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4710c53d | 1 | r"""UUID objects (universally unique identifiers) according to RFC 4122.\r |
2 | \r | |
3 | This module provides immutable UUID objects (class UUID) and the functions\r | |
4 | uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5\r | |
5 | UUIDs as specified in RFC 4122.\r | |
6 | \r | |
7 | If all you want is a unique ID, you should probably call uuid1() or uuid4().\r | |
8 | Note that uuid1() may compromise privacy since it creates a UUID containing\r | |
9 | the computer's network address. uuid4() creates a random UUID.\r | |
10 | \r | |
11 | Typical usage:\r | |
12 | \r | |
13 | >>> import uuid\r | |
14 | \r | |
15 | # make a UUID based on the host ID and current time\r | |
16 | >>> uuid.uuid1()\r | |
17 | UUID('a8098c1a-f86e-11da-bd1a-00112444be1e')\r | |
18 | \r | |
19 | # make a UUID using an MD5 hash of a namespace UUID and a name\r | |
20 | >>> uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org')\r | |
21 | UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e')\r | |
22 | \r | |
23 | # make a random UUID\r | |
24 | >>> uuid.uuid4()\r | |
25 | UUID('16fd2706-8baf-433b-82eb-8c7fada847da')\r | |
26 | \r | |
27 | # make a UUID using a SHA-1 hash of a namespace UUID and a name\r | |
28 | >>> uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org')\r | |
29 | UUID('886313e1-3b8a-5372-9b90-0c9aee199e5d')\r | |
30 | \r | |
31 | # make a UUID from a string of hex digits (braces and hyphens ignored)\r | |
32 | >>> x = uuid.UUID('{00010203-0405-0607-0809-0a0b0c0d0e0f}')\r | |
33 | \r | |
34 | # convert a UUID to a string of hex digits in standard form\r | |
35 | >>> str(x)\r | |
36 | '00010203-0405-0607-0809-0a0b0c0d0e0f'\r | |
37 | \r | |
38 | # get the raw 16 bytes of the UUID\r | |
39 | >>> x.bytes\r | |
40 | '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f'\r | |
41 | \r | |
42 | # make a UUID from a 16-byte string\r | |
43 | >>> uuid.UUID(bytes=x.bytes)\r | |
44 | UUID('00010203-0405-0607-0809-0a0b0c0d0e0f')\r | |
45 | """\r | |
46 | \r | |
47 | __author__ = 'Ka-Ping Yee <ping@zesty.ca>'\r | |
48 | \r | |
49 | RESERVED_NCS, RFC_4122, RESERVED_MICROSOFT, RESERVED_FUTURE = [\r | |
50 | 'reserved for NCS compatibility', 'specified in RFC 4122',\r | |
51 | 'reserved for Microsoft compatibility', 'reserved for future definition']\r | |
52 | \r | |
53 | class UUID(object):\r | |
54 | """Instances of the UUID class represent UUIDs as specified in RFC 4122.\r | |
55 | UUID objects are immutable, hashable, and usable as dictionary keys.\r | |
56 | Converting a UUID to a string with str() yields something in the form\r | |
57 | '12345678-1234-1234-1234-123456789abc'. The UUID constructor accepts\r | |
58 | five possible forms: a similar string of hexadecimal digits, or a tuple\r | |
59 | of six integer fields (with 32-bit, 16-bit, 16-bit, 8-bit, 8-bit, and\r | |
60 | 48-bit values respectively) as an argument named 'fields', or a string\r | |
61 | of 16 bytes (with all the integer fields in big-endian order) as an\r | |
62 | argument named 'bytes', or a string of 16 bytes (with the first three\r | |
63 | fields in little-endian order) as an argument named 'bytes_le', or a\r | |
64 | single 128-bit integer as an argument named 'int'.\r | |
65 | \r | |
66 | UUIDs have these read-only attributes:\r | |
67 | \r | |
68 | bytes the UUID as a 16-byte string (containing the six\r | |
69 | integer fields in big-endian byte order)\r | |
