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sumdb_client_ops.go
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sumdb_client_ops.go
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package goproxy
import (
"bytes"
"context"
"errors"
"fmt"
"log"
"net/http"
"net/url"
"strings"
"sync"
)
// sumdbClientOps implements the `sumdb.ClientOps`.
type sumdbClientOps struct {
loadOnce sync.Once
loadError error
key []byte
endpointURL *url.URL
envGOPROXY string
envGOSUMDB string
httpClient *http.Client
errorLogger *log.Logger
}
// load loads the stuff of the sco up.
func (sco *sumdbClientOps) load() {
sumdbParts := strings.Fields(sco.envGOSUMDB)
if l := len(sumdbParts); l == 0 {
sco.loadError = errors.New("missing GOSUMDB")
return
} else if l > 2 {
sco.loadError = errors.New("invalid GOSUMDB: too many fields")
return
}
if sumdbParts[0] == "sum.golang.google.cn" {
sumdbParts[0] = "sum.golang.org"
if len(sumdbParts) == 1 {
sumdbParts = append(
sumdbParts,
"https://sum.golang.google.cn",
)
}
}
if sumdbParts[0] == "sum.golang.org" {
sumdbParts[0] = "sum.golang.org" +
"+033de0ae+Ac4zctda0e5eza+HJyk9SxEdh+s3Ux18htTTAD8OuAn8"
}
sco.key = []byte(sumdbParts[0])
sumdbName := sumdbParts[0]
if i := strings.Index(sumdbName, "+"); i >= 0 {
sumdbName = sumdbName[:i]
}
if len(sumdbParts) == 1 {
sumdbParts = append(sumdbParts, sumdbName)
}
sco.endpointURL, sco.loadError = parseRawURL(sumdbParts[1])
if sco.loadError != nil {
return
}
var proxyError error
for goproxy := sco.envGOPROXY; goproxy != ""; {
var (
proxy string
fallBackOnError bool
)
if i := strings.IndexAny(goproxy, ",|"); i >= 0 {
proxy = goproxy[:i]
fallBackOnError = goproxy[i] == '|'
goproxy = goproxy[i+1:]
} else {
proxy = goproxy
goproxy = ""
}
if proxy == "direct" || proxy == "off" {
proxyError = nil
break
}
proxyURL, err := parseRawURL(proxy)
if err != nil {
if fallBackOnError {
proxyError = err
continue
}
sco.loadError = err
return
}
endpointURL := appendURL(proxyURL, "sumdb", sumdbName)
if err := httpGet(
context.Background(),
sco.httpClient,
appendURL(endpointURL, "/supported").String(),
nil,
); err != nil {
if fallBackOnError || errors.Is(err, errNotFound) {
proxyError = err
continue
}
sco.loadError = err
return
}
sco.endpointURL = endpointURL
proxyError = nil
break
}
if proxyError != nil && !errors.Is(proxyError, errNotFound) {
sco.loadError = proxyError
}
}
// ReadRemote implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) ReadRemote(path string) ([]byte, error) {
if sco.loadOnce.Do(sco.load); sco.loadError != nil {
return nil, sco.loadError
}
var buf bytes.Buffer
if err := httpGet(
context.Background(),
sco.httpClient,
appendURL(sco.endpointURL, path).String(),
&buf,
); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// ReadConfig implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) ReadConfig(file string) ([]byte, error) {
if sco.loadOnce.Do(sco.load); sco.loadError != nil {
return nil, sco.loadError
}
if file == "key" {
return sco.key, nil
} else if strings.HasSuffix(file, "/latest") {
return []byte{}, nil // Empty result means empty tree
}
return nil, fmt.Errorf("unknown config %s", file)
}
// WriteConfig implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) WriteConfig(file string, old, new []byte) error {
sco.loadOnce.Do(sco.load)
return sco.loadError
}
// ReadCache implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) ReadCache(file string) ([]byte, error) {
if sco.loadOnce.Do(sco.load); sco.loadError != nil {
return nil, sco.loadError
}
return nil, ErrCacheNotFound
}
// WriteCache implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) WriteCache(file string, data []byte) {
sco.loadOnce.Do(sco.load)
}
// Log implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) Log(msg string) {
sco.loadOnce.Do(sco.load)
}
// SecurityError implements the `sumdb.ClientOps`.
func (sco *sumdbClientOps) SecurityError(msg string) {
sco.loadOnce.Do(sco.load)
if sco.errorLogger != nil {
sco.errorLogger.Print(msg)
} else {
log.Print(msg)
}
}