SAP GWQ

2026-04-14 10:54:52 +02:00
parent df90a4a172
commit 36a22202bf
14 changed files with 678 additions and 78 deletions
@@ -0,0 +1,36 @@
+using System.Net.Http.Headers;
+using System.Text;
+using Microsoft.Data.Sqlite;
+
+var conn = new SqliteConnection(@"Data Source=C:\Users\koi\source\repos\Ai\TrafagSalesExporter\trafag_exporter.db");
+await conn.OpenAsync();
+string sapUsername = "", sapPassword = "";
+var cmd = conn.CreateCommand();
+cmd.CommandText = "select SapUsername, SapPassword from ExportSettings limit 1";
+using (var r = await cmd.ExecuteReaderAsync())
+{
+    if (await r.ReadAsync())
+    {
+        sapUsername = r.IsDBNull(0) ? "" : r.GetString(0);
+        sapPassword = r.IsDBNull(1) ? "" : r.GetString(1);
+    }
+}
+if (string.IsNullOrWhiteSpace(sapUsername) || string.IsNullOrWhiteSpace(sapPassword)) throw new Exception("Central SAP credentials missing");
+var serviceUrl = @"http://travt762.sap.trafag.com:8000/sap/opu/odata/sap/ZPOWERBI_EINKAUF_SRV/";
+using var client = new HttpClient();
+client.Timeout = TimeSpan.FromSeconds(20);
+client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{sapUsername}:{sapPassword}")));
+foreach (var url in new[]{ serviceUrl, serviceUrl + "" })
+{
+    Console.WriteLine($"URL|{url}");
+    using var response = await client.GetAsync(url);
+    Console.WriteLine($"STATUS|{(int)response.StatusCode}|{response.ReasonPhrase}");
+    foreach (var header in response.Headers)
+        Console.WriteLine($"HEADER|{header.Key}|{string.Join(",", header.Value)}");
+    foreach (var header in response.Content.Headers)
+        Console.WriteLine($"HEADER|{header.Key}|{string.Join(",", header.Value)}");
+    var body = await response.Content.ReadAsStringAsync();
+    Console.WriteLine("BODY_START");
+    Console.WriteLine(body.Length > 5000 ? body[..5000] : body);
+    Console.WriteLine("BODY_END");
+}
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.11" />
+  </ItemGroup>
+</Project>
@@ -7,6 +7,7 @@
@inject ISharePointUploadService SpService
@inject TimerBackgroundService TimerService
@inject IHanaQueryService HanaService
+@inject ISapGatewayService SapGatewayService
@inject ISnackbar Snackbar

 <PageTitle>Settings</PageTitle>
@@ -240,6 +241,17 @@
    }

    private async Task TestCentralCredentials(string sourceSystem)
+    {
+        if (sourceSystem == "SAP")
+        {
+            await TestCentralSapCredentials();
+            return;
+        }
+
+        await TestCentralHanaCredentials(sourceSystem);
+    }
+
+    private async Task TestCentralHanaCredentials(string sourceSystem)
    {
        if (!_testingSystems.Add(sourceSystem))
            return;
@@ -297,6 +309,49 @@
        }
    }

+    private async Task TestCentralSapCredentials()
+    {
+        const string sourceSystem = "SAP";
+        if (!_testingSystems.Add(sourceSystem))
+            return;
+
+        try
+        {
+            var username = GetCentralUsername(sourceSystem);
+            var password = GetCentralPassword(sourceSystem);
+
+            if (string.IsNullOrWhiteSpace(username) || string.IsNullOrWhiteSpace(password))
+            {
+                Snackbar.Add("Für SAP sind keine zentralen Gateway-Zugangsdaten gepflegt.", Severity.Warning);
+                return;
+            }
+
+            using var db = await DbFactory.CreateDbContextAsync();
+            var site = await db.Sites
+                .Where(s => (string.IsNullOrWhiteSpace(s.SourceSystem) ? "SAP" : s.SourceSystem) == sourceSystem
+                    && !string.IsNullOrWhiteSpace(s.SapServiceUrl))
+                .OrderBy(s => s.Land)
+                .FirstOrDefaultAsync();
+
+            if (site is null)
+            {
+                Snackbar.Add("Kein SAP-Standort mit Service URL gefunden.", Severity.Warning);
+                return;
+            }
+
+            await SapGatewayService.TestConnectionAsync(site.SapServiceUrl, username.Trim(), password.Trim());
+            Snackbar.Add($"SAP: Gateway-Verbindung erfolgreich über Standort '{site.Land}'.", Severity.Success);
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"SAP: {ex.Message}", Severity.Error);
+        }
+        finally
+        {
+            _testingSystems.Remove(sourceSystem);
+        }
+    }
+
    private string GetCentralUsername(string sourceSystem) => sourceSystem switch
    {
        "BI1" => _exportSettings.Bi1Username,
@@ -1,9 +1,12 @@
@page "/standorte"
@using Microsoft.EntityFrameworkCore
+@using System.Text.Json
@using TrafagSalesExporter.Data
+@using TrafagSalesExporter.Models
@using TrafagSalesExporter.Services
@inject IDbContextFactory<AppDbContext> DbFactory
@inject IHanaQueryService HanaService
+@inject ISapGatewayService SapGatewayService
@inject ISnackbar Snackbar
@inject IDialogService DialogService

@@ -71,7 +74,7 @@
            <MudTh>TSC</MudTh>
            <MudTh>Schema</MudTh>
            <MudTh>Quellsystem</MudTh>
-            <MudTh>Host</MudTh>
+            <MudTh>Quelle</MudTh>
            <MudTh>Aktiv</MudTh>
            <MudTh>Aktionen</MudTh>
        </HeaderContent>
@@ -80,7 +83,7 @@
            <MudTd>@context.TSC</MudTd>
            <MudTd>@context.Schema</MudTd>
            <MudTd>@context.SourceSystem</MudTd>
-            <MudTd>@GetServerNode(context.HanaServer)</MudTd>
+            <MudTd>@GetConnectionTarget(context)</MudTd>
            <MudTd>
                @if (context.IsActive)
                {
@@ -122,8 +125,8 @@
                      HelperText="Optional, z.B. sslCryptoProvider=openssl;communicationTimeout=0" />
    </DialogContent>
    <DialogActions>
-        <MudButton OnClick="() => _serverDialogVisible = false">Abbrechen</MudButton>
-        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="SaveServer">Speichern</MudButton>
+        <MudButton OnClick="CloseServerDialog">Abbrechen</MudButton>
+        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="SaveServer" Disabled="_savingServer">Speichern</MudButton>
    </DialogActions>
 </MudDialog>