70 | \r | |
71 | bytes_le the UUID as a 16-byte string (with time_low, time_mid,\r | |
72 | and time_hi_version in little-endian byte order)\r | |
73 | \r | |
74 | fields a tuple of the six integer fields of the UUID,\r | |
75 | which are also available as six individual attributes\r | |
76 | and two derived attributes:\r | |
77 | \r | |
78 | time_low the first 32 bits of the UUID\r | |
79 | time_mid the next 16 bits of the UUID\r | |
80 | time_hi_version the next 16 bits of the UUID\r | |
81 | clock_seq_hi_variant the next 8 bits of the UUID\r | |
82 | clock_seq_low the next 8 bits of the UUID\r | |
83 | node the last 48 bits of the UUID\r | |
84 | \r | |
85 | time the 60-bit timestamp\r | |
86 | clock_seq the 14-bit sequence number\r | |
87 | \r | |
88 | hex the UUID as a 32-character hexadecimal string\r | |
89 | \r | |
90 | int the UUID as a 128-bit integer\r | |
91 | \r | |
92 | urn the UUID as a URN as specified in RFC 4122\r | |
93 | \r | |
94 | variant the UUID variant (one of the constants RESERVED_NCS,\r | |
95 | RFC_4122, RESERVED_MICROSOFT, or RESERVED_FUTURE)\r | |
96 | \r | |
97 | version the UUID version number (1 through 5, meaningful only\r | |
98 | when the variant is RFC_4122)\r | |
99 | """\r | |
100 | \r | |
101 | def __init__(self, hex=None, bytes=None, bytes_le=None, fields=None,\r | |
102 | int=None, version=None):\r | |
103 | r"""Create a UUID from either a string of 32 hexadecimal digits,\r | |
104 | a string of 16 bytes as the 'bytes' argument, a string of 16 bytes\r | |
105 | in little-endian order as the 'bytes_le' argument, a tuple of six\r | |
106 | integers (32-bit time_low, 16-bit time_mid, 16-bit time_hi_version,\r | |
107 | 8-bit clock_seq_hi_variant, 8-bit clock_seq_low, 48-bit node) as\r | |
108 | the 'fields' argument, or a single 128-bit integer as the 'int'\r | |
109 | argument. When a string of hex digits is given, curly braces,\r | |
110 | hyphens, and a URN prefix are all optional. For example, these\r | |
111 | expressions all yield the same UUID:\r | |
112 | \r | |
113 | UUID('{12345678-1234-5678-1234-567812345678}')\r | |
114 | UUID('12345678123456781234567812345678')\r | |
115 | UUID('urn:uuid:12345678-1234-5678-1234-567812345678')\r | |
116 | UUID(bytes='\x12\x34\x56\x78'*4)\r | |
117 | UUID(bytes_le='\x78\x56\x34\x12\x34\x12\x78\x56' +\r | |
118 | '\x12\x34\x56\x78\x12\x34\x56\x78')\r | |
119 | UUID(fields=(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x567812345678))\r | |
120 | UUID(int=0x12345678123456781234567812345678)\r | |
121 | \r | |
122 | Exactly one of 'hex', 'bytes', 'bytes_le', 'fields', or 'int' must\r | |
123 | be given. The 'version' argument is optional; if given, the resulting\r | |
124 | UUID will have its variant and version set according to RFC 4122,\r | |
125 | overriding the given 'hex', 'bytes', 'bytes_le', 'fields', or 'int'.\r | |
126 | """\r | |
127 | \r | |
128 | if [hex, bytes, bytes_le, fields, int].count(None) != 4:\r | |
129 | raise TypeError('need one of hex, bytes, bytes_le, fields, or int')\r | |
130 | if hex is not None:\r | |
131 | hex = hex.replace('urn:', '').replace('uuid:', '')\r | |
132 | hex = hex.strip('{}').replace('-', '')\r | |
133 | if len(hex) != 32:\r | |
134 | raise ValueError('badly formed hexadecimal UUID string')\r | |
135 | int = long(hex, 16)\r | |
136 | if bytes_le is not None:\r | |
137 | if len(bytes_le) != 16:\r | |
138 | raise ValueError('bytes_le is not a 16-char string')\r | |
