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Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example. 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.

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file
    // saved by this example: Get Docusign OAuth2 Access Token

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

    // The access token JSON looks like this:

    // {
    //   "access_token": "eyJ0eXA....YQyig",
    //   "token_type": "Bearer",
    //   "refresh_token": "eyJ0eXA....auE3eHKg",
    //   "expires_in": 28800
    // }

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

    // For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
    // For the production platform, the token endpoint is https://account.docusign.com/oauth/token
    oauth2.setTokenEndpoint("https://account-d.docusign.com/oauth/token");

    // Replace these with actual values.
    // The client ID is also known as the "integration key" in Docusign.
    oauth2.setClientId("MY_DOCUSIGN_CLIENT_ID");
    // This is your secret key for the authorization code grant.
    oauth2.setClientSecret("MY_DOCUSIGN_CLIENT_SECRET");

    // 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;
    };

    std.debug.print("New access token: {s}\n", .{try oauth2.getAccessToken(alloc)});
    std.debug.print("New refresh token: {s}\n", .{try oauth2.getRefreshToken(alloc)});

    // Update the JSON with the new tokens.
    json_token.updateString("access_token", try oauth2.getAccessToken(alloc)) catch {};
    json_token.updateString("refresh_token", try oauth2.getRefreshToken(alloc)) catch {};

    // Save the new JSON access token response to a file.
    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/docusign.json", "utf-8", false) catch {};

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