renaming and moving File upload logic into own package

1 files changed, 90 insertions, 0 deletions

diff --git a/system/admin/upload/upload.go b/system/admin/upload/upload.go
new file mode 100644
index 0000000..169bffe
--- /dev/null
+++ b/system/admin/upload/upload.go
@@ -0,0 +1,90 @@
+package upload
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+)
+
+// 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, fmt.Errorf("%s", err)
+	}
+
+	ts := req.FormValue("timestamp") // timestamp in milliseconds since unix epoch
+
+	if ts == "" {
+		ts = fmt.Sprintf("%d", time.Now().Unix()*1000) // Unix() returns seconds since unix epoch
+	}
+
+	req.Form.Set("timestamp", ts)
+
+	// To use for FormValue name:urlPath
+	urlPaths := make(map[string]string)
+
+	// get or create upload directory to save files from request
+	pwd, err := os.Getwd()
+	if err != nil {
+		err := fmt.Errorf("Failed to locate current directory: %s", err)
+		return nil, err
+	}
+
+	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(pwd, uploadDirName, fmt.Sprintf("%d", tm.Year()), fmt.Sprintf("%d", tm.Month()))
+	err = os.MkdirAll(uploadDir, os.ModeDir|os.ModePerm)
+
+	// loop over all files and save them to disk
+	for name, fds := range req.MultipartForm.File {
+		filename := fds[0].Filename
+		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
+		if _, 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/%d/%s", urlPathPrefix, uploadDirName, tm.Year(), tm.Month(), filename)
+
+		urlPaths[name] = urlPath
+	}
+
+	return urlPaths, nil
+}