🚧 Implement basic share handling

store.go

@@ -45,9 +45,22 @@ type UserStore interface {
 }
 
 type ShareStore interface {
+	CreateShare() (Share, error)
+	UpdateShareAttributes(share Share) error
+	RemoveShare(id uuid.UUID) error
+	AddUserToShare(share Share, username string, role ShareRole) error
+	RemoveUserFromShare(share Share, username string) error
+	AddLogin(share Share, username string, login Login) error
+	RemoveLogin(share Share, username string, loginName string) error
+
+	GetShares() ([]Share, error)
+
+	FindByLogin(username, loginName string) (LoginShare, error)
+	FindByUser(username string) ([]UserShare, error)
 }
 
-var _ UserStore = &DBStore{}
+var _ UserStore = (*DBStore)(nil)
+var _ ShareStore = (*DBStore)(nil)
 
 type GlobalRole string
 
@@ -72,30 +85,47 @@ type User struct {
 }
 
 type Share struct {
-	UUID      uuid.UUID
+	UUID        uuid.UUID
-	Directory string
+	Name        string
-	Users     []ShareUser
+	Description string
 }
 
 type ShareUser struct {
 	Username string
 	Role     ShareRole
-	Logins   []Login
 }
 
 type Login struct {
-	Loginname string
+	LoginName string
 	Password  string
 }
 
-const usersPrefix = "users:"
+// View on a share from the perspective of a user of that share.
+type UserShare struct {
+	Share
+	Role ShareRole
+}
+
+// View on a share from the perspective of a specific login (with associated user).
+type LoginShare struct {
+	Share
+	ShareUser
+	Login
+}
+
+const userPrefix = "user:"
+const sharePrefix = "share:"
 
 type DBStore struct {
 	db *buntdb.DB
 }
 
 func (u User) key() string {
-	return usersPrefix + u.Username
+	return userPrefix + u.Username
+}
+
+func (s Share) key() string {
+	return sharePrefix + s.UUID.String()
 }
 
 func NewDBStore(filename string) (*DBStore, error) {
@@ -135,6 +165,8 @@ func (u User) merge(updates User) (User, error) {
 	return merged, nil
 }
 
+var ErrShareNotFound = errors.New("share not found")
+
 func (store *DBStore) AddUser(user User) (err error) {
 	if strings.Contains(user.Username, ":") {
 		return ErrInvalidUsername
@@ -260,3 +292,117 @@ func hashPassword(password string) (string, error) {
 	}
 	return string(hash), nil
 }
+
+func (store *DBStore) CreateShare() (Share, error) {
+	share := Share{
+		UUID: uuid.NewV4(),
+	}
+
+	if err := store.db.Update(func(tx *buntdb.Tx) error {
+		b, err := json.Marshal(share)
+		if err != nil {
+			return fmt.Errorf("cannot marshal share: %w", err)
+		}
+		if _, _, err := tx.Set(share.key(), string(b), nil); err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return Share{}, err
+	}
+
+	return share, nil
+}
+
+func (store *DBStore) UpdateShareAttributes(share Share) error {
+	return store.db.Update(func(tx *buntdb.Tx) error {
+		var existingShare Share
+		if val, err := tx.Get(share.key()); err == buntdb.ErrNotFound {
+			return ErrShareNotFound
+		} else if err != nil {
+			return err
+		} else if err := json.Unmarshal([]byte(val), &existingShare); err != nil {
+			return fmt.Errorf("cannot unmarshal share %s: %w", share.UUID, err)
+		}
+
+		existingShare.UUID = share.UUID
+		existingShare.Name = share.Name
+		existingShare.Description = share.Description
+
+		if b, err := json.Marshal(existingShare); err != nil {
+			return fmt.Errorf("cannot marshal share %s: %w", share.UUID, err)
+		} else if _, _, err := tx.Set(existingShare.key(), string(b), nil); err != nil {
+			return err
+		}
+
+		return nil
+	})
+}
+
+func (store *DBStore) RemoveShare(id uuid.UUID) error {
+	return store.db.Update(func(tx *buntdb.Tx) error {
+		share := Share{UUID: id}
+		if _, err := tx.Delete(share.key()); err == buntdb.ErrNotFound {
+			return ErrShareNotFound
+		} else {
+			return err
+		}
+	})
+}
+
+func (store *DBStore) AddUserToShare(share Share, username string, role ShareRole) error {
+	panic("implement me")
+}
+
+func (store *DBStore) RemoveUserFromShare(share Share, username string) error {
+	panic("implement me")
+}
+
+func (store *DBStore) AddLogin(share Share, username string, login Login) error {
+	panic("implement me")
+}
+
+func (store *DBStore) RemoveLogin(share Share, username string, loginName string) error {
+	panic("implement me")
+}
+
+func (store *DBStore) GetShares() (shares []Share, err error) {
+	err = store.db.View(func(tx *buntdb.Tx) error {
+		var processingError error
+
+		if err := tx.AscendKeys(sharePrefix+"*", func(key, value string) bool {
+			var share Share
+
+			if err := json.Unmarshal([]byte(value), &share); err != nil {
+				processingError = err
+				return false
+			}
+
+			// Just in case ...
+			idString := strings.TrimPrefix(key, sharePrefix)
+			if id, err := uuid.FromString(idString); err != nil {
+				processingError = fmt.Errorf("invalid uuid in db: %q: %w", idString, err)
+				return false
+			} else {
+				share.UUID = id
+			}
+
+			shares = append(shares, share)
+			return true
+		}); err != nil {
+			return err
+		}
+
+		return processingError
+	})
+
+	return shares, err
+}
+
+func (store *DBStore) FindByLogin(username, loginName string) (LoginShare, error) {
+	panic("implement me")
+}
+
+func (store *DBStore) FindByUser(username string) ([]UserShare, error) {
+	panic("implement me")
+}

