mirror of
https://github.com/dutchcoders/transfer.sh.git
synced 2024-11-23 20:50:18 +01:00
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
|
package handlers
|
||
|
|
||
|
import (
|
||
|
"net/http"
|
||
|
)
|
||
|
|
||
|
// Structure that holds the context map and exposes the ResponseWriter interface.
|
||
|
type contextResponseWriter struct {
|
||
|
http.ResponseWriter
|
||
|
m map[interface{}]interface{}
|
||
|
}
|
||
|
|
||
|
// Implement the WrapWriter interface.
|
||
|
func (this *contextResponseWriter) WrappedWriter() http.ResponseWriter {
|
||
|
return this.ResponseWriter
|
||
|
}
|
||
|
|
||
|
// ContextHandlerFunc is the same as ContextHandler, it is just a convenience
|
||
|
// signature that accepts a func(http.ResponseWriter, *http.Request) instead of
|
||
|
// a http.Handler interface. It saves the boilerplate http.HandlerFunc() cast.
|
||
|
func ContextHandlerFunc(h http.HandlerFunc, cap int) http.HandlerFunc {
|
||
|
return ContextHandler(h, cap)
|
||
|
}
|
||
|
|
||
|
// ContextHandler gives a context storage that lives only for the duration of
|
||
|
// the request, with no locking involved.
|
||
|
func ContextHandler(h http.Handler, cap int) http.HandlerFunc {
|
||
|
return func(w http.ResponseWriter, r *http.Request) {
|
||
|
if _, ok := GetContext(w); ok {
|
||
|
// Self-awareness, context handler is already set up
|
||
|
h.ServeHTTP(w, r)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
// Create the context-providing ResponseWriter replacement.
|
||
|
ctxw := &contextResponseWriter{
|
||
|
w,
|
||
|
make(map[interface{}]interface{}, cap),
|
||
|
}
|
||
|
// Call the wrapped handler with the context-aware writer
|
||
|
h.ServeHTTP(ctxw, r)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Helper function to retrieve the context map from the ResponseWriter interface.
|
||
|
func GetContext(w http.ResponseWriter) (map[interface{}]interface{}, bool) {
|
||
|
ctxw, ok := GetResponseWriter(w, func(tst http.ResponseWriter) bool {
|
||
|
_, ok := tst.(*contextResponseWriter)
|
||
|
return ok
|
||
|
})
|
||
|
if ok {
|
||
|
return ctxw.(*contextResponseWriter).m, true
|
||
|
}
|
||
|
return nil, false
|
||
|
}
|