Stable certified assets

This is a fork of Dfinity's certified assets library, but with data structures replaced with their stable memory analogs from ic-stable-memory.

This library uses SCertifiedBTreeMap data collection, which is a Merkle tree stored completely in stable memory. This allows, easier than with the original implementation, to create canisters which simultaneously serve both: certified frontend and certified backend at the same time.

This is a reference implementation. Tests pass and it produces valid certificates on main-net, but don't use it for anything important, unless you know what you're doing.

Deployment

Directory example_project contains certified assets canister, similar to this one. This canister appears to behave exactly like it's originator, but it stores all its data in stable memory, instead of heap.

In order to try this canister yourself:

1. dfx start in a separate terminal
2. cd example_project
3. dfx deploy
4. icx-asset --pem ~/.config/dfx/identity/default/identity.pem sync <CANISTER ID> ./assets/

This last step will upload every file from example_project/assets directory into the canister. If there is a file named index.html, you can go to http://127.0.0.1:4943/?canisterId=<CANISTER ID> and see it is rendered in your browser.