139 | bytes = (bytes_le[3] + bytes_le[2] + bytes_le[1] + bytes_le[0] +\r | |
140 | bytes_le[5] + bytes_le[4] + bytes_le[7] + bytes_le[6] +\r | |
141 | bytes_le[8:])\r | |
142 | if bytes is not None:\r | |
143 | if len(bytes) != 16:\r | |
144 | raise ValueError('bytes is not a 16-char string')\r | |
145 | int = long(('%02x'*16) % tuple(map(ord, bytes)), 16)\r | |
146 | if fields is not None:\r | |
147 | if len(fields) != 6:\r | |
148 | raise ValueError('fields is not a 6-tuple')\r | |
149 | (time_low, time_mid, time_hi_version,\r | |
150 | clock_seq_hi_variant, clock_seq_low, node) = fields\r | |
151 | if not 0 <= time_low < 1<<32L:\r | |
152 | raise ValueError('field 1 out of range (need a 32-bit value)')\r | |
153 | if not 0 <= time_mid < 1<<16L:\r | |
154 | raise ValueError('field 2 out of range (need a 16-bit value)')\r | |
155 | if not 0 <= time_hi_version < 1<<16L:\r | |
156 | raise ValueError('field 3 out of range (need a 16-bit value)')\r | |
157 | if not 0 <= clock_seq_hi_variant < 1<<8L:\r | |
158 | raise ValueError('field 4 out of range (need an 8-bit value)')\r | |
159 | if not 0 <= clock_seq_low < 1<<8L:\r | |
160 | raise ValueError('field 5 out of range (need an 8-bit value)')\r | |
161 | if not 0 <= node < 1<<48L:\r | |
162 | raise ValueError('field 6 out of range (need a 48-bit value)')\r | |
163 | clock_seq = (clock_seq_hi_variant << 8L) | clock_seq_low\r | |
164 | int = ((time_low << 96L) | (time_mid << 80L) |\r | |
165 | (time_hi_version << 64L) | (clock_seq << 48L) | node)\r | |
166 | if int is not None:\r | |
167 | if not 0 <= int < 1<<128L:\r | |
168 | raise ValueError('int is out of range (need a 128-bit value)')\r | |
169 | if version is not None:\r | |
170 | if not 1 <= version <= 5:\r | |
171 | raise ValueError('illegal version number')\r | |
172 | # Set the variant to RFC 4122.\r | |
173 | int &= ~(0xc000 << 48L)\r | |
174 | int |= 0x8000 << 48L\r | |
175 | # Set the version number.\r | |
176 | int &= ~(0xf000 << 64L)\r | |
177 | int |= version << 76L\r | |
178 | self.__dict__['int'] = int\r | |
179 | \r | |
180 | def __cmp__(self, other):\r | |
181 | if isinstance(other, UUID):\r | |
182 | return cmp(self.int, other.int)\r | |
183 | return NotImplemented\r | |
184 | \r | |
185 | def __hash__(self):\r | |
186 | return hash(self.int)\r | |
187 | \r | |
188 | def __int__(self):\r | |
189 | return self.int\r | |
190 | \r | |
191 | def __repr__(self):\r | |
192 | return 'UUID(%r)' % str(self)\r | |
193 | \r | |
194 | def __setattr__(self, name, value):\r | |
195 | raise TypeError('UUID objects are immutable')\r | |
196 | \r | |
197 | def __str__(self):\r | |
198 | hex = '%032x' % self.int\r | |
199 | return '%s-%s-%s-%s-%s' % (\r | |
200 | hex[:8], hex[8:12], hex[12:16], hex[16:20], hex[20:])\r | |
201 | \r | |
202 | def get_bytes(self):\r | |
203 | bytes = ''\r | |
204 | for shift in range(0, 128, 8):\r | |
205 | bytes = chr((self.int >> shift) & 0xff) + bytes\r | |
206 | return bytes\r | |
207 | \r | |
208 | bytes = property(get_bytes)\r | |
209 | \r | |
210 | def get_bytes_le(self):\r | |
211 | bytes = self.bytes\r | |
212 | return (bytes[3] + bytes[2] + bytes[1] + bytes[0] +\r | |
213 | bytes[5] + bytes[4] + bytes[7] + bytes[6] + bytes[8:])\r | |
214 | \r | |
215 | bytes_le = property(get_bytes_le)\r | |
216 | \r | |
217 | def get_fields(self):\r | |
218 | return (self.time_low, self.time_mid, self.time_hi_version,\r | |
219 | self.clock_seq_hi_variant, self.clock_seq_low, self.node)\r | |
220 | \r | |
