK;
  }

  RefPtr<T> mURI;
};

// Since most implementations of nsIURIMutator would extend BaseURIMutator,
// some methods would have the same implementation. We provide a useful macro
// to avoid code duplication.
#define NS_DEFINE_NSIMUTATOR_COMMON                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  Deserialize(const mozilla::ipc::URIParams& aParams) override                \
  {                                                                           \
    return InitFromIPCParams(aParams);                                        \
  }                                                                           \
                                                                              \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  Finalize(nsIURI** aURI) override                                            \
  {                                                                           \
    mURI.forget(aURI); return NS_OK;                                          \
  }                                                                           \
                                                                              \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetSpec(const nsACString& aSpec, nsIURIMutator** aMutator) override         \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return InitFromSpec(aSpec);                                               \
  }                                                                           \

// Implements AddRef, Release and QueryInterface for the mutator
#define NS_IMPL_NSIURIMUTATOR_ISUPPORTS(aClass, ...)                          \
  NS_IMPL_ADDREF(aClass)                                                      \
  NS_IMPL_RELEASE(aClass)                                                     \
  NS_IMPL_NSIURIMUTATOR_QUERY_INTERFACE(aClass, __VA_ARGS__)                  \

// The list of interfaces is queried and an AddRef-ed pointer is returned if
// there is a match. Otherwise, we call QueryInterface on mURI and return.
// The reason for this specialized QueryInterface implementation is that we
// we want to be able to instantiate the mutator for a given CID of a
// nsIURI implementation, call nsISerializable.Read() on the mutator to
// deserialize the URI then QueryInterface the mutator to an nsIURI interface.
// See bug 1442239.
// If you QueryInterface a mutator to an interface of the URI
// implementation this is similar to calling Finalize.
#define NS_IMPL_NSIURIMUTATOR_QUERY_INTERFACE(aClass, ...)                    \
  static_assert(MOZ_ARG_COUNT(__VA_ARGS__) > 0,                               \
                "Need more arguments");                                       \
  NS_INTERFACE_MAP_BEGIN(aClass)                                              \
    nsCOMPtr<nsIURI> uri;                                                     \
    NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIURIMutator)              \
    MOZ_FOR_EACH(NS_INTERFACE_MAP_ENTRY, (), (__VA_ARGS__))                   \
    if (aIID.Equals(NS_GET_IID(nsIClassInfo))) {                              \
      foundInterface = nullptr;                                               \
    } else                                                                    \
    if (mURI &&                                                               \
        NS_SUCCEEDED(mURI->QueryInterface(aIID, getter_AddRefs(uri)))) {      \
        mURI = nullptr;                                                       \
        foundInterface = uri.get();                                           \
    } else                                                                    \
  NS_INTERFACE_MAP_END                                                        \

%}

[ptr] native Encoding(const mozilla::Encoding);
[ref] native const_URIParams_ref(const mozilla::ipc::URIParams);

[scriptable, builtinclass, uuid(1fc53257-898b-4c5e-b69c-05bc84b4cd8f)]
interface nsIURISetSpec : nsISupports
{
  /**
   * This setter is different from all other setters because it may be used to
   * initialize the object. We define it separately allowing mutator implementors
   * to define it separately, while the rest of the setters may be simply
   * forwarded to the mutable URI.
   */
  [must_use] nsIURIMutator setSpec(in AUTF8String aSpec);
};

/**
 * These methods allow the mutator to change various parts of the URI.
 * They return the same nsIURIMutator so that we may chain setter operations:
 * Example:
 * let newURI = uri.mutate()
 *                 .setSpec("http://example.com")
 *                 .setQuery("hello")
 *                 .finalize();
 */
[scriptable, builtinclass, uuid(5403a6ec-99d7-405e-8b45-9f805bbdfcef)]
interface nsIURISetters : nsIURISetSpec
{
  /**
   * Setting the scheme outside of a protocol handler implementation is highly
   * discouraged since that will generally lead to incorrect results.
   */
  [must_use] nsIURIMutator setScheme(in AUTF8String aScheme);
  [must_use] nsIURIMutator setUserPass(in AUTF8String aUserPass);
  [must_use] nsIURIMutator setUsername(in AUTF8String aUsername);
  [must_use] nsIURIMutator setPassword(in AUTF8String aPassword);

