mirror of https://github.com/goproxyio/goproxy
init
kun
parent
3f2adc0b09
commit
68c0e15704
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@ -0,0 +1,76 @@
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package main
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import (
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"bytes"
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"fmt"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/goproxyio/goproxy/module"
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)
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var cacheDir string
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func main() {
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gp := os.Getenv("GOPATH")
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if gp == "" {
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panic("can not find $GOPATH")
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}
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cacheDir = filepath.Join(gp, "pkg", "mod", "cache", "download")
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http.Handle("/", mainHandler(http.FileServer(http.Dir(cacheDir))))
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err := http.ListenAndServe(":8081", nil)
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if nil != err {
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panic(err)
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}
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}
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func mainHandler(inner http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if _, err := os.Stat(filepath.Join(cacheDir, r.URL.Path)); err != nil {
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if strings.HasSuffix(r.URL.Path, ".info") {
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mod := strings.Split(r.URL.Path, "/@v/")
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if len(mod) != 2 {
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ReturnServerError(w, fmt.Errorf("bad module path:%s", r.URL.Path))
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return
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}
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version := strings.TrimSuffix(mod[1], ".info")
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version, err = module.DecodeVersion(version)
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if err != nil {
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ReturnServerError(w, err)
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return
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}
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path := strings.TrimPrefix(mod[0], "/")
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path, err := module.DecodePath(path)
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if err != nil {
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ReturnServerError(w, err)
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return
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}
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stdout, stderr, err := goGet(path + "@" + version)
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if err != nil {
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ReturnServerError(w, fmt.Errorf("stdout: %s stderr: %s", stdout, stderr))
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return
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}
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}
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if strings.HasSuffix(r.URL.Path, "/@v/list") {
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w.WriteHeader(200)
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w.Write([]byte(""))
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return
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}
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}
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inner.ServeHTTP(w, r)
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})
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}
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func goGet(path string) (string, string, error) {
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fmt.Fprintf(os.Stdout, "goproxy: download %s\n", path)
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cmd := exec.Command("go", "get", "-d", path)
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var stdout bytes.Buffer
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var stderr bytes.Buffer
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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err := cmd.Run()
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return string(stdout.Bytes()), string(stderr.Bytes()), err
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}
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@ -0,0 +1,540 @@
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package module defines the module.Version type
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// along with support code.
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package module
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// IMPORTANT NOTE
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//
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// This file essentially defines the set of valid import paths for the go command.
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// There are many subtle considerations, including Unicode ambiguity,
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// security, network, and file system representations.
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//
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// This file also defines the set of valid module path and version combinations,
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// another topic with many subtle considerations.
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//
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// Changes to the semantics in this file require approval from rsc.
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import (
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"fmt"
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"sort"
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"strings"
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"unicode"
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"unicode/utf8"
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"github.com/goproxyio/goproxy/semver"
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)
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// A Version is defined by a module path and version pair.
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type Version struct {
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Path string
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// Version is usually a semantic version in canonical form.
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// There are two exceptions to this general rule.
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// First, the top-level target of a build has no specific version
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// and uses Version = "".
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// Second, during MVS calculations the version "none" is used
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// to represent the decision to take no version of a given module.
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Version string `json:",omitempty"`
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}
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// Check checks that a given module path, version pair is valid.
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// In addition to the path being a valid module path
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// and the version being a valid semantic version,
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// the two must correspond.
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// For example, the path "yaml/v2" only corresponds to
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// semantic versions beginning with "v2.".
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func Check(path, version string) error {
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if err := CheckPath(path); err != nil {
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return err
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}
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if !semver.IsValid(version) {
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return fmt.Errorf("malformed semantic version %v", version)
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}
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_, pathMajor, _ := SplitPathVersion(path)
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if !MatchPathMajor(version, pathMajor) {
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if pathMajor == "" {
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pathMajor = "v0 or v1"
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}
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if pathMajor[0] == '.' { // .v1
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pathMajor = pathMajor[1:]
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}
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return fmt.Errorf("mismatched module path %v and version %v (want %v)", path, version, pathMajor)
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}
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return nil
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}
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// firstPathOK reports whether r can appear in the first element of a module path.
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// The first element of the path must be an LDH domain name, at least for now.
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// To avoid case ambiguity, the domain name must be entirely lower case.
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func firstPathOK(r rune) bool {
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return r == '-' || r == '.' ||
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'0' <= r && r <= '9' ||
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'a' <= r && r <= 'z'
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}
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// pathOK reports whether r can appear in an import path element.
