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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using HtmlAgilityPack;
using Pathoschild.Http.Client;
using StardewModdingAPI.Toolkit;
namespace StardewModdingAPI.Web.Framework.Clients.Nexus
{
/// <summary>An HTTP client for fetching mod metadata from the Nexus website.</summary>
internal class NexusWebScrapeClient : INexusClient
{
/*********
** Properties
*********/
/// <summary>The URL for a Nexus mod page for the user, excluding the base URL, where {0} is the mod ID.</summary>
private readonly string ModUrlFormat;
/// <summary>The URL for a Nexus mod page to scrape for versions, excluding the base URL, where {0} is the mod ID.</summary>
public string ModScrapeUrlFormat { get; set; }
/// <summary>The underlying HTTP client.</summary>
private readonly IClient Client;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="userAgent">The user agent for the Nexus Mods API client.</param>
/// <param name="baseUrl">The base URL for the Nexus Mods site.</param>
/// <param name="modUrlFormat">The URL for a Nexus Mods mod page for the user, excluding the <paramref name="baseUrl"/>, where {0} is the mod ID.</param>
/// <param name="modScrapeUrlFormat">The URL for a Nexus mod page to scrape for versions, excluding the base URL, where {0} is the mod ID.</param>
public NexusWebScrapeClient(string userAgent, string baseUrl, string modUrlFormat, string modScrapeUrlFormat)
{
this.ModUrlFormat = modUrlFormat;
this.ModScrapeUrlFormat = modScrapeUrlFormat;
this.Client = new FluentClient(baseUrl).SetUserAgent(userAgent);
}
/// <summary>Get metadata about a mod.</summary>
/// <param name="id">The Nexus mod ID.</param>
/// <returns>Returns the mod info if found, else <c>null</c>.</returns>
public async Task<NexusMod> GetModAsync(uint id)
{
// fetch HTML
string html;
try
{
html = await this.Client
.GetAsync(string.Format(this.ModScrapeUrlFormat, id))
.AsString();
}
catch (ApiException ex) when (ex.Status == HttpStatusCode.NotFound)
{
return null;
}
// parse HTML
var doc = new HtmlDocument();
doc.LoadHtml(html);
// handle Nexus error message
HtmlNode node = doc.DocumentNode.SelectSingleNode("//div[contains(@class, 'site-notice')][contains(@class, 'warning')]");
if (node != null)
{
string[] errorParts = node.InnerText.Trim().Split(new[] { '\n' }, 2, System.StringSplitOptions.RemoveEmptyEntries);
string errorCode = errorParts[0];
string errorText = errorParts.Length > 1 ? errorParts[1] : null;
switch (errorCode.Trim().ToLower())
{
case "not found":
return null;
default:
return new NexusMod { Error = $"Nexus error: {errorCode} ({errorText})." };
}
}
// extract mod info
string url = this.GetModUrl(id);
string name = doc.DocumentNode.SelectSingleNode("//h1")?.InnerText.Trim();
string version = doc.DocumentNode.SelectSingleNode("//ul[contains(@class, 'stats')]//li[@class='stat-version']//div[@class='stat']")?.InnerText.Trim();
SemanticVersion.TryParse(version, out ISemanticVersion parsedVersion);
// extract file versions
List<string> rawVersions = new List<string>();
foreach (var fileSection in doc.DocumentNode.SelectNodes("//div[contains(@class, 'files-tabs')]"))
{
string sectionName = fileSection.Descendants("h2").First().InnerText;
if (sectionName != "Main files" && sectionName != "Optional files")
continue;
rawVersions.AddRange(
from statBox in fileSection.Descendants().Where(p => p.HasClass("stat-version"))
from versionStat in statBox.Descendants().Where(p => p.HasClass("stat"))
select versionStat.InnerText.Trim()
);
}
// choose latest file version
ISemanticVersion latestFileVersion = null;
foreach (string rawVersion in rawVersions)
{
if (!SemanticVersion.TryParse(rawVersion, out ISemanticVersion cur))
continue;
if (parsedVersion != null && !cur.IsNewerThan(parsedVersion))
continue;
if (latestFileVersion != null && !cur.IsNewerThan(latestFileVersion))
continue;
latestFileVersion = cur;
}
// yield info
return new NexusMod
{
Name = name,
Version = parsedVersion?.ToString() ?? version,
LatestFileVersion = latestFileVersion,
Url = url
};
}
/// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
public void Dispose()
{
this.Client?.Dispose();
}
/*********
** Private methods
*********/
/// <summary>Get the full mod page URL for a given ID.</summary>
/// <param name="id">The mod ID.</param>
private string GetModUrl(uint id)
{
UriBuilder builder = new UriBuilder(this.Client.BaseClient.BaseAddress);
builder.Path += string.Format(this.ModUrlFormat, id);
return builder.Uri.ToString();
}
}
}
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