本篇内容主要讲解“怎么向s3cmd服务上传数据”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么向s3cmd服务上传数据”吧!
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1. 基本原理
操作流程:
1.客户端向presign server提交上传操作请求，生成对应的presign URL
2.使用生成的presign URL构造HTTP请求，向S3服务上传数据。
2. 优缺点
优点:
1. accesskey和secretkey不会存储在客户端，避免key泄露
2. 每个presignURL对应一个keyname，在有效时间内可以任意上传和覆盖已有文件，比较灵活。
3. 服务端可以结合各种Auth系统完成客户端的认证和授权，方便集成现有业务。
4. 客户端上传下载方式灵活，拿到presignURL以后，可以通过任意支持HTTP协议的客户端进行上传下载操作。
缺点:
1. 上传和下载的交互比普通上传要多出一个步骤。
2. 文中的presign是以单次PUT方式上传，大文件不适用这个方法。
3.具体实现
安装服务端依赖
pip install boto
pip install flask-restful
服务端demo代码如下：
# -*- coding: utf-8 -*-
import boto
import boto.s3.connection
from flask import Flask, request
from flask_restful import Resource, Api
import re
s3enpoint = 's3.ceph.work' #S3服务的endpoint
access_key = '' #access_key
secret_key = '' #secret_key
bucket = 'multi-upload' #上传数据存放的bucket名称
class Presign_Upload(Resource):
def __init__(self):
self.s3enpoint = s3enpoint
self.access_key = access_key
self.secret_key = secret_key
self.bucket = bucket
# super(Presign_Upload,self).__init__()
self.headers = {}
def presign(self,key_name,expires_in):
conn = boto.connect_s3(
aws_access_key_id = self.access_key,
aws_secret_access_key = self.secret_key,
host = self.s3enpoint,
port = 80 ,
is_secure = False, # uncommmnt if you are not using ssl
# calling_format = boto.s3.connection.OrdinaryCallingFormat(), #use path-style
calling_format = boto.s3.connection.SubdomainCallingFormat(), #use virtual-hosted-style
)
presigened_url = conn.generate_url(expires_in, "PUT", self.bucket, key_name,headers=self.headers)
return presigened_url
def get(self):
if not request.args.get("keyname"):
return "no keyname", 404
else:
keyname = request.args.get("keyname")
if not request.args.get("expires"):
return "no expires", 404
else:
expires = int(request.args.get("expires"))
if request.args.get("contentype"):
contentype = request.args.get("contentype")
self.headers['Content-Type'] = contentype
if request.args.get("policy"):
policy = request.args.get("policy")
self.headers['x-amz-acl'] = policy
meatadata_rule = 'x-amz-meta-'
for parm in request.args:
if re.match(meatadata_rule, parm):
self.headers[parm] = request.args.get(parm)
return {"PresignURL": self.presign(keyname, expires)}
class Presign_Download(Resource):
def __init__(self):
Resource.__init__(self)
self.s3enpoint = s3enpoint
self.access_key = access_key
self.secret_key = secret_key
self.bucket = bucket
self.headers = {}
def presign(self,key_name,expires_in):
conn = boto.connect_s3(
aws_access_key_id = self.access_key,
aws_secret_access_key = self.secret_key,
host = self.s3enpoint,
port = 80 ,
is_secure = False, # uncommmnt if you are not using ssl
# calling_format = boto.s3.connection.OrdinaryCallingFormat(), #use path-style
calling_format = boto.s3.connection.SubdomainCallingFormat(), #use virtual-hosted-style
)
presigened_url = conn.generate_url(expires_in, "GET", self.bucket, key_name)
return presigened_url
def get(self):
if not request.args.get("keyname"):
return "no keyname", 400
else:
keyname = request.args.get("keyname")
if not request.args.get("expires"):
return "no expires", 400
else:
expires = int(request.args.get("expires"))
return {"PresignURL": self.presign(keyname, expires)}
app = Flask(__name__)
api = Api(app)
api.add_resource(Presign_Upload, '/upload')
api.add_resource(Presign_Download, '/download')
if __name__ == '__main__':
app.run(debug=True)安装客户端依赖
pip install requests
客户端demo代码如下：
# -*- coding: utf-8 -*-
import requests
import json
class Presign_client():
def __init__(self, server_url):
self.server_url = server_url
self.headers = {}
def get_upload_presignURL(self, keyname, expires, policy=None, contentype=None, metadata=None):
base_url_ = "{server_url}/upload?keyname={keyname}&expires={expires}".format(server_url=server_url,keyname=keyname,expires=expires)
if contentype:
self.headers['Content-Type'] = contentype
base_url_ = "{base_url_}&contentype={contentype}".format(base_url_=base_url_,contentype=contentype)
if policy:
self.headers['x-amz-acl'] = policy
base_url_ = "{base_url_}&policy={policy}".format(base_url_=base_url_,policy=policy)
if metadata:
for k in metadata:
metadata_key = k
metadata_value = metadata[k]
self.headers[metadata_key] = str(metadata_value)
base_url_ = "{base_url_}&{metadata_key}={metadata_value}".format(base_url_=base_url_,metadata_key=str(metadata_key),metadata_value=metadata_value)
res = requests.get(base_url_)
return json.loads(res.content)['PresignURL']
def upload_file(self,SignURL,filepath):
with open(filepath) as fh:
mydata = fh.read()
response = requests.put(SignURL,data=mydata,headers=self.headers)
if response.status_code == 200:
print "Upload {} Successful!".format(filepath)
else:
print "Failed! status_code={}".format(response.status_code)
def get_download_presignURL(self, keyname, expires):
base_url_ = "{server_url}/download?keyname={keyname}&expires={expires}".format(server_url=server_url,keyname=keyname,expires=expires)
response = requests.get(base_url_)
return json.loads(response.content)['PresignURL']
def download_file(self,SignURL,filepath):
response = requests.get(SignURL)
if response.status_code == 200:
with open(filepath,'wb') as fh:
fh.write(response.content)
print "Download {} Successful!".format(filepath)
else:
print "Failed! status_code={}".format(response.status_code)
server_url = 'http://localhost:5000' #填服务端地址
metadata ={'x-amz-meta-abc':333,'x-amz-meta-key':'value'} #上传文件的自定义metadata
contentype = 'abc/pdf' #设置上传文件的Content-Type
policy = 'public-read' #设置上传文件的ACL
expires = 300 #设置presignURL有效时长,单位秒
file_path = '/Users/demouser/Downloads/1.pdf' #上传文件路径
save_path = '/tmp/download.pdf' #下载文件存储路径
keyname = 'upload.pdf' #上传文件的名称,对应object的keyname
client = Presign_client(server_url)
#生成上传presignURL,并上传文件
Upload_SignURL = client.get_upload_presignURL(keyname=keyname, expires=expires, policy=policy, contentype=contentype, metadata=metadata)
client.upload_file(Upload_SignURL,file_path)
#下载presignURL,并下载文件
Download_SignURL = client.get_download_presignURL(keyname=keyname, expires=expires)
client.download_file(Download_SignURL,save_path)到此，相信大家对“怎么向s3cmd服务上传数据”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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