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// Paths can be ASCII letters, ASCII digits, and limited ASCII punctuation: + - . _ and ~.
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// This matches what "go get" has historically recognized in import paths.
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// TODO(rsc): We would like to allow Unicode letters, but that requires additional
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// care in the safe encoding (see note below).
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func pathOK(r rune) bool {
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if r < utf8.RuneSelf {
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return r == '+' || r == '-' || r == '.' || r == '_' || r == '~' ||
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'0' <= r && r <= '9' ||
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'A' <= r && r <= 'Z' ||
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'a' <= r && r <= 'z'
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}
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return false
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}
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// fileNameOK reports whether r can appear in a file name.
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// For now we allow all Unicode letters but otherwise limit to pathOK plus a few more punctuation characters.
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// If we expand the set of allowed characters here, we have to
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// work harder at detecting potential case-folding and normalization collisions.
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// See note about "safe encoding" below.
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func fileNameOK(r rune) bool {
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if r < utf8.RuneSelf {
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// Entire set of ASCII punctuation, from which we remove characters:
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// ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~
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// We disallow some shell special characters: " ' * < > ? ` |
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// (Note that some of those are disallowed by the Windows file system as well.)
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// We also disallow path separators / : and \ (fileNameOK is only called on path element characters).
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// We allow spaces (U+0020) in file names.
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const allowed = "!#$%&()+,-.=@[]^_{}~ "
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if '0' <= r && r <= '9' || 'A' <= r && r <= 'Z' || 'a' <= r && r <= 'z' {
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return true
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}
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for i := 0; i < len(allowed); i++ {
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if rune(allowed[i]) == r {
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return true
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}
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}
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return false
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}
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// It may be OK to add more ASCII punctuation here, but only carefully.
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// For example Windows disallows < > \, and macOS disallows :, so we must not allow those.
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return unicode.IsLetter(r)
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}
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// CheckPath checks that a module path is valid.
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func CheckPath(path string) error {
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if err := checkPath(path, false); err != nil {
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return fmt.Errorf("malformed module path %q: %v", path, err)
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}
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i := strings.Index(path, "/")
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if i < 0 {
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i = len(path)
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}
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if i == 0 {
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return fmt.Errorf("malformed module path %q: leading slash", path)
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}
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if !strings.Contains(path[:i], ".") {
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return fmt.Errorf("malformed module path %q: missing dot in first path element", path)
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}
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if path[0] == '-' {
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return fmt.Errorf("malformed module path %q: leading dash in first path element", path)
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}
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for _, r := range path[:i] {
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if !firstPathOK(r) {
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return fmt.Errorf("malformed module path %q: invalid char %q in first path element", path, r)
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}
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}
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if _, _, ok := SplitPathVersion(path); !ok {
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return fmt.Errorf("malformed module path %q: invalid version", path)
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}
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return nil
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}
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// CheckImportPath checks that an import path is valid.
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func CheckImportPath(path string) error {
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if err := checkPath(path, false); err != nil {
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return fmt.Errorf("malformed import path %q: %v", path, err)
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}
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return nil
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}
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// checkPath checks that a general path is valid.
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// It returns an error describing why but not mentioning path.
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// Because these checks apply to both module paths and import paths,
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// the caller is expected to add the "malformed ___ path %q: " prefix.
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// fileName indicates whether the final element of the path is a file name
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// (as opposed to a directory name).
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func checkPath(path string, fileName bool) error {
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if !utf8.ValidString(path) {
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return fmt.Errorf("invalid UTF-8")
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}
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if path == "" {
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return fmt.Errorf("empty string")
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}
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if strings.Contains(path, "..") {
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return fmt.Errorf("double dot")
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}
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if strings.Contains(path, "//") {
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return fmt.Errorf("double slash")
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}
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if path[len(path)-1] == '/' {
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return fmt.Errorf("trailing slash")
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}
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elemStart := 0
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for i, r := range path {
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if r == '/' {
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if err := checkElem(path[elemStart:i], fileName); err != nil {
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return err
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}
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elemStart = i + 1
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}
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}
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if err := checkElem(path[elemStart:], fileName); err != nil {
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return err
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}
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return nil
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}
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// checkElem checks whether an individual path element is valid.
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// fileName indicates whether the element is a file name (not a directory name).
