Merge pull request #113 from negz/dieutildie

Remove pkg/util

pkg/password/password.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2019 The Crossplane Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package password contains a simple password generator.
+package password
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+// Settings for password generation.
+type Settings struct {
+	// CharacterSet of allowed password characters.
+	CharacterSet string
+
+	// Length of generated passwords.
+	Length int
+}
+
+// Default password generation settings.
+var Default = Settings{
+	CharacterSet: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
+	Length:       27,
+}
+
+// Generate a random, 27 character password that may consist of lowercase
+// letters, uppercase letters, or numbers.
+func Generate() (string, error) {
+	return Default.Generate()
+}
+
+// Generate a password.
+func (s Settings) Generate() (string, error) {
+	pw := make([]byte, s.Length)
+	for i := 0; i < s.Length; i++ {
+		n, err := rand.Int(rand.Reader, big.NewInt(int64(len(s.CharacterSet))))
+		if err != nil {
+			return "", err
+		}
+		pw[i] = s.CharacterSet[n.Int64()]
+	}
+	return string(pw), nil
+}

pkg/password/password_test.go

@@ -0,0 +1,20 @@
+package password
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestGenerate(t *testing.T) {
+	// ¯\_(ツ)_/¯
+
+	want := "aaa"
+	got, err := Settings{CharacterSet: "a", Length: 3}.Generate()
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("Generate(): -want, +got:\n%s", diff)
+	}
+	if err != nil {
+		t.Errorf("Generate: %s\n", err)
+	}
+}