public ScrapySource(List <ScrapyRule> rules, ScrapySource source) : this(rules, source._content)
{
}
private async Task ScrapeSourceAsync(ScrapySource source)
{
var responseBody = string.Empty;
try
{
if (source.Url.StartsWith("//"))
{
source.Url = $"http:{source.Url}";
}
if (!string.IsNullOrEmpty(_options.BaseUrl) && !source.Url.StartsWith(_options.BaseUrl))
{
source.Url = $"{_options.BaseUrl}{source.Url}";
}
responseBody = await _client.GetStringAsync(source.Url);
}
catch (Exception ex)
{
_log?.Invoke($"[Url error]: {ex.Message}");
}
if (string.IsNullOrEmpty(responseBody))
{
return;
}
var parser = new HtmlParser();
var dom = parser.Parse(responseBody);
foreach (var rule in source.Rules)
{
var elements = GetElements(dom, rule);
if (elements == null || !elements.Any())
{
continue;
}
switch (rule.Type)
{
case ScrapyRuleType.Text:
source.AddContent(rule.Name, WebUtility.HtmlDecode(elements[0].TextContent).Trim());
break;
case ScrapyRuleType.Attribute:
if (string.IsNullOrEmpty(rule.Attribute))
{
continue;
}
var firstElement = elements[0];
if (firstElement.HasAttribute(rule.Attribute))
{
var attr = firstElement.Attributes[rule.Attribute];
source.AddContent(rule.Name, attr.Value);
}
break;
case ScrapyRuleType.Image:
var imgSrcs = elements.Select(x => x.Attributes["src"].Value).ToList();
var imgPaths = new List <string>();
foreach (var imgSrc in imgSrcs)
{
var fileName = await DownloadAsync(imgSrc);
if (!string.IsNullOrEmpty(fileName))
{
imgPaths.Add(fileName);
}
}
if (imgPaths.Any())
{
source.AddContent(rule.Name, string.Join("; ", imgPaths));
}
break;
case ScrapyRuleType.Source:
if (rule.Source?.Rules == null)
{
break;
}
foreach (var element in elements)
{
var url = element.Attributes["href"].Value;
if (url == null)
{
break;
}
var newSource = new ScrapySource(rule.Source.Rules, source)
{
Url = url
};
if (_sources.TryAdd(newSource))
{
_log?.Invoke($"[Source]: {url}");
}
}
break;
}
}
if (source.Rules.All(x => x.Type != ScrapyRuleType.Source))
{
var content = source.GetContent();
_dump?.Invoke(content);
_log?.Invoke($"[Dump]: {source.Url}");
}
}