add view de

server/internal/handlers/handlers_exam.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"archive/zip"
+	"encoding/base64"
 	"fmt"
 	"io"
 	"math/rand"
@@ -992,9 +993,128 @@ func examViewMimeType(fileName string) string {
 }
 
 func sendExamFileInline(c *fiber.Ctx, filePath, fileName string) error {
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return c.Status(404).JSON(fiber.Map{"error": "Không đọc được file"})
+	}
 	c.Set("Content-Type", examViewMimeType(fileName))
 	c.Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", fileName))
-	return c.SendFile(filePath)
+	return c.Send(data)
+}
+
+func encodeExamFileViewPayload(filePath, fileName, title string) (fiber.Map, error) {
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return nil, err
+	}
+	if fileName == "" {
+		fileName = filepath.Base(filePath)
+	}
+	return fiber.Map{
+		"title":    title,
+		"fileName": fileName,
+		"mime":     examViewMimeType(fileName),
+		"data":     base64.StdEncoding.EncodeToString(data),
+	}, nil
+}
+
+// GET /api/exam-rooms/:id/papers/:paperId/view — JSON base64, dùng cho xem trên web (không tải file)
+func ViewStaffExamPaperHandler(db *gorm.DB) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		roomID, err := parseUintParam(c, "id")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid id"})
+		}
+		paperID, err := parseUintParam(c, "paperId")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid paperId"})
+		}
+		var paper models.ExamPaper
+		if err := db.Where("id = ? AND exam_room_id = ?", paperID, roomID).First(&paper).Error; err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "Không tìm thấy gói đề"})
+		}
+		payload, err := encodeExamFileViewPayload(paper.PdfPath, "de-thi.pdf", paper.Title)
+		if err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "File PDF đề không tồn tại trên server"})
+		}
+		return c.JSON(payload)
+	}
+}
+
+// GET /api/exam-rooms/:id/papers/:paperId/resources/:resId/view
+func ViewStaffExamPaperResourceHandler(db *gorm.DB) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		roomID, err := parseUintParam(c, "id")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid id"})
+		}
+		paperID, err := parseUintParam(c, "paperId")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid paperId"})
+		}
+		resID, err := parseUintParam(c, "resId")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid resId"})
+		}
+		var paper models.ExamPaper
+		if err := db.Where("id = ? AND exam_room_id = ?", paperID, roomID).First(&paper).Error; err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "Không tìm thấy gói đề"})
+		}
+		var res models.ExamPaperResource
+		if err := db.Where("id = ? AND exam_paper_id = ?", resID, paper.ID).First(&res).Error; err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "File tài nguyên không tồn tại"})
+		}
+		payload, err := encodeExamFileViewPayload(res.FilePath, res.FileName, res.FileName)
+		if err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "File tài nguyên không tồn tại trên server"})
+		}
+		return c.JSON(payload)
+	}
+}
+
+// GET /api/exam-rooms/:id/papers/:paperId/download?kind=pdf|resource&fileId=&view=1
+func DownloadStaffExamPaperFileHandler(db *gorm.DB) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		roomID, err := parseUintParam(c, "id")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid id"})
+		}
+		paperID, err := parseUintParam(c, "paperId")
+		if err != nil {
+			return c.Status(400).JSON(fiber.Map{"error": "Invalid paperId"})
+		}
+		var paper models.ExamPaper
+		if err := db.Where("id = ? AND exam_room_id = ?", paperID, roomID).First(&paper).Error; err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "Không tìm thấy gói đề"})
+		}
+		inline := c.Query("view") == "1" || c.Query("inline") == "1"
+		kind := c.Query("kind", "pdf")
+		if kind == "pdf" {
+			if _, statErr := os.Stat(paper.PdfPath); statErr != nil {
+				return c.Status(404).JSON(fiber.Map{"error": "File PDF đề không tồn tại trên server"})
+			}
+			name := filepath.Base(paper.PdfPath)
+			if name == "" || name == "." {
+				name = "de-thi.pdf"
+			}
+			if inline {
+				return sendExamFileInline(c, paper.PdfPath, name)
+			}
+			return c.Download(paper.PdfPath, name)
+		}
+		fileID, _ := strconv.ParseUint(c.Query("fileId", "0"), 10, 64)
+		var res models.ExamPaperResource
+		if err := db.Where("id = ? AND exam_paper_id = ?", fileID, paper.ID).First(&res).Error; err != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "File tài nguyên không tồn tại"})
+		}
+		if _, statErr := os.Stat(res.FilePath); statErr != nil {
+			return c.Status(404).JSON(fiber.Map{"error": "File tài nguyên không tồn tại trên server"})
+		}
+		if inline && examFileCanViewInline(res.FileName) {
+			return sendExamFileInline(c, res.FilePath, res.FileName)
+		}
+		return c.Download(res.FilePath, res.FileName)
+	}
 }
 
 // POST /api/student/exam/submit — multipart zip

server/main.go

@@ -179,6 +179,9 @@ func main() {
 	staff.Post("/exam-rooms/:id/papers", handlers.UploadExamPaperHandler(gormDB))
 	staff.Post("/exam-rooms/:id/papers/:paperId/resources", handlers.UploadExamPaperResourceHandler(gormDB))
 	staff.Delete("/exam-rooms/:id/papers/:paperId", handlers.DeleteExamPaperHandler(gormDB))
+	staff.Get("/exam-rooms/:id/papers/:paperId/view", handlers.ViewStaffExamPaperHandler(gormDB))
+	staff.Get("/exam-rooms/:id/papers/:paperId/resources/:resId/view", handlers.ViewStaffExamPaperResourceHandler(gormDB))
+	staff.Get("/exam-rooms/:id/papers/:paperId/download", handlers.DownloadStaffExamPaperFileHandler(gormDB))
 	staff.Post("/exam-rooms/:id/publish", handlers.PublishExamRoomHandler(gormDB))
 	staff.Post("/exam-rooms/:id/unpublish", handlers.UnpublishExamRoomHandler(gormDB))
 	staff.Post("/exam-rooms/:id/cancel", handlers.CancelExamRoomHandler(gormDB))