store_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"testing"
 
+	uuid "github.com/satori/go.uuid"
 	"github.com/tidwall/buntdb"
 )
 
@@ -101,3 +102,99 @@ func TestStoreUserHandling(t *testing.T) {
 		}
 	})
 }
+
+func TestStoreShareHandling(t *testing.T) {
+	store, err := NewDBStore(":memory:")
+	if err != nil {
+		t.Fatalf("cannot create store: %v", err)
+	}
+	defer store.Close()
+
+	t.Run("store should be empty initially", func(t *testing.T) {
+		shares, err := store.GetShares()
+		if err != nil {
+			t.Errorf("no error should have been returned: %v", err)
+		}
+		if len(shares) != 0 {
+			t.Errorf("there should be no shares")
+		}
+	})
+
+	t.Run("creating a share should work", func(t *testing.T) {
+		share, err := store.CreateShare()
+		if err != nil {
+			t.Errorf("error creating share: %v", err)
+			return
+		}
+		var emptyUUID uuid.UUID
+		if share.UUID == emptyUUID {
+			t.Errorf("UUID is empty")
+			return
+		}
+		if share.Name != "" || share.Description != "" {
+			t.Errorf("share should not have attributes set (yet)")
+		}
+
+		t.Run("share attributes can be set", func(t *testing.T) {
+			share.Name = "a name"
+			share.Description = "some desc"
+			if err := store.UpdateShareAttributes(share); err != nil {
+				t.Errorf("cannot set attributes of share: %v", err)
+			}
+		})
+
+		t.Run("cannot set attributes of unknown share", func(t *testing.T) {
+			otherShare := Share{UUID: uuid.NewV4()}
+			otherShare.Name = "foo"
+			otherShare.Description = "bar"
+
+			err := store.UpdateShareAttributes(otherShare)
+			if err == nil {
+				t.Errorf("an error should have been returned")
+			} else if err != ErrShareNotFound {
+				t.Errorf("wrong error has been returned: %v", err)
+			}
+		})
+
+		t.Run("share can be listed", func(t *testing.T) {
+			shares, err := store.GetShares()
+			if err != nil {
+				t.Errorf("error getting shares: %v", err)
+				return
+			}
+
+			if len(shares) != 1 {
+				t.Errorf("invalid number of shares: %d", len(shares))
+				return
+			}
+
+			if shares[0].UUID != share.UUID {
+				t.Errorf("unexpected uuid")
+			}
+			if shares[0].Name != "a name" {
+				t.Errorf("unexpected name")
+			}
+			if shares[0].Description != "some desc" {
+				t.Errorf("unexpected description")
+			}
+		})
+
+		t.Run("share can be removed", func(t *testing.T) {
+			if err := store.RemoveShare(share.UUID); err != nil {
+				t.Errorf("removing share failed: %v", err)
+			}
+		})
+	})
+
+	t.Run("database should be empty now", func(t *testing.T) {
+		// checks that we properly deleted all keys
+		if err := store.db.View(func(tx *buntdb.Tx) error {
+			return tx.Ascend("", func(key, value string) bool {
+				t.Errorf("there should be no keys left")
+				return false
+			})
+		}); err != nil {
+			t.Errorf("iterating keys failed: %v", err)
+		}
+	})
+}