3 files changed, 101 insertions, 0 deletions
diff --git a/api/dto/entry.go b/api/dto/entry.go
new file mode 100644
index 0000000..85e39f3
--- /dev/null
+++ b/api/dto/entry.go
@@ -0,0 +1,9 @@
+package dto
+
+type CreateEntryRequest struct {
+	Title       string `json:"title"`
+	Kind        string `json:"kind"`
+	Url         string `json:"url"`
+	Description string `json:"description"`
+	Token       string `json:"token"`
+}
diff --git a/api/dto/response.go b/api/dto/response.go
new file mode 100644
index 0000000..2c13218
--- /dev/null
+++ b/api/dto/response.go
@@ -0,0 +1,38 @@
+package dto
+
+import "fmt"
+
+type Response interface {
+	Error() string
+	Status() int
+}
+
+type OkResponse struct {
+	Code int         `json:"code"`
+	Data interface{} `json:"data,omitempty"`
+}
+
+var _ Response = (*OkResponse)(nil)
+
+type ErrorResponse struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+var _ Response = (*ErrorResponse)(nil)
+
+func (r *OkResponse) Status() int {
+	return r.Code
+}
+
+func (r *OkResponse) Error() string {
+	return fmt.Sprintf("HTTP status %d", r.Code)
+}
+
+func (r *ErrorResponse) Status() int {
+	return r.Code
+}
+
+func (r *ErrorResponse) Error() string {
+	return fmt.Sprintf("HTTP status %d: %s", r.Code, r.Message)
+}
diff --git a/api/dto/util.go b/api/dto/util.go
new file mode 100644
index 0000000..651f026
--- /dev/null
+++ b/api/dto/util.go
@@ -0,0 +1,54 @@
+package dto
+
+import (
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var validate = validator.New(validator.WithRequiredStructEnabled())
+
+func ReadDto(r *http.Request, o interface{}) Response {
+	decoder := json.NewDecoder(r.Body)
+	if err := decoder.Decode(o); err != nil {
+		return &ErrorResponse{
+			Code:    http.StatusBadRequest,
+			Message: fmt.Errorf("Invalid request (%w)", err).Error(),
+		}
+	}
+
+	if err := validate.Struct(o); err != nil {
+		return &ErrorResponse{
+			Code:    http.StatusBadRequest,
+			Message: err.Error(),
+		}
+	}
+
+	return nil
+}
+
+func WrapResponseFunc(dtoFunc func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		WriteDto(w, r, dtoFunc(w, r))
+	}
+}
+
+func WriteDto(w http.ResponseWriter, r *http.Request, err error) {
+	if o, ok := err.(Response); ok {
+		data, err := json.Marshal(o)
+		if err != nil {
+			w.WriteHeader(500)
+			slog.Error("could not serialise JSON", "error", err)
+			return
+		}
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(o.Status())
+		w.Write(data)
+	} else {
+		w.WriteHeader(500)
+		slog.Error("internal server error handling request", "error", err)
+	}
+}