Add vendor (steam)

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

@@ -0,0 +1,47 @@
+package tradeoffer
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+type EscrowDuration struct {
+	DaysMyEscrow    uint32
+	DaysTheirEscrow uint32
+}
+
+func parseEscrowDuration(data []byte) (*EscrowDuration, error) {
+	// TODO: why we are using case insensitive matching?
+	myRegex := regexp.MustCompile("(?i)g_daysMyEscrow[\\s=]+(\\d+);")
+	theirRegex := regexp.MustCompile("(?i)g_daysTheirEscrow[\\s=]+(\\d+);")
+
+	myM := myRegex.FindSubmatch(data)
+	theirM := theirRegex.FindSubmatch(data)
+
+	if myM == nil || theirM == nil {
+		// check if access token is valid
+		notFriendsRegex := regexp.MustCompile(">You are not friends with this user<")
+		notFriendsM := notFriendsRegex.FindSubmatch(data)
+		if notFriendsM == nil {
+			return nil, errors.New("regexp does not match")
+		} else {
+			return nil, errors.New("you are not friends with this user")
+		}
+	}
+
+	myEscrow, err := strconv.ParseUint(string(myM[1]), 10, 32)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse my duration into uint: %v", err)
+	}
+	theirEscrow, err := strconv.ParseUint(string(theirM[1]), 10, 32)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse their duration into uint: %v", err)
+	}
+
+	return &EscrowDuration{
+		DaysMyEscrow:    uint32(myEscrow),
+		DaysTheirEscrow: uint32(theirEscrow),
+	}, nil
+}