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symbols.go
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symbols.go
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package main
import (
"encoding/json"
"fmt"
"go/ast"
"go/build"
"go/parser"
"go/token"
"io/ioutil"
"log"
"os"
"path/filepath"
"reflect"
"sort"
"strings"
"golang.org/x/tools/refactor/importgraph"
"golang.org/x/tools/refactor/rename"
)
var IgnoreMethods = map[string]bool{"main": true, "init": true}
type symbolRenameReq struct {
OldName string
NewName string
}
func ObfuscateSymbols(gopath string, n NameHasher) error {
removeDoNotEdit(gopath)
reverseLookupMap := map[string]string{}
renames, err := topLevelRenames(gopath, n)
if err != nil {
return fmt.Errorf("top-level renames: %s", err)
}
if err := runRenames(gopath, renames, reverseLookupMap); err != nil {
return fmt.Errorf("top-level renaming: %s", err)
}
renames, err = methodRenames(gopath, n)
if err != nil {
return fmt.Errorf("method renames: %s", err)
}
if err := runRenames(gopath, renames, reverseLookupMap); err != nil {
return fmt.Errorf("method renaming: %s", err)
}
renames, err = topLevelParamRenames(gopath, n)
if err != nil {
return fmt.Errorf("top-level renames: %s", err)
}
if err := runRenames(gopath, renames, reverseLookupMap); err != nil {
return fmt.Errorf("top-level renaming: %s", err)
}
jsonString, _ := json.Marshal(reverseLookupMap)
fileErr := ioutil.WriteFile(gopath+"/"+"map.json", jsonString, 0777)
if fileErr != nil {
// TODO: Consider this case.
return nil
}
return nil
}
func runRenames(gopath string, renames []symbolRenameReq, m map[string]string) error {
ctx := build.Default
ctx.GOPATH = gopath
for _, r := range renames {
fmt.Println(r.OldName)
fmt.Println(r.NewName)
oldName := strings.Split(r.OldName, ".")[1]
if len(strings.Split(oldName, "::")) > 1 {
oldName = strings.Split(oldName, "::")[1]
}
if len(strings.Split(r.OldName, ".")) == 3 {
oldName = strings.Split(r.OldName, ".")[1] + "." + strings.Split(r.OldName, ".")[2]
}
m[r.NewName] = oldName
if err := rename.Main(&ctx, "", r.OldName, r.NewName); err != nil {
log.Println("Error running renames proceding...", err)
continue
}
}
return nil
}
func topLevelParamRenames(gopath string, n NameHasher) ([]symbolRenameReq, error) {
srcDir := filepath.Join(gopath, "src")
res := map[symbolRenameReq]int{}
err := filepath.Walk(srcDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() && containsUnsupportedCode(path) {
return filepath.SkipDir
}
if !isGoFile(path) {
return nil
}
pkgPath, err := filepath.Rel(srcDir, filepath.Dir(path))
if err != nil {
return err
}
set := token.NewFileSet()
file, err := parser.ParseFile(set, path, nil, 0)
if err != nil {
return err
}
for _, decl := range file.Decls {
switch d := decl.(type) {
case *ast.FuncDecl:
if !IgnoreMethods[d.Name.Name] && d.Recv == nil {
for _, field := range d.Type.Params.List {
for _, name := range field.Names {
prefix := "\"" + pkgPath + "\"."
oldName := prefix + d.Name.Name + "::" + name.Name
newName := n.Hash(name.Name)
res[symbolRenameReq{oldName, newName}]++
}
}
}
}
}
return nil
})
return singleRenames(res), err
}
func topLevelRenames(gopath string, n NameHasher) ([]symbolRenameReq, error) {
srcDir := filepath.Join(gopath, "src")
res := map[symbolRenameReq]int{}
addRes := func(pkgPath, name string) {
prefix := "\"" + pkgPath + "\"."
