Migrate Identity

[codabrink]

Proto: xmtp/proto#245

Migrate Identity

In our old identity system in libxmtp, String was assumed to be an ethereum address and Vec<u8> was assumed to be an installation key. This posed a few issues - for example sanitizing addresses was difficult since there was no "entry point" for addresses as they were just strings, it limited extensibility to other chains, and prevented us from implementing behaviors nicely on certain identities.

To fix this, each identity type is now wrapped in a struct. Before, a simple String that represented an ethereum address is now Ethereum(String), but you'll rarely find yourself dealing with the Ethereum struct directly. Instead - there is one new enum along-side the previously existing enum MemberIdentifier: PublicIdentifier

• MemberIdentifier (libXmtp only)
  • Represents all identifiers
    • InstallationKey
    • Ethereum
    • Passkey
    • Solana
• Identifier (libXmtp and FFI)
  • All identifiers except for the installation keys
    • Ethereum
    • Passkey
    • Solana

flowchart TD
    subgraph MemberIdentifier["MemberIdentifier"]
        Installation
        subgraph Identifier["Identifier"]
            Ethereum
            Passkeys
            Solana
            Sui
        end
    end
    
    classDef identifierStyle fill:#f6ffed,stroke:#52c41a
    classDef memberStyle fill:#fff7e6,stroke:#fa8c16
    
    class Identifier identifierStyle
    class MemberIdentifier memberStyle

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This PR does not include P256 signature validation and only focuses on the identity migration. That is coming in a fast follow.