Implement canAcceptVerificationRequest

Author: richvdh

src/crypto-api/verification.ts

@@ -350,3 +350,11 @@ export interface GeneratedSas {
  * English name.
  */
 export type EmojiMapping = [emoji: string, name: string];
+
+/**
+ * True if the request is in a state where it can be accepted (ie, that we're in phases {@link VerificationPhase.Unsent}
+ * or {@link VerificationPhase.Requested}, and that we're not in the process of sending a `ready` or `cancel`).
+ */
+export function canAcceptVerificationRequest(req: VerificationRequest): boolean {
+    return req.phase < VerificationPhase.Ready && !req.accepting && !req.declining;
+}

src/crypto/verification/request/VerificationRequest.ts

@@ -25,6 +25,7 @@ import { VerificationBase } from "../Base";
 import { VerificationMethod } from "../../index";
 import { TypedEventEmitter } from "../../../models/typed-event-emitter";
 import {
+    canAcceptVerificationRequest,
     VerificationPhase as Phase,
     VerificationRequest as IVerificationRequest,
     VerificationRequestEvent,
@@ -248,7 +249,7 @@ export class VerificationRequest<C extends IVerificationChannel = IVerificationC
     }
 
     public get canAccept(): boolean {
-        return this.phase < PHASE_READY && !this._accepting && !this._declining;
+        return canAcceptVerificationRequest(this);
     }
 
     public get accepting(): boolean {