Zig

UPS OAuth2 Client Credentials

See more UPS Examples

Get an OAuth2 access token for the UPS REST API using the client credentials flow (no interactivity with a web browser required). Zig

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

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

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

    const http = try chilkat.Http.init();
    defer http.deinit();

    // Implements the following CURL command:

    // curl -i -X POST \
    //   -u 2498righ8wr6aihe98rt8rhowirtyw9er6twe80rtywrehrt:nerf254578uh8rgt7y3h57358ouyth387h8h53h6yyh80hh578per9y7u5ruyuy4 \
    //   https://wwwcie.ups.com/security/v1/oauth/token \
    //   -H 'Content-Type: application/x-www-form-urlencoded' \
    //   -H 'x-merchant-id: 7B3027' \
    //   -d grant_type=client_credentials

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    http.setBasicAuth(true);
    http.setLogin("2498righ8wr6aihe98rt8rhowirtyw9er6twe80rtywrehrt");
    http.setPassword("nerf254578uh8rgt7y3h57358ouyth387h8h53h6yyh80hh578per9y7u5ruyuy4");

    const req = try chilkat.HttpRequest.init();
    defer req.deinit();
    req.addParam("grant_type", "client_credentials");

    req.addHeader("x-merchant-id", "7B3027");

    req.setHttpVerb("POST");
    req.setContentType("application/x-www-form-urlencoded");

    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpReq("https://wwwcie.ups.com/security/v1/oauth/token", req, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    const sb_response_body = try chilkat.StringBuilder.init();
    defer sb_response_body.deinit();
    resp.getBodySb(sb_response_body) catch {};

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

    std.debug.print("Response Body:\n", .{});
    std.debug.print("{s}\n", .{try j_resp.emit(alloc)});

    const resp_status_code = resp.getStatusCode();
    std.debug.print("Response Status Code = {d}\n", .{resp_status_code});
    if (resp_status_code >= 400) {
        std.debug.print("Response Header:\n", .{});
        std.debug.print("{s}\n", .{try resp.getHeader(alloc)});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // Save the OAuth2 access token for other examples to use.
    j_resp.writeFile("qa_data/tokens/ups_oauth2_token.json") catch {};

    // If successful, the OAuth2 access token JSON looks like this:

    // {
    //   "token_type": "Bearer",
    //   "issued_at": "1686911985606",
    //   "client_id": "2498righ8wr6aihe98rt8rhowirtyw9er6twe80rtywrehrt",
    //   "access_token": "eyJraW......R2sbqrY",
    //   "expires_in": "14399",
    //   "status": "approved"
    // }

    _ = try j_resp.stringOf(alloc, "token_type");
    _ = try j_resp.stringOf(alloc, "issued_at");
    _ = try j_resp.stringOf(alloc, "client_id");
    _ = try j_resp.stringOf(alloc, "access_token");
    _ = try j_resp.stringOf(alloc, "expires_in");
    _ = try j_resp.stringOf(alloc, "status");
}