feat: roles system backend

internal/domain/article/articleDomain.go

@@ -118,6 +118,7 @@ type Article struct {
 	Body              string          `json:"body"`
 	IsOnline          bool            `json:"is_online"`
 	SiteID            uint32          `json:"site_id"`
+	CreatedBy         uint32          `json:"-"`
 	Authors           []author.Byline `json:"authors"`
 	Slug              string          `json:"slug"`
 	Excerpt           string          `json:"excerpt"`

internal/domain/role/roleBuiltIn.go

@@ -0,0 +1,48 @@
+package role
+
+const (
+	OwnerName  = "Owner"
+	AdminName  = "Admin"
+	WriterName = "Writer"
+)
+
+func allGrants(include func(Permission) bool) []Grant {
+	grants := []Grant{}
+	for _, permission := range catalogue {
+		if include(permission) {
+			grants = append(grants, Grant{Key: permission.Key, Scope: ScopeAll})
+		}
+	}
+	return grants
+}
+
+func writerGrants() []Grant {
+	return []Grant{
+		{Key: "content.read", Scope: ScopeAll},
+		{Key: "content.create", Scope: ScopeAll},
+		{Key: "content.update", Scope: ScopeAll},
+		{Key: "schema.view", Scope: ScopeAll},
+		{Key: "media.view", Scope: ScopeAll},
+		{Key: "media.upload", Scope: ScopeAll},
+		{Key: "authors.view", Scope: ScopeAll},
+		{Key: "authors.edit", Scope: ScopeOwn},
+		{Key: "activity.view", Scope: ScopeOwn},
+	}
+}
+
+func BuiltInRoles() []Role {
+	return []Role{
+		{
+			Name: OwnerName, BuiltIn: true, Locked: true, Version: 1,
+			Grants: allGrants(func(Permission) bool { return true }),
+		},
+		{
+			Name: AdminName, BuiltIn: true, Version: 1,
+			Grants: allGrants(func(p Permission) bool { return !p.OwnerOnly }),
+		},
+		{
+			Name: WriterName, BuiltIn: true, Version: 1,
+			Grants: writerGrants(),
+		},
+	}
+}

internal/domain/role/roleCatalogue.go

@@ -0,0 +1,118 @@
+package role
+
+import "strings"
+
+type Kind string
+
+const (
+	KindScoped Kind = "scoped"
+	KindToggle Kind = "toggle"
+)
+
+const contentGroup = "content"
+
+type Permission struct {
+	Key       string
+	Group     string
+	Kind      Kind
+	OwnerOnly bool
+}
+
+func (p Permission) PerType() bool {
+	return strings.HasPrefix(p.Key, contentGroup+".")
+}
+
+func scoped(group, key string) Permission {
+	return Permission{Key: key, Group: group, Kind: KindScoped}
+}
+
+func toggle(group, key string) Permission {
+	return Permission{Key: key, Group: group, Kind: KindToggle}
+}
+
+func ownerOnly(group, key string) Permission {
+	return Permission{Key: key, Group: group, Kind: KindToggle, OwnerOnly: true}
+}
+
+var catalogue = []Permission{
+	scoped("content", "content.read"),
+	toggle("content", "content.create"),
+	scoped("content", "content.update"),
+	scoped("content", "content.delete"),
+	scoped("content", "content.publish"),
+	toggle("schema", "schema.view"),
+	toggle("schema", "schema.edit"),
+	toggle("schema", "schema.delete"),
+	toggle("media", "media.view"),
+	toggle("media", "media.upload"),
+	scoped("media", "media.delete"),
+	toggle("authors", "authors.view"),
+	toggle("authors", "authors.create"),
+	scoped("authors", "authors.edit"),
+	toggle("authors", "authors.delete"),
+	scoped("activity", "activity.view"),
+	toggle("activity", "activity.export"),
+	toggle("users", "users.view"),
+	toggle("users", "users.invite"),
+	toggle("users", "users.change_role"),
+	toggle("users", "users.remove"),
+	toggle("settings", "settings.view"),
+	toggle("settings", "settings.edit_general"),
+	toggle("settings", "settings.manage_sites"),
+	ownerOnly("settings", "settings.delete_site"),
+	scoped("settings", "apikeys.view"),
+	toggle("settings", "apikeys.create"),
+	scoped("settings", "apikeys.revoke"),
+	toggle("roles", "roles.view"),
+	toggle("roles", "roles.manage"),
+	ownerOnly("roles", "roles.edit_owner_only"),
+	ownerOnly("system", "system.apply_updates"),
+	ownerOnly("system", "system.edit_retention"),
+	ownerOnly("system", "system.transfer_ownership"),
+}
+
+func Catalogue() []Permission {
+	return append([]Permission(nil), catalogue...)
+}
+
+func Lookup(key string) (Permission, error) {
+	for _, permission := range catalogue {
+		if permission.Key == key {
+			return permission, nil
+		}
+	}
+	return Permission{}, ErrUnknownPermission
+}
+
+func Groups() []string {
+	groups := []string{}
+	for _, permission := range catalogue {
+		if len(groups) == 0 || groups[len(groups)-1] != permission.Group {
+			groups = append(groups, permission.Group)
+		}
+	}
+	return groups
+}
+
+const (
+	typeSeparator   = ":"
+	maxKeyLength    = 100
+	typeKeyAlphabet = "abcdefghijklmnopqrstuvwxyz0123456789_-"
+)
+
+func ParseTypedKey(composite string) (string, string, error) {
+	base, typeKey, found := strings.Cut(composite, typeSeparator)
+	if !found || len(composite) > maxKeyLength || typeKey == "" {
+		return "", "", ErrUnknownPermission
+	}
+	permission, err := Lookup(base)
+	if err != nil || !permission.PerType() {
+		return "", "", ErrUnknownPermission
+	}
+	for _, char := range typeKey {
+		if !strings.ContainsRune(typeKeyAlphabet, char) {
+			return "", "", ErrUnknownPermission
+		}
+	}
+	return base, typeKey, nil
+}