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func checkElem(elem string, fileName bool) error {
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if elem == "" {
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return fmt.Errorf("empty path element")
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}
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if strings.Count(elem, ".") == len(elem) {
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return fmt.Errorf("invalid path element %q", elem)
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}
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if elem[0] == '.' && !fileName {
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return fmt.Errorf("leading dot in path element")
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}
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if elem[len(elem)-1] == '.' {
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return fmt.Errorf("trailing dot in path element")
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}
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charOK := pathOK
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if fileName {
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charOK = fileNameOK
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}
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for _, r := range elem {
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if !charOK(r) {
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return fmt.Errorf("invalid char %q", r)
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}
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}
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// Windows disallows a bunch of path elements, sadly.
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// See https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
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short := elem
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if i := strings.Index(short, "."); i >= 0 {
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short = short[:i]
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}
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for _, bad := range badWindowsNames {
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if strings.EqualFold(bad, short) {
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return fmt.Errorf("disallowed path element %q", elem)
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}
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}
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return nil
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}
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// CheckFilePath checks whether a slash-separated file path is valid.
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func CheckFilePath(path string) error {
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if err := checkPath(path, true); err != nil {
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return fmt.Errorf("malformed file path %q: %v", path, err)
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}
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return nil
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}
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// badWindowsNames are the reserved file path elements on Windows.
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// See https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
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var badWindowsNames = []string{
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"CON",
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"PRN",
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"AUX",
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"NUL",
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"COM1",
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"COM2",
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"COM3",
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"COM4",
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"COM5",
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"COM6",
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"COM7",
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"COM8",
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"COM9",
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"LPT1",
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"LPT2",
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"LPT3",
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"LPT4",
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"LPT5",
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"LPT6",
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"LPT7",
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"LPT8",
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"LPT9",
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}
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// SplitPathVersion returns prefix and major version such that prefix+pathMajor == path
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// and version is either empty or "/vN" for N >= 2.
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// As a special case, gopkg.in paths are recognized directly;
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// they require ".vN" instead of "/vN", and for all N, not just N >= 2.
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func SplitPathVersion(path string) (prefix, pathMajor string, ok bool) {
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if strings.HasPrefix(path, "gopkg.in/") {
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return splitGopkgIn(path)
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}
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i := len(path)
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dot := false
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for i > 0 && ('0' <= path[i-1] && path[i-1] <= '9' || path[i-1] == '.') {
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if path[i-1] == '.' {
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dot = true
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}
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i--
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}
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if i <= 1 || path[i-1] != 'v' || path[i-2] != '/' {
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return path, "", true
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}
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prefix, pathMajor = path[:i-2], path[i-2:]
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if dot || len(pathMajor) <= 2 || pathMajor[2] == '0' || pathMajor == "/v1" {
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return path, "", false
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}
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return prefix, pathMajor, true
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}
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// splitGopkgIn is like SplitPathVersion but only for gopkg.in paths.
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func splitGopkgIn(path string) (prefix, pathMajor string, ok bool) {
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if !strings.HasPrefix(path, "gopkg.in/") {
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return path, "", false
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}
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i := len(path)
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if strings.HasSuffix(path, "-unstable") {
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i -= len("-unstable")
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}
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for i > 0 && ('0' <= path[i-1] && path[i-1] <= '9') {
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i--
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}
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if i <= 1 || path[i-1] != 'v' || path[i-2] != '.' {
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// All gopkg.in paths must end in vN for some N.
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return path, "", false
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}
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prefix, pathMajor = path[:i-2], path[i-2:]
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if len(pathMajor) <= 2 || pathMajor[2] == '0' && pathMajor != ".v0" {
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return path, "", false
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}
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return prefix, pathMajor, true
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}
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// MatchPathMajor reports whether the semantic version v
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// matches the path major version pathMajor.
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func MatchPathMajor(v, pathMajor string) bool {
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if strings.HasPrefix(pathMajor, ".v") && strings.HasSuffix(pathMajor, "-unstable") {
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pathMajor = strings.TrimSuffix(pathMajor, "-unstable")
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}
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if strings.HasPrefix(v, "v0.0.0-") && pathMajor == ".v1" {
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// Allow old bug in pseudo-versions that generated v0.0.0- pseudoversion for gopkg .v1.
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// For example, gopkg.in/yaml.v2@v2.2.1's go.mod requires gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405.
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return true
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}
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m := semver.Major(v)
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if pathMajor == "" {
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return m == "v0" || m == "v1" || semver.Build(v) == "+incompatible"
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}
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return (pathMajor[0] == '/' || pathMajor[0] == '.') && m == pathMajor[1:]
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}
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// CanonicalVersion returns the canonical form of the version string v.
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// It is the same as semver.Canonical(v) except that it preserves the special build suffix "+incompatible".
