[Tech debt] Refactor authService and remove LogInHelper (#588)

* Use different strategy classes for different types of login
* General refactor and cleanup of auth logic
* Create subclasses for different types of login credentials
* Create subclasses for different types of tokenRequests
* Create TwoFactorService, move code out of authService
* refactor base CLI commands to use new interface

common/src/models/request/identityToken/tokenRequest.ts

@@ -0,0 +1,48 @@
+import { TwoFactorProviderType } from "../../../enums/twoFactorProviderType";
+
+import { DeviceRequest } from "../deviceRequest";
+
+export interface TokenRequestTwoFactor {
+  provider: TwoFactorProviderType;
+  token: string;
+  remember: boolean;
+}
+
+export abstract class TokenRequest {
+  protected device?: DeviceRequest;
+
+  constructor(protected twoFactor: TokenRequestTwoFactor, device?: DeviceRequest) {
+    this.device = device != null ? device : null;
+  }
+
+  alterIdentityTokenHeaders(headers: Headers) {
+    // Implemented in subclass if required
+  }
+
+  setTwoFactor(twoFactor: TokenRequestTwoFactor) {
+    this.twoFactor = twoFactor;
+  }
+
+  protected toIdentityToken(clientId: string) {
+    const obj: any = {
+      scope: "api offline_access",
+      client_id: clientId,
+    };
+
+    if (this.device) {
+      obj.deviceType = this.device.type;
+      obj.deviceIdentifier = this.device.identifier;
+      obj.deviceName = this.device.name;
+      // no push tokens for browser apps yet
+      // obj.devicePushToken = this.device.pushToken;
+    }
+
+    if (this.twoFactor.token && this.twoFactor.provider != null) {
+      obj.twoFactorToken = this.twoFactor.token;
+      obj.twoFactorProvider = this.twoFactor.provider;
+      obj.twoFactorRemember = this.twoFactor.remember ? "1" : "0";
+    }
+
+    return obj;
+  }
+}