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# Extracted from https://github.com/pfmoore/pkg_metadata
from email.header import Header, decode_header, make_header
from email.message import Message
from typing import Any, Dict, List, Union, cast
METADATA_FIELDS = [
# Name, Multiple-Use
("Metadata-Version", False),
("Name", False),
("Version", False),
("Dynamic", True),
("Platform", True),
("Supported-Platform", True),
("Summary", False),
("Description", False),
("Description-Content-Type", False),
("Keywords", False),
("Home-page", False),
("Download-URL", False),
("Author", False),
("Author-email", False),
("Maintainer", False),
("Maintainer-email", False),
("License", False),
("License-Expression", False),
("License-File", True),
("Classifier", True),
("Requires-Dist", True),
("Requires-Python", False),
("Requires-External", True),
("Project-URL", True),
("Provides-Extra", True),
("Provides-Dist", True),
("Obsoletes-Dist", True),
]
def json_name(field: str) -> str:
return field.lower().replace("-", "_")
def msg_to_json(msg: Message) -> Dict[str, Any]:
"""Convert a Message object into a JSON-compatible dictionary."""
def sanitise_header(h: Union[Header, str]) -> str:
if isinstance(h, Header):
chunks = []
for bytes, encoding in decode_header(h):
if encoding == "unknown-8bit":
try:
# See if UTF-8 works
bytes.decode("utf-8")
encoding = "utf-8"
except UnicodeDecodeError:
# If not, latin1 at least won't fail
encoding = "latin1"
chunks.append((bytes, encoding))
return str(make_header(chunks))
return str(h)
result = {}
for field, multi in METADATA_FIELDS:
if field not in msg:
continue
key = json_name(field)
if multi:
value: Union[str, List[str]] = [
sanitise_header(v) for v in msg.get_all(field) # type: ignore
]
else:
value = sanitise_header(msg.get(field)) # type: ignore
if key == "keywords":
# Accept both comma-separated and space-separated
# forms, for better compatibility with old data.
if "," in value:
value = [v.strip() for v in value.split(",")]
else:
value = value.split()
result[key] = value
payload = cast(str, msg.get_payload())
if payload:
result["description"] = payload
return result