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using System;
using System.Diagnostics.CodeAnalysis;
using System.Net;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Pathoschild.Http.Client;
using StardewModdingAPI.Toolkit;
using StardewModdingAPI.Toolkit.Framework.UpdateData;
using StardewModdingAPI.Web.Framework.Clients.UpdateManifest.ResponseModels;
namespace StardewModdingAPI.Web.Framework.Clients.UpdateManifest
{
/// <summary>An API client for fetching update metadata from an arbitrary JSON URL.</summary>
internal class UpdateManifestClient : IUpdateManifestClient
{
/*********
** Fields
*********/
/// <summary>The underlying HTTP client.</summary>
private readonly IClient Client;
/*********
** Accessors
*********/
/// <summary>The unique key for the mod site.</summary>
public ModSiteKey SiteKey => ModSiteKey.UpdateManifest;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="userAgent">The user agent for the API client.</param>
public UpdateManifestClient(string userAgent)
{
this.Client = new FluentClient()
.SetUserAgent(userAgent);
this.Client.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/plain"));
}
/// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
public void Dispose()
{
this.Client.Dispose();
}
/// <inheritdoc/>
[SuppressMessage("ReSharper", "ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract", Justification = "This is the method which ensures the annotations are correct.")]
public async Task<IModPage?> GetModData(string id)
{
// get raw update manifest
UpdateManifestModel? manifest;
try
{
manifest = await this.Client.GetAsync(id).As<UpdateManifestModel?>();
if (manifest is null)
return this.GetFormatError(id, "manifest can't be empty");
}
catch (ApiException ex) when (ex.Status == HttpStatusCode.NotFound)
{
return new GenericModPage(this.SiteKey, id).SetError(RemoteModStatus.DoesNotExist, $"No update manifest found at {id}");
}
catch (Exception ex)
{
return this.GetFormatError(id, ex.Message);
}
// validate
if (!SemanticVersion.TryParse(manifest.Format, out _))
return this.GetFormatError(id, $"invalid format version '{manifest.Format}'");
foreach (UpdateManifestModModel mod in manifest.Mods.Values)
{
if (mod is null)
return this.GetFormatError(id, "a mod record can't be null");
if (string.IsNullOrWhiteSpace(mod.ModPageUrl))
return this.GetFormatError(id, $"all mods must have a {nameof(mod.ModPageUrl)} value");
foreach (UpdateManifestVersionModel? version in mod.Versions)
{
if (version is null)
return this.GetFormatError(id, "a version record can't be null");
if (string.IsNullOrWhiteSpace(version.Version))
return this.GetFormatError(id, $"all version records must have a {nameof(version.Version)} field");
if (!SemanticVersion.TryParse(version.Version, out _))
return this.GetFormatError(id, $"invalid mod version '{version.Version}'");
}
}
// build model
return new UpdateManifestModPage(id, manifest);
}
/*********
** Private methods
*********/
/// <summary>Get a mod page instance with an error indicating the update manifest is invalid.</summary>
/// <param name="url">The full URL to the update manifest.</param>
/// <param name="reason">A human-readable reason phrase indicating why it's invalid.</param>
private IModPage GetFormatError(string url, string reason)
{
return new GenericModPage(this.SiteKey, url).SetError(RemoteModStatus.InvalidData, $"The update manifest at {url} is invalid ({reason})");
}
}
}
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