Repository navigation
Expand file tree
/
Copy pathhelpers.py
More file actions
465 lines (380 loc) · 14.8 KB
/
Copy pathhelpers.py
File metadata and controls
465 lines (380 loc) · 14.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
# -*- coding: utf-8 -*-
# Minio Python Library for Amazon S3 Compatible Cloud Storage, (C) 2015 Minio, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
minio.helpers
This module implements all helper functions.
:copyright: (c) 2015 by Minio, Inc.
:license: Apache 2.0, see LICENSE for more details.
"""
from __future__ import absolute_import
import io
import collections
import binascii
import hashlib
import re
import os
import errno
import math
from .compat import urlsplit, urlencode
from .error import (InvalidBucketError, InvalidEndpointError,
InvalidArgumentError)
# Constants
MAX_MULTIPART_COUNT = 10000 # 10000 parts
MAX_MULTIPART_OBJECT_SIZE = 5 * 1024 * 1024 * 1024 * 1024 # 5TiB
MIN_OBJECT_SIZE = 5 * 1024 * 1024 # 5MiB
_VALID_BUCKETNAME_REGEX = re.compile('^[a-z0-9][a-z0-9\\.\\-]+[a-z0-9]$')
_ALLOWED_HOSTNAME_REGEX = re.compile(
'^((?!-)[A-Z\\d-]{1,63}(?<!-)\\.)*((?!-)[A-Z\\d-]{1,63}(?<!-))$',
re.IGNORECASE)
def dump_http(method, url, request_headers, response, output_stream):
"""
Dump all headers and response headers into output_stream.
:param request_headers: Dictionary of HTTP request headers.
:param response_headers: Dictionary of HTTP response headers.
:param output_stream: Stream where the request is being dumped at.
"""
# Start header.
output_stream.write('---------START-HTTP---------\n')
# Get parsed url.
parsed_url = urlsplit(url)
# Dump all request headers recursively.
http_path = parsed_url.path
if parsed_url.query:
http_path = http_path + '?' + parsed_url.query
output_stream.write('{0} {1} HTTP/1.1\n'.format(method,
http_path))
for k, v in list(request_headers.items()):
if k is 'authorization':
# Redact signature header value from trace logs.
v = re.sub(r'Signature=([[0-9a-f]+)', 'Signature=*REDACTED*', v)
output_stream.write('{0}: {1}\n'.format(k.title(), v))
# Write a new line.
output_stream.write('\n')
# Write response status code.
output_stream.write('HTTP/1.1 {0}\n'.format(response.status))
# Dump all response headers recursively.
for k, v in list(response.getheaders().items()):
output_stream.write('{0}: {1}\n'.format(k.title(), v))
# For all errors write all the available response body.
if response.status != 200 and \
response.status != 204 and response.status != 206:
output_stream.write('{0}'.format(response.read()))
# End header.
output_stream.write('---------END-HTTP---------\n')
def mkdir_p(path):
"""
Recursively creates parent and sub directories.
:param path:
"""
try:
os.makedirs(path)
except OSError as exc: # Python >2.5
if exc.errno == errno.EEXIST and os.path.isdir(path):
pass
else:
raise
class PartMetadata(object):
"""
Parts manager split parts metadata :class:`PartMetadata <PartMetadata>`.
:param data: Part writer object backed by temporary file.
:param md5digest: Md5sum digest of the part.
:param sha256digest: Sha256sum digest of the part.
:param size: Size of the part.
"""
def __init__(self, data, md5digest, sha256digest, size):
self.data = data
self.md5digest = md5digest
self.sha256digest = sha256digest
self.size = size
def parts_manager(data, part_size=5*1024*1024):
"""
Reads data and provides temporary files of a given size.
:param data: Input reader object which needs to be saved.
:param part_size: Individual part number defaults to 5MB.
:return: Returns :class:`PartMetadata <PartMetadata>`
"""
tmpdata = io.BytesIO()
md5hasher = hashlib.md5()
sha256hasher = hashlib.sha256()
total_read = 0
while total_read < part_size:
current_data = data.read(1024)
if not current_data or len(current_data) == 0:
break
tmpdata.write(current_data)
md5hasher.update(current_data)
sha256hasher.update(current_data)
total_read = total_read + len(current_data)
return PartMetadata(tmpdata, md5hasher.digest(),
sha256hasher.digest(), total_read)
def ignore_headers(headers_to_sign):
"""
Ignore headers.
