Add README.md

collector/api.go

@@ -0,0 +1,77 @@
+package collector
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"golang.org/x/crypto/pbkdf2"
+	"io/ioutil"
+	"net/http"
+	"net/http/cookiejar"
+	"strings"
+	"time"
+)
+
+type VodafoneStation struct {
+	URL      string
+	Password string
+	client   *http.Client
+}
+
+type LoginResponse struct {
+	Error     string `json:"error"`
+	Salt      string `json:"salt"`
+	SaltWebUI string `json:"saltwebui"`
+}
+
+func NewVodafoneStation(url, password string) *VodafoneStation {
+	cookieJar, err := cookiejar.New(nil)
+	if err != nil {
+		panic(err)
+	}
+	return &VodafoneStation{
+		URL:      url,
+		Password: password,
+		client: &http.Client{
+			Jar:     cookieJar,
+			Timeout: time.Second * 2,
+		},
+	}
+}
+
+func (v *VodafoneStation) getLoginSalts() (*LoginResponse, error) {
+	requestBody := strings.NewReader("username=admin&password=seeksalthash")
+	response, err := v.client.Post(v.URL+"/api/v1/session/login", "application/x-www-form-urlencoded", requestBody)
+	if err != nil {
+		return nil, err
+	}
+	if response.Body != nil {
+		defer response.Body.Close()
+	}
+	responseBody, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+	loginResponse := &LoginResponse{}
+	err = json.Unmarshal(responseBody, loginResponse)
+	if err != nil {
+		return nil, err
+	}
+	if loginResponse.Error != "ok" {
+		return nil, fmt.Errorf("Got non error=ok message from vodafone station")
+	}
+	return loginResponse, nil
+}
+
+// GetLoginPassword derives the password using the given salts
+func GetLoginPassword(password, salt, saltWebUI string) string {
+	return DoPbkdf2NotCoded(DoPbkdf2NotCoded(password, salt), saltWebUI)
+}
+
+// Equivalent to the JS doPbkdf2NotCoded (see README.md)
+func DoPbkdf2NotCoded(key, salt string) string {
+	temp := pbkdf2.Key([]byte(key), []byte(salt), 0x3e8, 0x80, sha256.New)
+	fmt.Println(hex.EncodeToString(temp))
+	return hex.EncodeToString(temp[:16])
+}

collector/api_test.go

@@ -0,0 +1,20 @@
+package collector_test
+
+import (
+	"github.com/fluepke/vodafone-station-exporter/collector"
+	"testing"
+)
+
+func TestDoPbkdf2NotCoded(t *testing.T) {
+	result := collector.DoPbkdf2NotCoded("EqAM2KtT", "2awfm2st3cej")
+	if result != "c2523cb6738663f9d9223c905c59cbb6" {
+		t.Errorf("Got %s", result)
+	}
+}
+
+func TestGetLoginPassword(t *testing.T) {
+	loginPassword := collector.GetLoginPassword("EqAM2KtT", "2awfm2st3cej", "4hbeVQ1Z6HK2")
+	if loginPassword != "b000b59875d1dc81bcd9d8f658fc7e77" {
+		t.Errorf("Derivation of login password failed!")
+	}
+}