67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
package rest
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import (
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"encoding/json"
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"io"
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"log/slog"
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"net/http"
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"strconv"
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)
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const (
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maxRequestBody = 1 << 20
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defaultLimit = 50
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maxLimit = 200
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)
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type errorResponse struct {
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Error string `json:"error"`
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}
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func writeJson(w http.ResponseWriter, status int, value any) {
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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w.WriteHeader(status)
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if value == nil {
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return
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}
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if err := json.NewEncoder(w).Encode(value); err != nil {
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slog.Error("encode response", slog.String("op", "rest.writeJson"), slog.Any("error", err))
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}
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}
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func writeError(w http.ResponseWriter, status int, message string) {
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writeJson(w, status, errorResponse{Error: message})
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}
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func writeNoContent(w http.ResponseWriter) {
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w.WriteHeader(http.StatusNoContent)
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}
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func decodeJson(r *http.Request, dst any) error {
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decoder := json.NewDecoder(io.LimitReader(r.Body, maxRequestBody))
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decoder.DisallowUnknownFields()
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return decoder.Decode(dst)
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}
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func pagination(r *http.Request) (limit, offset int64) {
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limit = defaultLimit
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query := r.URL.Query()
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if value := query.Get("limit"); value != "" {
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if parsed, err := strconv.ParseInt(value, 10, 64); err == nil && parsed > 0 {
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limit = parsed
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}
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}
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if limit > maxLimit {
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limit = maxLimit
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}
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if value := query.Get("offset"); value != "" {
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if parsed, err := strconv.ParseInt(value, 10, 64); err == nil && parsed >= 0 {
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offset = parsed
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}
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}
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return limit, offset
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}
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