chore: Make example/server usable for tests (#205)

* internal -> storage; split users into an interface

* move example/server/*.go to example/server/exampleop/

* export all User fields

* storage -> Storage

* example server now passes tests

example/server/storage/user.go

@@ -0,0 +1,71 @@
+package storage
+
+import (
+	"crypto/rsa"
+
+	"golang.org/x/text/language"
+)
+
+type User struct {
+	ID                string
+	Username          string
+	Password          string
+	FirstName         string
+	LastName          string
+	Email             string
+	EmailVerified     bool
+	Phone             string
+	PhoneVerified     bool
+	PreferredLanguage language.Tag
+}
+
+type Service struct {
+	keys map[string]*rsa.PublicKey
+}
+
+type UserStore interface {
+	GetUserByID(string) *User
+	GetUserByUsername(string) *User
+	ExampleClientID() string
+}
+
+type userStore struct {
+	users map[string]*User
+}
+
+func NewUserStore() UserStore {
+	return userStore{
+		users: map[string]*User{
+			"id1": {
+				ID:                "id1",
+				Username:          "test-user",
+				Password:          "verysecure",
+				FirstName:         "Test",
+				LastName:          "User",
+				Email:             "test-user@zitadel.ch",
+				EmailVerified:     true,
+				Phone:             "",
+				PhoneVerified:     false,
+				PreferredLanguage: language.German,
+			},
+		},
+	}
+}
+
+// ExampleClientID is only used in the example server
+func (u userStore) ExampleClientID() string {
+	return "service"
+}
+
+func (u userStore) GetUserByID(id string) *User {
+	return u.users[id]
+}
+
+func (u userStore) GetUserByUsername(username string) *User {
+	for _, user := range u.users {
+		if user.Username == username {
+			return user
+		}
+	}
+	return nil
+}