Zig

Rabobank Refresh OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access 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 requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // We previously obtained an access token and saved the JSON to a file using this example:
    // Get Rabobank OAuth2 Access Token

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadFile("qa_data/tokens/rabobank.json") catch {
        return;
    };

    // {
    //   "token_type": "Bearer",
    //   "access_token": "AAIkYTU0ZWM ... sxE0KL0HHWw",
    //   "expires_in": 3600,
    //   "consented_on": 1584641121,
    //   "scope": "ais.balances.read ais.transactions.read-90days ais.transactions.read-history",
    //   "refresh_token": "AAJXXSdN ... Uiblz9ILkxNBlytRGA",
    //   "refresh_token_expires_in": 157784760,
    //   "expires_on": "1584644722"
    // }

    // Refresh the access token by sending a POST like this:
    //

    // POST /oauth2/token
    // Headers:
    //     Content-Type: application/x-www-form-urlencoded
    //     Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)
    //
    // Body (x-www-form-urlencoded):
    //     grant_type: refresh_token
    //     refresh_token: REFRESH_TOKEN

    const req = try chilkat.HttpRequest.init();
    defer req.deinit();
    req.addParam("grant_type", "refresh_token");
    req.addParam("refresh_token", try json.stringOf(alloc, "refresh_token"));

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

    // Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
    http.setBasicAuth(true);
    http.setLogin("YOUR_APP_CLIENT_ID");
    http.setPassword("YOUR_APP_CLIENT_SECRET");

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

    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpReq("https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token", req, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // Load the JSON response.
    json.load(try resp.getBodyStr(alloc)) catch {};
    json.setEmitCompact(false);

    // Show the JSON response.
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    std.debug.print("Response status code: {d}\n", .{resp.getStatusCode()});

    // If the response status code is not 200, then it's an error.
    if (resp.getStatusCode() != 200) {
        return;
    }

    // Save the refreshed access token JSON to a file for future requests.
    const fac = try chilkat.FileAccess.init();
    defer fac.deinit();
    fac.writeEntireTextFile("qa_data/tokens/rabobank.json", try json.emit(alloc), "utf-8", false) catch {};
}