Add vendor (steam)

vendor/github.com/Philipp15b/go-steam/tradeoffer/receipt.go

@@ -0,0 +1,35 @@
+package tradeoffer
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/Philipp15b/go-steam/economy/inventory"
+	"regexp"
+)
+
+type TradeReceiptItem struct {
+	AssetId   uint64 `json:"id,string"`
+	AppId     uint32
+	ContextId uint64
+	Owner     uint64 `json:",string"`
+	Pos       uint32
+	inventory.Description
+}
+
+func parseTradeReceipt(data []byte) ([]*TradeReceiptItem, error) {
+	reg := regexp.MustCompile("oItem =\\s+(.+?});")
+	itemMatches := reg.FindAllSubmatch(data, -1)
+	if itemMatches == nil {
+		return nil, fmt.Errorf("items not found\n")
+	}
+	items := make([]*TradeReceiptItem, 0, len(itemMatches))
+	for _, m := range itemMatches {
+		item := new(TradeReceiptItem)
+		err := json.Unmarshal(m[1], &item)
+		if err != nil {
+			return nil, err
+		}
+		items = append(items, item)
+	}
+	return items, nil
+}