ForgeImporters/forgeimporters/trac/__init__.py

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#       to you under the Apache License, Version 2.0 (the
#       "License"); you may not use this file except in compliance
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#
#         http://www.apache.org/licenses/LICENSE-2.0
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from formencode import validators as fev
import requests


class TracURLValidator(fev.URL):
    not_empty = True
    messages = {
        'unavailable': 'This project is unavailable for import'
    }

    def _to_python(self, value, state=None):
        value = super(TracURLValidator, self)._to_python(value, state)
        # remove extraneous /wiki/[PageName] from the end of the URL
        url_parts = value.split('/')
        try:
            wiki_in_url = url_parts.index('wiki')
        except ValueError:
            wiki_in_url = -1
        if wiki_in_url >= len(url_parts) - 2:
            value = '/'.join(url_parts[:wiki_in_url])
        # normalize trailing slash
        value = value.rstrip('/') + '/'

        resp = requests.head(value, allow_redirects=True)
        if resp.status_code != 200:
            raise fev.Invalid(self.message('unavailable', state), value, state)
        return value