public Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
// Don't process "snapshot" requests against a snapshot database
if (context.Controller is SnapshotsController)
{
return(next());
}
if (context.HttpContext.Request.Headers.TryGetValue(SnapshotIdentifierHeaderName, out StringValues values))
{
// Ensure attempts to modify the snapshot are prevented
if (!context.HttpContext.Request.Method.EqualsIgnoreCase(HttpMethod.Get.ToString()) &&
!context.HttpContext.Request.Method.EqualsIgnoreCase(HttpMethod.Options.ToString()))
{
context.Result = new SnapshotsAreReadOnlyResult();
return(Task.CompletedTask);
}
_snapshotContextProvider.SetSnapshotContext(
new SnapshotContext(values.FirstOrDefault()));
}
return(next());
}