feat(nft): db implementation (wasm target)

[laruh]

#900

• IndexedDb support

• db tests

• handle the ipfs moralis links with bafy hash:
  check_moralis_ipfs_bafy function. it checks for ipfs moralis links whose hash starts with bafy. If it does, then we need to use a different gateway (e.g. ipfs.io) to handle those links. If token_uri, image or animation_url contain such link, then we change it to https://ipfs.io/ipfs/ (related to)
  

• get UriMeta from token_uri and from metadata:
  get_uri_meta function. it tries to get uri meta from token_uri, then tries to get uri meta from metadata field, then merges it into uri meta from token_uri. As a result it is more likely that image link will be not null. We use the resulting UriMeta for both NFT and history (related to)

• protect_from_spam feature.
  If protect_from_spam param is true in get_nft_list, get_nft_metadata, get_nft_transfers reqs, then we will search urls in fields like collection_name, token_name, symbol. if they have it, then the text in these parameters will be replaced by URL redacted for user protection, and possible_spam in Nft or NftTransferHistory structures will be true

Dependencies added

regex = "1" in mm2src/coins/Cargo.toml

[onur-ozkan]

if user already has this erc721 token in db, its impossible to get one more incidental erc721 token, its an error.

Can you clarify this problem? Is it fixed? What's the actual problem behind it, primary key conflicts?

[laruh]

if user already has this erc721 token in db, its impossible to get one more incidental erc721 token, its an error.

Can you clarify this problem? Is it fixed? What's the actual problem behind it, primary key conflicts?

Its not the problem, I just added the case when user sends erc721 token to themself in handle_receive_erc721.
You can check tx_hash: 0x0087e763a5b7fc61e906341f70e06e7881862cb71bc42d32e2d7485e56bcbc63 here.
For this I also needed to add a check if the sender's address doesnt match the user's address, when the user already has such erc721 token. In theory it is impossible to get two identical erc721 tokens. The exception is when you send 721 NFT to yourself, in that case it simply changes the block height.

[shamardy]

@ozkanonur @borngraced do you have any more comments/reviews regarding this PR? If not, I guess I can merge it.

[borngraced]

LGTM 🔥

[onur-ozkan]

Thanks for the previous fixes.

Some more notes and questions from my side

[onur-ozkan]

I see this block is duplicated frequently, implementing From trait on this would be useful

[laruh]

done

[onur-ozkan]

LGTM