feat(folders): add curser and the normalized way to get foler's item list. add reverse order

src/application/dtos/folder_dto.rs

@@ -1,8 +1,13 @@
 use std::sync::Arc;
 
+use crate::application::dtos::cursor::{CursorListResponse, CursorQuery, PageCursor};
+use crate::application::dtos::grant_dto::{ResourceContentDto, ResourceTypeDto};
 use crate::domain::entities::folder::Folder;
+use crate::domain::services::authorization::ResourceKind;
+use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
-use utoipa::ToSchema;
+use utoipa::{IntoParams, ToSchema};
+use uuid::Uuid;
 
 /// DTO for folder creation requests
 #[derive(Debug, Deserialize, ToSchema)]
@@ -145,3 +150,138 @@ impl Default for FolderDto {
         Self::empty()
     }
 }
+
+// ════════════════════════════════════════════════════════════════════════════
+// Cursor-paginated folder resources  (GET /api/folders/{id}/resources)
+// ════════════════════════════════════════════════════════════════════════════
+
+/// Raw row returned by the UNION ALL query that combines `storage.folders` and
+/// `storage.files` for a given parent folder.  Used internally between the
+/// repository and service/handler layers — never serialised directly.
+pub struct FolderResourceRow {
+    pub resource_type: String, // "folder" | "file"
+    pub id: Uuid,
+    pub name: String,
+    /// Parent folder UUID (for both resource types).
+    pub parent_id: Option<Uuid>,
+    /// `None` for folders.
+    pub mime_type: Option<String>,
+    /// `-1` sentinel for folders (no physical size).
+    pub size: i64,
+    pub created_at: DateTime<Utc>,
+    pub modified_at: DateTime<Utc>,
+    pub owner_id: Uuid,
+    // Pre-computed sort fields — returned by the SQL for cursor construction.
+    /// `LOWER(name)` used by `name`/`type` sorts.
+    pub sort_str: String,
+    /// `category_order` for files, `0` for folders.
+    pub type_order: i64,
+    /// `0` for folders, `1` for files (used by `name` sort to keep folders first).
+    pub folder_first: i32,
+}
+
+/// Opaque keyset-pagination cursor for `/api/folders/{id}/resources`.
+///
+/// Encoded as base64url-JSON (same scheme as [`GrantCursor`]).
+/// Fields are sparse: only the sort-relevant ones are serialised.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FolderResourceCursor {
+    /// Sort dimension active when this cursor was produced.
+    #[serde(default = "FolderResourceCursor::default_order")]
+    pub order_by: String,
+    /// UUID of the last item on the previous page (tie-breaker).
+    pub resource_id: Uuid,
+    /// `LOWER(name)` for `name`/`type` sorts.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub sort_str: Option<String>,
+    /// Multipurpose integer sort key:
+    /// - `name`:  `folder_first` (0 = folder, 1 = file)
+    /// - `type`:  `category_order` (0 = Folder, 100 = Image …)
+    /// - `size`:  file size in bytes, -1 for folders
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub sort_int: Option<i64>,
+    /// Timestamp for `modified_at` / `created_at` sorts.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub sort_ts: Option<DateTime<Utc>>,
+    /// Whether the result set was reversed when this cursor was produced.
+    /// Must be passed unchanged on subsequent page requests.
+    #[serde(default)]
+    pub reverse: bool,
+}
+
+impl FolderResourceCursor {
+    fn default_order() -> String {
+        "name".to_owned()
+    }
+}
+
+impl PageCursor for FolderResourceCursor {}
+
+/// Query parameters for `GET /api/folders/{id}/resources`.
+#[derive(Debug, Deserialize, IntoParams)]
+pub struct FolderResourcesQuery {
+    /// Maximum items per page (1–200, default 50).
+    #[serde(default = "CursorQuery::default_limit")]
+    pub limit: u32,
+    /// Opaque cursor from a previous response. Omit to start from the top.
+    pub cursor: Option<String>,
+    /// Sort / group-by dimension. Supported: `"name"` (default), `"type"`,
+    /// `"modified_at"`, `"created_at"`, `"size"`.
+    pub order_by: Option<String>,
+    /// Comma-separated resource types to include, e.g. `"file,folder"`.
+    /// Omit to include both.
+    pub resource_types: Option<String>,
+    /// Reverse the sort order. Default `false` (normal order).
+    /// Must be the same on all pages of the same result set — the cursor
+    /// carries this flag so the server can validate consistency.
+    #[serde(default)]
+    pub reverse: bool,
+}
+
+impl FolderResourcesQuery {
+    /// Returns `limit` clamped to `[1, 200]`.
+    pub fn limit_clamped(&self) -> usize {
+        self.limit.clamp(1, 200) as usize
+    }
+
+    /// Decode the optional cursor string. Invalid cursor → start from top.
+    pub fn decode_cursor(&self) -> Option<FolderResourceCursor> {
+        self.cursor
+            .as_deref()
+            .and_then(FolderResourceCursor::decode)
+    }
+
+    /// Parse `resource_types` into a `Vec<ResourceKind>`.
+    /// Returns `None` when the field is absent (= include all types).
+    pub fn resource_kinds(&self) -> Option<Vec<ResourceKind>> {
+        self.resource_types.as_deref().map(|s| {
+            s.split(',')
+                .filter_map(|t| ResourceKind::parse(t.trim()))
+                .collect()
+        })
+    }
+}
+
+/// Options for [`FolderService::list_resources_paged_with_perms`].
+///
+/// Groups the optional parameters so the function stays within clippy's
+/// `too_many_arguments` limit while remaining easy to extend.
+pub struct ListResourcesOptions<'a> {
+    pub limit: usize,
+    pub cursor: Option<FolderResourceCursor>,
+    pub order_by: &'a str,
+    pub kinds: Option<&'a [ResourceKind]>,
+    pub reverse: bool,
+}
+
+/// One item in a `/resources` page — a file or folder with a `resource_type` tag.
+/// Re-uses [`ResourceContentDto`] so the shape is identical to `SharedWithMeItemDto.resource`.
+#[derive(Debug, Serialize, ToSchema)]
+pub struct FolderResourceItemDto {
+    pub resource_type: ResourceTypeDto,
+    /// Full resource details. Shape is determined by `resource_type`.
+    pub resource: ResourceContentDto,
+}
+
+/// Response envelope for `GET /api/folders/{id}/resources`.
+pub type FolderResourcesDto = CursorListResponse<FolderResourceItemDto>;

