[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/passwordTokenRequest.ts

@@ -0,0 +1,36 @@
+import { TokenRequest, TokenRequestTwoFactor } from "./tokenRequest";
+
+import { CaptchaProtectedRequest } from "../captchaProtectedRequest";
+import { DeviceRequest } from "../deviceRequest";
+
+import { Utils } from "../../../misc/utils";
+
+export class PasswordTokenRequest extends TokenRequest implements CaptchaProtectedRequest {
+  constructor(
+    public email: string,
+    public masterPasswordHash: string,
+    public captchaResponse: string,
+    protected twoFactor: TokenRequestTwoFactor,
+    device?: DeviceRequest
+  ) {
+    super(twoFactor, device);
+  }
+
+  toIdentityToken(clientId: string) {
+    const obj = super.toIdentityToken(clientId);
+
+    obj.grant_type = "password";
+    obj.username = this.email;
+    obj.password = this.masterPasswordHash;
+
+    if (this.captchaResponse != null) {
+      obj.captchaResponse = this.captchaResponse;
+    }
+
+    return obj;
+  }
+
+  alterIdentityTokenHeaders(headers: Headers) {
+    headers.set("Auth-Email", Utils.fromUtf8ToUrlB64(this.email));
+  }
+}