英文:
Download public file from Google Drive - Golang
问题
我有一个存储在Google Drive上的zip文件（它是公开共享的）。我想知道如何在Golang中下载它。这段代码只是创建一个名为"file.zip"的空文件：
package main
import (
"fmt"
"io"
"net/http"
"os"
)
func main() {
url := "https://docs.google.com/uc?export=download&id=0B2Q7X-dUtUBebElySVh1ZS1iaTQ"
fileName := "file.zip"
fmt.Println("正在下载文件...")
output, err := os.Create(fileName)
defer output.Close()
response, err := http.Get(url)
if err != nil {
fmt.Println("下载错误", url, "-", err)
return
}
defer response.Body.Close()
n, err := io.Copy(output, response.Body)
fmt.Println(n, "字节已下载")
}
希望对你有帮助！
英文:
I have a zip file stored on Google Drive (it is shared publicly). I want to know how to download it in Golang. This current code just creates a blank file named "file.zip":
package main
import (
"fmt"
"io"
"net/http"
"os"
)
func main() {
url := "https://docs.google.com/uc?export=download&id=0B2Q7X-dUtUBebElySVh1ZS1iaTQ"
fileName := "file.zip"
fmt.Println("Downloading file...")
output, err := os.Create(fileName)
defer output.Close()
response, err := http.Get(url)
if err != nil {
fmt.Println("Error while downloading", url, "-", eerrror)
return
}
defer response.Body.Close()
n, err := io.Copy(output, response.Body)
fmt.Println(n, "bytes downloaded")
}
答案1
得分: 9
这似乎是一个错误，可能是与Google Drive或golang有关，我不确定是哪个！
问题在于你提供的第一个URL会重定向到第二个URL，看起来像这样：
https://doc-00-c8-docs.googleusercontent.com/docs/securesc/ha0ro937gcuc7l7deffksulhg5h7mbp1/8i67l6m6cdojptjuh883mu0qqmtptds1/1376330400000/06448503420061938118/*/0B2Q7X-dUtUBebElySVh1ZS1iaTQ?h=16653014193614665626&e=download
请注意URL中的*，根据这个stackoverflow问题，这是合法的。然而，它在作为分隔符时具有特殊含义。
Go使用%2A对*进行编码，如下所示：
https://doc-00-c8-docs.googleusercontent.com/docs/securesc/ha0ro937gcuc7l7deffksulhg5h7mbp1/8i67l6m6cdojptjuh883mu0qqmtptds1/1376330400000/06448503420061938118/%2A/0B2Q7X-dUtUBebElySVh1ZS1iaTQ?h=16653014193614665626&e=download
而Google回复“403 Forbidden”。
Google似乎没有将%2A解析为*。
根据维基百科上的这篇文章，URI方案中使用的保留字符（其中包括*）：如果需要将该字符用于其他目的，则必须对该字符进行百分比编码。
我对此不够了解，无法说出谁是对的，但由于Google编写了问题的两个部分，肯定是他们的某个地方出了问题！
英文:
This appears to be a bug, either with Google drive or with golang, I'm not sure which!
The problem is that the first URL you gave redirects to a second URL which looks something like this
https://doc-00-c8-docs.googleusercontent.com/docs/securesc/ha0ro937gcuc7l7deffksulhg5h7mbp1/8i67l6m6cdojptjuh883mu0qqmtptds1/1376330400000/06448503420061938118/*/0B2Q7X-dUtUBebElySVh1ZS1iaTQ?h=16653014193614665626&e=download
Note the * in the URL which is legal according to this stack overflow question. However it does have a special meaning as a delimeter.
Go fetches the URL with the * encoded as %2A like this
https://doc-00-c8-docs.googleusercontent.com/docs/securesc/ha0ro937gcuc7l7deffksulhg5h7mbp1/8i67l6m6cdojptjuh883mu0qqmtptds1/1376330400000/06448503420061938118/%2A/0B2Q7X-dUtUBebElySVh1ZS1iaTQ?h=16653014193614665626&e=download
Which Google replies "403 Forbidden" to.
Google doesn't seem to be resolving the %2A into a *.
According to this article on wikipedia reserved characters (of which * is one) used in a URI scheme: if it is necessary to use that character for some other purpose, then the character must be percent-encoded.
I'm not enough of an expert on this to say who is right, but since Google wrote both parts of the problem it is definitely their fault somewhere!
答案2
得分: 6
我找到了解决方案。
使用：https://googledrive.com/host/ID
而不是：https://docs.google.com/uc?export=download&id=ID
英文:
I found the solution.
Use: https://googledrive.com/host/ID
Instead of: https://docs.google.com/uc?export=download&id=ID
答案3
得分: 3
我还在调查为什么会发生这种情况，与此同时，你可以使用这个解决方法：
http://play.golang.org/p/SzGBAiZdGJ
当发生重定向时，会调用CheckRedirect函数，你可以添加一个不透明路径来避免URL进行编码。
Francesc
英文:
I'm still investigating on why this is happening, in the meanwhile you can use this workaround:
http://play.golang.org/p/SzGBAiZdGJ
CheckRedirect is called when a redirect happens and you can add an Opaque path to avoid having the URL url-encoded.
Francesc
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