221 | fields = property(get_fields)\r | |
222 | \r | |
223 | def get_time_low(self):\r | |
224 | return self.int >> 96L\r | |
225 | \r | |
226 | time_low = property(get_time_low)\r | |
227 | \r | |
228 | def get_time_mid(self):\r | |
229 | return (self.int >> 80L) & 0xffff\r | |
230 | \r | |
231 | time_mid = property(get_time_mid)\r | |
232 | \r | |
233 | def get_time_hi_version(self):\r | |
234 | return (self.int >> 64L) & 0xffff\r | |
235 | \r | |
236 | time_hi_version = property(get_time_hi_version)\r | |
237 | \r | |
238 | def get_clock_seq_hi_variant(self):\r | |
239 | return (self.int >> 56L) & 0xff\r | |
240 | \r | |
241 | clock_seq_hi_variant = property(get_clock_seq_hi_variant)\r | |
242 | \r | |
243 | def get_clock_seq_low(self):\r | |
244 | return (self.int >> 48L) & 0xff\r | |
245 | \r | |
246 | clock_seq_low = property(get_clock_seq_low)\r | |
247 | \r | |
248 | def get_time(self):\r | |
249 | return (((self.time_hi_version & 0x0fffL) << 48L) |\r | |
250 | (self.time_mid << 32L) | self.time_low)\r | |
251 | \r | |
252 | time = property(get_time)\r | |
253 | \r | |
254 | def get_clock_seq(self):\r | |
255 | return (((self.clock_seq_hi_variant & 0x3fL) << 8L) |\r | |
256 | self.clock_seq_low)\r | |
257 | \r | |
258 | clock_seq = property(get_clock_seq)\r | |
259 | \r | |
260 | def get_node(self):\r | |
261 | return self.int & 0xffffffffffff\r | |
262 | \r | |
263 | node = property(get_node)\r | |
264 | \r | |
265 | def get_hex(self):\r | |
266 | return '%032x' % self.int\r | |
267 | \r | |
268 | hex = property(get_hex)\r | |
269 | \r | |
270 | def get_urn(self):\r | |
271 | return 'urn:uuid:' + str(self)\r | |
272 | \r | |
273 | urn = property(get_urn)\r | |
274 | \r | |
275 | def get_variant(self):\r | |
276 | if not self.int & (0x8000 << 48L):\r | |
277 | return RESERVED_NCS\r | |
278 | elif not self.int & (0x4000 << 48L):\r | |
279 | return RFC_4122\r | |
280 | elif not self.int & (0x2000 << 48L):\r | |
281 | return RESERVED_MICROSOFT\r | |
282 | else:\r | |
283 | return RESERVED_FUTURE\r | |
284 | \r | |
285 | variant = property(get_variant)\r | |
286 | \r | |
287 | def get_version(self):\r | |
288 | # The version bits are only meaningful for RFC 4122 UUIDs.\r | |
289 | if self.variant == RFC_4122:\r | |
290 | return int((self.int >> 76L) & 0xf)\r | |
291 | \r | |
292 | version = property(get_version)\r | |
293 | \r | |
294 | def _find_mac(command, args, hw_identifiers, get_index):\r | |
295 | import os\r | |
296 | for dir in ['', '/sbin/', '/usr/sbin']:\r | |
297 | executable = os.path.join(dir, command)\r | |
298 | if not os.path.exists(executable):\r | |
299 | continue\r | |
300 | \r | |
301 | try:\r | |
302 | # LC_ALL to get English output, 2>/dev/null to\r | |
303 | # prevent output on stderr\r | |
304 | cmd = 'LC_ALL=C %s %s 2>/dev/null' % (executable, args)\r | |
305 | with os.popen(cmd) as pipe:\r | |
306 | for line in pipe:\r | |
307 | words = line.lower().split()\r | |
308 | for i in range(len(words)):\r | |
309 | if words[i] in hw_identifiers:\r | |
310 | return int(\r | |
311 | words[get_index(i)].replace(':', ''), 16)\r | |
312 | except IOError:\r | |
313 | continue\r | |
314 | return None\r | |
315 | \r | |
316 | def _ifconfig_getnode():\r | |
317 | """Get the hardware address on Unix by running ifconfig."""\r | |
318 | \r | |
319 | # This works on Linux ('' or '-a'), Tru64 ('-av'), but not all Unixes.\r | |
320 | for args in ('', '-a', '-av'):\r | |
