Zig Requires Chilkat v11.0.0+

Generate an AWS (S3) Pre-Signed URL to Download File

See more Amazon S3 (new) Examples

Demonstrates how to generate a pre-signed URL to download a file from the Amazon S3 service. 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();

    http.setAwsAccessKey("AWS_ACCESS_KEY");
    http.setAwsSecretKey("AWS_SECRET_KEY");

    // Make sure to set your AWS region correctly
    http.setAwsRegion("us-east-1");

    const bucket_name = "chilkat100";
    const object_name = "starfish/starfish.jpg";
    const aws_service = "s3";

    // The signed URL will be valid for this number of seconds:
    const num_seconds_valid = 86400;

    // Choose between a URL beginning with "http://" or "https://"...
    const b_use_https = false;

    // Generate the pre-signed URL
    const pre_signed_url = http.s3GenPresignedUrl(alloc, "GET", b_use_https, bucket_name, object_name, num_seconds_valid, aws_service) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // The following URL can be copy-and-pasted into a browser..
    std.debug.print("Pre-Signed AWS S3 URL: {s}\n", .{pre_signed_url});

    // Here's an example of a pre-signed URL.
    // This URL will only work within 1 day (86400 seconds) after the time this example was published.
    //
    //     http://chilkat100.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=16QXXDGY83AJJR6RVQ02%2F20170111%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20170111T161959Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=72bf4fd9a15d7bbcdd313a3318d937a778905f62a3fbff9b789d8dc28acd9232

    // Now try to do an HTTP Download using the signed URL.
    http.download(pre_signed_url, "c:/temp/qa_output/starfish.jpg") catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Success.\n", .{});
}