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// +build fuzzy
package xlsx
import (
"archive/zip"
"bytes"
"encoding/xml"
"flag"
"fmt"
"io"
"log"
"math/rand"
"path/filepath"
"reflect"
"strconv"
"testing"
"time"
. "gopkg.in/check.v1"
)
type Fuzzy struct{}
var _ = Suite(&Fuzzy{})
var randseed *int64 = flag.Int64("test.seed", time.Now().Unix(), "Set the random seed of the test for repeatable results")
type tokenchange struct {
file bytes.Buffer
old xml.Token
new xml.Token
}
type filechange struct {
File *zip.Reader
Name string
Old xml.Token
New xml.Token
}
var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
var numbers = []rune("0123456789")
func randString(n int) []byte {
b := make([]rune, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return []byte(string(b))
}
func randInt(n int) []byte {
b := make([]rune, n)
for i := range b {
b[i] = numbers[rand.Intn(len(numbers))]
}
return []byte(string(b))
}
//This function creates variations on tokens without regards as to positions in the file.
func getTokenVariations(t xml.Token) []xml.Token {
var result []xml.Token = make([]xml.Token, 0)
switch t := t.(type) {
case xml.CharData:
{
//If the token is a number try some random number
if _, err := strconv.Atoi(string(t)); err == nil {
result = append(result, xml.CharData(randInt(rand.Intn(15))))
}
result = append(result, xml.CharData(randString(rand.Intn(100))))
return result
}
case xml.StartElement:
{
for k := range t.Attr {
if _, err := strconv.Atoi(string(t.Attr[k].Value)); err == nil {
start := xml.CopyToken(t).(xml.StartElement)
start.Attr[k].Value = string(randInt(rand.Intn(15)))
result = append(result, start)
}
start := xml.CopyToken(t).(xml.StartElement)
start.Attr[k].Value = string(randString(rand.Intn(100)))
result = append(result, start)
}
return result
}
default:
{
return make([]xml.Token, 0) // No variations on non char tokens yet
}
}
}
func variationsXML(f *zip.File) chan tokenchange {
result := make(chan tokenchange)
r, _ := f.Open()
xmlReader := xml.NewDecoder(r)
var tokenList []xml.Token
for {
if t, err := xmlReader.Token(); err == nil {
tokenList = append(tokenList, xml.CopyToken(t))
} else {
break
}
}
go func() {
//Over every token we want to break
for TokenToBreak := range tokenList {
//Get the ways we can break that token
for _, brokenToken := range getTokenVariations(tokenList[TokenToBreak]) {
var buf bytes.Buffer
xmlWriter := xml.NewEncoder(&buf)
//Now create an xml file where one token is broken
for currentToken, t := range tokenList {
if currentToken == TokenToBreak {
xmlWriter.EncodeToken(brokenToken)
} else {
xmlWriter.EncodeToken(t)
}
}
xmlWriter.Flush()
result <- tokenchange{buf, tokenList[TokenToBreak], brokenToken}
}
}
close(result)
}()
return result
}
func generateBrokenFiles(r *zip.Reader) chan filechange {
result := make(chan filechange)
go func() {
count := 0
//For every file in the zip we want variation on
for breakIndex, fileToBreak := range r.File {
if filepath.Ext(fileToBreak.Name) != ".xml" {
continue //We cannot create variations on non-xml files
}
variationCount := 0
//For every broken version of that file
for changedFile := range variationsXML(fileToBreak) {
variationCount++
var buffer bytes.Buffer
//Create a new xlsx file in memory
outZip := zip.NewWriter(&buffer)
w, err := outZip.Create(fileToBreak.Name)
if err != nil {
log.Fatal(err)
}
//Add modified file to xlsx
_, err = changedFile.file.WriteTo(w)
if err != nil {
log.Fatal("changedFile.file.WriteTo", err)
}
//Add other, unchanged, files.
for otherIndex, otherFile := range r.File {
if breakIndex == otherIndex {
continue
}
to, err := outZip.Create(otherFile.Name)
if err != nil {
log.Fatal("Could not add new file to xlsx due to", err)
}
from, err := otherFile.Open()
if err != nil {
log.Fatal("Could not open original file from template xlsx due to", err)
}
io.Copy(to, from)
from.Close()
}
outZip.Close()
//Return this combination of broken files
b := buffer.Bytes()
var res filechange
res.File, _ = zip.NewReader(bytes.NewReader(b), int64(len(b)))
res.Name = fileToBreak.Name
res.Old = changedFile.old
res.New = changedFile.new
result <- res
count++
}
}
close(result)
}()
return result
}
func Raises(f func()) (err interface{}) {
defer func() {
err = recover()
}()
err = nil
f()
return
}
func tokenToString(t xml.Token) string {
switch t := t.(type) {
case xml.CharData:
{
return string(t)
}
default:
{
return fmt.Sprint(t)
}
}
}
func (f *Fuzzy) TestRandomBrokenParts(c *C) {
if testing.Short() {
c.Log("This test, tests many versions of an xlsx file and might take a while, it is being skipped")
c.SucceedNow()
}
log.Println("Fuzzy test is using this -test.seed=" + strconv.FormatInt(*randseed, 10))
rand.Seed(*randseed)
template, err := zip.OpenReader("./testdocs/testfile.xlsx")
c.Assert(err, IsNil)
defer template.Close()
count := 0
for brokenFile := range generateBrokenFiles(&template.Reader) {
count++
if testing.Verbose() {
//If the library panics fatally it would be nice to know why
log.Println("Testing change to ", brokenFile.Name, " on token ", tokenToString(brokenFile.Old), " of type ", reflect.TypeOf(brokenFile.Old), " to ", tokenToString(brokenFile.New))
}
if e := Raises(func() { ReadZipReader(brokenFile.File) }); e != nil {
c.Log("Some file with random changes did raise an exception instead of returning an error", e)
c.Log("Testing change to ", brokenFile.Name, " on token ", tokenToString(brokenFile.Old), " of type ", reflect.TypeOf(brokenFile.Old), " to ", tokenToString(brokenFile.New))
c.FailNow()
}
}
c.Succeed()
}
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