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76 lines
3.0 KiB
Python
76 lines
3.0 KiB
Python
import datetime
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import hashlib
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import hmac
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from .common import InfoExtractor
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from ..compat import compat_urllib_parse_urlencode
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class AWSIE(InfoExtractor): # XXX: Conventionally, base classes should end with BaseIE/InfoExtractor
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_AWS_ALGORITHM = 'AWS4-HMAC-SHA256'
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_AWS_REGION = 'us-east-1'
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def _aws_execute_api(self, aws_dict, video_id, query=None):
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query = query or {}
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amz_date = datetime.datetime.utcnow().strftime('%Y%m%dT%H%M%SZ')
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date = amz_date[:8]
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headers = {
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'Accept': 'application/json',
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'Host': self._AWS_PROXY_HOST,
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'X-Amz-Date': amz_date,
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'X-Api-Key': self._AWS_API_KEY
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}
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session_token = aws_dict.get('session_token')
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if session_token:
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headers['X-Amz-Security-Token'] = session_token
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def aws_hash(s):
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return hashlib.sha256(s.encode('utf-8')).hexdigest()
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# Task 1: http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
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canonical_querystring = compat_urllib_parse_urlencode(query)
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canonical_headers = ''
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for header_name, header_value in sorted(headers.items()):
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canonical_headers += '%s:%s\n' % (header_name.lower(), header_value)
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signed_headers = ';'.join([header.lower() for header in sorted(headers.keys())])
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canonical_request = '\n'.join([
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'GET',
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aws_dict['uri'],
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canonical_querystring,
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canonical_headers,
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signed_headers,
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aws_hash('')
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])
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# Task 2: http://docs.aws.amazon.com/general/latest/gr/sigv4-create-string-to-sign.html
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credential_scope_list = [date, self._AWS_REGION, 'execute-api', 'aws4_request']
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credential_scope = '/'.join(credential_scope_list)
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string_to_sign = '\n'.join([self._AWS_ALGORITHM, amz_date, credential_scope, aws_hash(canonical_request)])
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# Task 3: http://docs.aws.amazon.com/general/latest/gr/sigv4-calculate-signature.html
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def aws_hmac(key, msg):
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return hmac.new(key, msg.encode('utf-8'), hashlib.sha256)
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def aws_hmac_digest(key, msg):
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return aws_hmac(key, msg).digest()
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def aws_hmac_hexdigest(key, msg):
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return aws_hmac(key, msg).hexdigest()
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k_signing = ('AWS4' + aws_dict['secret_key']).encode('utf-8')
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for value in credential_scope_list:
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k_signing = aws_hmac_digest(k_signing, value)
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signature = aws_hmac_hexdigest(k_signing, string_to_sign)
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# Task 4: http://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html
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headers['Authorization'] = ', '.join([
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'%s Credential=%s/%s' % (self._AWS_ALGORITHM, aws_dict['access_key'], credential_scope),
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'SignedHeaders=%s' % signed_headers,
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'Signature=%s' % signature,
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])
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return self._download_json(
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'https://%s%s%s' % (self._AWS_PROXY_HOST, aws_dict['uri'], '?' + canonical_querystring if canonical_querystring else ''),
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video_id, headers=headers)
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