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access_token_provider.go
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/
access_token_provider.go
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package pluginproxy
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strconv"
"sync"
"time"
"golang.org/x/oauth2"
"github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/plugins"
"golang.org/x/oauth2/jwt"
)
var (
tokenCache = tokenCacheType{
cache: map[string]*jwtToken{},
}
oauthJwtTokenCache = oauthJwtTokenCacheType{
cache: map[string]*oauth2.Token{},
}
)
type tokenCacheType struct {
cache map[string]*jwtToken
sync.Mutex
}
type oauthJwtTokenCacheType struct {
cache map[string]*oauth2.Token
sync.Mutex
}
type accessTokenProvider struct {
route *plugins.AppPluginRoute
datasourceId int64
datasourceVersion int
}
type jwtToken struct {
ExpiresOn time.Time `json:"-"`
ExpiresOnString string `json:"expires_on"`
AccessToken string `json:"access_token"`
}
func newAccessTokenProvider(ds *models.DataSource, pluginRoute *plugins.AppPluginRoute) *accessTokenProvider {
return &accessTokenProvider{
datasourceId: ds.Id,
datasourceVersion: ds.Version,
route: pluginRoute,
}
}
func (provider *accessTokenProvider) getAccessToken(data templateData) (string, error) {
tokenCache.Lock()
defer tokenCache.Unlock()
if cachedToken, found := tokenCache.cache[provider.getAccessTokenCacheKey()]; found {
if cachedToken.ExpiresOn.After(time.Now().Add(time.Second * 10)) {
logger.Info("Using token from cache")
return cachedToken.AccessToken, nil
}
}
urlInterpolated, err := interpolateString(provider.route.TokenAuth.Url, data)
if err != nil {
return "", err
}
params := make(url.Values)
for key, value := range provider.route.TokenAuth.Params {
interpolatedParam, err := interpolateString(value, data)
if err != nil {
return "", err
}
params.Add(key, interpolatedParam)
}
getTokenReq, _ := http.NewRequest("POST", urlInterpolated, bytes.NewBufferString(params.Encode()))
getTokenReq.Header.Add("Content-Type", "application/x-www-form-urlencoded")
getTokenReq.Header.Add("Content-Length", strconv.Itoa(len(params.Encode())))
resp, err := client.Do(getTokenReq)
if err != nil {
return "", err
}
defer resp.Body.Close()
var token jwtToken
if err := json.NewDecoder(resp.Body).Decode(&token); err != nil {
return "", err
}
expiresOnEpoch, _ := strconv.ParseInt(token.ExpiresOnString, 10, 64)
token.ExpiresOn = time.Unix(expiresOnEpoch, 0)
tokenCache.cache[provider.getAccessTokenCacheKey()] = &token
logger.Info("Got new access token", "ExpiresOn", token.ExpiresOn)
return token.AccessToken, nil
}
func (provider *accessTokenProvider) getJwtAccessToken(ctx context.Context, data templateData) (string, error) {
oauthJwtTokenCache.Lock()
defer oauthJwtTokenCache.Unlock()
if cachedToken, found := oauthJwtTokenCache.cache[provider.getAccessTokenCacheKey()]; found {
if cachedToken.Expiry.After(time.Now().Add(time.Second * 10)) {
logger.Debug("Using token from cache")
return cachedToken.AccessToken, nil
}
}
conf := &jwt.Config{}
if val, ok := provider.route.JwtTokenAuth.Params["client_email"]; ok {
interpolatedVal, err := interpolateString(val, data)
if err != nil {
return "", err
}
conf.Email = interpolatedVal
}
if val, ok := provider.route.JwtTokenAuth.Params["private_key"]; ok {
interpolatedVal, err := interpolateString(val, data)
if err != nil {
return "", err
}
conf.PrivateKey = []byte(interpolatedVal)
}
if val, ok := provider.route.JwtTokenAuth.Params["token_uri"]; ok {
interpolatedVal, err := interpolateString(val, data)
if err != nil {
return "", err
}
conf.TokenURL = interpolatedVal
}
conf.Scopes = provider.route.JwtTokenAuth.Scopes
token, err := getTokenSource(conf, ctx)
if err != nil {
return "", err
}
oauthJwtTokenCache.cache[provider.getAccessTokenCacheKey()] = token
logger.Info("Got new access token", "ExpiresOn", token.Expiry)
return token.AccessToken, nil
}
var getTokenSource = func(conf *jwt.Config, ctx context.Context) (*oauth2.Token, error) {
tokenSrc := conf.TokenSource(ctx)
token, err := tokenSrc.Token()
if err != nil {
return nil, err
}
return token, nil
}
func (provider *accessTokenProvider) getAccessTokenCacheKey() string {
return fmt.Sprintf("%v_%v_%v_%v", provider.datasourceId, provider.datasourceVersion, provider.route.Path, provider.route.Method)
}