RC2BotArchiver/RC2BotArchiver/DownloadImages.cs

using System.Text.Json;
using System.Text.Json.Serialization;

namespace RC2BotArchiver;

public static class DownloadImages
{
    public static async Task DoIt(HttpClient client)
    {
        foreach (var dir in Directory.EnumerateDirectories("robots"))
        {
            var json = await File.ReadAllTextAsync(Path.Combine(dir, "metadata.json"));
            var doc = JsonDocument.Parse(json);
            var url = doc.RootElement.GetProperty("image").GetString();
            if (url is null) continue;
            var response = await client.GetAsync(url);
            await using var stream = await response.Content.ReadAsStreamAsync();
            await using var fs = File.OpenWrite(Path.Combine(dir, "thumbnail.jpeg"));
            await stream.CopyToAsync(fs);
            Console.WriteLine($"Saved image for {doc.RootElement.GetProperty("name")}");
        }
    }
}