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LibWeb: Implement "Resolve a Blob URL"

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Which performs a lookup to find a blob (if any) corresponding to the
given blob URL.
This commit is contained in:
Shannon Booth
2024-05-05 19:59:18 +12:00
committed by Andrew Kaster
parent c071720430
commit ec381c122e
2 changed files with 19 additions and 0 deletions
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17
Userland/Libraries/LibWeb/FileAPI/BlobURLStore.cpp
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@@ -1,6 +1,7 @@
/*
* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
* Copyright (c) 2024, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@@ -106,4 +107,20 @@ void run_unloading_cleanup_steps(JS::NonnullGCPtr<DOM::Document> document)
});
}
// https://w3c.github.io/FileAPI/#blob-url-resolve
Optional<BlobURLEntry> resolve_a_blob_url(URL::URL const& url)
{
// 1. Assert: url’s scheme is "blob".
VERIFY(url.scheme() == "blob"sv);
// 2. Let store be the user agent’s blob URL store.
auto& store = blob_url_store();
// 3. Let url string be the result of serializing url with the exclude fragment flag set.
auto url_string = MUST(String::from_byte_string(url.serialize(URL::ExcludeFragment::Yes)));
// 4. If store[url string] exists, return store[url string]; otherwise return failure.
return store.get(url_string);
}
}