mirror of
https://github.com/rclone/rclone.git
synced 2024-11-23 12:29:24 +08:00
349112df6b
Before this change two users could run `rclone config` for the same backend on the same machine at the same time. User A would get as far as starting the web server. User B would then fail to start the webserver, but it would open the browser on the /auth URL which would redirect the user to the login. This would then cause user B to authenticate to user A's rclone. This changes fixes the problem in two ways. Firstly it passes the state to the /auth call before redirecting and checks it there, erroring with a 403 error if it doesn't match. This would have fixed the problem on its own. Secondly it delays the opening of the web browser until after the auth webserver has started which prevents the user entering the credentials if another auth server is running. Fixes #3573
620 lines
18 KiB
Go
620 lines
18 KiB
Go
package oauthutil
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import (
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"context"
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"crypto/rand"
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"encoding/json"
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"fmt"
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"html/template"
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"net"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/config"
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"github.com/rclone/rclone/fs/config/configmap"
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"github.com/rclone/rclone/fs/fshttp"
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"github.com/skratchdot/open-golang/open"
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"golang.org/x/oauth2"
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)
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const (
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// TitleBarRedirectURL is the OAuth2 redirect URL to use when the authorization
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// code should be returned in the title bar of the browser, with the page text
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// prompting the user to copy the code and paste it in the application.
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TitleBarRedirectURL = "urn:ietf:wg:oauth:2.0:oob"
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// bindPort is the port that we bind the local webserver to
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bindPort = "53682"
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// bindAddress is binding for local webserver when active
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bindAddress = "127.0.0.1:" + bindPort
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// RedirectURL is redirect to local webserver when active
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RedirectURL = "http://" + bindAddress + "/"
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// RedirectPublicURL is redirect to local webserver when active with public name
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RedirectPublicURL = "http://localhost.rclone.org:" + bindPort + "/"
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// RedirectLocalhostURL is redirect to local webserver when active with localhost
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RedirectLocalhostURL = "http://localhost:" + bindPort + "/"
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// AuthResponse is a template to handle the redirect URL for oauth requests
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AuthResponse = `<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>{{ if .OK }}Success!{{ else }}Failure!{{ end }}</title>
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</head>
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<body>
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<h1>{{ if .OK }}Success!{{ else }}Failure!{{ end }}</h1>
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<hr>
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<pre style="width: 750px; white-space: pre-wrap;">
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{{ if eq .OK false }}
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Error: {{ .AuthError.Name }}<br>
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{{ if .AuthError.Description }}Description: {{ .AuthError.Description }}<br>{{ end }}
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{{ if .AuthError.Code }}Code: {{ .AuthError.Code }}<br>{{ end }}
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{{ if .AuthError.HelpURL }}Look here for help: <a href="{{ .AuthError.HelpURL }}">{{ .AuthError.HelpURL }}</a><br>{{ end }}
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{{ else }}
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{{ if .Code }}
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Please copy this code into rclone:
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{{ .Code }}
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{{ else }}
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All done. Please go back to rclone.
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{{ end }}
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{{ end }}
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</pre>
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</body>
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</html>
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`
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)
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// oldToken contains an end-user's tokens.
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// This is the data you must store to persist authentication.
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//
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// From the original code.google.com/p/goauth2/oauth package - used
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// for backwards compatibility in the rclone config file
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type oldToken struct {
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AccessToken string
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RefreshToken string
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Expiry time.Time
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}
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// GetToken returns the token saved in the config file under
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// section name.
