func NewAuthenticatedServer(c *config.Configuration, strategy imageprocessor.ImageProcessorStrategy, auth Authenticator) *Server {
factory := imagestore.NewFactory(c)
httpclient := &http.Client{}
stores := factory.NewImageStores()
hashGenerator := factory.NewHashGenerator(stores)
return &Server{c, httpclient, stores, hashGenerator, strategy, auth}
}
func NewServer(c *config.Configuration, strategy imageprocessor.ImageProcessorStrategy) *Server {
factory := imagestore.NewFactory(c)
httpclient := &http.Client{}
stores := factory.NewImageStores()
store := stores[0]
hashGenerator := factory.NewHashGenerator(store)
authenticator := &PassthroughAuthenticator{}
return &Server{c, httpclient, store, hashGenerator, strategy, authenticator}
}
func (s *Server) buildThumbResponse(upload *uploadedfile.UploadedFile) (map[string]interface{}, error) {
factory := imagestore.NewFactory(s.Config)
thumbsResp := map[string]interface{}{}
for _, t := range upload.GetThumbs() {
thumbName := fmt.Sprintf("%s/%s", upload.GetHash(), t.GetName())
tObj := factory.NewStoreObject(thumbName, upload.GetMime(), "thumbnail")
err := tObj.Store(t, s.ImageStore)
if err != nil {
return nil, err
}
thumbsResp[t.GetName()] = tObj.Url
}
return thumbsResp, nil
}
func (s *Server) uploadFile(uploadFile io.Reader, fileName string, thumbs []*uploadedfile.ThumbFile, user *AuthenticatedUser) ServerResponse {
tmpFile, err := ioutil.TempFile(os.TempDir(), "image")
if err != nil {
fmt.Println(err)
return ServerResponse{
Error: "Unable to write to /tmp",
Status: http.StatusInternalServerError,
}
}
defer tmpFile.Close()
_, err = io.Copy(tmpFile, uploadFile)
if err != nil {
fmt.Println(err)
return ServerResponse{
Error: "Unable to copy image to disk!",
Status: http.StatusInternalServerError,
}
}
upload, err := uploadedfile.NewUploadedFile(fileName, tmpFile.Name(), thumbs)
defer upload.Clean()
if err != nil {
return ServerResponse{
Error: "Error detecting mime type!",
Status: http.StatusInternalServerError,
}
}
processor, err := s.processorStrategy(s.Config, upload)
if err != nil {
log.Printf("Error creating processor factory: %s", err.Error())
return ServerResponse{
Error: "Unable to process image!",
Status: http.StatusInternalServerError,
}
}
err = processor.Run(upload)
if err != nil {
log.Printf("Error processing %+v: %s", upload, err.Error())
return ServerResponse{
Error: "Unable to process image!",
Status: http.StatusInternalServerError,
}
}
upload.SetHash(s.hashGenerator.Get())
factory := imagestore.NewFactory(s.Config)
obj := factory.NewStoreObject(upload.GetHash(), upload.GetMime(), "original")
uploadFilepath := upload.GetPath()
uploadFileFd, err := os.Open(uploadFilepath)
if err != nil {
log.Printf("Error opening processed output %+v at %s: %s", upload, uploadFilepath, err.Error())
return ServerResponse{
Error: "Unable to save image!",
Status: http.StatusInternalServerError,
}
}
obj, err = s.ImageStore.Save(uploadFileFd, obj)
if err != nil {
log.Printf("Error saving processed output to store: %s", err.Error())
return ServerResponse{
Error: "Unable to save image!",
Status: http.StatusInternalServerError,
}
}
thumbsResp := map[string]interface{}{}
for _, t := range upload.GetThumbs() {
thumbName := fmt.Sprintf("%s/%s", upload.GetHash(), t.GetName())
tObj := factory.NewStoreObject(thumbName, upload.GetMime(), "t")
tPath := t.GetPath()
tFile, err := os.Open(tPath)
if err != nil {
return ServerResponse{
Error: "Unable to save thumbnail!",
Status: http.StatusInternalServerError,
}
}
tObj, err = s.ImageStore.Save(tFile, tObj)
if err != nil {
return ServerResponse{
Error: "Unable to save thumbnail!",
Status: http.StatusInternalServerError,
}
}
thumbsResp[t.GetName()] = tObj.Url
}
size, err := upload.FileSize()
if err != nil {
return ServerResponse{
Error: "Unable to fetch image metadata!",
Status: http.StatusInternalServerError,
}
}
width, height, err := upload.Dimensions()
if err != nil {
return ServerResponse{
Error: "Error fetching upload dimensions: " + err.Error(),
Status: http.StatusInternalServerError,
}
}
var userID string
if user != nil {
userID = string(user.UserID)
}
resp := ImageResponse{
Link: obj.Url,
Mime: obj.MimeType,
Hash: upload.GetHash(),
Name: fileName,
Size: size,
Width: width,
Height: height,
OCRText: upload.GetOCRText(),
