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|
package view
import (
"encoding/json"
"io"
"net/http"
"strconv"
"xengineering.eu/ceres/model"
)
func CreateJSON[O model.Object](db *model.DB, constructor func() model.Object) http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
buf, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, "Request body could not be read: "+err.Error(), http.StatusBadRequest)
return
}
object := constructor()
err = json.Unmarshal(buf, &object)
if err != nil {
http.Error(w, "JSON could not be parsed: "+err.Error(), http.StatusBadRequest)
return
}
err = db.Transaction(object.Create)
if err != nil {
http.Error(w, "Object could not be saved to database: "+err.Error(), http.StatusBadRequest)
return
}
},
)
}
func ReadJSON[O model.Object](db *model.DB, constructor func() model.Object) http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
object := constructor()
id, err := strconv.Atoi(r.PathValue("id"))
if err == nil {
object.SetID(id)
}
err = db.Transaction(object.Read)
if err != nil {
http.Error(w, "Object could not be read from database: "+err.Error(), http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(object)
if err != nil {
http.Error(w, "Object could not be encoded to JSON: "+err.Error(), http.StatusBadRequest)
return
}
},
)
}
func UpdateJSON[O model.Object](db *model.DB, constructor func() model.Object) http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
buf, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, "Request body could not be read: "+err.Error(), http.StatusBadRequest)
return
}
object := constructor()
err = json.Unmarshal(buf, &object)
if err != nil {
http.Error(w, "JSON could not be parsed: "+err.Error(), http.StatusBadRequest)
return
}
err = db.Transaction(object.Update)
if err != nil {
http.Error(w, "Object could not be updated in database: "+err.Error(), http.StatusBadRequest)
return
}
},
)
}
func DeleteJSON[O model.Object](db *model.DB, constructor func() model.Object) http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
object := constructor()
id, err := strconv.Atoi(r.PathValue("id"))
if err != nil {
http.Error(w, "ID of object could not be parsed to an integer: "+err.Error(), http.StatusBadRequest)
return
}
object.SetID(id)
err = db.Transaction(object.Delete)
if err != nil {
http.Error(w, "Object could not be deleted from database: "+err.Error(), http.StatusBadRequest)
return
}
},
)
}
|
