Implement OpenPGP using librpm API

CMakeLists.txt

@@ -5,6 +5,7 @@ OPTION (ENABLE_TESTS "Build test?" ON)
 OPTION (ENABLE_DOCS "Build docs?" ON)
 OPTION (WITH_ZCHUNK "Build with zchunk support" ON)
 OPTION (ENABLE_PYTHON "Build Python bindings" ON)
+OPTION (USE_GPGME "Use GpgMe (instead of rpm library) for OpenPGP key support" ON)
 
 INCLUDE (${CMAKE_SOURCE_DIR}/VERSION.cmake)
 SET (VERSION "${LIBREPO_MAJOR}.${LIBREPO_MINOR}.${LIBREPO_PATCH}")
@@ -32,8 +33,12 @@ PKG_CHECK_MODULES(GLIB2 glib-2.0>=2.66 gio-2.0 REQUIRED)
 PKG_SEARCH_MODULE(LIBCRYPTO REQUIRED libcrypto openssl)
 PKG_CHECK_MODULES(LIBXML2 libxml-2.0 REQUIRED)
 FIND_PACKAGE(CURL 7.52.0 REQUIRED)
-FIND_PACKAGE(Gpgme REQUIRED)
 
+IF (USE_GPGME)
+    FIND_PACKAGE(Gpgme REQUIRED)
+ELSE (USE_GPGME)
+    PKG_CHECK_MODULES(RPM REQUIRED rpm>=4.18.0)
+ENDIF (USE_GPGME)
 
 IF (WITH_ZCHUNK)
 PKG_CHECK_MODULES(ZCHUNKLIB zck>=0.9.11 REQUIRED)

librepo.spec

@@ -8,6 +8,12 @@
 %bcond_without zchunk
 %endif
 
+%if 0%{?fedora} >= 39
+%bcond_with use_gpgme
+%else
+%bcond_without use_gpgme
+%endif
+
 %global dnf_conflict 2.8.8
 
 Name:           librepo
@@ -24,7 +30,11 @@ BuildRequires:  gcc
 BuildRequires:  check-devel
 BuildRequires:  doxygen
 BuildRequires:  pkgconfig(glib-2.0) >= 2.66
+%if %{with use_gpgme}
 BuildRequires:  gpgme-devel
+%else
+BuildRequires:  pkgconfig(rpm) >= 4.18.0
+%endif
 BuildRequires:  libattr-devel
 BuildRequires:  libcurl-devel >= %{libcurl_version}
 BuildRequires:  pkgconfig(libxml-2.0)
@@ -66,7 +76,9 @@ Python 3 bindings for the librepo library.
 %autosetup -p1
 
 %build
-%cmake %{!?with_zchunk:-DWITH_ZCHUNK=OFF}
+%cmake \
+    -DWITH_ZCHUNK=%{?with_zchunk:ON}%{!?with_zchunk:OFF} \
+    -DUSE_GPGME=%{?with_use_gpgme:ON}%{!?with_use_gpgme:OFF}
 %cmake_build
 
 %check

librepo/CMakeLists.txt

@@ -1,4 +1,4 @@
-SET (librepo_SRCS
+LIST(APPEND librepo_SRCS
      checksum.c
      downloader.c
      downloadtarget.c
@@ -20,7 +20,13 @@ SET (librepo_SRCS
      xmlparser.c
      yum.c)
 
-SET(librepo_HEADERS
+IF(USE_GPGME)
+    LIST(APPEND librepo_SRCS gpg_gpgme.c)
+ELSE(USE_GPGME)
+    LIST(APPEND librepo_SRCS gpg_rpm.c)
+ENDIF(USE_GPGME)
+
+LIST(APPEND librepo_HEADERS
     checksum.h
     fastestmirror.h
     gpg.h
@@ -44,10 +50,11 @@ SET(librepo_HEADERS
     downloader.h
     downloadtarget.h)
 
-SET(librepo_internal_HEADERS
+LIST(APPEND librepo_internal_HEADERS
     downloader_internal.h
     downloadtarget_internal.h
     fastestmirror_internal.h
+    gpg_internal.h
     handle_internal.h
     repoconf_internal.h
     result_internal.h
@@ -60,9 +67,14 @@ TARGET_LINK_LIBRARIES(librepo
                         ${LIBXML2_LIBRARIES}
                         ${CURL_LIBRARY}
                         ${LIBCRYPTO_LIBRARIES}
-                        ${GPGME_VANILLA_LIBRARIES}
                         ${GLIB2_LIBRARIES}
                      )
+IF (USE_GPGME)
+    TARGET_LINK_LIBRARIES(librepo ${GPGME_VANILLA_LIBRARIES})
+ELSE(USE_GPGME)
+    TARGET_LINK_LIBRARIES(librepo ${RPM_LIBRARIES})
+ENDIF (USE_GPGME)
+
 IF (WITH_ZCHUNK)
     TARGET_LINK_LIBRARIES(librepo ${ZCHUNKLIB_LIBRARIES})
 ENDIF (WITH_ZCHUNK)