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# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=6

SSL_CERT_MANDATORY=1

inherit eutils pam rebar ssl-cert systemd

DESCRIPTION="Robust, scalable and extensible XMPP server"
HOMEPAGE="https://www.ejabberd.im/ https://github.com/processone/ejabberd/"
SRC_URI="https://static.process-one.net/${PN}/downloads/${PV}/${P}.tgz
	-> ${P}.tar.gz"

LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~amd64"
REQUIRED_USE="mssql? ( odbc )"
# TODO: Add 'tools' flag.
IUSE="captcha debug full-xml hipe ldap mssql mysql odbc pam postgres redis
	roster-gw sip sqlite stun zlib"

RESTRICT="test"

# TODO: Add dependencies for 'tools' flag enabled.
# TODO: tools? (
# TODO:		>=dev-erlang/luerl-0.3
# TODO: )
DEPEND=">=dev-lang/erlang-19.3[hipe?,odbc?,ssl]
	>=dev-erlang/cache_tab-1.0.22
	>=dev-erlang/eimp-1.0.14
	>=dev-erlang/fast_tls-1.1.4
	>=dev-erlang/fast_xml-1.1.39
	>=dev-erlang/fast_yaml-1.0.24
	>=dev-erlang/yconf-1.0.4
	>=dev-erlang/jiffy-1.0.1
	>=dev-erlang/jose-1.9.0
	>=dev-erlang/lager-3.6.10
	>=dev-erlang/p1_oauth2-0.6.6
	>=dev-erlang/p1_utils-1.0.18
	>=dev-erlang/stringprep-1.0.19
	>=dev-erlang/xmpp-1.4.5
	>=dev-erlang/pkix-1.0.5
	>=dev-erlang/mqtree-1.0.7
	>=dev-erlang/idna-6.0.0
	>=dev-erlang/p1_acme-1.0.5
	>=dev-erlang/base64url-1.0
	>=net-im/jabber-base-0.01
	ldap? ( =net-nds/openldap-2* )
	mysql? ( >=dev-erlang/p1_mysql-1.0.14 )
	odbc? ( dev-db/unixODBC )
	pam? ( >=dev-erlang/epam-1.0.7 )
	postgres? ( >=dev-erlang/p1_pgsql-1.1.9 )
	redis? ( >=dev-erlang/eredis-1.0.8 )
	sip? ( >=dev-erlang/esip-1.0.32 )
	sqlite? ( >=dev-erlang/sqlite3-1.1.6 )
	stun? ( >=dev-erlang/stun-1.0.31 )
	zlib? ( >=dev-erlang/ezlib-1.0.7 )"
RDEPEND="${DEPEND}
	captcha? ( media-gfx/imagemagick[truetype,png] )"

DOCS=( CHANGELOG.md README.md )
PATCHES=( "${FILESDIR}/${PN}-19.08-ejabberdctl.patch"
	"${FILESDIR}/${PN}-19.08-0002-Dont-overwrite-service-file.patch")

EJABBERD_CERT="${EPREFIX}/etc/ssl/ejabberd/server.pem"
# Paths in net-im/jabber-base
JABBER_ETC="${EPREFIX}/etc/jabber"
JABBER_LOG="${EPREFIX}/var/log/jabber"
JABBER_SPOOL="${EPREFIX}/var/spool/jabber"

# Adjust example configuration file to Gentoo.
# - Use our sample certificate.
adjust_config() {
	sed -rne "/^#?\s+certfiles:/{p;a\  - ${EJABBERD_CERT}" -e ":a;n;/^#?\s+-/ba};p" \
		-i "${S}/ejabberd.yml.example" \
		|| die 'failed to adjust example config'
	sed -re 's/^#\s+(certfiles)/\1/' \
		-i "${S}/ejabberd.yml.example" \
		|| die 'failed to adjust example config'
}

# Set paths to ejabberd lib directory consistently to point always to directory
# suffixed with version.
correct_ejabberd_paths() {
	sed -e "/^EJABBERDDIR[[:space:]]*=/{s:ejabberd:${P}:}" \
		-i "${S}/Makefile.in" \
		|| die 'failed to set ejabberd path in Makefile.in'
	sed -e "/EJABBERD_BIN_PATH=/{s:ejabberd:${P}:}" \
		-i "${S}/ejabberdctl.template" \
		|| die 'failed to set ejabberd path in ejabberdctl.template'
}

