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add alphanumeric function #24

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14 changes: 14 additions & 0 deletions sanitize.go
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import (
"html"
"html/template"
"io"
"log"
"path"
"regexp"
"strings"
Expand Down Expand Up @@ -305,6 +306,19 @@ func Accents(s string) string {
return b.String()
}

// Get alphanumeric strings only
func Alphanumeric(s string) string {

// Make a Regex to say we only want
reg, err := regexp.Compile("[^a-zA-Z0-9]+")
if err != nil {
log.Fatal(err)
}
processedString := reg.ReplaceAllString(s, "")

return processedString
}

var (
// If the attribute contains data: or javascript: anywhere, ignore it
// we don't allow this in attributes as it is so frequently used for xss
Expand Down
26 changes: 26 additions & 0 deletions sanitize_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -234,3 +234,29 @@ func BenchmarkHTMLAllowed(b *testing.B) {
}
}
}

var alphanumerics = []Test{
{"#$ferf*", "ferf"},
{"aall$%", "aall"},
{"EFFFG^&", "EFFFG"},
}

func TestAlphanumeric(t *testing.T) {
for _, test := range alphanumerics {
output := Alphanumeric(test.input)
if output != test.expected {
t.Fatalf(Format, test.input, test.expected, output)
}
}
}

func BenchmarkAlphanumeric(b *testing.B) {
for i := 0; i < b.N; i++ {
for _, test := range alphanumerics {
output := Alphanumeric(test.input)
if output != test.expected {
b.Fatalf(Format, test.input, test.expected, output)
}
}
}
}