@@ -138,7 +141,7 @@
        <MudSelect @bind-Value="_editingSite.SourceSystem" Label="Quellsystem" Required>
            @foreach (var system in _sourceSystems)
            {
-                <MudSelectItem Value="system">@system</MudSelectItem>
+                <MudSelectItem Value="@system">@system</MudSelectItem>
            }
        </MudSelect>
        <MudTextField @bind-Value="_editingSite.UsernameOverride" Label="Username Override"
@@ -149,29 +152,67 @@

        <MudDivider Class="my-4" />

-        <MudText Typo="Typo.h6" Class="mb-2">HANA-Verbindung</MudText>
-        <MudAlert Severity="Severity.Info" Dense="true" Variant="Variant.Outlined" Class="mb-3">
-            Host, Port und technische HANA-Parameter kommen von dieser Verbindung. Username und Password hier dienen nur noch als Fallback für bestehende Einträge.
-        </MudAlert>
-        <MudTextField @bind-Value="_editingSiteServer.Name" Label="Verbindungsname" Required
-                      HelperText="Interner Anzeigename für diesen Standort" />
-        <MudTextField @bind-Value="_editingSiteServer.Host" Label="Host oder ServerNode" Required
-                      HelperText="z.B. hana01 oder hana01:30015 oder derselbe HanaServer-Wert wie in Power BI" />
-        <MudNumericField @bind-Value="_editingSiteServer.Port" Label="Port"
-                         HelperText="Wird ignoriert, wenn im Host bereits ein Port enthalten ist" />
-        <MudTextField @bind-Value="_editingSiteServer.Username" Label="Username" />
-        <MudTextField @bind-Value="_editingSiteServer.Password" Label="Password" InputType="InputType.Password" />
-        <MudTextField @bind-Value="_editingSiteServer.DatabaseName" Label="Database Name (MDC)"
-                      HelperText="Nur bei Multi-Tenant Setup angeben, sonst leer lassen" />
-        <MudSwitch @bind-Value="_editingSiteServer.UseSsl" Label="SSL/TLS verwenden (encrypt=true)" Color="Color.Primary" />
-        <MudSwitch @bind-Value="_editingSiteServer.ValidateCertificate" Label="SSL-Zertifikat validieren" Color="Color.Primary"
-                   Disabled="!_editingSiteServer.UseSsl" />
-        <MudTextField @bind-Value="_editingSiteServer.AdditionalParams" Label="Zusätzliche Parameter"
-                      HelperText="Optional, z.B. sslCryptoProvider=openssl;communicationTimeout=0" />
+        @if (IsSapSite())
+        {
+            <MudText Typo="Typo.h6" Class="mb-2">SAP Gateway</MudText>
+            <MudAlert Severity="Severity.Info" Dense="true" Variant="Variant.Outlined" Class="mb-3">
+                Die Service-URL zeigt auf den OData-Service. Die verfügbaren Entity Sets werden nur per Knopfdruck aktualisiert und lokal zwischengespeichert.
+            </MudAlert>
+            <MudTextField @bind-Value="_editingSite.SapServiceUrl" Label="SAP Service URL" Required
+                          HelperText="z.B. http://server:8000/sap/opu/odata/sap/ZPOWERBI_EINKAUF_SRV/" />
+            <MudStack Row Spacing="2" Class="mb-3">
+                <MudButton Variant="Variant.Outlined" Color="Color.Info" OnClick="RefreshSapEntitySets"
+                           StartIcon="@Icons.Material.Filled.Refresh" Disabled="_refreshingSapEntitySets">
+                    @if (_refreshingSapEntitySets)
+                    {
+                        <MudProgressCircular Size="Size.Small" Indeterminate Class="mr-2" />
+                        @("Lade...")
+                    }
+                    else
+                    {
+                        @("Quellen refreshen")
+                    }
+                </MudButton>
+                @if (_editingSite.SapEntitySetsRefreshedAtUtc.HasValue)
+                {
+                    <MudText Typo="Typo.caption" Class="mt-2">
+                        Letzter Refresh: @_editingSite.SapEntitySetsRefreshedAtUtc.Value.ToLocalTime().ToString("yyyy-MM-dd HH:mm:ss")
+                    </MudText>
+                }
+            </MudStack>
+            <MudSelect @bind-Value="_editingSite.SapEntitySet" Label="SAP Entity Set" Required>
+                @foreach (var entitySet in _sapEntitySetsCache)
+                {
+                    <MudSelectItem Value="@entitySet">@entitySet</MudSelectItem>
+                }
+            </MudSelect>
+        }
+        else
+        {
+            <MudText Typo="Typo.h6" Class="mb-2">HANA-Verbindung</MudText>
+            <MudAlert Severity="Severity.Info" Dense="true" Variant="Variant.Outlined" Class="mb-3">
+                Host, Port und technische HANA-Parameter kommen von dieser Verbindung. Username und Password hier dienen nur noch als Fallback für bestehende Einträge.
+            </MudAlert>
+            <MudTextField @bind-Value="_editingSiteServer.Name" Label="Verbindungsname" Required
+                          HelperText="Interner Anzeigename für diesen Standort" />
+            <MudTextField @bind-Value="_editingSiteServer.Host" Label="Host oder ServerNode" Required
+                          HelperText="z.B. hana01 oder hana01:30015 oder derselbe HanaServer-Wert wie in Power BI" />
+            <MudNumericField @bind-Value="_editingSiteServer.Port" Label="Port"
+                             HelperText="Wird ignoriert, wenn im Host bereits ein Port enthalten ist" />
+            <MudTextField @bind-Value="_editingSiteServer.Username" Label="Username" />
+            <MudTextField @bind-Value="_editingSiteServer.Password" Label="Password" InputType="InputType.Password" />
+            <MudTextField @bind-Value="_editingSiteServer.DatabaseName" Label="Database Name (MDC)"
+                          HelperText="Nur bei Multi-Tenant Setup angeben, sonst leer lassen" />
+            <MudSwitch @bind-Value="_editingSiteServer.UseSsl" Label="SSL/TLS verwenden (encrypt=true)" Color="Color.Primary" />
+            <MudSwitch @bind-Value="_editingSiteServer.ValidateCertificate" Label="SSL-Zertifikat validieren" Color="Color.Primary"
+                       Disabled="!_editingSiteServer.UseSsl" />
+            <MudTextField @bind-Value="_editingSiteServer.AdditionalParams" Label="Zusätzliche Parameter"
+                          HelperText="Optional, z.B. sslCryptoProvider=openssl;communicationTimeout=0" />
+        }
    </DialogContent>
    <DialogActions>
-        <MudButton OnClick="() => _siteDialogVisible = false">Abbrechen</MudButton>
-        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="SaveSite">Speichern</MudButton>
+        <MudButton OnClick="CloseSiteDialog" Disabled="_savingSite">Abbrechen</MudButton>
+        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="SaveSite" Disabled="_savingSite || _refreshingSapEntitySets">Speichern</MudButton>
    </DialogActions>
 </MudDialog>

