initial commit

backend/middleware/json.go

@@ -0,0 +1,49 @@
+package middleware
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"git.red-panda.pet/pandaware/house/backend/router"
+)
+
+func ParseJSONBody[T any](ctx *router.Context) error {
+	contentType := ctx.Request.Header.Get("Content-Type")
+	if contentType != "application/json" {
+		return ctx.GenericError(nil, http.StatusBadRequest)
+	}
+
+	var body T
+
+	dec := json.NewDecoder(ctx.Request.Body)
+	err := dec.Decode(&body)
+	if err != nil {
+		return ctx.GenericError(err, http.StatusBadRequest)
+	}
+
+	ctx.With(jsonBodyKey, body)
+
+	return nil
+}
+
+func ParseJSONBodyWithValidator[T any](
+	ctx *router.Context,
+	r router.ValidatedBodyRoute,
+	validator func(value T) error,
+) error {
+	err := ParseJSONBody[T](ctx)
+	if err != nil {
+		return err
+	}
+	body := JSONBody[T](r, ctx)
+	return validator(body)
+}
+
+func JSONBody[T any](r router.ValidatedBodyRoute, ctx *router.Context) T {
+	body, ok := ctx.Value(jsonBodyKey).(T)
+	if !ok {
+		panic(errors.New("middleware.JSONBody cannot be used with a route that doesn't implement router.ValidatedBodyRoute"))
+	}
+	return body
+}