DDO Index: Isolated node

[alexcos20]

In order to implement the concept of isolated node, we need some restrictions on what assets are indexed. We already have validators, but we need to add a list of publishers as well.

To do:

• add AUTHORIZED_PUBLISHERS env variable
• add AUTHORIZED_PUBLISHERS _LIST env variable

When indexing a new asset, if any of those envs is defined, check the publisher address and index only if it's a match (either on AUTHORIZED_PUBLISHERS , or in AUTHORIZED_PUBLISHERS_LIST with a matching chainId)

• AUTHORIZED_PUBLISHERS : List of address of accounts Example: "["0x967da4048cD07aB37855c090aAF366e4ce1b9F48","0x388C818CA8B9251b393131C08a736A67ccB19297"]"

• AUTHORIZED_PUBLISHERS_LIST looks like

{
 "1": ["0x123","0x124"],
 "2": ["0x345"]
}

(Which means: If an asset is published on chainId 1, then see if the publisher is on the accessList contract 0x123 or 0x124