Zig

Download a Specific GMail Message into a Chilkat Email Object

See more GMail REST API Examples

Demonstrates how to download a GMail message into a Chilkat Email object. 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 http = try chilkat.Http.init();
    defer http.deinit();
    http.setAuthToken("GMAIL-ACCESS-TOKEN");

    // The id of the GMail message to download.
    const id = "166e50fed0b9b0cb";

    http.setUrlVar("userId", "me") catch {};
    http.setUrlVar("id", id) catch {};

    // Fetch the email.
    const url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw";
    const sb_json = try chilkat.StringBuilder.init();
    defer sb_json.deinit();
    http.downloadSb(url, "utf-8", sb_json) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadSb(sb_json) catch {};
    json.setEmitCompact(false);

    if (http.getLastStatus() != 200) {
        std.debug.print("{s}\n", .{try json.emit(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // The returned JSON contains something like this:

    // {
    //   "id": "166e50fed0b9b0cb",
    //   "threadId": "166e50fed0b9b0cb",
    //   "labelIds": [
    //     "CATEGORY_SOCIAL",
    //     "INBOX"
    //   ],
    //   "snippet": "...",
    //   "historyId": "582477",
    //   "internalDate": "1541441317000",
    //   "sizeEstimate": 28603,
    //   "raw": "BASE64URL_CONTENT"
    // }

    // The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
    // Let's decode and load into a Chilkat email object..
    const sb_raw = try chilkat.StringBuilder.init();
    defer sb_raw.deinit();
    json.stringOfSb("raw", sb_raw) catch {};
    sb_raw.decode("base64url", "utf-8") catch {};

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setFromMimeSb(sb_raw) catch {};

    // Now we can use the email API to do whatever we desire..
    std.debug.print("From: {s}\n", .{try email.getFromAddress(alloc)});
    std.debug.print("Subject: {s}\n", .{try email.getSubject(alloc)});
    // ...
}