oldName := prefix + name
newName := n.Hash(name)
res[symbolRenameReq{oldName, newName}]++
}
err := filepath.Walk(srcDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() && containsUnsupportedCode(path) {
return filepath.SkipDir
}
if !isGoFile(path) {
return nil
}
pkgPath, err := filepath.Rel(srcDir, filepath.Dir(path))
if err != nil {
return err
}
set := token.NewFileSet()
file, err := parser.ParseFile(set, path, nil, 0)
if err != nil {
return err
}
for _, decl := range file.Decls {
switch d := decl.(type) {
case *ast.FuncDecl:
if !IgnoreMethods[d.Name.Name] && d.Recv == nil {
addRes(pkgPath, d.Name.Name)
}
case *ast.GenDecl:
for _, spec := range d.Specs {
switch spec := spec.(type) {
case *ast.TypeSpec:
if reflect.TypeOf(spec.Type).String() == "*ast.StructType" {
structType := spec.Type.(*ast.StructType)
for _, f := range structType.Fields.List {
for _, n := range f.Names {
addRes(pkgPath, spec.Name.Name+"."+n.Name)
}
}
}
addRes(pkgPath, spec.Name.Name)
case *ast.ValueSpec:
for _, name := range spec.Names {
addRes(pkgPath, name.Name)
}
}
}
}
}
return nil
})
return singleRenames(res), err
}
func methodRenames(gopath string, n NameHasher) ([]symbolRenameReq, error) {
exclude, err := interfaceMethods(gopath)
if err != nil {
return nil, err
}
srcDir := filepath.Join(gopath, "src")
res := map[symbolRenameReq]int{}
err = filepath.Walk(srcDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() && containsUnsupportedCode(path) {
return filepath.SkipDir
}
if !isGoFile(path) {
return nil
}
pkgPath, err := filepath.Rel(srcDir, filepath.Dir(path))
if err != nil {
return err
}
set := token.NewFileSet()
file, err := parser.ParseFile(set, path, nil, 0)
if err != nil {
return err
}
for _, decl := range file.Decls {
d, ok := decl.(*ast.FuncDecl)
if !ok || exclude[d.Name.Name] || d == nil {
continue
}
if d.Body != nil {
prefix := "\"" + pkgPath + "\"."
for _, rec := range d.Body.List {
var typeName = reflect.TypeOf(rec).String()
if typeName == "*ast.AssignStmt" {
var statement = rec.(*ast.AssignStmt)
for _, ident := range statement.Lhs {
if reflect.TypeOf(rec).String() == "*ast.Ident" {
var name = ident.(*ast.Ident)
if name.Name != "_" {
oldName := prefix + d.Name.Name + "::" + name.Name
newName := n.Hash(name.Name)
res[symbolRenameReq{oldName, newName}]++
}
}
}
} else if typeName == "*ast.DeclStmt" {
var statement = rec.(*ast.DeclStmt)
var declaration = statement.Decl.(*ast.GenDecl)
for _, spec := range declaration.Specs {
var valueSpec = spec.(*ast.ValueSpec)
for _, name := range valueSpec.Names {
if name.Name != "_" {
oldName := prefix + d.Name.Name + "::" + name.Name
newName := n.Hash(name.Name)
res[symbolRenameReq{oldName, newName}]++
}
}
}
} else if typeName == "*ast.ReturnStmt" {
var statement = rec.(*ast.ReturnStmt)
var results = statement.Results
for _, expr := range results {
// Ignore ast.BinaryExpr which is most likely created by this library as a string function.
if reflect.TypeOf(expr).String() == "*ast.Ident" {
var name = expr.(*ast.Ident)
if name.Obj != nil {
oldName := prefix + d.Name.Name + "::" + name.Name
newName := n.Hash(name.Name)
res[symbolRenameReq{oldName, newName}]++
}
} else {
fmt.Println("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
fmt.Println(reflect.TypeOf(expr))
fmt.Println(expr)
fmt.Println("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
}
}
} else {
fmt.Println("***********************************************")
fmt.Println(reflect.TypeOf(rec))
fmt.Println(rec)
fmt.Println("***********************************************")
}
}
}
if d.Recv != nil {
prefix := "\"" + pkgPath + "\"."
