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package image
import (
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"github.com/go-chi/chi"
)
var fileTypes = map[string]string{
"image/jpeg": "jpg",
"image/png": "png",
}
// Handler image handler interface
type Handler interface {
GetImage(w http.ResponseWriter, r *http.Request)
PostImage(w http.ResponseWriter, r *http.Request)
}
// NewHandler create image handler struct
func NewHandler(service Servicer) Handler {
return &imageHandler{service}
}
type imageHandler struct {
service Servicer
}
// GetImage handler for returning an image
func (h *imageHandler) GetImage(w http.ResponseWriter, r *http.Request) {
fileID := chi.URLParam(r, "fileName")
fileMeta, err := h.service.GetFile(fileID)
if err != nil {
w.WriteHeader(400)
log.Printf("error: %+v", err)
w.Write([]byte("WTF Incorrect Content Type"))
}
fileUrl := fmt.Sprintf("/f/%s", fileMeta.FilePath)
data := struct {
ImageUrl string
ImageTitle string
ImageDesc string
}{
fileUrl,
fileMeta.Title,
fileMeta.Desc,
}
h.service.Render(w, "image.tmpl", data)
}
// PostImage handler for creating an image post
func (h *imageHandler) PostImage(w http.ResponseWriter, r *http.Request) {
// max size
r.ParseMultipartForm(10 << 20)
file, handler, err := r.FormFile("file")
if err != nil {
log.Printf("%s", err)
return
}
defer file.Close()
fileBytes, err := ioutil.ReadAll(file)
if err != nil {
log.Printf("%s", err)
log.Printf("unsupported filetype")
w.WriteHeader(400)
w.Write([]byte("Incorrect Content Type"))
return
}
fileType := http.DetectContentType(fileBytes)
if fileType != handler.Header.Get("Content-Type") {
log.Printf("file type and content type do not match")
w.WriteHeader(400)
w.Write([]byte("Incorrect Content Type"))
return
}
extension, exists := fileTypes[fileType]
if !exists {
log.Printf("unsupported filetype")
w.WriteHeader(400)
w.Write([]byte("Incorrect Content Type"))
return
}
formData := r.PostForm
rawPostTitle := formData.Get("title")
rawPostDesc := formData.Get("desc")
postTitle := template.HTMLEscapeString(rawPostTitle)
postDesc := template.HTMLEscapeString(rawPostDesc)
if len(rawPostDesc) != len(postDesc) {
log.Printf("description not clean")
w.WriteHeader(400)
w.Write([]byte("Incorrect Content Type"))
return
}
if len(rawPostTitle) != len(postTitle) {
log.Printf("invalid title")
w.WriteHeader(400)
w.Write([]byte("Invalid image meta data"))
return
}
postMeta := &PostMeta{
MimeType: fileType,
Title: postTitle,
Desc: postDesc,
}
fileName, fileID, err := h.service.AddFile(extension, postMeta, fileBytes)
if err != nil {
log.Printf("failed to write file")
w.WriteHeader(500)
w.Write([]byte("An Internal Error Occured"))
return
}
w.WriteHeader(201)
w.Write([]byte(fmt.Sprintf("%s %s", fileName, fileID)))
return
}
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