321 | mac = _find_mac('ifconfig', args, ['hwaddr', 'ether'], lambda i: i+1)\r | |
322 | if mac:\r | |
323 | return mac\r | |
324 | \r | |
325 | import socket\r | |
326 | ip_addr = socket.gethostbyname(socket.gethostname())\r | |
327 | \r | |
328 | # Try getting the MAC addr from arp based on our IP address (Solaris).\r | |
329 | mac = _find_mac('arp', '-an', [ip_addr], lambda i: -1)\r | |
330 | if mac:\r | |
331 | return mac\r | |
332 | \r | |
333 | # This might work on HP-UX.\r | |
334 | mac = _find_mac('lanscan', '-ai', ['lan0'], lambda i: 0)\r | |
335 | if mac:\r | |
336 | return mac\r | |
337 | \r | |
338 | return None\r | |
339 | \r | |
340 | def _ipconfig_getnode():\r | |
341 | """Get the hardware address on Windows by running ipconfig.exe."""\r | |
342 | import os, re\r | |
343 | dirs = ['', r'c:\windows\system32', r'c:\winnt\system32']\r | |
344 | try:\r | |
345 | import ctypes\r | |
346 | buffer = ctypes.create_string_buffer(300)\r | |
347 | ctypes.windll.kernel32.GetSystemDirectoryA(buffer, 300)\r | |
348 | dirs.insert(0, buffer.value.decode('mbcs'))\r | |
349 | except:\r | |
350 | pass\r | |
351 | for dir in dirs:\r | |
352 | try:\r | |
353 | pipe = os.popen(os.path.join(dir, 'ipconfig') + ' /all')\r | |
354 | except IOError:\r | |
355 | continue\r | |
356 | else:\r | |
357 | for line in pipe:\r | |
358 | value = line.split(':')[-1].strip().lower()\r | |
359 | if re.match('([0-9a-f][0-9a-f]-){5}[0-9a-f][0-9a-f]', value):\r | |
360 | return int(value.replace('-', ''), 16)\r | |
361 | finally:\r | |
362 | pipe.close()\r | |
363 | \r | |
364 | def _netbios_getnode():\r | |
365 | """Get the hardware address on Windows using NetBIOS calls.\r | |
366 | See http://support.microsoft.com/kb/118623 for details."""\r | |
367 | import win32wnet, netbios\r | |
368 | ncb = netbios.NCB()\r | |
369 | ncb.Command = netbios.NCBENUM\r | |
370 | ncb.Buffer = adapters = netbios.LANA_ENUM()\r | |
371 | adapters._pack()\r | |
372 | if win32wnet.Netbios(ncb) != 0:\r | |
373 | return\r | |
374 | adapters._unpack()\r | |
375 | for i in range(adapters.length):\r | |
376 | ncb.Reset()\r | |
377 | ncb.Command = netbios.NCBRESET\r | |
378 | ncb.Lana_num = ord(adapters.lana[i])\r | |
379 | if win32wnet.Netbios(ncb) != 0:\r | |
380 | continue\r | |
381 | ncb.Reset()\r | |
382 | ncb.Command = netbios.NCBASTAT\r | |
383 | ncb.Lana_num = ord(adapters.lana[i])\r | |
384 | ncb.Callname = '*'.ljust(16)\r | |
385 | ncb.Buffer = status = netbios.ADAPTER_STATUS()\r | |
386 | if win32wnet.Netbios(ncb) != 0:\r | |
387 | continue\r | |
388 | status._unpack()\r | |
389 | bytes = map(ord, status.adapter_address)\r | |
390 | return ((bytes[0]<<40L) + (bytes[1]<<32L) + (bytes[2]<<24L) +\r | |
391 | (bytes[3]<<16L) + (bytes[4]<<8L) + bytes[5])\r | |
392 | \r | |
393 | # Thanks to Thomas Heller for ctypes and for his help with its use here.\r | |
394 | \r | |
395 | # If ctypes is available, use it to find system routines for UUID generation.\r | |
396 | _uuid_generate_random = _uuid_generate_time = _UuidCreate = None\r | |
397 | try:\r | |
398 | import ctypes, ctypes.util\r | |
399 | \r | |
400 | # The uuid_generate_* routines are provided by libuuid on at least\r | |
401 | # Linux and FreeBSD, and provided by libc on Mac OS X.\r | |
402 | for libname in ['uuid', 'c']:\r | |
403 | try:\r | |
404 | lib = ctypes.CDLL(ctypes.util.find_library(libname))\r | |
405 | except:\r | |
406 | continue\r | |
407 | if hasattr(lib, 'uuid_generate_random'):\r | |
408 | _uuid_generate_random = lib.uuid_generate_random\r | |
