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azure_cli_credential.go
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azure_cli_credential.go
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package identity
import (
"context"
"encoding/json"
"errors"
"os"
"os/exec"
"runtime"
"strings"
"sync"
"time"
"github.com/KarlGW/azcfg/auth"
)
// AzureCLICredential represent credentials handled by the Azure CLI. It
// contains all the necessary settings to perform token requests.
type AzureCLICredential struct {
tokens map[string]*auth.Token
mu sync.RWMutex
}
// NewAzureCLICredential creates and returns a new *AzureCLICredential.
func NewAzureCLICredential(options ...CredentialOption) (*AzureCLICredential, error) {
c := &AzureCLICredential{
tokens: make(map[string]*auth.Token),
}
opts := CredentialOptions{}
for _, option := range options {
option(&opts)
}
return c, nil
}
// Token returns a new auth.Token for requests to the Azure REST API.
func (c *AzureCLICredential) Token(ctx context.Context, options ...auth.TokenOption) (auth.Token, error) {
c.mu.Lock()
defer c.mu.Unlock()
opts := auth.TokenOptions{}
for _, option := range options {
option(&opts)
}
if c.tokens[opts.Scope] != nil && c.tokens[opts.Scope].ExpiresOn.UTC().After(time.Now().UTC()) {
return *c.tokens[opts.Scope], nil
}
token, err := cliToken(ctx, opts.Scope)
if err != nil {
return auth.Token{}, err
}
c.tokens[opts.Scope] = &token
return *c.tokens[opts.Scope], nil
}
// cliToken retreives a token from the Azure CLI.
var cliToken = func(ctx context.Context, scope string) (auth.Token, error) {
var command, flag, dir string
if runtime.GOOS == "windows" {
dir = os.Getenv("SYSTEMROOT")
command = "cmd.exe"
flag = "/c"
} else {
dir = "/bin"
command = "/bin/sh"
flag = "-c"
}
arguments := "az account get-access-token --output json --resource " + strings.TrimSuffix(scope, "/.default")
cmd := exec.CommandContext(ctx, command, flag, arguments)
cmd.Dir = dir
cmd.Env = os.Environ()
output, err := cmd.Output()
if err != nil {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) && exitErr.ExitCode() == 127 || strings.HasPrefix(string(exitErr.Stderr), "'az' is not recognized") {
return auth.Token{}, errors.New("azure cli not found")
}
return auth.Token{}, err
}
var r cliAuthResult
if err := json.Unmarshal(output, &r); err != nil {
return auth.Token{}, err
}
return auth.Token{
AccessToken: r.AccessToken,
ExpiresOn: time.Unix(int64(r.ExpiresOn), 0),
}, nil
}
// cliAuthResult represents a token response from the Azure CLI.
type cliAuthResult struct {
AccessToken string `json:"accessToken"`
ExpiresOn float64 `json:"expires_on"`
}