evan.jarrett.net
forked from
tangled.org/core
Monorepo for Tangled — https://tangled.org
appview/email: replace regex check with mail.ParseAddress
Signed-off-by: Evan Jarrett <evan@evanjarrett.com>
+60
-12
+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"
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7
"strings"
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8
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9
"github.com/resend/resend-go/v2"
···
34
34
}
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func IsValidEmail(email string) bool {
37
-
// Basic length check
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-
if len(email) < 3 || len(email) > 254 {
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+
// Reject whitespace (ParseAddress normalizes it away)
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+
if strings.ContainsAny(email, " \t\n\r") {
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return false
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}
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-
// Regular expression for email validation (RFC 5322 compliant)
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pattern := `^[a-zA-Z0-9.!#$%&'*+/=?^_\x60{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$`
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-
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// Compile regex
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-
regex := regexp.MustCompile(pattern)
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-
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// Check if email matches regex pattern
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-
if !regex.MatchString(email) {
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+
// Use stdlib RFC 5322 parser
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+
addr, err := mail.ParseAddress(email)
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+
if err != nil {
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return false
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}
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// Split email into local and domain parts
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-
parts := strings.Split(email, "@")
49
+
parts := strings.Split(addr.Address, "@")
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domain := parts[1]
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51
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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"
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+
)
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+
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+
func TestIsValidEmail(t *testing.T) {
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+
tests := []struct {
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+
name string
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+
email string
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want bool
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+
}{
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+
// Valid emails using RFC 2606 reserved domains
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+
{"standard email", "user@example.com", true},
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+
{"single char local", "a@example.com", true},
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+
{"dot in middle", "first.last@example.com", true},
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+
{"multiple dots", "a.b.c@example.com", true},
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+
{"plus tag", "user+tag@example.com", true},
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{"numbers", "user123@example.com", true},
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{"example.org", "user@example.org", true},
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{"example.net", "user@example.net", true},
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+
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+
// Invalid format - rejected by mail.ParseAddress
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+
{"empty string", "", false},
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+
{"no at sign", "userexample.com", false},
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+
{"no domain", "user@", false},
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+
{"no local part", "@example.com", false},
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+
{"double at", "user@@example.com", false},
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+
{"just at sign", "@", false},
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+
{"leading dot", ".user@example.com", false},
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+
{"trailing dot", "user.@example.com", false},
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+
{"consecutive dots", "user..name@example.com", false},
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+
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+
// Whitespace - rejected before parsing
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+
{"space in local", "user @example.com", false},
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+
{"space in domain", "user@ example.com", false},
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+
{"tab", "user\t@example.com", false},
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+
{"newline", "user\n@example.com", false},
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+
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// MX lookup - using RFC 2606 reserved TLDs (guaranteed no MX)
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+
{"invalid TLD", "user@example.invalid", false},
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{"test TLD", "user@mail.test", false},
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+
}
44
+
45
+
for _, tt := range tests {
46
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t.Run(tt.name, func(t *testing.T) {
47
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got := IsValidEmail(tt.email)
48
+
if got != tt.want {
49
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t.Errorf("IsValidEmail(%q) = %v, want %v", tt.email, got, tt.want)
50
+
}
51
+
})
52
+
}
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+
}