feat: add pagination helper and integrate serde_urlencoded for query extraction

Cargo.lock

@@ -5446,6 +5446,7 @@ dependencies = [
  "sea-orm",
  "serde",
  "serde_json",
+ "serde_urlencoded",
  "tempfile",
  "tokio",
  "tower",

apps/api/Cargo.toml

@@ -30,6 +30,7 @@ jsonwebtoken = { version = "10.2.0", features = ["rust_crypto"] }
 uuid = { version = "1.19.0", features = ["v4", "serde", "fast-rng"] }
 tower-http = { version = "0.6.8", features = ["cors"] }
 reqwest = { version = "^0.12", features = ["json", "multipart", "stream"] }
+serde_urlencoded = { version = "0.7.1" }
 
 [dev-dependencies]
 tempfile = "3"

apps/api/src/routes/api.rs

@@ -1,5 +1,6 @@
 mod auth;
 mod health;
+mod helper;
 mod openapi;
 mod restricted;
 

apps/api/src/routes/api/helper.rs

@@ -0,0 +1 @@
+pub mod pagination;

apps/api/src/routes/api/helper/pagination.rs

@@ -0,0 +1,65 @@
+use axum::{
+    extract::FromRequestParts,
+    http::{StatusCode, request::Parts},
+};
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, utoipa::ToSchema)]
+/// Pagination parameters for API requests
+pub struct Pagination {
+    /// Page number (1-based)
+    pub page: u32,
+    /// Items per page
+    pub per_page: u32,
+}
+
+impl Default for Pagination {
+    fn default() -> Self {
+        Self {
+            page: 1,
+            per_page: 20,
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize, utoipa::ToSchema)]
+/// Pagination information included in API responses
+pub struct PaginationInfo {
+    /// Total number of items
+    pub total_items: u64,
+    /// Total number of pages
+    pub total_pages: u32,
+    /// Current page number
+    pub current_page: u32,
+    /// Items per page
+    pub per_page: u32,
+}
+
+/// Extractor for pagination parameters from query string
+pub struct ExtractPagination(pub Pagination);
+
+impl<S> FromRequestParts<S> for ExtractPagination
+where
+    S: Send + Sync,
+{
+    type Rejection = (StatusCode, &'static str);
+
+    async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
+        let query = parts.uri.query().unwrap_or("");
+        let pagination: Pagination = serde_urlencoded::from_str(query).unwrap_or_default();
+
+        // validation
+        if pagination.page == 0 {
+            return Err((StatusCode::BAD_REQUEST, "page must be greater than 0"));
+        }
+
+        if pagination.per_page < 1 || pagination.per_page > 100 {
+            return Err((
+                StatusCode::BAD_REQUEST,
+                "per_page must be between 1 and 100",
+            ));
+        }
+
+        Ok(ExtractPagination(pagination))
+    }
+}