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func CanonicalVersion(v string) string {
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cv := semver.Canonical(v)
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if semver.Build(v) == "+incompatible" {
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cv += "+incompatible"
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}
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return cv
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}
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// Sort sorts the list by Path, breaking ties by comparing Versions.
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func Sort(list []Version) {
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sort.Slice(list, func(i, j int) bool {
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mi := list[i]
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mj := list[j]
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if mi.Path != mj.Path {
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return mi.Path < mj.Path
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}
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// To help go.sum formatting, allow version/file.
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// Compare semver prefix by semver rules,
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// file by string order.
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vi := mi.Version
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vj := mj.Version
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var fi, fj string
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if k := strings.Index(vi, "/"); k >= 0 {
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vi, fi = vi[:k], vi[k:]
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}
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if k := strings.Index(vj, "/"); k >= 0 {
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vj, fj = vj[:k], vj[k:]
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}
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if vi != vj {
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return semver.Compare(vi, vj) < 0
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}
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return fi < fj
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})
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}
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|
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// Safe encodings
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//
|
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// Module paths appear as substrings of file system paths
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||||
// (in the download cache) and of web server URLs in the proxy protocol.
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// In general we cannot rely on file systems to be case-sensitive,
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// nor can we rely on web servers, since they read from file systems.
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// That is, we cannot rely on the file system to keep rsc.io/QUOTE
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// and rsc.io/quote separate. Windows and macOS don't.
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// Instead, we must never require two different casings of a file path.
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// Because we want the download cache to match the proxy protocol,
|
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// and because we want the proxy protocol to be possible to serve
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// from a tree of static files (which might be stored on a case-insensitive
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// file system), the proxy protocol must never require two different casings
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// of a URL path either.
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//
|
||||
// One possibility would be to make the safe encoding be the lowercase
|
||||
// hexadecimal encoding of the actual path bytes. This would avoid ever
|
||||
// needing different casings of a file path, but it would be fairly illegible
|
||||
// to most programmers when those paths appeared in the file system
|
||||
// (including in file paths in compiler errors and stack traces)
|
||||
// in web server logs, and so on. Instead, we want a safe encoding that
|
||||
// leaves most paths unaltered.
|
||||
//
|
||||
// The safe encoding is this:
|
||||
// replace every uppercase letter with an exclamation mark
|
||||
// followed by the letter's lowercase equivalent.
|
||||
//
|
||||
// For example,
|
||||
// github.com/Azure/azure-sdk-for-go -> github.com/!azure/azure-sdk-for-go.
|
||||
// github.com/GoogleCloudPlatform/cloudsql-proxy -> github.com/!google!cloud!platform/cloudsql-proxy
|
||||
// github.com/Sirupsen/logrus -> github.com/!sirupsen/logrus.
|
||||
//
|
||||
// Import paths that avoid upper-case letters are left unchanged.
|
||||
// Note that because import paths are ASCII-only and avoid various
|
||||
// problematic punctuation (like : < and >), the safe encoding is also ASCII-only
|
||||
// and avoids the same problematic punctuation.
|
||||
//
|
||||
// Import paths have never allowed exclamation marks, so there is no
|
||||
// need to define how to encode a literal !.
|
||||
//
|
||||
// Although paths are disallowed from using Unicode (see pathOK above),
|
||||
// the eventual plan is to allow Unicode letters as well, to assume that
|
||||
// file systems and URLs are Unicode-safe (storing UTF-8), and apply
|
||||
// the !-for-uppercase convention. Note however that not all runes that
|
||||
// are different but case-fold equivalent are an upper/lower pair.
|
||||
// For example, U+004B ('K'), U+006B ('k'), and U+212A ('K' for Kelvin)
|
||||
// are considered to case-fold to each other. When we do add Unicode
|
||||
// letters, we must not assume that upper/lower are the only case-equivalent pairs.
|
||||
// Perhaps the Kelvin symbol would be disallowed entirely, for example.
|
||||
// Or perhaps it would encode as "!!k", or perhaps as "(212A)".
|
||||
//
|
||||
// Also, it would be nice to allow Unicode marks as well as letters,
|
||||
// but marks include combining marks, and then we must deal not
|
||||
// only with case folding but also normalization: both U+00E9 ('é')
|
||||
// and U+0065 U+0301 ('e' followed by combining acute accent)
|
||||
// look the same on the page and are treated by some file systems
|
||||
// as the same path. If we do allow Unicode marks in paths, there
|
||||
// must be some kind of normalization to allow only one canonical
|
||||
// encoding of any character used in an import path.
|
||||
|
||||
// EncodePath returns the safe encoding of the given module path.
