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# fetchcode is a free software tool from nexB Inc. and others.
# Visit https://github.com/aboutcode-org/fetchcode for support and download.
#
# Copyright (c) nexB Inc. and others. All rights reserved.
# http://nexb.com and http://aboutcode.org
#
# This software is licensed under the Apache License version 2.0.
#
# You may not use this software except in compliance with the License.
# You may obtain a copy of the License at:
# http://apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software distributed
# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
from packageurl import PackageURL
from fetchcode.utils import _http_exists
class CRAN:
"""
This class handles CRAN PURLs.
"""
purl_pattern = "pkg:cran/.*"
base_url = "https://cran.r-project.org"
@classmethod
def get_download_url(cls, purl: str):
"""
Resolve a CRAN PURL to a verified, downloadable source tarball URL.
Tries current contrib first, then Archive.
"""
p = PackageURL.from_string(purl)
if not p.name or not p.version:
return None
current_url = f"{cls.base_url}/src/contrib/{p.name}_{p.version}.tar.gz"
if _http_exists(current_url):
return current_url
archive_url = f"{cls.base_url}/src/contrib/Archive/{p.name}/{p.name}_{p.version}.tar.gz"
if _http_exists(archive_url):
return archive_url