50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
#!/usr/bin/env python3
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"""Rebuild data/misc/httpmethod.tsv from the IANA HTTP Method Registry.
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data-import/httpmethod.py [--source URL_OR_FILE] [--cache DIR] [--out FILE]
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A row needs a name of letters and hyphens, which drops the registry's `*`, and both of
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the answers the registry gives for it.
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"""
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import argparse
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import csv
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import io
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import re
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import sys
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from pathlib import Path
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import source
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import tsv
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SOURCE = "https://www.iana.org/assignments/http-methods/methods.csv"
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OUT = Path(__file__).resolve().parent.parent / "data" / "misc" / "httpmethod.tsv"
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CACHE = Path(__file__).resolve().parent / "cache"
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COLUMNS = ["idempotent", "method", "safe"]
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ANSWERS = ("yes", "no")
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def rows(text):
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for r in csv.DictReader(io.StringIO(text)):
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method = (r["Method Name"] or "").strip()
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safe, idempotent = (r["Safe"] or "").strip(), (r["Idempotent"] or "").strip()
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if not re.fullmatch(r"[A-Za-z][A-Za-z-]*", method) or not safe or not idempotent:
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continue
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for column, answer in (("Safe", safe), ("Idempotent", idempotent)):
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if answer not in ANSWERS:
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sys.exit(f"{method}: {column} {answer!r} is neither yes nor no")
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yield {"idempotent": idempotent, "method": method, "safe": safe}
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def main():
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p = argparse.ArgumentParser(description=__doc__.splitlines()[0])
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p.add_argument("--cache", default=str(CACHE))
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p.add_argument("--source", default=SOURCE)
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p.add_argument("--out", default=str(OUT))
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a = p.parse_args()
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table = sorted(rows(source.fetch(a.source, a.cache, "http-methods.csv").decode("utf-8")), key=lambda r: r["method"])
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tsv.write(a.out, COLUMNS, table)
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if __name__ == "__main__":
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main()
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