src/application/dtos/grant_dto.rs

@@ -252,6 +252,11 @@ pub struct SharedWithMeQuery {
     /// Comma-separated resource types to include, e.g. `file,folder`.
     /// Omit to return all known types.
     pub resource_types: Option<String>,
+    /// Reverse the sort order. Default `false` (normal order).
+    /// Must be the same on all pages of the same result set — the cursor
+    /// carries this flag so the server can validate consistency.
+    #[serde(default)]
+    pub reverse: bool,
 }
 
 impl SharedWithMeQuery {

src/application/ports/authorization_ports.rs

@@ -86,6 +86,7 @@ pub trait AuthorizationEngine: Send + Sync + 'static {
         limit: u32,
         cursor: Option<GrantCursor>,
         sort_by: &str,
+        reverse: bool,
     ) -> Result<(Vec<IncomingGrantSummary>, Option<GrantCursor>), DomainError>;
 
     /// All grants on a specific resource (for "Manage sharing" UI). Caller

src/application/services/folder_service.rs

@@ -1,5 +1,7 @@
+use crate::application::dtos::cursor::PageCursor;
 use crate::application::dtos::folder_dto::{
-    CreateFolderDto, FolderDto, MoveFolderDto, RenameFolderDto,
+    CreateFolderDto, FolderDto, FolderResourceCursor, FolderResourceRow, ListResourcesOptions,
+    MoveFolderDto, RenameFolderDto,
 };
 use crate::application::ports::authorization_ports::AuthorizationEngine;
 use crate::application::ports::folder_ports::FolderUseCase;
@@ -582,3 +584,109 @@ impl FolderUseCase for FolderService {
         })
     }
 }
+
+// ── FolderService — cursor-paginated resource listing ────────────────────────
+
+impl FolderService {
+    /// Cursor-paginated listing of sub-folders **and** files inside `parent_id`.
+    ///
+    /// Enforces `Permission::Read` on the parent folder before querying.
+    /// `order_by` controls both the SQL `ORDER BY` and the cursor encoding.
+    /// `kinds` filters the result to only the specified resource types.
+    pub async fn list_resources_paged_with_perms(
+        &self,
+        parent_id: &str,
+        caller_id: Uuid,
+        opts: ListResourcesOptions<'_>,
+    ) -> Result<(Vec<FolderResourceRow>, Option<String>), DomainError> {
+        // 1. AuthZ — same check as list_folders_with_perms
+        self.authz
+            .require(
+                Subject::User(caller_id),
+                Permission::Read,
+                Self::folder_resource(parent_id)?,
+            )
+            .await?;
+
+        let pid =
+            Uuid::parse_str(parent_id).map_err(|_| DomainError::not_found("Folder", parent_id))?;
+
+        let ListResourcesOptions {
+            limit,
+            cursor,
+            order_by,
+            kinds,
+            reverse,
+        } = opts;
+
+        // 2. Fetch limit+1 rows so we can detect has_next
+        let mut rows = self
+            .folder_storage
+            .list_resources_paged(pid, limit + 1, cursor.as_ref(), order_by, kinds, reverse)
+            .await?;
+
+        // 3. Detect has_next, build encoded next cursor
+        let next_cursor = if rows.len() > limit {
+            let last = &rows[limit - 1];
+            let c = build_folder_resource_cursor(last, order_by, reverse);
+            rows.truncate(limit);
+            Some(c.encode())
+        } else {
+            None
+        };
+
+        Ok((rows, next_cursor))
+    }
+}
+
+/// Build the next-page cursor from the last row of the current page.
+/// `reverse` is stored in the cursor so subsequent pages use the same order.
+fn build_folder_resource_cursor(
+    row: &FolderResourceRow,
+    order_by: &str,
+    reverse: bool,
+) -> FolderResourceCursor {
+    match order_by {
+        "type" => FolderResourceCursor {
+            order_by: "type".to_owned(),
+            resource_id: row.id,
+            sort_str: Some(row.sort_str.clone()),
+            sort_int: Some(row.type_order),
+            sort_ts: None,
+            reverse,
+        },
+        "modified_at" => FolderResourceCursor {
+            order_by: "modified_at".to_owned(),
+            resource_id: row.id,
+            sort_str: None,
+            sort_int: None,
+            sort_ts: Some(row.modified_at),
+            reverse,
+        },
+        "created_at" => FolderResourceCursor {
+            order_by: "created_at".to_owned(),
+            resource_id: row.id,
+            sort_str: None,
+            sort_int: None,
+            sort_ts: Some(row.created_at),
+            reverse,
+        },
+        "size" => FolderResourceCursor {
+            order_by: "size".to_owned(),
+            resource_id: row.id,
+            sort_str: None,
+            sort_int: Some(row.size),
+            sort_ts: None,
+            reverse,
+        },
+        _ => FolderResourceCursor {
+            // "name" (default): sort_int = folder_first (0 or 1)
+            order_by: "name".to_owned(),
+            resource_id: row.id,
+            sort_str: Some(row.sort_str.clone()),
+            sort_int: Some(i64::from(row.folder_first)),
+            sort_ts: None,
+            reverse,
+        },
+    }
+}

