translate har to mermaid

har2mermaid.py

import json
import urllib.parse
import sys
import re

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("usage: python3 har2mermaid.py harfile")
        exit(1)
    har_file = sys.argv[1]
    if har_file.endswith("\.har"):
        print("input file extension must be har.")
        exit(1)
    md_file = re.sub(".har$", ".md", har_file)

    with open(har_file, 'r') as f:
        harraw = f.read()

    harobj = json.loads(harraw)
    lines = [
        "```mermaid",
        "sequenceDiagram",
        "participant visitor as visitor",
    ]
    for h in set([urllib.parse.urlparse(r['request']['url']).netloc for r in harobj['log']['entries']]):
        lines.append("participant {} as {}".format(h.replace(".", "_"), h))
    for r in harobj['log']['entries']:
        hosturl = urllib.parse.urlparse(r['request']['url'])
        host_str = hosturl.netloc.replace(".", "_")
        request_str = hosturl.path[:50]
        response_str = "{} - {}".format(r['response']['status'], r['response']['content']['mimeType'])
        lines.append("    visitor ->>+ {}: {}".format(host_str, request_str))
        lines.append("    {} -->>- visitor: {}".format(host_str, response_str))
    lines.append("```")

    with open(md_file, 'w') as w:
        w.write('\n'.join(lines))