password generator (#395)

password/handler/password.go

@@ -0,0 +1,49 @@
+package handler
+
+import (
+	"context"
+	"crypto/rand"
+
+	pb "github.com/micro/services/password/proto"
+)
+
+
+var (
+	minLength = 8
+
+	special = "!@#$%&*"
+	numbers = "0123456789"
+	lowercase = "abcdefghijklmnopqrstuvwxyz"
+	uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	allChars = special + numbers + lowercase + uppercase
+)
+
+func random(chars string, i int) string {
+        bytes := make([]byte, i)
+
+        for {
+                rand.Read(bytes)
+                for i, b := range bytes {
+                        bytes[i] = chars[b%byte(len(chars))]
+                }
+		break
+        }
+
+        return string(bytes)
+}
+
+
+type Password struct{}
+
+func (p *Password) Generate(ctx context.Context, req *pb.GenerateRequest, rsp *pb.GenerateResponse) error {
+	if req.Length <= 0 {
+		req.Length = int32(minLength)
+	}
+
+	// TODO; allow user to specify types of characters
+
+	// generate and return password
+	rsp.Password = random(allChars, int(req.Length))
+
+	return nil
+}