Function runCanMatchGuards

packages/router/src/operators/check_guards.ts:265–287

(
  injector: EnvironmentInjector,
  route: Route,
  segments: UrlSegment[],
  urlSerializer: UrlSerializer,
  currentSnapshot: PartialMatchRouteSnapshot,
  abortSignal: AbortSignal,
)

}

export function runCanMatchGuards(
  injector: EnvironmentInjector,
  route: Route,
  segments: UrlSegment[],
  urlSerializer: UrlSerializer,
  currentSnapshot: PartialMatchRouteSnapshot,
  abortSignal: AbortSignal,
): Observable<GuardResult> {
  const canMatch = route.canMatch;
  if (!canMatch || canMatch.length === 0) return of(true);

  const canMatchObservables = canMatch.map((injectionToken) => {
    const guard = getTokenOrFunctionIdentity(injectionToken as ProviderToken<any>, injector);
    const guardVal = isCanMatch(guard)
      ? guard.canMatch(route, segments, currentSnapshot)
      : runInInjectionContext(injector, () =>
          (guard as CanMatchFn)(route, segments, currentSnapshot),
        );
    return wrapIntoObservable(guardVal).pipe(takeUntilAbort(abortSignal));
  });

  return of(canMatchObservables).pipe(prioritizedGuardValue(), redirectIfUrlTree(urlSerializer));
}