besaid.zone
evan.jarrett.net
+7
-12
appview/email/email.go
+7
-12
appview/email/email.go
···
3
3
import (
4
4
"fmt"
5
5
"net"
6
-
"regexp"
6
+
"net/mail"
7
7
"strings"
8
8
9
9
"github.com/resend/resend-go/v2"
···
34
34
}
35
35
36
36
func IsValidEmail(email string) bool {
37
-
// Basic length check
38
-
if len(email) < 3 || len(email) > 254 {
37
+
// Reject whitespace (ParseAddress normalizes it away)
38
+
if strings.ContainsAny(email, " \t\n\r") {
39
39
return false
40
40
}
41
41
42
-
// Regular expression for email validation (RFC 5322 compliant)
43
-
pattern := `^[a-zA-Z0-9.!#$%&'*+/=?^_\x60{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$`
44
-
45
-
// Compile regex
46
-
regex := regexp.MustCompile(pattern)
47
-
48
-
// Check if email matches regex pattern
49
-
if !regex.MatchString(email) {
42
+
// Use stdlib RFC 5322 parser
43
+
addr, err := mail.ParseAddress(email)
44
+
if err != nil {
50
45
return false
51
46
}
52
47
53
48
// Split email into local and domain parts
54
-
parts := strings.Split(email, "@")
49
+
parts := strings.Split(addr.Address, "@")
55
50
domain := parts[1]
56
51
57
52
mx, err := net.LookupMX(domain)
+53
appview/email/email_test.go
+53
appview/email/email_test.go
···
1
+
package email
2
+
3
+
import (
4
+
"testing"
5
+
)
6
+
7
+
func TestIsValidEmail(t *testing.T) {
8
+
tests := []struct {
9
+
name string
10
+
email string
11
+
want bool
12
+
}{
13
+
// Valid emails using RFC 2606 reserved domains
14
+
{"standard email", "user@example.com", true},
15
+
{"single char local", "a@example.com", true},
16
+
{"dot in middle", "first.last@example.com", true},
17
+
{"multiple dots", "a.b.c@example.com", true},
18
+
{"plus tag", "user+tag@example.com", true},
19
+
{"numbers", "user123@example.com", true},
20
+
{"example.org", "user@example.org", true},
21
+
{"example.net", "user@example.net", true},
22
+
23
+
// Invalid format - rejected by mail.ParseAddress
24
+
{"empty string", "", false},
25
+
{"no at sign", "userexample.com", false},
26
+
{"no domain", "user@", false},
27
+
{"no local part", "@example.com", false},
28
+
{"double at", "user@@example.com", false},
29
+
{"just at sign", "@", false},
30
+
{"leading dot", ".user@example.com", false},
31
+
{"trailing dot", "user.@example.com", false},
32
+
{"consecutive dots", "user..name@example.com", false},
33
+
34
+
// Whitespace - rejected before parsing
35
+
{"space in local", "user @example.com", false},
36
+
{"space in domain", "user@ example.com", false},
37
+
{"tab", "user\t@example.com", false},
38
+
{"newline", "user\n@example.com", false},
39
+
40
+
// MX lookup - using RFC 2606 reserved TLDs (guaranteed no MX)
41
+
{"invalid TLD", "user@example.invalid", false},
42
+
{"test TLD", "user@mail.test", false},
43
+
}
44
+
45
+
for _, tt := range tests {
46
+
t.Run(tt.name, func(t *testing.T) {
47
+
got := IsValidEmail(tt.email)
48
+
if got != tt.want {
49
+
t.Errorf("IsValidEmail(%q) = %v, want %v", tt.email, got, tt.want)
50
+
}
51
+
})
52
+
}
53
+
}