"""
# Excerpts from @lsegal -
# https://github.com/aws/aws-sdk-js/issues/659#issuecomment-120477258
#
# User-Agent:
#
# This is ignored from signing because signing this causes problems
# with generating pre-signed URLs (that are executed by other agents)
# or when customers pass requests through proxies, which may modify
# the user-agent.
#
# Content-Length:
#
# This is ignored from signing because generating a pre-signed URL
# should not provide a content-length constraint, specifically when
# vending a S3 pre-signed PUT URL. The corollary to this is that when
# sending regular requests (non-pre-signed), the signature contains
# a checksum of the body, which implicitly validates the payload
# length (since changing the number of bytes would change the
# checksum) and therefore this header is not valuable in the
# signature.
#
# Content-Type:
#
# Signing this header causes quite a number of problems in browser
# environments, where browsers like to modify and normalize the
# content-type header in different ways. There is more information
# on this in https://github.com/aws/aws-sdk-js/issues/244. Avoiding
# this field simplifies logic and reduces the possibility of bugs.
#
# Authorization:
#
# Is skipped for obvious reasons
ignored_headers = ['Authorization', 'Content-Length',
'Content-Type', 'User-Agent']
for ignored_header in ignored_headers:
if ignored_header in headers_to_sign:
del headers_to_sign[ignored_header]
return headers_to_sign
AWS_S3_ENDPOINT_MAP = {
'us-east-1': 's3.amazonaws.com',
'us-west-2': 's3-us-west-2.amazonaws.com',
'us-west-1': 's3-us-west-1.amazonaws.com',
'eu-west-1': 's3-eu-west-1.amazonaws.com',
'sa-east-1': 's3-sa-east-1.amazonaws.com',
'eu-central-1': 's3-eu-central-1.amazonaws.com',
'ap-southeast-1': 's3-ap-southeast-1.amazonaws.com',
'ap-northeast-1': 's3-ap-northeast-1.amazonaws.com',
'ap-northeast-2': 's3-ap-northeast-2.amazonaws.com',
}
def get_s3_endpoint(region):
if region in AWS_S3_ENDPOINT_MAP:
return AWS_S3_ENDPOINT_MAP[region]
return 's3.amazonaws.com'
def get_target_url(endpoint_url, bucket_name=None, object_name=None,
bucket_region='us-east-1', query=None):
"""
Construct final target url.
:param endpoint_url: Target endpoint url where request is served to.
:param bucket_name: Bucket component for the target url.
:param object_name: Object component for the target url.
:param bucket_region: Bucket region for the target url.
:param query: Query parameters as a *dict* for the target url.
:return: Returns final target url as *str*.
"""
# New url
url = None
# Parse url
parsed_url = urlsplit(endpoint_url)
# Get new host, scheme.
host = parsed_url.netloc
if 's3.amazonaws.com' in host:
host = get_s3_endpoint(bucket_region)
scheme = parsed_url.scheme
url = scheme + '://' + host
if bucket_name:
# Save if target url will have buckets which suppport
# virtual host.
is_virtual_host_style = is_virtual_host(endpoint_url,
bucket_name)
if is_virtual_host_style:
url = (scheme + '://' + bucket_name + '.' + host)
else:
url = (scheme + '://' + host + '/' + bucket_name)
url_components = [url]
url_components.append('/')
if object_name:
object_name = encode_object_name(object_name)
url_components.append(object_name)
if query:
ordered_query = collections.OrderedDict(sorted(query.items()))
query_components = []
for component_key in ordered_query:
single_component = [component_key]
if ordered_query[component_key] is not None:
single_component.append('=')
encoded_query = urlencode(
str(ordered_query[component_key])).replace(
'/',
'%2F')
single_component.append(encoded_query)
query_components.append(''.join(single_component))
query_string = '&'.join(query_components)
if query_string:
url_components.append('?')
url_components.append(query_string)
return ''.join(url_components)
def is_valid_endpoint(endpoint):
"""
Verify if endpoint is valid.
:type endpoint: string
:param endpoint: An endpoint. Must have at least a scheme and a hostname.
:return: True if the endpoint is valid. Raise :exc:`InvalidEndpointError`
otherwise.