internal/domain/role/roleDomain.go

@@ -0,0 +1,120 @@
+package role
+
+import (
+	"errors"
+	"strings"
+)
+
+var (
+	ErrRoleNotFound      = errors.New("role not found")
+	ErrUnknownPermission = errors.New("unknown permission")
+	ErrRoleConflict      = errors.New("role was modified concurrently")
+	ErrInvalidScope      = errors.New("invalid scope for permission")
+	ErrOwnerOnlyGrant    = errors.New("owner-only permission granted to a non-owner role")
+)
+
+type Scope string
+
+const (
+	ScopeNone Scope = "none"
+	ScopeOwn  Scope = "own"
+	ScopeAll  Scope = "all"
+)
+
+type Grant struct {
+	Key   string `json:"key"`
+	Scope Scope  `json:"scope"`
+}
+
+type Role struct {
+	ID          uint32  `json:"id"`
+	Name        string  `json:"name"`
+	Description string  `json:"description"`
+	BuiltIn     bool    `json:"built_in"`
+	Locked      bool    `json:"locked"`
+	Version     uint32  `json:"version"`
+	Grants      []Grant `json:"grants"`
+}
+
+func (r Role) scopeOf(key string) Scope {
+	for _, grant := range r.Grants {
+		if grant.Key == key {
+			return grant.Scope
+		}
+	}
+	return ScopeNone
+}
+
+func (r Role) Allows(key string, owned bool) bool {
+	permission, err := Lookup(key)
+	if err != nil {
+		return false
+	}
+	if permission.OwnerOnly && !r.Locked {
+		return false
+	}
+	return scopeAllows(permission.Kind, r.scopeOf(key), owned)
+}
+
+func (r Role) AllowsFor(key string, typeKey string, owned bool) bool {
+	if typeKey == "" {
+		return r.Allows(key, owned)
+	}
+	composite := key + typeSeparator + typeKey
+	base, _, err := ParseTypedKey(composite)
+	if err != nil {
+		return false
+	}
+	permission, _ := Lookup(base)
+	for _, grant := range r.Grants {
+		if grant.Key == composite {
+			return scopeAllows(permission.Kind, grant.Scope, owned)
+		}
+	}
+	return r.Allows(key, owned)
+}
+
+func scopeAllows(kind Kind, scope Scope, owned bool) bool {
+	switch scope {
+	case ScopeAll:
+		return true
+	case ScopeOwn:
+		return kind == KindScoped && owned
+	default:
+		return false
+	}
+}
+
+func resolveGrantKey(key string) (Permission, error) {
+	if strings.Contains(key, typeSeparator) {
+		base, _, err := ParseTypedKey(key)
+		if err != nil {
+			return Permission{}, err
+		}
+		return Lookup(base)
+	}
+	return Lookup(key)
+}
+
+func ValidateGrants(locked bool, grants []Grant) error {
+	for _, grant := range grants {
+		permission, err := resolveGrantKey(grant.Key)
+		if err != nil {
+			return err
+		}
+		if permission.OwnerOnly && !locked {
+			return ErrOwnerOnlyGrant
+		}
+		if !scopeValidFor(permission.Kind, grant.Scope) {
+			return ErrInvalidScope
+		}
+	}
+	return nil
+}
+
+func scopeValidFor(kind Kind, scope Scope) bool {
+	if kind == KindToggle {
+		return scope == ScopeAll
+	}
+	return scope == ScopeOwn || scope == ScopeAll
+}

internal/domain/role/roleRepositoryInterface.go

@@ -0,0 +1,10 @@
+package role
+
+type Repository interface {
+	List() ([]Role, error)
+	Get(id uint32) (Role, error)
+	GetByName(name string) (Role, error)
+	ListGrants(roleID uint32) ([]Grant, error)
+	Create(created Role) (Role, error)
+	Save(saved Role) (Role, error)
+}

internal/domain/user/userDomain.go

@@ -47,6 +47,7 @@ type User struct {
 	DisplayName             string    `json:"display_name"`
 	IsVerified              bool      `json:"is_verified"`
 	Role                    Role      `json:"role"`
+	RoleID                  uint32    `json:"role_id"`
 	VerificationCode        string    `json:"verification_code"`
 	VerificationExpiration  time.Time `json:"verification_expiration"`
 	PasswordResetExpiration time.Time `json:"password_reset_expiration"`