  /**
   * If you setHostPort to a value that only has a host part, the port
   * will not be reset. To reset the port set it to -1 beforehand.
   * If setting the host succeeds, this method will return NS_OK, even if
   * setting the port fails (error in parsing the port, or value out of range)
   */
  [must_use] nsIURIMutator setHostPort(in AUTF8String aHostPort);
  [must_use] nsIURIMutator setHost(in AUTF8String aHost);
  [must_use] nsIURIMutator setPort(in long aPort);
  [must_use] nsIURIMutator setPathQueryRef(in AUTF8String aPathQueryRef);
  [must_use] nsIURIMutator setRef(in AUTF8String aRef);
  [must_use] nsIURIMutator setFilePath(in AUTF8String aFilePath);
  [must_use] nsIURIMutator setQuery(in AUTF8String aQuery);
  [must_use, noscript] nsIURIMutator setQueryWithEncoding(in AUTF8String query, in Encoding encoding);
};

%{C++

// Using this macro instead of NS_FORWARD_SAFE_NSIURISETTERS makes chaining
// setter operations possible.
#define NS_FORWARD_SAFE_NSIURISETTERS_RET(_to)                                \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetScheme(const nsACString& aScheme, nsIURIMutator** aMutator) override     \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetScheme(aScheme);            \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetUserPass(const nsACString& aUserPass, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetUserPass(aUserPass);        \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetUsername(const nsACString& aUsername, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetUsername(aUsername);        \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetPassword(const nsACString& aPassword, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetPassword(aPassword);        \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetHostPort(const nsACString& aHostPort, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetHostPort(aHostPort);        \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetHost(const nsACString& aHost, nsIURIMutator** aMutator) override         \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetHost(aHost);                \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetPort(int32_t aPort, nsIURIMutator** aMutator) override                   \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetPort(aPort);                \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetPathQueryRef(const nsACString& aPathQueryRef, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetPathQueryRef(aPathQueryRef); \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetRef(const nsACString& aRef, nsIURIMutator** aMutator) override           \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetRef(aRef);                  \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetFilePath(const nsACString& aFilePath, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetFilePath(aFilePath);        \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetQuery(const nsACString& aQuery, nsIURIMutator** aMutator) override       \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetQuery(aQuery);              \
  }                                                                           \
  MOZ_MUST_USE NS_IMETHOD                                                     \
  SetQueryWithEncoding(const nsACString& query, const mozilla::Encoding *encoding, nsIURIMutator** aMutator) override \
  {                                                                           \
    if (aMutator) NS_ADDREF(*aMutator = this);                                \
    return !_to ? NS_ERROR_NULL_POINTER : _to->SetQueryWithEncoding(query, encoding); \
  }                                                                           \

%}

[scriptable, builtinclass, uuid(4d1f3103-1c44-4dcd-b717-5d22a697a7d9)]
interface nsIURIMutator : nsIURISetters
{
  /**
   * Initalizes the URI by reading IPC URIParams.
   * See nsIURI.
   */
  [noscript, notxpcom, must_use]
  nsresult deserialize(in const_URIParams_ref aParams);

  /**
   * Finishes changing or constructing the URI and returns an immutable URI.
   */
  [must_use]
  nsIURI finalize();
};

%{C++

// This templated struct is used to extract the class type of the method
// passed to NS_MutatorMethod.
template <typename Method>
struct nsMethodTypeTraits;

template <class C, typename R, typename... As>
struct nsMethodTypeTraits<R(C::*)(As...)>
{
  typedef C class_type;
};

#ifdef NS_HAVE_STDCALL
template <class C, typename R, typename... As>
struct nsMethodTypeTraits<R(__stdcall C::*)(As...)>
{
  typedef C class_type;
};
#endif

// This helper returns a std::function that will be applied on the
// nsIURIMutator. The type of `Interface` will be deduced from the method type.
// aMethod will be called on the target object if it successfully QIs to
// `Interface`, and the arguments will be passed to the call.
template <typename Method, typename... Args>
const std::function<nsresult(nsIURIMutator*)>
NS_MutatorMethod(Method aMethod, Args ...aArgs)
{
  // Capture arguments by value, otherwise we crash.
  return [=](nsIURIMutator* aMutator) {
    typedef typename nsMethodTypeTraits<Method>::class_type Interface;
    nsresult rv;
    nsCOMPtr<Interface> target = do_QueryInterface(aMutator, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = (target->*aMethod)(aArgs...);
    if (NS_FAILED(rv)) return rv;
    return NS_OK;
  };
}

