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我正在尝试使用 OfflineImap v7.2.1 将我的邮件从 gmail 同步到我的本地服务器。我遵循了本教程：Using Offlineimap with the Gmail IMAP API并让它工作！

这是我的.offlineimaprc文件：

 [general]
    accounts = ExampleCompany

    [Account ExampleCompany]
    localrepository = ExampleCompanyLocal
    remoterepository = ExampleCompanyRemote
    postsynchook = notmuch new
    #newer versions don't need this
    #status_backend = sqlite

    [Repository ExampleCompanyRemote]
    type = IMAP
    remotehost = imap.gmail.com
    remoteuser = my-username@gmail.com
    ssl = yes
    starttls = no
    sslcacertfile = /etc/ssl/certs/ca-certificates.crt
    ### You'll need to configure the gmail API stuff here:
    auth_mechanisms = XOAUTH2
    oauth2_client_id = XXXX7-eXXXX.apps.googleusercontent.com
    oauth2_client_secret = 9XXXXXP
    oauth2_request_url = https://accounts.google.com/o/oauth2/token
    #oauth2_refresh_token = 1/ZXXXXXw
    oauth2_access_token = ya29.XXXXXIHbcS
    ## remove Gmail prefix on IMAP folders
    nametrans = lambda f: f.replace('[Gmail]/', '') if 
   f.startswith('[Gmail]/') else f

    [Repository ExampleCompanyLocal]
    type = Maildir
    localfolders = ~/mail
    restoreatime = no
    # Do not sync this folder
    folderfilter = lambda folder: folder not in ['2007-2011-inbox']
    ## Remove GMAIL prefix on Google-specific IMAP folders that are pulled     down.
    nametrans = lambda f: '[Gmail]/' + f if f in ['Drafts', 'Starred',     'Important', 'Spam', 'Trash', 'All Mail', 'Sent Mail'] else f

我目前从谷歌生成我的Access Token并Refresh Token使用这个python 脚本。但是，我希望从 ios 应用程序生成此令牌，然后将其发送到后端以开始同步。我正在使用AppAuth来执行此操作，但在使用从 IOS 应用程序获取的这些凭据时，OfflineImap 总是出错。错误

ERROR: All authentication types failed:
     XOAUTH2: [AUTHENTICATIONFAILED] Invalid credentials (Failure)

知道为什么这些凭据无效吗？我在运行脚本和应用程序时使用相同的client_id。client_secret我想我错过了一些明显的东西。

这是 swift 对应用程序的授权请求：

 // builds authentication request
    let request = OIDAuthorizationRequest(configuration: configuration,
                                          clientId: "XXXX7-eXXXX.apps.googleusercontent.com",
                                          clientSecret: "9XXXXXP",
                                          scopes: [OIDScopeEmail],
                                          redirectURL: redirectURI,
                                          responseType: OIDResponseTypeCode,
                                          additionalParameters: nil)

谢谢

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