func aboutPage(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
fmt.Fprintf(w, "<h1>%v</h1>", appengine.DefaultVersionHostname(c))
token, expire, _ := appengine.AccessToken(c, "test")
fmt.Fprintf(w, "<p>AccessToken: %v %v", token, expire)
fmt.Fprintf(w, "<p>AppID: %v", appengine.AppID(c))
fmt.Fprintf(w, "<p>FQAppID: %v", c.FullyQualifiedAppID())
fmt.Fprintf(w, "<p>Go version: %v", runtime.Version())
fmt.Fprintf(w, "<p>Datacenter: %v", appengine.Datacenter())
fmt.Fprintf(w, "<p>InstanceID: %v", appengine.InstanceID())
fmt.Fprintf(w, "<p>IsDevAppServer: %v", appengine.IsDevAppServer())
fmt.Fprintf(w, "<p>RequestID: %v", appengine.RequestID(c))
fmt.Fprintf(w, "<p>ServerSoftware: %v", appengine.ServerSoftware())
sa, _ := appengine.ServiceAccount(c)
fmt.Fprintf(w, "<p>ServiceAccount: %v", sa)
keyname, signed, _ := appengine.SignBytes(c, []byte("test"))
fmt.Fprintf(w, "<p>SignBytes: %v %v", keyname, signed)
fmt.Fprintf(w, "<p>VersionID: %v", appengine.VersionID(c))
fmt.Fprintf(w, "<p>Request: %v", r)
r2 := c.Request()
fmt.Fprintf(w, "<p>Context Request type/value: %T %v", r2, r2)
}
// FetchToken fetches a new access token for the provided scopes.
func (c *AppEngineConfig) FetchToken(existing *oauth2.Token) (*oauth2.Token, error) {
token, expiry, err := appengine.AccessToken(c.context, strings.Join(c.scopes, " "))
if err != nil {
return nil, err
}
return &oauth2.Token{
AccessToken: token,
Expiry: expiry,
}, nil
}
// accessToken returns an access token for the given scope and caches it.
func accessToken(c appengine.Context, scope string) (string, error) {
if token, err := memcache.Get(c, "token"); err == nil {
return string(token.Value), nil
}
tok, expiry, err := appengine.AccessToken(c, scope)
if err != nil {
return "", err
}
// Ignore memcache errors and return the access token.
memcache.Set(c, &memcache.Item{
Key: "token",
Value: []byte(tok),
Expiration: expiry.Sub(time.Now()),
})
return tok, nil
}
func (t *transport) Refresh() error {
// Get a new access token for the application service account.
tok, expiry, err := appengine.AccessToken(t.Context, t.Scopes...)
if err != nil {
return err
}
t.Token = &oauth.Token{
AccessToken: tok,
Expiry: expiry,
}
if t.TokenCache != nil {
// Cache the token and ignore error (as we can always get a new one).
t.TokenCache.PutToken(t.Token)
}
return nil
}
func getGcsContext(c appengine.Context) (ctx context.Context, err error) {
// This turns out to be the way to get the GCS client library to work
accessToken, _, err := appengine.AccessToken(c, storage.ScopeFullControl)
if err != nil {
return nil, err
}
hc := &http.Client{}
hc.Transport = &oauth2.Transport{
Base: &urlfetch.Transport{
Context: c,
},
Source: oauth2.StaticTokenSource(&oauth2.Token{
AccessToken: accessToken,
}),
}
ctx = cloud.NewContext(appengine.AppID(c), hc)
return ctx, nil
}
import (
"time"
"appengine"
"golang.org/x/oauth2"
)
// AppEngineTokenSource returns a token source that fetches tokens
// issued to the current App Engine application's service account.
// If you are implementing a 3-legged OAuth 2.0 flow on App Engine
// that involves user accounts, see oauth2.Config instead.
//
// You are required to provide a valid appengine.Context as context.
func AppEngineTokenSource(ctx appengine.Context, scope ...string) oauth2.TokenSource {
return &appEngineTokenSource{
ctx: ctx,
scopes: scope,
fetcherFunc: aeFetcherFunc,
}
}
var aeFetcherFunc = func(ctx oauth2.Context, scope ...string) (string, time.Time, error) {
c, ok := ctx.(appengine.Context)
if !ok {
return "", time.Time{}, errInvalidContext
}
return appengine.AccessToken(c, scope...)
}
