dnl Licensed to the Apache Software Foundation (ASF) under one or more

dnl contributor license agreements.  See the NOTICE file distributed with

dnl this work for additional information regarding copyright ownership.

dnl The ASF licenses this file to You under the Apache License, Version 2.0

dnl (the "License"); you may not use this file except in compliance with

dnl the License.  You may obtain a copy of the License at

dnl

dnl      http://www.apache.org/licenses/LICENSE-2.0

dnl

dnl Unless required by applicable law or agreed to in writing, software

dnl distributed under the License is distributed on an "AS IS" BASIS,

dnl WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

dnl See the License for the specific language governing permissions and

dnl limitations under the License.

dnl #  start of module specific part

APACHE_MODPATH_INIT(http2)

dnl #  list of module object files

http2_objs="dnl

mod_http2.lo dnl

h2_alt_svc.lo dnl

h2_bucket_beam.lo dnl

h2_bucket_eos.lo dnl

h2_config.lo dnl

h2_conn.lo dnl

h2_conn_io.lo dnl

h2_ctx.lo dnl

h2_filter.lo dnl

h2_from_h1.lo dnl

h2_h2.lo dnl

h2_headers.lo dnl

h2_mplx.lo dnl

h2_ngn_shed.lo dnl

h2_push.lo dnl

h2_request.lo dnl

h2_session.lo dnl

h2_stream.lo dnl

h2_switch.lo dnl

h2_task.lo dnl

h2_util.lo dnl

h2_workers.lo dnl

"

dnl

dnl APACHE_CHECK_NGHTTP2

dnl

dnl Configure for nghttp2, giving preference to

dnl "--with-nghttp2=<path>" if it was specified.

dnl

AC_DEFUN([APACHE_CHECK_NGHTTP2],[

  AC_CACHE_CHECK([for nghttp2], [ac_cv_nghttp2], [

    dnl initialise the variables we use

    ac_cv_nghttp2=no

    ap_nghttp2_found=""

    ap_nghttp2_base=""

    ap_nghttp2_libs=""

    dnl Determine the nghttp2 base directory, if any

    AC_MSG_CHECKING([for user-provided nghttp2 base directory])

    AC_ARG_WITH(nghttp2, APACHE_HELP_STRING(--with-nghttp2=PATH, nghttp2 installation directory), [

      dnl If --with-nghttp2 specifies a directory, we use that directory

      if test "x$withval" != "xyes" -a "x$withval" != "x"; then

        dnl This ensures $withval is actually a directory and that it is absolute

        ap_nghttp2_base="`cd $withval ; pwd`"

      fi

    ])

    if test "x$ap_nghttp2_base" = "x"; then

      AC_MSG_RESULT(none)

    else

      AC_MSG_RESULT($ap_nghttp2_base)

    fi

    dnl Run header and version checks

    saved_CPPFLAGS="$CPPFLAGS"

    saved_LIBS="$LIBS"

    saved_LDFLAGS="$LDFLAGS"

    dnl Before doing anything else, load in pkg-config variables

    if test -n "$PKGCONFIG"; then

      saved_PKG_CONFIG_PATH="$PKG_CONFIG_PATH"

      AC_MSG_CHECKING([for pkg-config along $PKG_CONFIG_PATH])

      if test "x$ap_nghttp2_base" != "x" ; then

        if test -f "${ap_nghttp2_base}/lib/pkgconfig/libnghttp2.pc"; then

          dnl Ensure that the given path is used by pkg-config too, otherwise

          dnl the system libnghttp2.pc might be picked up instead.

          PKG_CONFIG_PATH="${ap_nghttp2_base}/lib/pkgconfig${PKG_CONFIG_PATH+:}${PKG_CONFIG_PATH}"

          export PKG_CONFIG_PATH

        elif test -f "${ap_nghttp2_base}/lib64/pkgconfig/libnghttp2.pc"; then

          dnl Ensure that the given path is used by pkg-config too, otherwise

          dnl the system libnghttp2.pc might be picked up instead.