"""
try:
if urlsplit(endpoint).scheme:
raise InvalidEndpointError('Hostname cannot have a scheme.')
hostname = endpoint.split(':')[0]
if hostname is None:
raise InvalidEndpointError('Hostname cannot be empty.')
if len(hostname) > 255:
raise InvalidEndpointError('Hostname cannot be greater than 255.')
if hostname[-1] == '.':
hostname = hostname[:-1]
if not _ALLOWED_HOSTNAME_REGEX.match(hostname):
raise InvalidEndpointError('Hostname does not meet URL standards.')
if hostname.endswith('.amazonaws.com') and \
(hostname != 's3.amazonaws.com'):
raise InvalidEndpointError('Amazon S3 hostname should be '
's3.amazonaws.com.')
except AttributeError as error:
raise TypeError(error)
return True
def is_virtual_host(endpoint_url, bucket_name):
"""
Check to see if the ``bucket_name`` can be part of virtual host
style.
:param endpoint_url: Endpoint url which will be used for virtual host.
:param bucket_name: Bucket name to be validated against.
"""
is_valid_bucket_name(bucket_name)
parsed_url = urlsplit(endpoint_url)
# bucket_name can be valid but '.' in the hostname will fail
# SSL certificate validation. So do not use host-style for
# such buckets.
if 'https' in parsed_url.scheme and '.' in bucket_name:
return False
if 's3.amazonaws.com' in parsed_url.netloc:
return True
return False
def is_valid_bucket_name(bucket_name):
"""
Check to see if the ``bucket_name`` complies with the
restricted DNS naming conventions necessary to allow
access via virtual-hosting style.
:param bucket_name: Bucket name in *str*.
:return: True if the bucket is valid. Raise :exc:`InvalidBucketError`
otherwise.
"""
# Verify bucket name length.
if len(bucket_name) < 3:
raise InvalidBucketError('Bucket name cannot be less than'
' 3 characters.')
if len(bucket_name) > 63:
raise InvalidBucketError('Bucket name cannot be more than'
' 63 characters.')
if '..' in bucket_name:
raise InvalidBucketError('Bucket name cannot have successive'
' periods.')
match = _VALID_BUCKETNAME_REGEX.match(bucket_name)
if match is None or match.end() != len(bucket_name):
raise InvalidBucketError('Bucket name does not follow S3 standards.'
' Bucket: {0}'.format(bucket_name))
return True
def is_non_empty_string(input_string):
"""
Validate if non empty string
:param input_string: Input is a *str*.
:return: True if input is string and non empty.
Raise :exc:`Exception` otherwise.
"""
try:
if not input_string.strip():
raise ValueError()
except AttributeError as error:
raise TypeError(error)
return True
def encode_object_name(object_name):
"""
URL encode input object name.
:param object_name: Un-encoded object name.
:return: URL encoded input object name.
"""
is_non_empty_string(object_name)
return urlencode(object_name)
def get_sha256(content):
"""
Calculate sha256 digest of input byte array.
:param content: Input byte array.
:return: sha256 digest of input byte array.
"""
if len(content) == 0:
content = b''
hasher = hashlib.sha256()
hasher.update(content)
return hasher.digest()
def get_md5(content):
"""
Calculate md5 digest of input byte array.
:param content: Input byte array.
:return: md5 digest of input byte array.
"""
if len(content) == 0:
content = b''
hasher = hashlib.md5()
hasher.update(content)
return hasher.digest()
def encode_to_base64(content):
"""
Calculate base64 of input byte array.
:param content: Input byte array.
:return: base64 encoding of input byte array.
"""
return binascii.b2a_base64(content).strip().decode('utf-8')
def encode_to_hex(content):
"""
Calculate hex for input byte array.
:param content: Input byte array.
:return: hexlified input byte array.
"""
return binascii.hexlify(content)
def optimal_part_info(length):
"""
Calculate optimal part size for multipart uploads.
:param length: Input length to calculate part size of.
:return: Optimal part size.
"""
# object size is '-1' set it to 5TiB.
if length == -1:
length = MAX_MULTIPART_OBJECT_SIZE
if length > MAX_MULTIPART_OBJECT_SIZE:
raise InvalidArgumentError('Input content size is bigger '
' than allowed maximum of 5TiB.')
# Use floats for part size for all calculations to avoid
# overflows during float64 to int64 conversions.
part_size_float = math.ceil(length/MAX_MULTIPART_COUNT)
part_size_float = (math.ceil(part_size_float/MIN_OBJECT_SIZE)
* MIN_OBJECT_SIZE)
# Total parts count.
total_parts_count = int(math.ceil(length/part_size_float))
# Part size.
part_size = int(part_size_float)
# Last part size.
last_part_size = length - int(total_parts_count-1)*part_size
return total_parts_count, part_size, last_part_size