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func GetToken(name string, m configmap.Mapper) (*oauth2.Token, error) {
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tokenString, ok := m.Get(config.ConfigToken)
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if !ok || tokenString == "" {
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return nil, errors.New("empty token found - please run rclone config again")
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}
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token := new(oauth2.Token)
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err := json.Unmarshal([]byte(tokenString), token)
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if err != nil {
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return nil, err
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}
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// if has data then return it
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if token.AccessToken != "" {
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return token, nil
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}
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// otherwise try parsing as oldToken
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oldtoken := new(oldToken)
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err = json.Unmarshal([]byte(tokenString), oldtoken)
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if err != nil {
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return nil, err
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}
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// Fill in result into new token
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token.AccessToken = oldtoken.AccessToken
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token.RefreshToken = oldtoken.RefreshToken
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token.Expiry = oldtoken.Expiry
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// Save new format in config file
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err = PutToken(name, m, token, false)
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if err != nil {
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return nil, err
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}
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return token, nil
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}
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// PutToken stores the token in the config file
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//
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// This saves the config file if it changes
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func PutToken(name string, m configmap.Mapper, token *oauth2.Token, newSection bool) error {
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tokenBytes, err := json.Marshal(token)
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if err != nil {
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return err
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}
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tokenString := string(tokenBytes)
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old, ok := m.Get(config.ConfigToken)
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if !ok || tokenString != old {
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err = config.SetValueAndSave(name, config.ConfigToken, tokenString)
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if newSection && err != nil {
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fs.Debugf(name, "Added new token to config, still needs to be saved")
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} else if err != nil {
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fs.Errorf(nil, "Failed to save new token in config file: %v", err)
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} else {
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fs.Debugf(name, "Saved new token in config file")
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}
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}
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return nil
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}
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// TokenSource stores updated tokens in the config file
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type TokenSource struct {
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mu sync.Mutex
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name string
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m configmap.Mapper
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tokenSource oauth2.TokenSource
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token *oauth2.Token
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config *oauth2.Config
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ctx context.Context
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expiryTimer *time.Timer // signals whenever the token expires
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}
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// If token has expired then first try re-reading it from the config
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// file in case a concurrently running rclone has updated it already
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func (ts *TokenSource) reReadToken() bool {
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tokenString, err := config.FileGetFresh(ts.name, config.ConfigToken)
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if err != nil {
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fs.Debugf(ts.name, "Failed to read token out of config file: %v", err)
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return false
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}
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newToken := new(oauth2.Token)
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err = json.Unmarshal([]byte(tokenString), newToken)
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if err != nil {
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fs.Debugf(ts.name, "Failed to parse token out of config file: %v", err)
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return false
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}
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if !newToken.Valid() {
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fs.Debugf(ts.name, "Loaded invalid token from config file - ignoring")
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return false
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}
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fs.Debugf(ts.name, "Loaded fresh token from config file")
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ts.token = newToken
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ts.tokenSource = nil // invalidate since we changed the token
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return true
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}
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// Token returns a token or an error.
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// Token must be safe for concurrent use by multiple goroutines.
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// The returned Token must not be modified.
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//
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// This saves the token in the config file if it has changed
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func (ts *TokenSource) Token() (*oauth2.Token, error) {
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ts.mu.Lock()
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defer ts.mu.Unlock()
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var (
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token *oauth2.Token
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err error
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changed = false
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)
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const maxTries = 5
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// Try getting the token a few times
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for i := 1; i <= maxTries; i++ {
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// Try reading the token from the config file in case it has
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// been updated by a concurrent rclone process
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if !ts.token.Valid() {
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if ts.reReadToken() {
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changed = true
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}
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}
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// Make a new token source if required
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if ts.tokenSource == nil {
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ts.tokenSource = ts.config.TokenSource(ts.ctx, ts.token)
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}
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token, err = ts.tokenSource.Token()
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if err == nil {
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break
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}
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fs.Debugf(ts.name, "Token refresh failed try %d/%d: %v", i, maxTries, err)
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time.Sleep(1 * time.Second)
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}
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if err != nil {
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return nil, err
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}
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changed = changed || (*token != *ts.token)
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ts.token = token
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if changed {
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// Bump on the expiry timer if it is set
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if ts.expiryTimer != nil {
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ts.expiryTimer.Reset(ts.timeToExpiry())
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}
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err = PutToken(ts.name, ts.m, token, false)
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if err != nil {
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return nil, err
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}
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}
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return token, nil
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}
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// Invalidate invalidates the token
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func (ts *TokenSource) Invalidate() {
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ts.mu.Lock()
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ts.token.AccessToken = ""
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ts.mu.Unlock()
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}
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// timeToExpiry returns how long until the token expires
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//
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// Call with the lock held
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func (ts *TokenSource) timeToExpiry() time.Duration {
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t := ts.token
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if t == nil {
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return 0
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}
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if t.Expiry.IsZero() {
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return 3e9 * time.Second // ~95 years
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}
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return t.Expiry.Sub(time.Now())
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}
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// OnExpiry returns a channel which has the time written to it when
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// the token expires. Note that there is only one channel so if
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// attaching multiple go routines it will only signal to one of them.
