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| package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/google/uuid"
"github.com/gorilla/mux"
_ "github.com/joho/godotenv/autoload"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/speps/go-hashids/v2"
"gorm.io/driver/mysql"
"gorm.io/gorm"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"time"
)
var (
hd *hashids.HashIDData
db *gorm.DB
minioClient *minio.Client
bucketName string
count int64
)
type Link struct {
ID uint `gorm:"primarykey" json:"-"`
Source string `json:"source"`
Code string `gorm:"index" json:"code"`
Key string `gorm:"key" json:"key"`
ContentType string `gorm:"content_type" json:"content_type"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
DeletedAt *gorm.DeletedAt `gorm:"index" json:"deleted_at,omitempty"`
}
func init() {
hd = hashids.NewData()
hd.Salt = os.Getenv("APP_KEY")
hd.MinLength = 5
dsn := fmt.Sprintf(
"%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=true",
os.Getenv("DB_USERNAME"),
os.Getenv("DB_PASSWORD"),
os.Getenv("DB_HOST"),
os.Getenv("DB_PORT"),
os.Getenv("DB_DATABASE"),
)
var err error
if db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{}); err != nil {
log.Fatal(err.Error())
}
if err = db.AutoMigrate(&Link{}); err != nil {
log.Fatal(err.Error())
}
endpoint := os.Getenv("MINIO_ENDPOINT")
accessKey := os.Getenv("MINIO_ACCESS_KEY")
secretKey := os.Getenv("MINIO_SECRET_KEY")
bucketName = os.Getenv("MINIO_BUCKET")
if minioClient, err = minio.New(endpoint, &minio.Options{
Creds: credentials.NewStaticV4(accessKey, secretKey, ""),
}); err != nil {
log.Fatal(err)
}
exists, err := minioClient.BucketExists(context.Background(), bucketName)
if err != nil {
log.Fatal(err.Error())
}
if !exists {
opts := minio.MakeBucketOptions{}
if err = minioClient.MakeBucket(context.Background(), bucketName, opts); err != nil {
log.Fatal(err.Error())
}
}
}
func main() {
r := mux.NewRouter()
r.HandleFunc("/{code}", Redirect).Methods(http.MethodGet, http.MethodOptions)
r.HandleFunc("/api/links/{code}", ShowLink).Methods(http.MethodGet, http.MethodOptions)
r.HandleFunc("/api/links", StoreLink).Methods(http.MethodPost, http.MethodOptions)
r.HandleFunc("/api/links/{code}", DestroyLink).Methods(http.MethodDelete, http.MethodOptions)
r.HandleFunc("/api/objects/{object}", ShowObject).Methods(http.MethodGet, http.MethodOptions)
r.HandleFunc("/api/objects", StoreObject).Methods(http.MethodPost, http.MethodOptions)
log.Fatal(http.ListenAndServe(":80", r))
}
func Redirect(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
response(w, http.StatusOK, nil)
return
}
link := Link{}
if err := find(mux.Vars(r)["code"], &link); err != nil {
response(w, http.StatusNotFound, nil)
return
}
http.Redirect(w, r, link.Source, http.StatusMovedPermanently)
}
func StoreLink(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
response(w, http.StatusOK, nil)
return
}
link := Link{}
if err := json.NewDecoder(r.Body).Decode(&link); err != nil {
response(w, http.StatusInternalServerError, Payload{Error: err.Error()})
return
}
store(&link)
response(w, http.StatusCreated, Payload{
Data: link,
})
}
func ShowLink(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
response(w, http.StatusOK, nil)
return
}
link := Link{}
if err := find(mux.Vars(r)["code"], &link); err != nil {
response(w, http.StatusNotFound, nil)
return
}
response(w, http.StatusOK, Payload{
Data: link,
})
}
func DestroyLink(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
response(w, http.StatusOK, nil)
return
}
link := Link{}
if err := find(mux.Vars(r)["code"], &link); err != nil {
response(w, http.StatusNotFound, nil)
return
}
if link.Key != "" && link.Key != r.URL.Query().Get("key") {
response(w, http.StatusForbidden, nil)
return
}
if link.ContentType != "" {
objectName := filepath.Base(link.Source)
opts := minio.RemoveObjectOptions{}
err := minioClient.RemoveObject(context.Background(), bucketName, objectName, opts)
if err != nil {
response(w, http.StatusInternalServerError, err.Error())
return
}
}
db.Delete(&link)
response(w, http.StatusNoContent, nil)
}
func StoreObject(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
response(w, http.StatusOK, nil)
return
}
if err := r.ParseMultipartForm(32 << 20); err != nil {
response(w, http.StatusBadRequest, err.Error())
return
}
fileHeaders := r.MultipartForm.File["files[]"]
key := r.MultipartForm.Value["key"][0]
if len(fileHeaders) < 1 {
response(w, http.StatusBadRequest, nil)
return
}
header := fileHeaders[0]
file, err := header.Open()
if err != nil {
response(w, http.StatusInternalServerError, err.Error())
return
}
defer func() {
if err := file.Close(); err != nil {
log.Println(err.Error())
}
}()
objectName := strings.ReplaceAll(uuid.NewString(), "-", "") + filepath.Ext(header.Filename)
b, err := ioutil.ReadAll(r.Body)
if err != nil {
response(w, http.StatusInternalServerError, err.Error())
return
}
contentType := http.DetectContentType(b)
opts := minio.PutObjectOptions{ContentType: contentType}
_, err = minioClient.PutObject(context.Background(), bucketName, objectName, file, header.Size, opts)
if err != nil {
response(w, http.StatusInternalServerError, err.Error())
return
}
link := Link{
Source: fmt.Sprintf("%s/%s", os.Getenv("APP_OBJECT_ENDPOINT"), objectName),
Key: key,
ContentType: contentType,
}
store(&link)
response(w, http.StatusCreated, Payload{
Data: link,
})
}
func ShowObject(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
response(w, http.StatusOK, nil)
return
}
objectName := mux.Vars(r)["object"]
opts := minio.GetObjectOptions{}
object, err := minioClient.GetObject(context.Background(), bucketName, objectName, opts)
if err != nil {
response(w, http.StatusInternalServerError, err.Error())
return
}
w.Header().Set("Access-Control-Allow-Origin", "*")
if _, err = io.Copy(w, object); err != nil {
response(w, http.StatusNotFound, err.Error())
}
}
func find(code string, link *Link) error {
id, err := decode(code)
if err != nil {
return err
}
err = db.Where("id = ?", id).First(link).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
return err
}
return nil
}
func store(link *Link) {
db.Model(link).Unscoped().Count(&count)
count++
link.Code = encode(count)
db.Create(link)
}
func encode(id int64) string {
h, _ := hashids.NewWithData(hd)
e, _ := h.Encode([]int{int(id)})
return e
}
func decode(code string) (int, error) {
h, _ := hashids.NewWithData(hd)
d, err := h.DecodeWithError(code)
if err != nil {
return 0, err
}
return d[0], nil
}
type Payload struct {
Data interface{} `json:"data,omitempty"`
Error string `json:"error,omitempty"`
}
func response(w http.ResponseWriter, code int, v interface{}) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "*")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
w.WriteHeader(code)
if v == nil {
return
}
if err := json.NewEncoder(w).Encode(v); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
|