Zig

POP3 GMail XOAUTH2 Authentication

See more GMail SMTP/IMAP/POP Examples

Demonstrates using OAuth2 authentication with pop.gmail.com.

Note: This example requires Chilkat v9.5.0.83 or greater.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

    mailman.setMailHost("pop.gmail.com");
    mailman.setMailPort(995);
    mailman.setPopSsl(true);

    mailman.setPopUsername("my_account@gmail.com");

    // If using OAuth2 authentication, leave the password empty.
    mailman.setPopPassword("");

    // Load our previously obtained OAuth2 access token.
    // See Getting a GMail POP3 OAuth2 Access Token
    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    json_token.loadFile("qa_data/tokens/gmail_pop3.json") catch {
        std.debug.print("{s}\n", .{try json_token.getLastErrorText(alloc)});
        return;
    };

    mailman.setOAuth2AccessToken(try json_token.stringOf(alloc, "access_token"));

    // Make the TLS connection to the POP3 server.
    mailman.pop3Connect() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    // Authenticate..
    mailman.pop3Authenticate() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    // Find out how many emails are on the server..
    const num_emails = mailman.checkMail();
    if (num_emails < 0) {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    }

    // Examine the POP3 session log:
    std.debug.print("{s}\n", .{try mailman.getPop3SessionLog(alloc)});

    // The POP3 session log will look something like this:

    // **** Connected to pop.gmail.com:995
    // < +OK Gpop ready for requests from 87.9.200.42 l16mb86351205iok
    // > AUTH XOAUTH2 dXNlcj1....VaMDJFAQE=
    // < +OK Welcome.
    // > STAT
    // < +OK 301 1627357
    //
    // -- Finished.

    // End the POP3 session and close the connection to the GMail server.
    mailman.pop3EndSession() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("-- Finished.\n", .{});
}