#!/bin/bash
#
# libssl and libcrypto (OpenSSL or derivate) support, with installer.
# Requires OpenSSL version v1.0.1 or later.
#
# Usage:
#   mkl_require libssl
#

# And then call the following function from the correct place/order in checks:
#   mkl_check libssl
#
#
# This module is a bit hacky since OpenSSL provides both libcrypto and libssl,
# the latter depending on the former, but from a user perspective it is
# SSL that is the feature, not crypto.

mkl_toggle_option "Feature" ENABLE_SSL "--enable-ssl" "Enable SSL support" "try"


function manual_checks {
    case "$ENABLE_SSL" in
        n) return 0 ;;
        y) local action=fail ;;
        try) local action=disable ;;
        *) mkl_err "mklove internal error: invalid value for ENABLE_SSL: $ENABLE_SSL"; exit 1 ;;
    esac

    if [[ $MKL_SOURCE_DEPS_ONLY != y && $MKL_DISTRO == "osx" ]]; then
        # Add brew's OpenSSL pkg-config path on OSX
        # to avoid picking up the outdated system-provided openssl/libcrypto.
        mkl_env_append PKG_CONFIG_PATH "/usr/local/opt/openssl/lib/pkgconfig" ":"
	# and similar path for M1 brew location
        mkl_env_append PKG_CONFIG_PATH "/opt/homebrew/opt/openssl/lib/pkgconfig" ":"
    fi

    # OpenSSL provides both libcrypto and libssl
    if [[ $WITH_STATIC_LINKING != y ]]; then
        # Debian's OpenSSL static libraries are broken.
        mkl_meta_set "libcrypto" "deb" "libssl-dev"
    fi
    mkl_meta_set "libcrypto" "rpm" "openssl-devel"
    mkl_meta_set "libcrypto" "brew" "openssl"
    mkl_meta_set "libcrypto" "apk" "openssl-dev"
    mkl_meta_set "libcrypto" "static" "libcrypto.a"

    if ! mkl_lib_check "libcrypto" "" $action CC "-lcrypto" "
#include <openssl/ssl.h>
#include <openssl/evp.h>
#if OPENSSL_VERSION_NUMBER < 0x1000100fL
#error \"Requires OpenSSL version >= v1.0.1\"
#endif"; then
        return
    fi


    #
    # libssl
    #
    mkl_meta_set "libssl" "static" "libssl.a"

    if [[ $(mkl_meta_get "libcrypto" "installed_with") == "source" ]]; then
        # Try to resolve the libssl.a static library path based on the
        # libcrypto (openssl) install path.
        mkl_resolve_static_libs "libssl" "$(mkl_dep_destdir libcrypto)"
    fi

    mkl_lib_check "libssl" "WITH_SSL" $action CC "-lssl -lcrypto" \
                  "#include <openssl/ssl.h>
#if OPENSSL_VERSION_NUMBER < 0x1000100fL
#error \"Requires OpenSSL version >= v1.0.1\"
#endif"

    # Silence OpenSSL 3.0.0 deprecation warnings since they'll make
    # -Werror fail.
    if ! mkl_compile_check --sub "libcrypto" "" "" CC "-lcrypto" "
#include <openssl/ssl.h>
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#error \"OpenSSL version >= v3.0.0 needs OPENSSL_SUPPRESS_DEPRECATED\"
#endif"; then
            mkl_define_set "libcrypto" OPENSSL_SUPPRESS_DEPRECATED
    fi
}


    # Install libcrypto/libssl from source tarball on linux.
    #
    # Param 1: name (libcrypto)
    # Param 2: install-dir-prefix (e.g., DESTDIR)
    # Param 2: version (optional)
function libcrypto_install_source {
    local name=$1
    local destdir=$2
    local ver=3.0.8
    local checksum="6c13d2bf38fdf31eac3ce2a347073673f5d63263398f1f69d0df4a41253e4b3e"
    local url=https://www.openssl.org/source/openssl-${ver}.tar.gz

    local conf_args="--prefix=/usr --openssldir=/usr/lib/ssl no-shared no-zlib"

    if [[ $ver == 1.0.* ]]; then
        conf_args="${conf_args} no-krb5"
    fi

    if [[ $ver != 3.* ]]; then
        # OpenSSL 3 deprecates ENGINE support, but we still need it, so only
        # add no-deprecated to non-3.x builds.
        conf_args="${conf_args} no-deprecated"
    fi

    # 1.1.1q tests fail to build on OSX/M1, so disable them.
    if [[ $MKL_DISTRO == osx && $ver == 1.1.1q ]]; then
        conf_args="${conf_args} no-tests"
    fi

    echo "### Installing $name $ver from source ($url) to $destdir"
    if [[ ! -f config ]]; then
        echo "### Downloading"
        mkl_download_archive "$url" "256" "$checksum" || return 1
    fi

    if [[ $MKL_DISTRO == "osx" ]]; then
        # Workaround build issue in 1.1.1l on OSX with older toolchains.
        if [[ $ver == 1.1.1l ]]; then
            if ! mkl_patch libssl 0000 ; then
                return 1
            fi
        fi

        # Silence a load of warnings on OSX
        conf_args="${conf_args} -Wno-nullability-completeness"
    fi

    echo "### Configuring with args $conf_args"
    ./config $conf_args || return $?

    echo "### Building"
    make

    echo "### Installing to $destdir"
    if [[ $ver == 1.0.* ]]; then
        make INSTALL_PREFIX="$destdir" install_sw
    else
        make DESTDIR="$destdir" install
    fi

    return $?
}