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analysis.go
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analysis.go
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// Copyright Istio Authors
//
// 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 main
import (
"fmt"
"io/ioutil"
"gopkg.in/src-d/go-license-detector.v2/licensedb"
"gopkg.in/src-d/go-license-detector.v2/licensedb/filer"
)
// analysisResult describes a license.
type analysisResult struct {
licenseName string
confidence float32
similarLicense string
similarityConfidence float32
}
// filerImpl implements filer.Filer to return the license text directly
// from the github.RepositoryLicense structure.
type filerImpl struct {
License string
}
func (f *filerImpl) ReadFile(name string) ([]byte, error) {
return ioutil.ReadFile(name)
}
func (f *filerImpl) ReadDir(dir string) ([]filer.File, error) {
// We only support root
if dir != "" {
return nil, nil
}
return []filer.File{{Name: f.License}}, nil
}
func (f *filerImpl) Close() {}
func analyzeLicense(path string) (analysisResult, error) {
res, err := licensedb.Detect(&filerImpl{License: path})
if err == licensedb.ErrNoLicenseFound {
return analysisResult{}, nil
}
if err != nil {
return analysisResult{}, fmt.Errorf("failed to detect license %v: %v", path, err)
}
// Find the highest matching license
var confidence float32
licenseName := ""
for id, v := range res {
if v > confidence {
confidence = v
licenseName = id
}
}
similarLicense := ""
var similarityConfidence float32 = 0.0
if confidence < 0.85 {
// Not enough confidence
similarLicense = licenseName
similarityConfidence = confidence
licenseName = ""
confidence = 0.0
}
return analysisResult{
licenseName: licenseName,
confidence: confidence,
similarLicense: similarLicense,
similarityConfidence: similarityConfidence,
}, nil
}