|
||||
// It fails if the module path is invalid.
|
||||
func EncodePath(path string) (encoding string, err error) {
|
||||
if err := CheckPath(path); err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return encodeString(path)
|
||||
}
|
||||
|
||||
// EncodeVersion returns the safe encoding of the given module version.
|
||||
// Versions are allowed to be in non-semver form but must be valid file names
|
||||
// and not contain exclamation marks.
|
||||
func EncodeVersion(v string) (encoding string, err error) {
|
||||
if err := checkElem(v, true); err != nil || strings.Contains(v, "!") {
|
||||
return "", fmt.Errorf("disallowed version string %q", v)
|
||||
}
|
||||
return encodeString(v)
|
||||
}
|
||||
|
||||
func encodeString(s string) (encoding string, err error) {
|
||||
haveUpper := false
|
||||
for _, r := range s {
|
||||
if r == '!' || r >= utf8.RuneSelf {
|
||||
// This should be disallowed by CheckPath, but diagnose anyway.
|
||||
// The correctness of the encoding loop below depends on it.
|
||||
return "", fmt.Errorf("internal error: inconsistency in EncodePath")
|
||||
}
|
||||
if 'A' <= r && r <= 'Z' {
|
||||
haveUpper = true
|
||||
}
|
||||
}
|
||||
|
||||
if !haveUpper {
|
||||
return s, nil
|
||||
}
|
||||
|
||||
var buf []byte
|
||||
for _, r := range s {
|
||||
if 'A' <= r && r <= 'Z' {
|
||||
buf = append(buf, '!', byte(r+'a'-'A'))
|
||||
} else {
|
||||
buf = append(buf, byte(r))
|
||||
}
|
||||
}
|
||||
return string(buf), nil
|
||||
}
|
||||
|
||||
// DecodePath returns the module path of the given safe encoding.
|
||||
// It fails if the encoding is invalid or encodes an invalid path.
|
||||
func DecodePath(encoding string) (path string, err error) {
|
||||
path, ok := decodeString(encoding)
|
||||
if !ok {
|
||||
return "", fmt.Errorf("invalid module path encoding %q", encoding)
|
||||
}
|
||||
if err := CheckPath(path); err != nil {
|
||||
return "", fmt.Errorf("invalid module path encoding %q: %v", encoding, err)
|
||||
}
|
||||
return path, nil
|
||||
}
|
||||
|
||||
// DecodeVersion returns the version string for the given safe encoding.
|
||||
// It fails if the encoding is invalid or encodes an invalid version.
|
||||
// Versions are allowed to be in non-semver form but must be valid file names
|
||||
// and not contain exclamation marks.
|
||||
func DecodeVersion(encoding string) (v string, err error) {
|
||||
v, ok := decodeString(encoding)
|
||||
if !ok {
|
||||
return "", fmt.Errorf("invalid version encoding %q", encoding)
|
||||
}
|
||||
if err := checkElem(v, true); err != nil {
|
||||
return "", fmt.Errorf("disallowed version string %q", v)
|
||||
}
|
||||
return v, nil
|
||||
}
|
||||
|
||||
func decodeString(encoding string) (string, bool) {
|
||||
var buf []byte
|
||||
|
||||
bang := false
|
||||
for _, r := range encoding {
|
||||
if r >= utf8.RuneSelf {
|
||||
return "", false
|
||||
}
|
||||
if bang {
|
||||
bang = false
|
||||
if r < 'a' || 'z' < r {
|
||||
return "", false
|
||||
}
|
||||
buf = append(buf, byte(r+'A'-'a'))
|
||||
continue
|
||||
}
|
||||
if r == '!' {
|
||||
bang = true
|
||||
continue
|
||||
}
|
||||
if 'A' <= r && r <= 'Z' {
|
||||
return "", false
|
||||
}
|
||||
buf = append(buf, byte(r))
|
||||
}
|
||||
if bang {
|
||||
return "", false
|
||||
}
|
||||
return string(buf), true
|
||||
}
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net/http"
|
||||
"os"
|
||||
)
|
||||
|
||||
func ReturnServerError(w http.ResponseWriter, err error) {
|
||||
w.WriteHeader(500)
|
||||
msg := fmt.Sprintf("%v", err)
|
||||
w.Write([]byte(msg))
|
||||
fmt.Fprintf(os.Stderr, "goproxy: %v\n", err)
|
||||
}
|
||||
|
|
@ -0,0 +1,388 @@
|
|||
// Copyright 2018 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package semver implements comparison of semantic version strings.
|
||||
// In this package, semantic version strings must begin with a leading "v",
|
||||
// as in "v1.0.0".
