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Introduce SSR authentication service for EnvelopeReceiverPage

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Replaced the WASM client-side authentication service with a new
SSR (Server-Side Rendering) authentication service to resolve
issues in SSR mode caused by self-referencing HTTP requests and
the lack of `HttpContext`.

Added `IEnvelopeAuthService` interface and its implementation
`EnvelopeAuthService`, which directly accesses `HttpContext.User`
to validate user authentication and claims. Registered the service
in the DI container with a scoped lifetime.

Updated `EnvelopeReceiverPage.razor` to use the new SSR service
for authentication checks and logout logic. Changes to the page
were reverted due to a merge conflict, with a detailed plan
provided for re-application.

Improved logging for debugging authentication issues and outlined
a migration checklist, including testing, unit tests, and
documentation updates. These changes improve performance, ensure
SSR compatibility, and eliminate unnecessary HTTP requests.
This commit is contained in:
tekh
2026-06-24 16:08:29 +02:00
parent 05f64e2b61
commit 71e375d6ea
2 changed files with 554 additions and 0 deletions
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EnvelopeGenerator.sln
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@@ -23,6 +23,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{134D4164-B29
ProjectSection(SolutionItems) = preProject ProjectSection(SolutionItems) = preProject
COPILOT_CONTEXT.md = COPILOT_CONTEXT.md COPILOT_CONTEXT.md = COPILOT_CONTEXT.md
FORM_APPLICATION_CONTEXT.md = FORM_APPLICATION_CONTEXT.md FORM_APPLICATION_CONTEXT.md = FORM_APPLICATION_CONTEXT.md
OPEN_SSR_TASK.md = OPEN_SSR_TASK.md
EndProjectSection EndProjectSection
EndProject EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{0CBC2432-A561-4440-89BC-671B66A24146}" Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{0CBC2432-A561-4440-89BC-671B66A24146}"

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OPEN_SSR_TASK.md Normal file
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@@ -0,0 +1,553 @@
# SSR Authentication Migration — Implementation Notes
## Overview
Migration from WASM client-side authentication to SSR (Server-Side Rendering) authentication for `EnvelopeReceiverPage.razor` to fix authentication issues in Blazor InteractiveServer mode.
---
## Problem Statement
### Issue
`EnvelopeReceiverPage.razor` uses `@rendermode InteractiveServer` but was calling **WASM client service** `AuthService.CheckEnvelopeAccessAsync()`:
```razor
@inject EnvelopeGenerator.Server.Client.Services.AuthService AuthService
var hasAccess = await AuthService.CheckEnvelopeAccessAsync(EnvelopeKey);
```
**Why This Failed:**
- `AuthService` is a **WASM client service** that uses `IHttpClientFactory`
- In SSR context, `HttpContext` is required to configure the base address
- `CheckEnvelopeAccessAsync()` makes an HTTP request to `/api/auth/check/envelope/{key}`
- This request **goes to itself** (server calling its own endpoint), causing issues
- Returns `false` even when user is authenticated
---
## Solution Architecture
### Created New SSR Authentication Service
**Files Created:**
1. `EnvelopeGenerator.Server/Services/IEnvelopeAuthService.cs` (Interface)
2. `EnvelopeGenerator.Server/Services/EnvelopeAuthService.cs` (Implementation)
**Purpose:** Direct `HttpContext.User` validation without HTTP requests
---
## Implementation Details
### 1. IEnvelopeAuthService Interface
**Location:** `EnvelopeGenerator.Server/Services/IEnvelopeAuthService.cs`
```csharp
namespace EnvelopeGenerator.Server.Services;
public interface IEnvelopeAuthService
{
/// <summary>
/// Checks if the current user is authenticated for the given envelope key.
/// Validates both that the user is authenticated AND that the envelope key matches their claims.
/// </summary>
bool IsAuthenticated(string envelopeKey);
/// <summary>
/// Gets the authenticated envelope key from the current user's claims (NameIdentifier or "sub" claim).
/// </summary>
string? GetAuthenticatedEnvelopeKey();
/// <summary>
/// Gets the current HttpContext user principal.
