feat: add OAuth APIs with scoped permissions (#1542)

Co-authored-by: Alessandro (Ale) Segala <43508+ItalyPaleAle@users.noreply.github.com>

backend/internal/api/models.go

@@ -0,0 +1,38 @@
+package api
+
+import (
+	"github.com/pocket-id/pocket-id/backend/internal/model"
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+	"github.com/pocket-id/pocket-id/backend/internal/oidc"
+)
+
+type API struct {
+	model.Base
+
+	Name      string `sortable:"true"`
+	Audience  string `sortable:"true"`
+	UpdatedAt *datatype.DateTime
+
+	Permissions []Permission `gorm:"foreignKey:APIID;references:ID;constraint:OnDelete:CASCADE"`
+}
+
+type Permission struct {
+	model.Base
+
+	APIID       string `gorm:"column:api_id"`
+	Key         string `sortable:"true"`
+	Name        string
+	Description *string
+}
+
+func (Permission) TableName() string { return "api_permissions" }
+
+type OidcClientAllowedAPIPermission struct {
+	OidcClientID    string
+	APIPermissionID string
+	SubjectType     oidc.SubjectType
+}
+
+func (OidcClientAllowedAPIPermission) TableName() string {
+	return "oidc_clients_allowed_api_permissions"
+}