60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"flag"
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"io"
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"log"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"strconv"
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"text/template"
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)
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func main() {
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fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
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p := fs.Int("p", 28080, "port")
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t := fs.String("t", "{{ . }}", "template")
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y := fs.String("y", "http://localhost:41912", "target")
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if err := fs.Parse(os.Args[1:]); err != nil {
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panic(err)
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}
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tmpl, err := template.New("").Parse(*t)
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if err != nil {
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panic(err)
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}
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u, err := url.Parse(*y)
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if err != nil {
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panic(err)
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}
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proxy := httputil.NewSingleHostReverseProxy(u)
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handle := func(w http.ResponseWriter, r *http.Request) error {
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var v interface{}
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if err := json.NewDecoder(r.Body).Decode(&v); err != nil {
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return err
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}
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buff := bytes.NewBuffer(nil)
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if err := tmpl.Execute(buff, v); err != nil {
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return err
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}
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r.Body = io.NopCloser(buff)
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r.ContentLength = int64(len(buff.Bytes()))
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proxy.ServeHTTP(w, r)
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return nil
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}
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log.Println("listening on", *p)
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if err := http.ListenAndServe(":"+strconv.Itoa(*p), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if err := handle(w, r); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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}
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})); err != nil {
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panic(err)
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}
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}
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