|
||||
//
|
||||
// The general form of a semantic version string accepted by this package is
|
||||
//
|
||||
// vMAJOR[.MINOR[.PATCH[-PRERELEASE][+BUILD]]]
|
||||
//
|
||||
// where square brackets indicate optional parts of the syntax;
|
||||
// MAJOR, MINOR, and PATCH are decimal integers without extra leading zeros;
|
||||
// PRERELEASE and BUILD are each a series of non-empty dot-separated identifiers
|
||||
// using only alphanumeric characters and hyphens; and
|
||||
// all-numeric PRERELEASE identifiers must not have leading zeros.
|
||||
//
|
||||
// This package follows Semantic Versioning 2.0.0 (see semver.org)
|
||||
// with two exceptions. First, it requires the "v" prefix. Second, it recognizes
|
||||
// vMAJOR and vMAJOR.MINOR (with no prerelease or build suffixes)
|
||||
// as shorthands for vMAJOR.0.0 and vMAJOR.MINOR.0.
|
||||
package semver
|
||||
|
||||
// parsed returns the parsed form of a semantic version string.
|
||||
type parsed struct {
|
||||
major string
|
||||
minor string
|
||||
patch string
|
||||
short string
|
||||
prerelease string
|
||||
build string
|
||||
err string
|
||||
}
|
||||
|
||||
// IsValid reports whether v is a valid semantic version string.
|
||||
func IsValid(v string) bool {
|
||||
_, ok := parse(v)
|
||||
return ok
|
||||
}
|
||||
|
||||
// Canonical returns the canonical formatting of the semantic version v.
|
||||
// It fills in any missing .MINOR or .PATCH and discards build metadata.
|
||||
// Two semantic versions compare equal only if their canonical formattings
|
||||
// are identical strings.
|
||||
// The canonical invalid semantic version is the empty string.
|
||||
func Canonical(v string) string {
|
||||
p, ok := parse(v)
|
||||
if !ok {
|
||||
return ""
|
||||
}
|
||||
if p.build != "" {
|
||||
return v[:len(v)-len(p.build)]
|
||||
}
|
||||
if p.short != "" {
|
||||
return v + p.short
|
||||
}
|
||||
return v
|
||||
}
|
||||
|
||||
// Major returns the major version prefix of the semantic version v.
|
||||
// For example, Major("v2.1.0") == "v2".
|
||||
// If v is an invalid semantic version string, Major returns the empty string.
|
||||
func Major(v string) string {
|
||||
pv, ok := parse(v)
|
||||
if !ok {
|
||||
return ""
|
||||
}
|
||||
return v[:1+len(pv.major)]
|
||||
}
|
||||
|
||||
// MajorMinor returns the major.minor version prefix of the semantic version v.
|
||||
// For example, MajorMinor("v2.1.0") == "v2.1".
|
||||
// If v is an invalid semantic version string, MajorMinor returns the empty string.
|
||||
func MajorMinor(v string) string {
|
||||
pv, ok := parse(v)
|
||||
if !ok {
|
||||
return ""
|
||||
}
|
||||
i := 1 + len(pv.major)
|
||||
if j := i + 1 + len(pv.minor); j <= len(v) && v[i] == '.' && v[i+1:j] == pv.minor {
|
||||
return v[:j]
|
||||
}
|
||||
return v[:i] + "." + pv.minor
|
||||
}
|
||||
|
||||
// Prerelease returns the prerelease suffix of the semantic version v.
|
||||
// For example, Prerelease("v2.1.0-pre+meta") == "-pre".
|
||||
// If v is an invalid semantic version string, Prerelease returns the empty string.
|
||||
func Prerelease(v string) string {
|
||||
pv, ok := parse(v)
|
||||
if !ok {
|
||||
return ""
|
||||
}
|
||||
return pv.prerelease
|
||||
}
|
||||
|
||||
// Build returns the build suffix of the semantic version v.
|
||||
// For example, Build("v2.1.0+meta") == "+meta".
|
||||
// If v is an invalid semantic version string, Build returns the empty string.
|
||||
func Build(v string) string {
|
||||
pv, ok := parse(v)
|
||||
if !ok {
|
||||
return ""
|
||||
}
|
||||
return pv.build
|
||||
}
|
||||
|
||||
// Compare returns an integer comparing two versions according to
|
||||
// according to semantic version precedence.
|
||||
// The result will be 0 if v == w, -1 if v < w, or +1 if v > w.
|
||||
//
|
||||
// An invalid semantic version string is considered less than a valid one.
