1 files changed, 107 insertions, 0 deletions
diff --git a/view/json.go b/view/json.go
new file mode 100644
index 0000000..deaece2
--- /dev/null
+++ b/view/json.go
@@ -0,0 +1,107 @@
+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
+			}
+		},
+	)
+}