src/domain/services/authorization.rs

@@ -285,6 +285,10 @@ pub struct GrantCursor {
     /// - `"size"`  — file size in bytes (-1 = Folder sentinel)
     #[serde(skip_serializing_if = "Option::is_none")]
     pub sort_int: Option<i64>,
+    /// Whether the result set was reversed when this cursor was produced.
+    /// Must be passed unchanged on subsequent page requests.
+    #[serde(default)]
+    pub reverse: bool,
 }
 
 impl GrantCursor {

src/infrastructure/repositories/pg/folder_db_repository.rs

@@ -12,9 +12,11 @@ use sqlx::PgPool;
 use std::sync::Arc;
 use uuid::Uuid;
 
+use crate::application::dtos::folder_dto::{FolderResourceCursor, FolderResourceRow};
 use crate::common::errors::DomainError;
 use crate::domain::entities::folder::Folder;
 use crate::domain::repositories::folder_repository::FolderRepository;
+use crate::domain::services::authorization::ResourceKind;
 use crate::domain::services::path_service::StoragePath;
 
 /// Type alias for folder metadata rows from SQL queries.
@@ -1060,4 +1062,238 @@ impl FolderDbRepository {
         }
         Ok(())
     }
+
+    /// Cursor-paginated combined listing of sub-folders and files inside
+    /// `parent_id`, sorted by `order_by`.
+    ///
+    /// **Authorization must be verified by the caller** before invoking this
+    /// method — no ownership filter is applied here.
+    ///
+    /// Fetches `limit` rows (caller should pass `desired_page_size + 1` to
+    /// detect the existence of a next page).  Returns raw [`FolderResourceRow`]
+    /// values; the handler / service layer converts them to DTOs.
+    pub async fn list_resources_paged(
+        &self,
+        parent_id: Uuid,
+        limit: usize,
+        cursor: Option<&FolderResourceCursor>,
+        order_by: &str,
+        kinds: Option<&[ResourceKind]>,
+        reverse: bool,
+    ) -> Result<Vec<FolderResourceRow>, DomainError> {
+        let include_folders = kinds.is_none_or(|k| k.contains(&ResourceKind::Folder));
+        let include_files = kinds.is_none_or(|k| k.contains(&ResourceKind::File));
+
+        if !include_folders && !include_files {
+            return Ok(Vec::new());
+        }
+
+        // ── CTE branches ────────────────────────────────────────────────────
+        let folder_branch = r#"
+            SELECT
+                'folder'::text            AS resource_type,
+                f.id,
+                f.name,
+                f.parent_id               AS folder_id,
+                NULL::text                AS mime_type,
+                -1::bigint                AS size,
+                f.created_at,
+                f.updated_at              AS modified_at,
+                f.user_id,
+                LOWER(f.name)             AS sort_str,
+                0::bigint                 AS type_order,
+                0::int                    AS folder_first
+            FROM storage.folders f
+            WHERE f.parent_id = $1::uuid AND NOT f.is_trashed
+        "#;
+
+        let file_branch = r#"
+            SELECT
+                'file'::text              AS resource_type,
+                fm.id,
+                fm.name,
+                fm.folder_id,
+                fm.mime_type,
+                fm.size::bigint,
+                fm.created_at,
+                fm.updated_at             AS modified_at,
+                fm.user_id,
+                LOWER(fm.name)            AS sort_str,
+                fm.category_order::bigint AS type_order,
+                1::int                    AS folder_first
+            FROM storage.files fm
+            WHERE fm.folder_id = $1::uuid AND NOT fm.is_trashed
+        "#;
+
+        let cte_inner = match (include_folders, include_files) {
+            (true, true) => format!("{folder_branch} UNION ALL {file_branch}"),
+            (true, false) => folder_branch.to_owned(),
+            (false, true) => file_branch.to_owned(),
+            (false, false) => unreachable!(),
+        };
+
+        // ── Cursor binds ─────────────────────────────────────────────────────
+        // $1 = parent_id   $2 = cursor_str   $3 = cursor_int
+        // $4 = cursor_ts   $5 = cursor_id    $6 = limit
+        let cursor_str = cursor.and_then(|c| c.sort_str.clone());
+        let cursor_int = cursor.and_then(|c| c.sort_int);
+        let cursor_ts = cursor.and_then(|c| c.sort_ts);
+        let cursor_id = cursor.map(|c| c.resource_id);
+
+        // ── Sort-specific WHERE + ORDER BY ───────────────────────────────────
+        // Each arm produces two variants based on `reverse`.
+        // For "name": folder_first stays ASC in both directions (folders always
+        // precede files); only the alpha order within each group flips.
+        let (where_clause, order_clause) = match order_by {
+            "type" => {
+                if reverse {
+                    (
+                        r#"WHERE ($3::bigint IS NULL)
+                              OR (type_order < $3)
+                              OR (type_order = $3 AND sort_str < $2)
+                              OR (type_order = $3 AND sort_str = $2 AND id < $5::uuid)"#,
+                        "ORDER BY type_order DESC, sort_str DESC, id DESC",
+                    )
+                } else {
+                    (
+                        r#"WHERE ($3::bigint IS NULL)
+                              OR (type_order > $3)
+                              OR (type_order = $3 AND sort_str > $2)
+                              OR (type_order = $3 AND sort_str = $2 AND id > $5::uuid)"#,
+                        "ORDER BY type_order ASC, sort_str ASC, id ASC",
+                    )
+                }
+            }
+            "modified_at" => {
+                if reverse {
+                    (
+                        r#"WHERE ($4::timestamptz IS NULL)
+                              OR (modified_at > $4)
+                              OR (modified_at = $4 AND id > $5::uuid)"#,
+                        "ORDER BY modified_at ASC, id ASC",
+                    )
+                } else {
+                    (
+                        r#"WHERE ($4::timestamptz IS NULL)
+                              OR (modified_at < $4)
+                              OR (modified_at = $4 AND id < $5::uuid)"#,
+                        "ORDER BY modified_at DESC, id DESC",
+                    )
+                }
+            }
+            "created_at" => {
+                if reverse {
+                    (
+                        r#"WHERE ($4::timestamptz IS NULL)
+                              OR (created_at > $4)
+                              OR (created_at = $4 AND id > $5::uuid)"#,
+                        "ORDER BY created_at ASC, id ASC",
+                    )
+                } else {
+                    (
+                        r#"WHERE ($4::timestamptz IS NULL)
+                              OR (created_at < $4)
+                              OR (created_at = $4 AND id < $5::uuid)"#,
+                        "ORDER BY created_at DESC, id DESC",
+                    )
+                }
+            }
+            "size" => {
+                if reverse {
+                    (
+                        r#"WHERE ($3::bigint IS NULL)
+                              OR (size < $3)
+                              OR (size = $3 AND id < $5::uuid)"#,
+                        "ORDER BY size DESC, id DESC",
+                    )
+                } else {
+                    (
+                        r#"WHERE ($3::bigint IS NULL)
+                              OR (size > $3)
+                              OR (size = $3 AND id > $5::uuid)"#,
+                        "ORDER BY size ASC, id ASC",
+                    )
+                }
+            }
+            _ => {
+                // "name" (default): folder_first stays ASC so folders always precede
+                // files; only the alpha order within each group flips when reversed.
+                if reverse {
+                    (
+                        r#"WHERE ($3::bigint IS NULL)
+                              OR (folder_first::bigint > $3)
+                              OR (folder_first::bigint = $3 AND sort_str < $2)
+                              OR (folder_first::bigint = $3 AND sort_str = $2 AND id < $5::uuid)"#,
+                        "ORDER BY folder_first ASC, sort_str DESC, id DESC",
+                    )
+                } else {
+                    (
+                        r#"WHERE ($3::bigint IS NULL)
+                              OR (folder_first::bigint > $3)
+                              OR (folder_first::bigint = $3 AND sort_str > $2)
+                              OR (folder_first::bigint = $3 AND sort_str = $2 AND id > $5::uuid)"#,
+                        "ORDER BY folder_first ASC, sort_str ASC, id ASC",
+                    )
+                }
+            }
+        };
+
+        let sql = format!(
+            "WITH resources AS ({cte_inner}) \
+             SELECT resource_type, id, name, folder_id, mime_type, size, \
+                    created_at, modified_at, user_id, sort_str, type_order, folder_first \
+             FROM resources \
+             {where_clause} \
+             {order_clause} \
+             LIMIT $6"
+        );
+
+        // Row: (resource_type, id, name, folder_id, mime_type, size,
+        //        created_at, modified_at, user_id, sort_str, type_order, folder_first)
+        type Row = (
+            String,
+            Uuid,
+            String,
+            Option<Uuid>,
+            Option<String>,
+            i64,
+            chrono::DateTime<chrono::Utc>,
+            chrono::DateTime<chrono::Utc>,
+            Uuid,
+            String,
+            i64,
+            i32,
+        );
+
+        let rows = sqlx::query_as::<_, Row>(&sql)
+            .bind(parent_id)
+            .bind(cursor_str)
+            .bind(cursor_int)
+            .bind(cursor_ts)
+            .bind(cursor_id)
+            .bind(limit as i64)
+            .fetch_all(self.pool())
+            .await
+            .map_err(|e| {
+                DomainError::internal_error("FolderDb", format!("list_resources_paged: {e}"))
+            })?;
+
+        Ok(rows
+            .into_iter()
+            .map(|r| FolderResourceRow {
+                resource_type: r.0,
+                id: r.1,
+                name: r.2,
+                parent_id: r.3,
+                mime_type: r.4,
+                size: r.5,
+                created_at: r.6,
+                modified_at: r.7,
+                owner_id: r.8,
+                sort_str: r.9,
+                type_order: r.10,
+                folder_first: r.11,
+            })
+            .collect())
+    }
 }

