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1 | # This file is from Python 2.5. It has been modified by adding this |
2 | # license header, which is copied from the LICENSE file distributed | |
3 | # with Python. | |
4 | # | |
5 | # PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2 | |
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52 | # Agreement. | |
53 | ||
99155935 BP |
54 | r"""UUID objects (universally unique identifiers) according to RFC 4122. |
55 | ||
56 | This module provides immutable UUID objects (class UUID) and the functions | |
57 | uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5 | |
58 | UUIDs as specified in RFC 4122. | |
59 | ||
60 | If all you want is a unique ID, you should probably call uuid1() or uuid4(). | |
61 | Note that uuid1() may compromise privacy since it creates a UUID containing | |
62 | the computer's network address. uuid4() creates a random UUID. | |
63 | ||
64 | Typical usage: | |
65 | ||
66 | >>> import uuid | |
67 | ||
68 | # make a UUID based on the host ID and current time | |
69 | >>> uuid.uuid1() | |
70 | UUID('a8098c1a-f86e-11da-bd1a-00112444be1e') | |
71 | ||
72 | # make a UUID using an MD5 hash of a namespace UUID and a name | |
73 | >>> uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org') | |
74 | UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e') | |
75 | ||
76 | # make a random UUID | |
77 | >>> uuid.uuid4() | |
78 | UUID('16fd2706-8baf-433b-82eb-8c7fada847da') | |
79 | ||
80 | # make a UUID using a SHA-1 hash of a namespace UUID and a name | |
81 | >>> uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org') | |
82 | UUID('886313e1-3b8a-5372-9b90-0c9aee199e5d') | |
83 | ||
84 | # make a UUID from a string of hex digits (braces and hyphens ignored) | |
85 | >>> x = uuid.UUID('{00010203-0405-0607-0809-0a0b0c0d0e0f}') | |
86 | ||
87 | # convert a UUID to a string of hex digits in standard form | |
88 | >>> str(x) | |
89 | '00010203-0405-0607-0809-0a0b0c0d0e0f' | |
90 | ||
91 | # get the raw 16 bytes of the UUID | |
92 | >>> x.bytes | |
93 | '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f' | |
94 | ||
95 | # make a UUID from a 16-byte string | |
96 | >>> uuid.UUID(bytes=x.bytes) | |
97 | UUID('00010203-0405-0607-0809-0a0b0c0d0e0f') | |
98 | """ | |
99 | ||
100 | __author__ = 'Ka-Ping Yee <ping@zesty.ca>' | |
101 | ||
102 | RESERVED_NCS, RFC_4122, RESERVED_MICROSOFT, RESERVED_FUTURE = [ | |
103 | 'reserved for NCS compatibility', 'specified in RFC 4122', | |
104 | 'reserved for Microsoft compatibility', 'reserved for future definition'] | |
105 | ||
106 | class UUID(object): | |
107 | """Instances of the UUID class represent UUIDs as specified in RFC 4122. | |
108 | UUID objects are immutable, hashable, and usable as dictionary keys. | |
109 | Converting a UUID to a string with str() yields something in the form | |
110 | '12345678-1234-1234-1234-123456789abc'. The UUID constructor accepts | |
111 | five possible forms: a similar string of hexadecimal digits, or a tuple | |
112 | of six integer fields (with 32-bit, 16-bit, 16-bit, 8-bit, 8-bit, and | |
113 | 48-bit values respectively) as an argument named 'fields', or a string | |
114 | of 16 bytes (with all the integer fields in big-endian order) as an | |
115 | argument named 'bytes', or a string of 16 bytes (with the first three | |
116 | fields in little-endian order) as an argument named 'bytes_le', or a | |
117 | single 128-bit integer as an argument named 'int'. | |
118 | ||
119 | UUIDs have these read-only attributes: | |
120 | ||
121 | bytes the UUID as a 16-byte string (containing the six | |
122 | integer fields in big-endian byte order) | |
123 | ||
124 | bytes_le the UUID as a 16-byte string (with time_low, time_mid, | |
