mirror of
https://github.com/rclone/rclone.git
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638 lines
18 KiB
Go
638 lines
18 KiB
Go
package oauthutil
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import (
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"context"
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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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"net/url"
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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/rclone/rclone/lib/random"
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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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// RedirectPublicSecureURL is a public https URL which
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// redirects to the local webserver
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RedirectPublicSecureURL = "https://oauth.rclone.org/"
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// AuthResponseTemplate is a template to handle the redirect URL for oauth requests
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AuthResponseTemplate = `<!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: {{ .Name }}<br>
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{{ if .Description }}Description: {{ .Description }}<br>{{ end }}
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{{ if .Code }}Code: {{ .Code }}<br>{{ end }}
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{{ if .HelpURL }}Look here for help: <a href="{{ .HelpURL }}">{{ .HelpURL }}</a><br>{{ end }}
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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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</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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// AuthResult is returned from the web server after authorization
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// success or failure
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type AuthResult struct {
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OK bool // Failure or Success?
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Name string
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Description string
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Code string
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HelpURL string
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Form url.Values // the complete contents of the form
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Err error // any underlying error to report
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}
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// Error satisfies the error interface so AuthResult can be used as an error
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func (ar *AuthResult) Error() string {
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status := "Error"
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if ar.OK {
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status = "OK"
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}
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return fmt.Sprintf("%s: %s\nCode: %q\nDescription: %s\nHelp: %s",
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status, ar.Name, ar.Code, ar.Description, ar.HelpURL)
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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, config, true, nil, opts)
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}
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// CheckAuthFn is called when a good Auth has been received
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type CheckAuthFn func(*oauth2.Config, *AuthResult) error
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// ConfigWithCallback 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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//
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// When the AuthResult is known the checkAuth function is called if set
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func ConfigWithCallback(id, name string, m configmap.Mapper, config *oauth2.Config, checkAuth CheckAuthFn, opts ...oauth2.AuthCodeOption) error {
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return doConfig(id, name, m, config, true, checkAuth, 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, config, false, nil, opts)
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}
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func doConfig(id, name string, m configmap.Mapper, oauthConfig *oauth2.Config, offline bool, checkAuth CheckAuthFn, 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 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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default:
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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 := config.ReadNonEmptyLine("result> ")
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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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}
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// Make random state
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state, err := random.Password(128)
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if err != nil {
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return err
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}
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// Generate oauth URL
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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 if needed
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var server *authServer
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if useWebServer {
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server = newAuthServer(bindAddress, state, authURL)
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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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// Open the URL for the user to visit
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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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// Read the code via the webserver or manually
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var auth *AuthResult
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if useWebServer {
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fmt.Printf("Waiting for code...\n")
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auth = <-server.result
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if !auth.OK || auth.Code == "" {
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return auth
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}
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fmt.Printf("Got code\n")
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if checkAuth != nil {
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err = checkAuth(oauthConfig, auth)
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if err != nil {
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return err
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}
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}
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} else {
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auth = &AuthResult{
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Code: config.ReadNonEmptyLine("Enter verification code> "),
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}
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}
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// Exchange the code for a token
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token, err := oauthConfig.Exchange(oauth2.NoContext, auth.Code)
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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 are doing a manual auth
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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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}
|
|
|
|
// Local web server for collecting auth
|
|
type authServer struct {
|
|
state string
|
|
listener net.Listener
|
|
bindAddress string
|
|
authURL string
|
|
server *http.Server
|
|
result chan *AuthResult
|
|
}
|
|
|
|
// newAuthServer makes the webserver for collecting auth
|
|
func newAuthServer(bindAddress, state, authURL string) *authServer {
|
|
return &authServer{
|
|
state: state,
|
|
bindAddress: bindAddress,
|
|
authURL: authURL, // http://host/auth redirects to here
|
|
result: make(chan *AuthResult, 1),
|
|
}
|
|
}
|
|
|
|
// Receive the auth request
|
|
func (s *authServer) handleAuth(w http.ResponseWriter, req *http.Request) {
|
|
fs.Debugf(nil, "Received %s request on auth server to %q", req.Method, req.URL.Path)
|
|
|
|
// Reply with the response to the user and to the channel
|
|
reply := func(status int, res *AuthResult) {
|
|
w.WriteHeader(status)
|
|
w.Header().Set("Content-Type", "text/html")
|
|
var t = template.Must(template.New("authResponse").Parse(AuthResponseTemplate))
|
|
if err := t.Execute(w, res); err != nil {
|
|
fs.Debugf(nil, "Could not execute template for web response.")
|
|
}
|
|
s.result <- res
|
|
}
|
|
|
|
// Parse the form parameters and save them
|
|
err := req.ParseForm()
|
|
if err != nil {
|
|
reply(http.StatusBadRequest, &AuthResult{
|
|
Name: "Parse form error",
|
|
Description: err.Error(),
|
|
})
|
|
return
|
|
}
|
|
|
|
// get code, error if empty
|
|
code := req.Form.Get("code")
|
|
if code == "" {
|
|
reply(http.StatusBadRequest, &AuthResult{
|
|
Name: "Auth Error",
|
|
Description: "No code returned by remote server",
|
|
})
|
|
return
|
|
}
|
|
|
|
// check state
|
|
state := req.Form.Get("state")
|
|
if state != s.state {
|
|
reply(http.StatusBadRequest, &AuthResult{
|
|
Name: "Auth state doesn't match",
|
|
Description: fmt.Sprintf("Expecting %q got %q", s.state, state),
|
|
})
|
|
return
|
|
}
|
|
|
|
// code OK
|
|
reply(http.StatusOK, &AuthResult{
|
|
OK: true,
|
|
Code: code,
|
|
Form: req.Form,
|
|
})
|
|
}
|
|
|
|
// 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, "", http.StatusNotFound)
|
|
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", http.StatusForbidden)
|
|
return
|
|
}
|
|
http.Redirect(w, req, s.authURL, http.StatusTemporaryRedirect)
|
|
return
|
|
})
|
|
mux.HandleFunc("/", s.handleAuth)
|
|
|
|
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")
|
|
close(s.result)
|
|
_ = s.listener.Close()
|
|
|
|
// close the server
|
|
_ = s.server.Close()
|
|
}
|