src/infrastructure/services/pg_acl_engine.rs

@@ -300,6 +300,7 @@ impl AuthorizationEngine for PgAclEngine {
         limit: u32,
         cursor: Option<GrantCursor>,
         sort_by: &str,
+        reverse: bool,
     ) -> Result<(Vec<IncomingGrantSummary>, Option<GrantCursor>), DomainError> {
         // ── Common setup ──────────────────────────────────────────────────────
         let kind_strs: Option<Vec<&str>> = if kinds.is_empty() {
@@ -358,6 +359,7 @@ impl AuthorizationEngine for PgAclEngine {
         // ── Build sort-specific SQL fragments ─────────────────────────────────
         // "name" and "type" share the same LEFT JOINs; only sort_int_expr,
         // the cursor WHERE condition, and ORDER BY differ.
+        // Each branch emits two variants selected by `reverse`.
         let sql = match sort_by {
             "name" | "type" => {
                 let sort_int_expr = if sort_by == "type" {
@@ -365,20 +367,39 @@ impl AuthorizationEngine for PgAclEngine {
                 } else {
                     "NULL::bigint"
                 };
-                let where_clause = if sort_by == "type" {
-                    r#"(  $5::integer IS NULL
-                       OR sort_int > $5
-                       OR (sort_int = $5 AND LOWER(sort_str) > $4)
-                       OR (sort_int = $5 AND LOWER(sort_str) = $4 AND resource_id > $7::uuid))"#
+                // Normal vs reversed keyset + ORDER BY.
+                let (where_clause, order_clause) = if sort_by == "type" {
+                    if reverse {
+                        (
+                            r#"(  $5::integer IS NULL
+                               OR sort_int < $5
+                               OR (sort_int = $5 AND LOWER(sort_str) < $4)
+                               OR (sort_int = $5 AND LOWER(sort_str) = $4 AND resource_id < $7::uuid))"#,
+                            "sort_int DESC, LOWER(sort_str) DESC, resource_id DESC",
+                        )
+                    } else {
+                        (
+                            r#"(  $5::integer IS NULL
+                               OR sort_int > $5
+                               OR (sort_int = $5 AND LOWER(sort_str) > $4)
+                               OR (sort_int = $5 AND LOWER(sort_str) = $4 AND resource_id > $7::uuid))"#,
+                            "sort_int ASC, LOWER(sort_str) ASC, resource_id ASC",
+                        )
+                    }
+                } else if reverse {
+                    (
+                        r#"(  $4::text IS NULL
+                           OR LOWER(sort_str) < $4
+                           OR (LOWER(sort_str) = $4 AND resource_id < $7::uuid))"#,
+                        "LOWER(sort_str) DESC, resource_id DESC",
+                    )
                 } else {
-                    r#"(  $4::text IS NULL
-                       OR LOWER(sort_str) > $4
-                       OR (LOWER(sort_str) = $4 AND resource_id > $7::uuid))"#
-                };
-                let order_clause = if sort_by == "type" {
-                    "sort_int ASC, LOWER(sort_str) ASC, resource_id ASC"
-                } else {
-                    "LOWER(sort_str) ASC, resource_id ASC"
+                    (
+                        r#"(  $4::text IS NULL
+                           OR LOWER(sort_str) > $4
+                           OR (LOWER(sort_str) = $4 AND resource_id > $7::uuid))"#,
+                        "LOWER(sort_str) ASC, resource_id ASC",
+                    )
                 };
                 format!(
                     r#"WITH {AGG},
@@ -400,64 +421,112 @@ impl AuthorizationEngine for PgAclEngine {
                     LIMIT $8"#
                 )
             }
-            "granted_by" => format!(
+            "granted_by" => {
                 // Joins auth.users to sort alphabetically by username.
                 // Cursor encodes (owner_name=$4, granted_at=$6, resource_id=$7).
-                r#"WITH {AGG},
-                owner_named AS (
-                    SELECT agg.*,
-                        LOWER(u.username) AS sort_str,
-                        NULL::bigint AS sort_int
-                    FROM agg
-                    LEFT JOIN auth.users u ON u.id = agg.granted_by
+                let (where_clause, order_clause) = if reverse {
+                    (
+                        r#"(  $4::text IS NULL
+                          OR sort_str < $4
+                          OR (sort_str = $4 AND (
+                                  $6::timestamptz IS NULL
+                               OR granted_at > $6
+                               OR (granted_at = $6 AND resource_id > $7::uuid))))"#,
+                        "sort_str DESC, granted_at ASC, resource_id ASC",
+                    )
+                } else {
+                    (
+                        r#"(  $4::text IS NULL
+                          OR sort_str > $4
+                          OR (sort_str = $4 AND (
+                                  $6::timestamptz IS NULL
+                               OR granted_at < $6
+                               OR (granted_at = $6 AND resource_id < $7::uuid))))"#,
+                        "sort_str ASC, granted_at DESC, resource_id DESC",
+                    )
+                };
+                format!(
+                    r#"WITH {AGG},
+                    owner_named AS (
+                        SELECT agg.*,
+                            LOWER(u.username) AS sort_str,
+                            NULL::bigint AS sort_int
+                        FROM agg