@@ -180,11 +221,15 @@
    private readonly Dictionary<int, ConnectionTestResult> _connectionStatus = new();
    private List<HanaServer> _servers = new();
    private List<Site> _sites = new();
+    private List<string> _sapEntitySetsCache = [];
    private HanaServer _editingServer = new();
    private Site _editingSite = new();
    private HanaServer _editingSiteServer = new();
    private bool _serverDialogVisible;
    private bool _siteDialogVisible;
+    private bool _refreshingSapEntitySets;
+    private bool _savingServer;
+    private bool _savingSite;
    private readonly DialogOptions _dialogOptions = new() { MaxWidth = MaxWidth.Small, FullWidth = true };

    protected override async Task OnInitializedAsync()
@@ -213,6 +258,12 @@

    private async Task SaveServer()
    {
+        if (_savingServer)
+            return;
+
+        _savingServer = true;
+        try
+        {
        using var db = await DbFactory.CreateDbContextAsync();
        if (_editingServer.Id == 0)
        {
@@ -239,6 +290,11 @@
        _serverDialogVisible = false;
        await LoadDataAsync();
        Snackbar.Add("Server gespeichert", Severity.Success);
+        }
+        finally
+        {
+            _savingServer = false;
+        }
    }

    private async Task DeleteServer(HanaServer server)
@@ -294,6 +350,7 @@
            SourceSystem = "SAP",
            HanaServerId = 0
        };
+        _sapEntitySetsCache = [];
        _editingSiteServer = CreateDefaultSiteServer();
        _siteDialogVisible = true;
    }
@@ -310,8 +367,13 @@
            SourceSystem = string.IsNullOrWhiteSpace(site.SourceSystem) ? "SAP" : site.SourceSystem,
            UsernameOverride = site.UsernameOverride,
            PasswordOverride = site.PasswordOverride,
+            SapServiceUrl = site.SapServiceUrl,
+            SapEntitySet = site.SapEntitySet,
+            SapEntitySetsCache = site.SapEntitySetsCache,
+            SapEntitySetsRefreshedAtUtc = site.SapEntitySetsRefreshedAtUtc,
            IsActive = site.IsActive
        };
+        _sapEntitySetsCache = ParseSapEntitySets(site.SapEntitySetsCache);
        _editingSiteServer = site.HanaServer is null
            ? CreateDefaultSiteServer(site)
            : CloneServer(site.HanaServer);
@@ -320,34 +382,54 @@

    private async Task SaveSite()
    {
-        using var db = await DbFactory.CreateDbContextAsync();
-        var serverId = await SaveOrCreateSiteServerAsync(db);
+        if (_savingSite)
+            return;

-        if (_editingSite.Id == 0)
+        _savingSite = true;
+        try
        {
+            using var db = await DbFactory.CreateDbContextAsync();
+            var serverId = IsSapSite() ? (int?)null : await SaveOrCreateSiteServerAsync(db);
            _editingSite.HanaServerId = serverId;
-            db.Sites.Add(_editingSite);
-        }
-        else
-        {
-            var existing = await db.Sites.FindAsync(_editingSite.Id);
-            if (existing is not null)
-            {
-                existing.HanaServerId = serverId;
-                existing.Schema = _editingSite.Schema;
-                existing.TSC = _editingSite.TSC;
-                existing.Land = _editingSite.Land;
-                existing.SourceSystem = _editingSite.SourceSystem;
-                existing.UsernameOverride = _editingSite.UsernameOverride;
-                existing.PasswordOverride = _editingSite.PasswordOverride;
-                existing.IsActive = _editingSite.IsActive;
-            }
-        }
+            _editingSite.SapEntitySetsCache = SerializeSapEntitySets(_sapEntitySetsCache);

