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main.go
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main.go
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package main
import (
"bytes"
"context"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"runtime/debug"
"strings"
"time"
"github.com/AzureAD/microsoft-authentication-library-for-go/apps/public"
)
const (
// Client application ID for accessing Azure DevOps.
// https://github.com/git-ecosystem/git-credential-manager/blob/8c430c9484c90433ab30c25df7fc1005fe2f4ba4/src/shared/Microsoft.AzureRepos/AzureDevOpsConstants.cs#L15
// magic https://developercommunity.visualstudio.com/t/non-interactive-aad-auth-works-for-visual-studio-a/387853
clientID = "872cd9fa-d31f-45e0-9eab-6e460a02d1f1"
// Authority (identity provider) for accessing Azure DevOps.
// https://learn.microsoft.com/en-us/azure/active-directory/develop/msal-client-application-configuration#authority
// tested with personal account
authority = "https://login.microsoftonline.com/organizations"
// Scope for accessing Azure DevOps.
// https://learn.microsoft.com/en-us/azure/devops/organizations/accounts/manage-personal-access-tokens-via-api?view=azure-devops
scope = "499b84ac-1321-427f-aa17-267ca6975798/.default"
)
var (
verbose bool
// populated by GoReleaser https://goreleaser.com/cookbooks/using-main.version
version = "dev"
)
func printVersion() {
info, ok := debug.ReadBuildInfo()
if ok && version == "dev" {
version = info.Main.Version
}
if verbose {
fmt.Fprintf(os.Stderr, "git-credential-azure %s\n", version)
}
}
func parse(input string) map[string]string {
lines := strings.Split(string(input), "\n")
pairs := map[string]string{}
for _, line := range lines {
parts := strings.SplitN(line, "=", 2)
if len(parts) >= 2 {
pairs[parts[0]] = parts[1]
}
}
return pairs
}
func main() {
ctx := context.Background()
flag.BoolVar(&verbose, "verbose", false, "log debug information to stderr")
var device bool
flag.BoolVar(&device, "device", false, "instead of opening a web browser locally, print a code to enter on another device")
flag.Usage = func() {
printVersion()
fmt.Fprintln(os.Stderr, "usage: git credential-azure [<options>] <action>")
fmt.Fprintln(os.Stderr, "")
fmt.Fprintln(os.Stderr, "Options:")
flag.PrintDefaults()
fmt.Fprintln(os.Stderr, "")
fmt.Fprintln(os.Stderr, "Actions:")
fmt.Fprintln(os.Stderr, " get Generate credential")
fmt.Fprintln(os.Stderr, "")
fmt.Fprintln(os.Stderr, "See also https://github.com/hickford/git-credential-azure")
}
flag.Parse()
args := flag.Args()
if len(args) != 1 {
flag.Usage()
os.Exit(2)
}
switch args[0] {
case "get":
input, err := io.ReadAll(os.Stdin)
if err != nil {
log.Fatalln(err)
}
pairs := parse(string(input))
if pairs["host"] != "dev.azure.com" {
return
}
printVersion()
if verbose {
fmt.Fprintln(os.Stderr, "input:", pairs)
}
var result public.AuthResult
if device {
result, err = authenticateDevice(ctx)
} else {
result, err = authenticate(ctx, pairs["username"])
}
if err != nil {
log.Fatalln(err)
}
if verbose {
fmt.Fprintf(os.Stderr, "result: %+v\n", result)
}
organization := strings.SplitN(pairs["path"], "/", 2)[0]
if organization == "" && !strings.Contains(pairs["username"], "@") {
organization = pairs["username"]
}
var pt PatToken
if organization == "" {
fmt.Fprintln(os.Stderr, "unable to create personal access token because Azure DevOps organization not specified")
}
if organization != "" {
pt, err = getPAT(organization, result.AccessToken)
