зеркало из https://github.com/golang/tools.git
325 строки
11 KiB
Go
325 строки
11 KiB
Go
// Copyright 2013 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 redirect provides hooks to register HTTP handlers that redirect old
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// godoc paths to their new equivalents and assist in accessing the issue
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// tracker, wiki, code review system, etc.
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package redirect // import "golang.org/x/tools/godoc/redirect"
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import (
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"context"
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"fmt"
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"html/template"
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"net/http"
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"os"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"time"
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"golang.org/x/net/context/ctxhttp"
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)
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// Register registers HTTP handlers that redirect old godoc paths to their new
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// equivalents and assist in accessing the issue tracker, wiki, code review
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// system, etc. If mux is nil it uses http.DefaultServeMux.
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func Register(mux *http.ServeMux) {
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if mux == nil {
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mux = http.DefaultServeMux
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}
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handlePathRedirects(mux, pkgRedirects, "/pkg/")
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handlePathRedirects(mux, cmdRedirects, "/cmd/")
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for prefix, redirect := range prefixHelpers {
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p := "/" + prefix + "/"
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mux.Handle(p, PrefixHandler(p, redirect))
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}
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for path, redirect := range redirects {
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mux.Handle(path, Handler(redirect))
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}
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// NB: /src/pkg (sans trailing slash) is the index of packages.
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mux.HandleFunc("/src/pkg/", srcPkgHandler)
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mux.HandleFunc("/cl/", clHandler)
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mux.HandleFunc("/change/", changeHandler)
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mux.HandleFunc("/design/", designHandler)
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}
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func handlePathRedirects(mux *http.ServeMux, redirects map[string]string, prefix string) {
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for source, target := range redirects {
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h := Handler(prefix + target + "/")
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p := prefix + source
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mux.Handle(p, h)
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mux.Handle(p+"/", h)
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}
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}
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// Packages that were renamed between r60 and go1.
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var pkgRedirects = map[string]string{
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"asn1": "encoding/asn1",
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"big": "math/big",
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"cmath": "math/cmplx",
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"csv": "encoding/csv",
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"exec": "os/exec",
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"exp/template/html": "html/template",
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"gob": "encoding/gob",
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"http": "net/http",
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"http/cgi": "net/http/cgi",
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"http/fcgi": "net/http/fcgi",
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"http/httptest": "net/http/httptest",
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"http/pprof": "net/http/pprof",
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"json": "encoding/json",
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"mail": "net/mail",
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"rand": "math/rand",
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"rpc": "net/rpc",
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"rpc/jsonrpc": "net/rpc/jsonrpc",
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"scanner": "text/scanner",
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"smtp": "net/smtp",
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"tabwriter": "text/tabwriter",
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"template": "text/template",
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"template/parse": "text/template/parse",
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"url": "net/url",
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"utf16": "unicode/utf16",
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"utf8": "unicode/utf8",
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"xml": "encoding/xml",
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}
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// Commands that were renamed between r60 and go1.
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var cmdRedirects = map[string]string{
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"gofix": "fix",
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"goinstall": "go",
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"gopack": "pack",
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"gotest": "go",
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"govet": "vet",
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"goyacc": "yacc",
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}
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var redirects = map[string]string{
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"/blog": "/blog/",
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"/build": "http://build.golang.org",
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"/change": "https://go.googlesource.com/go",
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"/cl": "https://go-review.googlesource.com",
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"/cmd/godoc/": "http://godoc.org/golang.org/x/tools/cmd/godoc/",
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"/issue": "https://github.com/golang/go/issues",
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"/issue/new": "https://github.com/golang/go/issues/new",
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"/issues": "https://github.com/golang/go/issues",
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"/issues/new": "https://github.com/golang/go/issues/new",
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"/play": "http://play.golang.org",
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"/design": "https://go.googlesource.com/proposal/+/master/design",
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// In Go 1.2 the references page is part of /doc/.
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"/ref": "/doc/#references",
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// This next rule clobbers /ref/spec and /ref/mem.
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// TODO(adg): figure out what to do here, if anything.