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func (ts *TokenSource) OnExpiry() <-chan time.Time {
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ts.mu.Lock()
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defer ts.mu.Unlock()
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if ts.expiryTimer == nil {
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ts.expiryTimer = time.NewTimer(ts.timeToExpiry())
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}
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return ts.expiryTimer.C
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}
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// Check interface satisfied
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var _ oauth2.TokenSource = (*TokenSource)(nil)
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// Context returns a context with our HTTP Client baked in for oauth2
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func Context(client *http.Client) context.Context {
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return context.WithValue(context.Background(), oauth2.HTTPClient, client)
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}
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// overrideCredentials sets the ClientID and ClientSecret from the
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// config file if they are not blank.
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// If any value is overridden, true is returned.
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// the origConfig is copied
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func overrideCredentials(name string, m configmap.Mapper, origConfig *oauth2.Config) (newConfig *oauth2.Config, changed bool) {
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newConfig = new(oauth2.Config)
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*newConfig = *origConfig
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changed = false
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ClientID, ok := m.Get(config.ConfigClientID)
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if ok && ClientID != "" {
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newConfig.ClientID = ClientID
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changed = true
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}
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ClientSecret, ok := m.Get(config.ConfigClientSecret)
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if ok && ClientSecret != "" {
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newConfig.ClientSecret = ClientSecret
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changed = true
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}
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AuthURL, ok := m.Get(config.ConfigAuthURL)
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if ok && AuthURL != "" {
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newConfig.Endpoint.AuthURL = AuthURL
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changed = true
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}
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TokenURL, ok := m.Get(config.ConfigTokenURL)
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if ok && TokenURL != "" {
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newConfig.Endpoint.TokenURL = TokenURL
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changed = true
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}
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return newConfig, changed
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}
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// NewClientWithBaseClient gets a token from the config file and
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// configures a Client with it. It returns the client and a
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// TokenSource which Invalidate may need to be called on. It uses the
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// httpClient passed in as the base client.
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func NewClientWithBaseClient(name string, m configmap.Mapper, config *oauth2.Config, baseClient *http.Client) (*http.Client, *TokenSource, error) {
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config, _ = overrideCredentials(name, m, config)
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token, err := GetToken(name, m)
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if err != nil {
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return nil, nil, err
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}
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// Set our own http client in the context
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ctx := Context(baseClient)
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// Wrap the TokenSource in our TokenSource which saves changed
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// tokens in the config file
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ts := &TokenSource{
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name: name,
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m: m,
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token: token,
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config: config,
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ctx: ctx,
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}
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return oauth2.NewClient(ctx, ts), ts, nil
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}
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// NewClient gets a token from the config file and configures a Client
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// with it. It returns the client and a TokenSource which Invalidate may need to be called on
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func NewClient(name string, m configmap.Mapper, oauthConfig *oauth2.Config) (*http.Client, *TokenSource, error) {
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return NewClientWithBaseClient(name, m, oauthConfig, fshttp.NewClient(fs.Config))
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}
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// Config does the initial creation of the token
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//
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// It may run an internal webserver to receive the results
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func Config(id, name string, m configmap.Mapper, config *oauth2.Config, opts ...oauth2.AuthCodeOption) error {
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return doConfig(id, name, m, nil, config, true, opts)
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}
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// ConfigNoOffline does the same as Config but does not pass the
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// "access_type=offline" parameter.
