/
auth.go
376 lines (309 loc) · 9.22 KB
/
auth.go
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package bapi
import (
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"math/rand"
"net/http"
"net/url"
"sort"
"strconv"
"strings"
"time"
)
type requestToken struct {
token string
secret string
callbackConfirmed bool
}
type accessToken struct {
OAuthToken string
OAuthTokenSecret string
}
func createAccessToken(client *BClient) (*accessToken, error) {
accessToken := readCachedAccessToken()
if accessToken != nil {
return accessToken, nil
}
accessToken, err := auth(client.ConsumerKey, client.ConsumerSecret)
if err != nil {
return nil, err
}
cacheAccessToken(accessToken)
return accessToken, nil
}
func cacheAccessToken(token *accessToken) {
tokenByte, _ := json.MarshalIndent(token, "", " ")
err := ioutil.WriteFile("/tmp/token", tokenByte, 0644)
if err != nil {
panic(err)
}
}
func readCachedAccessToken() *accessToken {
tokenBytes, err := ioutil.ReadFile("/tmp/token")
if err != nil {
return nil
}
token := accessToken{}
json.Unmarshal(tokenBytes, &token)
return &token
}
func signDataRequest(req *http.Request, t *accessToken, consumerKey, consumerSecret string) {
params := map[string]string{}
params["oauth_consumer_key"] = consumerKey
params["oauth_nonce"] = nonce()
params["oauth_signature_method"] = "HMAC-SHA1"
params["oauth_timestamp"] = timestamp()
params["oauth_version"] = "1.0"
params["oauth_token"] = t.OAuthToken
key := escape(consumerSecret) + "&" + escape(t.OAuthTokenSecret)
base := requestString(req.Method, req.URL.String(), params)
params["oauth_signature"] = sign(base, key)
req.Header.Add("Authorization", authorizationString(params))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
}
func auth(consumerKey, consumerSecret string) (*accessToken, error) {
urlToken := "https://bitbucket.org/api/1.0/oauth/request_token/"
token, err := createRequestToken(urlToken, consumerKey, consumerSecret)
if err != nil {
return nil, err
}
redirectUrl, err := authorizationRedirect(token)
if err != nil {
return nil, err
}
fmt.Println(redirectUrl)
//read token returned on the page
fmt.Println("Enter code: ")
var verifier string
fmt.Scanln(&verifier)
accessToken, err := authorizeToken(token, consumerKey, consumerSecret, verifier)
if err != nil {
return nil, err
}
return accessToken, nil
}
func authorizeToken(t *requestToken, consumerKey, consumerSecret, verifier string) (*accessToken, error) {
accessTokenUrl, _ := url.Parse("https://bitbucket.org/api/1.0/oauth/access_token/")
req := http.Request{
URL: accessTokenUrl,
Method: "POST",
ProtoMajor: 1,
ProtoMinor: 1,
Close: true,
}
req.Header = http.Header{}
signAuthorizeToken(&req, t, consumerKey, consumerSecret, verifier)
resp, err := http.DefaultClient.Do(&req)
if err != nil {
return nil, err
}
accessToken, err := parseAccessToken(resp.Body)
if err != nil {
return nil, err
}
return accessToken, nil
}
func parseAccessToken(reader io.ReadCloser) (*accessToken, error) {
body, err := ioutil.ReadAll(reader)
reader.Close()
if err != nil {
return nil, err
}
str := string(body)
parts, err := url.ParseQuery(str)
if err != nil {
return nil, err
}
oauthToken := parts.Get("oauth_token")
oauthTokenSecret := parts.Get("oauth_token_secret")
token := accessToken{OAuthToken: oauthToken, OAuthTokenSecret: oauthTokenSecret}
return &token, nil
}
func signAuthorizeToken(req *http.Request, t *requestToken, consumerKey, consumerSecret, verifier string) {
params := map[string]string{}
params["oauth_verifier"] = verifier
params["oauth_consumer_key"] = consumerKey
params["oauth_nonce"] = nonce()
params["oauth_signature_method"] = "HMAC-SHA1"
params["oauth_timestamp"] = timestamp()
params["oauth_version"] = "1.0"
params["oauth_callback"] = "oob"
params["oauth_token"] = t.token
key := escape(consumerSecret) + "&" + escape(t.secret)
base := requestString(req.Method, req.URL.String(), params)
params["oauth_signature"] = sign(base, key)
req.Header.Add("Authorization", fmt.Sprintf("OAuth %s", authorizationString(params)))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
}
func authorizationRedirect(t *requestToken) (string, error) {
authorizationUrl := "https://bitbucket.org/!api/1.0/oauth/authenticate"
redirectUrl, _ := url.Parse(authorizationUrl)
params := make(url.Values)
params.Add("oauth_token", t.token)
redirectUrl.RawQuery = params.Encode()
u := redirectUrl.String()
if strings.HasPrefix(u, "https://bitbucket.org/%21api/") {
u = strings.Replace(u, "/%21api/", "/!api/", -1)
}
return u, nil
}
