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sanitization.go
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sanitization.go
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// Copyright (c) 2023 The Go-Enjin Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package request
import (
"net/http"
"net/mail"
"net/url"
"strings"
"github.com/go-enjin/be/pkg/forms"
"github.com/go-enjin/be/pkg/regexps"
)
func QueryFormValue(r *http.Request, key string) (value string) {
if r.Method == http.MethodPost {
value = r.FormValue(key)
} else {
value = r.URL.Query().Get(key)
}
return
}
// SafeParseForm sanitizes all r.Form values and returns a flat form context.Context with only the first value of each
// key included (similar to r.FormValue)
func SafeParseForm(r *http.Request) (form map[string]interface{}) {
_ = r.ParseForm()
sanitized := make(url.Values)
form = make(map[string]interface{})
for key, values := range r.Form {
for _, v := range values {
sanitized[key] = append(sanitized[key], forms.StrictSanitize(v))
}
if len(sanitized[key]) > 0 {
form[key] = sanitized[key][0]
}
}
r.Form = sanitized
return
}
func SafeQueryFormValue(r *http.Request, key string) (sanitized string) {
sanitized = forms.StrictSanitize(QueryFormValue(r, key))
return
}
func SafeQueryFormEmail(r *http.Request, key string) (address string) {
sanitized := forms.StrictSanitize(QueryFormValue(r, key))
if parsed, err := mail.ParseAddress(sanitized); err == nil {
address = strings.ToLower(parsed.Address)
}
return
}
func SafeQueryFormHash10(r *http.Request, key string) (shasum string) {
sanitized := forms.StrictSanitize(QueryFormValue(r, key))
if regexps.RxHash10.MatchString(sanitized) {
m := regexps.RxHash10.FindAllStringSubmatch(sanitized, 1)
shasum = m[0][1]
}
return
}
func SafeQueryFormSixDigits(r *http.Request, key string) (digits string) {
sanitized := forms.StrictSanitize(QueryFormValue(r, key))
if regexps.RxAtLeastSixDigits.MatchString(sanitized) {
m := regexps.RxAtLeastSixDigits.FindAllStringSubmatch(sanitized, 1)
digits = m[0][1]
}
return
}