Initial commit: Open sourcing all of the Maple Open Technologies code.

cloud/maplefile-backend/internal/interface/http/file/get.go

@@ -0,0 +1,91 @@
+// monorepo/cloud/backend/internal/maplefile/interface/http/file/get.go
+package file
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"go.uber.org/zap"
+
+	"github.com/gocql/gocql"
+	"codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/config"
+	"codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/internal/interface/http/middleware"
+	svc_file "codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/internal/service/file"
+	"codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/pkg/httperror"
+)
+
+type GetFileHTTPHandler struct {
+	config     *config.Configuration
+	logger     *zap.Logger
+	service    svc_file.GetFileService
+	middleware middleware.Middleware
+}
+
+func NewGetFileHTTPHandler(
+	config *config.Configuration,
+	logger *zap.Logger,
+	service svc_file.GetFileService,
+	middleware middleware.Middleware,
+) *GetFileHTTPHandler {
+	logger = logger.Named("GetFileHTTPHandler")
+	return &GetFileHTTPHandler{
+		config:     config,
+		logger:     logger,
+		service:    service,
+		middleware: middleware,
+	}
+}
+
+func (*GetFileHTTPHandler) Pattern() string {
+	return "GET /api/v1/file/{id}"
+}
+
+func (h *GetFileHTTPHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	// Apply middleware before handling the request
+	h.middleware.Attach(h.Execute)(w, req)
+}
+
+func (h *GetFileHTTPHandler) Execute(w http.ResponseWriter, r *http.Request) {
+	// Set response content type
+	w.Header().Set("Content-Type", "application/json")
+
+	ctx := r.Context()
+
+	// Extract file ID from URL parameters
+	fileIDStr := r.PathValue("id")
+	if fileIDStr == "" {
+		httperror.RespondWithError(w, r, httperror.NewForBadRequestWithSingleField("file_id", "File ID is required"))
+		return
+	}
+
+	// Convert string ID to ObjectID
+	fileID, err := gocql.ParseUUID(fileIDStr)
+	if err != nil {
+		h.logger.Error("invalid file ID format",
+			zap.String("file_id", fileIDStr),
+			zap.Error(err))
+		httperror.RespondWithError(w, r, httperror.NewForBadRequestWithSingleField("file_id", "Invalid file ID format"))
+		return
+	}
+
+	resp, err := h.service.Execute(ctx, fileID)
+	if err != nil {
+		httperror.RespondWithError(w, r, err)
+		return
+	}
+
+	// Encode response
+	if resp != nil {
+		if err := json.NewEncoder(w).Encode(resp); err != nil {
+			h.logger.Error("failed to encode response",
+				zap.Any("error", err))
+			httperror.RespondWithError(w, r, err)
+			return
+		}
+	} else {
+		err := errors.New("no result")
+		httperror.RespondWithError(w, r, err)
+		return
+	}
+}