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vermittler.go
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/
vermittler.go
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package main
import (
"encoding/base64"
"net/http"
)
// Vermittler handler
type Vermittler struct {
Cfg *Config
}
// Serves the app
func (v Vermittler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var img *Image
var err error
var format string
r.ParseForm()
filename := string(base64.URLEncoding.EncodeToString([]byte(r.Form.Encode())))
imageExists := false
if v.Cfg.CacheEnabled {
imageExists, format, err = FileInCache(filename, v.Cfg)
}
if !imageExists || !v.Cfg.CacheEnabled {
img, err = NewImage(r.Form)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = img.Apply()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
} else {
// For some reason OS X does weird things with .DS_Store
if format == "DS_Store" {
return
}
img, err = LoadImage(filename+"."+format, v.Cfg)
}
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if v.Cfg.CacheEnabled && !imageExists {
go CacheFile(filename+"."+img.Format, img, v.Cfg)
}
w.Header().Add("Content-Type", "image/"+img.Format)
err = img.Write(w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}