mirror of
https://git.rwth-aachen.de/acs/public/villas/web-backend-go/
synced 2025-03-30 00:00:12 +01:00
146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
/** File package, methods.
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*
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* @author Sonja Happ <sonja.happ@eonerc.rwth-aachen.de>
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* @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASweb-backend-go
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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package file
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import (
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"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/scenario"
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"github.com/gin-gonic/gin"
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"io/ioutil"
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"mime/multipart"
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"net/http"
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"path/filepath"
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"strconv"
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"time"
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"git.rwth-aachen.de/acs/public/villas/web-backend-go/database"
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)
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type File struct {
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database.File
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}
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func (f *File) byID(id uint) error {
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db := database.GetDB()
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err := db.Find(f, id).Error
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if err != nil {
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return err
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}
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return nil
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}
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func (f *File) save() error {
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db := database.GetDB()
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err := db.Create(f).Error
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return err
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}
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func (f *File) download(c *gin.Context) error {
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// create unique file name
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filename := "file_" + strconv.FormatUint(uint64(f.ID), 10) + "_" + f.Name
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// detect the content type of the file
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contentType := http.DetectContentType(f.FileData)
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//Seems this headers needed for some browsers (for example without this headers Chrome will download files as txt)
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c.Header("Content-Description", "File Transfer")
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c.Header("Content-Disposition", "attachment; filename="+filename)
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c.Data(http.StatusOK, contentType, f.FileData)
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return nil
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}
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func (f *File) register(fileHeader *multipart.FileHeader, scenarioID uint) error {
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// Obtain properties of file
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f.Type = fileHeader.Header.Get("Content-Type")
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f.Name = filepath.Base(fileHeader.Filename)
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f.Size = uint(fileHeader.Size)
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f.Date = time.Now().String()
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f.ScenarioID = scenarioID
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// set file data
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fileContent, err := fileHeader.Open()
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if err != nil {
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return err
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}
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f.FileData, err = ioutil.ReadAll(fileContent)
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defer fileContent.Close()
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// Add File object with parameters to DB
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err = f.save()
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if err != nil {
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return err
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}
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// Create association to scenario
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db := database.GetDB()
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var so scenario.Scenario
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err = so.ByID(scenarioID)
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if err != nil {
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return err
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}
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err = db.Model(&so).Association("Files").Append(f).Error
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return err
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}
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func (f *File) update(fileHeader *multipart.FileHeader) error {
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// set file data
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fileContent, err := fileHeader.Open()
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if err != nil {
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return err
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}
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fileData, err := ioutil.ReadAll(fileContent)
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defer fileContent.Close()
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db := database.GetDB()
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err = db.Model(f).Updates(map[string]interface{}{"Size": fileHeader.Size,
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"FileData": fileData,
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"Date": time.Now().String()}).Error
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return err
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}
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func (f *File) delete() error {
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db := database.GetDB()
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// remove association between file and scenario
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var so scenario.Scenario
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err := so.ByID(f.ScenarioID)
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if err != nil {
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return err
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}
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err = db.Model(&so).Association("Files").Delete(f).Error
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if err != nil {
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return err
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}
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// delete file from DB
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err = db.Delete(f).Error
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return err
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}
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