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January 1, 2017 16:28
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Implementation of Webmention https://github.com/converspace/webmention/blob/master/README.md in Python 3 as a CGI script.
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| #!/usr/bin/python3 | |
| import os | |
| import cgi | |
| import cgitb | |
| cgitb.enable() | |
| import subprocess | |
| import urllib.request | |
| form = cgi.FieldStorage() | |
| source = form.getvalue('source', None) | |
| target = form.getvalue('target', None) | |
| server = os.environ.get('SERVER_NAME', None) | |
| method = os.environ.get('REQUEST_METHOD', 'GET') | |
| def validate(source, target, server, method, callback_if_valid): | |
| status = 400 | |
| if method != 'POST': | |
| message = 'Webmention MUST be performed through a POST request.' | |
| elif source is None or target is None: | |
| message = 'Please fill in the source and target fields.' | |
| elif '://' not in source or '://' not in target: | |
| message = 'Source and target fields should be URLs.' | |
| elif not target.split('://', 1)[1].startswith(server): | |
| message = 'Target should be a link to this domain: {0}'.format(server) | |
| elif not target in urllib.request.urlopen(source).read().decode('utf-8'): | |
| message = 'Source should have a link to the target: {0}'.format(target) | |
| else: | |
| message = 'Success! With source={source} and target={target}'.format( | |
| source=source, | |
| target=target, | |
| ) | |
| status = 202 | |
| callback_if_valid(source, target) | |
| return status, message | |
| def send_response(status, message): | |
| print('Content-type: text/html') | |
| print('Status: {0}'.format(status)) | |
| print() | |
| print("""<!doctype html><html lang=en> | |
| <head><meta charset=utf-8><title>Webmention</title></head> | |
| <body><p>{message}</p></body></html>""".format(message=message)) | |
| def on_valid_submission(source, target): | |
| commands = [ | |
| 'cd /home/larlet/www', | |
| 'source /home/larlet/.virtualenvs/webmention/bin/activate', | |
| 'fab --hide=everything add_webmention:{source},{target}'.format( | |
| source=source, | |
| target=target, | |
| ), | |
| ] | |
| subprocess.call(' && '.join(commands), shell=True) | |
| send_response(*validate(source, target, server, method, on_valid_submission)) |
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/poke @fcotton :)