-        await db.SaveChangesAsync();
-        _siteDialogVisible = false;
-        await LoadDataAsync();
-        Snackbar.Add("Standort gespeichert", Severity.Success);
+            if (_editingSite.Id == 0)
+            {
+                db.Sites.Add(_editingSite);
+            }
+            else
+            {
+                var existing = await db.Sites.FindAsync(_editingSite.Id);
+                if (existing is not null)
+                {
+                    existing.HanaServerId = serverId;
+                    existing.Schema = _editingSite.Schema;
+                    existing.TSC = _editingSite.TSC;
+                    existing.Land = _editingSite.Land;
+                    existing.SourceSystem = _editingSite.SourceSystem;
+                    existing.UsernameOverride = _editingSite.UsernameOverride;
+                    existing.PasswordOverride = _editingSite.PasswordOverride;
+                    existing.SapServiceUrl = _editingSite.SapServiceUrl;
+                    existing.SapEntitySet = _editingSite.SapEntitySet;
+                    existing.SapEntitySetsCache = _editingSite.SapEntitySetsCache;
+                    existing.SapEntitySetsRefreshedAtUtc = _editingSite.SapEntitySetsRefreshedAtUtc;
+                    existing.IsActive = _editingSite.IsActive;
+                }
+            }
+
+            await db.SaveChangesAsync();
+            _siteDialogVisible = false;
+            await LoadDataAsync();
+            Snackbar.Add("Standort gespeichert", Severity.Success);
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"Speichern fehlgeschlagen: {ex.Message}", Severity.Error);
+        }
+        finally
+        {
+            _savingSite = false;
+        }
    }

    private async Task DeleteSite(Site site)
@@ -379,6 +461,15 @@
        return server.Host.Contains(':', StringComparison.Ordinal) ? server.Host : $"{server.Host}:{server.Port}";
    }

+    private static string GetConnectionTarget(Site site)
+    {
+        var sourceSystem = string.IsNullOrWhiteSpace(site.SourceSystem) ? "SAP" : site.SourceSystem;
+        if (string.Equals(sourceSystem, "SAP", StringComparison.OrdinalIgnoreCase))
+            return string.IsNullOrWhiteSpace(site.SapServiceUrl) ? "-" : site.SapServiceUrl;
+
+        return GetServerNode(site.HanaServer);
+    }
+
    private HanaServer CreateDefaultSiteServer(Site? site = null)
    {
        var label = !string.IsNullOrWhiteSpace(site?.Land) ? site!.Land : site?.TSC;
@@ -416,6 +507,8 @@
            : _editingSiteServer.Name.Trim();
        _editingSite.UsernameOverride = _editingSite.UsernameOverride.Trim();
        _editingSite.PasswordOverride = _editingSite.PasswordOverride.Trim();
+        _editingSite.SapServiceUrl = _editingSite.SapServiceUrl.Trim();
+        _editingSite.SapEntitySet = _editingSite.SapEntitySet.Trim();
        _editingSiteServer.Host = _editingSiteServer.Host.Trim();
        _editingSiteServer.Username = _editingSiteServer.Username.Trim();
        _editingSiteServer.DatabaseName = _editingSiteServer.DatabaseName.Trim();
@@ -461,4 +554,82 @@
        await db.SaveChangesAsync();
        return existingServer.Id;
    }
+
+    private bool IsSapSite() => string.Equals(_editingSite.SourceSystem, "SAP", StringComparison.OrdinalIgnoreCase);
+
+    private async Task RefreshSapEntitySets()
+    {
+        if (_refreshingSapEntitySets)
+            return;
+
+        _refreshingSapEntitySets = true;
+        try
+        {
+            if (string.IsNullOrWhiteSpace(_editingSite.SapServiceUrl))
+                throw new InvalidOperationException("SAP Service URL muss gesetzt sein.");
+
+            using var db = await DbFactory.CreateDbContextAsync();
+            var settings = await db.ExportSettings.FirstOrDefaultAsync() ?? new();
+            var username = string.IsNullOrWhiteSpace(_editingSite.UsernameOverride) ? settings.SapUsername : _editingSite.UsernameOverride;
+            var password = string.IsNullOrWhiteSpace(_editingSite.PasswordOverride) ? settings.SapPassword : _editingSite.PasswordOverride;
+
+            if (string.IsNullOrWhiteSpace(username) || string.IsNullOrWhiteSpace(password))
+                throw new InvalidOperationException("Für SAP sind weder zentrale Zugangsdaten noch Standort-Overrides gesetzt.");
+
+            var entitySets = await SapGatewayService.GetEntitySetsAsync(_editingSite.SapServiceUrl, username.Trim(), password.Trim());
+            _sapEntitySetsCache = entitySets;
+            _editingSite.SapEntitySetsCache = SerializeSapEntitySets(entitySets);
+            _editingSite.SapEntitySetsRefreshedAtUtc = DateTime.UtcNow;
+
+            if (!string.IsNullOrWhiteSpace(_editingSite.SapEntitySet) &&
+                !_sapEntitySetsCache.Contains(_editingSite.SapEntitySet, StringComparer.OrdinalIgnoreCase))
+            {
+                _editingSite.SapEntitySet = string.Empty;
+            }
+
+            Snackbar.Add($"{entitySets.Count} SAP Entity Sets geladen.", Severity.Success);
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add(ex.Message, Severity.Error);
+        }
+        finally
+        {
+            _refreshingSapEntitySets = false;
+        }
+    }
+
+    private void CloseServerDialog()
+    {
+        if (_savingServer)
+            return;
+
+        _serverDialogVisible = false;
+    }
+
+    private void CloseSiteDialog()
+    {
+        if (_savingSite || _refreshingSapEntitySets)
+            return;
+
+        _siteDialogVisible = false;
+    }
+
+    private static List<string> ParseSapEntitySets(string json)
+    {
+        if (string.IsNullOrWhiteSpace(json))
+            return [];
+
+        try
+        {
+            return JsonSerializer.Deserialize<List<string>>(json) ?? [];
+        }
+        catch
+        {
+            return [];
+        }
+    }
+
+    private static string SerializeSapEntitySets(List<string> entitySets)
+        => JsonSerializer.Serialize(entitySets);
 }
@@ -7,7 +7,7 @@ public class Site
 {
    public int Id { get; set; }

-    public int HanaServerId { get; set; }
+    public int? HanaServerId { get; set; }

    [ForeignKey(nameof(HanaServerId))]
    public HanaServer? HanaServer { get; set; }
@@ -28,5 +28,13 @@ public class Site

    public string PasswordOverride { get; set; } = string.Empty;

