public ForumItem(ForumItemType type, string id, string link, string updated)
{
Type = type;
Id = id;
Link = link;
Updated = updated;
}
async Task <ForumItem> CheckItemIsUpdated(ForumItemType type, HtmlNode htmlItem)
{
var link = GetHtmlValue(htmlItem, Configuration.GetSection($"{type}s:Link"));
var updated = GetHtmlValue(htmlItem, Configuration.GetSection($"{type}s:Updated"));
var idUrlPattern = IdUrlPattern[type];
var idIdPattern = IdIdPattern[type];
var idString = (idUrlPattern != null ? idUrlPattern.Match(link) : idIdPattern.Match(htmlItem.Attributes["id"].Value))?.Groups?[1]?.Value;
if (idString == null)
{
throw new InvalidDataException($"Cannot find ID for {type}");
}
if (!int.TryParse(idString, out var id))
{
throw new InvalidDataException($"Cannot parse ID for {type}");
}
var uniqueId = $"{Configuration.Key}/{id}";
var lastUpdated = await Storage.ExecuteScalarAsync($"SELECT Updated FROM {type}s WHERE {type}Id = @Param0", uniqueId) as string;
if (updated == lastUpdated)
{
return(null);
}
switch (type)
{
case ForumItemType.Forum:
case ForumItemType.Topic:
return(new ForumItem(type, uniqueId, link, updated));
case ForumItemType.Post:
return(new ForumPostItem(
GetHtmlValue(htmlItem.OwnerDocument.DocumentNode, Configuration.GetSection("Posts:ForumName")),
GetHtmlValue(htmlItem.OwnerDocument.DocumentNode, Configuration.GetSection("Posts:TopicName")),
uniqueId,
GetHtmlValue(htmlItem, Configuration.GetSection("Posts:Link")),
GetHtmlValue <int>(htmlItem, Configuration.GetSection("Posts:Index")),
GetHtmlValue(htmlItem, Configuration.GetSection("Posts:ReplyLink")),
GetHtmlValue <DateTimeOffset>(htmlItem, Configuration.GetSection("Posts:Date")),
GetHtmlValue(htmlItem, Configuration.GetSection("Posts:Author")),
GetHtmlValue <HtmlNode>(htmlItem, Configuration.GetSection("Posts:Body"))
));
default:
throw new InvalidDataException($"Unknown type {type} in CheckItemIsUpdated");
}
}
