From 11966a356bf6a0d52a3f1a43c33985d89e9b0965 Mon Sep 17 00:00:00 2001
From: Christopher Tarry <chrisjtarry@gmail.com>
Date: Tue, 21 Dec 2021 12:31:54 -0500
Subject: [PATCH] allow specifying GUID and if no GUID is provided it remains
 relatively stable across runs

---
 client/client.go         | 18 +++++-------------
 go.mod                   |  1 +
 go.sum                   |  2 ++
 main.go                  | 24 ++++++++++++++++++++----
 widevine/cdm.go          |  5 +++--
 widevine/wv_proto2.pb.go |  5 +++--
 6 files changed, 34 insertions(+), 21 deletions(-)

diff --git a/client/client.go b/client/client.go
index dfd1c40..97e63de 100644
--- a/client/client.go
+++ b/client/client.go
@@ -9,12 +9,13 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"lukechampine.com/frand"
 	"net/http"
 	"net/url"
 	"strconv"
 	"strings"
 	"time"
+
+	"lukechampine.com/frand"
 )
 
 const (
@@ -30,24 +31,15 @@ type Client struct {
 
 // Returns a Client object that will use the provided Hulu session cookie to
 // interact with the Hulu API.
-func NewClient(c *http.Client, huluSession string) Client {
-	// they look something like 5E95F69687FDD039CD0388A39FC01E5A
-	huluGUID := func() (s string) {
-		c := []byte("ABCDEF0123456789")
-		for i := 0; i < 32; i++ {
-			s += string(c[frand.Intn(len(c))])
-		}
-		return
-	}()
-
+func NewClient(c *http.Client, huluSession, huluGUID string) Client {
 	return Client{c, huluSession, huluGUID}
 }
 
 // Returns a Client object using a default HTTP client with a timeout of 10s.
-func NewDefaultClient(huluSession string) Client {
+func NewDefaultClient(huluSession, huluGUID string) Client {
 	return NewClient(&http.Client{
 		Timeout: 10 * time.Second,
-	}, huluSession)
+	}, huluSession, huluGUID)
 }
 
 // Makes an HTTP request to a Hulu API endpoint.  The only cookie Hulu validates is
diff --git a/go.mod b/go.mod
index 83c537a..087cb61 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.16
 
 require (
 	github.com/aead/cmac v0.0.0-20160719120800-7af84192f0b1
+	github.com/google/uuid v1.3.0
 	golang.org/x/sys v0.0.0-20210423082822-04245dca01da // indirect
 	google.golang.org/protobuf v1.27.1
 	lukechampine.com/flagg v1.1.1
diff --git a/go.sum b/go.sum
index f866122..e2df567 100644
--- a/go.sum
+++ b/go.sum
@@ -5,6 +5,8 @@ github.com/aead/cmac v0.0.0-20160719120800-7af84192f0b1/go.mod h1:nuudZmJhzWtx22
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/main.go b/main.go
index 45af6ea..2cfedc0 100644
--- a/main.go
+++ b/main.go
@@ -2,16 +2,21 @@ package main
 
 import (
 	"bytes"
+	"crypto/md5"
 	"encoding/hex"
 	"fmt"
-	hulu "github.com/chris124567/hulu/client"
-	"github.com/chris124567/hulu/widevine"
 	"io"
-	"lukechampine.com/flagg"
 	"net/http"
 	"os"
+	"strings"
 	"text/tabwriter"
 	"time"
+
+	"github.com/google/uuid"
+
+	hulu "github.com/chris124567/hulu/client"
+	"github.com/chris124567/hulu/widevine"
+	"lukechampine.com/flagg"
 )
 
 func main() {
@@ -45,13 +50,24 @@ download [id] - prints the MPD url the video is available at and returns the mp4
 	}
 	cmd := flagg.Parse(tree)
 
+	huluGUID := os.Getenv("HULU_GUID")
+	// if GUID is not provided, use hash of hostname instead
+	if huluGUID == "" {
+		hostname, err := os.Hostname()
+		if err != nil {
+			panic(err)
+		}
+		uuid := uuid.UUID(md5.Sum([]byte(hostname)))
+		huluGUID = strings.ReplaceAll(strings.ToUpper(uuid.String()), "-", "")
+	}
+
 	huluSession := os.Getenv("HULU_SESSION")
 	if huluSession == "" {
 		rootCmd.Usage()
 		return
 	}
 
-	client := hulu.NewDefaultClient(huluSession)
+	client := hulu.NewDefaultClient(huluSession, huluGUID)
 	w := tabwriter.NewWriter(os.Stdout, 8, 8, 0, '\t', 0)
 	defer w.Flush()
 
diff --git a/widevine/cdm.go b/widevine/cdm.go
index b084ef3..3b1d53b 100644
--- a/widevine/cdm.go
+++ b/widevine/cdm.go
@@ -10,11 +10,12 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"errors"
+	"math"
+	"time"
+
 	"github.com/aead/cmac"
 	"google.golang.org/protobuf/proto"
 	"lukechampine.com/frand"
-	"math"
-	"time"
 )
 
 type CDM struct {
diff --git a/widevine/wv_proto2.pb.go b/widevine/wv_proto2.pb.go
index ccaccfa..c37d876 100644
--- a/widevine/wv_proto2.pb.go
+++ b/widevine/wv_proto2.pb.go
@@ -7,10 +7,11 @@
 package widevine
 
 import (
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
 	sync "sync"
+
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 )
 
 const (