125 | and time_hi_version in little-endian byte order) | |
126 | ||
127 | fields a tuple of the six integer fields of the UUID, | |
128 | which are also available as six individual attributes | |
129 | and two derived attributes: | |
130 | ||
131 | time_low the first 32 bits of the UUID | |
132 | time_mid the next 16 bits of the UUID | |
133 | time_hi_version the next 16 bits of the UUID | |
134 | clock_seq_hi_variant the next 8 bits of the UUID | |
135 | clock_seq_low the next 8 bits of the UUID | |
136 | node the last 48 bits of the UUID | |
137 | ||
138 | time the 60-bit timestamp | |
139 | clock_seq the 14-bit sequence number | |
140 | ||
141 | hex the UUID as a 32-character hexadecimal string | |
142 | ||
143 | int the UUID as a 128-bit integer | |
144 | ||
145 | urn the UUID as a URN as specified in RFC 4122 | |
146 | ||
147 | variant the UUID variant (one of the constants RESERVED_NCS, | |
148 | RFC_4122, RESERVED_MICROSOFT, or RESERVED_FUTURE) | |
149 | ||
150 | version the UUID version number (1 through 5, meaningful only | |
151 | when the variant is RFC_4122) | |
152 | """ | |
153 | ||
154 | def __init__(self, hex=None, bytes=None, bytes_le=None, fields=None, | |
155 | int=None, version=None): | |
156 | r"""Create a UUID from either a string of 32 hexadecimal digits, | |
157 | a string of 16 bytes as the 'bytes' argument, a string of 16 bytes | |
158 | in little-endian order as the 'bytes_le' argument, a tuple of six | |
159 | integers (32-bit time_low, 16-bit time_mid, 16-bit time_hi_version, | |
160 | 8-bit clock_seq_hi_variant, 8-bit clock_seq_low, 48-bit node) as | |
161 | the 'fields' argument, or a single 128-bit integer as the 'int' | |
162 | argument. When a string of hex digits is given, curly braces, | |
163 | hyphens, and a URN prefix are all optional. For example, these | |
164 | expressions all yield the same UUID: | |
165 | ||
166 | UUID('{12345678-1234-5678-1234-567812345678}') | |
167 | UUID('12345678123456781234567812345678') | |
168 | UUID('urn:uuid:12345678-1234-5678-1234-567812345678') | |
169 | UUID(bytes='\x12\x34\x56\x78'*4) | |
170 | UUID(bytes_le='\x78\x56\x34\x12\x34\x12\x78\x56' + | |
171 | '\x12\x34\x56\x78\x12\x34\x56\x78') | |
172 | UUID(fields=(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x567812345678)) | |
173 | UUID(int=0x12345678123456781234567812345678) | |
174 | ||
175 | Exactly one of 'hex', 'bytes', 'bytes_le', 'fields', or 'int' must | |
176 | be given. The 'version' argument is optional; if given, the resulting | |
177 | UUID will have its variant and version set according to RFC 4122, | |
178 | overriding the given 'hex', 'bytes', 'bytes_le', 'fields', or 'int'. | |
179 | """ | |
180 | ||
181 | if [hex, bytes, bytes_le, fields, int].count(None) != 4: | |
182 | raise TypeError('need one of hex, bytes, bytes_le, fields, or int') | |
183 | if hex is not None: | |
184 | hex = hex.replace('urn:', '').replace('uuid:', '') | |
185 | hex = hex.strip('{}').replace('-', '') | |
186 | if len(hex) != 32: | |
187 | raise ValueError('badly formed hexadecimal UUID string') | |
188 | int = long(hex, 16) | |
189 | if bytes_le is not None: | |
190 | if len(bytes_le) != 16: | |
191 | raise ValueError('bytes_le is not a 16-char string') | |
192 | bytes = (bytes_le[3] + bytes_le[2] + bytes_le[1] + bytes_le[0] + | |
193 | bytes_le[5] + bytes_le[4] + bytes_le[7] + bytes_le[6] + | |
194 | bytes_le[8:]) | |
195 | if bytes is not None: | |
196 | if len(bytes) != 16: | |
197 | raise ValueError('bytes is not a 16-char string') | |
198 | int = long(('%02x'*16) % tuple(map(ord, bytes)), 16) | |
199 | if fields is not None: | |
200 | if len(fields) != 6: | |
201 | raise ValueError('fields is not a 6-tuple') | |
202 | (time_low, time_mid, time_hi_version, | |