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// "/ref/": "/doc/#references",
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// Be nice to people who are looking in the wrong place.
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"/doc/mem": "/ref/mem",
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"/doc/spec": "/ref/spec",
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"/talks": "http://talks.golang.org",
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"/tour": "http://tour.golang.org",
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"/wiki": "https://github.com/golang/go/wiki",
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"/doc/articles/c_go_cgo.html": "/blog/c-go-cgo",
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"/doc/articles/concurrency_patterns.html": "/blog/go-concurrency-patterns-timing-out-and",
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"/doc/articles/defer_panic_recover.html": "/blog/defer-panic-and-recover",
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"/doc/articles/error_handling.html": "/blog/error-handling-and-go",
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"/doc/articles/gobs_of_data.html": "/blog/gobs-of-data",
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"/doc/articles/godoc_documenting_go_code.html": "/blog/godoc-documenting-go-code",
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"/doc/articles/gos_declaration_syntax.html": "/blog/gos-declaration-syntax",
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"/doc/articles/image_draw.html": "/blog/go-imagedraw-package",
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"/doc/articles/image_package.html": "/blog/go-image-package",
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"/doc/articles/json_and_go.html": "/blog/json-and-go",
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"/doc/articles/json_rpc_tale_of_interfaces.html": "/blog/json-rpc-tale-of-interfaces",
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"/doc/articles/laws_of_reflection.html": "/blog/laws-of-reflection",
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"/doc/articles/slices_usage_and_internals.html": "/blog/go-slices-usage-and-internals",
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"/doc/go_for_cpp_programmers.html": "/wiki/GoForCPPProgrammers",
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"/doc/go_tutorial.html": "http://tour.golang.org/",
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}
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var prefixHelpers = map[string]string{
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"issue": "https://github.com/golang/go/issues/",
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"issues": "https://github.com/golang/go/issues/",
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"play": "http://play.golang.org/",
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"talks": "http://talks.golang.org/",
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"wiki": "https://github.com/golang/go/wiki/",
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}
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func Handler(target string) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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url := target
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if qs := r.URL.RawQuery; qs != "" {
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url += "?" + qs
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}
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http.Redirect(w, r, url, http.StatusMovedPermanently)
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})
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}
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var validID = regexp.MustCompile(`^[A-Za-z0-9-]*/?$`)
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func PrefixHandler(prefix, baseURL string) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if p := r.URL.Path; p == prefix {
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// redirect /prefix/ to /prefix
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http.Redirect(w, r, p[:len(p)-1], http.StatusFound)
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return
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}
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id := r.URL.Path[len(prefix):]
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if !validID.MatchString(id) {
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http.Error(w, "Not found", http.StatusNotFound)
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return
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}
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target := baseURL + id
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http.Redirect(w, r, target, http.StatusFound)
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})
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}
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// Redirect requests from the old "/src/pkg/foo" to the new "/src/foo".
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// See http://golang.org/s/go14nopkg
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func srcPkgHandler(w http.ResponseWriter, r *http.Request) {
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r.URL.Path = "/src/" + r.URL.Path[len("/src/pkg/"):]
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http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
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}
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func clHandler(w http.ResponseWriter, r *http.Request) {
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const prefix = "/cl/"
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if p := r.URL.Path; p == prefix {
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// redirect /prefix/ to /prefix
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http.Redirect(w, r, p[:len(p)-1], http.StatusFound)
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return
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}
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id := r.URL.Path[len(prefix):]
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// support /cl/152700045/, which is used in commit 0edafefc36.
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id = strings.TrimSuffix(id, "/")
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if !validID.MatchString(id) {
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http.Error(w, "Not found", http.StatusNotFound)
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return
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}
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target := ""
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if n, err := strconv.Atoi(id); err == nil && isRietveldCL(n) {
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// Issue 28836: if this Rietveld CL happens to
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// also be a Gerrit CL, render a disambiguation HTML
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// page with two links instead. We need to make a
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// Gerrit API call to figure that out, but we cache
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// known Gerrit CLs so it's done at most once per CL.