+                        LEFT JOIN auth.users u ON u.id = agg.granted_by
+                    )
+                    SELECT resource_type, resource_id, permissions, granted_at, granted_by, sort_str, sort_int
+                    FROM owner_named
+                    WHERE {where_clause}
+                    ORDER BY {order_clause}
+                    LIMIT $8"#
                 )
-                SELECT resource_type, resource_id, permissions, granted_at, granted_by, sort_str, sort_int
-                FROM owner_named
-                WHERE (  $4::text IS NULL
-                      OR sort_str > $4
-                      OR (sort_str = $4 AND (
-                              $6::timestamptz IS NULL
-                           OR granted_at < $6
-                           OR (granted_at = $6 AND resource_id < $7::uuid))))
-                ORDER BY sort_str ASC, granted_at DESC, resource_id DESC
-                LIMIT $8"#
-            ),
-            "size" => format!(
-                // Folders have no size — they sort first with a sentinel of -1.
-                // Files sort by size ASC; resource_id breaks ties.
+            }
+            "size" => {
+                // Folders have no size — sentinel -1 (sorts first ASC, last DESC).
                 // Cursor encodes (sort_int=$5, resource_id=$7); $4/$6 unused.
-                r#"WITH {AGG},
-                sized AS (
-                    SELECT agg.*,
-                        NULL::text AS sort_str,
-                        CASE WHEN agg.resource_type = 'folder' THEN -1
-                             ELSE fi.size
-                        END AS sort_int
-                    FROM agg
-                    LEFT JOIN storage.files fi ON fi.id = agg.resource_id AND agg.resource_type = 'file'
+                let (where_clause, order_clause) = if reverse {
+                    (
+                        r#"(  $5::bigint IS NULL
+                          OR sort_int < $5
+                          OR (sort_int = $5 AND resource_id < $7::uuid))"#,
+                        "sort_int DESC, resource_id DESC",
+                    )
+                } else {
+                    (
+                        r#"(  $5::bigint IS NULL
+                          OR sort_int > $5
+                          OR (sort_int = $5 AND resource_id > $7::uuid))"#,
+                        "sort_int ASC, resource_id ASC",
+                    )
+                };
+                format!(
+                    r#"WITH {AGG},
+                    sized AS (
+                        SELECT agg.*,
+                            NULL::text AS sort_str,
+                            CASE WHEN agg.resource_type = 'folder' THEN -1
+                                 ELSE fi.size
+                            END AS sort_int
+                        FROM agg
+                        LEFT JOIN storage.files fi ON fi.id = agg.resource_id AND agg.resource_type = 'file'
+                    )
+                    SELECT resource_type, resource_id, permissions, granted_at, granted_by, sort_str, sort_int
+                    FROM sized
+                    WHERE {where_clause}
+                    ORDER BY {order_clause}
+                    LIMIT $8"#
                 )
-                SELECT resource_type, resource_id, permissions, granted_at, granted_by, sort_str, sort_int
-                FROM sized
-                WHERE (  $5::bigint IS NULL
-                      OR sort_int > $5
-                      OR (sort_int = $5 AND resource_id > $7::uuid))
-                ORDER BY sort_int ASC, resource_id ASC
-                LIMIT $8"#
-            ),
-            _ => format!(
-                // Default: sort by grant date DESC (newest first).
+            }
+            _ => {
+                // Default: sort by grant date.
+                // Normal = DESC (newest first); reversed = ASC (oldest first).
                 // Cursor encodes (granted_at=$6, resource_id=$7); $4/$5 unused.
-                r#"WITH {AGG}
-                SELECT resource_type, resource_id, permissions, granted_at, granted_by,
-                       NULL::text   AS sort_str,
-                       NULL::bigint AS sort_int
-                FROM agg
-                WHERE (  $6::timestamptz IS NULL
-                      OR granted_at < $6
-                      OR (granted_at = $6 AND resource_id < $7::uuid))
-                ORDER BY granted_at DESC, resource_id DESC
-                LIMIT $8"#
-            ),
+                let (where_clause, order_clause) = if reverse {
+                    (
+                        r#"(  $6::timestamptz IS NULL
+                          OR granted_at > $6
+                          OR (granted_at = $6 AND resource_id > $7::uuid))"#,
+                        "granted_at ASC, resource_id ASC",
+                    )
+                } else {
+                    (
+                        r#"(  $6::timestamptz IS NULL
+                          OR granted_at < $6
+                          OR (granted_at = $6 AND resource_id < $7::uuid))"#,
+                        "granted_at DESC, resource_id DESC",
+                    )
+                };
+                format!(
+                    r#"WITH {AGG}
+                    SELECT resource_type, resource_id, permissions, granted_at, granted_by,
+                           NULL::text   AS sort_str,
+                           NULL::bigint AS sort_int
+                    FROM agg
+                    WHERE {where_clause}
+                    ORDER BY {order_clause}
+                    LIMIT $8"#
+                )
+            }
         };
 