203 | clock_seq_hi_variant, clock_seq_low, node) = fields | |
204 | if not 0 <= time_low < 1<<32L: | |
205 | raise ValueError('field 1 out of range (need a 32-bit value)') | |
206 | if not 0 <= time_mid < 1<<16L: | |
207 | raise ValueError('field 2 out of range (need a 16-bit value)') | |
208 | if not 0 <= time_hi_version < 1<<16L: | |
209 | raise ValueError('field 3 out of range (need a 16-bit value)') | |
210 | if not 0 <= clock_seq_hi_variant < 1<<8L: | |
211 | raise ValueError('field 4 out of range (need an 8-bit value)') | |
212 | if not 0 <= clock_seq_low < 1<<8L: | |
213 | raise ValueError('field 5 out of range (need an 8-bit value)') | |
214 | if not 0 <= node < 1<<48L: | |
215 | raise ValueError('field 6 out of range (need a 48-bit value)') | |
216 | clock_seq = (clock_seq_hi_variant << 8L) | clock_seq_low | |
217 | int = ((time_low << 96L) | (time_mid << 80L) | | |
218 | (time_hi_version << 64L) | (clock_seq << 48L) | node) | |
219 | if int is not None: | |
220 | if not 0 <= int < 1<<128L: | |
221 | raise ValueError('int is out of range (need a 128-bit value)') | |
222 | if version is not None: | |
223 | if not 1 <= version <= 5: | |
224 | raise ValueError('illegal version number') | |
225 | # Set the variant to RFC 4122. | |
226 | int &= ~(0xc000 << 48L) | |
227 | int |= 0x8000 << 48L | |
228 | # Set the version number. | |
229 | int &= ~(0xf000 << 64L) | |
230 | int |= version << 76L | |
231 | self.__dict__['int'] = int | |
232 | ||
233 | def __cmp__(self, other): | |
234 | if isinstance(other, UUID): | |
235 | return cmp(self.int, other.int) | |
236 | return NotImplemented | |
237 | ||
238 | def __hash__(self): | |
239 | return hash(self.int) | |
240 | ||
241 | def __int__(self): | |
242 | return self.int | |
243 | ||
244 | def __repr__(self): | |
245 | return 'UUID(%r)' % str(self) | |
246 | ||
247 | def __setattr__(self, name, value): | |
248 | raise TypeError('UUID objects are immutable') | |
249 | ||
250 | def __str__(self): | |
251 | hex = '%032x' % self.int | |
252 | return '%s-%s-%s-%s-%s' % ( | |
253 | hex[:8], hex[8:12], hex[12:16], hex[16:20], hex[20:]) | |
254 | ||
255 | def get_bytes(self): | |
256 | bytes = '' | |
257 | for shift in range(0, 128, 8): | |
258 | bytes = chr((self.int >> shift) & 0xff) + bytes | |
259 | return bytes | |
260 | ||
261 | bytes = property(get_bytes) | |
262 | ||
263 | def get_bytes_le(self): | |
264 | bytes = self.bytes | |
265 | return (bytes[3] + bytes[2] + bytes[1] + bytes[0] + | |
266 | bytes[5] + bytes[4] + bytes[7] + bytes[6] + bytes[8:]) | |
267 | ||
268 | bytes_le = property(get_bytes_le) | |
269 | ||
270 | def get_fields(self): | |
271 | return (self.time_low, self.time_mid, self.time_hi_version, | |
272 | self.clock_seq_hi_variant, self.clock_seq_low, self.node) | |
273 | ||
274 | fields = property(get_fields) | |
275 | ||
276 | def get_time_low(self): | |
277 | return self.int >> 96L | |
278 | ||
279 | time_low = property(get_time_low) | |
280 | ||
281 | def get_time_mid(self): | |
282 | return (self.int >> 80L) & 0xffff | |
283 | ||
284 | time_mid = property(get_time_mid) | |
285 | ||
286 | def get_time_hi_version(self): | |
287 | return (self.int >> 64L) & 0xffff | |
288 | ||
289 | time_hi_version = property(get_time_hi_version) | |
290 | ||
291 | def get_clock_seq_hi_variant(self): | |
292 | return (self.int >> 56L) & 0xff | |
293 | ||
294 | clock_seq_hi_variant = property(get_clock_seq_hi_variant) | |
295 | ||
296 | def get_clock_seq_low(self): | |
297 | return (self.int >> 48L) & 0xff | |
298 | ||
299 | clock_seq_low = property(get_clock_seq_low) | |
300 | ||
301 | def get_time(self): | |
302 | return (((self.time_hi_version & 0x0fffL) << 48L) | | |
303 | (self.time_mid << 32L) | self.time_low) | |
