Implement credential programs reading from Stdin.

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

plugin/plugin_test.go

@@ -0,0 +1,142 @@
+package plugin
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/calavera/docker-credential-helpers/credentials"
+)
+
+type memoryStore struct {
+	creds map[string]*credentials.Credentials
+}
+
+func newMemoryStore() *memoryStore {
+	return &memoryStore{
+		creds: make(map[string]*credentials.Credentials),
+	}
+}
+
+func (m *memoryStore) Add(creds *credentials.Credentials) error {
+	m.creds[creds.ServerURL] = creds
+	return nil
+}
+
+func (m *memoryStore) Delete(serverURL string) error {
+	delete(m.creds, serverURL)
+	return nil
+}
+
+func (m *memoryStore) Get(serverURL string) (string, string, error) {
+	c, ok := m.creds[serverURL]
+	if !ok {
+		return "", "", fmt.Errorf("creds not found for %s", serverURL)
+	}
+	return c.Username, c.Password, nil
+}
+
+func TestStore(t *testing.T) {
+	serverURL := "https://index.docker.io/v1/"
+	creds := &credentials.Credentials{
+		ServerURL: serverURL,
+		Username:  "foo",
+		Password:  "bar",
+	}
+	b, err := json.Marshal(creds)
+	if err != nil {
+		t.Fatal(err)
+	}
+	in := bytes.NewReader(b)
+
+	h := newMemoryStore()
+	if err := store(h, in); err != nil {
+		t.Fatal(err)
+	}
+
+	c, ok := h.creds[serverURL]
+	if !ok {
+		t.Fatalf("creds not found for %s\n", serverURL)
+	}
+
+	if c.Username != "foo" {
+		t.Fatalf("expected username foo, got %s\n", c.Username)
+	}
+
+	if c.Password != "bar" {
+		t.Fatalf("expected username bar, got %s\n", c.Password)
+	}
+}
+
+func TestGet(t *testing.T) {
+	serverURL := "https://index.docker.io/v1/"
+	creds := &credentials.Credentials{
+		ServerURL: serverURL,
+		Username:  "foo",
+		Password:  "bar",
+	}
+	b, err := json.Marshal(creds)
+	if err != nil {
+		t.Fatal(err)
+	}
+	in := bytes.NewReader(b)
+
+	h := newMemoryStore()
+	if err := store(h, in); err != nil {
+		t.Fatal(err)
+	}
+
+	buf := strings.NewReader(serverURL)
+	w := new(bytes.Buffer)
+	if err := get(h, buf, w); err != nil {
+		t.Fatal(err)
+	}
+
+	if w.Len() == 0 {
+		t.Fatalf("expected output in the writer, got %d", w.Len())
+	}
+
+	var c credentialsGetResponse
+	if err := json.NewDecoder(w).Decode(&c); err != nil {
+		t.Fatal(err)
+	}
+
+	if c.Username != "foo" {
+		t.Fatalf("expected username foo, got %s\n", c.Username)
+	}
+
+	if c.Password != "bar" {
+		t.Fatalf("expected username bar, got %s\n", c.Password)
+	}
+}
+
+func TestErase(t *testing.T) {
+	serverURL := "https://index.docker.io/v1/"
+	creds := &credentials.Credentials{
+		ServerURL: serverURL,
+		Username:  "foo",
+		Password:  "bar",
+	}
+	b, err := json.Marshal(creds)
+	if err != nil {
+		t.Fatal(err)
+	}
+	in := bytes.NewReader(b)
+
+	h := newMemoryStore()
+	if err := store(h, in); err != nil {
+		t.Fatal(err)
+	}
+
+	buf := strings.NewReader(serverURL)
+	if err := erase(h, buf); err != nil {
+		t.Fatal(err)
+	}
+
+	w := new(bytes.Buffer)
+	if err := get(h, buf, w); err == nil {
+		t.Fatal("expected error getting missing creds, got empty")
+	}
+}