         // ── Execute — uniform 8 binds for every sort mode ─────────────────────
@@ -493,6 +562,7 @@ impl AuthorizationEngine for PgAclEngine {
                         resource_id: r.1,
                         resource_name: sort_str_lc,
                         sort_int: None,
+                        reverse,
                     },
                     "type" => GrantCursor {
                         sort_by: "type".to_owned(),
@@ -500,6 +570,7 @@ impl AuthorizationEngine for PgAclEngine {
                         resource_id: r.1,
                         resource_name: sort_str_lc,
                         sort_int: r.6,
+                        reverse,
                     },
                     "granted_by" => GrantCursor {
                         sort_by: "granted_by".to_owned(),
@@ -507,6 +578,7 @@ impl AuthorizationEngine for PgAclEngine {
                         resource_id: r.1,
                         resource_name: r.5.clone(), // already lowercased by SQL
                         sort_int: None,
+                        reverse,
                     },
                     "size" => GrantCursor {
                         sort_by: "size".to_owned(),
@@ -514,6 +586,7 @@ impl AuthorizationEngine for PgAclEngine {
                         resource_id: r.1,
                         resource_name: None,
                         sort_int: r.6,
+                        reverse,
                     },
                     _ => GrantCursor {
                         sort_by: "granted_at".to_owned(),
@@ -521,6 +594,7 @@ impl AuthorizationEngine for PgAclEngine {
                         resource_id: r.1,
                         resource_name: None,
                         sort_int: None,
+                        reverse,
                     },
                 }
             })