for _, rec := range d.Recv.List {
receiver := receiverString(prefix, rec)
if receiver == "" {
continue
}
oldName := receiver + "." + d.Name.Name
newName := n.Hash(d.Name.Name)
res[symbolRenameReq{oldName, newName}]++
}
}
}
return nil
})
return singleRenames(res), err
}
func interfaceMethods(gopath string) (map[string]bool, error) {
ctx := build.Default
ctx.GOPATH = gopath
forward, backward, _ := importgraph.Build(&ctx)
pkgs := map[string]bool{}
for _, m := range []importgraph.Graph{forward, backward} {
for x := range m {
pkgs[x] = true
}
}
res := map[string]bool{}
for pkgName := range pkgs {
pkg, err := ctx.Import(pkgName, gopath, 0)
if err != nil {
return nil, fmt.Errorf("import %s: %s", pkgName, err)
}
for _, fileName := range pkg.GoFiles {
sourcePath := filepath.Join(pkg.Dir, fileName)
set := token.NewFileSet()
file, err := parser.ParseFile(set, sourcePath, nil, 0)
if err != nil {
return nil, err
}
for _, decl := range file.Decls {
d, ok := decl.(*ast.GenDecl)
if !ok {
continue
}
for _, spec := range d.Specs {
spec, ok := spec.(*ast.TypeSpec)
if !ok {
continue
}
t, ok := spec.Type.(*ast.InterfaceType)
if !ok {
continue
}
for _, field := range t.Methods.List {
for _, name := range field.Names {
res[name.Name] = true
}
}
}
}
}
}
return res, nil
}
// singleRenames removes any rename requests which appear
// more than one time.
// This is necessary because of build constraints, which
// the refactoring API doesn't seem to properly support.
func singleRenames(multiset map[symbolRenameReq]int) []symbolRenameReq {
var res []symbolRenameReq
for x, count := range multiset {
if count == 1 {
res = append(res, x)
}
}
// Ensure depth first renaming.
sort.Slice(res, func(i, j int) bool {
return strings.Count(res[i].OldName, ".") > strings.Count(res[j].OldName, ".")
})
return res
}
// containsUnsupportedCode checks if a source directory
// contains assembly or CGO code, neither of which are
// supported by the refactoring API.
func containsUnsupportedCode(dir string) bool {
return containsAssembly(dir) || containsCGO(dir) || strings.Contains(dir, "github.com")
}
// containsAssembly checks if a source directory contains
// any assembly files.
// We cannot rename symbols in assembly-filled directories
// because of limitations of the refactoring API.
func containsAssembly(dir string) bool {
contents, _ := ioutil.ReadDir(dir)
for _, item := range contents {
if filepath.Ext(item.Name()) == ".s" {
return true
}
}
return false
}
// containsCGO checks if a package relies on CGO.
// We cannot rename symbols in packages that use CGO due
// to limitations of the refactoring API.
func containsCGO(dir string) bool {
listing, err := ioutil.ReadDir(dir)
if err != nil {
return false
}
for _, item := range listing {
if isGoFile(item.Name()) {
path := filepath.Join(dir, item.Name())
set := token.NewFileSet()
file, err := parser.ParseFile(set, path, nil, 0)
if err != nil {
return false
}
for _, spec := range file.Imports {
if spec.Path.Value == `"C"` {
return true
}
}
}
}
return false
}
// removeDoNotEdit removes comments that prevent gorename
// from working properly.
func removeDoNotEdit(dir string) error {
srcDir := filepath.Join(dir, "src")
return filepath.Walk(srcDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() || !isGoFile(path) {
return nil
}
f, err := os.OpenFile(path, os.O_RDWR, 0755)
if err != nil {
return err
}
defer f.Close()
content, err := ioutil.ReadAll(f)
if err != nil {
return err
}
set := token.NewFileSet()
file, err := parser.ParseFile(set, path, content, parser.ParseComments)
if err != nil {
return err
}
for _, comment := range file.Comments {
data := make([]byte, comment.End()-comment.Pos())
start := int(comment.Pos())
end := start + len(data)
data = content[start:end]
commentStr := string(data)
if strings.Contains(commentStr, "DO NOT EDIT") {
commentStr = strings.Replace(commentStr, "DO NOT EDIT", "XXXXXXXXXXX", -1)
if _, err := f.WriteAt([]byte(commentStr), int64(comment.Pos()-1)); err != nil {
return err
}
}
}
return nil
})
}
// receiverString gets the string representation of a
// method receiver so that the method can be renamed.
func receiverString(prefix string, rec *ast.Field) string {
if stringer, ok := rec.Type.(fmt.Stringer); ok {
return prefix + stringer.String()
} else if star, ok := rec.Type.(*ast.StarExpr); ok {
if stringer, ok := star.X.(fmt.Stringer); ok {
return "(*" + prefix + stringer.String() + ")"
}
}
return ""
}