feat(schedules): add the ability to update a schedule script (#2438)

api/http/handler/schedules/schedule_file.go

@@ -0,0 +1,41 @@
+package schedules
+
+import (
+	"errors"
+	"net/http"
+
+	httperror "github.com/portainer/libhttp/error"
+	"github.com/portainer/libhttp/request"
+	"github.com/portainer/libhttp/response"
+	"github.com/portainer/portainer"
+)
+
+type scheduleFileResponse struct {
+	ScheduleFileContent string `json:"ScheduleFileContent"`
+}
+
+// GET request on /api/schedules/:id/file
+func (handler *Handler) scheduleFile(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	scheduleID, err := request.RetrieveNumericRouteVariableValue(r, "id")
+	if err != nil {
+		return &httperror.HandlerError{http.StatusBadRequest, "Invalid schedule identifier route variable", err}
+	}
+
+	schedule, err := handler.ScheduleService.Schedule(portainer.ScheduleID(scheduleID))
+	if err == portainer.ErrObjectNotFound {
+		return &httperror.HandlerError{http.StatusNotFound, "Unable to find a schedule with the specified identifier inside the database", err}
+	} else if err != nil {
+		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to find a schedule with the specified identifier inside the database", err}
+	}
+
+	if schedule.JobType != portainer.ScriptExecutionJobType {
+		return &httperror.HandlerError{http.StatusBadRequest, "Unable to retrieve script file", errors.New("This type of schedule do not have any associated script file")}
+	}
+
+	scheduleFileContent, err := handler.FileService.GetFileContent(schedule.ScriptExecutionJob.ScriptPath)
+	if err != nil {
+		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve schedule script file from disk", err}
+	}
+
+	return response.JSON(w, &scheduleFileResponse{ScheduleFileContent: string(scheduleFileContent)})
+}