304 | ||
305 | time = property(get_time) | |
306 | ||
307 | def get_clock_seq(self): | |
308 | return (((self.clock_seq_hi_variant & 0x3fL) << 8L) | | |
309 | self.clock_seq_low) | |
310 | ||
311 | clock_seq = property(get_clock_seq) | |
312 | ||
313 | def get_node(self): | |
314 | return self.int & 0xffffffffffff | |
315 | ||
316 | node = property(get_node) | |
317 | ||
318 | def get_hex(self): | |
319 | return '%032x' % self.int | |
320 | ||
321 | hex = property(get_hex) | |
322 | ||
323 | def get_urn(self): | |
324 | return 'urn:uuid:' + str(self) | |
325 | ||
326 | urn = property(get_urn) | |
327 | ||
328 | def get_variant(self): | |
329 | if not self.int & (0x8000 << 48L): | |
330 | return RESERVED_NCS | |
331 | elif not self.int & (0x4000 << 48L): | |
332 | return RFC_4122 | |
333 | elif not self.int & (0x2000 << 48L): | |
334 | return RESERVED_MICROSOFT | |
335 | else: | |
336 | return RESERVED_FUTURE | |
337 | ||
338 | variant = property(get_variant) | |
339 | ||
340 | def get_version(self): | |
341 | # The version bits are only meaningful for RFC 4122 UUIDs. | |
342 | if self.variant == RFC_4122: | |
343 | return int((self.int >> 76L) & 0xf) | |
344 | ||
345 | version = property(get_version) | |
346 | ||
347 | def _find_mac(command, args, hw_identifiers, get_index): | |
348 | import os | |
349 | for dir in ['', '/sbin/', '/usr/sbin']: | |
350 | executable = os.path.join(dir, command) | |
351 | if not os.path.exists(executable): | |
352 | continue | |
353 | ||
354 | try: | |
355 | # LC_ALL to get English output, 2>/dev/null to | |
356 | # prevent output on stderr | |
357 | cmd = 'LC_ALL=C %s %s 2>/dev/null' % (executable, args) | |
358 | pipe = os.popen(cmd) | |
359 | except IOError: | |
360 | continue | |
361 | ||
362 | for line in pipe: | |
363 | words = line.lower().split() | |
364 | for i in range(len(words)): | |
365 | if words[i] in hw_identifiers: | |
366 | return int(words[get_index(i)].replace(':', ''), 16) | |
367 | return None | |
368 | ||
369 | def _ifconfig_getnode(): | |
370 | """Get the hardware address on Unix by running ifconfig.""" | |
371 | ||
372 | # This works on Linux ('' or '-a'), Tru64 ('-av'), but not all Unixes. | |
373 | for args in ('', '-a', '-av'): | |
374 | mac = _find_mac('ifconfig', args, ['hwaddr', 'ether'], lambda i: i+1) | |
375 | if mac: | |
376 | return mac | |
377 | ||
378 | import socket | |
379 | ip_addr = socket.gethostbyname(socket.gethostname()) | |
380 | ||
381 | # Try getting the MAC addr from arp based on our IP address (Solaris). | |
382 | mac = _find_mac('arp', '-an', [ip_addr], lambda i: -1) | |
383 | if mac: | |
384 | return mac | |
385 | ||
386 | # This might work on HP-UX. | |
387 | mac = _find_mac('lanscan', '-ai', ['lan0'], lambda i: 0) | |
388 | if mac: | |
389 | return mac | |
390 | ||
391 | return None | |
392 | ||
393 | def _ipconfig_getnode(): | |
394 | """Get the hardware address on Windows by running ipconfig.exe.""" | |
395 | import os, re | |
396 | dirs = ['', r'c:\windows\system32', r'c:\winnt\system32'] | |
397 | try: | |
398 | import ctypes | |
399 | buffer = ctypes.create_string_buffer(300) | |
400 | ctypes.windll.kernel32.GetSystemDirectoryA(buffer, 300) | |
401 | dirs.insert(0, buffer.value.decode('mbcs')) | |
402 | except: | |
403 | pass | |
404 | for dir in dirs: | |
405 | try: | |
406 | pipe = os.popen(os.path.join(dir, 'ipconfig') + ' /all') | |
407 | except IOError: | |
408 | continue | |
409 | for line in pipe: | |
410 | value = line.split(':')[-1].strip().lower() | |
411 | if re.match('([0-9a-f][0-9a-f]-){5}[0-9a-f][0-9a-f]', value): | |
412 | return int(value.replace('-', ''), 16) | |
413 | ||
414 | def _netbios_getnode(): | |
415 | """Get the hardware address on Windows using NetBIOS calls. | |
