Initial

.gitignore

@@ -1,4 +1,5 @@
-config/site.php
-files/cache/*
-files/tmp/*
-.htaccess
+.vs
+bin
+obj
+*.user
+publish

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace SteamDownloader
+{
+    class Program
+    {
+        static List<ulong> Files = new List<ulong>();
+        static string SteamId;
+        static string DownloadFolder => $"Screenshots{SteamId}";
+
+        static async Task Main( string[] args )
+        {
+            Console.WriteLine( "Hello, want to download some screenshots yeah?" );
+            Console.WriteLine();
+            Console.WriteLine( "Your SteamId is a long number, usually starting with 7.. ie 76561197960279927" );
+            Console.WriteLine( "You can paste in this window by right clicking" );
+
+            AskForSteamId:
+
+            Console.WriteLine();
+            Console.WriteLine( "Please type your SteamId:" );
+
+            SteamId = Console.ReadLine().Trim();
+
+            if ( !long.TryParse( SteamId, out var _ ) )
+            {
+                Console.Write( "That doesn't look right." );
+                goto AskForSteamId;
+            }
+
+            // Make sure the folder exists
+            if ( !System.IO.Directory.Exists( DownloadFolder ) )
+                System.IO.Directory.CreateDirectory( DownloadFolder );
+
+            // Scan all the pages for files
+            await ScanPages();
+
+            // Remove any duplicates
+            Files = Files.Distinct().ToList();
+
+            if ( Files.Count == 0 )
+            {
+                Console.WriteLine();
+                Console.WriteLine( "No screenshots found. Is the profile set to private?" );
+                return;
+            }
+
+            Console.WriteLine( $"Found {Files.Count()} Screenshots" );
+
+            // Download them all
+            await DownloadImages();
+
+            Console.WriteLine();
+            Console.WriteLine( $"All done! You can see the screenshots in \"/{DownloadFolder}/\"" );
+        }
+
+        static async Task ScanPages()
+        {
+            int page = 1;
+            while ( true )
+            {
+                Console.WriteLine( $"Getting Page {page} ({Files.Count} screenshots found)" );
+
+                int fails = 0;
+                while ( !await GetPage( page, SteamId ) )
+                {
+                    fails++;
+                    Console.WriteLine( $"Page {page} didn't have any screenshots" );
+
+                    if ( fails > 3 )
+                    {
+                        Console.WriteLine( $"I think we're at the end. Lets start grabbing the screenshots." );
+                        return;
+                    }
+
+                    Console.WriteLine( $"Retrying incase it was a server error.." );
+
+                    await Task.Delay( fails * 1000 );
+                }
+
+                await Task.Delay( 100 );
+                page++;
+            }
+        }
+
+        private static async Task<bool> GetPage( int pageid, string targetAccount )
+        {
+            try
+            {
+                using ( var client = new HttpClient() )
+                {
+                    var response = await client.GetStringAsync( $"https://steamcommunity.com/profiles/{targetAccount}/screenshots?p={pageid}&browsefilter=myfiles&view=grid&privacy=30" );
+
+                    var matches = Regex.Matches( response, "steamcommunity\\.com/sharedfiles/filedetails/\\?id\\=([0-9]+?)\"", RegexOptions.Singleline | RegexOptions.IgnoreCase );
+
+                    if ( matches.Count == 0 )
+                        return false;
+
+                    foreach ( Match match in matches )
+                    {
+                        Files.Add( ulong.Parse( match.Groups[1].Value ) );
+                    }
+                }
+
+                return true;
+            }
+            catch ( System.Exception e )
+            {
+                Console.Error.WriteLine( e.Message );
+                return false;
+            }
+        }
+
+        static async Task DownloadImages()
+        {
+            var tasks = new List<Task>();
+
+            foreach ( var file in Files )
+            {
+                var t = DownloadImage( file );
+
+                tasks.Add( t );
+
+                while ( tasks.Count > 16 )
+                {
+                    await Task.WhenAny( tasks );
+                    tasks.RemoveAll( x => x.IsCompleted );
+                }
+            }
+
+            await Task.WhenAll( tasks );
+        }
+
+        private static async Task<bool> DownloadImage( ulong file )
+        {
+            int tries = 0;
+
+            Retry:
+
+            tries++;
+
+            try
+            {
+                using ( var client = new HttpClient() )
+                {
+                    client.DefaultRequestHeaders.Add( "user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36" );
+
+                    var response = await client.GetStringAsync( $"https://steamcommunity.com/sharedfiles/filedetails/?id={file}" );
+
+                    var matches = Regex.Matches( response, "\\<a href\\=\"(https\\://steamuserimages-a.akamaihd.net/ugc/([A-Z0-9/].+?))\"", RegexOptions.Singleline | RegexOptions.IgnoreCase );
+
+                    if ( matches.Count == 0 )
+                    {
+                        Console.WriteLine( $"[{file}] - couldn't find image link" );
+                        return false;
+                    }
+
+                    var imageUrl = matches.First().Groups[1].Value;
+
+                    Console.WriteLine( $"[{file}] - downloading {imageUrl}" );
+
+                    var download = await client.GetAsync( imageUrl );
+
+                    var cd = download.Content.Headers.GetValues( "Content-Disposition" ).First();
+
+                    var filename = Regex.Match( cd, "filename\\*?=(?:UTF-8'')?\"?(.+)" ).Groups[1].Value.Trim( ';', ' ', '"' );
+
+                    var data = await download.Content.ReadAsByteArrayAsync();
+
+                    System.IO.File.WriteAllBytes( $"{DownloadFolder}/{filename}", data );
+
+                    return true;
+                }
+            }
+            catch ( System.Exception e )
+            {
+                Console.Error.WriteLine( e.Message );
+
+                if ( tries < 3 )
+                {
+                    await Task.Delay( 3000 * tries );
+                    goto Retry;
+                }
+
+                return false;
+            }
+        }
+    }
+}

Properties/PublishProfiles/FolderProfile.pubxml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+https://go.microsoft.com/fwlink/?LinkID=208121. 
+-->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <Configuration>Release</Configuration>
+    <Platform>Any CPU</Platform>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <PublishDir>publish\</PublishDir>
+    <RuntimeIdentifier>win-x86</RuntimeIdentifier>
+    <SelfContained>false</SelfContained>
+    <PublishSingleFile>True</PublishSingleFile>
+    <PublishReadyToRun>True</PublishReadyToRun>
+  </PropertyGroup>
+</Project>

SteamScreenshotDownloader.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <PublishSingleFile>true</PublishSingleFile>
+    <RuntimeIdentifier>win-x86</RuntimeIdentifier>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+
+</Project>

SteamScreenshotDownloader.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29806.167
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SteamScreenshotDownloader", "SteamScreenshotDownloader.csproj", "{650E8F81-5678-4CE3-831F-B5E4A89418E8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{650E8F81-5678-4CE3-831F-B5E4A89418E8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{650E8F81-5678-4CE3-831F-B5E4A89418E8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{650E8F81-5678-4CE3-831F-B5E4A89418E8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{650E8F81-5678-4CE3-831F-B5E4A89418E8}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6D77E2C3-3B47-4B11-A043-7FEE8473D3C1}
+	EndGlobalSection
+EndGlobal