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import json
import ssl
import urllib.error
import urllib.parse
import urllib.request
from typing import Dict, Any
from .exceptions import RequirementError
BASE_URL = 'https://archlinux.org/packages/search/json/?name={package}'
BASE_GROUP_URL = 'https://archlinux.org/groups/x86_64/{group}/'
def find_group(name :str) -> bool:
ssl_context = ssl.create_default_context()
ssl_context.check_hostname = False
ssl_context.verify_mode = ssl.CERT_NONE
try:
response = urllib.request.urlopen(BASE_GROUP_URL.format(group=name), context=ssl_context)
except urllib.error.HTTPError as err:
if err.code == 404:
return False
else:
raise err
# Just to be sure some code didn't slip through the exception
if response.code == 200:
return True
def find_package(name :str) -> Any:
"""
Finds a specific package via the package database.
It makes a simple web-request, which might be a bit slow.
"""
ssl_context = ssl.create_default_context()
ssl_context.check_hostname = False
ssl_context.verify_mode = ssl.CERT_NONE
response = urllib.request.urlopen(BASE_URL.format(package=name), context=ssl_context)
data = response.read().decode('UTF-8')
return json.loads(data)
def find_packages(*names :str) -> Dict[str, Any]:
"""
This function returns the search results for many packages.
The function itself is rather slow, so consider not sending to
many packages to the search query.
"""
return {package: find_package(package) for package in names}
def validate_package_list(packages: list) -> bool:
"""
Validates a list of given packages.
Raises `RequirementError` if one or more packages are not found.
"""
invalid_packages = [
package
for package in packages
if not find_package(package)['results'] and not find_group(package)
]
if invalid_packages:
raise RequirementError(f"Invalid package names: {invalid_packages}")
return True
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