Oxicloud/src/application/dtos/grant_dto.rs

//! DTOs for the ReBAC `/api/grants` REST endpoints.
//!
//! The wire shapes are intentionally separate from the domain types
//! (`Subject`, `Resource`, `Permission`, `Grant`) so that domain stays
//! storage-agnostic and DTOs can evolve with the HTTP contract.

use serde::{Deserialize, Serialize};
use utoipa::ToSchema;
use uuid::Uuid;

use crate::domain::services::authorization::{Grant, Permission, Resource, Subject};

// ════════════════════════════════════════════════════════════════════════════
// Subject / Resource / Permission DTOs
// ════════════════════════════════════════════════════════════════════════════

#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
#[serde(rename_all = "lowercase")]
pub enum SubjectTypeDto {
    User,
    Group,
    Token,
    External,
}

#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
pub struct SubjectDto {
    #[serde(rename = "type")]
    pub kind: SubjectTypeDto,
    pub id: Uuid,
}

impl From<SubjectDto> for Subject {
    fn from(dto: SubjectDto) -> Self {
        match dto.kind {
            SubjectTypeDto::User => Subject::User(dto.id),
            SubjectTypeDto::Group => Subject::Group(dto.id),
            SubjectTypeDto::Token => Subject::Token(dto.id),
            SubjectTypeDto::External => Subject::External(dto.id),
        }
    }
}

impl From<Subject> for SubjectDto {
    fn from(s: Subject) -> Self {
        let (kind, id) = match s {
            Subject::User(id) => (SubjectTypeDto::User, id),
            Subject::Group(id) => (SubjectTypeDto::Group, id),
            Subject::Token(id) => (SubjectTypeDto::Token, id),
            Subject::External(id) => (SubjectTypeDto::External, id),
        };
        SubjectDto { kind, id }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
#[serde(rename_all = "lowercase")]
pub enum ResourceTypeDto {
    Folder,
    File,
}

#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
pub struct ResourceDto {
    #[serde(rename = "type")]
    pub kind: ResourceTypeDto,
    pub id: Uuid,
}

impl From<ResourceDto> for Resource {
    fn from(dto: ResourceDto) -> Self {
        match dto.kind {
            ResourceTypeDto::Folder => Resource::Folder(dto.id),
            ResourceTypeDto::File => Resource::File(dto.id),
        }
    }
}

impl From<Resource> for ResourceDto {
    fn from(r: Resource) -> Self {
        let (kind, id) = match r {
            Resource::Folder(id) => (ResourceTypeDto::Folder, id),
            Resource::File(id) => (ResourceTypeDto::File, id),
        };
        ResourceDto { kind, id }
    }
}

#[derive(Debug, Clone, Copy, Serialize, Deserialize, ToSchema, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub enum PermissionDto {
    Read,
    Create,
    Share,
    Comment,
    Delete,
    Update,
}

impl From<PermissionDto> for Permission {
    fn from(p: PermissionDto) -> Self {
        match p {
            PermissionDto::Read => Permission::Read,
            PermissionDto::Create => Permission::Create,
            PermissionDto::Share => Permission::Share,
            PermissionDto::Comment => Permission::Comment,
            PermissionDto::Delete => Permission::Delete,
            PermissionDto::Update => Permission::Update,
        }
    }
}

impl From<Permission> for PermissionDto {
    fn from(p: Permission) -> Self {
        match p {
            Permission::Read => PermissionDto::Read,
            Permission::Create => PermissionDto::Create,
            Permission::Share => PermissionDto::Share,
            Permission::Comment => PermissionDto::Comment,
            Permission::Delete => PermissionDto::Delete,
            Permission::Update => PermissionDto::Update,
        }
    }
}

// ════════════════════════════════════════════════════════════════════════════
// Roles (DTO-layer sugar)
// ════════════════════════════════════════════════════════════════════════════

#[derive(Debug, Clone, Copy, Serialize, Deserialize, ToSchema)]
#[serde(rename_all = "lowercase")]
pub enum Role {
    Viewer,
    Commenter,
    Editor,
    Manager,
    Admin,
}

impl Role {
    /// Expands a role into its constituent raw permissions. Storage and
    /// engine know nothing about roles — the server normalizes here before
    /// writing rows.
    pub fn expand(self) -> &'static [Permission] {
        match self {
            Role::Viewer => &[Permission::Read],
            Role::Commenter => &[Permission::Read, Permission::Comment],
            Role::Editor => &[
                Permission::Read,
                Permission::Comment,
                Permission::Create,
                Permission::Update,
            ],
            Role::Manager => &[
                Permission::Read,
                Permission::Comment,
                Permission::Create,
                Permission::Update,
                Permission::Share,
            ],
            Role::Admin => &[
                Permission::Read,
                Permission::Comment,
                Permission::Create,
                Permission::Update,
                Permission::Share,
                Permission::Delete,
            ],
        }
    }
}

// ════════════════════════════════════════════════════════════════════════════
// Request DTOs
// ════════════════════════════════════════════════════════════════════════════

/// `POST /api/grants` — accepts either `permissions` (explicit) or `role`.
/// Server-side validation requires exactly one of the two to be present.
#[derive(Debug, Deserialize, ToSchema)]
pub struct CreateGrantDto {
    pub subject: SubjectDto,
    pub resource: ResourceDto,
    #[serde(default)]
    pub permissions: Option<Vec<PermissionDto>>,
    #[serde(default)]
    pub role: Option<Role>,
}

/// `PUT /api/grants/role` — reconcile a subject's role on a resource.
#[derive(Debug, Deserialize, ToSchema)]
pub struct UpdateRoleDto {
    pub subject: SubjectDto,
    pub resource: ResourceDto,
    pub role: Role,
}

// ════════════════════════════════════════════════════════════════════════════
// Response DTOs
// ════════════════════════════════════════════════════════════════════════════

#[derive(Debug, Clone, Serialize, ToSchema)]
pub struct GrantDto {
    pub id: Uuid,
    pub subject: SubjectDto,
    pub resource: ResourceDto,
    pub permission: PermissionDto,
    pub granted_by: Uuid,
    pub granted_at: chrono::DateTime<chrono::Utc>,
}

impl From<Grant> for GrantDto {
    fn from(g: Grant) -> Self {
        Self {
            id: g.id,
            subject: g.subject.into(),
            resource: g.resource.into(),
            permission: g.permission.into(),
            granted_by: g.granted_by,
            granted_at: g.granted_at,
        }
    }
}