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// 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 gosec
import (
"go/ast"
"go/types"
"strings"
)
// ImportTracker is used to normalize the packages that have been imported
// by a source file. It is able to differentiate between plain imports, aliased
// imports and init only imports.
type ImportTracker struct {
Imported map[string]string
Aliased map[string]string
InitOnly map[string]bool
}
// NewImportTracker creates an empty Import tracker instance
func NewImportTracker() *ImportTracker {
return &ImportTracker{
make(map[string]string),
make(map[string]string),
make(map[string]bool),
}
}
// TrackFile track all the imports used by the supplied file
func (t *ImportTracker) TrackFile(file *ast.File) {
for _, imp := range file.Imports {
path := strings.Trim(imp.Path.Value, `"`)
parts := strings.Split(path, "/")
if len(parts) > 0 {
name := parts[len(parts)-1]
t.Imported[path] = name
}
}
}
// TrackPackages tracks all the imports used by the supplied packages
func (t *ImportTracker) TrackPackages(pkgs ...*types.Package) {
for _, pkg := range pkgs {
t.Imported[pkg.Path()] = pkg.Name()
}
}
// TrackImport tracks imports and handles the 'unsafe' import
func (t *ImportTracker) TrackImport(n ast.Node) {
if imported, ok := n.(*ast.ImportSpec); ok {
path := strings.Trim(imported.Path.Value, `"`)
if imported.Name != nil {
if imported.Name.Name == "_" {
// Initialization only import
t.InitOnly[path] = true
} else {
// Aliased import
t.Aliased[path] = imported.Name.Name
}
}
if path == "unsafe" {
t.Imported[path] = path
}
}
}
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