Add PDF Stamp Operation feature with endpoints and tests
Implemented the "PDF Stamp Operation" feature, allowing users to add text, image, or predefined stamps to PDF documents. - Added `FEATURE_7_PLAN.md` with detailed implementation plan. - Introduced enums (`StampType`, `PredefinedStampType`, `StampPlacement`) in the domain layer. - Added `AddStampAsync` method to `IPdfProcessor` interface. - Implemented `AddStampAsync` in `DevExpressPdfProcessor` using DevExpress API. - Created unit tests for `AddStampAsync` covering various scenarios. - Added `AddStampCommand` in the application layer with validation rules. - Created two new endpoints in `PdfOperationsController` for multipart and Base64 inputs. - Added DTOs for handling endpoint requests. - Wrote integration tests for endpoints to ensure correctness. - Updated `AGENTS.md` and added DevExpress API references. - Documented challenges, considerations, and estimated effort. This commit completes the "PDF Stamp Operation" feature with full test coverage and documentation.
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FEATURE_7_PLAN.md
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FEATURE_7_PLAN.md
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# Feature 7 Plan: PDF Stamp Operation
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## Overview
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**Priority:** Phase 2, Priority 6
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**Endpoint:** `POST /api/pdf/operations/stamp`
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**Purpose:** Add text/image stamps to PDF documents (watermarks, confidential marks, approval stamps)
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---
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## Requirements (from CONTROLLER_ENDPOINTS.md)
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### Endpoint Specification
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- **Route:** `/api/pdf/operations/stamp`
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- **Method:** POST
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- **Input formats:**
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- Multipart/form-data (PDF file + stamp parameters)
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- JSON (Base64-encoded PDF + stamp parameters)
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- **Output:** Stamped PDF file (application/pdf)
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### Stamp Types
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1. **Text Stamp:** Custom text with font, size, color, rotation
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2. **Image Stamp:** PNG/JPEG image overlay
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3. **Predefined Stamps:** "CONFIDENTIAL", "APPROVED", "DRAFT", "VOID" (optional)
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### Stamp Parameters
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- **Position:** X, Y coordinates (with Origin support: BottomLeft/TopLeft)
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- **Size:** Width, Height (optional if using image natural size)
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- **Rotation:** Angle in degrees (0-360)
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- **Opacity:** 0.0 (transparent) to 1.0 (opaque)
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- **Page range:** Single page, multiple pages, or "all pages"
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---
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## Implementation Plan (7 Systematic Commits)
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### Commit 1: Domain Layer
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**File:** `DocumentOperator.Domain/Models/ValueObjects/StampType.cs`
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```csharp
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public enum StampType
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{
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Text,
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Image,
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Predefined
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}
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```
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**File:** `DocumentOperator.Domain/Models/ValueObjects/PredefinedStampType.cs`
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```csharp
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public enum PredefinedStampType
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{
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Confidential,
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Approved,
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Draft,
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Void,
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ForReview
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}
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```
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**File:** `DocumentOperator.Domain/Models/ValueObjects/StampPlacement.cs`
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```csharp
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public enum StampPlacement
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{
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Foreground, // On top of content
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Background // Behind content
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}
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```
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---
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### Commit 2: Infrastructure Interface
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**File:** `DocumentOperator.Application/Common/Interfaces/IPdfProcessor.cs`
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Add method:
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```csharp
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/// <summary>
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/// Adds a stamp (text or image) to specified pages of a PDF document.
