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/
middleware.go
161 lines (130 loc) · 3.98 KB
/
middleware.go
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package fix
import (
"go/ast"
"go/parser"
"go/printer"
"go/token"
"io/ioutil"
"os"
"path/filepath"
"strings"
"golang.org/x/tools/go/ast/astutil"
)
//MiddlewareTransformer moves from our old middleware package to new one
type MiddlewareTransformer struct {
PackagesReplacement map[string]string
Aliases map[string]string
}
func (mw MiddlewareTransformer) transformPackages(r *Runner) error {
return filepath.Walk(".", mw.processFile)
}
func (mw MiddlewareTransformer) processFile(p string, fi os.FileInfo, err error) error {
er := onlyRelevantFiles(p, fi, err, func(p string) error {
if err := mw.rewriteMiddlewareUses(p); err != nil {
return err
}
fset, f, err := buildASTFor(p)
if err != nil {
if e := err.Error(); strings.Contains(e, "expected 'package', found 'EOF'") {
return nil
}
return err
}
//Replacing mw packages
for old, new := range mw.PackagesReplacement {
deleted := astutil.DeleteImport(fset, f, old)
if deleted {
astutil.AddNamedImport(fset, f, mw.Aliases[new], new)
}
}
if err := mw.addMissingRootMiddlewareImports(fset, f, p); err != nil {
return err
}
ast.SortImports(fset, f)
temp, err := writeTempResult(p, fset, f)
if err != nil {
return err
}
// rename the .temp to .go
return os.Rename(temp, p)
})
return er
}
func (mw MiddlewareTransformer) addMissingRootMiddlewareImports(fset *token.FileSet, f *ast.File, p string) error {
read, err := ioutil.ReadFile(p)
if err != nil {
return err
}
content := string(read)
astutil.DeleteImport(fset, f, "github.com/gobuffalo/buffalo/middleware")
if strings.Contains(content, "paramlogger.ParameterLogger") {
astutil.AddNamedImport(fset, f, "paramlogger", "github.com/gobuffalo/mw-paramlogger")
}
if strings.Contains(content, "popmw.Transaction") {
astutil.AddImport(fset, f, "github.com/gobuffalo/buffalo-pop/pop/popmw")
}
if strings.Contains(content, "contenttype.Add") || strings.Contains(content, "contenttype.Set") {
astutil.AddNamedImport(fset, f, "contenttype", "github.com/gobuffalo/mw-contenttype")
}
return ioutil.WriteFile(p, []byte(content), 0)
}
func (mw MiddlewareTransformer) rewriteMiddlewareUses(p string) error {
read, err := ioutil.ReadFile(p)
if err != nil {
return err
}
newContents := string(read)
newContents = strings.Replace(newContents, "middleware.SetContentType", "contenttype.Set", -1)
newContents = strings.Replace(newContents, "middleware.AddContentType", "contenttype.Add", -1)
newContents = strings.Replace(newContents, "middleware.ParameterLogger", "paramlogger.ParameterLogger", -1)
newContents = strings.Replace(newContents, "middleware.PopTransaction", "popmw.Transaction", -1)
newContents = strings.Replace(newContents, "ssl.ForceSSL", "forcessl.Middleware", -1)
err = ioutil.WriteFile(p, []byte(newContents), 0)
return err
}
func writeTempResult(name string, fset *token.FileSet, f *ast.File) (string, error) {
temp := name + ".temp"
w, err := os.Create(temp)
if err != nil {
return "", err
}
// write changes to .temp file, and include proper formatting.
err = (&printer.Config{Mode: printer.TabIndent | printer.UseSpaces, Tabwidth: 8}).Fprint(w, fset, f)
if err != nil {
return "", err
}
// close the writer
err = w.Close()
if err != nil {
return "", err
}
return temp, nil
}
func buildASTFor(p string) (*token.FileSet, *ast.File, error) {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, p, nil, parser.ParseComments)
return fset, f, err
}
//onlyRelevantFiles processes only .go files excluding folders like node_modules and vendor.
func onlyRelevantFiles(p string, fi os.FileInfo, err error, fn func(p string) error) error {
if err != nil {
return err
}
if fi.IsDir() {
base := filepath.Base(p)
if strings.HasPrefix(base, "_") {
return filepath.SkipDir
}
for _, n := range []string{"vendor", "node_modules", ".git"} {
if base == n {
return filepath.SkipDir
}
}
return nil
}
ext := filepath.Ext(p)
if ext != ".go" {
return nil
}
return fn(p)
}