From 08eaa08389aa09a351d3e1eb9a966a033236c155 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Paulo=20Sima=CC=83o?= <paulo@digitalcircle.com.br>
Date: Wed, 29 Sep 2021 21:28:45 -0300
Subject: [PATCH] 1st ver

---
 .gitignore      |  2 ++
 README.md       | 22 ++++++++++++++++++++
 cpf/lib.go      | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
 cpf/lib_test.go | 23 +++++++++++++++++++++
 go.mod          |  3 +++
 5 files changed, 104 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 cpf/lib.go
 create mode 100644 cpf/lib_test.go
 create mode 100644 go.mod

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d48c759
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.idea
+.vscode
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f011391
--- /dev/null
+++ b/README.md
@@ -0,0 +1,22 @@
+# Validators
+
+Package with multiple complex validation entities (only CPF now)
+
+Usage:
+
+```go
+package main
+
+import (
+	"go.digitalcircle.com.br/open/validators/cpf"
+	"log"
+)
+
+func main() {
+	acpf := "401.852.780-27"
+	if cpf.Check(acpf) {
+		log.Printf("CPF OK: %s", cpf.Format(acpf))
+	}
+}
+
+```
\ No newline at end of file
diff --git a/cpf/lib.go b/cpf/lib.go
new file mode 100644
index 0000000..c58828f
--- /dev/null
+++ b/cpf/lib.go
@@ -0,0 +1,54 @@
+package cpf
+
+import (
+	"strconv"
+	"unicode"
+)
+
+//Gets a string and formats is as CPF
+func Format(s string) string {
+	raw := Strip(s)
+	ret := raw[0:3] + "." + raw[3:6] + "." + raw[6:9] + "-" + raw[9:11]
+	return ret
+
+}
+
+//Removes all non-digit symbols
+func Strip(s string) string {
+	ret := ""
+	for _, v := range s {
+		if unicode.IsDigit(v) {
+			ret = ret + string(v)
+		}
+	}
+	return ret
+}
+
+//Checks if verification digit are respected
+func Check(s string) bool {
+	raw := Strip(s)
+	nums := make([]int, 0)
+	for _, v := range raw {
+		i, _ := strconv.Atoi(string(v))
+		nums = append(nums, i)
+	}
+
+	d1 := 0
+	mul := 10
+	for _, v := range nums[0 : len(nums)-2] {
+		d1 = d1 + (v * mul)
+		mul--
+	}
+	mod1 := (d1 * 10) % 11
+
+	d2 := 0
+	mul = 11
+	for _, v := range nums[0 : len(nums)-2] {
+		d2 = d2 + (v * mul)
+		mul--
+	}
+	d2 = d2 + (mod1 * mul)
+
+	mod2 := (d2 * 10) % 11
+	return mod1 == nums[len(nums)-2] && mod2 == nums[len(nums)-1]
+}
diff --git a/cpf/lib_test.go b/cpf/lib_test.go
new file mode 100644
index 0000000..aa0b4dc
--- /dev/null
+++ b/cpf/lib_test.go
@@ -0,0 +1,23 @@
+package cpf
+
+import (
+	"log"
+	"testing"
+)
+
+func TestFormat(t *testing.T) {
+	log.Printf(Format("03794020685"))
+}
+
+func TestCheck(t *testing.T) {
+	for _, v := range []string{
+		"377.100.400-47",
+		"377.100.400-46",
+		"845.846.910-37",
+		"845.846.910-17",
+	} {
+		ret := Check(v)
+		log.Printf("%s=>%v", v, ret)
+	}
+
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..468be16
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module go.digitalcircle.com.br/open/validators
+
+go 1.17