Let visitors try the app as a guest, and keep their study when they log in - #990
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…og in The landing page now offers, first, to try Solid Memo without logging in. A guest studies in a pod kept in the browser: localPod.ts serves the part of the Solid Protocol the adapters use (GET, HEAD, PUT, DELETE, SPARQL DATA PATCHes, ETags and preconditions, containment listings) over a ResourceStore, IndexedDB in the browser, so the login redirect does not lose it. A router sends every URL below https://guest.solid-memo.invalid/ there and every other one to the network, so every adapter, use case and screen works for guests unchanged. The origin never resolves: a guest URL that reached the network would fail rather than go anywhere. Logged in, the user is offered to move the guest's study into their Pod: transferGuestStudy copies the guest's instance into a new instance, its IRIs moved and the guest's WebID made theirs, checks no document still names the guest's pod, validates the copy and that the guest's study did not change meanwhile, registers it in their type index, and only then deletes it from the browser. A failure before the registration removes the copy and leaves the guest's study as it was. The copy and verify steps are shared with the instance update now. @inrupt/solid-client read the WebID document for storage discovery with the browser's own fetch, whatever fetch it was given; it is now handed the profile read through the app's. The move is tested end to end against CSS 7 and 6 and NSS 6 and 5. See docs/guest-mode.md.
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