src/interfaces/api/handlers/folder_handler.rs

@@ -10,10 +10,16 @@ use std::hash::{Hash, Hasher};
 use std::sync::Arc;
 use tokio_util::io::ReaderStream;
 
+use crate::application::dtos::display_helpers::{
+    category_for, format_file_size, icon_class_for, icon_special_class_for,
+};
+use crate::application::dtos::file_dto::FileDto;
 use crate::application::dtos::folder_dto::{
-    CreateFolderDto, FolderDto, MoveFolderDto, RenameFolderDto,
+    CreateFolderDto, FolderDto, FolderResourceItemDto, FolderResourcesDto, FolderResourcesQuery,
+    ListResourcesOptions, MoveFolderDto, RenameFolderDto,
 };
 use crate::application::dtos::folder_listing_dto::FolderListingDto;
+use crate::application::dtos::grant_dto::{ResourceContentDto, ResourceTypeDto};
 use crate::application::dtos::pagination::PaginationRequestDto;
 use crate::application::ports::file_ports::FileRetrievalUseCase;
 use crate::application::ports::folder_ports::FolderUseCase;
@@ -466,6 +472,7 @@ pub async fn list_root_folders(
     FolderHandler::list_root_folders_impl(state, auth_user).await
 }
 
+#[deprecated = "Use /api/folders/{id}/resources instead"]
 #[utoipa::path(
     get,
     path = "/api/folders/{id}/contents",
@@ -477,6 +484,7 @@ pub async fn list_root_folders(
     security(("bearerAuth" = [])),
     tag = "folders"
 )]
+#[allow(deprecated)]
 pub async fn list_folder_contents(
     state: State<AppState>,
     auth_user: AuthUser,
@@ -503,6 +511,7 @@ pub async fn list_root_folders_paginated(
     FolderHandler::list_root_folders_paginated_impl(state, auth_user, pagination).await
 }
 
+#[deprecated = "Use /api/folders/{id}/resources instead"]
 #[utoipa::path(
     get,
     path = "/api/folders/{id}/contents/paginated",
@@ -517,6 +526,7 @@ pub async fn list_root_folders_paginated(
     security(("bearerAuth" = [])),
     tag = "folders"
 )]
+#[allow(deprecated)]
 pub async fn list_folder_contents_paginated(
     state: State<AppState>,
     auth_user: AuthUser,
@@ -526,6 +536,7 @@ pub async fn list_folder_contents_paginated(
     FolderHandler::list_folder_contents_paginated_impl(state, auth_user, path, pagination).await
 }
 
