protected static bool VerifyHeaders(HttpHeaders headers, out Uri hubLocation)
{
IEnumerable <string> headerValues;
if (!headers.TryGetValues("link", out headerValues))
{
hubLocation = null;
return(false);
}
var valueList = headerValues.ToList();
var linkHeaders = new List <LinkHeader>();
foreach (var value in valueList)
{
linkHeaders.AddRange(LinkHeader.Parse(value));
}
if (HasRequiredHeaders(linkHeaders))
{
var hub = linkHeaders.First(h => h.Relationship.Equals("hub", StringComparison.OrdinalIgnoreCase));
hubLocation = hub.Link;
return(true);
}
hubLocation = null;
return(false);
}
public void It_can_serialize_round_trip()
{
const string input =
"</v2/colors?page=117&page_size=5>; rel=previous, </v2/colors?page=119&page_size=5>; rel=next, </v2/colors?page=118&page_size=5>; rel=self, </v2/colors?page=0&page_size=5>; rel=first, </v2/colors?page=119&page_size=5>; rel=last";
var sut = LinkHeader.Parse(input);
var actual = sut.ToString();
Assert.Equal(input, actual);
}
public void parse_no_links_exist_return_null_page_links()
{
var rsp = new HttpResponseMessage();
var sut = new LinkHeader();
var result = sut.Parse(rsp.Headers);
Assert.Null(result.FirstPage);
Assert.Null(result.PreviousPage);
Assert.Null(result.NextPage);
Assert.Null(result.LastPage);
}
public void It_can_parse_link_headers()
{
const string input =
"</v2/colors?page=117&page_size=5>; rel=previous, </v2/colors?page=119&page_size=5>; rel=next, </v2/colors?page=118&page_size=5>; rel=self, </v2/colors?page=0&page_size=5>; rel=first, </v2/colors?page=119&page_size=5>; rel=last";
var actual = LinkHeader.Parse(input);
Assert.Collection(
actual.Links,
next => LinkFact.IsLink(next, "previous", "/v2/colors?page=117&page_size=5"),
next => LinkFact.IsLink(next, "next", "/v2/colors?page=119&page_size=5"),
next => LinkFact.IsLink(next, "self", "/v2/colors?page=118&page_size=5"),
next => LinkFact.IsLink(next, "first", "/v2/colors?page=0&page_size=5"),
next => LinkFact.IsLink(next, "last", "/v2/colors?page=119&page_size=5")
);
}
public void parse_link_header_format_changed_return_null_page_links()
{
var linkHeader = $"{_first},{_prev}";
var rsp = new HttpResponseMessage();
rsp.Headers.Add("link", new List <string> {
linkHeader, linkHeader
});
var sut = new LinkHeader();
var result = sut.Parse(rsp.Headers);
Assert.Null(result.FirstPage);
Assert.Null(result.PreviousPage);
Assert.Null(result.NextPage);
Assert.Null(result.LastPage);
}
public void parse_last_page_contains_first_and_previous_links_parse_out_correctly()
{
var linkHeader = $"{_first},{_prev}";
var rsp = new HttpResponseMessage();
rsp.Headers.Add("link", new List <string> {
linkHeader
});
var sut = new LinkHeader();
var result = sut.Parse(rsp.Headers);
Assert.Equal(_firstUrl, result.FirstPage);
Assert.Equal(_prevUrl, result.PreviousPage);
Assert.Null(result.NextPage);
Assert.Null(result.LastPage);
}
public void parse_url_delimiter_changed_return_null_page_links()
{
var linkHeader = $"{_first.Replace(';', ':')}";
var rsp = new HttpResponseMessage();
rsp.Headers.Add("link", new List <string> {
linkHeader, linkHeader
});
var sut = new LinkHeader();
var result = sut.Parse(rsp.Headers);
Assert.Null(result.FirstPage);
Assert.Null(result.PreviousPage);
Assert.Null(result.NextPage);
Assert.Null(result.LastPage);
}