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func ConfigNoOffline(id, name string, m configmap.Mapper, config *oauth2.Config, opts ...oauth2.AuthCodeOption) error {
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return doConfig(id, name, m, nil, config, false, opts)
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}
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// ConfigErrorCheck does the same as Config, but allows the backend to pass a error handling function
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// This function gets called with the request made to rclone as a parameter if no code was found
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func ConfigErrorCheck(id, name string, m configmap.Mapper, errorHandler func(*http.Request) AuthError, config *oauth2.Config, opts ...oauth2.AuthCodeOption) error {
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return doConfig(id, name, m, errorHandler, config, true, opts)
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}
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func doConfig(id, name string, m configmap.Mapper, errorHandler func(*http.Request) AuthError, oauthConfig *oauth2.Config, offline bool, opts []oauth2.AuthCodeOption) error {
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oauthConfig, changed := overrideCredentials(name, m, oauthConfig)
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authorizeOnlyValue, ok := m.Get(config.ConfigAuthorize)
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authorizeOnly := ok && authorizeOnlyValue != "" // set if being run by "rclone authorize"
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// See if already have a token
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tokenString, ok := m.Get("token")
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if ok && tokenString != "" {
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fmt.Printf("Already have a token - refresh?\n")
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if !config.ConfirmWithConfig(m, "config_refresh_token", true) {
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return nil
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}
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}
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// Ask the user whether they are using a local machine
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isLocal := func() bool {
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fmt.Printf("Use auto config?\n")
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fmt.Printf(" * Say Y if not sure\n")
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fmt.Printf(" * Say N if you are working on a remote or headless machine\n")
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return config.ConfirmWithConfig(m, "config_is_local", true)
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}
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// Detect whether we should use internal web server
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useWebServer := false
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switch oauthConfig.RedirectURL {
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case RedirectURL, RedirectPublicURL, RedirectLocalhostURL:
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if changed {
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fmt.Printf("Make sure your Redirect URL is set to %q in your custom config.\n", oauthConfig.RedirectURL)
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}
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useWebServer = true
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if authorizeOnly {
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break
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}
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if !isLocal() {
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fmt.Printf("For this to work, you will need rclone available on a machine that has a web browser available.\n")
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fmt.Printf("Execute the following on your machine (same rclone version recommended) :\n")
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if changed {
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fmt.Printf("\trclone authorize %q %q %q\n", id, oauthConfig.ClientID, oauthConfig.ClientSecret)
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} else {
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fmt.Printf("\trclone authorize %q\n", id)
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}
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fmt.Println("Then paste the result below:")
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code := ""
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for code == "" {
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fmt.Printf("result> ")
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code = strings.TrimSpace(config.ReadLine())
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}
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token := &oauth2.Token{}
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err := json.Unmarshal([]byte(code), token)
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if err != nil {
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return err
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}
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return PutToken(name, m, token, true)
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}
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case TitleBarRedirectURL:
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useWebServer = authorizeOnly
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if !authorizeOnly {
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useWebServer = isLocal()
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}
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if useWebServer {
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// copy the config and set to use the internal webserver
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configCopy := *oauthConfig
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oauthConfig = &configCopy
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oauthConfig.RedirectURL = RedirectURL
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}
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}
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// Make random state
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stateBytes := make([]byte, 16)
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_, err := rand.Read(stateBytes)
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if err != nil {
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return err
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}
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state := fmt.Sprintf("%x", stateBytes)
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if offline {
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opts = append(opts, oauth2.AccessTypeOffline)
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}
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authURL := oauthConfig.AuthCodeURL(state, opts...)
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// Prepare webserver
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server := authServer{
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state: state,
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bindAddress: bindAddress,
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authURL: authURL,
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errorHandler: errorHandler,
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}
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if useWebServer {
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server.code = make(chan string, 1)
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server.err = make(chan error, 1)
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err := server.Init()
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if err != nil {
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return errors.Wrap(err, "failed to start auth webserver")
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}
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go server.Serve()
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defer server.Stop()
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authURL = "http://" + bindAddress + "/auth?state=" + state
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}
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// Generate a URL for the user to visit for authorization.
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_ = open.Start(authURL)
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fmt.Printf("If your browser doesn't open automatically go to the following link: %s\n", authURL)
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fmt.Printf("Log in and authorize rclone for access\n")
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var authCode string
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if useWebServer {
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// Read the code, and exchange it for a token.
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fmt.Printf("Waiting for code...\n")
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authCode = <-server.code
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authError := <-server.err
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if authCode != "" {
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fmt.Printf("Got code\n")
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} else {
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if authError != nil {
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return authError
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}
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return errors.New("failed to get code")
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}
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} else {
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// Read the code, and exchange it for a token.
