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// Copyright 2017 Google Inc.
//
// 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.
// The identify_license program tries to identify the license type of an
// unknown license. The file containing the license text is specified on the
// command line. Multiple license files can be analyzed with a single command.
// The type of the license is returned along with the confidence level of the
// match. The confidence level is between 0.0 and 1.0, with 1.0 indicating an
// exact match and 0.0 indicating a complete mismatch. The results are sorted
// by confidence level.
//
// $ identifylicense LICENSE1 LICENSE2
// LICENSE2: MIT (confidence: 0.987)
// LICENSE1: BSD-2-Clause (confidence: 0.833)
package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"path/filepath"
"sort"
"time"
"github.com/google/licenseclassifier"
"github.com/google/licenseclassifier/tools/identify_license/backend"
)
var (
headers = flag.Bool("headers", false, "match license headers")
forbiddenOnly = flag.Bool("forbidden", false, "identify using forbidden licenses archive")
threshold = flag.Float64("threshold", licenseclassifier.DefaultConfidenceThreshold, "confidence threshold")
timeout = flag.Duration("timeout", 24*time.Hour, "timeout before giving up on classifying a file.")
)
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage: %s <licensefile> ...
Identify an unknown license.
Options:
`, filepath.Base(os.Args[0]))
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
be, err := backend.New(*threshold, *forbiddenOnly)
if err != nil {
be.Close()
log.Fatalf("cannot create license classifier: %v", err)
}
ctx, cancel := context.WithTimeout(context.Background(), *timeout)
defer cancel()
if errs := be.ClassifyLicensesWithContext(ctx, flag.Args(), *headers); errs != nil {
be.Close()
for _, err := range errs {
log.Printf("classify license failed: %v", err)
}
log.Fatal("cannot classify licenses")
}
results := be.GetResults()
if len(results) == 0 {
be.Close()
log.Fatal("Couldn't classify license(s)")
}
sort.Sort(results)
for _, r := range results {
fmt.Printf("%s: %s (confidence: %v, offset: %v, extent: %v)\n",
r.Filename, r.Name, r.Confidence, r.Offset, r.Extent)
}
be.Close()
}
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