if err != nil {
fmt.Fprintln(os.Stderr, "error acquiring personal access token", err)
}
if verbose {
fmt.Fprintf(os.Stderr, "pat: %+v\n", pt)
}
}
output := map[string]string{}
var password string
var expiry time.Time
var username string
if pt.Token != "" {
password = pt.Token
expiry = pt.ValidTo
username = organization
} else {
password = result.AccessToken
expiry = result.ExpiresOn
username = result.Account.PreferredUsername
}
output["password"] = password
if username != pairs["username"] {
output["username"] = username
}
if !expiry.IsZero() {
output["password_expiry_utc"] = fmt.Sprintf("%d", expiry.UTC().Unix())
}
if verbose {
fmt.Fprintln(os.Stderr, "output:", output)
}
for key, v := range output {
fmt.Printf("%s=%s\n", key, v)
}
}
}
func authenticate(ctx context.Context, username string) (public.AuthResult, error) {
client, err := public.New(clientID, public.WithAuthority(authority))
if err != nil {
return public.AuthResult{}, err
}
scopes := []string{scope}
opts := []public.AcquireInteractiveOption{}
if strings.Contains(username, "@") {
opts = append(opts, public.WithLoginHint(username))
}
return client.AcquireTokenInteractive(ctx, scopes, opts...)
}
func authenticateDevice(ctx context.Context) (public.AuthResult, error) {
client, err := public.New(clientID, public.WithAuthority(authority))
if err != nil {
return public.AuthResult{}, err
}
scopes := []string{scope}
deviceCode, err := client.AcquireTokenByDeviceCode(ctx, scopes)
if err != nil {
return public.AuthResult{}, err
}
if verbose {
fmt.Fprintf(os.Stderr, "deviceCode: %+v\n", deviceCode)
}
fmt.Fprintf(os.Stderr, "%s\n", deviceCode.Result.Message)
return deviceCode.AuthenticationResult(ctx)
}
func getPAT(organization, accessToken string) (PatToken, error) {
// https://learn.microsoft.com/en-us/rest/api/azure/devops/tokens/pats/create?view=azure-devops-rest-7.1&tabs=HTTP
// sadly https://github.com/microsoft/azure-devops-go-api doesn't have this function
url := fmt.Sprintf("https://vssps.dev.azure.com/%s/_apis/tokens/pats?api-version=7.1-preview.1", organization)
j := map[string]any{
"scope": "vso.code_write vso.packaging",
}
body, err := json.Marshal(j)
if err != nil {
return PatToken{}, err
}
req, err := http.NewRequest("POST", url, bytes.NewReader(body))
if err != nil {
return PatToken{}, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", accessToken))
response, err := http.DefaultClient.Do(req)
if err != nil {
return PatToken{}, err
}
body, err = io.ReadAll(response.Body)
if err != nil {
return PatToken{}, err
}
ptr := PatTokenResult{}
err = json.Unmarshal(body, &ptr)
if err != nil {
return PatToken{}, err
}
if ptr.PatTokenError != "" && ptr.PatTokenError != "none" {
return PatToken{}, errors.New(ptr.PatTokenError)
}
return ptr.PatToken, nil
}
// https://learn.microsoft.com/en-us/rest/api/azure/devops/tokens/pats/create?view=azure-devops-rest-7.1&tabs=HTTP#pattokenresult
type PatTokenResult struct {
PatToken PatToken `json:"patToken"`
PatTokenError string `json:"patTokenError"`
}
// https://learn.microsoft.com/en-us/rest/api/azure/devops/tokens/pats/create?view=azure-devops-rest-7.1&tabs=HTTP#pattoken
type PatToken struct {
AuthorizationId string `json:"authorizationId"`
DisplayName string `json:"displayName"`
Scope string `json:"string"`
TargetAccounts []string `json:"targetAccounts"`
Token string `json:"token"`
ValidFrom time.Time `json:"validFrom"`
ValidTo time.Time `json:"validTo"`
}