mirror of https://github.com/rclone/rclone
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Package jwtutil provides JWT utilities.
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package jwtutil
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import (
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"bytes"
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"crypto/rand"
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"crypto/rsa"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/config/configmap"
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"github.com/rclone/rclone/lib/oauthutil"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/jws"
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)
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// RandomHex creates a random string of the given length
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func RandomHex(n int) (string, error) {
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bytes := make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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// Config configures rclone using JWT
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func Config(id, name string, claims *jws.ClaimSet, header *jws.Header, queryParams map[string]string, privateKey *rsa.PrivateKey, m configmap.Mapper, client *http.Client) (err error) {
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payload, err := jws.Encode(header, claims, privateKey)
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if err != nil {
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return fmt.Errorf("jwtutil: failed to encode payload: %w", err)
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}
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req, err := http.NewRequest("POST", claims.Aud, nil)
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if err != nil {
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return fmt.Errorf("jwtutil: failed to create new request: %w", err)
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}
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q := req.URL.Query()
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q.Add("grant_type", "urn:ietf:params:oauth:grant-type:jwt-bearer")
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q.Add("assertion", payload)
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for key, value := range queryParams {
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q.Add(key, value)
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}
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queryString := q.Encode()
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req, err = http.NewRequest("POST", claims.Aud, bytes.NewBuffer([]byte(queryString)))
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if err != nil {
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return fmt.Errorf("jwtutil: failed to create new request: %w", err)
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("jwtutil: failed making auth request: %w", err)
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}
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s, err := bodyToString(resp.Body)
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if err != nil {
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fs.Debugf(nil, "jwtutil: failed to get response body")
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}
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if resp.StatusCode != 200 {
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err = errors.New(resp.Status)
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return fmt.Errorf("jwtutil: failed making auth request: %w", err)
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}
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defer func() {
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deferredErr := resp.Body.Close()
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if deferredErr != nil {
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err = fmt.Errorf("jwtutil: failed to close resp.Body: %w", err)
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}
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}()
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result := &response{}
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err = json.NewDecoder(strings.NewReader(s)).Decode(result)
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if result.AccessToken == "" && err == nil {
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err = errors.New("no AccessToken in Response")
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}
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if err != nil {
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return fmt.Errorf("jwtutil: failed to get token: %w", err)
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}
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token := &oauth2.Token{
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AccessToken: result.AccessToken,
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TokenType: result.TokenType,
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}
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e := result.ExpiresIn
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if e != 0 {
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token.Expiry = time.Now().Add(time.Duration(e) * time.Second)
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}
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return oauthutil.PutToken(name, m, token, true)
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}
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func bodyToString(responseBody io.Reader) (bodyString string, err error) {
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bodyBytes, err := ioutil.ReadAll(responseBody)
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if err != nil {
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return "", err
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}
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bodyString = string(bodyBytes)
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fs.Debugf(nil, "jwtutil: Response Body: "+bodyString)
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return bodyString, nil
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}
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type response struct {
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AccessToken string `json:"access_token"`
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TokenType string `json:"token_type"`
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ExpiresIn int `json:"expires_in"`
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}
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