From ded01e8dd0d1f46db473afe323b64c850d232dc4 Mon Sep 17 00:00:00 2001
From: lash <dev@holbrook.no>
Date: Sun, 12 Jan 2025 08:17:29 +0000
Subject: [PATCH] Initial commit

---
 go.mod               |  3 +++
 identity/address.go  | 15 +++++++++++++++
 identity/alias.go    | 15 +++++++++++++++
 identity/identity.go | 24 ++++++++++++++++++++++++
 phone/phone.go       | 16 ++++++++++++++++
 5 files changed, 73 insertions(+)
 create mode 100644 go.mod
 create mode 100644 identity/address.go
 create mode 100644 identity/alias.go
 create mode 100644 identity/identity.go
 create mode 100644 phone/phone.go

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5081e27
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.grassecon.net/grassrootseconomics/common
+
+go 1.23.4
diff --git a/identity/address.go b/identity/address.go
new file mode 100644
index 0000000..4e1a2bf
--- /dev/null
+++ b/identity/address.go
@@ -0,0 +1,15 @@
+package identity
+
+import (
+	"regexp"
+)
+// Define the regex patterns as constants
+const (
+	addressRegex = `^0x[a-fA-F0-9]{40}$`
+)
+
+// IsValidAddress checks if the given address is a valid Ethereum address
+func IsValidAddress(address string) bool {
+	match, _ := regexp.MatchString(addressRegex, address)
+	return match
+}
diff --git a/identity/alias.go b/identity/alias.go
new file mode 100644
index 0000000..195bcd5
--- /dev/null
+++ b/identity/alias.go
@@ -0,0 +1,15 @@
+package identity
+
+import (
+	"regexp"
+)
+
+const (
+	aliasRegex   = `^[a-zA-Z0-9]+$`
+)
+
+// IsValidAlias checks if the alias is a valid alias format
+func IsValidAlias(alias string) bool {
+	match, _ := regexp.MatchString(aliasRegex, alias)
+	return match
+}
diff --git a/identity/identity.go b/identity/identity.go
new file mode 100644
index 0000000..eac61aa
--- /dev/null
+++ b/identity/identity.go
@@ -0,0 +1,24 @@
+package identity
+
+import (
+	"fmt"
+
+	"git.grassecon.net/grassrootseconomics/common/phone"
+)
+
+// CheckRecipient validates the recipient format based on the criteria
+func CheckRecipient(recipient string) (string, error) {
+	if phone.IsValidPhoneNumber(recipient) {
+		return "phone number", nil
+	}
+
+	if IsValidAddress(recipient) {
+		return "address", nil
+	}
+
+	if IsValidAlias(recipient) {
+		return "alias", nil
+	}
+
+	return "", fmt.Errorf("invalid recipient: must be a phone number, address or alias")
+}
diff --git a/phone/phone.go b/phone/phone.go
new file mode 100644
index 0000000..f1e5510
--- /dev/null
+++ b/phone/phone.go
@@ -0,0 +1,16 @@
+package phone
+
+import (
+	"regexp"
+)
+
+// Define the regex patterns as constants
+const (
+	phoneRegex   = `^(?:\+254|254|0)?((?:7[0-9]{8})|(?:1[01][0-9]{7}))$`
+)
+
+// IsValidPhoneNumber checks if the given number is a valid phone number
+func IsValidPhoneNumber(phonenumber string) bool {
+	match, _ := regexp.MatchString(phoneRegex, phonenumber)
+	return match
+}