update login and logout

Elsa.Studio.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 18
-VisualStudioVersion = 18.2.11408.102 d18.0
+VisualStudioVersion = 18.2.11408.102
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{875A7E2E-4B7C-4AF0-A71E-3980B73AF363}"
 	ProjectSection(SolutionItems) = preProject

IMPLEMENTATION_SUMMARY.md

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+# Elsa Studio Hosting Components - Implementation Summary
+
+## Problem Statement
+There was a lot of repetitive code in host application HTML, CSHTML, and JavaScript files that wasn't transferrable to other Elsa Studio host applications. Integrators had to copy and paste all the boilerplate code to set up a new host.
+
+## Solution
+Created complete, reusable single-script loaders in the `Elsa.Studio.Shared` project that handle EVERYTHING - CSS, JavaScript, loading screen, and initialization.
+
+## What Was Created
+
+### 1. Complete Single-Script Loaders
+**Location:** `src/framework/Elsa.Studio.Shared/wwwroot/js/`
+
+Three comprehensive loaders that dynamically inject all dependencies:
+
+**elsa-studio-loader-server.js** - For Blazor Server
+- Dynamically injects all required CSS links (MudBlazor, Radzen, Elsa Studio Shell, Workflows Designer)
+- Dynamically loads all JavaScript libraries (BlazorMonaco, MudBlazor, Radzen, etc.)
+- Creates and injects loading screen HTML and CSS
+- Initializes Blazor Server with 10-second timeout fallback
+- Exposes `ElsaStudio.hideLoading()` API
+
+**elsa-studio-loader-wasm.js** - For Blazor WebAssembly
+- Dynamically injects all required CSS links
+- Dynamically loads all JavaScript libraries including WebAssembly authentication
+- Creates and injects loading screen HTML and CSS
+- Initializes Blazor WASM with safety timeout
+- Handles script loading order and dependencies
+
+**elsa-studio-loader-hosted-wasm.js** - For Hosted WebAssembly
+- All features of WASM loader
+- Custom `loadBootResource` configuration for multi-tenant scenarios
+- Dynamic base path resolution support
+
+### 2. Optional Standalone CSS
+**Location:** `src/framework/Elsa.Studio.Shared/wwwroot/css/elsa-loading.css`
+
+Standalone CSS file for the loading screen (optional, as loaders inject inline styles).
+
+### 3. Razor Components (For Pure Blazor)
+**Location:** `src/framework/Elsa.Studio.Shared/Components/Hosting/`
+
+These remain available for use in pure Blazor components:
+- `ElsaStudioHead.razor`
+- `ElsaStudioScripts.razor`
+- `ElsaStudioLoadingScreen.razor`
+- `ElsaStudioInitScript.razor`
+- `BlazorHostingMode.cs`
+
+### 4. Comprehensive Documentation
+**Location:** `src/framework/Elsa.Studio.Shared/Components/Hosting/README.md`
+
+Complete integration guide with minimal examples for all scenarios.
+
+## Changes to Host Projects
+
+### Before (Repetitive Pattern)
+Each host had ~50-60 lines of boilerplate:
+- 5-7 CSS `<link>` tags
+- 7-8 JavaScript `<script>` tags  
+- 12 lines of loading screen HTML
+- 8 lines of CSS animation
+- 10-20 lines of initialization JavaScript
+
+### After (Minimal Pattern)
+Each host now has just **1 line**:
+```html
+<script src="_content/Elsa.Studio.Shared/js/elsa-studio-loader-[mode].js"></script>
+```
+
+### Updated Files
+1. **Elsa.Studio.Host.Server** - `Pages/_Host.cshtml`
+   - Removed all CSS links
+   - Removed all script tags
+   - Removed loading screen HTML and CSS
+   - Removed initialization JavaScript
+   - Added single loader script: `elsa-studio-loader-server.js`
+
+2. **Elsa.Studio.Host.Wasm** - `wwwroot/index.html`
+   - Removed all CSS links
+   - Removed all script tags
+   - Removed loading screen HTML and CSS
+   - Removed initialization JavaScript
+   - Added single loader script: `elsa-studio-loader-wasm.js`
+
+3. **Elsa.Studio.Host.HostedWasm** - `Pages/_Host.cshtml`
+   - Removed all CSS links
+   - Removed all script tags
+   - Removed loading screen HTML and CSS
+   - Removed initialization JavaScript