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/// </summary>
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Task<byte[]> AddStampAsync(
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Stream pdfStream,
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StampType stampType,
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int[]? pageNumbers, // null = all pages
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(double X, double Y) position,
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(double Width, double Height)? size = null, // null = auto-size for image
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AnnotationOrigin origin = AnnotationOrigin.BottomLeft,
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string? text = null, // Required for Text stamp
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string? fontName = null, // Default: Arial
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double? fontSize = null, // Default: 12
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string? color = null, // Hex color, default: "000000" (black)
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double? opacity = null, // 0.0-1.0, default: 0.5
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double? rotation = null, // Degrees, default: 0
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StampPlacement placement = StampPlacement.Foreground,
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byte[]? imageBytes = null, // Required for Image stamp
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PredefinedStampType? predefinedType = null); // Required for Predefined stamp
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```
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**Validation rules:**
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- `text` required if `stampType == Text`
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- `imageBytes` required if `stampType == Image`
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- `predefinedType` required if `stampType == Predefined`
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- `pageNumbers` can be null (all pages), empty array not allowed
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- `opacity` must be 0.0-1.0
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- `rotation` must be 0-360
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---
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### Commit 3: Infrastructure Implementation
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**File:** `DocumentOperator.Infrastructure/Services/PdfProcessing/DevExpressPdfProcessor.cs`
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**DevExpress API:**
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- Use `PdfGraphics` to draw on page
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- `PdfGraphics.DrawString()` for text stamps
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- `PdfGraphics.DrawImage()` for image stamps
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- Set opacity via `PdfBrush.Color` alpha channel
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- Apply rotation via `PdfGraphics.RotateTransform()`
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**Implementation strategy:**
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1. Load PDF
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2. Validate page numbers against document page count
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3. For each target page:
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- Get `PdfGraphics` from `PdfDocumentProcessor.CreateGraphics()`
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- Convert coordinates if `origin == TopLeft`
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- Apply rotation transform
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- Set opacity via brush alpha
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- Draw text/image
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- Dispose graphics
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4. Save to byte array
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**Private helper methods:**
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- `AddTextStamp(PdfGraphics graphics, ...)`
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- `AddImageStamp(PdfGraphics graphics, byte[] imageBytes, ...)`
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- `AddPredefinedStamp(PdfGraphics graphics, PredefinedStampType type, ...)` (delegates to AddTextStamp with predefined text/style)
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- `CalculatePageNumbers(int totalPages, int[]? requestedPages)` → returns array of zero-based indices
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---
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### Commit 4: Infrastructure Unit Tests
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**File:** `DocumentOperator.Tests/Unit/Infrastructure/Services/PdfProcessing/DevExpressPdfProcessorTests.cs`
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**Tests (10-12):**
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1. `AddStampAsync_TextStampSinglePage_ReturnsStampedPdf`
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2. `AddStampAsync_TextStampAllPages_ReturnsStampedPdf`
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3. `AddStampAsync_ImageStampWithRotation_ReturnsStampedPdf`
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4. `AddStampAsync_PredefinedStampConfidential_ReturnsStampedPdf`
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5. `AddStampAsync_WithOpacity_ReturnsStampedPdf`
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6. `AddStampAsync_TopLeftOrigin_ReturnsStampedPdf`
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7. `AddStampAsync_EmptyStream_ThrowsBadRequestException`
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8. `AddStampAsync_InvalidPageNumber_ThrowsBadRequestException`
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9. `AddStampAsync_TextStampWithoutText_ThrowsBadRequestException`
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10. `AddStampAsync_ImageStampWithoutBytes_ThrowsBadRequestException`
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11. `AddStampAsync_InvalidOpacity_ThrowsBadRequestException`
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12. `AddStampAsync_InvalidRotation_ThrowsBadRequestException`
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---
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### Commit 5: Application Layer
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**File:** `DocumentOperator.Application/AddStamp/AddStampCommand.cs`
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**Command/Handler/Validator merged:**
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```csharp
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public record AddStampCommand : IRequest<byte[]>
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{
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public required Stream PdfStream { get; init; }
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public required StampType StampType { get; init; }
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public int[]? PageNumbers { get; init; } // null = all pages
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public required (double X, double Y) Position { get; init; }
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public (double Width, double Height)? Size { get; init; }
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public AnnotationOrigin Origin { get; init; } = AnnotationOrigin.BottomLeft;
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public string? Text { get; init; }
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public string? FontName { get; init; }
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public double? FontSize { get; init; }
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public string? Color { get; init; }
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public double? Opacity { get; init; }
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public double? Rotation { get; init; }
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public StampPlacement Placement { get; init; } = StampPlacement.Foreground;
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public byte[]? ImageBytes { get; init; }
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public PredefinedStampType? PredefinedType { get; init; }
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}
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```
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**Validator:**
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- Stream not null
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- Text required if StampType == Text
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- ImageBytes required if StampType == Image
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- PredefinedType required if StampType == Predefined
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- Color regex: `^[0-9A-Fa-f]{6}$`
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- Opacity: 0.0-1.0
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- Rotation: 0-360
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- FontSize > 0 if provided
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---
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### Commit 6: API Endpoints + DTOs
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**File:** `DocumentOperator.API/Controllers/PdfOperationsController.cs`
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**Two endpoints:**
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1. **Multipart:** `POST /api/pdf/operations/stamp` (multipart/form-data)
