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Remove padding on example client PKCE #276

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Remove padding on example client PKCE #276

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315d054
Remove padding on example client PKCE
coryschwartz Feb 14, 2025
380fcc3
use raw encoding
coryschwartz Feb 14, 2025
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282 changes: 141 additions & 141 deletions example/client/client.go
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Original file line number Diff line number Diff line change
@@ -1,141 +1,141 @@
package main

import (
"context"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"time"

"golang.org/x/oauth2"
"golang.org/x/oauth2/clientcredentials"
)

const (
authServerURL = "http://localhost:9096"
)

var (
config = oauth2.Config{
ClientID: "222222",
ClientSecret: "22222222",
Scopes: []string{"all"},
RedirectURL: "http://localhost:9094/oauth2",
Endpoint: oauth2.Endpoint{
AuthURL: authServerURL + "/oauth/authorize",
TokenURL: authServerURL + "/oauth/token",
},
}
globalToken *oauth2.Token // Non-concurrent security
)

func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
u := config.AuthCodeURL("xyz",
oauth2.SetAuthURLParam("code_challenge", genCodeChallengeS256("s256example")),
oauth2.SetAuthURLParam("code_challenge_method", "S256"))
http.Redirect(w, r, u, http.StatusFound)
})

http.HandleFunc("/oauth2", func(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
state := r.Form.Get("state")
if state != "xyz" {
http.Error(w, "State invalid", http.StatusBadRequest)
return
}
code := r.Form.Get("code")
if code == "" {
http.Error(w, "Code not found", http.StatusBadRequest)
return
}
token, err := config.Exchange(context.Background(), code, oauth2.SetAuthURLParam("code_verifier", "s256example"))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
globalToken = token

e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})

http.HandleFunc("/refresh", func(w http.ResponseWriter, r *http.Request) {
if globalToken == nil {
http.Redirect(w, r, "/", http.StatusFound)
return
}

globalToken.Expiry = time.Now()
token, err := config.TokenSource(context.Background(), globalToken).Token()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}

globalToken = token
e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})

http.HandleFunc("/try", func(w http.ResponseWriter, r *http.Request) {
if globalToken == nil {
http.Redirect(w, r, "/", http.StatusFound)
return
}

resp, err := http.Get(fmt.Sprintf("%s/test?access_token=%s", authServerURL, globalToken.AccessToken))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
defer resp.Body.Close()

io.Copy(w, resp.Body)
})

http.HandleFunc("/pwd", func(w http.ResponseWriter, r *http.Request) {
token, err := config.PasswordCredentialsToken(context.Background(), "test", "test")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}

globalToken = token
e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})

http.HandleFunc("/client", func(w http.ResponseWriter, r *http.Request) {
cfg := clientcredentials.Config{
ClientID: config.ClientID,
ClientSecret: config.ClientSecret,
TokenURL: config.Endpoint.TokenURL,
}

token, err := cfg.Token(context.Background())
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}

e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})

log.Println("Client is running at 9094 port.Please open http://localhost:9094")
log.Fatal(http.ListenAndServe(":9094", nil))
}

func genCodeChallengeS256(s string) string {
s256 := sha256.Sum256([]byte(s))
return base64.URLEncoding.EncodeToString(s256[:])
}
package main
import (
"context"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/clientcredentials"
)
const (
authServerURL = "http://localhost:9096"
)
var (
config = oauth2.Config{
ClientID: "222222",
ClientSecret: "22222222",
Scopes: []string{"all"},
RedirectURL: "http://localhost:9094/oauth2",
Endpoint: oauth2.Endpoint{
AuthURL: authServerURL + "/oauth/authorize",
TokenURL: authServerURL + "/oauth/token",
},
}
globalToken *oauth2.Token // Non-concurrent security
)
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
u := config.AuthCodeURL("xyz",
oauth2.SetAuthURLParam("code_challenge", genCodeChallengeS256("s256example")),
oauth2.SetAuthURLParam("code_challenge_method", "S256"))
http.Redirect(w, r, u, http.StatusFound)
})
http.HandleFunc("/oauth2", func(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
state := r.Form.Get("state")
if state != "xyz" {
http.Error(w, "State invalid", http.StatusBadRequest)
return
}
code := r.Form.Get("code")
if code == "" {
http.Error(w, "Code not found", http.StatusBadRequest)
return
}
token, err := config.Exchange(context.Background(), code, oauth2.SetAuthURLParam("code_verifier", "s256example"))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
globalToken = token
e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})
http.HandleFunc("/refresh", func(w http.ResponseWriter, r *http.Request) {
if globalToken == nil {
http.Redirect(w, r, "/", http.StatusFound)
return
}
globalToken.Expiry = time.Now()
token, err := config.TokenSource(context.Background(), globalToken).Token()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
globalToken = token
e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})
http.HandleFunc("/try", func(w http.ResponseWriter, r *http.Request) {
if globalToken == nil {
http.Redirect(w, r, "/", http.StatusFound)
return
}
resp, err := http.Get(fmt.Sprintf("%s/test?access_token=%s", authServerURL, globalToken.AccessToken))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
defer resp.Body.Close()
io.Copy(w, resp.Body)
})
http.HandleFunc("/pwd", func(w http.ResponseWriter, r *http.Request) {
token, err := config.PasswordCredentialsToken(context.Background(), "test", "test")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
globalToken = token
e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})
http.HandleFunc("/client", func(w http.ResponseWriter, r *http.Request) {
cfg := clientcredentials.Config{
ClientID: config.ClientID,
ClientSecret: config.ClientSecret,
TokenURL: config.Endpoint.TokenURL,
}
token, err := cfg.Token(context.Background())
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
e := json.NewEncoder(w)
e.SetIndent("", " ")
e.Encode(token)
})
log.Println("Client is running at 9094 port.Please open http://localhost:9094")
log.Fatal(http.ListenAndServe(":9094", nil))
}
func genCodeChallengeS256(s string) string {
s256 := sha256.Sum256([]byte(s))
return base64.RawURLEncoding.EncodeToString(s256[:])
}