Zig

Amazon SP-API Request an LWA access token

See more Amazon SP-API Examples

Request an LWA access token, make a secure HTTP POST to the LWA authentication server (https://api.amazon.com/auth/o2/token) 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 -X POST https://example.com/auth/o2/token \
    //   -H "Host: api.amazon.com" \
    //   -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" \
    //   -d "grant_type=refresh_token" \
    //   -d "refresh_token=Aztr|..." \
    //   -d "client_id=foodev" \
    //   -d "client_secret=Y76SDl2F"

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

    const req = try chilkat.HttpRequest.init();
    defer req.deinit();
    req.addParam("grant_type", "refresh_token");
    req.addParam("refresh_token", "Aztr|...");
    req.addParam("client_id", "foodev");
    req.addParam("client_secret", "Y76SDl2F");

    req.addHeader("Host", "api.amazon.com");

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

    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpReq("https://api.amazon.com/auth/o2/token", req, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    const status_code = resp.getStatusCode();
    std.debug.print("Status Code = {d}\n", .{status_code});

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.load(try resp.getBodyStr(alloc)) catch {};

    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    if (status_code != 200) {
        std.debug.print("Failed.\n", .{});
        return;
    }

    // Success returns this JSON:

    // {
    //   "access_token": "Atza|...",
    //   "refresh_token": "Atzr|...",
    //   "token_type": "bearer",
    //   "expires_in": 3600
    // }

    // Save the JSON token to a file for use in subsequent calls.
    // (this example is passing a relative file path.  You don't need to save to a file
    // if, for example, you keep the access token in-memory for subsequent use...)
    try json.writeFile("qa_data/tokens/sp_api_lwa_token.json");

    std.debug.print("access_token: {s}\n", .{try json.stringOf(alloc, "access_token")});
    std.debug.print("Success.\n", .{});
}