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package msauth
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"strings"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/microsoft"
)
const (
deviceCodeGrantType = "urn:ietf:params:oauth:grant-type:device_code"
authorizationPendingError = "authorization_pending"
)
// DeviceCode is returned on device auth initiation
type DeviceCode struct {
DeviceCode string `json:"device_code"`
UserCode string `json:"user_code"`
VerificationURL string `json:"verification_url"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
Message string `json:"message"`
}
// DeviceAuthorizationGrant performs OAuth 2.0 device authorization grant and returns auto-refreshing TokenSource
func (m *Manager) DeviceAuthorizationGrant(ctx context.Context, tenantID, clientID string, scopes []string, callback func(*DeviceCode) error) (oauth2.TokenSource, error) {
endpoint := microsoft.AzureADEndpoint(tenantID)
endpoint.AuthStyle = oauth2.AuthStyleInParams
config := &oauth2.Config{
ClientID: clientID,
Endpoint: endpoint,
Scopes: scopes,
}
if t, ok := m.TokenCache[generateKey(tenantID, clientID)]; ok {
tt, err := config.TokenSource(ctx, t).Token()
if err == nil {
return config.TokenSource(ctx, tt), nil
}
if _, ok := err.(*oauth2.RetrieveError); !ok {
return nil, err
}
}
scope := strings.Join(scopes, " ")
res, err := http.PostForm(deviceCodeURL(tenantID), url.Values{"client_id": {clientID}, "scope": {scope}})
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
b, _ := ioutil.ReadAll(res.Body)
return nil, fmt.Errorf("%s: %s", res.Status, string(b))
}
dc := &DeviceCode{}
dec := json.NewDecoder(res.Body)
err = dec.Decode(&dc)
if err != nil {
return nil, err
}
if callback != nil {
err = callback(dc)
if err != nil {
return nil, err
}
} else {
fmt.Fprintln(os.Stderr, dc.Message)
}
values := url.Values{
"client_id": {clientID},
"grant_type": {deviceCodeGrantType},
"device_code": {dc.DeviceCode},
}
interval := dc.Interval
if interval == 0 {
interval = 5
}
for {
time.Sleep(time.Second * time.Duration(interval))
token, err := m.requestToken(ctx, tenantID, clientID, values)
if err == nil {
m.Cache(tenantID, clientID, token)
return config.TokenSource(ctx, token), nil
}
tokenError, ok := err.(*TokenError)
if !ok || tokenError.ErrorObject != authorizationPendingError {
return nil, err
}
}
}
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