Align STS web-identity code snippet to documentation (minio#9114) (#9130)

docs/sts/keycloak.md

@@ -39,15 +39,19 @@ $ go run docs/sts/web-identity.go -cid account -csec 072e7f00-4289-469c-9ab2-bbe
 2018/12/26 17:49:36 listening on http://localhost:8888/
 ```
 
-This will open the login page of keycloak, upon successful login, STS credentials will be printed on the screen, for example
+This will open the login page of keycloak, upon successful login, STS credentials along with any buckets discovered using the credentials will be printed on the screen, for example:
 
 ```
-##### Credentials
 {
-	"accessKey": "6N2BALX7ELO827DXS3GK",
+  "buckets": [
-	"secretKey": "23JKqAD+um8ObHqzfIh+bfqwG9V8qs9tFY6MqeFR",
+    "bucket-x"
-	"expiration": "2019-10-01T07:22:34Z",
+  ],
-	"sessionToken": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.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._UG_-ZHgwdRnsp0gFdwChb7VlbPs-Gr_RNUz9EV7TggCD59qjCFAKjNrVHfOSVkKvYEMe0PvwfRKjnJl3A_mBA"
+  "credentials": {
+    "AccessKeyID": "6N2BALX7ELO827DXS3GK",
+    "SecretAccessKey": "23JKqAD+um8ObHqzfIh+bfqwG9V8qs9tFY6MqeFR+xxx",
+    "SessionToken": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.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._UG_-ZHgwdRnsp0gFdwChb7VlbPs-Gr_RNUz9EV7TggCD59qjCFAKjNrVHfOSVkKvYEMe0PvwfRKjnJl3A_mBA"",
+    "SignerType": 1
+  }
 }
 ```
 

docs/sts/web-identity.go

@@ -143,6 +143,7 @@ func main() {
 
 	ddoc, err := parseDiscoveryDoc(configEndpoint)
 	if err != nil {
+		log.Println(fmt.Errorf("Failed to parse OIDC discovery document %s", err))
 		fmt.Println(err)
 		return
 	}
@@ -163,10 +164,16 @@ func main() {
 	state := randomState()
 
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("%s %s", r.Method, r.RequestURI)
+		if r.RequestURI != "/" {
+			http.NotFound(w, r)
+			return
+		}
 		http.Redirect(w, r, config.AuthCodeURL(state), http.StatusFound)
 	})
 
 	http.HandleFunc("/oauth2/callback", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("%s %s", r.Method, r.RequestURI)
 		if r.URL.Query().Get("state") != state {
 			http.Error(w, "state did not match", http.StatusBadRequest)
 			return
@@ -189,13 +196,11 @@ func main() {
 
 		sts, err := credentials.NewSTSWebIdentity(stsEndpoint, getWebTokenExpiry)
 		if err != nil {
+			log.Println(fmt.Errorf("Could not get STS credentials: %s", err))
 			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
 
-		// Uncomment this to use MinIO API operations by initializing minio
-		// client with obtained credentials.
-
 		opts := &minio.Options{
 			Creds:        sts,
 			BucketLookup: minio.BucketLookupAuto,
@@ -203,23 +208,40 @@ func main() {
 
 		u, err := url.Parse(stsEndpoint)
 		if err != nil {
+			log.Println(fmt.Errorf("Failed to parse STS Endpoint: %s", err))
 			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
 
 		clnt, err := minio.NewWithOptions(u.Host, opts)
 		if err != nil {
+			log.Println(fmt.Errorf("Error while initializing Minio client, %s", err))
 			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
 		buckets, err := clnt.ListBuckets()
 		if err != nil {
+			log.Println(fmt.Errorf("Error while listing buckets, %s", err))
 			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
+		creds, _ := sts.Get()
+
+		bucketNames := []string{}
+
 		for _, bucket := range buckets {
-			log.Println(bucket)
+			log.Println(fmt.Sprintf("Bucket discovered: %s", bucket.Name))
+			bucketNames = append(bucketNames, bucket.Name)
+		}
+		response := make(map[string]interface{})
+		response["credentials"] = creds
+		response["buckets"] = bucketNames
+		c, err := json.MarshalIndent(response, "", "\t")
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
 		}
+		w.Write(c)
 	})
 
 	address := fmt.Sprintf("localhost:%v", port)