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// Package upload provides a re-usable file upload and storage utility for Ponzu
// systems to handle multipart form data.
package upload
import (
"fmt"
"io"
"log"
"mime/multipart"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"time"
"github.com/ponzu-cms/ponzu/system/db"
"github.com/ponzu-cms/ponzu/system/item"
)
// StoreFiles stores file uploads at paths like /YYYY/MM/filename.ext
func StoreFiles(req *http.Request) (map[string]string, error) {
err := req.ParseMultipartForm(1024 * 1024 * 4) // maxMemory 4MB
if err != nil {
return nil, err
}
ts := req.FormValue("timestamp") // timestamp in milliseconds since unix epoch
if ts == "" {
ts = fmt.Sprintf("%d", int64(time.Nanosecond)*time.Now().UnixNano()/int64(time.Millisecond)) // Unix() returns seconds since unix epoch
}
// To use for FormValue name:urlPath
urlPaths := make(map[string]string)
if len(req.MultipartForm.File) == 0 {
return urlPaths, nil
}
req.Form.Set("timestamp", ts)
// get or create upload directory to save files from request
i, err := strconv.ParseInt(ts, 10, 64)
if err != nil {
return nil, err
}
tm := time.Unix(int64(i/1000), int64(i%1000))
urlPathPrefix := "api"
uploadDirName := "uploads"
uploadDir := filepath.Join(cfg.UploadDir(), fmt.Sprintf("%d", tm.Year()), fmt.Sprintf("%02d", tm.Month()))
err = os.MkdirAll(uploadDir, os.ModeDir|os.ModePerm)
if err != nil {
return nil, err
}
// loop over all files and save them to disk
for name, fds := range req.MultipartForm.File {
filename, err := item.NormalizeString(fds[0].Filename)
if err != nil {
return nil, err
}
src, err := fds[0].Open()
if err != nil {
err := fmt.Errorf("Couldn't open uploaded file: %s", err)
return nil, err
}
defer src.Close()
// check if file at path exists, if so, add timestamp to file
absPath := filepath.Join(uploadDir, filename)
if _, err := os.Stat(absPath); !os.IsNotExist(err) {
filename = fmt.Sprintf("%d-%s", time.Now().Unix(), filename)
absPath = filepath.Join(uploadDir, filename)
}
// save to disk (TODO: or check if S3 credentials exist, & save to cloud)
dst, err := os.Create(absPath)
if err != nil {
err := fmt.Errorf("Failed to create destination file for upload: %s", err)
return nil, err
}
// copy file from src to dst on disk
var size int64
if size, err = io.Copy(dst, src); err != nil {
err := fmt.Errorf("Failed to copy uploaded file to destination: %s", err)
return nil, err
}
// add name:urlPath to req.PostForm to be inserted into db
urlPath := fmt.Sprintf("/%s/%s/%d/%02d/%s", urlPathPrefix, uploadDirName, tm.Year(), tm.Month(), filename)
urlPaths[name] = urlPath
// add upload information to db
go storeFileInfo(size, filename, urlPath, fds)
}
return urlPaths, nil
}
func storeFileInfo(size int64, filename, urlPath string, fds []*multipart.FileHeader) {
data := url.Values{
"name": []string{filename},
"path": []string{urlPath},
"content_type": []string{fds[0].Header.Get("Content-Type")},
"content_length": []string{fmt.Sprintf("%d", size)},
}
_, err := db.SetUpload("__uploads:-1", data)
if err != nil {
log.Println("Error saving file upload record to database:", err)
}
}
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