Zig

Salesforce OAuth2 Refresh Access Token

See more OAuth2 Examples

Demonstrates how to refresh a Salesforce Access Token.

Note: Use Chilkat v10.1.2 or later for 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 SalesForce OAuth2 Access Token via Authorization Flow

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

    // This is an example of a Salesforce OAuth2 access token to be refreshed:

    // {
    //   "access_token": "00D41000....uLZBpT6",
    //   "refresh_token": "5Aep....25xdGgkrV",
    //   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
    //   "scope": "refresh_token id",
    //   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
    //   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
    //   "token_type": "Bearer",
    //   "issued_at": "1738348388166"
    // }

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

    oauth2.setTokenEndpoint("https://login.salesforce.com/services/oauth2/token");

    // Replace this with your actual client ID (Consumer Key)
    oauth2.setClientId("CLIENT_ID");

    // Note: The client secret is not required because we configured our Connected App
    // to not require it for the refresh flow.  See the screenshot below.

    // 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.
    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/_salesforce.json", "utf-8", false) catch {};

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

    // --------------------------------------------------------------------------
    // Here's a screenshot of a Salesforce Connected App
    // which does not requires the secret for the authorization or refresh flow.
    // 
}