add file upload specification

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"github.com/joho/godotenv"
 	"log"
 	"os"
@@ -9,13 +10,58 @@ import (
 	"github.com/minio/minio-go/v7/pkg/credentials"
 )
 
+const (
+	ENDPOINT   = "s3.us-west-004.backblazeb2.com"
+	BUCKETNAME = "ducimon-db-backups"
+)
+
 func main() {
 
+	ctx := context.Background()
 	accessKeyID, secretAccessKey := getCredentials()
-	endpoint := "s3.us-west-002.backblazeb2.com"
+	client := createClient(accessKeyID, secretAccessKey)
+	verifyBucket(client, ctx)
+	absolutePath, basename := validateUploadFile()
 
+	_, err := client.FPutObject(ctx, BUCKETNAME, "test", absolutePath, minio.PutObjectOptions{})
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	log.Printf("upload of %s complete\n", basename)
+}
+
+func validateUploadFile() (string, string) {
+	if len(os.Args) < 2 {
+		log.Fatalln("upload file not specified")
+	}
+
+	file, err := os.Stat(os.Args[1])
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	if file.IsDir() {
+		log.Fatalln("upload of directories is not supported")
+	}
+
+	return os.Args[1], file.Name()
+}
+
+func verifyBucket(client *minio.Client, ctx context.Context) {
+	exists, err := client.BucketExists(ctx, BUCKETNAME)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	if !exists {
+		log.Fatalf("bucket %s does not exist\n", BUCKETNAME)
+	}
+}
+
+func createClient(accessKeyID string, secretAccessKey string) *minio.Client {
 	// Initialize minio client object.
-	minioClient, err := minio.New(endpoint, &minio.Options{
+	minioClient, err := minio.New(ENDPOINT, &minio.Options{
 		Creds:  credentials.NewStaticV4(accessKeyID, secretAccessKey, ""),
 		Secure: true,
 	})
@@ -23,7 +69,7 @@ func main() {
 		log.Fatalln(err)
 	}
 
-	log.Printf("%#v\n", minioClient) // minioClient is now set up
+	return minioClient
 }
 
 func getCredentials() (string, string) {
@@ -32,9 +78,9 @@ func getCredentials() (string, string) {
 	if err != nil {
 		log.Fatalf("error loading .env file: (%s)", err.Error())
 	}
-	keyName := os.Getenv("KEY_NAME")
+	keyName := os.Getenv("KEY_ID")
 	if keyName == "" {
-		log.Fatal("missing or empty KEY_NAME")
+		log.Fatal("missing or empty KEY_ID")
 	}
 	applicationKey := os.Getenv("APPLICATION_KEY")
 	if applicationKey == "" {