416 | See http://support.microsoft.com/kb/118623 for details.""" | |
417 | import win32wnet, netbios | |
418 | ncb = netbios.NCB() | |
419 | ncb.Command = netbios.NCBENUM | |
420 | ncb.Buffer = adapters = netbios.LANA_ENUM() | |
421 | adapters._pack() | |
422 | if win32wnet.Netbios(ncb) != 0: | |
423 | return | |
424 | adapters._unpack() | |
425 | for i in range(adapters.length): | |
426 | ncb.Reset() | |
427 | ncb.Command = netbios.NCBRESET | |
428 | ncb.Lana_num = ord(adapters.lana[i]) | |
429 | if win32wnet.Netbios(ncb) != 0: | |
430 | continue | |
431 | ncb.Reset() | |
432 | ncb.Command = netbios.NCBASTAT | |
433 | ncb.Lana_num = ord(adapters.lana[i]) | |
434 | ncb.Callname = '*'.ljust(16) | |
435 | ncb.Buffer = status = netbios.ADAPTER_STATUS() | |
436 | if win32wnet.Netbios(ncb) != 0: | |
437 | continue | |
438 | status._unpack() | |
439 | bytes = map(ord, status.adapter_address) | |
440 | return ((bytes[0]<<40L) + (bytes[1]<<32L) + (bytes[2]<<24L) + | |
441 | (bytes[3]<<16L) + (bytes[4]<<8L) + bytes[5]) | |
442 | ||
443 | # Thanks to Thomas Heller for ctypes and for his help with its use here. | |
444 | ||
445 | # If ctypes is available, use it to find system routines for UUID generation. | |
446 | _uuid_generate_random = _uuid_generate_time = _UuidCreate = None | |
447 | try: | |
448 | import ctypes, ctypes.util | |
449 | _buffer = ctypes.create_string_buffer(16) | |
450 | ||
451 | # The uuid_generate_* routines are provided by libuuid on at least | |
452 | # Linux and FreeBSD, and provided by libc on Mac OS X. | |
453 | for libname in ['uuid', 'c']: | |
454 | try: | |
455 | lib = ctypes.CDLL(ctypes.util.find_library(libname)) | |
456 | except: | |
457 | continue | |
458 | if hasattr(lib, 'uuid_generate_random'): | |
459 | _uuid_generate_random = lib.uuid_generate_random | |
460 | if hasattr(lib, 'uuid_generate_time'): | |
461 | _uuid_generate_time = lib.uuid_generate_time | |
462 | ||
463 | # On Windows prior to 2000, UuidCreate gives a UUID containing the | |
464 | # hardware address. On Windows 2000 and later, UuidCreate makes a | |
465 | # random UUID and UuidCreateSequential gives a UUID containing the | |
466 | # hardware address. These routines are provided by the RPC runtime. | |
467 | # NOTE: at least on Tim's WinXP Pro SP2 desktop box, while the last | |
468 | # 6 bytes returned by UuidCreateSequential are fixed, they don't appear | |
469 | # to bear any relationship to the MAC address of any network device | |
470 | # on the box. | |
471 | try: | |
472 | lib = ctypes.windll.rpcrt4 | |
473 | except: | |
474 | lib = None | |
475 | _UuidCreate = getattr(lib, 'UuidCreateSequential', | |
476 | getattr(lib, 'UuidCreate', None)) | |
477 | except: | |
478 | pass | |
479 | ||
480 | def _unixdll_getnode(): | |
481 | """Get the hardware address on Unix using ctypes.""" | |
482 | _uuid_generate_time(_buffer) | |
483 | return UUID(bytes=_buffer.raw).node | |
484 | ||
485 | def _windll_getnode(): | |
486 | """Get the hardware address on Windows using ctypes.""" | |
487 | if _UuidCreate(_buffer) == 0: | |
488 | return UUID(bytes=_buffer.raw).node | |
489 | ||
490 | def _random_getnode(): | |
491 | """Get a random node ID, with eighth bit set as suggested by RFC 4122.""" | |
492 | import random | |
493 | return random.randrange(0, 1<<48L) | 0x010000000000L | |
494 | ||
495 | _node = None | |
496 | ||
497 | def getnode(): | |
498 | """Get the hardware address as a 48-bit positive integer. | |
499 | ||
500 | The first time this runs, it may launch a separate program, which could | |
501 | be quite slow. If all attempts to obtain the hardware address fail, we | |
502 | choose a random 48-bit number with its eighth bit set to 1 as recommended | |
503 | in RFC 4122. | |
