use env variables for both windows and unix

Author: mxamin

build_support/static_build.py

@@ -33,6 +33,34 @@ def triplet(self):
 
 
 class StaticBuildHelper:
+    WINDOWS_LIBS_DOWNLOAD_RELEASE_URL = (
+        'https://github.com/mxamin/python-xmlsec-win-binaries/releases/download/2025.07.10/'
+    )
+    LIB_VERSION_ENV_VARS = {
+        'openssl_version': 'PYXMLSEC_OPENSSL_VERSION',
+        'libiconv_version': 'PYXMLSEC_LIBICONV_VERSION',
+        'libxml2_version': 'PYXMLSEC_LIBXML2_VERSION',
+        'libxslt_version': 'PYXMLSEC_LIBXSLT_VERSION',
+        'zlib_version': 'PYXMLSEC_ZLIB_VERSION',
+        'xmlsec1_version': 'PYXMLSEC_XMLSEC1_VERSION',
+    }
+    UNIX_DEFAULT_LIB_VERSIONS = {
+        'openssl_version': '3.6.0',
+        'libiconv_version': '1.18',
+        'libxml2_version': '2.14.6',
+        'libxslt_version': '1.1.43',
+        'zlib_version': '1.3.1',
+        'xmlsec1_version': '1.3.9',
+    }
+    WINDOWS_DEFAULT_LIB_VERSIONS = {
+        'openssl_version': '3.0.16.pl1',
+        'libiconv_version': '1.18-1',
+        'libxml2_version': '2.11.9-3',
+        'libxslt_version': '1.1.39',
+        'zlib_version': '1.3.1',
+        'xmlsec1_version': '1.3.7',
+    }
+
     def __init__(self, builder):
         self.builder = builder
         self.ext = builder.ext_map['xmlsec']
@@ -69,7 +97,8 @@ def _prepare_directories(self):
         self.builder.libs_dir = self.libs_dir
 
     def _prepare_windows_build(self):
-        release_url = 'https://github.com/mxamin/python-xmlsec-win-binaries/releases/download/2025.07.10/'
+        self._set_library_versions(build_platform='windows')
+
         if platform.machine() == 'ARM64':
             suffix = 'win-arm64'
         elif sys.maxsize > 2**32:
@@ -78,16 +107,16 @@ def _prepare_windows_build(self):
             suffix = 'win32'
 
         libs = [
-            f'libxml2-2.11.9-3.{suffix}.zip',
-            f'libxslt-1.1.39.{suffix}.zip',
-            f'zlib-1.3.1.{suffix}.zip',
-            f'iconv-1.18-1.{suffix}.zip',
-            f'openssl-3.0.16.pl1.{suffix}.zip',
-            f'xmlsec-1.3.7.{suffix}.zip',
+            f'libxml2-{self.builder.libxml2_version}.{suffix}.zip',
+            f'libxslt-{self.builder.libxslt_version}.{suffix}.zip',
+            f'zlib-{self.builder.zlib_version}.{suffix}.zip',
+            f'iconv-{self.builder.libiconv_version}.{suffix}.zip',
+            f'openssl-{self.builder.openssl_version}.{suffix}.zip',
+            f'xmlsec-{self.builder.xmlsec1_version}.{suffix}.zip',
         ]
 
         for libfile in libs:
-            url = urljoin(release_url, libfile)
+            url = urljoin(self.WINDOWS_LIBS_DOWNLOAD_RELEASE_URL, libfile)
             destfile = self.libs_dir / libfile
             if destfile.is_file():
                 self.info(f'Using local copy of "{url}"')
@@ -138,21 +167,21 @@ def _prepare_windows_build(self):
         self.ext.include_dirs = [str(path.absolute()) for path in includes]
 
     def _prepare_unix_build(self, build_platform):
-        self._capture_version_overrides()
+        self._set_library_versions(build_platform=build_platform)
         archives = self._ensure_source_archives()
         self._extract_archives(archives)
 
         env, prefix_arg, ldflags, cross_compile = self._prepare_build_environment(build_platform)
         self._build_dependencies(env, prefix_arg, ldflags, cross_compile)
         self._configure_extension_for_static(build_platform)
 
-    def _capture_version_overrides(self):
-        self.builder.openssl_version = os.environ.get('PYXMLSEC_OPENSSL_VERSION', '3.6.0')
-        self.builder.libiconv_version = os.environ.get('PYXMLSEC_LIBICONV_VERSION', '1.18')
-        self.builder.libxml2_version = os.environ.get('PYXMLSEC_LIBXML2_VERSION', '2.14.6')
-        self.builder.libxslt_version = os.environ.get('PYXMLSEC_LIBXSLT_VERSION', '1.1.43')
-        self.builder.zlib_version = os.environ.get('PYXMLSEC_ZLIB_VERSION', '1.3.1')
-        self.builder.xmlsec1_version = os.environ.get('PYXMLSEC_XMLSEC1_VERSION', '1.3.9')
+    def _set_library_versions(self, build_platform):
+        defaults = self.UNIX_DEFAULT_LIB_VERSIONS
+        if build_platform == 'windows':
+            defaults = self.WINDOWS_DEFAULT_LIB_VERSIONS
+
+        for version_attr, env_var in self.LIB_VERSION_ENV_VARS.items():
+            setattr(self.builder, version_attr, os.environ.get(env_var, defaults[version_attr]))
 
     def _ensure_source_archives(self):
         return [