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if ok, err := isGerritCL(r.Context(), n); err == nil && ok {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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clDisambiguationHTML.Execute(w, n)
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return
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}
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target = "https://codereview.appspot.com/" + id
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} else {
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target = "https://go-review.googlesource.com/" + id
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}
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http.Redirect(w, r, target, http.StatusFound)
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}
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var clDisambiguationHTML = template.Must(template.New("").Parse(`<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Go CL {{.}} Disambiguation</title>
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<meta name="viewport" content="width=device-width">
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</head>
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<body>
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CL number {{.}} exists in both Gerrit (the current code review system)
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and Rietveld (the previous code review system). Please make a choice:
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<ul>
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<li><a href="https://go-review.googlesource.com/{{.}}">Gerrit CL {{.}}</a></li>
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<li><a href="https://codereview.appspot.com/{{.}}">Rietveld CL {{.}}</a></li>
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</ul>
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</body>
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</html>`))
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// isGerritCL reports whether a Gerrit CL with the specified numeric change ID (e.g., "4247")
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// is known to exist by querying the Gerrit API at https://go-review.googlesource.com.
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// isGerritCL uses gerritCLCache as a cache of Gerrit CL IDs that exist.
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func isGerritCL(ctx context.Context, id int) (bool, error) {
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// Check cache first.
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gerritCLCache.Lock()
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ok := gerritCLCache.exist[id]
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gerritCLCache.Unlock()
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if ok {
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return true, nil
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}
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// Query the Gerrit API Get Change endpoint, as documented at
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// https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#get-change.
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ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
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defer cancel()
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resp, err := ctxhttp.Get(ctx, nil, fmt.Sprintf("https://go-review.googlesource.com/changes/%d", id))
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if err != nil {
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return false, err
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}
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resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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// A Gerrit CL with this ID exists. Add it to cache.
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gerritCLCache.Lock()
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gerritCLCache.exist[id] = true
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gerritCLCache.Unlock()
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return true, nil
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case http.StatusNotFound:
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// A Gerrit CL with this ID doesn't exist. It may get created in the future.
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return false, nil
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default:
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return false, fmt.Errorf("unexpected status code: %v", resp.Status)
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}
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}
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var gerritCLCache = struct {
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sync.Mutex
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exist map[int]bool // exist is a set of Gerrit CL IDs that are known to exist.
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}{exist: make(map[int]bool)}
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var changeMap *hashMap
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// LoadChangeMap loads the specified map of Mercurial to Git revisions,
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// which is used by the /change/ handler to intelligently map old hg
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// revisions to their new git equivalents.
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// It should be called before calling Register.
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// The file should remain open as long as the process is running.
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// See the implementation of this package for details.
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func LoadChangeMap(filename string) error {
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f, err := os.Open(filename)
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if err != nil {
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return err
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}
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m, err := newHashMap(f)
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if err != nil {
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return err
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}
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changeMap = m
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return nil
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}
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func changeHandler(w http.ResponseWriter, r *http.Request) {
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const prefix = "/change/"
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if p := r.URL.Path; p == prefix {
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// redirect /prefix/ to /prefix
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http.Redirect(w, r, p[:len(p)-1], http.StatusFound)
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return
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}
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hash := r.URL.Path[len(prefix):]
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target := "https://go.googlesource.com/go/+/" + hash
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if git := changeMap.Lookup(hash); git > 0 {
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target = fmt.Sprintf("https://go.googlesource.com/%v/+/%v", git.Repo(), git.Hash())
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}
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http.Redirect(w, r, target, http.StatusFound)
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}
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func designHandler(w http.ResponseWriter, r *http.Request) {
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const prefix = "/design/"
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if p := r.URL.Path; p == prefix {
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// redirect /prefix/ to /prefix
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http.Redirect(w, r, p[:len(p)-1], http.StatusFound)
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return
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}
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name := r.URL.Path[len(prefix):]
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target := "https://go.googlesource.com/proposal/+/master/design/" + name + ".md"
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http.Redirect(w, r, target, http.StatusFound)
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}
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