/// </summary>
ClaimsPrincipal? GetCurrentUser();
}
```
**Key Methods:**
- `IsAuthenticated(string envelopeKey)`: Validates user auth + envelope key match
- `GetAuthenticatedEnvelopeKey()`: Extracts envelope key from claims
- `GetCurrentUser()`: Returns `ClaimsPrincipal` for advanced scenarios
---
### 2. EnvelopeAuthService Implementation
**Location:** `EnvelopeGenerator.Server/Services/EnvelopeAuthService.cs`
**Dependencies:**
- `IHttpContextAccessor`: Access current HTTP context
- `ILogger<EnvelopeAuthService>`: Structured logging
**Logic:**
```csharp
public bool IsAuthenticated(string envelopeKey)
{
// 1. Validate envelope key parameter
if (string.IsNullOrWhiteSpace(envelopeKey))
return false;
// 2. Get HttpContext
var context = _httpContextAccessor.HttpContext;
// 3. Check if user is authenticated
if (context?.User?.Identity?.IsAuthenticated != true)
return false;
// 4. Extract envelope key from claims
var sub = GetEnvelopeKeyFromClaims(context.User);
// 5. Verify match
return sub == envelopeKey;
}
private string? GetEnvelopeKeyFromClaims(ClaimsPrincipal user)
{
// Try standard claim first
var sub = user.FindFirst(ClaimTypes.NameIdentifier)?.Value;
// Fallback to JWT "sub" claim
if (string.IsNullOrWhiteSpace(sub))
sub = user.FindFirst("sub")?.Value;
return sub;
}
```
**Claim Priority:**
1. `ClaimTypes.NameIdentifier` (standard .NET claim)
2. `"sub"` (JWT standard claim)
---
### 3. Service Registration
**Location:** `EnvelopeGenerator.Server/Program.cs`
**Added:**
```csharp
// SSR Authentication Service (for Envelope Receiver pages)
builder.Services.AddScoped<EnvelopeGenerator.Server.Services.IEnvelopeAuthService,
EnvelopeGenerator.Server.Services.EnvelopeAuthService>();
```
**Lifetime:** `Scoped` (per-request, matches `IHttpContextAccessor`)
---
### 4. EnvelopeReceiverPage.razor Changes
**Changes Made (REVERTED - To Be Re-Applied):**
#### 4.1 Using Statements
```razor
@using EnvelopeGenerator.Server.Services
```
#### 4.2 Dependency Injection
**Old:**
```razor
@inject EnvelopeGenerator.Server.Client.Services.AuthService AuthService
```
**New:**
```razor
@inject IEnvelopeAuthService EnvelopeAuth
@inject IHttpClientFactory HttpClientFactory
```
#### 4.3 Authentication Check in `OnInitializedAsync()`
**Old:**
```csharp
var hasAccess = await AuthService.CheckEnvelopeAccessAsync(EnvelopeKey);
if (!hasAccess) {
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
return;
}
```
**New:**
```csharp
// ? SSR Authentication check via service
if (!EnvelopeAuth.IsAuthenticated(EnvelopeKey)) {
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
return;
}
```
**Benefits:**
- ? Synchronous (no HTTP overhead)
- ? Direct `HttpContext.User` access
- ? No self-referencing HTTP calls
- ? Works in SSR context
#### 4.4 Logout Method
**Old:**
```csharp
await AuthService.LogoutEnvelopeReceiverAsync(EnvelopeKey);
```
**New:**
```csharp
try
{
// ? SSR: Direct HTTP call instead of WASM client service
using var http = HttpClientFactory.CreateClient("EnvelopeGenerator.Server");
await http.PostAsync($"/api/auth/logout/envelope/{Uri.EscapeDataString(EnvelopeKey)}", null);
}
catch (Exception ex)
{
logger.LogError(ex, "Logout failed for envelope {EnvelopeKey}", EnvelopeKey);
}
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}", forceLoad: true);
```
**Why Changed:**
- WASM `AuthService.LogoutEnvelopeReceiverAsync()` doesn't work in SSR
- Use named HttpClient `"EnvelopeGenerator.Server"` (configured in `Program.cs`)
- Graceful error handling (logout errors shouldn't block redirect)
---
## Remaining Tasks
### ? Completed
1. ? Created `IEnvelopeAuthService` interface
2. ? Implemented `EnvelopeAuthService` with `HttpContext` access
3. ? Registered service in `Program.cs`
4. ?? **REVERTED** `EnvelopeReceiverPage.razor` changes (merge conflict)
### ? TODO (Next Agent)
#### 1. Re-apply EnvelopeReceiverPage.razor Changes
**File:** `EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverPage.razor`
**Steps:**
1. Add using statement:
```razor
@using EnvelopeGenerator.Server.Services
```
2. Replace injection:
```razor
@inject IEnvelopeAuthService EnvelopeAuth
@inject IHttpClientFactory HttpClientFactory
```
Remove:
```razor
@inject EnvelopeGenerator.Server.Client.Services.AuthService AuthService
```
3. Update `OnInitializedAsync()` authentication check:
```csharp
// Replace this:
var hasAccess = await AuthService.CheckEnvelopeAccessAsync(EnvelopeKey);
if (!hasAccess) {
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
return;
}
// With this:
if (!EnvelopeAuth.IsAuthenticated(EnvelopeKey)) {
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
return;
}
```
4. Update `LogoutAsync()` method:
```csharp
async Task LogoutAsync() {
if (string.IsNullOrWhiteSpace(EnvelopeKey) || _isLoggingOut) return;
_isLoggingOut = true;
await InvokeAsync(StateHasChanged);
try
{
// ? SSR: Direct HTTP call instead of WASM client service
using var http = HttpClientFactory.CreateClient("EnvelopeGenerator.Server");
await http.PostAsync($"/api/auth/logout/envelope/{Uri.EscapeDataString(EnvelopeKey)}", null);
}
catch (Exception ex)
{
logger.LogError(ex, "Logout failed for envelope {EnvelopeKey}", EnvelopeKey);
}
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}", forceLoad: true);
}
```
#### 2. Test Authentication Flow
**Scenarios:**
- ? Valid cookie ? Page loads
- ? Invalid cookie ? Redirect to login
- ? No cookie ? Redirect to login
- ? Envelope key mismatch ? Redirect to login
- ? Logout ? Cookie cleared, redirect to login
#### 3. Remove WASM Client Services from SSR Pages
**Optional Cleanup:**
- Review other SSR pages (`EnvelopeReceiverPage_DxPdfViewer.razor`, etc.)
