Exposed a few methods to derived class to support other client (#286)

Co-authored-by: Arun George <11051042+aruniverse@users.noreply.github.com>

Author: abeesh

change/@itwin-electron-authorization-7f7c86fe-7b62-4e7d-848f-2d36792f35c6.json

@@ -0,0 +1,7 @@
+{
+  "type": "minor",
+  "comment": "Exposed a few methods to the derived class to support other clients",
+  "packageName": "@itwin/electron-authorization",
+  "email": "3654177+abeesh@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}

packages/electron/src/main/Client.ts

@@ -281,7 +281,7 @@ export class ElectronMainAuthorization implements AuthorizationClient {
     return this._accessToken;
   }
 
-  private setAccessToken(token: AccessToken) {
+  protected setAccessToken(token: AccessToken) {
     if (token === this._accessToken)
       return;
 
@@ -301,7 +301,7 @@ export class ElectronMainAuthorization implements AuthorizationClient {
   /** Loads the access token from the store, and refreshes it if necessary and possible
    * @return AccessToken if it's possible to get a valid access token, and undefined otherwise.
    */
-  private async loadAccessToken(): Promise<AccessToken> {
+  protected async loadAccessToken(): Promise<AccessToken> {
     const refreshToken = await this._refreshTokenStore.load(this._scopes);
 
     if (!refreshToken)
@@ -522,7 +522,7 @@ export class ElectronMainAuthorization implements AuthorizationClient {
       await electron.shell.openExternal(this._configuration.endSessionEndpoint);
   }
 
-  private async processTokenResponse(
+  protected async processTokenResponse(
     tokenResponse: TokenResponse,
   ): Promise<AccessToken> {
     this._refreshToken = tokenResponse.refreshToken;
@@ -540,7 +540,7 @@ export class ElectronMainAuthorization implements AuthorizationClient {
     return bearerToken;
   }
 
-  private async clearTokenCache() {
+  protected async clearTokenCache() {
     this._refreshToken = undefined;
     this._expiresAt = undefined;