          PKG_CONFIG_PATH="${ap_nghttp2_base}/lib64/pkgconfig${PKG_CONFIG_PATH+:}${PKG_CONFIG_PATH}"

          export PKG_CONFIG_PATH

        fi

      fi

      AC_ARG_ENABLE(nghttp2-staticlib-deps,APACHE_HELP_STRING(--enable-nghttp2-staticlib-deps,[link mod_http2 with dependencies of libnghttp2's static libraries (as indicated by "pkg-config --static"). Must be specified in addition to --enable-http2.]), [

        if test "$enableval" = "yes"; then

          PKGCONFIG_LIBOPTS="--static"

        fi

      ])

      ap_nghttp2_libs="`$PKGCONFIG $PKGCONFIG_LIBOPTS --libs-only-l --silence-errors libnghttp2`"

      if test $? -eq 0; then

        ap_nghttp2_found="yes"

        pkglookup="`$PKGCONFIG --cflags-only-I libnghttp2`"

        APR_ADDTO(CPPFLAGS, [$pkglookup])

        APR_ADDTO(MOD_CFLAGS, [$pkglookup])

        pkglookup="`$PKGCONFIG $PKGCONFIG_LIBOPTS --libs-only-L libnghttp2`"

        APR_ADDTO(LDFLAGS, [$pkglookup])

        APR_ADDTO(MOD_LDFLAGS, [$pkglookup])

        pkglookup="`$PKGCONFIG $PKGCONFIG_LIBOPTS --libs-only-other libnghttp2`"

        APR_ADDTO(LDFLAGS, [$pkglookup])

        APR_ADDTO(MOD_LDFLAGS, [$pkglookup])

      fi

      PKG_CONFIG_PATH="$saved_PKG_CONFIG_PATH"

    fi

    dnl fall back to the user-supplied directory if not found via pkg-config

    if test "x$ap_nghttp2_base" != "x" -a "x$ap_nghttp2_found" = "x"; then

      APR_ADDTO(CPPFLAGS, [-I$ap_nghttp2_base/include])

      APR_ADDTO(MOD_CFLAGS, [-I$ap_nghttp2_base/include])

      APR_ADDTO(LDFLAGS, [-L$ap_nghttp2_base/lib])

      APR_ADDTO(MOD_LDFLAGS, [-L$ap_nghttp2_base/lib])

      if test "x$ap_platform_runtime_link_flag" != "x"; then

        APR_ADDTO(LDFLAGS, [$ap_platform_runtime_link_flag$ap_nghttp2_base/lib])

        APR_ADDTO(MOD_LDFLAGS, [$ap_platform_runtime_link_flag$ap_nghttp2_base/lib])

      fi

    fi

    AC_MSG_CHECKING([for nghttp2 version >= 1.2.1])

    AC_TRY_COMPILE([#include <nghttp2/nghttp2ver.h>],[

#if !defined(NGHTTP2_VERSION_NUM)

#error "Missing nghttp2 version"

#endif

#if NGHTTP2_VERSION_NUM < 0x010201

#error "Unsupported nghttp2 version " NGHTTP2_VERSION_TEXT

#endif],

      [AC_MSG_RESULT(OK)

       ac_cv_nghttp2=yes],

      [AC_MSG_RESULT(FAILED)])

    if test "x$ac_cv_nghttp2" = "xyes"; then

      ap_nghttp2_libs="${ap_nghttp2_libs:--lnghttp2} `$apr_config --libs`"

      APR_ADDTO(MOD_LDFLAGS, [$ap_nghttp2_libs])

      APR_ADDTO(LIBS, [$ap_nghttp2_libs])

      dnl Run library and function checks

      liberrors=""

      AC_CHECK_HEADERS([nghttp2/nghttp2.h])

