Remove command close #3

- Created a new command that allow the possibility to remove one or more key
- Updated README

.travis.yml

@@ -11,7 +11,7 @@ env:
 # You don't need to test on very old version of the Go compiler. It's the user's
 # responsibility to keep their compilers up to date.
 go:
-  - 1.11.x
+  - 1.16.x
 
 # Only clone the most recent commit.
 git:

README.md

@@ -44,7 +44,7 @@ storage := &StorageClient{
 }
 ```
 
-### SDK
+### Create a new instance
 Create a new SDK instance
 ```go
 avocado := sdk.Avocado{}
@@ -69,4 +69,9 @@ decryptedValue, err := avocado.FindAndDecryptValueBy([]byte("key1"), "/path/to/m
 #### Get all keys
 ```go
 keys, err := avocado.GetAllKeys()
+```
+
+#### Remove a key
+```go
+err := avocado.Delete([]byte("key1"))
 ```

go.mod

@@ -0,0 +1,10 @@
+module github.com/lorenzodisidoro/avocado-sdk
+
+go 1.16
+
+require (
+	github.com/go-redis/redis v6.15.9+incompatible
+	github.com/lorenzodisidoro/rsa-oaep v0.0.0-20200423211322-d3f395cafccd
+	github.com/onsi/gomega v1.12.0 // indirect
+	go.etcd.io/bbolt v1.3.5
+)

go.sum

@@ -0,0 +1,97 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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main.go

@@ -6,17 +6,17 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"errors"
-	"fmt"
 	"io/ioutil"
 
 	oaep "github.com/lorenzodisidoro/rsa-oaep"
 )
 
 // Error messages
 var (
-	ErrorFilePathNotProvided = errors.New("File path not provided")
-	ErrorValueNotProvided    = errors.New("Value not provided")
-	ErrorKeyNotProvided      = errors.New("Value label not provided")
+	ErrorFilePathNotProvided    = errors.New("file path not provided")
+	ErrorValueNotProvided       = errors.New("value not provided")
+	ErrorKeyNotProvided         = errors.New("value label not provided")
+	ErrorEncryptedValueNotFound = errors.New("encrypted value not found")
 )
 
 // Avocado defines RSA keys and storage configurations
@@ -75,6 +75,10 @@ func (a *Avocado) FindAndDecryptValueBy(key []byte, privateKeyPath string) ([]by
 		return nil, err
 	}
 
+	if encryptedValue == nil {
+		return nil, ErrorEncryptedValueNotFound
+	}
+
 	privateKey, err := getPrivateKeyFromFile(privateKeyPath)
 	if err != nil {
 		return nil, err
@@ -83,7 +87,6 @@ func (a *Avocado) FindAndDecryptValueBy(key []byte, privateKeyPath string) ([]by
 	oaep := oaep.NewRSAOaep(sha256.New())
 	decriptedValue, err := oaep.Dencrypt(privateKey, encryptedValue, key)
 	if err != nil {
-		fmt.Println("Error occurred:", err)
 		return nil, err
 	}
 
@@ -96,6 +99,12 @@ func (a *Avocado) GetAllKeys() ([][]byte, error) {
 	return a.storage.getAll()
 }
 
+// Delete remove a key
+// @return error
+func (a *Avocado) Delete(key []byte) error {
+	return a.storage.delete(key)
+}
+
 // readFile data from file
 func readFile(path string) ([]byte, error) {
 	contentByte, err := ioutil.ReadFile(path)

main_test.go

@@ -109,6 +109,16 @@ func TestEncryptDecryptMessage(t *testing.T) {
 	if string(valueDecrypted) != value1 {
 		t.Fatal("Should be expected message equals to ", value1)
 	}
+
+	err = avocado.Delete([]byte(key1))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = avocado.FindAndDecryptValueBy([]byte(key1), privateKeyPath)
+	if err == nil {
+		t.Fatal("The error should be ", ErrorEncryptedValueNotFound)
+	}
 }
 
 // privateKeyToBytes converts a private key to bytes form

storage.go

@@ -38,7 +38,7 @@ type StorageClient struct {
 func (sc *StorageClient) New() error {
 
 	if sc.Bbolt != nil && sc.Redis != nil {
-		return errors.New("Is not possible instantiate more than one storage client")
+		return errors.New("is not possible instantiate more than one storage client")
 	}
 
 	if sc.Redis != nil {
@@ -73,7 +73,7 @@ func (sc *StorageClient) getAll() ([][]byte, error) {
 			return nil, err
 		}
 
-		bboltClient.View(func(tx *bolt.Tx) error {
+		err = bboltClient.View(func(tx *bolt.Tx) error {
 			b := tx.Bucket([]byte(sc.Bbolt.BucketName))
 			if b != nil {
 				c := b.Cursor()
@@ -85,7 +85,8 @@ func (sc *StorageClient) getAll() ([][]byte, error) {
 			return nil
 		})
 
-		bboltClient.Close()
+		defer bboltClient.Close()
+		return keys, err
 	}
 
 	if sc.Redis != nil && sc.Redis.client != nil {
@@ -116,10 +117,10 @@ func (sc *StorageClient) get(key []byte) ([]byte, error) {
 			return nil, err
 		}
 
-		bboltClient.View(func(tx *bolt.Tx) error {
+		err = bboltClient.View(func(tx *bolt.Tx) error {
 			bucket := tx.Bucket([]byte(sc.Bbolt.BucketName))
 			if bucket == nil {
-				err = fmt.Errorf("Bucket %q not found", sc.Bbolt.BucketName)
+				err = fmt.Errorf("bucket %q not found", sc.Bbolt.BucketName)
 				return err
 			}
 
@@ -128,7 +129,8 @@ func (sc *StorageClient) get(key []byte) ([]byte, error) {
 			return nil
 		})
 
-		bboltClient.Close()
+		defer bboltClient.Close()
+		return value, err
 	}
 
 	if sc.Redis != nil && sc.Redis.client != nil {
@@ -143,6 +145,40 @@ func (sc *StorageClient) get(key []byte) ([]byte, error) {
 	return value, err
 }
 
+func (sc *StorageClient) delete(key []byte) error {
+
+	if sc.Bbolt != nil {
+		bboltClient, err := bolt.Open(sc.Bbolt.SotoragePath, sc.Bbolt.client.mode, sc.Bbolt.client.options)
+		if err != nil {
+			return err
+		}
+
+		err = bboltClient.Update(func(tx *bolt.Tx) error {
+			bucket := tx.Bucket([]byte(sc.Bbolt.BucketName))
+			if bucket == nil {
+				err = fmt.Errorf("bucket %q not found", sc.Bbolt.BucketName)
+				return err
+			}
+
+			err = bucket.Delete(key)
+
+			return err
+		})
+
+		defer bboltClient.Close()
+		return err
+	}
+
+	if sc.Redis != nil && sc.Redis.client != nil {
+		err := sc.Redis.client.Del(string(key)).Err()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 // Set put new key value pair
 func (sc *StorageClient) set(key, value []byte) error {
 	if sc.Bbolt != nil {
@@ -164,7 +200,7 @@ func (sc *StorageClient) set(key, value []byte) error {
 			return nil
 		})
 
-		bboltClient.Close()
+		defer bboltClient.Close()
 
 		return err
 	}