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acd: Fix download of large files failing - Fixes #1501

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Previously it was necessary to work around large files failing to
download with `--acd-templink-threshold`.  This change makes that flag
obsolete and all files should download.  Templinks may be useful under
some circumstances though the flag isn't being removed.

It does this by filtering `Authorization:` headers out in the
transport if the authorization is supplied in the URL.  This prevents
the "Only one auth mechanism allowed; only the X-Amz-Algorithm query
parameter, Signature query string parameter or the Authorization
header should be specified" error from AWS.
This commit is contained in:
Nick Craig-Wood 2017-11-24 09:08:35 +00:00
parent fdb01437d8
commit 6448c445f5
1 changed files with 25 additions and 1 deletions
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26
amazonclouddrive/amazonclouddrive.go
View file

@ -174,10 +174,34 @@ func (f *Fs) shouldRetry(resp *http.Response, err error) (bool, error) {
return fs.ShouldRetry(err) || fs.ShouldRetryHTTP(resp, retryErrorCodes), err
}
// If query parameters contain X-Amz-Algorithm remove Authorization header
//
// This happens when ACD redirects to S3 for the download. The oauth
// transport puts an Authorization header in which we need to remove
// otherwise we get this message from AWS
//
// Only one auth mechanism allowed; only the X-Amz-Algorithm query
// parameter, Signature query string parameter or the Authorization
// header should be specified
func filterRequest(req *http.Request) {
if req.URL.Query().Get("X-Amz-Algorithm") != "" {
fs.Debugf(nil, "Removing Authorization: header after redirect to S3")
req.Header.Del("Authorization")
}
}
// NewFs constructs an Fs from the path, container:path
func NewFs(name, root string) (fs.Fs, error) {
root = parsePath(root)
oAuthClient, ts, err := oauthutil.NewClient(name, acdConfig)
baseClient := fs.Config.Client()
if do, ok := baseClient.Transport.(interface {
SetRequestFilter(f func(req *http.Request))
}); ok {
do.SetRequestFilter(filterRequest)
} else {
fs.Debugf(name+":", "Couldn't add request filter - large file downloads will fail")
}
oAuthClient, ts, err := oauthutil.NewClientWithBaseClient(name, acdConfig, baseClient)
if err != nil {
log.Fatalf("Failed to configure Amazon Drive: %v", err)
}