func createRequestToken(tokenUrl, consumerKey, consumerSecret string) (*requestToken, error) {
requestTokenUrl, _ := url.Parse(tokenUrl)
req := http.Request{
URL: requestTokenUrl,
Method: "POST",
ProtoMajor: 1,
ProtoMinor: 1,
Close: true,
}
req.Header = http.Header{}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
signRequest(&req, consumerKey, consumerSecret)
resp, err := http.DefaultClient.Do(&req)
if err != nil {
panic(err)
}
requestToken, err := parserequestToken(resp.Body)
if err != nil {
return nil, err
}
return requestToken, nil
}
func signRequest(req *http.Request, consumerKey, consumerSecret string) {
params := map[string]string{}
params["oauth_consumer_key"] = consumerKey
params["oauth_nonce"] = nonce()
params["oauth_signature_method"] = "HMAC-SHA1"
params["oauth_timestamp"] = timestamp()
params["oauth_version"] = "1.0"
params["oauth_callback"] = "oob" //"http://localhost:8080/auth/bitbucket"
//we'll need to sign any form values
if req.Form != nil {
for k, _ := range req.Form {
params[k] = req.Form.Get(k)
}
}
queryParams := req.URL.Query()
for k, _ := range queryParams {
params[k] = queryParams.Get(k)
}
key := escape(consumerSecret) + "&" + escape("")
base := requestString(req.Method, req.URL.String(), params)
params["oauth_signature"] = sign(base, key)
req.Header.Add("Authorization", fmt.Sprintf("OAuth %s", authorizationString(params)))
}
func parserequestToken(reader io.ReadCloser) (*requestToken, error) {
body, err := ioutil.ReadAll(reader)
reader.Close()
if err != nil {
return nil, err
}
requestData := string(body)
parts, err := url.ParseQuery(requestData)
if err != nil {
return nil, err
}
token := requestToken{}
token.token = parts.Get("oauth_token")
token.secret = parts.Get("oauth_token_secret")
token.callbackConfirmed = parts.Get("oauth_callback_confirmed") == "true"
//some error checking ...
switch {
case len(token.token) == 0:
return nil, errors.New(requestData)
case len(token.secret) == 0:
return nil, errors.New(requestData)
}
return &token, nil
}
// Generates an HMAC Signature for an OAuth1.0a request.
func sign(message, key string) string {
hashfun := hmac.New(sha1.New, []byte(key))
hashfun.Write([]byte(message))
rawsignature := hashfun.Sum(nil)
base64signature := make([]byte, base64.StdEncoding.EncodedLen(len(rawsignature)))
base64.StdEncoding.Encode(base64signature, rawsignature)
return string(base64signature)
}
func authorizationString(params map[string]string) string {
// loop through params, add keys to map
var keys []string
for key, _ := range params {
keys = append(keys, key)
}
// sort the array of header keys
sort.StringSlice(keys).Sort()
// create the signed string
var str string
var cnt = 0
// loop through sorted params and append to the string
for _, key := range keys {
// we previously encoded all params (url params, form data & oauth params)
// but for the authorization string we should only encode the oauth params
if !strings.HasPrefix(key, "oauth_") {
continue
}
if cnt > 0 {
str += ","
}
str += fmt.Sprintf("%s=%q", key, escape(params[key]))
cnt++
}
return str
}
// Nonce generator, seeded with current time
var nonceGenerator = rand.New(rand.NewSource(time.Now().Unix()))
// Nonce generates a random string. Nonce's are uniquely generated
// for each request.
func nonce() string {
return strconv.FormatInt(nonceGenerator.Int63(), 10)
}
// Timestamp generates a timestamp, expressed in the number of seconds
// since January 1, 1970 00:00:00 GMT.
func timestamp() string {
return strconv.FormatInt(time.Now().Unix(), 10)
}
func requestString(method string, uri string, params map[string]string) string {
// loop through params, add keys to map
var keys []string
for key, _ := range params {
keys = append(keys, key)
}
// sort the array of header keys
sort.StringSlice(keys).Sort()
// create the signed string
result := method + "&" + escape(uri)
// loop through sorted params and append to the string
for pos, key := range keys {
if pos == 0 {
result += "&"
} else {
result += escape("&")
}
result += escape(fmt.Sprintf("%s=%s", key, escape(params[key])))
}
return result
}
func escape(s string) string {
t := make([]byte, 0, 3*len(s))
for i := 0; i < len(s); i++ {
c := s[i]
if isEscapable(c) {
t = append(t, '%')
t = append(t, "0123456789ABCDEF"[c>>4])
t = append(t, "0123456789ABCDEF"[c&15])
} else {
t = append(t, s[i])
}
}
return string(t)
}
func isEscapable(b byte) bool {
return !('A' <= b && b <= 'Z' || 'a' <= b && b <= 'z' || '0' <= b && b <= '9' || b == '-' || b == '.' || b == '_' || b == '~')
}