[Webkit-unassigned] [Bug 258859] New: [iOS] WKWebView doesn't prompt for additional IndexedDB quota

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258859

            Bug ID: 258859
           Summary: [iOS] WKWebView doesn't prompt for additional
                    IndexedDB quota
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Website Storage
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ajuma at chromium.org
                CC: achristensen at apple.com, beidson at apple.com,
                    cdumez at apple.com, sihui_liu at apple.com

When a webpage wants to use a large amount of storage space for IndexedDB, Safari prompts the user for permission. However, non-Safari WKWebViews are not able to do this, since this is handled by SPI on WKUIDelegate. Specifically, WKUIDelegate has `decideDatabaseQuotaForSecurityOrigin` functions declared here: https://github.com/WebKit/WebKit/blob/main/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegatePrivate.h#L133

A bug reporter on the chromium bug tracker (crbug.com/1457845) reports that in Chrome on iOS, they can use ~1 GB of storage space, but can't use any more. But on Safari, the user is prompted to allow additional storage.

WKWebView should either handle this prompting on its own, or allow the embedder to show a prompt (by promoting the `decideDatabaseQuotaForSecurityOrigin` SPI to API).

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