// This class provides a useful helper that allows chaining of setter operations
class MOZ_STACK_CLASS NS_MutateURI
{
public:
  explicit NS_MutateURI(nsIURI* aURI);
  explicit NS_MutateURI(const char * aContractID);

  explicit NS_MutateURI(nsIURIMutator* m)
  {
    mStatus = m ? NS_OK : NS_ERROR_NULL_POINTER;
    mMutator = m;
    NS_ENSURE_SUCCESS_VOID(mStatus);
  }

  NS_MutateURI& SetSpec(const nsACString& aSpec)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetSpec(aSpec, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetScheme(const nsACString& aScheme)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetScheme(aScheme, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetUserPass(const nsACString& aUserPass)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetUserPass(aUserPass, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetUsername(const nsACString& aUsername)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetUsername(aUsername, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetPassword(const nsACString& aPassword)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetPassword(aPassword, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetHostPort(const nsACString& aHostPort)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetHostPort(aHostPort, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetHost(const nsACString& aHost)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetHost(aHost, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetPort(int32_t aPort)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetPort(aPort, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetPathQueryRef(const nsACString& aPathQueryRef)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetPathQueryRef(aPathQueryRef, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetRef(const nsACString& aRef)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetRef(aRef, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetFilePath(const nsACString& aFilePath)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetFilePath(aFilePath, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetQuery(const nsACString& aQuery)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetQuery(aQuery, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }
  NS_MutateURI& SetQueryWithEncoding(const nsACString& query, const mozilla::Encoding *encoding)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = mMutator->SetQueryWithEncoding(query, encoding, nullptr);
    NS_ENSURE_SUCCESS(mStatus, *this);
    return *this;
  }

  /**
   * This method allows consumers to call the methods declared in other
   * interfaces implemented by the mutator object.
   *
   * Example:
   * nsCOMPtr<nsIURI> uri;
   * nsresult rv = NS_MutateURI(new URIClass::Mutator())
   *                 .SetSpec(aSpec)
   *                 .Apply(NS_MutatorMethod(&SomeInterface::Method, arg1, arg2))
   *                 .Finalize(uri);
   *
   * If mMutator does not implement SomeInterface, do_QueryInterface will fail
   * and the method will not be called.
   * If aMethod does not exist, or if there is a mismatch between argument
   * types, or the number of arguments, then there will be a compile error.
   */
  NS_MutateURI& Apply(const std::function<nsresult(nsIURIMutator*)>& aFunction)
  {
    if (NS_FAILED(mStatus)) {
      return *this;
    }
    mStatus = aFunction(mMutator);
    return *this;
  }

  template <class C>
  MOZ_MUST_USE nsresult Finalize(nsCOMPtr<C>& aURI)
  {
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    nsCOMPtr<nsIURI> uri;
    mStatus = mMutator->Finalize(getter_AddRefs(uri));
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    aURI = do_QueryInterface(uri, &mStatus);
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    mStatus = NS_ERROR_NOT_AVAILABLE; // Second call to Finalize should fail.
    return NS_OK;
  }

  // Overload for nsIURI to avoid query interface.
  MOZ_MUST_USE nsresult Finalize(nsCOMPtr<nsIURI>& aURI)
  {
    NS_ENSURE_SUCCESS(mStatus, mStatus);
    mStatus = mMutator->Finalize(getter_AddRefs(aURI));
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    mStatus = NS_ERROR_NOT_AVAILABLE; // Second call to Finalize should fail.
    return NS_OK;
  }

  template <class C>
  MOZ_MUST_USE nsresult Finalize(C** aURI)
  {
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    nsCOMPtr<nsIURI> uri;
    mStatus = mMutator->Finalize(getter_AddRefs(uri));
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    nsCOMPtr<C> result = do_QueryInterface(uri, &mStatus);
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    result.forget(aURI);
    mStatus = NS_ERROR_NOT_AVAILABLE; // Second call to Finalize should fail.
    return NS_OK;
  }

  MOZ_MUST_USE nsresult Finalize(nsIURI** aURI)
  {
    if (NS_FAILED(mStatus)) return mStatus;
    mStatus = mMutator->Finalize(aURI);
    NS_ENSURE_SUCCESS(mStatus, mStatus);

    mStatus = NS_ERROR_NOT_AVAILABLE; // Second call to Finalize should fail.
    return NS_OK;
  }

  nsresult GetStatus() { return mStatus; }
private:
  nsresult mStatus;
  nsCOMPtr<nsIURIMutator> mMutator;
};

%}