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util.go
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util.go
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package main
import (
"code.google.com/p/goauth2/oauth"
"encoding/base64"
"encoding/json"
"fmt"
"github.com/gorilla/sessions"
"io"
"strings"
"io/ioutil"
"net/http"
"os"
)
// Cookie store used to store the user's ID in the current session.
var store = sessions.NewCookieStore([]byte(secret))
func B64Dec(s string) string {
decoded, err := base64.StdEncoding.DecodeString(s)
if err != nil {
fmt.Println(s)
panic(err)
}
return string(decoded)
}
func B64Enc(s string) string {
return base64.StdEncoding.EncodeToString([]byte(s))
}
func UB64Dec(s string) string {
decoded, err := base64.URLEncoding.DecodeString(s)
if err != nil {
panic(err)
}
return string(decoded)
}
func UB64Enc(s string) string {
return base64.URLEncoding.EncodeToString([]byte(s))
}
func download(url string) []byte {
response, err := http.Get(url)
if err != nil {
return nil
}
defer response.Body.Close()
maxBytes := int64(262144) // 256K
contents, err := ioutil.ReadAll(io.LimitReader(response.Body, maxBytes))
if err != nil {
return nil
}
if int64(len(contents)) >= maxBytes {
return nil
}
return contents
}
func SanitizeUserId(userId string) string {
// NOTE(brandyn): If you create multiple oauth keys it appends a hyphen with some text to the latter ones, we want to normalize it
parts0 := strings.Split(userId, "_")
return strings.Split(parts0[0], "-")[0] + "_" + parts0[1]
}
// OAuth2.0 configuration variables.
func config(host string) *oauth.Config {
r := &oauth.Config{
ClientId: clientId,
ClientSecret: clientSecret,
Scope: scopes,
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
AccessType: "offline",
ApprovalPrompt: "force",
}
if len(host) > 0 {
r.RedirectURL = fullUrl + "/oauth2callback"
}
return r
}
func storeUserID(w http.ResponseWriter, r *http.Request, userId string) error {
session, err := store.Get(r, sessionName)
if err != nil {
fmt.Println("Couldn't get sessionName")
return err
}
fmt.Println("Saves session")
session.Values["userId"] = userId
return session.Save(r, w)
}
func deleteUserCookie(w http.ResponseWriter) {
http.SetCookie(w, &http.Cookie{Name: sessionName, MaxAge: -1, Path: "/"})
}
// userID retrieves the current user's ID from the session's cookies.
func userID(r *http.Request) (string, error) {
if singleUserMode {
return "singleUserMode_userid", nil
}
session, err := store.Get(r, sessionName)
if err != nil {
return "", err
}
userId := session.Values["userId"]
if userId != nil {
fmt.Println("Got session: " + userId.(string))
return userId.(string), nil
}
return "", nil
}
func storeCredential(userId string, token *oauth.Token, userInfo string) error {
// Store the tokens in the datastore.
err := setUserAttribute(userId, "user_info", userInfo)
if err != nil {
return err
}
val, err := json.Marshal(token)
if err != nil {
return err
}
return setUserAttribute(userId, "oauth_token", string(val))
}
func authTransport(userId string) *oauth.Transport {
if !allowAllUsers && !hasFlagSingle(userId, "flags", "user") {
return nil
}
val, err := getUserAttribute(userId, "oauth_token")
if err != nil {
return nil
}
tok := new(oauth.Token)
err = json.Unmarshal([]byte(val), tok)
if err != nil {
return nil
}
return &oauth.Transport{
Config: config(""),
Token: tok,
}
}
func deleteCredential(userId string) error {
return deleteUserAttribute(userId, "oauth_token")
}
func WriteFile(filename string, data string) {
fo, err := os.Create(filename)
if err != nil {
fmt.Println("Couldn't create file")
}
defer func() {
if err := fo.Close(); err != nil {
fmt.Println("Couldn't close file")
}
}()
if _, err := fo.Write([]byte(data)); err != nil {
fmt.Println("Couldn't write file")
}
}
func ReadFile(filename string) (string, error) {
fi, err := os.Open(filename)
if err != nil {
fmt.Println("Couldn't open file: " + filename)
return "", err
}
defer func() {
if err := fi.Close(); err != nil {
fmt.Println("Couldn't close file:" + filename)
}
}()
buf := make([]byte, 1024)
data := ""
for {
// read a chunk
n, err := fi.Read(buf)
if err != nil && err != io.EOF {
fmt.Println("Couldn't read file: " + filename)
return "", err
}
if n == 0 {
break
}
data = data + string(buf[:n])
}
return data, nil
}