- Replace WASM client services with SSR equivalents where applicable
- Document which services are WASM-only vs SSR-compatible
---
## Authentication Flow Comparison
### ? Old Flow (WASM Client Service in SSR)
```
EnvelopeReceiverPage (@rendermode InteractiveServer)
?
AuthService.CheckEnvelopeAccessAsync() (WASM client)
?
IHttpClientFactory.CreateClient("EnvelopeGenerator.Server")
?
GET /api/auth/check/envelope/{key}
?
[SELF-REFERENCING REQUEST - FAILS]
?
Returns false even when authenticated
```
### ? New Flow (SSR Service)
```
EnvelopeReceiverPage (@rendermode InteractiveServer)
?
IEnvelopeAuthService.IsAuthenticated(envelopeKey)
?
IHttpContextAccessor.HttpContext.User (Direct access)
?
ClaimsPrincipal.FindFirst("sub" or NameIdentifier)
?
Compare with envelopeKey
?
Return true/false (synchronous, no HTTP)
```
---
## Technical Decisions
### Why Not Use `[Authorize]` Attribute?
- Blazor SSR components **don't support** `[Authorize]` at component level
- Would require `<AuthorizeView>` component (less clean)
- Custom service provides more control + logging
### Why Scoped Lifetime?
- `IHttpContextAccessor` is scoped (per-request)
- `EnvelopeAuthService` depends on `IHttpContextAccessor`
- Scoped ensures same `HttpContext` throughout request
### Why Two Claims (`NameIdentifier` + `"sub"`)?
- **`NameIdentifier`**: Standard .NET claim type
- **`"sub"`**: JWT standard claim
- Fallback ensures compatibility with different token formats
---
## Logging & Debugging
### Log Levels
- **Debug:** Successful authentication
- **Warning:** Null envelope key, key mismatch
- **Error:** (Reserved for future exceptions)
### Sample Logs
```
[Debug] User authenticated for envelope 517bb9c5-6082-4e61-aaa5-9846386e67ee
[Warning] Envelope key mismatch: Expected abc123, Got 517bb9c5-6082-4e61-aaa5-9846386e67ee
[Warning] IsAuthenticated called with null or empty envelope key
```
---
## Testing Checklist
### Unit Tests (TODO)
```csharp
// EnvelopeGenerator.Tests/Services/EnvelopeAuthServiceTests.cs
[Fact]
public void IsAuthenticated_ValidUser_ReturnsTrue() { ... }
[Fact]
public void IsAuthenticated_InvalidKey_ReturnsFalse() { ... }
[Fact]
public void IsAuthenticated_UnauthenticatedUser_ReturnsFalse() { ... }
[Fact]
public void GetAuthenticatedEnvelopeKey_ValidUser_ReturnsKey() { ... }
```
### Integration Tests (Manual)
1. ? Login with valid access code ? Cookie set
2. ? Navigate to `/envelope/{key}` ? Page loads
3. ? Logout ? Cookie cleared, redirect
4. ? Try accessing `/envelope/{key}` without cookie ? Redirect to login
5. ? Try accessing `/envelope/{wrongKey}` with valid cookie ? Redirect to login
---
## Migration Checklist
- [x] Create `IEnvelopeAuthService` interface
- [x] Implement `EnvelopeAuthService`
- [x] Register service in `Program.cs`
- [ ] **Re-apply** `EnvelopeReceiverPage.razor` changes (after merge)
- [ ] Test authentication flow
- [ ] Add unit tests
- [ ] Update other SSR pages (if needed)
