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source.go
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source.go
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// Package token represents an oauth2.TokenSource which has the ability to
// refresh the access token through the oauth server.
package token
import (
"bytes"
"encoding/json"
"net/http"
"os"
"github.com/marcopeereboom/acdb/debug"
"golang.org/x/oauth2"
)
const refreshURL = "https://go-acd.appspot.com/refresh"
// Source provides a Source with support for refreshing from the acd server.
type Source struct {
path string
token *oauth2.Token
// debug
mask int
debug.Debugger
}
// New returns a new Source implementing oauth2.TokenSource. The path must
// exist on the filesystem and must be of permissions 0600.
func New(path string, mask int, d debug.Debugger) (*Source, error) {
if _, err := os.Stat(path); os.IsNotExist(err) {
return nil, ErrFileNotFound
}
ts := &Source{
path: path,
token: new(oauth2.Token),
mask: mask,
Debugger: d,
}
ts.readToken()
return ts, nil
}
// Token returns an oauth2.Token. If the cached token (in (*Source).path) has
// expired, it will fetch the token from the server and cache it before
// returning it.
func (ts *Source) Token() (*oauth2.Token, error) {
if !ts.token.Valid() {
ts.Log(ts.mask, "[TKN] token is not valid, it has probably expired")
if err := ts.refreshToken(); err != nil {
return nil, err
}
if err := ts.saveToken(); err != nil {
return nil, err
}
}
return ts.token, nil
}
func (ts *Source) readToken() error {
ts.Log(ts.mask, "[TKN] reading the token from %s", ts.path)
f, err := os.Open(ts.path)
if err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrOpenFile, ts.path)
return ErrOpenFile
}
if err := json.NewDecoder(f).Decode(ts.token); err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrJSONDecoding, err)
return ErrJSONDecoding
}
ts.Log(ts.mask, "[TKN] token loaded successfully")
return nil
}
func (ts *Source) saveToken() error {
ts.Log(ts.mask, "[TKN] saving the token to %s", ts.path)
f, err := os.Create(ts.path)
if err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrCreateFile, ts.path)
return ErrCreateFile
}
if err := json.NewEncoder(f).Encode(ts.token); err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrJSONEncoding, err)
return ErrJSONEncoding
}
ts.Log(ts.mask, "[TKN] token saved successfully")
return nil
}
func (ts *Source) refreshToken() error {
ts.Log(ts.mask, "[TKN] refreshing the token from %q", refreshURL)
data, err := json.Marshal(ts.token)
if err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrJSONEncoding, err)
return ErrJSONEncoding
}
req, err := http.NewRequest("POST", refreshURL, bytes.NewBuffer(data))
if err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrCreatingHTTPRequest, err)
return ErrCreatingHTTPRequest
}
req.Header.Set("Content-Type", "application/json")
res, err := (&http.Client{}).Do(req)
if err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrDoingHTTPRequest, err)
return ErrDoingHTTPRequest
}
defer res.Body.Close()
if err := json.NewDecoder(res.Body).Decode(ts.token); err != nil {
ts.Log(ts.mask, "[TKN] %s: %s", ErrJSONDecodingResponseBody, err)
return ErrJSONDecodingResponseBody
}
ts.Log(ts.mask, "[TKN] token was refreshed successfully")
return nil
}