Thumbs: thumbsResp,
UserID: userID,
}
return ServerResponse{
Data: resp,
Status: http.StatusOK,
}
}
func (s *Server) uploadFile(uploadFile io.Reader, fileName string, thumbs []*uploadedfile.ThumbFile, user *AuthenticatedUser) ServerResponse {
tmpFile, err := saveToTmp(uploadFile)
if err != nil {
return ServerResponse{
Error: "Error saving to disk!",
Status: http.StatusInternalServerError,
}
}
upload, err := uploadedfile.NewUploadedFile(fileName, tmpFile, thumbs)
defer upload.Clean()
if err != nil {
return ServerResponse{
Error: "Error detecting mime type!",
Status: http.StatusInternalServerError,
}
}
processor, err := s.processorStrategy(s.Config, upload)
if err != nil {
log.Printf("Error creating processor factory: %s", err.Error())
return ServerResponse{
Error: "Unable to process image!",
Status: http.StatusInternalServerError,
}
}
err = processor.Run(upload)
if err != nil {
log.Printf("Error processing %+v: %s", upload, err.Error())
return ServerResponse{
Error: "Unable to process image!",
Status: http.StatusInternalServerError,
}
}
upload.SetHash(s.hashGenerator.Get())
factory := imagestore.NewFactory(s.Config)
obj := factory.NewStoreObject(upload.GetHash(), upload.GetMime(), "original")
uploadFilepath := upload.GetPath()
obj, err = s.ImageStore.Save(uploadFilepath, obj)
if err != nil {
log.Printf("Error saving processed output to store: %s", err.Error())
return ServerResponse{
Error: "Unable to save image!",
Status: http.StatusInternalServerError,
}
}
thumbsResp, err := s.buildThumbResponse(upload)
if err != nil {
return ServerResponse{
Error: "Unable to process thumbnail!",
Status: http.StatusInternalServerError,
}
}
size, err := upload.FileSize()
if err != nil {
return ServerResponse{
Error: "Unable to fetch image metadata!",
Status: http.StatusInternalServerError,
}
}
width, height, err := upload.Dimensions()
if err != nil {
return ServerResponse{
Error: "Error fetching upload dimensions: " + err.Error(),
Status: http.StatusInternalServerError,
}
}
var userID string
if user != nil {
userID = string(user.UserID)
}
resp := ImageResponse{
Link: obj.Url,
Mime: obj.MimeType,
Hash: upload.GetHash(),
Name: fileName,
Size: size,
Width: width,
Height: height,
OCRText: upload.GetOCRText(),
Thumbs: thumbsResp,
UserID: userID,
}
return ServerResponse{
Data: resp,
Status: http.StatusOK,
}
}
func (s *Server) Configure(muxer *http.ServeMux) {
var extractorFile fileExtractor = func(r *http.Request) (uploadFile io.Reader, filename string, uerr *UserError) {
uploadFile, header, err := r.FormFile("image")
if err != nil {
return nil, "", &UserError{LogMessage: err, UserFacingMessage: errors.New("Error processing file")}
}
return uploadFile, header.Filename, nil
}
var extractorUrl fileExtractor = func(r *http.Request) (uploadFile io.Reader, filename string, uerr *UserError) {
url := r.FormValue("image")
uploadFile, err := s.download(url)
if err != nil {
return nil, "", &UserError{LogMessage: err, UserFacingMessage: errors.New("Error downloading URL!")}
}
return uploadFile, path.Base(url), nil
}
var extractorBase64 fileExtractor = func(r *http.Request) (uploadFile io.Reader, filename string, uerr *UserError) {
input := r.FormValue("image")
b64data := input[strings.IndexByte(input, ',')+1:]
uploadFile = base64.NewDecoder(base64.StdEncoding, strings.NewReader(b64data))
return uploadFile, "", nil
}
type uploadEndpoint func(fileExtractor, *AuthenticatedUser) http.HandlerFunc
var uploadHandler uploadEndpoint = func(extractor fileExtractor, user *AuthenticatedUser) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
uploadFile, filename, uerr := extractor(r)
if uerr != nil {
log.Printf("Error extracting files: %s", uerr.LogMessage.Error())
resp := ServerResponse{
Status: http.StatusBadRequest,
Error: uerr.UserFacingMessage.Error(),
}
resp.Write(w)
return
}
thumbs, err := parseThumbs(r)
if err != nil {
resp := ServerResponse{
Status: http.StatusBadRequest,
Error: "Error parsing thumbnails!",
}
resp.Write(w)
return
}
resp := s.uploadFile(uploadFile, filename, thumbs, user)
switch uploadFile.(type) {
case io.ReadCloser:
defer uploadFile.(io.ReadCloser).Close()
break
default:
break
}
resp.Write(w)
}
}
// Wrap an existing upload endpoint with authentication, returning a new endpoint that 4xxs unless authentication is passed.
