handlers.go

package server

import (
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"html/template"
	"io"
	"log"
	"net/http"
	"strconv"
	"strings"

	"github.com/gorilla/csrf"
	"github.com/nsheridan/cashier/lib"
	"github.com/nsheridan/cashier/server/store"
	"github.com/nsheridan/cashier/server/templates"
	"github.com/pkg/errors"
	"golang.org/x/oauth2"
)

func (a *app) sign(w http.ResponseWriter, r *http.Request) {
	var t string
	if ah := r.Header.Get("Authorization"); ah != "" {
		if len(ah) > 6 && strings.ToUpper(ah[0:7]) == "BEARER " {
			t = ah[7:]
		}
	}

	token := &oauth2.Token{
		AccessToken: t,
	}
	if !a.authprovider.Valid(token) {
		w.WriteHeader(http.StatusUnauthorized)
		fmt.Fprint(w, http.StatusText(http.StatusUnauthorized))
		return
	}

	// Sign the pubkey and issue the cert.
	req := &lib.SignRequest{}
	if err := json.NewDecoder(r.Body).Decode(req); err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusBadRequest)
		fmt.Fprint(w, http.StatusText(http.StatusBadRequest))
		return
	}

	if a.requireReason && req.Message == "" {
		w.Header().Add("X-Need-Reason", "required")
		w.WriteHeader(http.StatusForbidden)
		fmt.Fprint(w, http.StatusText(http.StatusForbidden))
		return
	}

	username := a.authprovider.Username(token)
	a.authprovider.Revoke(token) // We don't need this anymore.
	cert, err := a.keysigner.SignUserKey(req, username)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		fmt.Fprintf(w, "Error signing key")
		return
	}

	rec := store.MakeRecord(cert)
	rec.Message = req.Message
	if err := a.certstore.SetRecord(rec); err != nil {
		log.Printf("Error recording cert: %v", err)
	}
	if err := json.NewEncoder(w).Encode(&lib.SignResponse{