[NayNay] Exposing substrate (#435)

<!-- Provide a brief description of the changes made in this PR -->

## Related Issue(s)
<!-- Link to the issue(s) that this PR addresses -->

- Resolves #427 

## Proposed Changes
<!-- List the changes made in this PR -->

- added new utility method to create substrate api instance, without
needing to create an entropy instance

## Testing
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- [ ] Unit tests added/updated
- [ ] Integration tests added/updated
- [ ] Manual testing performed

## Screenshots (if applicable)
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## Additional Context
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reviewer -->

## Checklist
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- [ ] I have performed a self-review of my code.
- [ ] I have commented my code.
- [ ] I have updated documentation, where necessary.

CHANGELOG.md

@@ -13,6 +13,7 @@ Version header format: `[version] Name - year-month-day (entropy-core compatibil
 ## [UNRELEASED]
 
 ### Added
+- utility method to return substrate api instance to interact with without needing to instantiate entropy instance (#435)[https://github.com/entropyxyz/sdk/pull/435]
 
 ### Fixed
 

src/index.ts

@@ -1,6 +1,6 @@
-import { ApiPromise, WsProvider } from '@polkadot/api'
+import { ApiPromise } from '@polkadot/api'
 import xtend from 'xtend'
-import { isValidSubstrateAddress as isDeployer } from './utils'
+import { createSubstrate, isValidSubstrateAddress as isDeployer } from './utils'
 import RegistrationManager, { RegistrationParams } from './registration'
 import SignatureRequestManager, { SigOps, SigWithAdaptersOps } from './signing'
 import { crypto, loadCryptoLib } from './utils/crypto'
@@ -96,8 +96,7 @@ export default class Entropy {
 
   async #init (opts: EntropyOpts) {
     this.keyring = opts.keyring
-    const wsProvider = new WsProvider(opts.endpoint)
-    this.substrate = new ApiPromise({ provider: wsProvider, noInitWarn: true })
+    this.substrate = createSubstrate(opts.endpoint)
     await this.substrate.isReadyOrError // throws an error if fails
 
     this.registrationManager = new RegistrationManager({

src/utils/index.ts

@@ -1,3 +1,4 @@
+import { WsProvider, ApiPromise } from '@polkadot/api'
 import { decodeAddress, encodeAddress } from '@polkadot/keyring'
 import { hexToU8a, isHex } from '@polkadot/util'
 import Debug from 'debug'
@@ -112,7 +113,17 @@ export async function sendHttpPost (url: string, data: any): Promise<any> {
   return oks
 }
 
+/**
+ * Creates substrate api provider without needing to instantiate an entropy instance
+ * 
+ * @param {string} endpoint - Endpoint for the api
+ * @returns {ApiPromise} Api tool to interact with protocol
+ */
 
+export function createSubstrate (endpoint: string): ApiPromise {
+  const wsProvider = new WsProvider(endpoint)
+  return new ApiPromise({ provider: wsProvider, noInitWarn: true })
+}
 
 /**
  * Converts an ArrayBuffer to a hexadecimal string.