authenticatedEndpoint := func(endpoint uploadEndpoint, extractor fileExtractor) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
requestVars := mux.Vars(r)
attemptedUserIdString, ok := requestVars["user_id"]
// They didn't send a user ID to a /user endpoint
if !ok || attemptedUserIdString == "" {
w.WriteHeader(http.StatusBadRequest)
return
}
user, err := s.authenticator.GetUser(r)
// Their HMAC was invalid or they are trying to upload to someone else's account
if user == nil || err != nil || user.UserID != attemptedUserIdString {
w.WriteHeader(http.StatusUnauthorized)
log.Printf("Authentication error: %s", err.Error())
return
}
handler := endpoint(extractor, user)
handler(w, r)
}
}
thumbnailHandler := func(w http.ResponseWriter, r *http.Request) {
imageID := r.FormValue("uid")
factory := imagestore.NewFactory(s.Config)
tObj := factory.NewStoreObject(imageID, "", "original")
thumbs, err := parseThumbs(r)
if err != nil {
resp := ServerResponse{
Status: http.StatusBadRequest,
Error: "Error parsing thumbnails!",
}
resp.Write(w)
return
}
if len(thumbs) != 1 {
resp := ServerResponse{
Status: http.StatusBadRequest,
Error: "Wrong number of thumbnails, expected 1",
}
resp.Write(w)
return
}
storeReader, err := s.ImageStore.Get(tObj)
if err != nil {
resp := ServerResponse{
Status: http.StatusBadRequest,
Error: fmt.Sprintf("Error retrieving image with ID: %s", imageID),
}
resp.Write(w)
return
}
defer storeReader.Close()
storeFile, err := saveToTmp(storeReader)
if err != nil {
resp := ServerResponse{
Status: http.StatusBadRequest,
Error: "Error parsing thumbnails!",
}
resp.Write(w)
return
}
defer os.Remove(storeFile)
upload, err := uploadedfile.NewUploadedFile("", storeFile, thumbs)
if err != nil {
log.Printf("Error processing %+v: %s", storeFile, err.Error())
resp := ServerResponse{
Error: "Unable to process thumbnail!",
Status: http.StatusInternalServerError,
}
resp.Write(w)
return
}
upload.SetHash(imageID)
defer upload.Clean()
processor, _ := imageprocessor.ThumbnailStrategy(s.Config, upload)
err = processor.Run(upload)
if err != nil {
log.Printf("Error processing %+v: %s", upload, err.Error())
resp := ServerResponse{
Error: "Unable to process thumbnail!",
Status: http.StatusInternalServerError,
}
resp.Write(w)
return
}
ts := upload.GetThumbs()
t := ts[0]
thumbName := fmt.Sprintf("%s/%s", upload.GetHash(), t.GetName())
tObj = factory.NewStoreObject(thumbName, upload.GetMime(), "thumbnail")
err = tObj.Store(t, s.ImageStore)
if err != nil {
log.Printf("Error storing %+v: %s", t, err.Error())
resp := ServerResponse{
Error: "Unable to store thumbnail!",
Status: http.StatusInternalServerError,
}
resp.Write(w)
return
}
http.ServeFile(w, r, t.GetPath())
}
rootHandler := func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "<html><head><title>An open source image uploader by Imgur</title></head><body style=\"background-color: #2b2b2b; color: white\">")
fmt.Fprint(w, "Congratulations! Your image upload server is up and running. Head over to the <a style=\"color: #85bf25 \" href=\"https://github.com/Imgur/mandible\">github</a> page for documentation")
fmt.Fprint(w, "<br/><br/><br/><img src=\"http://i.imgur.com/YbfUjs5.png?2\" />")
fmt.Fprint(w, "</body></html>")
}
router := mux.NewRouter()
router.HandleFunc("/file", uploadHandler(extractorFile, nil))
router.HandleFunc("/url", uploadHandler(extractorUrl, nil))
router.HandleFunc("/base64", uploadHandler(extractorBase64, nil))
router.HandleFunc("/user/{user_id}/file", authenticatedEndpoint(uploadHandler, extractorBase64))
router.HandleFunc("/user/{user_id}/url", authenticatedEndpoint(uploadHandler, extractorUrl))
router.HandleFunc("/user/{user_id}/base64", authenticatedEndpoint(uploadHandler, extractorBase64))
router.HandleFunc("/thumbnail", thumbnailHandler)
router.HandleFunc("/", rootHandler)
muxer.Handle("/", router)
}