      AC_CHECK_FUNCS([nghttp2_session_server_new2], [], [liberrors="yes"])

      if test "x$liberrors" != "x"; then

        AC_MSG_WARN([nghttp2 library is unusable])

      fi

dnl # nghttp2 >= 1.3.0: access to stream weights

      AC_CHECK_FUNCS([nghttp2_stream_get_weight], [], [liberrors="yes"])

      if test "x$liberrors" != "x"; then

        AC_MSG_WARN([nghttp2 version >= 1.3.0 is required])

      fi

dnl # nghttp2 >= 1.5.0: changing stream priorities

      AC_CHECK_FUNCS([nghttp2_session_change_stream_priority], 

        [APR_ADDTO(MOD_CPPFLAGS, ["-DH2_NG2_CHANGE_PRIO"])], [])

dnl # nghttp2 >= 1.14.0: invalid header callback

      AC_CHECK_FUNCS([nghttp2_session_callbacks_set_on_invalid_header_callback], 

        [APR_ADDTO(MOD_CPPFLAGS, ["-DH2_NG2_INVALID_HEADER_CB"])], [])

dnl # nghttp2 >= 1.15.0: get/set stream window sizes

      AC_CHECK_FUNCS([nghttp2_session_get_stream_local_window_size], 

        [APR_ADDTO(MOD_CPPFLAGS, ["-DH2_NG2_LOCAL_WIN_SIZE"])], [])

    else

      AC_MSG_WARN([nghttp2 version is too old])

    fi

    dnl restore

    CPPFLAGS="$saved_CPPFLAGS"

    LIBS="$saved_LIBS"

    LDFLAGS="$saved_LDFLAGS"

  ])

  if test "x$ac_cv_nghttp2" = "xyes"; then

    AC_DEFINE(HAVE_NGHTTP2, 1, [Define if nghttp2 is available])

  fi

])

dnl # hook module into the Autoconf mechanism (--enable-http2)

APACHE_MODULE(http2, [HTTP/2 protocol handling in addition to HTTP protocol 

handling. Implemented by mod_http2. This module requires a libnghttp2 installation. 

See --with-nghttp2 on how to manage non-standard locations. This module

is usually linked shared and requires loading. ], $http2_objs, , most, [

    APACHE_CHECK_OPENSSL

    if test "$ac_cv_openssl" = "yes" ; then

        APR_ADDTO(MOD_CPPFLAGS, ["-DH2_OPENSSL"])

    fi

    APACHE_CHECK_NGHTTP2

    if test "$ac_cv_nghttp2" = "yes" ; then

        if test "x$enable_http2" = "xshared"; then

           # The only symbol which needs to be exported is the module

           # structure, so ask libtool to hide everything else:

           APR_ADDTO(MOD_HTTP2_LDADD, [-export-symbols-regex http2_module])

        fi

    else

        enable_http2=no

    fi

])

# Ensure that other modules can pick up mod_http2.h

# icing: hold back for now until it is more stable

#APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])

dnl #  list of module object files

proxy_http2_objs="dnl

mod_proxy_http2.lo dnl

h2_proxy_session.lo dnl

h2_proxy_util.lo dnl

"

dnl # hook module into the Autoconf mechanism (--enable-proxy_http2)

APACHE_MODULE(proxy_http2, [HTTP/2 proxy module. This module requires a libnghttp2 installation. 

See --with-nghttp2 on how to manage non-standard locations. Also requires --enable-proxy.], $proxy_http2_objs, , no, [

    APACHE_CHECK_NGHTTP2

    if test "$ac_cv_nghttp2" = "yes" ; then

        if test "x$enable_http2" = "xshared"; then

           # The only symbol which needs to be exported is the module

           # structure, so ask libtool to hide everything else:

           APR_ADDTO(MOD_PROXY_HTTP2_LDADD, [-export-symbols-regex proxy_http2_module])

        fi

    else

        enable_proxy_http2=no

    fi

], proxy)

dnl #  end of module specific part

APACHE_MODPATH_FINISH