+    public string SapServiceUrl { get; set; } = string.Empty;
+
+    public string SapEntitySet { get; set; } = string.Empty;
+
+    public string SapEntitySetsCache { get; set; } = string.Empty;
+
+    public DateTime? SapEntitySetsRefreshedAtUtc { get; set; }
+
    public bool IsActive { get; set; } = true;
 }
@@ -16,6 +16,7 @@ builder.Services.AddDbContextFactory<AppDbContext>(options =>
 builder.Services.AddSingleton<IHanaQueryService, HanaQueryService>();
 builder.Services.AddSingleton<IExcelExportService, ExcelExportService>();
 builder.Services.AddSingleton<ISharePointUploadService, SharePointUploadService>();
+builder.Services.AddSingleton<ISapGatewayService, SapGatewayService>();
 builder.Services.AddSingleton<ITransformationStrategy, CopyTransformationStrategy>();
 builder.Services.AddSingleton<ITransformationStrategy, UppercaseTransformationStrategy>();
 builder.Services.AddSingleton<ITransformationStrategy, LowercaseTransformationStrategy>();
@@ -24,6 +24,7 @@ public class DatabaseInitializationService : IDatabaseInitializationService

    private static void EnsureSchema(AppDbContext db)
    {
+        EnsureSitesTableSupportsOptionalHanaServer(db);
        AddColumnIfMissing(db, "HanaServers", "DatabaseName", "TEXT NOT NULL DEFAULT ''");
        AddColumnIfMissing(db, "HanaServers", "UseSsl", "INTEGER NOT NULL DEFAULT 0");
        AddColumnIfMissing(db, "HanaServers", "ValidateCertificate", "INTEGER NOT NULL DEFAULT 0");
@@ -31,6 +32,10 @@ public class DatabaseInitializationService : IDatabaseInitializationService
        AddColumnIfMissing(db, "Sites", "SourceSystem", "TEXT NOT NULL DEFAULT 'SAP'");
        AddColumnIfMissing(db, "Sites", "UsernameOverride", "TEXT NOT NULL DEFAULT ''");
        AddColumnIfMissing(db, "Sites", "PasswordOverride", "TEXT NOT NULL DEFAULT ''");
+        AddColumnIfMissing(db, "Sites", "SapServiceUrl", "TEXT NOT NULL DEFAULT ''");
+        AddColumnIfMissing(db, "Sites", "SapEntitySet", "TEXT NOT NULL DEFAULT ''");
+        AddColumnIfMissing(db, "Sites", "SapEntitySetsCache", "TEXT NOT NULL DEFAULT ''");
+        AddColumnIfMissing(db, "Sites", "SapEntitySetsRefreshedAtUtc", "TEXT NULL");
        AddColumnIfMissing(db, "ExportSettings", "SapUsername", "TEXT NOT NULL DEFAULT ''");
        AddColumnIfMissing(db, "ExportSettings", "SapPassword", "TEXT NOT NULL DEFAULT ''");
        AddColumnIfMissing(db, "ExportSettings", "Bi1Username", "TEXT NOT NULL DEFAULT ''");
@@ -40,6 +45,104 @@ public class DatabaseInitializationService : IDatabaseInitializationService
        EnsureTransformationTable(db);
    }

+    private static void EnsureSitesTableSupportsOptionalHanaServer(AppDbContext db)
+    {
+        var conn = db.Database.GetDbConnection();
+        if (conn.State != ConnectionState.Open)
+            conn.Open();
+
+        var hanaServerIdIsRequired = false;
+        {
+            using var pragma = conn.CreateCommand();
+            pragma.CommandText = "PRAGMA table_info(Sites)";
+            using var reader = pragma.ExecuteReader();
+
+            while (reader.Read())
+            {
+                if (string.Equals(reader["name"]?.ToString(), "HanaServerId", StringComparison.OrdinalIgnoreCase))
+                {
+                    hanaServerIdIsRequired = Convert.ToInt32(reader["notnull"]) == 1;
+                    break;
+                }
+            }
+        }
+
+        if (!hanaServerIdIsRequired)
+            return;
+
+        using var disableFk = conn.CreateCommand();
+        disableFk.CommandText = "PRAGMA foreign_keys = OFF;";
+        disableFk.ExecuteNonQuery();
+
+        using var transaction = conn.BeginTransaction();
+
+        using (var rename = conn.CreateCommand())
+        {
+            rename.Transaction = transaction;
+            rename.CommandText = "ALTER TABLE Sites RENAME TO Sites_old;";
+            rename.ExecuteNonQuery();
+        }
+
+        using (var create = conn.CreateCommand())
+        {
+            create.Transaction = transaction;
+            create.CommandText = @"
+CREATE TABLE Sites (
+    Id INTEGER NOT NULL CONSTRAINT PK_Sites PRIMARY KEY AUTOINCREMENT,
+    HanaServerId INTEGER NULL,
+    Schema TEXT NOT NULL,
+    TSC TEXT NOT NULL,
+    Land TEXT NOT NULL,
+    SourceSystem TEXT NOT NULL DEFAULT 'SAP',
+    UsernameOverride TEXT NOT NULL DEFAULT '',
+    PasswordOverride TEXT NOT NULL DEFAULT '',
+    SapServiceUrl TEXT NOT NULL DEFAULT '',
+    SapEntitySet TEXT NOT NULL DEFAULT '',
+    SapEntitySetsCache TEXT NOT NULL DEFAULT '',
+    SapEntitySetsRefreshedAtUtc TEXT NULL,
+    IsActive INTEGER NOT NULL,
+    CONSTRAINT FK_Sites_HanaServers_HanaServerId FOREIGN KEY (HanaServerId) REFERENCES HanaServers (Id)
+);";
+            create.ExecuteNonQuery();
+        }
+
+        using (var copy = conn.CreateCommand())
+        {
+            copy.Transaction = transaction;
+            copy.CommandText = @"
+INSERT INTO Sites (
+    Id, HanaServerId, Schema, TSC, Land, SourceSystem,
+    UsernameOverride, PasswordOverride, SapServiceUrl, SapEntitySet,
+    SapEntitySetsCache, SapEntitySetsRefreshedAtUtc, IsActive
+)
+SELECT
+    Id, HanaServerId, Schema, TSC, Land,
+    COALESCE(SourceSystem, 'SAP'),
+    COALESCE(UsernameOverride, ''),
+    COALESCE(PasswordOverride, ''),
+    COALESCE(SapServiceUrl, ''),
+    COALESCE(SapEntitySet, ''),
+    COALESCE(SapEntitySetsCache, ''),
+    SapEntitySetsRefreshedAtUtc,
+    IsActive
+FROM Sites_old;";
+            copy.ExecuteNonQuery();
+        }
+
+        using (var drop = conn.CreateCommand())
+        {
+            drop.Transaction = transaction;
+            drop.CommandText = "DROP TABLE Sites_old;";
+            drop.ExecuteNonQuery();
+        }
+
+        transaction.Commit();
+
+        using var enableFk = conn.CreateCommand();
+        enableFk.CommandText = "PRAGMA foreign_keys = ON;";
+        enableFk.ExecuteNonQuery();
+    }
+
    private static void AddColumnIfMissing(AppDbContext db, string table, string column, string type)
    {
        var conn = db.Database.GetDbConnection();
@@ -23,6 +23,16 @@ public class ExcelExportService : IExcelExportService
        return fullPath;
    }

