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escape.go
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escape.go
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// MIT License
// Copyright (c) The RAI Authors
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package helpers
import (
"bytes"
"encoding/json"
"errors"
"html"
"io"
"strings"
"github.com/labstack/echo/v4"
)
func PostDataStripTags(c echo.Context, trimSpace bool) (map[string]interface{}, error) {
// Hold the POST json parameters as an interface
var data interface{}
// Hold the POST data as a map with string index
var postdatamap map[string]interface{}
// Get Content-Type parameter from request header
contentType := c.Request().Header.Get("Content-Type")
if strings.Contains(strings.ToLower(contentType), "application/json") {
// XXX: IMPORTANT - c.Request().Body is a buffer, which means that once it has been read, it cannot be read again.
if c.Request().Body != nil {
var err error
bodyBytes := bytes.NewBuffer(make([]byte, 0))
reader := io.TeeReader(c.Request().Body, bodyBytes)
if err = json.NewDecoder(reader).Decode(&data); err != nil {
var syntaxError *json.SyntaxError
var unmarshalTypeError *json.UnmarshalTypeError
// XXX: IMPORTANT - JSON Syntax error handling
switch {
// Request body contains badly-formed JSON (at position %d), syntaxError.Offset
case errors.As(err, &syntaxError):
return nil, err
// Request body contains badly-formed JSON
case errors.Is(err, io.ErrUnexpectedEOF):
return nil, err
// Request body contains an invalid value for the %q field (at position %d)", unmarshalTypeError.Field, unmarshalTypeError.Offset
case errors.As(err, &unmarshalTypeError):
return nil, err
// Request body is empty
case errors.Is(err, io.EOF):
return nil, err
default:
return nil, err
}
}
// Restore the io.ReadCloser to its original state so that we can read c.Request().Body somewhere else
c.Request().Body = io.NopCloser(bodyBytes)
} else {
return nil, errors.New("ERROR: empty request body")
}
data = InterfaceStripTags(data, trimSpace)
// XXX: IMPORTANT - Here we will check again that we able to decode the JSON and load the data into a map[string]interface.
switch v := data.(type) {
case map[string]interface{}:
postdatamap = v
default:
return nil, errors.New("ERROR: JSON syntax error")
}
}
return postdatamap, nil
}
func InterfaceStripTags(data interface{}, trimSpace bool) interface{} {
if values, ok := data.([]interface{}); ok {
for i := range values {
data.([]interface{})[i] = InterfaceStripTags(values[i], trimSpace)
}
} else if values, ok := data.(map[string]interface{}); ok {
for k, v := range values {
data.(map[string]interface{})[k] = InterfaceStripTags(v, trimSpace)
}
} else if value, ok := data.(string); ok {
if trimSpace {
value = strings.TrimSpace(value)
}
data = html.EscapeString(value)
}
return data
}
// Structure is a data type, so you must pass structure address (&) to the following function as the first parameter.
// Example:
// test := struct {
// Firstname string
// Lastname string
// Age int
// }{
// Firstname: "Taro",
// Lastname: "<script>alert()</script>Yamada",
// Age: 40,
// }
// helpers.StructStripTags(&test, true)
func StructStripTags(data interface{}, trimSpace bool) error {
bytes, err := json.Marshal(data)
if err != nil {
return err
}
var mapSI map[string]interface{}
if err := json.Unmarshal(bytes, &mapSI); err != nil {
return err
}
mapSI = InterfaceStripTags(mapSI, trimSpace).(map[string]interface{})
bytes2, err := json.Marshal(mapSI)
if err != nil {
return err
}
if err := json.Unmarshal(bytes2, data); err != nil {
return err
}
return nil
}