409 | if hasattr(lib, 'uuid_generate_time'):\r | |
410 | _uuid_generate_time = lib.uuid_generate_time\r | |
411 | \r | |
412 | # The uuid_generate_* functions are broken on MacOS X 10.5, as noted\r | |
413 | # in issue #8621 the function generates the same sequence of values\r | |
414 | # in the parent process and all children created using fork (unless\r | |
415 | # those children use exec as well).\r | |
416 | #\r | |
417 | # Assume that the uuid_generate functions are broken from 10.5 onward,\r | |
418 | # the test can be adjusted when a later version is fixed.\r | |
419 | import sys\r | |
420 | if sys.platform == 'darwin':\r | |
421 | import os\r | |
422 | if int(os.uname()[2].split('.')[0]) >= 9:\r | |
423 | _uuid_generate_random = _uuid_generate_time = None\r | |
424 | \r | |
425 | # On Windows prior to 2000, UuidCreate gives a UUID containing the\r | |
426 | # hardware address. On Windows 2000 and later, UuidCreate makes a\r | |
427 | # random UUID and UuidCreateSequential gives a UUID containing the\r | |
428 | # hardware address. These routines are provided by the RPC runtime.\r | |
429 | # NOTE: at least on Tim's WinXP Pro SP2 desktop box, while the last\r | |
430 | # 6 bytes returned by UuidCreateSequential are fixed, they don't appear\r | |
431 | # to bear any relationship to the MAC address of any network device\r | |
432 | # on the box.\r | |
433 | try:\r | |
434 | lib = ctypes.windll.rpcrt4\r | |
435 | except:\r | |
436 | lib = None\r | |
437 | _UuidCreate = getattr(lib, 'UuidCreateSequential',\r | |
438 | getattr(lib, 'UuidCreate', None))\r | |
439 | except:\r | |
440 | pass\r | |
441 | \r | |
442 | def _unixdll_getnode():\r | |
443 | """Get the hardware address on Unix using ctypes."""\r | |
444 | _buffer = ctypes.create_string_buffer(16)\r | |
445 | _uuid_generate_time(_buffer)\r | |
446 | return UUID(bytes=_buffer.raw).node\r | |
447 | \r | |
448 | def _windll_getnode():\r | |
449 | """Get the hardware address on Windows using ctypes."""\r | |
450 | _buffer = ctypes.create_string_buffer(16)\r | |
451 | if _UuidCreate(_buffer) == 0:\r | |
452 | return UUID(bytes=_buffer.raw).node\r | |
453 | \r | |
454 | def _random_getnode():\r | |
455 | """Get a random node ID, with eighth bit set as suggested by RFC 4122."""\r | |
456 | import random\r | |
457 | return random.randrange(0, 1<<48L) | 0x010000000000L\r | |
458 | \r | |
459 | _node = None\r | |
460 | \r | |
461 | def getnode():\r | |
462 | """Get the hardware address as a 48-bit positive integer.\r | |
463 | \r | |
464 | The first time this runs, it may launch a separate program, which could\r | |
465 | be quite slow. If all attempts to obtain the hardware address fail, we\r | |
466 | choose a random 48-bit number with its eighth bit set to 1 as recommended\r | |
467 | in RFC 4122.\r | |
468 | """\r | |
469 | \r | |
470 | global _node\r | |
471 | if _node is not None:\r | |
472 | return _node\r | |
473 | \r | |
474 | import sys\r | |
475 | if sys.platform == 'win32':\r | |
476 | getters = [_windll_getnode, _netbios_getnode, _ipconfig_getnode]\r | |
477 | else:\r | |
478 | getters = [_unixdll_getnode, _ifconfig_getnode]\r | |
479 | \r | |
480 | for getter in getters + [_random_getnode]:\r | |
481 | try:\r | |
482 | _node = getter()\r | |
483 | except:\r | |
484 | continue\r | |
485 | if _node is not None:\r | |
486 | return _node\r | |
487 | \r | |
488 | _last_timestamp = None\r | |
489 | \r | |
