go.mod, vendor: update (#3358)

* go.mod, vendor: remove unnecessary dependencies

Commands:
1. go mod tidy
2. go mod vendor

* go.mod, vendor: update cloud.google.com/go

Commands:
1. go get -u cloud.google.com/go
2. go mod tidy
3. go mod vendor

* go.mod, vendor: update cloud.google.com/*

Commands:
1. go get -u cloud.google.com/storage cloud.google.com/logging
2. go mod tidy
3. go mod vendor

* go.mod, .golangci.yml, vendor: update *lint*

Commands:
1. go get -u golang.org/x/tools github.com/golangci/golangci-lint@v1.47.0
2. go mod tidy
3. go mod vendor
4. edit .golangci.yml to suppress new errors (resolved in the same PR later)

* all: fix lint errors

hash.go: copy() recommended by gosimple
parse.go: ent is never nil
verifier.go: signal.Notify() with unbuffered channel is bad. Have no idea why.

* .golangci.yml: adjust godot rules

check-all is deprecated, but still work
if you're hesitating too - I'll remove this commit

1 files changed, 72 insertions, 0 deletions

diff --git a/vendor/github.com/googleapis/enterprise-certificate-proxy/client/util/util.go b/vendor/github.com/googleapis/enterprise-certificate-proxy/client/util/util.go
new file mode 100644
index 000000000..6b5f2806e
--- /dev/null
+++ b/vendor/github.com/googleapis/enterprise-certificate-proxy/client/util/util.go
@@ -0,0 +1,72 @@
+// Package util provides helper functions for the client.
+package util
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"path/filepath"
+	"runtime"
+)
+
+const configFileName = "enterprise_certificate_config.json"
+
+// EnterpriseCertificateConfig contains parameters for initializing signer.
+type EnterpriseCertificateConfig struct {
+	Libs Libs `json:"libs"`
+}
+
+// Libs specifies the locations of helper libraries.
+type Libs struct {
+	SignerBinary string `json:"signer_binary"`
+}
+
+// LoadSignerBinaryPath retrieves the path of the signer binary from the config file.
+func LoadSignerBinaryPath(configFilePath string) (path string, err error) {
+	jsonFile, err := os.Open(configFilePath)
+	if err != nil {
+		return "", err
+	}
+
+	byteValue, err := ioutil.ReadAll(jsonFile)
+	if err != nil {
+		return "", err
+	}
+	var config EnterpriseCertificateConfig
+	err = json.Unmarshal(byteValue, &config)
+	if err != nil {
+		return "", err
+	}
+	signerBinaryPath := config.Libs.SignerBinary
+	if signerBinaryPath == "" {
+		return "", errors.New("Signer binary path is missing.")
+	}
+	return signerBinaryPath, nil
+}
+
+func guessHomeDir() string {
+	// Prefer $HOME over user.Current due to glibc bug: golang.org/issue/13470
+	if v := os.Getenv("HOME"); v != "" {
+		return v
+	}
+	// Else, fall back to user.Current:
+	if u, err := user.Current(); err == nil {
+		return u.HomeDir
+	}
+	return ""
+}
+
+func getDefaultConfigFileDirectory() (directory string) {
+	if runtime.GOOS == "windows" {
+		return filepath.Join(os.Getenv("APPDATA"), "gcloud")
+	} else {
+		return filepath.Join(guessHomeDir(), ".config/gcloud")
+	}
+}
+
+// GetDefaultConfigFilePath returns the default path of the enterprise certificate config file created by gCloud.
+func GetDefaultConfigFilePath() (path string) {
+	return filepath.Join(getDefaultConfigFileDirectory(), configFileName)
+}