我正在尝试通过R.中的the REST API使用Azure存储。我正在使用覆盖Curl的包httr。
您可以使用R-fiddle：http://www.r-fiddle.org/#/fiddle?id=vh8uqGmM
library(httr)
requestdate<-format(Sys.time(),"%a, %d %b %Y %H:%M:%S GMT")
url<-"https://preconstuff.blob.core.windows.net/pings?restype=container&comp=list"
sak<-"Q8HvUVJLBJK+wkrIEG6LlsfFo19iDjneTwJxX/KXSnUCtTjgyyhYnH/5azeqa1bluGD94EcPcSRyBy2W2A/fHQ=="
signaturestring<-paste0("GET",paste(rep("\n",12),collapse=""),
"x-ms-date:",requestdate,"
x-ms-version:2009-09-19
/preconstuff/pings
comp:list
restype:container")
headerstuff<-add_headers(Authorization=paste0("SharedKey preconstuff:",
RCurl::base64(digest::hmac(key=sak,
object=enc2utf8(signaturestring),
algo= "sha256"))),
`x-ms-date`=requestdate,
`x-ms-version`= "2009-09-19")
尝试列出blob：
content(GET(url,config = headerstuff, verbose() ))
在HTTP请求中找到的MAC签名＆＃39; Q8HvUVJLBJK + wkrIEG6LlsfFo19iDjneTwJxX / KXSnUCtTjgyyhYnH / 5azeqa1bluGD94EcPcSRyBy2W2A / fHQ ==＆＃39;与任何计算签名不同。
[1] "<?xml version=\"1.0\" encoding=\"utf-8\"?><Error>
<Code>AuthenticationFailed</Code><Message>Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.\nRequestId:1ab26da5-0001-00dc-6ddb-15e35c000000\nTime:2015-03-26T17:51:42.7190620Z</Message>
<AuthenticationErrorDetail>The MAC signature found in the HTTP request 'NTM1ODZjMjhhZmMyZGM3NDM0YTFjZDgwNGE0ODVmMzVjNDhkNjBkNzk1ZjNkZjJjOTNlNjUxYTMwMjRhNzNlYw==' is not the same as any computed signature. Server used following string to sign:
'GET\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Thu, 26 Mar 2015 17:52:37 GMT\nx-ms-version:2009-09-19\n/preconstuff/pings\ncomp:list\nrestype:container'.
</AuthenticationErrorDetail></Error>"
-> GET /pings?restype=container&comp=list HTTP/1.1
-> User-Agent: curl/7.39.0 Rcurl/1.95.4.5 httr/0.6.1
-> Host: preconstuff.blob.core.windows.net
-> Accept-Encoding: gzip
-> Accept: application/json, text/xml, application/xml, */*
-> Authorization: SharedKey preconstuff:OTRhNTgzYmY3OTY3M2UzNjk3ODdjMzk3OWM3ZmU0OTA4MWU5NTE2OGYyZGU3YzRjNjQ1M2NkNzY0ZTcyZDRhYQ==
-> x-ms-date: Thu, 26 Mar 2015 17:56:27 GMT
-> x-ms-version: 2009-09-19
->
<- HTTP/1.1 403 Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
<- Content-Length: 719
<- Content-Type: application/xml
<- Server: Microsoft-HTTPAPI/2.0
<- x-ms-request-id: 3d47770c-0001-0085-2313-6d466f000000
<- Date: Thu, 26 Mar 2015 17:56:27 GMT
<-
谷歌搜索这个问题似乎并没有产生一致的原因，但这可能是由于我的格式化/请求结构不好造成的。为此我检查了：
encoding="Base64"中headerstuff进一步添加MSDN forum question，但返回了相同的错误消息sak）作为加密密钥）转换为signaturestring的UTF8版本作为在SharedKey授权中使用的值。有什么明显的错误吗？还有其他事情要检查吗？代码是否适用于其他人？
答案 0 :(得分：4)
看起来您的问题与密钥有关。您提供的密钥字符串实际上是base64编码的。在使用原始向量对签名请求进行签名之前，需要将其解码。例如：
url<-"https://preconstuff.blob.core.windows.net/pings?restype=container&comp=list"
sak<-"Q8HvUVJLBJK+wkrIEG6LlsfFo19iDjneTwJxX/KXSnUCtTjgyyhYnH/5azeqa1bluGD94EcPcSRyBy2W2A/fHQ=="
requestdate<-format(Sys.time(),"%a, %d %b %Y %H:%M:%S %Z", tz="GMT")
signaturestring<-paste0("GET",paste(rep("\n",12),collapse=""),
"x-ms-date:",requestdate,"
x-ms-version:2009-09-19
/preconstuff/pings
comp:list
restype:container")
headerstuff<-add_headers(Authorization=paste0("SharedKey preconstuff:",
RCurl::base64(digest::hmac(key=RCurl::base64Decode(sak, mode="raw"),
object=enc2utf8(signaturestring),
algo= "sha256", raw=TRUE))),
`x-ms-date`=requestdate,
`x-ms-version`= "2009-09-19")
content(GET(url,config = headerstuff, verbose() ))
虽然没有列出blob，但这种方式不再存在身份验证错误。也许这是一个不同的问题。
此外，我将创建日期/时间的方式更改为更安全＆＃34;将当地时间更改为GMT。
答案 1 :(得分：2)
您似乎直接在授权标头中使用了您帐户的密钥。要对请求进行身份验证，您必须使用发出请求的帐户的密钥对请求进行签名，并将该签名作为请求的一部分传递。有关如何构建授权标头的详细信息，请参阅Authentication for the Azure Storage Services。
请注意，该服务在错误响应中返回StringToSign。那么，你的代码应该做的是将以下公式应用于StringToSign =“GET \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n \ n-nx-ms-date：Wed， 2015年3月25日22:24:12 GMT \ nx-ms-version：2014-02-14 \ n / preconstuff / pings \ ncomp：list \ nrestype：container“（不含引号）：
Signature=Base64(HMAC-SHA256(AccountKey, UTF8(StringToSign)))
服务如何计算StringToSign将在上面分享的链接中详细解释。
答案 2 :(得分：1)
通过MrFlick上面的示例代码工作，为了让它工作，我不得不改变一些事情。
日期字符串必须在英语区域设置中设置，例如：