+#[deprecated = "Use /api/folders/{id}/resources instead"]
 #[utoipa::path(
     get,
     path = "/api/folders/{id}/listing",
@@ -538,6 +549,7 @@ pub async fn list_folder_contents_paginated(
     security(("bearerAuth" = [])),
     tag = "folders"
 )]
+#[allow(deprecated)]
 pub async fn list_folder_listing(
     state: State<Arc<GlobalAppState>>,
     auth_user: AuthUser,
@@ -628,3 +640,105 @@ pub async fn download_folder_zip(
 ) -> impl IntoResponse {
     FolderHandler::download_folder_zip_impl(state, auth_user, path, query).await
 }
+
+// ── GET /api/folders/{id}/resources ─────────────────────────────────────────
+
+#[utoipa::path(
+    get,
+    path = "/api/folders/{id}/resources",
+    params(
+        ("id" = String, Path, description = "Folder ID"),
+        FolderResourcesQuery,
+    ),
+    responses(
+        (status = 200,
+         description = "Cursor-paginated files and folders inside the requested folder. \
+                        Items arrive in `order_by` order (folders first when order_by=name). \
+                        `next_cursor` is absent on the last page.",
+         body = FolderResourcesDto),
+        (status = 404, description = "Folder not found or access denied"),
+    ),
+    tag = "folders"
+)]
+pub async fn list_folder_resources(
+    State(service): State<AppState>,
+    auth_user: AuthUser,
+    Path(id): Path<String>,
+    Query(q): Query<FolderResourcesQuery>,
+) -> impl IntoResponse {
+    let order_by = q.order_by.clone().unwrap_or_else(|| "name".to_owned());
+    let kinds = q.resource_kinds();
+    let opts = ListResourcesOptions {
+        limit: q.limit_clamped(),
+        cursor: q.decode_cursor(),
+        order_by: &order_by,
+        kinds: kinds.as_deref(),
+        reverse: q.reverse,
+    };
+
+    match service
+        .list_resources_paged_with_perms(&id, auth_user.id, opts)
+        .await
+    {
+        Ok((rows, next_cursor)) => {
+            let items: Vec<FolderResourceItemDto> = rows
+                .into_iter()
+                .map(|row| {
+                    if row.resource_type == "folder" {
+                        let dto = FolderDto {
+                            id: row.id.to_string(),
+                            name: row.name.clone(),
+                            path: String::new(), // cleared — share recipients must not see hierarchy
+                            parent_id: row.parent_id.map(|u| u.to_string()),
+                            owner_id: Some(row.owner_id.to_string()),
+                            created_at: row.created_at.timestamp() as u64,
+                            modified_at: row.modified_at.timestamp() as u64,
+                            is_root: false,
+                            icon_class: Arc::from("fas fa-folder"),
+                            icon_special_class: Arc::from("folder-icon"),
+                            category: Arc::from("Folder"),
+                        };
+                        FolderResourceItemDto {
+                            resource_type: ResourceTypeDto::Folder,
+                            resource: ResourceContentDto::Folder(dto),
+                        }
+                    } else {
+                        let mime = row
+                            .mime_type
+                            .as_deref()
+                            .unwrap_or("application/octet-stream");
+                        let size_bytes = row.size.max(0) as u64;
+                        let dto = FileDto {
+                            id: row.id.to_string(),
+                            name: row.name.clone(),
+                            path: String::new(),
+                            size: size_bytes,
+                            mime_type: Arc::from(mime),
+                            folder_id: row.parent_id.map(|u| u.to_string()),
+                            created_at: row.created_at.timestamp() as u64,
+                            modified_at: row.modified_at.timestamp() as u64,
+                            icon_class: Arc::from(icon_class_for(&row.name, mime)),
+                            icon_special_class: Arc::from(icon_special_class_for(&row.name, mime)),
+                            category: Arc::from(category_for(&row.name, mime)),
+                            size_formatted: format_file_size(size_bytes),
+                            owner_id: Some(row.owner_id.to_string()),
+                            sort_date: None,
+                            etag: String::new(),
+                        };
+                        FolderResourceItemDto {
+                            resource_type: ResourceTypeDto::File,
+                            resource: ResourceContentDto::File(dto),
+                        }
+                    }
+                })
+                .collect();
+
+            (
+                StatusCode::OK,
+                Json(FolderResourcesDto::with_cursor(items, next_cursor)),
+            )
+                .into_response()
+        }
+        Err(e) => AppError::from(e).into_response(),
+    }
+}

src/interfaces/api/handlers/grant_handler.rs

@@ -341,16 +341,18 @@ pub async fn list_shared_with_me(
             .into_response();
     }
 
-    // Decode cursor — discard it when the sort dimension changed to avoid
-    // keyset confusion across sort modes.
+    let reverse = q.reverse;
+
+    // Decode cursor — discard it when the sort dimension or direction changed
+    // to avoid keyset confusion across sort modes.
     let cursor = q
         .decode_cursor::<GrantCursor>()
-        .filter(|c| c.sort_by == sort_by);
+        .filter(|c| c.sort_by == sort_by && c.reverse == reverse);
 
     // Fetch paged summaries from the ACL engine.
     let (summaries, next_cursor) = match state
         .authorization
-        .list_incoming_resources_paged(subject, &kinds, limit, cursor, sort_by)
+        .list_incoming_resources_paged(subject, &kinds, limit, cursor, sort_by, reverse)
         .await
     {
         Ok(r) => r,

src/interfaces/api/routes.rs

@@ -58,9 +58,10 @@ use crate::interfaces::api::handlers::file_handler::{
     delete_file, download_file, get_file_metadata, get_thumbnail, list_files_query,
     move_file_simple, rename_file, upload_file_with_thumbnails, upload_thumbnail,
 };
+#[allow(deprecated)]
 use crate::interfaces::api::handlers::folder_handler::{
     create_folder, delete_folder_with_trash, download_folder_zip, get_folder, list_folder_contents,
-    list_folder_contents_paginated, list_folder_listing, list_root_folders,
+    list_folder_contents_paginated, list_folder_listing, list_folder_resources, list_root_folders,
     list_root_folders_paginated, move_folder, rename_folder,
 };
 use crate::interfaces::api::handlers::i18n_handler::{
@@ -155,6 +156,9 @@ pub fn create_public_api_routes(app_state: &Arc<AppState>) -> Router<Arc<AppStat
 /// These routes require authentication when auth is enabled.
 /// Receives the fully-assembled `AppState` and extracts all needed services
 /// from it, avoiding a long parameter list.
+// Legacy folder endpoints (contents, listing) are kept for backward-compat;
+// they are marked #[deprecated] so the OpenAPI spec shows them as deprecated.
+#[allow(deprecated)]
 pub fn create_api_routes(app_state: &Arc<AppState>) -> Router<Arc<AppState>> {
     // Extract services from the pre-built AppState
     let folder_service = app_state.applications.folder_service_concrete.clone();
@@ -195,6 +199,7 @@ pub fn create_api_routes(app_state: &Arc<AppState>) -> Router<Arc<AppState>> {
             "/{id}/contents/paginated",
             get(list_folder_contents_paginated),
         )
+        .route("/{id}/resources", get(list_folder_resources))
         .route("/{id}/rename", put(rename_folder))
         .route("/{id}/move", put(move_folder))
         .with_state(folder_service.clone());