add a new main to generate random bugs

1 files changed, 69 insertions, 0 deletions

diff --git a/vendor/github.com/icrowley/fake/credit_cards.go b/vendor/github.com/icrowley/fake/credit_cards.go
new file mode 100644
index 00000000..47d6ca72
--- /dev/null
+++ b/vendor/github.com/icrowley/fake/credit_cards.go
@@ -0,0 +1,69 @@
+package fake
+
+import (
+	"strings"
+
+	"strconv"
+)
+
+type creditCard struct {
+	vendor   string
+	length   int
+	prefixes []int
+}
+
+var creditCards = map[string]creditCard{
+	"visa":       {"VISA", 16, []int{4539, 4556, 4916, 4532, 4929, 40240071, 4485, 4716, 4}},
+	"mastercard": {"MasterCard", 16, []int{51, 52, 53, 54, 55}},
+	"amex":       {"American Express", 15, []int{34, 37}},
+	"discover":   {"Discover", 16, []int{6011}},
+}
+
+// CreditCardType returns one of the following credit values:
+// VISA, MasterCard, American Express and Discover
+func CreditCardType() string {
+	n := len(creditCards)
+	var vendors []string
+	for _, cc := range creditCards {
+		vendors = append(vendors, cc.vendor)
+	}
+
+	return vendors[r.Intn(n)]
+}
+
+// CreditCardNum generated credit card number according to the card number rules
+func CreditCardNum(vendor string) string {
+	if vendor != "" {
+		vendor = strings.ToLower(vendor)
+	} else {
+		var vendors []string
+		for v := range creditCards {
+			vendors = append(vendors, v)
+		}
+		vendor = vendors[r.Intn(len(vendors))]
+	}
+	card := creditCards[vendor]
+	prefix := strconv.Itoa(card.prefixes[r.Intn(len(card.prefixes))])
+	num := []rune(prefix)
+	for i := 0; i < card.length-len(prefix); i++ {
+		num = append(num, genCCDigit(num))
+	}
+	return string(num)
+}
+
+func genCCDigit(num []rune) rune {
+	sum := 0
+	for i := len(num) - 1; i >= 0; i-- {
+		n := int(num[i])
+		if i%2 != 0 {
+			sum += n
+		} else {
+			if n*2 > 9 {
+				sum += n*2 - 9
+			} else {
+				sum += n * 2
+			}
+		}
+	}
+	return rune(((sum/10+1)*10 - sum) % 10)
+}