Simple pagination middleware

server/api/middlewares/pagination.js

@@ -0,0 +1,35 @@
+import httpErrors from 'http-errors';
+var querystring = require('querystring');
+
+export default function pagination(options) {
+  return async function paginationMiddleware(ctx, next) {
+    const opts = {
+      ...{
+        defaultLimit: 15,
+        maxLimit: 100,
+      },
+      ...options,
+    };
+
+    let query = ctx.request.query;
+    let limit = 1000;//parseInt(query.limit);
+    let offset = parseInt(query.offset);
+    limit = isNaN(limit) ? opts.defaultLimit : limit;
+    offset = isNaN(offset) ? 0 : offset;
+
+    if (limit > opts.maxLimit) {
+      throw httpErrors.BadRequest(`Pagination limit is too large (max ${opts.maxLimit})`);
+    }
+
+    ctx.state.pagination = {
+      limit: limit,
+      offset: offset,
+    };
+
+    query.limit = ctx.state.pagination.limit;
+    query.offset = ctx.state.pagination.offset + query.limit;
+    ctx.state.pagination.nextPath = '/api' + ctx.request.path + '?' + querystring.stringify(query);
+
+    return next();
+  }
+};