|
||||
// All invalid semantic version strings compare equal to each other.
|
||||
func Compare(v, w string) int {
|
||||
pv, ok1 := parse(v)
|
||||
pw, ok2 := parse(w)
|
||||
if !ok1 && !ok2 {
|
||||
return 0
|
||||
}
|
||||
if !ok1 {
|
||||
return -1
|
||||
}
|
||||
if !ok2 {
|
||||
return +1
|
||||
}
|
||||
if c := compareInt(pv.major, pw.major); c != 0 {
|
||||
return c
|
||||
}
|
||||
if c := compareInt(pv.minor, pw.minor); c != 0 {
|
||||
return c
|
||||
}
|
||||
if c := compareInt(pv.patch, pw.patch); c != 0 {
|
||||
return c
|
||||
}
|
||||
return comparePrerelease(pv.prerelease, pw.prerelease)
|
||||
}
|
||||
|
||||
// Max canonicalizes its arguments and then returns the version string
|
||||
// that compares greater.
|
||||
func Max(v, w string) string {
|
||||
v = Canonical(v)
|
||||
w = Canonical(w)
|
||||
if Compare(v, w) > 0 {
|
||||
return v
|
||||
}
|
||||
return w
|
||||
}
|
||||
|
||||
func parse(v string) (p parsed, ok bool) {
|
||||
if v == "" || v[0] != 'v' {
|
||||
p.err = "missing v prefix"
|
||||
return
|
||||
}
|
||||
p.major, v, ok = parseInt(v[1:])
|
||||
if !ok {
|
||||
p.err = "bad major version"
|
||||
return
|
||||
}
|
||||
if v == "" {
|
||||
p.minor = "0"
|
||||
p.patch = "0"
|
||||
p.short = ".0.0"
|
||||
return
|
||||
}
|
||||
if v[0] != '.' {
|
||||
p.err = "bad minor prefix"
|
||||
ok = false
|
||||
return
|
||||
}
|
||||
p.minor, v, ok = parseInt(v[1:])
|
||||
if !ok {
|
||||
p.err = "bad minor version"
|
||||
return
|
||||
}
|
||||
if v == "" {
|
||||
p.patch = "0"
|
||||
p.short = ".0"
|
||||
return
|
||||
}
|
||||
if v[0] != '.' {
|
||||
p.err = "bad patch prefix"
|
||||
ok = false
|
||||
return
|
||||
}
|
||||
p.patch, v, ok = parseInt(v[1:])
|
||||
if !ok {
|
||||
p.err = "bad patch version"
|
||||
return
|
||||
}
|
||||
if len(v) > 0 && v[0] == '-' {
|
||||
p.prerelease, v, ok = parsePrerelease(v)
|
||||
if !ok {
|
||||
p.err = "bad prerelease"
|
||||
return
|
||||
}
|
||||
}
|
||||
if len(v) > 0 && v[0] == '+' {
|
||||
p.build, v, ok = parseBuild(v)
|
||||
if !ok {
|
||||
p.err = "bad build"
|
||||
return
|
||||
}
|
||||
}
|
||||
if v != "" {
|
||||
p.err = "junk on end"
|
||||
ok = false
|
||||
return
|
||||
}
|
||||
ok = true
|
||||
return
|
||||
}
|
||||
|
||||
func parseInt(v string) (t, rest string, ok bool) {
|
||||
if v == "" {
|
||||
return
|
||||
}
|
||||
if v[0] < '0' || '9' < v[0] {
|
||||
return
|
||||
}
|
||||
i := 1
|
||||
for i < len(v) && '0' <= v[i] && v[i] <= '9' {
|
||||
i++
|
||||
}
|
||||
if v[0] == '0' && i != 1 {
|
||||
return
|
||||
}
|
||||
return v[:i], v[i:], true
|
||||
}
|
||||
|
||||
func parsePrerelease(v string) (t, rest string, ok bool) {
|
||||
// "A pre-release version MAY be denoted by appending a hyphen and
|
||||
// a series of dot separated identifiers immediately following the patch version.
|
||||
// Identifiers MUST comprise only ASCII alphanumerics and hyphen [0-9A-Za-z-].
|
||||
// Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes."
