public static LinkHeader LinksFromHeader(string linkHeaderStr)
{
if (string.IsNullOrWhiteSpace(linkHeaderStr))
{
return(null);
}
var linkStrings = linkHeaderStr.Split(',');
if (!linkStrings.Any())
{
return(null);
}
var linkHeader = new LinkHeader();
foreach (var linkString in linkStrings)
{
var relMatch = Regex.Match(linkString, "(?<=rel=\").+?(?=\")", RegexOptions.IgnoreCase);
var linkMatch = Regex.Match(linkString, "(?<=<).+?(?=>)", RegexOptions.IgnoreCase);
if (relMatch.Success && linkMatch.Success)
{
var rel = relMatch.Value.ToUpper();
var link = linkMatch.Value;
switch (rel)
{
case "FIRST":
linkHeader.FirstLink = link;
break;
case "PREV":
linkHeader.PrevLink = link;
break;
case "NEXT":
linkHeader.NextLink = link;
break;
case "LAST":
linkHeader.LastLink = link;
break;
}
}
}
return(linkHeader);
}
/// <summary>
/// Gets list of visitors who are in segment specified by <paramref name="codename"/>.
/// </summary>
/// <param name="codename">Codename of segment.</param>
/// <returns></returns>
public async Task <List <string> > GetVisitorsInSegmentAsync(string codename)
{
if (string.IsNullOrEmpty(codename))
{
throw new ArgumentException("Codename must be set.", nameof(codename));
}
var uids = new List <string>();
var nextLink = $"{_segmentApiRoutePrefix}/{codename}/visitors";
while (nextLink != null)
{
using (var response = await _httpClient.GetAsync(nextLink))
{
nextLink = response.Headers.TryGetValues("Link", out var links) ? LinkHeader.LinksFromHeader(links.FirstOrDefault())?.NextLink : null;
var content = await DeserializeContent <VisitorsResponse>(response);
uids.AddRange(content.Visitors.Select(visitor => visitor.Uid));
}
}
return(uids);
}