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sevencow.py
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sevencow.py
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# -*- coding: utf-8 -*-
import os
import hmac
import time
import json
import mimetypes
import functools
import hashlib
from urlparse import urlparse
from urllib import urlencode
from base64 import urlsafe_b64encode
import requests
version_info = (0, 2, 0)
VERSION = __version__ = '.'.join( map(str, version_info) )
"""
Usage:
cow = Cow(ACCESS_KEY, SECRET_KEY)
b = cow.get_bucket(BUCKET)
b.put('a')
b.stat('a')
b.delete('a')
b.copy('a', 'c')
b.move('a', 'c')
"""
RS_HOST = 'http://rs.qbox.me'
UP_HOST = 'http://up.qbox.me'
RSF_HOST = 'http://rsf.qbox.me'
class CowException(Exception):
def __init__(self, url, status_code, content):
self.url = url
self.status_code = status_code
self.content = content
Exception.__init__(self, content)
def signing(secret_key, data):
return urlsafe_b64encode(
hmac.new(secret_key, data, hashlib.sha1).digest()
)
def requests_error_handler(func):
@functools.wraps(func)
def deco(*args, **kwargs):
try:
return func(*args, **kwargs)
except AssertionError as e:
req = e.args[0]
raise CowException(
req.url, req.status_code, req.content
)
return deco
class UploadToken(object):
def __init__(self, access_key, secret_key, scope, ttl=3600):
self.access_key = access_key
self.secret_key = secret_key
self.scope = scope
self.ttl = ttl
self._token = None
self.generated_at = int(time.time())
@property
def token(self):
if int(time.time()) - self.generated_at > self.ttl - 60:
# 还有一分钟也认为过期了, make new token
self._token = None
if not self._token:
self._token = self._make_token()
return self._token
def _make_token(self):
self.generated_at = int(time.time())
info = {
'scope': self.scope,
'deadline': self.generated_at + self.ttl
}
info = urlsafe_b64encode(json.dumps(info))
token = signing(self.secret_key, info)
return '%s:%s:%s' % (self.access_key, token, info)
class AccessToken(object):
def __init__(self, access_key, secret_key, url, params=None):
self.access_key = access_key
self.secret_key = secret_key
self.url = url
self.params = params
self.token = self.build_token()
def build_token(self):
uri = urlparse(self.url)
token = uri.path
if uri.query:
token = '%s?%s' % (token, uri.query)
token = '%s\n' % token
if self.params:
if isinstance(self.params, basestring):
token += self.params
else:
token += urlencode(self.params)
return '%s:%s' % (self.access_key, signing(self.secret_key, token))
class Cow(object):
def __init__(self, access_key, secret_key):
self.access_key = access_key
self.secret_key = secret_key
self.upload_tokens = {}
self.stat = functools.partial(self._stat_rm_handler, 'stat')
self.delete = functools.partial(self._stat_rm_handler, 'delete')
self.copy = functools.partial(self._cp_mv_handler, 'copy')
self.move = functools.partial(self._cp_mv_handler, 'move')
def get_bucket(self, bucket):
"""对一个bucket的文件进行操作,
推荐使用此方法得到一个bucket对象,
然后对此bucket的操作就只用传递文件名即可
"""
return Bucket(self, bucket)
def generate_access_token(self, url, params=None):
return AccessToken(self.access_key, self.secret_key, url, params=params).token
def generate_upload_token(self, scope, ttl=3600):
"""上传文件的uploadToken"""
if scope not in self.upload_tokens:
self.upload_tokens[scope] = UploadToken(self.access_key, self.secret_key, scope, ttl=ttl)
return self.upload_tokens[scope].token
def build_requests_headers(self, token):
return {
'Content-Type': 'application/x-www-form-urlencoded',
'Authorization': 'QBox %s' % token
}
@requests_error_handler
def api_call(self, url, params=None):
token = self.generate_access_token(url, params=params)
if params:
res = requests.post(url, data=params, headers=self.build_requests_headers(token))
else:
res = requests.post(url, headers=self.build_requests_headers(token))
assert res.status_code == 200, res
return res.json() if res.text else ''
def list_buckets(self):
"""列出所有的buckets"""
url = '%s/buckets' % RS_HOST
return self.api_call(url)
def create_bucket(self, name):
"""不建议使用API建立bucket
测试发现API建立的bucket默认无法设置<bucket_name>.qiniudn.com的二级域名
请直接到web界面建立
"""
# url = '%s/mkbucket/%s' % (RS_HOST, name)
# return self.api_call(url)
raise RuntimeError("Please create bucket in web")
def drop_bucket(self, bucket):
"""删除整个bucket"""
url = '%s/drop/%s' % (RS_HOST, bucket)
return self.api_call(url)
def list_files(self, bucket, marker=None, limit=None, prefix=None):
"""列出bucket中的文件"""
query = ['bucket=%s' % bucket]
if marker:
query.append('marker=%s' % marker)
if limit:
query.append('limit=%s' % limit)
if prefix:
query.append('prefix=%s' % prefix)
url = '%s/list?%s' % (RSF_HOST, '&'.join(query))
return self.api_call(url)
@requests_error_handler
def put(self, scope, filename, data=None, keep_name=False, override=True):
"""
上传文件
:param scope: bucket name
:param filename: file name
:param data: file data
:param keep_name: if True, use file name, otherwise use the file data's md5 value
:param override: if True, override the same key file.
:return:
"""
if not data:
with open(filename, 'rb') as f:
data = f.read()
if keep_name:
upload_name = filename
else:
upload_name = hashlib.md5(data).hexdigest()
_, ext = os.path.splitext(filename)
upload_name += ext
url = '%s/upload' % UP_HOST
if override:
token = self.generate_upload_token('%s:%s' % (scope, upload_name))
else:
token = self.generate_upload_token(scope)
files = {'file': data}
action = '/rs-put/%s' % urlsafe_b64encode(
'%s:%s' % (scope, upload_name)
)
_type, _encoding = mimetypes.guess_type(filename)
if _type:
action += '/mimeType/%s' % urlsafe_b64encode(_type)
data = {
'auth': token,
'action': action,
}
res = requests.post(url, files=files, data=data)
assert res.status_code == 200, res
return res.json()
def _cp_mv_handler(self, action, args):
src_bucket, src_filename, des_bucket, des_filename = args
url = '%s/%s/%s/%s' % (
RS_HOST,
action,
urlsafe_b64encode('%s:%s' % (src_bucket, src_filename)),
urlsafe_b64encode('%s:%s' % (des_bucket, des_filename)),
)
return self.api_call(url)
def _stat_rm_handler(self, action, bucket, filename):
url = '%s/%s/%s' % (
RS_HOST, action, urlsafe_b64encode('%s:%s' % (bucket, filename))
)
return self.api_call(url)
class Bucket(object):
def __init__(self, cow, bucket):
self.cow = cow
self.bucket = bucket
def put(self, filename, data=None, keep_name=False, override=True):
return self.cow.put(self.bucket, filename, data=data, keep_name=keep_name, override=override)
def stat(self, filename):
return self.cow.stat(self.bucket, filename)
def delete(self, filename):
return self.cow.delete(self.bucket, filename)
def copy(self, *args):
return self.cow.copy(self._build_cp_mv_args(*args))
def move(self, *args):
return self.cow.move(self._build_cp_mv_args(*args))
def list_files(self, marker=None, limit=None, prefix=None):
return self.cow.list_files(self.bucket, marker=marker, limit=limit, prefix=prefix)
def _build_cp_mv_args(self, *args):
return [self.bucket, args[0], self.bucket, args[1]]