Zig

Refresh Schwab OAuth2 Access Token

See more Schwab Examples

Demonstrates how to refresh a Schwab OAuth2 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.

    // See Get Schwab OAuth2 Access Token
    // for sample code showing how to obtain a Schwab access token for desktop apps.

    // This example assumes we previously obtained an OAuth2 access token for Schwab.

    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    json_token.loadFile("qa_data/tokens/schwab-access-token.json") catch {
        std.debug.print("Failed to load schwab-access-token.json\n", .{});
        return;
    };

    // The access token JSON looks something like this:

    // {
    //   "expires_in": 3600,
    //   "x_refresh_token_expires_in": 8726400,
    //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    //   "token_type": "bearer"
    // }

    const oauth2 = try chilkat.OAuth2.init();
    defer oauth2.deinit();

    oauth2.setTokenEndpoint("https://api.schwabapi.com/v1/oauth/token");

    // Replace these with actual values.
    oauth2.setClientId("APP_KEY");
    oauth2.setClientSecret("APP_SECRET");
    oauth2.setUseBasicAuth(true);

    // Get the "refresh_token"
    oauth2.setRefreshToken(try json_token.stringOf(alloc, "refresh_token"));

    // Send the HTTP POST to refresh the access token..
    oauth2.refreshAccessToken() catch {
        std.debug.print("{s}\n", .{try oauth2.getLastErrorText(alloc)});
        return;
    };

    // The response contains a new access token, but we must keep
    // our existing refresh token for when we need to refresh again in the future.
    json_token.updateString("access_token", try oauth2.getAccessToken(alloc)) catch {};

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    const sb_json = try chilkat.StringBuilder.init();
    defer sb_json.deinit();
    json_token.setEmitCompact(false);

    json_token.emitSb(sb_json) catch {};
    sb_json.writeFile("qa_data/tokens/schwab-access-token.json", "utf-8", false) catch {};

    std.debug.print("OAuth2 token refreshed!\n", .{});
    std.debug.print("New Access Token = {s}\n", .{try oauth2.getAccessToken(alloc)});
}