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2. **JSON:** `POST /api/pdf/operations/stamp` (application/json)
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**DTOs:**
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```csharp
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public class AddStampMultipartRequest
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{
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public required IFormFile File { get; set; }
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public required StampType StampType { get; set; }
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public int[]? PageNumbers { get; set; } // Comma-separated in form: "1,3,5"
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public required double X { get; set; }
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public required double Y { get; set; }
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public double? Width { get; set; }
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public double? Height { get; set; }
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public AnnotationOrigin Origin { get; set; } = AnnotationOrigin.BottomLeft;
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public string? Text { get; set; }
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public string? FontName { get; set; }
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public double? FontSize { get; set; }
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public string? Color { get; set; }
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public double? Opacity { get; set; }
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public double? Rotation { get; set; }
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public StampPlacement Placement { get; set; } = StampPlacement.Foreground;
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public IFormFile? ImageFile { get; set; } // Optional image for Image stamp
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public PredefinedStampType? PredefinedType { get; set; }
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}
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public record AddStampBase64Request
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{
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public required string Base64Pdf { get; init; }
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public required StampType StampType { get; init; }
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public int[]? PageNumbers { get; init; }
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public required double X { get; init; }
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public required double Y { get; init; }
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public double? Width { get; init; }
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public double? Height { get; init; }
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public AnnotationOrigin Origin { get; init; } = AnnotationOrigin.BottomLeft;
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public string? Text { get; init; }
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public string? FontName { get; init; }
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public double? FontSize { get; init; }
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public string? Color { get; init; }
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public double? Opacity { get; init; }
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public double? Rotation { get; init; }
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public StampPlacement Placement { get; init; } = StampPlacement.Foreground;
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public string? Base64Image { get; init; } // Base64-encoded image bytes
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public PredefinedStampType? PredefinedType { get; init; }
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}
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```
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**Endpoint names:**
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- `Name = "AddStampFromFile"`
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- `Name = "AddStampFromBase64"`
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---
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### Commit 7: Integration Tests + Documentation
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**File:** `DocumentOperator.Tests/Integration/API/PdfOperationsControllerTests.cs`
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**Tests (8-10):**
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1. `AddStampFromFile_TextStampSinglePage_ReturnsStampedPdf`
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2. `AddStampFromBase64_TextStampAllPages_ReturnsStampedPdf`
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3. `AddStampFromFile_ImageStamp_ReturnsStampedPdf`
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4. `AddStampFromBase64_PredefinedStamp_ReturnsStampedPdf`
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5. `AddStampFromBase64_WithRotationAndOpacity_ReturnsStampedPdf`
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6. `AddStampFromBase64_InvalidBase64_Returns400`
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7. `AddStampFromBase64_TextStampWithoutText_Returns400`
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8. `AddStampFromBase64_ImageStampWithoutImage_Returns400`
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9. `AddStampFromBase64_InvalidPageNumber_Returns400`
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10. `AddStampFromBase64_InvalidOpacity_Returns400`
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**Update AGENTS.md:**
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- Test count: 101 → ~120 passed
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- PdfOperationsController status: 2/3 → 3/3 endpoints (merge + annotate + stamp ALL DONE)
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- Add Feature 7 to test breakdown
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---
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## DevExpress API References
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**Key classes:**
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- `PdfDocumentProcessor.CreateGraphics(int pageIndex)` → `PdfGraphics`
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- `PdfGraphics.DrawString(string text, PdfFont font, PdfBrush brush, RectangleF bounds)`
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- `PdfGraphics.DrawImage(Image image, RectangleF bounds)`
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- `PdfGraphics.RotateTransform(float angle)`
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- `PdfGraphics.SetTransparency(float opacity)` or use `Color.FromArgb(alpha, r, g, b)`
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- `PdfFont.Create(string fontName, float fontSize)`
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- `PdfBrush.Create(Color color)`
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**Coordinate system:**
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- Same as annotations: BottomLeft origin by default
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- Need to convert if user specifies TopLeft
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**Stamp placement:**
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- Foreground: Draw after page content (`CreateGraphics` with `PdfGraphicsContentStreamType.Foreground`)
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- Background: Draw before page content (`CreateGraphics` with `PdfGraphicsContentStreamType.Background`)
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---
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## Potential Challenges
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1. **Image format support:** DevExpress may require specific image formats (PNG, JPEG). Need to validate.
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2. **Font availability:** Custom fonts may not be available on server. Default to Arial.
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3. **Text wrapping:** If text is too long, may overflow stamp bounds. Truncate or wrap?
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4. **Performance:** Adding stamp to all pages of large PDF (500+ pages) may be slow. Consider async/streaming.
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---
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## Estimated Effort
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- **Complexity:** Medium (similar to annotation, but with graphics drawing)
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- **Time:** 4-6 hours (7 commits)
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- **Test coverage:** ~20 tests (12 unit + 10 integration)
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- **Expected test count after completion:** ~120 passed, 7 skipped
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---
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## Success Criteria
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✅ All 7 commits completed systematically
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✅ Build: 0 errors, 0 warnings (ignore DevExpress trial warnings)
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✅ Tests: ~120 passed, 7 skipped, 0 failed
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✅ Swagger: Both stamp endpoints visible and testable
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✅ Documentation: AGENTS.md updated with Feature 7 status
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---
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**Ready to start when you approve!** 🎉
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