First setup of a go server

handlers/sheets.go

@@ -0,0 +1,150 @@
+package handlers
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sheetless-server/database"
+	"sheetless-server/models"
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+const uploadDir = "./uploads"
+
+func init() {
+	// Create uploads directory if it doesn't exist
+	if err := os.MkdirAll(uploadDir, 0755); err != nil {
+		panic("Failed to create uploads directory: " + err.Error())
+	}
+}
+
+func UploadSheet(c *gin.Context) {
+	userID, exists := c.Get("user_id")
+	if !exists {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "User not authenticated"})
+		return
+	}
+
+	// Get form data
+	title := c.PostForm("title")
+	if title == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Title is required"})
+		return
+	}
+
+	composer := c.PostForm("composer")
+	description := c.PostForm("description")
+
+	// Get uploaded file
+	file, header, err := c.Request.FormFile("file")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "File upload failed"})
+		return
+	}
+	defer file.Close()
+
+	// Validate file type (should be PDF)
+	if filepath.Ext(header.Filename) != ".pdf" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Only PDF files are allowed"})
+		return
+	}
+
+	// Generate unique filename
+	filename := fmt.Sprintf("%d_%d%s", userID.(uint), time.Now().Unix(), filepath.Ext(header.Filename))
+	filePath := filepath.Join(uploadDir, filename)
+
+	// Save file
+	out, err := os.Create(filePath)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save file"})
+		return
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, file)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save file"})
+		return
+	}
+
+	// Get file size
+	fileInfo, err := out.Stat()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get file info"})
+		return
+	}
+
+	// Create database record
+	sheet := models.MusicSheet{
+		Title:       title,
+		Composer:    composer,
+		Description: description,
+		FilePath:    filePath,
+		FileSize:    fileInfo.Size(),
+		UserID:      userID.(uint),
+	}
+
+	if err := database.DB.Create(&sheet).Error; err != nil {
+		// Clean up file if database insert fails
+		os.Remove(filePath)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save sheet metadata"})
+		return
+	}
+
+	c.JSON(http.StatusCreated, gin.H{
+		"message": "Sheet uploaded successfully",
+		"sheet":   sheet,
+	})
+}
+
+func ListSheets(c *gin.Context) {
+	var sheets []models.MusicSheet
+
+	query := database.DB.Preload("User")
+
+	// Filter by user if specified
+	if userIDStr := c.Query("user_id"); userIDStr != "" {
+		userID, err := strconv.ParseUint(userIDStr, 10, 32)
+		if err == nil {
+			query = query.Where("user_id = ?", uint(userID))
+		}
+	}
+
+	if err := query.Find(&sheets).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch sheets"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"sheets": sheets})
+}
+
+func DownloadSheet(c *gin.Context) {
+	idStr := c.Param("id")
+	id, err := strconv.ParseUint(idStr, 10, 32)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid sheet ID"})
+		return
+	}
+
+	var sheet models.MusicSheet
+	if err := database.DB.First(&sheet, uint(id)).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Sheet not found"})
+		return
+	}
+
+	// Check if file exists
+	if _, err := os.Stat(sheet.FilePath); os.IsNotExist(err) {
+		c.JSON(http.StatusNotFound, gin.H{"error": "File not found"})
+		return
+	}
+
+	// Set headers for file download
+	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filepath.Base(sheet.FilePath)))
+	c.Header("Content-Type", "application/pdf")
+	c.File(sheet.FilePath)
+}