+    public string CreateGenericExcelFile(string outputDirectory, string filePrefix, DateTime fileDate, string worksheetName, IReadOnlyList<IReadOnlyDictionary<string, object?>> rows)
+    {
+        Directory.CreateDirectory(outputDirectory);
+        var safePrefix = string.IsNullOrWhiteSpace(filePrefix) ? "Export" : filePrefix.Trim();
+        var fileName = $"{safePrefix}_{fileDate:yyyy-MM-dd}.xlsx";
+        var fullPath = Path.Combine(outputDirectory, fileName);
+        WriteGenericWorkbook(fullPath, worksheetName, rows);
+        return fullPath;
+    }
+
    private static void WriteWorkbook(string fullPath, List<SalesRecord> records)
    {
        using var workbook = new XLWorkbook();
@@ -99,4 +109,35 @@ public class ExcelExportService : IExcelExportService
        ws.Columns().AdjustToContents();
        workbook.SaveAs(fullPath);
    }
+
+    private static void WriteGenericWorkbook(string fullPath, string worksheetName, IReadOnlyList<IReadOnlyDictionary<string, object?>> rows)
+    {
+        using var workbook = new XLWorkbook();
+        var sheetName = string.IsNullOrWhiteSpace(worksheetName) ? "Export" : worksheetName.Trim();
+        var ws = workbook.Worksheets.Add(sheetName.Length > 31 ? sheetName[..31] : sheetName);
+
+        var headers = rows
+            .SelectMany(r => r.Keys)
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .ToList();
+
+        for (var i = 0; i < headers.Count; i++)
+        {
+            ws.Cell(1, i + 1).Value = headers[i];
+            ws.Cell(1, i + 1).Style.Font.Bold = true;
+        }
+
+        for (var rowIndex = 0; rowIndex < rows.Count; rowIndex++)
+        {
+            var row = rows[rowIndex];
+            for (var colIndex = 0; colIndex < headers.Count; colIndex++)
+            {
+                row.TryGetValue(headers[colIndex], out var value);
+                ws.Cell(rowIndex + 2, colIndex + 1).Value = value?.ToString() ?? string.Empty;
+            }
+        }
+
+        ws.Columns().AdjustToContents();
+        workbook.SaveAs(fullPath);
+    }
 }
@@ -70,7 +70,6 @@ public class ExportOrchestrationService

    private async Task<SiteExportResult?> ExportSiteAsync(Site site)
    {
-        if (site.HanaServer is null) return null;
        SiteExportResult? result = null;

