RIF Multisig SDK - Transaction listing

Required packages:

@gnosis.pm/safe-service-client (still in alpha version as June 2021), client SDK to facilitate the interaction with the Safe Transaction Service API.

Safe Transaction Service addresses
- MAINNET: TBD
- TESTNET: https://safe-transaction.testnet.rifos.org/
SafeServiceClient initialization
- Parameters
  - SAFE_TRANSACTION_SERVICE_URL: string - the address where the safe transaction service has been deployed to
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```
import SafeServiceClient from "@gnosis.pm/safe-service-client";

const safeService = new SafeServiceClient(SAFE_TRANSACTION_SERVICE_URL)
```
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Get Safe accounts by owner
- It retrieves the list of safes for which the account provided is among the owners.
- Parameters
  - ownerAddress: string - the address of the owner for which we want to retrieve the safe addresses
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```
const safesByOwner: OwnerResponse = await safeServiceClient.getSafesByOwner(
    ownerAddress
);
```
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Get the list of pending transactions
- With the list of safe addresses previously retrieved, we need to collect all the pending transactions for each safe address.
- Parameters
  - safeAddress: string - the address of the safe for which we want to retrieve the transactions
  - nonce?: number - optional, it is used to filter the transactions with nonce greater than or equal to the one specified.
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```
const pendingTransactions = await safeService.getPendingTransactions(safeAddress);
```
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It uses the following query to retrieve all transactions:
```
const PENDING_TRANSACTIONS_URL = /safes/${safeAddress}/multisig-transactions/?executed=false&nonce__gte=${nonce}`
```
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The service doesn't allow filtering transactions by confirmations, so the filter must be applied on client-side after retrieving the transactions. For checking if a transaction has been confirmed by an owner, we need to check the confirmations array field in the transactions retrieved.

Transaction format:
```
{
    "safe": "string",
    "to": "string",
    "value": "string",
    "data": "string",
    ...
    "confirmations": [
        {
            "owner": "string",
            "submissionDate": "2021-06-10T08:55:22.014Z",
            "transactionHash": "string",
            "signature": "string",
            "signatureType": "string"
        }
    ],
    "signatures": "string"
}
```
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Each confirmation has the following format:
```
{
    "owner": "string",
    "submissionDate": "2021-06-10T08:55:22.014Z",
    "transactionHash": "string",
    "signature": "string",
    "signatureType": "string"
}
```
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So to verify if a transaction is pending because of a specific owner approval, we need to check if that owner is among the ones who haven't confirmed the transaction yet. If the owner has already confirmed the transaction, it means the transaction is still pending because of other approvals (the approvals don't satisfy the threshold yet).
Get the transaction history
- With the list of safe addresses previously retrieved, we need to collect all the transactions (either pending or executed) for each safe address.
- Parameters
  - safeAddress: string - the address of the safe for which we want to retrieve the transactions
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```
const transactionHistory = await safeServiceClient.getMultisigTransactions(safeAddress)
```
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Get the list of past transactions
- As of June 2021, the safe-service-client package doesn't provide a method to retrieve all the past transactions, so we need to query the Safe Transaction Service API URL directly.
With the list of safe addresses previously retrieved, we need to collect all the past transactions for each safe address.
```
const url = `${SAFE_TRANSACTION_SERVICE_URL}/api/v1/safes/${safe}/all-transactions/?queued=false&executed=true`;
```
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So we could use the axios package to fetch data.
```
import axios from 'axios';

const axiosResponse = await axios.get(url);
const transactions = axiosResponse.data
```
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Important: Since the library is still in the alpha version, all the methods aforementioned don't allow to query transactions per page, and the default limit is set to 100.

RIF Multisig SDK - Transaction listing

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