bridge: allow to configure and pull without having set a user first

- init() only the importer or exporter as required
- assign a "default user" user Id to credentials at creation if no user has been set
- "bridge auth": also display the user
- "bridge auth show": adapt to a potential "default user" user Id
- "bridge configure": allow to run without a user set
- "bridge pull": allow to run without a user set
- "user adopt": replace "default user" by the actual user id when run

2 files changed, 33 insertions, 3 deletions

diff --git a/bridge/core/auth/credential.go b/bridge/core/auth/credential.go
index a462a116..fd026c5d 100644
--- a/bridge/core/auth/credential.go
+++ b/bridge/core/auth/credential.go
@@ -32,9 +32,15 @@ func NewErrMultipleMatchCredential(matching []entity.Id) *entity.ErrMultipleMatc
 	return entity.NewErrMultipleMatch("credential", matching)
 }
 
+// Special Id to mark a credential as being associated to the default user, whoever it might be.
+// The intended use is for the bridge configuration, to be able to create and store a credential
+// with no identities created yet, and then select one with `git-bug user adopt`
+const DefaultUserId = entity.Id("default-user")
+
 type Credential interface {
 	ID() entity.Id
 	UserId() entity.Id
+	updateUserId(id entity.Id)
 	Target() string
 	Kind() CredentialKind
 	CreateTime() time.Time
@@ -42,7 +48,7 @@ type Credential interface {
 
 	// Return all the specific properties of the credential that need to be saved into the configuration.
 	// This does not include Target, User, Kind and CreateTime.
-	ToConfig() map[string]string
+	toConfig() map[string]string
 }
 
 // Load loads a credential from the repo config
@@ -90,6 +96,7 @@ func LoadWithPrefix(repo repository.RepoConfig, prefix string) (Credential, erro
 	return matching[0], nil
 }
 
+// loadFromConfig is a helper to construct a Credential from the set of git configs
 func loadFromConfig(rawConfigs map[string]string, id entity.Id) (Credential, error) {
 	keyPrefix := fmt.Sprintf("%s.%s.", configKeyPrefix, id)
 
@@ -168,7 +175,7 @@ func PrefixExist(repo repository.RepoConfig, prefix string) bool {
 
 // Store stores a credential in the global git config
 func Store(repo repository.RepoConfig, cred Credential) error {
-	confs := cred.ToConfig()
+	confs := cred.toConfig()
 
 	prefix := fmt.Sprintf("%s.%s.", configKeyPrefix, cred.ID())
 
@@ -213,6 +220,25 @@ func Remove(repo repository.RepoConfig, id entity.Id) error {
 	return repo.GlobalConfig().RemoveAll(keyPrefix)
 }
 
+// ReplaceDefaultUser update all the credential attributed to the temporary "default user"
+// with a real user Id
+func ReplaceDefaultUser(repo repository.RepoConfig, id entity.Id) error {
+	list, err := List(repo, WithUserId(DefaultUserId))
+	if err != nil {
+		return err
+	}
+
+	for _, cred := range list {
+		cred.updateUserId(id)
+		err = Store(repo, cred)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 /*
  * Sorting
  */
diff --git a/bridge/core/auth/token.go b/bridge/core/auth/token.go
index 12a3bfc0..8333ef12 100644
--- a/bridge/core/auth/token.go
+++ b/bridge/core/auth/token.go
@@ -59,6 +59,10 @@ func (t *Token) UserId() entity.Id {
 	return t.userId
 }
 
+func (t *Token) updateUserId(id entity.Id) {
+	t.userId = id
+}
+
 func (t *Token) Target() string {
 	return t.target
 }
@@ -88,7 +92,7 @@ func (t *Token) Validate() error {
 	return nil
 }
 
-func (t *Token) ToConfig() map[string]string {
+func (t *Token) toConfig() map[string]string {
 	return map[string]string{
 		tokenValueKey: t.Value,
 	}