Remove extra package.

Signed-off-by: David Calavera <david.calavera@gmail.com>

credentials/credentials.go

@@ -0,0 +1,110 @@
+package credentials
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+type credentialsGetResponse struct {
+	Username string
+	Password string
+}
+
+// Serve initializes the credentials helper and parses the action argument.
+func Serve(helper Helper) {
+	if err := handleCommand(helper); err != nil {
+		fmt.Fprintf(os.Stdout, "%v\n", err)
+		os.Exit(1)
+	}
+}
+
+func handleCommand(helper Helper) error {
+	if len(os.Args) != 2 {
+		return fmt.Errorf("Usage: %s <store|get|erase>", os.Args[0])
+	}
+
+	switch os.Args[1] {
+	case "store":
+		return store(helper, os.Stdin)
+	case "get":
+		return get(helper, os.Stdin, os.Stdout)
+	case "erase":
+		return erase(helper, os.Stdin)
+	}
+	return fmt.Errorf("Usage: %s <store|get|erase>", os.Args[0])
+}
+
+func store(helper Helper, reader io.Reader) error {
+	scanner := bufio.NewScanner(reader)
+
+	buffer := new(bytes.Buffer)
+	for scanner.Scan() {
+		buffer.Write(scanner.Bytes())
+	}
+
+	if err := scanner.Err(); err != nil && err != io.EOF {
+		return err
+	}
+
+	var creds Credentials
+	if err := json.NewDecoder(buffer).Decode(&creds); err != nil {
+		return err
+	}
+
+	return helper.Add(&creds)
+}
+
+func get(helper Helper, reader io.Reader, writer io.Writer) error {
+	scanner := bufio.NewScanner(reader)
+
+	buffer := new(bytes.Buffer)
+	for scanner.Scan() {
+		buffer.Write(scanner.Bytes())
+	}
+
+	if err := scanner.Err(); err != nil && err != io.EOF {
+		return err
+	}
+
+	serverURL := strings.TrimSpace(buffer.String())
+
+	username, password, err := helper.Get(serverURL)
+	if err != nil {
+		return err
+	}
+
+	resp := credentialsGetResponse{
+		Username: username,
+		Password: password,
+	}
+
+	buffer.Reset()
+	if err := json.NewEncoder(buffer).Encode(resp); err != nil {
+		return err
+	}
+
+	fmt.Fprint(writer, buffer.String())
+	return nil
+}
+
+func erase(helper Helper, reader io.Reader) error {
+	scanner := bufio.NewScanner(reader)
+
+	buffer := new(bytes.Buffer)
+	for scanner.Scan() {
+		buffer.Write(scanner.Bytes())
+	}
+
+	if err := scanner.Err(); err != nil && err != io.EOF {
+		return err
+	}
+
+	serverURL := strings.TrimSpace(buffer.String())
+
+	return helper.Delete(serverURL)
+}