diff --git a/server/api/middlewares/pagination.js b/server/api/middlewares/pagination.js new file mode 100644 index 00000000..f436ab05 --- /dev/null +++ b/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(); + } +};