feat: added API gateway

internal/gw/handler/submission_handler.go

@@ -0,0 +1,90 @@
+package handler
+
+import (
+	"net/http"
+
+	"datarush/internal/gw/domain"
+	"datarush/internal/gw/grpc_client"
+	"datarush/internal/gw/storage"
+	"datarush/internal/gw/utils"
+)
+
+type SubmissionHandler struct {
+	submissionClient *grpc_client.SubmissionClient
+	s3Storage        *storage.S3Storage
+}
+
+func NewSubmissionHandler(
+	submissionClient *grpc_client.SubmissionClient,
+	s3Storage *storage.S3Storage,
+) *SubmissionHandler {
+	return &SubmissionHandler{
+		submissionClient: submissionClient,
+		s3Storage:        s3Storage,
+	}
+}
+
+func (h *SubmissionHandler) SubmitTask(w http.ResponseWriter, r *http.Request) {
+	userID, err := getUserIDFromContext(r.Context())
+	if err != nil {
+		utils.RespondError(w, domain.NewUnauthorizedError("unauthorized"))
+		return
+	}
+
+	competitionID := getPathParam(r, "competition_id")
+	taskID := getPathParam(r, "task_id")
+
+	if err := r.ParseMultipartForm(32 << 20); err != nil { // 32 MB max
+		utils.RespondError(w, domain.NewBadRequestError("failed to parse form"))
+		return
+	}
+
+	file, header, err := r.FormFile("content")
+	if err != nil {
+		utils.RespondError(w, domain.NewBadRequestError("missing or invalid file"))
+		return
+	}
+	defer file.Close()
+
+	fileURL, err := h.s3Storage.UploadFile(r.Context(), file, header)
+	if err != nil {
+		utils.RespondError(w, domain.NewInternalServerError("failed to upload file"))
+		return
+	}
+
+	submission, err := h.submissionClient.SubmitTask(r.Context(), userID, competitionID, taskID, fileURL)
+	if err != nil {
+		utils.RespondError(w, domain.NewInternalServerError("failed to submit task"))
+		return
+	}
+
+	utils.RespondJSON(w, http.StatusCreated, &domain.SubmitTaskResponse{
+		SubmissionID: submission.Id,
+	})
+}
+
+func (h *SubmissionHandler) GetSubmissionHistory(w http.ResponseWriter, r *http.Request) {
+	userID, err := getUserIDFromContext(r.Context())
+	if err != nil {
+		utils.RespondError(w, domain.NewUnauthorizedError("unauthorized"))
+		return
+	}
+
+	competitionID := getPathParam(r, "competition_id")
+	taskID := getPathParam(r, "task_id")
+
+	submissions, err := h.submissionClient.GetSubmissionsHistory(r.Context(), userID, competitionID, taskID)
+	if err != nil {
+		utils.RespondError(w, domain.NewInternalServerError("failed to get submission history"))
+		return
+	}
+
+	response := make([]domain.SubmissionResponse, len(submissions))
+	for i, sub := range submissions {
+		response[i] = *utils.SubmissionProtoToHTTP(sub)
+	}
+
+	utils.RespondJSON(w, http.StatusOK, &domain.SubmissionHistoryResponse{
+		Submissions: response,
+	})
+}