+   - Added single loader script: `elsa-studio-loader-hosted-wasm.js`
+   - Kept `window.getClientConfig` for API URL injection
+
+## Benefits
+
+### For Integrators
+✅ **Truly Minimal** - Just 1 script tag, that's it!
+✅ **Zero Boilerplate** - No CSS, HTML, or JavaScript to maintain
+✅ **Copy-Paste Ready** - Documentation provides complete working examples
+✅ **No Duplication** - All initialization logic centralized
+✅ **Consistent** - Same UI and behavior across all integration scenarios
+
+### For Maintenance
+✅ **Single Source of Truth** - Update once in loader, applies everywhere
+✅ **Packaged** - Delivered via Elsa.Studio.Shared NuGet package
+✅ **Testable** - Centralized code is easier to test
+✅ **Documented** - Clear examples for all scenarios
+✅ **Future-Proof** - Add new dependencies in loader, all hosts get them automatically
+
+### Code Reduction
+- **~97% reduction** per host (from ~50 lines to 1 line)
+- **0 lines** of boilerplate to maintain in each host
+- **3 reusable** loader scripts covering all scenarios
+
+## Integration Examples
+
+### Minimal Blazor Server Host
+
+```cshtml
+@page "/"
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <base href="~/" />
+    <title>Elsa Studio</title>
+    <component type="typeof(HeadOutlet)" render-mode="Server" />
+</head>
+<body>
+    <component type="typeof(App)" render-mode="Server" />
+
+    <div id="blazor-error-ui">
+        An error has occurred.
+        <a href="" class="reload">Reload</a>
+        <a class="dismiss">🗙</a>
+    </div>
+
+    <!-- That's it! Everything else is handled by the loader -->
+    <script src="_content/Elsa.Studio.Shared/js/elsa-studio-loader-server.js"></script>
+</body>
+</html>
+```
+
+### Minimal Blazor WASM Host
+
+```html
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <base href="/" />
+    <title>Elsa Studio</title>
+</head>
+<body>
+    <div id="app"></div>
+
+    <div id="blazor-error-ui">
+        An unhandled error has occurred.
+        <a href="" class="reload">Reload</a>
+        <a class="dismiss">🗙</a>
+    </div>
+
+    <!-- That's it! Everything else is handled by the loader -->
+    <script src="_content/Elsa.Studio.Shared/js/elsa-studio-loader-wasm.js"></script>
+</body>
+</html>
+```
+
+## How It Works
+
+The loaders use JavaScript to:
+1. **Dynamically create and inject CSS `<link>` elements** - No need to manually list CSS files
+2. **Dynamically create and inject script `<script>` elements** - No need to manually list JavaScript files
+3. **Generate loading screen HTML** - Injected at runtime into the body
+4. **Add loading screen CSS** - Injected at runtime into the head
+5. **Initialize Blazor** - Automatic startup with appropriate configuration
+6. **Manage loading state** - Hide screen when Blazor is ready
+
+All of this happens automatically when the single loader script runs.
+
+## Testing
+
+- ✅ All host projects build successfully
+- ✅ Server host compiles without errors
+- ✅ WASM host compiles without errors
+- ✅ HostedWasm host compiles without errors
+- ✅ Loaders inject CSS dynamically
+- ✅ Loaders inject scripts dynamically
+- ✅ Loading screens appear and disappear correctly
+- ✅ Blazor initializes properly
+
+## Backward Compatibility
+
+The solution maintains backward compatibility:
+- Original `elsa-studio-init.js` still available
+- Razor components still available for pure Blazor scenarios
+- Legacy function names still work
+- No breaking changes to APIs or contracts
+
+## Next Steps for Integrators
+
+1. Add reference to `Elsa.Studio.Shared` NuGet package
+2. Use one of the minimal integration examples from README
+3. Deploy - everything is handled automatically!
+
+See `src/framework/Elsa.Studio.Shared/Components/Hosting/README.md` for complete documentation.
+
+## Summary
+
+**Problem:** 50+ lines of repetitive boilerplate per host
+**Solution:** Single-script loaders that handle everything
+**Result:** 1 line per host, ~97% code reduction, full reuse achieved

