chore: sessions dx

[joepegler]

Improved dx around creating and using a session. See here for an example

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PR-Codex overview

This PR focuses on improving session management and smart account functionalities.

Detailed summary

• Added session storage options for better session management
• Enhanced ERC20 session validation module
• Updated error messages for clarity
• Improved smart account ownership transfer handling

The following files were skipped due to too many changes: src/modules/interfaces/ISessionStorage.ts, src/account/utils/Logger.ts, examples/SEND_SOME_ETH_WITH_SPONSORSHIP.md, src/modules/session-storage/utils.ts, src/modules/utils/Constants.ts, src/modules/utils/Types.ts, examples/SEND_A_MULTI_TX_AND_PAY_GAS_WITH_TOKEN.md, examples/INITIALISE_A_SMART_CONTRACT.md, src/account/BiconomySmartAccountV2.ts, src/modules/utils/Helper.ts, src/modules/session-storage/SessionFileStorage.ts, examples/CREATE_AND_USE_A_SESSION.md, src/modules/session-storage/SessionMemoryStorage.ts, examples/CREATE_AND_USE_A_BATCH_SESSION.md, src/modules/session-storage/SessionLocalStorage.ts, src/modules/sessions/sessionSmartAccountClient.ts, README.md, tests/modules/read.test.ts, src/modules/sessions/batch.ts, src/modules/sessions/abi.ts, tests/modules/write.test.ts

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[github-actions]

size-limit report 📦

Path	Size
core (esm)	53.68 KB (+2.6% 🔺)
core (cjs)	58.61 KB (+2.96% 🔺)
account (tree-shaking)	51.85 KB (+1.09% 🔺)
bundler (tree-shaking)	2.37 KB (+1.51% 🔺)
paymaster (tree-shaking)	2.29 KB (+0.95% 🔺)
modules (tree-shaking)	40.48 KB (+1.07% 🔺)

[VGabriel45]

Is there a situation where passed smartAccount and sessionKeyAddress arguments would be different then the ones calculate above ? If not, we could improve this even more by removing the need to pass smartAccount and sessionKeyAddress in the "createSession" method. You could bind the method to the smartAccount like await smartAccount.createSession([{contractAddress: "0x...", functionSelector: "safeMint(address)", rules: ....}], sessionStorageClient, {paymasterServiceData ...})

[joepegler]

This was for a technical reason, at some point soon I want to move sessions into it's own repo because it imports merkletree. If I add the 'createSession' method to the smartAccount then the session code would need to live in the accounts package permanently, like paymaster and bundler etc. Keeping this setup will facilitate the future removal of the relatively large sessions package from our accounts package.

[livingrockrises]

this is specific to creating a session struct using ABI svm?

[livingrockrises]

and it will also send tx on-chain to set session using current active validation module(default ecdsa) ?

[joepegler]

Yes this is for ABI svm. Just using a more accessible term. Yes it encorporates the tx to change the validation module, if required

[livingrockrises]

the userop that gets built for this only supports single tx? setting one session struct on-chain on SKM.
or calldata batch is enabled where you set multiple sessions and also get session ids back in return along with tx hash.

using via multi-chain validation module goes one step further where you can send multiple userops (each op can have multiple session enabling as part of calldata batch on particular chain) that enables several same session on multiple chains

[livingrockrises]

this will just create a new key pair? store it where?

[joepegler]

createAndStoreNewSessionKey has three arguments. The third is optional and isn't used here: ISessionStorage. If the third argument isn't used then it will pick a storage client for you by default: localStorage if in the browser and FileStorage if not

[livingrockrises]

got it and this storage client stores leaf info and by default stores pk in there as well?

[livingrockrises]

current majorly used devx i have seen from dapps and demos is
i. client creates session keypair and passes session key eoa to us. keeps pk with them but pases ethers signer object

ii. during the op you pass which session key eoa and which SVM address (or session id) useful to find a leaf and corresponding proof - for dummy sig, original sig stuff

[joepegler]

This makes sense. Passing the whole store back to the sdk doesn't make sense. I thought it would be more convenient but it's less secure. I will simplify this a bit and make the store less engrained.

[livingrockrises]

can you also add list of all new methods added and description natspecs

This is already in the PR... Is there something you've noticed that I've missed?

createMultiSession

createSession

createSessionSmartAccountClient

and the one that was missing: createAndStoreNewSessionKey

I like createSessionKeyEOA (later could become createSessionKeyEOAWithPermissions with mpc network capabilities)
such can be used later on to change the implementation and register user on silence network