[Webkit-unassigned] [Bug 173548] New: Selecting iCloud file via HTML file input are not complete

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173548

            Bug ID: 173548
           Summary: Selecting iCloud file via HTML file input are not
                    complete
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10.3
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dev at hirehive.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

On iOS 10.3 we started seeing hundreds of issues of empty files being uploaded.
All the issues had a the same header which lead us to Safari on iOS 10.3
User-Agent : Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/602.1

Files were sent to the server with a Content length of 0.

To replicate:
Go to icloud.com on a desktop
Create/Upload a file
Go to https://jsfiddle.net/xj39hdpx/show/ and upload file via iCloud

Result:
Textarea will show onerror was called
File type will be empty
File size will be a fraction of actual size

Demo link:
https://jsfiddle.net/xj39hdpx/show/

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