gmail api发送邮件不起作用C＃控制台应用程序（身份验证范围不足）

好的：我决定采用GMAIL.API提供的凭据文件，并将其放入单行环境变量中，然后将JSON转换为GoogleClientSecrets：

    private static GoogleClientSecrets GetSecretsFromEnvironment()
    {
        var environmentConfiguration = new ConfigurationBuilder()
            .AddEnvironmentVariables()
            .Build();   
        var secretsEnv = environmentConfiguration["GoogleSecrets"];
        var secrets = JsonConvert.DeserializeObject<GoogleClientSecrets>(secretsEnv);
        return secrets;
    }

appsettings.json

{
  "MailSettings": {
    "account": "[email protected]",
    "subject": "Please Confirm Account",
    "from": "[email protected]",
    "HTML": "<b>Hello {0}</b>"
  }
}

由Google云控制台提供的凭据.json。我做成一个单行字符串并添加到EnvironmentVariable

和调用代码：

using Google.Apis.Auth.OAuth2;
using Google.Apis.Gmail.v1;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Mail;
using System.Threading;
using System.Threading.Tasks;
namespace SendMail
{
    class Program
    {
        // If modifying these scopes, delete your previously saved credentials
        // at ~/.credentials/gmail-dotnet-quickstart.json
        static string[] Scopes = { GmailService.Scope.GmailAddonsCurrentActionCompose, GmailService.Scope.GmailAddonsCurrentMessageAction, GmailService.Scope.GmailSend };
        static string ApplicationName = "Restful Resting Place";
        static async Task Main(params string[] args)
        {
            try
            {
                var configuration = new ConfigurationBuilder()
                    .AddJsonFile("appsettings.json")
                    .Build();
                Dictionary<string, string> MailSettings;
                MailSettings = configuration.GetSection("MailSettings").GetChildren().ToDictionary(x => x.Key, x => x.Value);
                MailSettings.Add("to", args[0]);
                MailSettings.Add("link", args[1]);
                GoogleClientSecrets gSecrets = GetSecretsFromEnvironment();
                string credPath = "token.json";
                UserCredential gcredential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
                       gSecrets.Secrets,
                       Scopes,
                       MailSettings["account"],
                       CancellationToken.None,
                       new FileDataStore(credPath, true));
                var service = new GmailService(new BaseClientService.Initializer()
                {
                    HttpClientInitializer = gcredential,
                    ApplicationName = ApplicationName,
                });

                SendItTwo(service, MailSettings);
                Console.WriteLine()
            }catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }   
        }
        private static GoogleClientSecrets GetSecretsFromEnvironment()
        {
            var environmentConfiguration = new ConfigurationBuilder()
                .AddEnvironmentVariables()
                .Build();   
            var secretsEnv = environmentConfiguration["GoogleSecrets"];
            var secrets = JsonConvert.DeserializeObject<GoogleClientSecrets>(secretsEnv);
            return secrets;
        }
        public static void SendItTwo(GmailService gmail,   Dictionary<string,string> dict)
        {
            MailMessage mailmsg = new MailMessage();
            {
                mailmsg.Subject = dict["subject"];
                mailmsg.Body = string.Format(dict["HTML"],dict["link"]);
                mailmsg.From = new MailAddress(dict["from"]);
                mailmsg.To.Add(new MailAddress(dict["to"]));         
                mailmsg.IsBodyHtml = true;
            }

            ////add attachment if specified
            if (dict.ContainsKey("attachement"))
            {
                if (File.Exists(dict["attachment"]))
                {
                    Attachment data = new Attachment(dict["attachment"]);
                    mailmsg.Attachments.Add(data);

                }else
                {
                    Console.WriteLine("Error: Invalid Attachemnt");
                }
            }     
            //Make mail message a Mime message
            MimeKit.MimeMessage mimemessage = MimeKit.MimeMessage.CreateFromMailMessage(mailmsg);
            Google.Apis.Gmail.v1.Data.Message finalmessage = new Google.Apis.Gmail.v1.Data.Message();
            finalmessage.Raw = Base64UrlEncode(mimemessage.ToString());  
            var result = gmail.Users.Messages.Send(finalmessage, "me").Execute();
        } 
        public static string Base64UrlEncode(string input)
        {
            var inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
            return Convert.ToBase64String(inputBytes).Replace("+", "-").Replace("/", "_").Replace("=", "");
        }
    }
}