Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tools/license_checker/whitelist.go

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+
+	"github.com/coreos/go-semver/semver"
+)
+
+type whitelist []whitelistEntry
+
+type whitelistEntry struct {
+	Name     string
+	Version  *semver.Version
+	Operator string
+	License  string
+}
+
+var re = regexp.MustCompile(`^([<=>]+\s*)?([-\.\/\w]+)(@v[\d\.]+)?\s+([-\.\w]+)$`)
+
+func (w *whitelist) Parse(filename string) error {
+	file, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// Read file line-by-line and split by semicolon
+	lineno := 0
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		lineno++
+		if strings.HasPrefix(line, "#") {
+			// Comment
+			continue
+		}
+
+		groups := re.FindAllStringSubmatch(line, -1)
+		if len(groups) != 1 {
+			log.Printf("WARN: Ignoring not matching entry in line %d", lineno)
+			continue
+		}
+		group := groups[0]
+		if len(group) != 5 {
+			// Malformed
+			log.Printf("WARN: Ignoring malformed entry in line %d", lineno)
+			continue
+		}
+
+		// An entry has the form:
+		// [operator]<package name>[@version] [license SPDX]
+		var operator, version string
+		if group[1] != "" {
+			operator = strings.TrimSpace(group[1])
+		}
+		name := group[2]
+		if group[3] != "" {
+			version = strings.TrimSpace(group[3])
+			version = strings.TrimLeft(version, "@v")
+		}
+		license := strings.TrimSpace(group[4])
+
+		entry := whitelistEntry{Name: name, License: license, Operator: operator}
+		if version != "" {
+			entry.Version, err = semver.NewVersion(version)
+			if err != nil {
+				// Malformed
+				log.Printf("Ignoring malformed version in line %d: %v", lineno, err)
+				continue
+			}
+			if entry.Operator == "" {
+				entry.Operator = "="
+			}
+		}
+		*w = append(*w, entry)
+	}
+
+	return scanner.Err()
+}
+
+func (w *whitelist) Check(pkg, version, spdx string) (ok, found bool) {
+	v := strings.TrimSpace(version)
+	v = strings.TrimPrefix(v, "v")
+	if v == "" {
+		return false, false
+	}
+	pkgver := *semver.New(v)
+
+	for _, entry := range *w {
+		if entry.Name != pkg {
+			continue
+		}
+
+		var match bool
+		switch entry.Operator {
+		case "":
+			match = true
+		case "=":
+			match = pkgver.Equal(*entry.Version)
+		case "<":
+			match = pkgver.LessThan(*entry.Version)
+		case "<=":
+			match = pkgver.LessThan(*entry.Version) || pkgver.Equal(*entry.Version)
+		case ">":
+			match = !pkgver.LessThan(*entry.Version) && !pkgver.Equal(*entry.Version)
+		case ">=":
+			match = !pkgver.LessThan(*entry.Version)
+		}
+		if match {
+			return entry.License == spdx, true
+		}
+	}
+
+	return false, false
+}