504 | """ | |
505 | ||
506 | global _node | |
507 | if _node is not None: | |
508 | return _node | |
509 | ||
510 | import sys | |
511 | if sys.platform == 'win32': | |
512 | getters = [_windll_getnode, _netbios_getnode, _ipconfig_getnode] | |
513 | else: | |
514 | getters = [_unixdll_getnode, _ifconfig_getnode] | |
515 | ||
516 | for getter in getters + [_random_getnode]: | |
517 | try: | |
518 | _node = getter() | |
519 | except: | |
520 | continue | |
521 | if _node is not None: | |
522 | return _node | |
523 | ||
524 | _last_timestamp = None | |
525 | ||
526 | def uuid1(node=None, clock_seq=None): | |
527 | """Generate a UUID from a host ID, sequence number, and the current time. | |
528 | If 'node' is not given, getnode() is used to obtain the hardware | |
529 | address. If 'clock_seq' is given, it is used as the sequence number; | |
530 | otherwise a random 14-bit sequence number is chosen.""" | |
531 | ||
532 | # When the system provides a version-1 UUID generator, use it (but don't | |
533 | # use UuidCreate here because its UUIDs don't conform to RFC 4122). | |
534 | if _uuid_generate_time and node is clock_seq is None: | |
535 | _uuid_generate_time(_buffer) | |
536 | return UUID(bytes=_buffer.raw) | |
537 | ||
538 | global _last_timestamp | |
539 | import time | |
540 | nanoseconds = int(time.time() * 1e9) | |
541 | # 0x01b21dd213814000 is the number of 100-ns intervals between the | |
542 | # UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00. | |
543 | timestamp = int(nanoseconds/100) + 0x01b21dd213814000L | |
544 | if timestamp <= _last_timestamp: | |
545 | timestamp = _last_timestamp + 1 | |
546 | _last_timestamp = timestamp | |
547 | if clock_seq is None: | |
548 | import random | |
549 | clock_seq = random.randrange(1<<14L) # instead of stable storage | |
550 | time_low = timestamp & 0xffffffffL | |
551 | time_mid = (timestamp >> 32L) & 0xffffL | |
552 | time_hi_version = (timestamp >> 48L) & 0x0fffL | |
553 | clock_seq_low = clock_seq & 0xffL | |
554 | clock_seq_hi_variant = (clock_seq >> 8L) & 0x3fL | |
555 | if node is None: | |
556 | node = getnode() | |
557 | return UUID(fields=(time_low, time_mid, time_hi_version, | |
558 | clock_seq_hi_variant, clock_seq_low, node), version=1) | |
559 | ||
560 | def uuid3(namespace, name): | |
561 | """Generate a UUID from the MD5 hash of a namespace UUID and a name.""" | |
562 | import md5 | |
563 | hash = md5.md5(namespace.bytes + name).digest() | |
564 | return UUID(bytes=hash[:16], version=3) | |
565 | ||
566 | def uuid4(): | |
567 | """Generate a random UUID.""" | |
568 | ||
569 | # When the system provides a version-4 UUID generator, use it. | |
570 | if _uuid_generate_random: | |
571 | _uuid_generate_random(_buffer) | |
572 | return UUID(bytes=_buffer.raw) | |
573 | ||
574 | # Otherwise, get randomness from urandom or the 'random' module. | |
575 | try: | |
576 | import os | |
577 | return UUID(bytes=os.urandom(16), version=4) | |
578 | except: | |
579 | import random | |
580 | bytes = [chr(random.randrange(256)) for i in range(16)] | |
581 | return UUID(bytes=bytes, version=4) | |
582 | ||
583 | def uuid5(namespace, name): | |
584 | """Generate a UUID from the SHA-1 hash of a namespace UUID and a name.""" | |
585 | import sha | |
586 | hash = sha.sha(namespace.bytes + name).digest() | |
587 | return UUID(bytes=hash[:16], version=5) | |
588 | ||
589 | # The following standard UUIDs are for use with uuid3() or uuid5(). | |
590 | ||
591 | NAMESPACE_DNS = UUID('6ba7b810-9dad-11d1-80b4-00c04fd430c8') | |
592 | NAMESPACE_URL = UUID('6ba7b811-9dad-11d1-80b4-00c04fd430c8') | |
593 | NAMESPACE_OID = UUID('6ba7b812-9dad-11d1-80b4-00c04fd430c8') | |
594 | NAMESPACE_X500 = UUID('6ba7b814-9dad-11d1-80b4-00c04fd430c8') |