rewrite getCredentials to be more generic

main.go

@@ -1,44 +1,43 @@
 package main
 
 import (
-	"github.com/joho/godotenv"
+	"backup-tool/s3helper"
+	"context"
+	"fmt"
 	"log"
 	"os"
 
-	"github.com/minio/minio-go/v7"
-	"github.com/minio/minio-go/v7/pkg/credentials"
+	"github.com/joho/godotenv"
 )
 
 func main() {
 
-	accessKeyID, secretAccessKey := getCredentials()
-	endpoint := "s3.us-west-002.backblazeb2.com"
-
-	// Initialize minio client object.
-	minioClient, err := minio.New(endpoint, &minio.Options{
-		Creds:  credentials.NewStaticV4(accessKeyID, secretAccessKey, ""),
-		Secure: true,
-	})
-	if err != nil {
-		log.Fatalln(err)
-	}
-
-	log.Printf("%#v\n", minioClient) // minioClient is now set up
-}
-
-func getCredentials() (string, string) {
-	// get credentials from env vars
 	err := godotenv.Load()
 	if err != nil {
 		log.Fatalf("error loading .env file: (%s)", err.Error())
 	}
-	keyName := os.Getenv("KEY_NAME")
-	if keyName == "" {
-		log.Fatal("missing or empty KEY_NAME")
+
+	if len(os.Args) > 1 {
+		// only do this if we have been given a file to upload (for now)
+		// TODO: have this tool take the backup of the DB itself
+		b2Creds, err := getCredentials([]string{"B2_KEY_ID", "B2_APPLICATION_KEY"})
+		if err != nil {
+			log.Fatalf("could not get B2 credentials: %s", err)
+		}
+		s3helper.UploadFile(context.Background(), b2Creds)
 	}
-	applicationKey := os.Getenv("APPLICATION_KEY")
-	if applicationKey == "" {
-		log.Fatal("missing or empty APPLICATION_KEY")
-	}
-	return keyName, applicationKey
+
+}
+
+func getCredentials(credNames []string) (map[string]string, error) {
+	creds := map[string]string{}
+	for _, name := range credNames {
+		value := os.Getenv(name)
+		if value == "" {
+			return nil, fmt.Errorf("missing or empty ENV var: %s", name)
+		}
+		creds[name] = value
+	}
+
+	return creds, nil
 }

s3helper/s3helper.go

@@ -0,0 +1,72 @@
+package s3helper
+
+import (
+	"context"
+	"log"
+	"os"
+
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+)
+
+const (
+	ENDPOINT   = "s3.us-west-004.backblazeb2.com"
+	BUCKETNAME = "ducimon-db-backups"
+)
+
+func UploadFile(ctx context.Context, b2Creds map[string]string) error {
+
+	client := createClient(b2Creds["B2_KEY_ID"], b2Creds["B2_APPLICATION_KEY"])
+	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)
+
+	return nil
+}
+
+func createClient(accessKeyID string, secretAccessKey string) *minio.Client {
+	// Initialize minio client object.
+	minioClient, err := minio.New(ENDPOINT, &minio.Options{
+		Creds:  credentials.NewStaticV4(accessKeyID, secretAccessKey, ""),
+		Secure: true,
+	})
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	return minioClient
+}
+
+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 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()
+}