From 92f2bd3d09cdc87223c0e73e76d8741ce39f4d73 Mon Sep 17 00:00:00 2001
From: andig <cpuidle@gmx.de>
Date: Sun, 13 Sep 2020 16:09:03 +0200
Subject: [PATCH] Download Tesla client id/secret if not configured (#332)

* Download client id/secret if not configured

* Change email to user to align with other vehicle apis
---
 go.mod           |  1 +
 vehicle/tesla.go | 37 ++++++++++++++++++++++++++++++-------
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/go.mod b/go.mod
index 78763413b..9c6999670 100644
--- a/go.mod
+++ b/go.mod
@@ -40,5 +40,6 @@ require (
 	github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e
 	github.com/volkszaehler/mbmd v0.0.0-20200831092453-b235d6a65b21
 	golang.org/x/net v0.0.0-20200707034311-ab3426394381
+	gopkg.in/ini.v1 v1.57.0
 	gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c
 )
diff --git a/vehicle/tesla.go b/vehicle/tesla.go
index 9bb5c9d1d..0ce56ef13 100644
--- a/vehicle/tesla.go
+++ b/vehicle/tesla.go
@@ -2,12 +2,14 @@ package vehicle
 
 import (
 	"errors"
+	"net/http"
 	"time"
 
 	"github.com/andig/evcc/api"
 	"github.com/andig/evcc/provider"
 	"github.com/andig/evcc/util"
 	"github.com/jsgoecke/tesla"
+	"gopkg.in/ini.v1"
 )
 
 // Tesla is an api.Vehicle implementation for Tesla cars
@@ -28,19 +30,27 @@ func NewTeslaFromConfig(other map[string]interface{}) (api.Vehicle, error) {
 		Title                  string
 		Capacity               int64
 		ClientID, ClientSecret string
-		Email, Password        string
+		User, Password         string
 		VIN                    string
 		Cache                  time.Duration
 	}{}
-
 	if err := util.DecodeOther(other, &cc); err != nil {
 		return nil, err
 	}
 
+	v := &Tesla{
+		embed: &embed{cc.Title, cc.Capacity},
+	}
+
+	if cc.ClientID == "" {
+		// https://tesla-api.timdorr.com/api-basics/authentication
+		cc.ClientID, cc.ClientSecret = v.downloadClientID("https://pastebin.com/raw/pS7Z6yyP")
+	}
+
 	client, err := tesla.NewClient(&tesla.Auth{
 		ClientID:     cc.ClientID,
 		ClientSecret: cc.ClientSecret,
-		Email:        cc.Email,
+		Email:        cc.User,
 		Password:     cc.Password,
 	})
 	if err != nil {
@@ -52,10 +62,6 @@ func NewTeslaFromConfig(other map[string]interface{}) (api.Vehicle, error) {
 		return nil, err
 	}
 
-	v := &Tesla{
-		embed: &embed{cc.Title, cc.Capacity},
-	}
-
 	if cc.VIN == "" && len(vehicles) == 1 {
 		v.vehicle = vehicles[0].Vehicle
 	} else {
@@ -76,6 +82,23 @@ func NewTeslaFromConfig(other map[string]interface{}) (api.Vehicle, error) {
 	return v, nil
 }
 
+// download client id and secret
+func (v *Tesla) downloadClientID(uri string) (string, string) {
+	resp, err := http.Get(uri)
+	if err == nil {
+		defer resp.Body.Close()
+
+		cfg, err := ini.Load(resp.Body)
+		if err == nil {
+			id := cfg.Section("").Key("TESLA_CLIENT_ID").String()
+			secret := cfg.Section("").Key("TESLA_CLIENT_SECRET").String()
+			return id, secret
+		}
+	}
+
+	return "", ""
+}
+
 // chargeState implements the Vehicle.ChargeState interface
 func (v *Tesla) chargeState() (float64, error) {
 	state, err := v.vehicle.ChargeState()