490 | def uuid1(node=None, clock_seq=None):\r | |
491 | """Generate a UUID from a host ID, sequence number, and the current time.\r | |
492 | If 'node' is not given, getnode() is used to obtain the hardware\r | |
493 | address. If 'clock_seq' is given, it is used as the sequence number;\r | |
494 | otherwise a random 14-bit sequence number is chosen."""\r | |
495 | \r | |
496 | # When the system provides a version-1 UUID generator, use it (but don't\r | |
497 | # use UuidCreate here because its UUIDs don't conform to RFC 4122).\r | |
498 | if _uuid_generate_time and node is clock_seq is None:\r | |
499 | _buffer = ctypes.create_string_buffer(16)\r | |
500 | _uuid_generate_time(_buffer)\r | |
501 | return UUID(bytes=_buffer.raw)\r | |
502 | \r | |
503 | global _last_timestamp\r | |
504 | import time\r | |
505 | nanoseconds = int(time.time() * 1e9)\r | |
506 | # 0x01b21dd213814000 is the number of 100-ns intervals between the\r | |
507 | # UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.\r | |
508 | timestamp = int(nanoseconds//100) + 0x01b21dd213814000L\r | |
509 | if _last_timestamp is not None and timestamp <= _last_timestamp:\r | |
510 | timestamp = _last_timestamp + 1\r | |
511 | _last_timestamp = timestamp\r | |
512 | if clock_seq is None:\r | |
513 | import random\r | |
514 | clock_seq = random.randrange(1<<14L) # instead of stable storage\r | |
515 | time_low = timestamp & 0xffffffffL\r | |
516 | time_mid = (timestamp >> 32L) & 0xffffL\r | |
517 | time_hi_version = (timestamp >> 48L) & 0x0fffL\r | |
518 | clock_seq_low = clock_seq & 0xffL\r | |
519 | clock_seq_hi_variant = (clock_seq >> 8L) & 0x3fL\r | |
520 | if node is None:\r | |
521 | node = getnode()\r | |
522 | return UUID(fields=(time_low, time_mid, time_hi_version,\r | |
523 | clock_seq_hi_variant, clock_seq_low, node), version=1)\r | |
524 | \r | |
525 | def uuid3(namespace, name):\r | |
526 | """Generate a UUID from the MD5 hash of a namespace UUID and a name."""\r | |
527 | from hashlib import md5\r | |
528 | hash = md5(namespace.bytes + name).digest()\r | |
529 | return UUID(bytes=hash[:16], version=3)\r | |
530 | \r | |
531 | def uuid4():\r | |
532 | """Generate a random UUID."""\r | |
533 | \r | |
534 | # When the system provides a version-4 UUID generator, use it.\r | |
535 | if _uuid_generate_random:\r | |
536 | _buffer = ctypes.create_string_buffer(16)\r | |
537 | _uuid_generate_random(_buffer)\r | |
538 | return UUID(bytes=_buffer.raw)\r | |
539 | \r | |
540 | # Otherwise, get randomness from urandom or the 'random' module.\r | |
541 | try:\r | |
542 | import os\r | |
543 | return UUID(bytes=os.urandom(16), version=4)\r | |
544 | except:\r | |
545 | import random\r | |
546 | bytes = [chr(random.randrange(256)) for i in range(16)]\r | |
547 | return UUID(bytes=bytes, version=4)\r | |
548 | \r | |
549 | def uuid5(namespace, name):\r | |
550 | """Generate a UUID from the SHA-1 hash of a namespace UUID and a name."""\r | |
551 | from hashlib import sha1\r | |
552 | hash = sha1(namespace.bytes + name).digest()\r | |
553 | return UUID(bytes=hash[:16], version=5)\r | |
554 | \r | |
555 | # The following standard UUIDs are for use with uuid3() or uuid5().\r | |
556 | \r | |
557 | NAMESPACE_DNS = UUID('6ba7b810-9dad-11d1-80b4-00c04fd430c8')\r | |
558 | NAMESPACE_URL = UUID('6ba7b811-9dad-11d1-80b4-00c04fd430c8')\r | |
559 | NAMESPACE_OID = UUID('6ba7b812-9dad-11d1-80b4-00c04fd430c8')\r | |
560 | NAMESPACE_X500 = UUID('6ba7b814-9dad-11d1-80b4-00c04fd430c8')\r |