src/framework/Elsa.Studio.Shared/Components/AppBar/LogoutButton.razor

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+<MudIconButton Icon="@Icons.Material.Outlined.Logout" Color="Color.Inherit" Href="/login" Target="_self" Title="Logout"/>

src/framework/Elsa.Studio.Shared/Components/Hosting/BlazorHostingMode.cs

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+namespace Elsa.Studio.Shared.Components.Hosting;
+
+/// <summary>
+/// Represents the Blazor hosting mode.
+/// </summary>
+public enum BlazorHostingMode
+{
+    /// <summary>
+    /// Blazor Server hosting mode.
+    /// </summary>
+    Server,
+
+    /// <summary>
+    /// Blazor WebAssembly hosting mode.
+    /// </summary>
+    WebAssembly
+}

src/framework/Elsa.Studio.Shared/Components/Hosting/ElsaStudioHead.razor

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+@namespace Elsa.Studio.Shared.Components.Hosting
+
+@*
+    Elsa Studio Head Component - Includes all required CSS links.
+    Usage: <ElsaStudioHead />
+*@
+
+<link href="_content/MudBlazor/MudBlazor.min.css" rel="stylesheet" />
+<link href="_content/CodeBeam.MudBlazor.Extensions/MudExtensions.min.css" rel="stylesheet" />
+<link href="_content/Radzen.Blazor/css/material-base.css" rel="stylesheet">
+<link href="_content/Elsa.Studio.Shell/css/shell.css" rel="stylesheet">
+@if (IncludeDesignerCss)
+{
+    <link href="_content/Elsa.Studio.Workflows.Designer/designer.css" rel="stylesheet">
+}
+
+@code {
+    /// <summary>
+    /// Whether to include the Workflow Designer CSS. Default is true.
+    /// </summary>
+    [Parameter]
+    public bool IncludeDesignerCss { get; set; } = true;
+}

src/framework/Elsa.Studio.Shared/Components/Hosting/ElsaStudioInitScript.razor

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+@namespace Elsa.Studio.Shared.Components.Hosting
+
+@*
+    Elsa Studio Initialization Script Component - Includes JavaScript for loading screen and Blazor initialization.
+    Usage: <ElsaStudioInitScript Mode="BlazorHostingMode.Server" />
+*@
+
+<script src="_content/Elsa.Studio.Shared/js/elsa-studio-init.js"></script>
+
+@if (Mode == BlazorHostingMode.Server)
+{
+    <script>
+        ElsaStudio.initializeBlazorServer(@MaxWaitTimeMs);
+    </script>
+}
+else if (Mode == BlazorHostingMode.WebAssembly)
+{
+    <script>
+        // Initialize Blazor WASM when DOM is ready
+        function initializeElsaBlazorWasm() {
+            @if (CustomConfig != null)
+            {
+                @:ElsaStudio.initializeBlazorWasm(@CustomConfig);
+            }
+            else
+            {
+                @:ElsaStudio.initializeBlazorWasm();
+            }
+        }
+
+        if (document.readyState === 'loading') {
+            document.addEventListener('DOMContentLoaded', initializeElsaBlazorWasm);
+        } else {
+            initializeElsaBlazorWasm();
+        }
+
+        // Safety timeout
+        setTimeout(() => {
+            ElsaStudio.hideLoading();
+        }, @SafetyTimeoutMs);
+    </script>
+}
+
+@code {
+    /// <summary>
+    /// The Blazor hosting mode (Server or WebAssembly).
+    /// </summary>
+    [Parameter]
+    public BlazorHostingMode Mode { get; set; } = BlazorHostingMode.Server;
+
+    /// <summary>
+    /// For Server mode: Maximum time (in milliseconds) to wait before hiding loading screen. Default is 10000 (10 seconds).
+    /// </summary>
+    [Parameter]
+    public int MaxWaitTimeMs { get; set; } = 10000;
+
+    /// <summary>
+    /// For WebAssembly mode: Safety timeout (in milliseconds) to ensure loading screen is hidden. Default is 5000 (5 seconds).
+    /// </summary>
+    [Parameter]
+    public int SafetyTimeoutMs { get; set; } = 5000;
+
+    /// <summary>
+    /// For WebAssembly mode: Custom Blazor configuration as a JavaScript object literal. 
+    /// Example: "{ loadBootResource: function(type, name, defaultUri, integrity) { return defaultUri; } }"
+    /// </summary>
+    [Parameter]
+    public string? CustomConfig { get; set; }
+}

src/framework/Elsa.Studio.Shared/Components/Hosting/ElsaStudioLoadingScreen.razor

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+@namespace Elsa.Studio.Shared.Components.Hosting
+
+@*
+    Elsa Studio Loading Screen Component - Shows a loading spinner during initialization.
+    Usage: <ElsaStudioLoadingScreen Id="app-loading" />
+*@
+
+<div id="@Id" style="position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: #f5f5f5; display: flex; justify-content: center; align-items: center; z-index: 9999;">
+    <div style="text-align: center;">
+        <div style="width: 40px; height: 40px; border: 4px solid #e0e0e0; border-top: 4px solid #1976d2; border-radius: 50%; animation: elsa-loading-spin 1s linear infinite; margin: 0 auto 20px;"></div>
+        <div id="@TextId" style="color: #666; font-family: 'Roboto', sans-serif;">@Text</div>
+    </div>
+</div>
+
+<style>
+    @@keyframes elsa-loading-spin {
+        0% { transform: rotate(0deg); }
+        100% { transform: rotate(360deg); }
+    }
+
+    .blazor-ready #@Id {
+        display: none !important;
+    }
+</style>
+
+@code {
+    /// <summary>
+    /// The ID for the loading screen element. Default is "elsa-loading".
+    /// </summary>
+    [Parameter]
+    public string Id { get; set; } = "elsa-loading";
+
+    /// <summary>
+    /// The ID for the loading text element. Default is "elsa-loading-text".
+    /// </summary>
+    [Parameter]
+    public string TextId { get; set; } = "elsa-loading-text";
+
+    /// <summary>
+    /// The initial loading text. Default is "Initializing...".
+    /// </summary>
+    [Parameter]
+    public string Text { get; set; } = "Initializing...";
+}