61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
// package middleare contains all the middleware function to use in the API.
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package middleware
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import (
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"strconv"
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"strings"
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"github.com/gofiber/fiber/v2"
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"github.com/wormhole-foundation/wormhole-explorer/api/internal/pagination"
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"github.com/wormhole-foundation/wormhole-explorer/api/response"
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)
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// ExtractPagination parses pagination-related query parameters.
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func ExtractPagination(ctx *fiber.Ctx) (*pagination.Pagination, error) {
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// get page number from query params
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var pageNumber *int64
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if param := ctx.Query("page"); param != "" {
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n, err := strconv.ParseInt(param, 10, 64)
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if err != nil || n < 0 {
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msg := `parameter 'page' must be a non-negative integer`
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return nil, response.NewInvalidParamError(ctx, msg, err)
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}
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pageNumber = &n
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}
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// get page size from query params
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var pageSize *int64
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if param := ctx.Query("pageSize"); param != "" {
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n, err := strconv.ParseInt(param, 10, 64)
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if err != nil || n <= 0 {
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msg := `parameter 'pageSize' must be a positive integer`
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return nil, response.NewInvalidParamError(ctx, msg, err)
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}
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pageSize = &n
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}
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// get sort order from query params
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var sortOrder string
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if param := strings.ToUpper(ctx.Query("sortOrder", "DESC")); param != "" {
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if param != "ASC" && param != "DESC" {
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msg := `parameter 'sortOrder' must either be 'ASC' or 'DESC'`
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return nil, response.NewInvalidParamError(ctx, msg, nil)
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}
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sortOrder = param
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}
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// build the result and return
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p := pagination.Default()
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if sortOrder != "" {
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p.SetSortOrder(sortOrder)
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}
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if pageSize != nil {
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p.SetLimit(*pageSize)
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}
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if pageNumber != nil {
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p.SetSkip(p.Limit * *pageNumber)
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}
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return p, nil
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}
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