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fmt.Printf("Enter verification code> ")
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authCode = config.ReadLine()
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}
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token, err := oauthConfig.Exchange(oauth2.NoContext, authCode)
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if err != nil {
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return errors.Wrap(err, "failed to get token")
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}
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// Print code if we do automatic retrieval
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if authorizeOnly {
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result, err := json.Marshal(token)
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if err != nil {
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return errors.Wrap(err, "failed to marshal token")
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}
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fmt.Printf("Paste the following into your remote machine --->\n%s\n<---End paste\n", result)
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}
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return PutToken(name, m, token, true)
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}
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// Local web server for collecting auth
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type authServer struct {
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state string
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listener net.Listener
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bindAddress string
|
|
code chan string
|
|
err chan error
|
|
authURL string
|
|
server *http.Server
|
|
errorHandler func(*http.Request) AuthError
|
|
}
|
|
|
|
// AuthError gets returned by the backend's errorHandler function
|
|
type AuthError struct {
|
|
Name string
|
|
Description string
|
|
Code string
|
|
HelpURL string
|
|
}
|
|
|
|
// AuthResponseData can fill the AuthResponse template
|
|
type AuthResponseData struct {
|
|
OK bool // Failure or Success?
|
|
Code string // code to paste into rclone config
|
|
AuthError
|
|
}
|
|
|
|
// Init gets the internal web server ready to receive config details
|
|
func (s *authServer) Init() error {
|
|
fs.Debugf(nil, "Starting auth server on %s", s.bindAddress)
|
|
mux := http.NewServeMux()
|
|
s.server = &http.Server{
|
|
Addr: s.bindAddress,
|
|
Handler: mux,
|
|
}
|
|
s.server.SetKeepAlivesEnabled(false)
|
|
mux.HandleFunc("/favicon.ico", func(w http.ResponseWriter, req *http.Request) {
|
|
http.Error(w, "", 404)
|
|
return
|
|
})
|
|
mux.HandleFunc("/auth", func(w http.ResponseWriter, req *http.Request) {
|
|
state := req.FormValue("state")
|
|
if state != s.state {
|
|
fs.Debugf(nil, "State did not match: want %q got %q", s.state, state)
|
|
http.Error(w, "State did not match - please try again", 403)
|
|
return
|
|
}
|
|
http.Redirect(w, req, s.authURL, http.StatusTemporaryRedirect)
|
|
return
|
|
})
|
|
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
|
|
w.Header().Set("Content-Type", "text/html")
|
|
fs.Debugf(nil, "Received request on auth server")
|
|
code := req.FormValue("code")
|
|
var err error
|
|
var t = template.Must(template.New("authResponse").Parse(AuthResponse))
|
|
resp := AuthResponseData{AuthError: AuthError{}}
|
|
if code != "" {
|
|
state := req.FormValue("state")
|
|
if state != s.state {
|
|
fs.Debugf(nil, "State did not match: want %q got %q", s.state, state)
|
|
resp.OK = false
|
|
resp.AuthError = AuthError{
|
|
Name: "Auth State doesn't match",
|
|
}
|
|
} else {
|
|
fs.Debugf(nil, "Successfully got code")
|
|
resp.OK = true
|
|
if s.code == nil {
|
|
resp.Code = code
|
|
}
|
|
}
|
|
} else {
|
|
fs.Debugf(nil, "No code found on request")
|
|
var authError AuthError
|
|
if s.errorHandler == nil {
|
|
authError = AuthError{
|
|
Name: "Auth Error",
|
|
Description: "No code found returned by remote server.",
|
|
}
|
|
} else {
|
|
authError = s.errorHandler(req)
|
|
}
|
|
err = fmt.Errorf("Error: %s\nCode: %s\nDescription: %s\nHelp: %s",
|
|
authError.Name, authError.Code, authError.Description, authError.HelpURL)
|
|
resp.OK = false
|
|
resp.AuthError = authError
|
|
w.WriteHeader(500)
|
|
}
|
|
if err := t.Execute(w, resp); err != nil {
|
|
fs.Debugf(nil, "Could not execute template for web response.")
|
|
}
|
|
if s.code != nil {
|
|
s.code <- code
|
|
s.err <- err
|
|
}
|
|
})
|
|
|
|
var err error
|
|
s.listener, err = net.Listen("tcp", s.bindAddress)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Serve the auth server, doesn't return
|
|
func (s *authServer) Serve() {
|
|
err := s.server.Serve(s.listener)
|
|
fs.Debugf(nil, "Closed auth server with error: %v", err)
|
|
}
|
|
|
|
// Stop the auth server by closing its socket
|
|
func (s *authServer) Stop() {
|
|
fs.Debugf(nil, "Closing auth server")
|
|
if s.code != nil {
|
|
close(s.code)
|
|
s.code = nil
|
|
}
|
|
_ = s.listener.Close()
|
|
|
|
// close the server
|
|
_ = s.server.Close()
|
|
}
|