        lock (_lock)
@@ -6,4 +6,5 @@ public interface IExcelExportService
 {
    string CreateExcelFile(string outputDirectory, string tsc, DateTime fileDate, List<SalesRecord> records);
    string CreateConsolidatedExcelFile(string outputDirectory, DateTime fileDate, List<SalesRecord> records);
+    string CreateGenericExcelFile(string outputDirectory, string filePrefix, DateTime fileDate, string worksheetName, IReadOnlyList<IReadOnlyDictionary<string, object?>> rows);
 }
@@ -0,0 +1,8 @@
+namespace TrafagSalesExporter.Services;
+
+public interface ISapGatewayService
+{
+    Task TestConnectionAsync(string serviceUrl, string username, string password, CancellationToken cancellationToken = default);
+    Task<List<string>> GetEntitySetsAsync(string serviceUrl, string username, string password, CancellationToken cancellationToken = default);
+    Task<List<Dictionary<string, object?>>> GetEntityRowsAsync(string serviceUrl, string entitySet, string username, string password, CancellationToken cancellationToken = default);
+}
@@ -0,0 +1,140 @@
+using System.Net.Http.Headers;
+using System.Text;
+using System.Text.Json;
+using System.Xml.Linq;
+
+namespace TrafagSalesExporter.Services;
+
+public class SapGatewayService : ISapGatewayService
+{
+    private static readonly XNamespace AppNs = "http://www.w3.org/2007/app";
+    private static readonly XNamespace EdmNs = "http://docs.oasis-open.org/odata/ns/edm";
+
+    public async Task TestConnectionAsync(string serviceUrl, string username, string password, CancellationToken cancellationToken = default)
+    {
+        using var client = CreateClient(username, password);
+        using var response = await client.GetAsync(BuildServiceUri(serviceUrl), cancellationToken);
+        response.EnsureSuccessStatusCode();
+    }
+
+    public async Task<List<string>> GetEntitySetsAsync(string serviceUrl, string username, string password, CancellationToken cancellationToken = default)
+    {
+        using var client = CreateClient(username, password);
+        var baseUrl = BuildServiceUri(serviceUrl);
+
+        var entitySets = await TryReadEntitySetsFromServiceRootAsync(client, baseUrl, cancellationToken);
+        if (entitySets.Count > 0)
+            return entitySets;
+
+        return await ReadEntitySetsFromMetadataAsync(client, baseUrl, cancellationToken);
+    }
+
+    public async Task<List<Dictionary<string, object?>>> GetEntityRowsAsync(string serviceUrl, string entitySet, string username, string password, CancellationToken cancellationToken = default)
+    {
+        using var client = CreateClient(username, password);
+        var requestUrl = $"{BuildServiceUri(serviceUrl)}{entitySet}?$format=json";
+        using var response = await client.GetAsync(requestUrl, cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var json = await response.Content.ReadAsStringAsync(cancellationToken);
+        using var document = JsonDocument.Parse(json);
+        if (!document.RootElement.TryGetProperty("d", out var dNode))
+            return [];
+
+        if (!dNode.TryGetProperty("results", out var resultsNode) || resultsNode.ValueKind != JsonValueKind.Array)
+            return [];
+
+        var rows = new List<Dictionary<string, object?>>();
+        foreach (var item in resultsNode.EnumerateArray())
+        {
+            var row = new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase);
+            foreach (var property in item.EnumerateObject())
+            {
+                row[property.Name] = ConvertJsonValue(property.Value);
+            }
+
+            rows.Add(row);
+        }
+
+        return rows;
+    }
+
+    private static HttpClient CreateClient(string username, string password)
+    {
+        var client = new HttpClient();
+        client.Timeout = TimeSpan.FromSeconds(15);
+        client.DefaultRequestHeaders.Accept.Clear();
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/atomsvc+xml"));
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
+            "Basic",
+            Convert.ToBase64String(Encoding.UTF8.GetBytes($"{username}:{password}")));
+        return client;
+    }
+
+    private static string BuildServiceUri(string serviceUrl)
+    {
+        var trimmed = serviceUrl.Trim();
+        if (string.IsNullOrWhiteSpace(trimmed))
+            throw new InvalidOperationException("SAP Service URL darf nicht leer sein.");
+
+        var entityPathMarker = "/sap/opu/odata/sap/";
+        var markerIndex = trimmed.IndexOf(entityPathMarker, StringComparison.OrdinalIgnoreCase);
+        if (markerIndex >= 0)
+        {
+            var servicePath = trimmed[(markerIndex + entityPathMarker.Length)..].Trim('/');
+            var parts = servicePath.Split('/', StringSplitOptions.RemoveEmptyEntries);
+            if (parts.Length > 1)
+            {
+                trimmed = $"{trimmed[..(markerIndex + entityPathMarker.Length)]}{parts[0]}/";
+            }
+        }
+
+        return trimmed.EndsWith('/') ? trimmed : $"{trimmed}/";
+    }
+
+    private static async Task<List<string>> TryReadEntitySetsFromServiceRootAsync(HttpClient client, string baseUrl, CancellationToken cancellationToken)
+    {
+        using var response = await client.GetAsync(baseUrl, cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var xml = await response.Content.ReadAsStringAsync(cancellationToken);
+        var document = XDocument.Parse(xml);
+
+        return document
+            .Descendants(AppNs + "collection")
+            .Select(x => x.Attribute("href")?.Value ?? string.Empty)
+            .Where(x => !string.IsNullOrWhiteSpace(x))
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .OrderBy(x => x, StringComparer.OrdinalIgnoreCase)
+            .ToList();
+    }
+
+    private static async Task<List<string>> ReadEntitySetsFromMetadataAsync(HttpClient client, string baseUrl, CancellationToken cancellationToken)
+    {
+        using var response = await client.GetAsync($"{baseUrl}$metadata", cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var xml = await response.Content.ReadAsStringAsync(cancellationToken);
+        var document = XDocument.Parse(xml);
+
+        return document
+            .Descendants(EdmNs + "EntitySet")
+            .Select(x => x.Attribute("Name")?.Value ?? string.Empty)
+            .Where(x => !string.IsNullOrWhiteSpace(x))
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .OrderBy(x => x, StringComparer.OrdinalIgnoreCase)
+            .ToList();
+    }
+
+    private static object? ConvertJsonValue(JsonElement element) => element.ValueKind switch
+    {
+        JsonValueKind.String => element.GetString(),
+        JsonValueKind.Number => element.ToString(),
+        JsonValueKind.True => true,
+        JsonValueKind.False => false,
+        JsonValueKind.Null => null,
+        _ => element.ToString()
+    };
+}
@@ -9,6 +9,7 @@ public class SiteExportService : ISiteExportService
 {
    private readonly IDbContextFactory<AppDbContext> _dbFactory;
    private readonly IHanaQueryService _hanaService;
+    private readonly ISapGatewayService _sapGatewayService;
    private readonly IExcelExportService _excelService;
    private readonly ISharePointUploadService _sharePointService;
    private readonly IRecordTransformationService _transformationService;
@@ -17,6 +18,7 @@ public class SiteExportService : ISiteExportService
    public SiteExportService(
        IDbContextFactory<AppDbContext> dbFactory,
        IHanaQueryService hanaService,
+        ISapGatewayService sapGatewayService,
        IExcelExportService excelService,
        ISharePointUploadService sharePointService,
        IRecordTransformationService transformationService,
@@ -24,6 +26,7 @@ public class SiteExportService : ISiteExportService
    {
        _dbFactory = dbFactory;
        _hanaService = hanaService;
+        _sapGatewayService = sapGatewayService;
        _excelService = excelService;
        _sharePointService = sharePointService;
        _transformationService = transformationService;
@@ -32,9 +35,6 @@ public class SiteExportService : ISiteExportService