lct <- Sys.getlocale("LC_TIME")
Sys.setlocale("LC_TIME", "us")
requestdate <- format(Sys.time(),"%a, %d %b %Y %H:%M:%S %Z", tz="GMT")
Sys.setlocale("LC_TIME", lct)
＆＃39;签名字符串＆＃39;应该在参数之间用\ n格式化：
signaturestring <- paste0("GET", paste(rep("\n", 12), collapse=""),
"x-ms-date:", requestdate,
"\nx-ms-version:2009-09-19\n/preconstuff/pings\ncomp:list\nrestype:container")
编辑：以下程序适合我。基于Steph Locke的例子。
library(httr)
library(RCurl)
azureBlobCall <- function(url, verb, key, requestBody=NULL, headers=NULL, ifMatch="", md5="") {
urlcomponents <- httr::parse_url(url)
account <- gsub(".blob.core.windows.net", "", urlcomponents$hostname, fixed = TRUE)
container <- urlcomponents$path
# get timestamp in us locale
lct <- Sys.getlocale("LC_TIME"); Sys.setlocale("LC_TIME", "us")
`x-ms-date` <- format(Sys.time(),"%a, %d %b %Y %H:%M:%S %Z", tz="GMT")
Sys.setlocale("LC_TIME", lct)
# if requestBody exist get content length in bytes and content type
`Content-Length` <- ""; `Content-Type` <- ""
if(!is.null(requestBody)) {
if(class(requestBody) == "form_file") {
`Content-Length` <- (file.info(requestBody$path))$size
`Content-Type` <- requestBody$type
} else {
requestBody <- enc2utf8(as.character(requestBody))
`Content-Length` <- nchar(requestBody, "bytes")
`Content-Type` <- "text/plain; charset=UTF-8"
}
}
# combine timestamp and version headers with any input headers, order and create the CanonicalizedHeaders
headers <- setNames(c(`x-ms-date`, "2015-04-05", unlist(headers)),
c("x-ms-date", "x-ms-version", unclass(names(unlist(headers)))))
headers <- headers[order(names(headers))]
CanonicalizedHeaders <- paste(names(headers), headers, sep=":", collapse = "\n")
# create CanonicalizedResource headers and add any queries to it
if(!is.null(urlcomponents$query)) {
components <- setNames(unlist(urlcomponents$query), unclass(names(unlist(urlcomponents$query))))
componentstring <- paste0("\n", paste(names(components[order(names(components))]),
components[order(names(components))], sep=":", collapse = "\n"))
} else componentstring <- ""
CanonicalizedResource <- paste0("/",account,"/",container, componentstring)
# create the authorizationtoken
signaturestring <- paste0(verb, "\n\n\n", `Content-Length`, "\n", md5, "\n", `Content-Type`, "\n\n\n",
ifMatch, "\n\n\n\n", CanonicalizedHeaders, "\n", CanonicalizedResource)
requestspecificencodedkey <- RCurl::base64(
digest::hmac(key=RCurl::base64Decode(key, mode="raw"),
object=enc2utf8(signaturestring),
algo= "sha256", raw=TRUE)
)
authorizationtoken <- paste0("SharedKey ", account, ":", requestspecificencodedkey)
# make the call
headers_final <- add_headers(Authorization=authorizationtoken, headers, `Content-Type` = `Content-Type`)
call <- httr::VERB(verb=verb, url=url, config=headers_final, body=requestBody, verbose())
print("signaturestring");print(signaturestring);
print(headers_final); print(call)
return(content(call))
}
## Tests. Replace 'key' and 'accountName' with yours
key <- "YowThr***********RDw=="
# Creates a container named 'test'
azureBlobCall("https://accountName.blob.core.windows.net/test?restype=container", "PUT", key)
# Creates a blob named 'blob' under container 'test' with the content of "Hej världen!"
azureBlobCall("https://accountName.blob.core.windows.net/test/blob", "PUT", key,
headers = c("x-ms-blob-type"="BlockBlob"), requestBody = "Hej världen!") #upload_file("blob.txt"))
# List all blob in the container 'test'
azureBlobCall("https://accountName.blob.core.windows.net/test?comp=list&restype=container", "GET", key)
# deletes the blobl named 'blob'
azureBlobCall("https://accountName.blob.core.windows.net/test/blob", "DELETE", key)
# Creates a blob named 'blob' under container 'test' with and upload the file 'blob.txt'
azureBlobCall("https://accountName.blob.core.windows.net/test/blob", "PUT", key,
headers = c("x-ms-blob-type"="BlockBlob"), requestBody = upload_file("blob.txt"))
# deletes the container named 'test'
azureBlobCall("https://accountName.blob.core.windows.net/test?restype=container", "DELETE", key)