# Get epam-wrapper from 'files' directory and correct path to lib directory in
# it. epam-wrapper is placed into work directory. It is assumed no epam-wrapper
# file exists there already.
customize_epam_wrapper() {
	local epam_wrapper_src="$1"
	local epam_wrapper_dst="${S}/epam-wrapper"

	[[ -e ${epam_wrapper_dst} ]] && die 'epam-wrapper already exists'
	sed -r -e "s@^(ERL_LIBS=).*\$@\1${EPREFIX}$(get_erl_libs)@" \
		"${epam_wrapper_src}" >"${epam_wrapper_dst}" \
		|| die 'failed to install epam-wrapper'
}

# Check if we are missing a default certificate.
ejabberd_cert_missing() {
	if grep -qs "^\s\+- ${EJABBERD_CERT}" "${EROOT%/}${JABBER_ETC}/ejabberd.yml"; then
		if [[ -f "${EROOT%/}${EJABBERD_CERT}" ]]; then
			# default certificate is present in config and exists - not installing
			return 1
		else
			# default certificate is present in config
			# but doesn't exist - need to install one
			return 0
		fi
	fi
	# no default certificate in config - not installing
	return 1
}

# Generate and install sample ejabberd certificate. It's installed into
# EJABBERD_CERT path.
ejabberd_cert_install() {
	SSL_ORGANIZATION="${SSL_ORGANIZATION:-ejabberd XMPP Server}"
	install_cert "${EJABBERD_CERT%.*}"
	chown root:jabber "${EROOT%/}${EJABBERD_CERT}" || die
	chmod 0440 "${EROOT%/}${EJABBERD_CERT}" || die
}

# Get path to ejabberd lib directory.
#
# This is the path ./configure script Base for this path is path set in
# ./configure script which is /usr/lib by default. If libdir is explicitely set
# to something else than this should be adjusted here as well.
get_ejabberd_path() {
	echo "/usr/$(get_libdir)/${P}"
}

# Make ejabberd.service for systemd from upstream provided template.
make_ejabberd_service() {
	sed -r \
		-e 's!@ctlscriptpath@!/usr/sbin!g' \
		-e 's!^(User|Group)=(.*)!\1=jabber!' \
		-e 's!^(After)=(.*)!\1=epmd.service network.target!' \
		-e '/^After=/ a Requires=epmd.service' \
		"${PN}.service.template" >"${PN}.service" \
		|| die 'failed to make ejabberd.service'
}

# Set paths to defined by net-im/jabber-base.
set_jabberbase_paths() {
	sed -e "/^ETCDIR[[:space:]]*=/{s:@sysconfdir@/ejabberd:${JABBER_ETC}:}" \
		-e "/^LOGDIR[[:space:]]*=/{s:@localstatedir@/log/ejabberd:${JABBER_LOG}:}" \
		-e "/^SPOOLDIR[[:space:]]*=/{s:@localstatedir@/lib/ejabberd:${JABBER_SPOOL}:}" \
		-i "${S}/Makefile.in" \
		|| die 'failed to set paths in Makefile.in'
	sed -e "s|\(ETC_DIR:=\"\){{sysconfdir}}[^\"]*|\1${JABBER_ETC}|" \
		-e "s|\(LOGS_DIR:=\"\){{localstatedir}}[^\"]*|\1${JABBER_LOG}|" \
		-e "s|\(SPOOL_DIR:=\"\){{localstatedir}}[^\"]*|\1${JABBER_SPOOL}|" \
		-i "${S}/ejabberdctl.template" \
		|| die 'failed to set paths ejabberdctl.template'
}

