Rewrite the global id system to include tenant id

The API should be aware of the tenant they are working on. Many solution
is possible like passing a header, adding the tenant id in each function
call, encode the tenant id in the GID.

I consider the header as a hack it force the client to keep in mind to
pass this header, having to returns an error in case of not defined
header and add a non standard header make the API more harder to use.

Passing the tenant id everywhere will be a good option but since Relay
impose to have node(id: ID!) Node interface it is not possible or by
hacking by wrapping node(id: ID!) Node in top query who getting the
tenant_id.

I finish by simpliy encode the tenant id directly in the object id, it
what AWS do too, it allow to always have the information, and it ensure
a right data isolation.

Signed-off-by: gearnode <bryan@frimin.fr>

pkg/usrmgr/coredata/migrations/20150310T133000Z.sql

@@ -0,0 +1 @@
+ALTER TABLE usrmgr_users DROP COLUMN organization_id;

pkg/usrmgr/coredata/user.go

@@ -31,7 +31,6 @@ type (
 		EmailAddress   string    `db:"email_address"`
 		HashedPassword []byte    `db:"hashed_password"`
 		FullName       string    `db:"fullname"`
-		OrganizationID gid.GID   `db:"organization_id"`
 		CreatedAt      time.Time `db:"created_at"`
 		UpdatedAt      time.Time `db:"updated_at"`
 	}
@@ -52,7 +51,6 @@ SELECT
     email_address,
     hashed_password,
     fullname,
-    organization_id,
     created_at,
     updated_at
 FROM
@@ -90,7 +88,6 @@ SELECT
     email_address,
     hashed_password,
     fullname,
-    organization_id,
     created_at,
     updated_at
 FROM
@@ -123,13 +120,12 @@ func (u *User) Insert(
 ) error {
 	q := `
 INSERT INTO
-    usrmgr_users (id, email_address, hashed_password, fullname, organization_id, created_at, updated_at)
+    usrmgr_users (id, email_address, hashed_password, fullname, created_at, updated_at)
 VALUES (
     @user_id,
     @email_address,
     @hashed_password,
     @fullname,
-    @organization_id,
     @created_at,
     @updated_at
 )
@@ -140,7 +136,6 @@ VALUES (
 		"email_address":   u.EmailAddress,
 		"hashed_password": u.HashedPassword,
 		"fullname":        u.FullName,
-		"organization_id": "AZSfP_xAcAC5IAAAAAAltA",
 		"created_at":      u.CreatedAt,
 		"updated_at":      u.UpdatedAt,
 	}

pkg/usrmgr/usrmgr.go

@@ -109,7 +109,7 @@ func (s Service) RegisterUser(
 
 	now := time.Now()
 	user := &coredata.User{
-		ID:             gid.New(),
+		ID:             gid.New(gid.NilTenant, 0),
 		EmailAddress:   params.Email,
 		HashedPassword: hashedPassword,
 		FullName:       params.FullName,
@@ -151,8 +151,8 @@ func (s Service) Login(
 	now := time.Now()
 	user := &coredata.User{}
 	session := &coredata.Session{
-		ID:        gid.New(),
-		UserID:    gid.GID{}, // Will be set after user is loaded
+		ID:        gid.New(gid.NilTenant, 0),
+		UserID:    gid.Nil,
 		ExpiredAt: now.Add(24 * time.Hour),
 		CreatedAt: now,
 		UpdatedAt: now,
@@ -310,19 +310,6 @@ func (s Service) GetUserBySession(
 	return s.GetUserByID(ctx, session.UserID)
 }
 
-// GetUserOrganization gets the organization ID for a user
-func (s Service) GetUserOrganization(
-	ctx context.Context,
-	userID gid.GID,
-) (gid.GID, error) {
-	user, err := s.GetUserByID(ctx, userID)
-	if err != nil {
-		return gid.GID{}, err
-	}
-
-	return user.OrganizationID, nil
-}
-
 // GetUserOrganizations gets all organizations for a user
 func (s Service) GetUserOrganizations(
 	ctx context.Context,