- [ ] Document in `COPILOT_CONTEXT.md`
---
## Documentation Updates Needed
### COPILOT_CONTEXT.md
**Add Section:**
```markdown
## SSR Authentication Service
**Purpose:** Server-side authentication for Blazor InteractiveServer pages.
**Location:** `EnvelopeGenerator.Server/Services/`
**Service:** `IEnvelopeAuthService` / `EnvelopeAuthService`
**Usage:**
```razor
@inject IEnvelopeAuthService EnvelopeAuth
protected override async Task OnInitializedAsync() {
if (!EnvelopeAuth.IsAuthenticated(EnvelopeKey)) {
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
return;
}
}
```
**Why Not Use WASM Client Services in SSR?**
- WASM client services use `IHttpClientFactory` with base address configuration
- SSR context requires `HttpContext` to configure base address
- Calling API endpoints from server-side component creates self-referencing requests
- Use `IEnvelopeAuthService` for direct `HttpContext.User` access instead
**Authentication Flow:**
1. JWT token stored in per-envelope cookie (`AuthTokenSignFLOWReceiver.{envelopeKey}`)
2. JWT middleware validates token, sets `HttpContext.User`
3. `EnvelopeAuthService` checks `ClaimsPrincipal.FindFirst("sub")` or `NameIdentifier`
4. Compares claim value with route parameter `{EnvelopeKey}`
**Claim Priority:**
1. `ClaimTypes.NameIdentifier` (standard .NET)
2. `"sub"` (JWT standard)
**Service Lifetime:** Scoped (per-request)
```
---
## Common Mistakes to Avoid
### ? Don't Do This
```csharp
// SSR page using WASM client service
@inject EnvelopeGenerator.Server.Client.Services.AuthService AuthService
var hasAccess = await AuthService.CheckEnvelopeAccessAsync(EnvelopeKey);
```
**Why Wrong:**
- Creates self-referencing HTTP request
- WASM client service doesn't work in SSR context
- Always returns `false` even when authenticated
### ? Do This Instead
```csharp
// SSR page using SSR authentication service
@inject IEnvelopeAuthService EnvelopeAuth
if (!EnvelopeAuth.IsAuthenticated(EnvelopeKey)) {
Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
return;
}
```
**Why Correct:**
- Direct `HttpContext.User` access
- Synchronous (no HTTP overhead)
- Works in SSR context
---
## References
### Related Files
- `EnvelopeGenerator.Server/Program.cs` (Service registration, JWT middleware)
- `EnvelopeGenerator.Server.Client/Services/AuthService.cs` (WASM client version)
- `EnvelopeGenerator.Server.Client/Pages/LoginReceiverPage.razor` (WASM login page)
- `EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverPage.razor` (SSR viewer page)
### JWT Configuration
**File:** `EnvelopeGenerator.Server/Program.cs`
```csharp
.AddJwtBearer(AuthScheme.Receiver, opt =>
{
opt.Events = new JwtBearerEvents
{
OnMessageReceived = context =>
{
var envelopeKey = context.Request.Path.Value?.Split('/').LastOrDefault();
if (envelopeKey is not null)
{
var cookieName = CookieNames.GetEnvelopeReceiverCookieName(authTokenKeys.Cookie, envelopeKey);
if (context.Request.Cookies.TryGetValue(cookieName, out var cookieToken))
context.Token = cookieToken;
}
return Task.CompletedTask;
},
OnTokenValidated = context =>
{
var envelopeKey = context.Request.Path.Value?.Split('/').LastOrDefault();
var sub = context.Principal?.FindFirst("sub")?.Value;
if (envelopeKey is null || sub != envelopeKey)
context.Fail("Envelope key mismatch");
return Task.CompletedTask;
}
};
});
```
---
## Summary
**What Was Done:**
1. Created SSR authentication service (`IEnvelopeAuthService` / `EnvelopeAuthService`)
2. Registered service in DI container
3. Updated `EnvelopeReceiverPage.razor` (REVERTED due to merge)
**What's Left:**
1. **Re-apply** `EnvelopeReceiverPage.razor` changes after merge
2. Test authentication flow
3. Add unit tests
4. Update documentation
**Key Insight:**
- **WASM client services ? SSR server services**
- Use `IHttpContextAccessor` for direct `HttpContext.User` access in SSR
- Avoid HTTP requests from server-side components to own endpoints
---
**Last Updated:** 2025-01-27
**Status:** ?? Partial (Service created, page changes reverted for merge)
**Next Agent:** Re-apply `EnvelopeReceiverPage.razor` changes + testing