80
89
seconds = td.seconds % 60,
93
def rfc3339_duration_to_delta(duration):
94
"""Parse an RFC 3339 "duration" and return a datetime.timedelta
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>>> rfc3339_duration_to_delta("P7D")
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>>> rfc3339_duration_to_delta("PT60S")
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datetime.timedelta(0, 60)
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>>> rfc3339_duration_to_delta("PT60M")
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datetime.timedelta(0, 3600)
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>>> rfc3339_duration_to_delta("PT24H")
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datetime.timedelta(1)
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>>> rfc3339_duration_to_delta("P1W")
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datetime.timedelta(7)
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>>> rfc3339_duration_to_delta("PT5M30S")
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datetime.timedelta(0, 330)
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>>> rfc3339_duration_to_delta("P1DT3M20S")
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datetime.timedelta(1, 200)
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# Parsing an RFC 3339 duration with regular expressions is not
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# possible - there would have to be multiple places for the same
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# values, like seconds. The current code, while more esoteric, is
115
# cleaner without depending on a parsing library. If Python had a
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# built-in library for parsing we would use it, but we'd like to
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# avoid excessive use of external libraries.
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# New type for defining tokens, syntax, and semantics all-in-one
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Token = collections.namedtuple("Token",
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("regexp", # To match token; if
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# "value" is not None,
123
# must have a "group"
125
"value", # datetime.timedelta or
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"followers")) # Tokens valid after
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# RFC 3339 "duration" tokens, syntax, and semantics; taken from
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# the "duration" ABNF definition in RFC 3339, Appendix A.
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token_end = Token(re.compile(r"$"), None, frozenset())
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token_second = Token(re.compile(r"(\d+)S"),
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datetime.timedelta(seconds=1),
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frozenset((token_end,)))
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token_minute = Token(re.compile(r"(\d+)M"),
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datetime.timedelta(minutes=1),
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frozenset((token_second, token_end)))
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token_hour = Token(re.compile(r"(\d+)H"),
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datetime.timedelta(hours=1),
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frozenset((token_minute, token_end)))
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token_time = Token(re.compile(r"T"),
143
frozenset((token_hour, token_minute,
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token_day = Token(re.compile(r"(\d+)D"),
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datetime.timedelta(days=1),
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frozenset((token_time, token_end)))
148
token_month = Token(re.compile(r"(\d+)M"),
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datetime.timedelta(weeks=4),
150
frozenset((token_day, token_end)))
151
token_year = Token(re.compile(r"(\d+)Y"),
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datetime.timedelta(weeks=52),
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frozenset((token_month, token_end)))
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token_week = Token(re.compile(r"(\d+)W"),
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datetime.timedelta(weeks=1),
156
frozenset((token_end,)))
157
token_duration = Token(re.compile(r"P"), None,
158
frozenset((token_year, token_month,
159
token_day, token_time,
161
# Define starting values
162
value = datetime.timedelta() # Value so far
164
followers = frozenset((token_duration,)) # Following valid tokens
165
s = duration # String left to parse
166
# Loop until end token is found
167
while found_token is not token_end:
168
# Search for any currently valid tokens
169
for token in followers:
170
match = token.regexp.match(s)
171
if match is not None:
173
if token.value is not None:
174
# Value found, parse digits
175
factor = int(match.group(1), 10)
176
# Add to value so far
177
value += factor * token.value
178
# Strip token from string
179
s = token.regexp.sub("", s, 1)
182
# Set valid next tokens
183
followers = found_token.followers
186
# No currently valid tokens were found
187
raise ValueError("Invalid RFC 3339 duration")
83
192
def string_to_delta(interval):
84
193
"""Parse a string and return a datetime.timedelta
201
316
parser.add_argument("--approval-duration",
202
317
help="Set duration of one client approval")
203
318
parser.add_argument("-H", "--host", help="Set host for client")
204
parser.add_argument("-s", "--secret", type=file,
319
parser.add_argument("-s", "--secret",
320
type=argparse.FileType(mode="rb"),
205
321
help="Set password blob (file) for client")
206
322
parser.add_argument("-A", "--approve", action="store_true",
207
323
help="Approve any current client request")
208
324
parser.add_argument("-D", "--deny", action="store_true",
209
325
help="Deny any current client request")
326
parser.add_argument("--check", action="store_true",
327
help="Run self-test")
210
328
parser.add_argument("client", nargs="*", help="Client name")
211
329
options = parser.parse_args()