40 lines
952 B
Go
40 lines
952 B
Go
package middleware
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import (
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"net/http"
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"strconv"
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)
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// PaginatedHandlerFunc is a handler for endpoints that require pagination.
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type PaginatedHandlerFunc func(int, int, http.ResponseWriter, *http.Request)
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// HandlePagination is a middleware handler that pulls pagination values
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// and passes them along.
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func HandlePagination(handler PaginatedHandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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// Default 50 items per page
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limitString := r.URL.Query().Get("limit")
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if limitString == "" {
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limitString = "50"
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}
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limit, err := strconv.Atoi(limitString)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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// Default first page 0
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offsetString := r.URL.Query().Get("offset")
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if offsetString == "" {
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offsetString = "0"
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}
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offset, err := strconv.Atoi(offsetString)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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handler(offset, limit, w, r)
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}
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}
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