/
util.go
110 lines (97 loc) · 2.86 KB
/
util.go
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// Copyright 2019 kemar
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package adapters
import (
"crypto/rand"
"crypto/sha1"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"os"
"path/filepath"
"strings"
)
const maxUploadSize = 20000 * 1024
const uploadPath = ".../../../assets"
func renderError(w http.ResponseWriter, message string, statusCode int) {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte(message))
}
func randToken(len int, file multipart.File) string {
a := sha1.New()
io.Copy(a, file)
b := make([]byte, len)
rand.Read(b)
ve := a.Sum(nil)
val := append(ve[:], b[:]...)
return fmt.Sprintf("%x", val)
}
// FileUpload ...
func FileUpload(w http.ResponseWriter, r *http.Request) (string, error) {
// validate file size
r.Body = http.MaxBytesReader(w, r.Body, maxUploadSize)
if err := r.ParseMultipartForm(maxUploadSize); err != nil {
renderError(w, "FILE_TOO_BIG", http.StatusBadRequest)
return "", nil
}
// parse and validate file and space parameters
fileType := r.FormValue("type")
file, fh, err := r.FormFile("contentPhoto")
if err != nil {
renderError(w, "INVALID_FILE", http.StatusBadRequest)
return "", nil
}
defer file.Close()
fileBytes, err := ioutil.ReadAll(file)
if err != nil {
renderError(w, "INVALID_FILE", http.StatusBadRequest)
return "", nil
}
ext := strings.Split(fh.Filename, ".")[1]
// check file type, detectcontenttype only needs the first 512 bytes
filetype := http.DetectContentType(fileBytes)
fmt.Println("filetype: ", ext)
switch filetype {
case "image/jpeg", "image/jpg":
case "image/gif", "image/png":
case "application/pdf":
break
default:
renderError(w, "INVALID_FILE_TYPE", http.StatusBadRequest)
return "", nil
}
fileName := randToken(12, file)
wd, err := os.Getwd()
if err != nil {
fmt.Println(err)
}
fileName = fileName + "." + ext
newPath := filepath.Join(wd+uploadPath, "photos", fileName)
fmt.Printf("FileType: %s, File: %s\n", fileType, newPath)
// write file
newFile, err := os.Create(newPath)
if err != nil {
renderError(w, "CANT_WRITE_FILE", http.StatusInternalServerError)
return "", nil
}
defer newFile.Close() // idempotent, okay to call twice
if _, err := newFile.Write(fileBytes); err != nil || newFile.Close() != nil {
renderError(w, "CANT_WRITE_FILE", http.StatusInternalServerError)
return "", nil
}
w.Write([]byte("SUCCESS"))
return fileName, nil
}