    public async Task<SiteExportResult> ExportAsync(Site site, Action<string>? updateStatus = null)
    {
-        if (site.HanaServer is null)
-            throw new InvalidOperationException($"Standort '{site.Land}' hat keinen HANA-Server.");
-
        var sw = Stopwatch.StartNew();
        var log = new ExportLog
        {
@@ -49,22 +49,44 @@ public class SiteExportService : ISiteExportService
            using var db = await _dbFactory.CreateDbContextAsync();
            var settings = await db.ExportSettings.FirstOrDefaultAsync() ?? new ExportSettings();
            var spConfig = await db.SharePointConfigs.FirstOrDefaultAsync();
-            var exportServer = BuildEffectiveServer(site, settings);
-
-            updateStatus?.Invoke("HANA Abfrage...");
-            var records = await Task.Run(() => _hanaService.GetSalesRecords(
-                exportServer, site.Schema, site.TSC, site.Land, settings.DateFilter));
-
-            updateStatus?.Invoke("Transformationen anwenden...");
-            var rules = await db.FieldTransformationRules
-                .Where(r => r.IsActive && r.SourceSystem == (string.IsNullOrWhiteSpace(site.SourceSystem) ? "SAP" : site.SourceSystem))
-                .OrderBy(r => r.SortOrder)
-                .ToListAsync();
-            _transformationService.Apply(records, rules);
-
-            updateStatus?.Invoke("Excel erstellen...");
            var outputDir = Path.Combine(AppContext.BaseDirectory, "output");
-            var filePath = _excelService.CreateExcelFile(outputDir, site.TSC, DateTime.UtcNow.Date, records);
+            var sourceSystem = NormalizeSourceSystem(site.SourceSystem);
+            var records = new List<SalesRecord>();
+            string filePath;
+
+            if (sourceSystem == "SAP")
+            {
+                var credentials = ResolveCredentials(site, settings, sourceSystem);
+                if (string.IsNullOrWhiteSpace(site.SapServiceUrl))
+                    throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP Service URL.");
+                if (string.IsNullOrWhiteSpace(site.SapEntitySet))
+                    throw new InvalidOperationException($"Standort '{site.Land}' hat kein SAP Entity Set ausgewählt.");
+
+                updateStatus?.Invoke("SAP Gateway Abfrage...");
+                var rows = await _sapGatewayService.GetEntityRowsAsync(site.SapServiceUrl, site.SapEntitySet, credentials.Username, credentials.Password);
+                updateStatus?.Invoke("Excel erstellen...");
+                filePath = _excelService.CreateGenericExcelFile(outputDir, $"SAP_{site.TSC}_{site.SapEntitySet}", DateTime.UtcNow.Date, site.SapEntitySet, rows);
+                log.RowCount = rows.Count;
+            }
+            else
+            {
+                var exportServer = BuildEffectiveServer(site, settings, sourceSystem);
+                updateStatus?.Invoke("HANA Abfrage...");
+                records = await Task.Run(() => _hanaService.GetSalesRecords(
+                    exportServer, site.Schema, site.TSC, site.Land, settings.DateFilter));
+
+                updateStatus?.Invoke("Transformationen anwenden...");
+                var rules = await db.FieldTransformationRules
+                    .Where(r => r.IsActive && r.SourceSystem == sourceSystem)
+                    .OrderBy(r => r.SortOrder)
+                    .ToListAsync();
+                _transformationService.Apply(records, rules);
+
+                updateStatus?.Invoke("Excel erstellen...");
+                filePath = _excelService.CreateExcelFile(outputDir, site.TSC, DateTime.UtcNow.Date, records);
+                log.RowCount = records.Count;
+            }
+
            var fileName = Path.GetFileName(filePath);

            if (spConfig is not null &&
@@ -80,12 +102,11 @@ public class SiteExportService : ISiteExportService

            sw.Stop();
            log.Status = "OK";
-            log.RowCount = records.Count;
            log.FileName = fileName;
            log.DurationSeconds = sw.Elapsed.TotalSeconds;

            _logger.LogInformation("Export OK: {Land} ({TSC}) - {Rows} Zeilen in {Duration:F1}s",
-                site.Land, site.TSC, records.Count, sw.Elapsed.TotalSeconds);
+                site.Land, site.TSC, log.RowCount, sw.Elapsed.TotalSeconds);

            return new SiteExportResult
            {
@@ -113,14 +134,12 @@ public class SiteExportService : ISiteExportService
        }
    }

-    private static HanaServer BuildEffectiveServer(Site site, ExportSettings settings)
+    private static HanaServer BuildEffectiveServer(Site site, ExportSettings settings, string sourceSystem)
    {
        if (site.HanaServer is null)
            throw new InvalidOperationException($"Standort '{site.Land}' hat keinen HANA-Server.");

-        var sourceSystem = string.IsNullOrWhiteSpace(site.SourceSystem) ? "SAP" : site.SourceSystem.Trim().ToUpperInvariant();
-        var inheritedUsername = GetCentralUsername(sourceSystem, settings);
-        var inheritedPassword = GetCentralPassword(sourceSystem, settings);
+        var credentials = ResolveCredentials(site, settings, sourceSystem);

        return new HanaServer
        {
@@ -128,8 +147,8 @@ public class SiteExportService : ISiteExportService
            Name = site.HanaServer.Name,
            Host = site.HanaServer.Host,
            Port = site.HanaServer.Port,
-            Username = FirstNonEmpty(site.UsernameOverride, inheritedUsername, site.HanaServer.Username),
-            Password = FirstNonEmpty(site.PasswordOverride, inheritedPassword, site.HanaServer.Password),
+            Username = FirstNonEmpty(credentials.Username, site.HanaServer.Username),
+            Password = FirstNonEmpty(credentials.Password, site.HanaServer.Password),
            DatabaseName = site.HanaServer.DatabaseName,
            UseSsl = site.HanaServer.UseSsl,
            ValidateCertificate = site.HanaServer.ValidateCertificate,
@@ -137,6 +156,10 @@ public class SiteExportService : ISiteExportService
        };
    }

+    private static (string Username, string Password) ResolveCredentials(Site site, ExportSettings settings, string sourceSystem)
+        => (FirstNonEmpty(site.UsernameOverride, GetCentralUsername(sourceSystem, settings)),
+            FirstNonEmpty(site.PasswordOverride, GetCentralPassword(sourceSystem, settings)));
+
    private static string GetCentralUsername(string sourceSystem, ExportSettings settings) => sourceSystem switch
    {
        "BI1" => settings.Bi1Username,
@@ -151,6 +174,9 @@ public class SiteExportService : ISiteExportService
        _ => settings.SapPassword
    };

+    private static string NormalizeSourceSystem(string? sourceSystem)
+        => string.IsNullOrWhiteSpace(sourceSystem) ? "SAP" : sourceSystem.Trim().ToUpperInvariant();
+
    private static string FirstNonEmpty(params string[] values)
    {
        foreach (var value in values)