# Skip installing docs because it's only COPYING that's installed by Makefile.
skip_docs() {
	gawk -i inplace '
/# Documentation/, /^[[:space:]]*#?[[:space:]]*$/ {
	if ($0 ~ /^[[:space:]]*#?[[:space:]]*$/) {
		print $0;
	} else {
		next;
	}
}
1
' "${S}/Makefile.in" || die 'failed to remove docs section from Makefile.in'
}

src_prepare() {
	default

	rebar_remove_deps
	correct_ejabberd_paths
	set_jabberbase_paths
	make_ejabberd_service
	skip_docs
	adjust_config
	customize_epam_wrapper "${FILESDIR}/epam-wrapper"

	rebar_fix_include_path fast_xml
	rebar_fix_include_path p1_utils
	rebar_fix_include_path xmpp

	# Fix bug #591862. ERL_LIBS should point directly to ejabberd directory
	# rather than its parent which is default. That way ejabberd directory
	# takes precedence is module lookup.
	local ejabberd_erl_libs="$(get_ejabberd_path):$(get_erl_libs)"
	sed -e "s|\(ERL_LIBS=\){{libdir}}.*|\1${ejabberd_erl_libs}|" \
		-i "${S}/ejabberdctl.template" \
		|| die 'failed to set ERL_LIBS in ejabberdctl.template'

	sed -e "s|\(AC_INIT(ejabberd, \)m4_esyscmd([^)]*)|\1[$PV]|" \
		-i configure.ac || die "Failed to write correct version to configure"
	# eautoreconf # required in case of download from github
}

src_configure() {
	econf \
		--docdir="${EPREFIX}/usr/share/doc/${PF}/html" \
		--enable-user=jabber \
		--disable-system-deps \
		$(use_enable debug) \
		$(use_enable full-xml) \
		$(use_enable hipe) \
		$(use_enable mssql) \
		$(use_enable mysql) \
		$(use_enable odbc) \
		$(use_enable pam) \
		$(use_enable postgres pgsql) \
		$(use_enable redis) \
		$(use_enable roster-gw roster-gateway-workaround) \
		$(use_enable sqlite) \
		$(use_enable sip) \
		$(use_enable stun) \
		$(use_enable zlib)

	# more options to support
	# --enable-elixir requires https://github.com/elixir-lang/elixir
}

src_compile() {
	emake REBAR='rebar -v' src
}

src_install() {
	default

	keepdir /var/lib/lock/ejabberdctl
	rm -rf "${ED%/}/var/log" || die
	rm -rf "${ED%/}/var/spool" || die

	if use pam; then
		local epam_path="$(get_ejabberd_path)/priv/bin/epam"

		pamd_mimic_system xmpp auth account || die "cannot create pam.d file"
		into "$(get_ejabberd_path)/priv"
		newbin epam-wrapper epam
	fi

	newconfd "${FILESDIR}/${PN}.confd" "${PN}"
	newinitd "${FILESDIR}/${PN}.initd" "${PN}"
	systemd_dounit "${PN}.service"
	systemd_dotmpfilesd "${FILESDIR}/${PN}.tmpfiles.conf"

	insinto /etc/logrotate.d
	newins "${FILESDIR}/${PN}.logrotate" "${PN}"
}

pkg_preinst() {
	if use pam; then
		einfo "Adding jabber user to epam group to allow ejabberd to use PAM" \
			"authentication"
		# See
		# <https://docs.ejabberd.im/admin/configuration/#pam-authentication>.
		# epam binary is installed by dev-erlang/epam package, therefore SUID
		# is set by that package. Instead of jabber group it uses epam group,
		# therefore we need to add jabber user to epam group.
		usermod -a -G epam jabber || die
	fi
}

pkg_postinst() {
	if [[ ! ${REPLACING_VERSIONS} ]]; then
		echo
		elog "For configuration instructions, please see"
		elog "  https://docs.ejabberd.im/"
		echo
	fi
	if [[ " ${REPLACING_VERSIONS} " =~ \ 17\. ]]; then
		ewarn If you are updating from an older version like 17.x
		ewarn you may need to add an access_rules section to your
		ewarn ejabberd.yml config file.
		ewarn Otherwise authentication will be broken and users
		ewarn will not be able to log in.
		echo
	fi

	if ejabberd_cert_missing; then
		ejabberd_cert_install
	fi
}