|
||||
if v == "" || v[0] != '-' {
|
||||
return
|
||||
}
|
||||
i := 1
|
||||
start := 1
|
||||
for i < len(v) && v[i] != '+' {
|
||||
if !isIdentChar(v[i]) && v[i] != '.' {
|
||||
return
|
||||
}
|
||||
if v[i] == '.' {
|
||||
if start == i || isBadNum(v[start:i]) {
|
||||
return
|
||||
}
|
||||
start = i + 1
|
||||
}
|
||||
i++
|
||||
}
|
||||
if start == i || isBadNum(v[start:i]) {
|
||||
return
|
||||
}
|
||||
return v[:i], v[i:], true
|
||||
}
|
||||
|
||||
func parseBuild(v string) (t, rest string, ok bool) {
|
||||
if v == "" || v[0] != '+' {
|
||||
return
|
||||
}
|
||||
i := 1
|
||||
start := 1
|
||||
for i < len(v) {
|
||||
if !isIdentChar(v[i]) {
|
||||
return
|
||||
}
|
||||
if v[i] == '.' {
|
||||
if start == i {
|
||||
return
|
||||
}
|
||||
start = i + 1
|
||||
}
|
||||
i++
|
||||
}
|
||||
if start == i {
|
||||
return
|
||||
}
|
||||
return v[:i], v[i:], true
|
||||
}
|
||||
|
||||
func isIdentChar(c byte) bool {
|
||||
return 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' || c == '-'
|
||||
}
|
||||
|
||||
func isBadNum(v string) bool {
|
||||
i := 0
|
||||
for i < len(v) && '0' <= v[i] && v[i] <= '9' {
|
||||
i++
|
||||
}
|
||||
return i == len(v) && i > 1 && v[0] == '0'
|
||||
}
|
||||
|
||||
func isNum(v string) bool {
|
||||
i := 0
|
||||
for i < len(v) && '0' <= v[i] && v[i] <= '9' {
|
||||
i++
|
||||
}
|
||||
return i == len(v)
|
||||
}
|
||||
|
||||
func compareInt(x, y string) int {
|
||||
if x == y {
|
||||
return 0
|
||||
}
|
||||
if len(x) < len(y) {
|
||||
return -1
|
||||
}
|
||||
if len(x) > len(y) {
|
||||
return +1
|
||||
}
|
||||
if x < y {
|
||||
return -1
|
||||
} else {
|
||||
return +1
|
||||
}
|
||||
}
|
||||
|
||||
func comparePrerelease(x, y string) int {
|
||||
// "When major, minor, and patch are equal, a pre-release version has
|
||||
// lower precedence than a normal version.
|
||||
// Example: 1.0.0-alpha < 1.0.0.
|
||||
// Precedence for two pre-release versions with the same major, minor,
|
||||
// and patch version MUST be determined by comparing each dot separated
|
||||
// identifier from left to right until a difference is found as follows:
|
||||
// identifiers consisting of only digits are compared numerically and
|
||||
// identifiers with letters or hyphens are compared lexically in ASCII
|
||||
// sort order. Numeric identifiers always have lower precedence than
|
||||
// non-numeric identifiers. A larger set of pre-release fields has a
|
||||
// higher precedence than a smaller set, if all of the preceding
|
||||
// identifiers are equal.
|
||||
// Example: 1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta <
|
||||
// 1.0.0-beta < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0."
|
||||
if x == y {
|
||||
return 0
|
||||
}
|
||||
if x == "" {
|
||||
return +1
|
||||
}
|
||||
if y == "" {
|
||||
return -1
|
||||
}
|
||||
for x != "" && y != "" {
|
||||
x = x[1:] // skip - or .
|
||||
y = y[1:] // skip - or .
|
||||
var dx, dy string
|
||||
dx, x = nextIdent(x)
|
||||
dy, y = nextIdent(y)
|
||||
if dx != dy {
|
||||
ix := isNum(dx)
|
||||
iy := isNum(dy)
|
||||
if ix != iy {
|
||||
if ix {
|
||||
return -1
|
||||
} else {
|
||||
return +1
|
||||
}
|
||||
}
|
||||
if ix {
|
||||
if len(dx) < len(dy) {
|
||||
return -1
|
||||
}
|
||||
if len(dx) > len(dy) {
|
||||
return +1
|
||||
}
|
||||
}
|
||||
if dx < dy {
|
||||
return -1
|
||||
} else {
|
||||
return +1
|
||||
}
|
||||
}
|
||||
}
|
||||
if x == "" {
|
||||
return -1
|
||||
} else {
|
||||
return +1
|
||||
}
|
||||
}
|
||||
|
||||
func nextIdent(x string) (dx, rest string) {
|
||||
i := 0
|
||||
for i < len(x) && x[i] != '.' {
|
||||
i++
|
||||
}
|
||||
return x[:i], x[i:]
|
||||
}
|
||||
Loading…
Reference in New Issue