From b84ca16ba73b56229b3c99dc2a9dd61508519c5e Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Tue, 29 Dec 2015 04:04:07 +0100
Subject: improved session id generation with less deps


diff --git a/Makefile b/Makefile
index 458df9c..87b00fc 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,6 @@ getlibs:
 	$(GOCMD) get "github.com/vaughan0/go-ini"
 	$(GOCMD) get "github.com/ziutek/mymysql/godrv"
 	$(GOCMD) get "github.com/golang-basic/go-curl"
-	$(GOCMD) get "github.com/satori/go.uuid"
 	$(GOCMD) get "github.com/spreadspace/telgo"
 	$(GOCMD) get "github.com/gorilla/websocket"
 
diff --git a/src/helsinki.at/rhimport/session_store.go b/src/helsinki.at/rhimport/session_store.go
index b7ea3d9..5025d8c 100644
--- a/src/helsinki.at/rhimport/session_store.go
+++ b/src/helsinki.at/rhimport/session_store.go
@@ -25,11 +25,10 @@
 package rhimport
 
 import (
-	"encoding/base32"
+	"crypto/rand"
+	"encoding/base64"
 	"fmt"
-	"github.com/satori/go.uuid"
 	"net/http"
-	"strings"
 )
 
 type newSessionResponse struct {
@@ -76,6 +75,14 @@ type SessionStore struct {
 	removeChan chan removeSessionRequest
 }
 
+func generateSessionId() (string, error) {
+	var b [32]byte
+	if _, err := rand.Read(b[:]); err != nil {
+		return "", err
+	}
+	return base64.RawStdEncoding.EncodeToString(b[:]), nil
+}
+
 func (self *SessionStore) new(ctx *ImportContext) (resp newSessionResponse) {
 	resp.responsecode = http.StatusOK
 	resp.errorstring = "OK"
@@ -90,14 +97,18 @@ func (self *SessionStore) new(ctx *ImportContext) (resp newSessionResponse) {
 			return
 		}
 	}
-	b := uuid.NewV4().Bytes()
-	resp.id = strings.ToLower(strings.TrimRight(base32.StdEncoding.EncodeToString(b), "="))
-	if _, exists := self.store[ctx.UserName]; !exists {
-		self.store[ctx.UserName] = make(map[string]*Session)
+	if id, err := generateSessionId(); err != nil {
+		resp.responsecode = http.StatusInternalServerError
+		resp.errorstring = err.Error()
+	} else {
+		resp.id = id
+		if _, exists := self.store[ctx.UserName]; !exists {
+			self.store[ctx.UserName] = make(map[string]*Session)
+		}
+		self.store[ctx.UserName][resp.id] = NewSession(ctx, func() { self.GetInterface().Remove(ctx.UserName, resp.id) })
+		resp.session = self.store[ctx.UserName][resp.id].getInterface()
+		rhdl.Printf("SessionStore: created session for '%s' -> %s", ctx.UserName, resp.id)
 	}
-	self.store[ctx.UserName][resp.id] = NewSession(ctx, func() { self.GetInterface().Remove(ctx.UserName, resp.id) })
-	resp.session = self.store[ctx.UserName][resp.id].getInterface()
-	rhdl.Printf("SessionStore: created session for '%s' -> %s", ctx.UserName, resp.id)
 	return
 }
 
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