Zig

Amazon Glacier Get Vault Access Policy

See more Amazon Glacier Examples

Demonstrates how to retrieve the access-policy subresource set on the vault 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.

    const rest = try chilkat.Rest.init();
    defer rest.deinit();

    // Connect to the Amazon AWS REST server in the desired region.
    const b_tls = true;
    const port = 443;
    const b_auto_reconnect = true;
    try rest.connect("glacier.us-west-2.amazonaws.com", port, b_tls, b_auto_reconnect);

    // Provide AWS credentials.
    const auth_aws = try chilkat.AuthAws.init();
    defer auth_aws.deinit();
    auth_aws.setAccessKey("AWS_ACCESS_KEY");
    auth_aws.setSecretKey("AWS_SECRET_KEY");
    auth_aws.setServiceName("glacier");
    auth_aws.setRegion("us-west-2");

    try rest.setAuthAws(auth_aws);

    // --------------------------------------------------------------------------
    // Note: The above REST connection and setup of the AWS credentials
    // can be done once.  After connecting, any number of REST calls can be made.
    // The "auto reconnect" property passed to rest.Connect indicates that if
    // the connection is lost, a REST method call will automatically reconnect
    // if needed.
    // --------------------------------------------------------------------------

    // For more information, see Glacier Get Vault Access Policy Reference Documentation
    //
    rest.addHeader("x-amz-glacier-version", "2012-06-01") catch {};

    // Get the access policy for the "chilkat" vault.
    const sb_response_body = try chilkat.StringBuilder.init();
    defer sb_response_body.deinit();
    rest.fullRequestNoBodySb("GET", "/AWS_ACCOUNT_ID/vaults/chilkat/access-policy", sb_response_body) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    const resp_status_code = rest.getResponseStatusCode();
    if (resp_status_code >= 400) {
        std.debug.print("Response Status Code = {d}\n", .{resp_status_code});
        std.debug.print("Response Header:\n", .{});
        std.debug.print("{s}\n", .{try rest.getResponseHeader(alloc)});
        std.debug.print("Response Body:\n", .{});
        std.debug.print("{s}\n", .{try sb_response_body.getAsString(alloc)});
        return;
    }

    // Success is indicated by a 200 response status.
    std.debug.print("response status code = {d}\n", .{resp_status_code});

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadSb(sb_response_body) catch {};
    json.setEmitCompact(false);

    // Returns JSON such as this:
    // {
    //   "Policy": "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"Define-owner-access-rights\",\"Effect\":\"Allow\",\"Principal\":{\"AWS\":\"arn:aws:iam::9999999999999:root\"},\"Action\":\"glacier:DeleteArchive\",\"Resource\":\"arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat\"}]}"
    // }

    // Unwrap...
    const json_policy = try chilkat.JsonObject.init();
    defer json_policy.deinit();
    json_policy.load(try json.stringOf(alloc, "Policy")) catch {};
    json_policy.setEmitCompact(false);

    std.debug.print("{s}\n", .{try json_policy.emit(alloc)});
    std.debug.print("----\n", .{});

    // The jsonPolicy contains:

    // {
    //   "Version": "2012-10-17",
    //   "Statement": [
    //     {
    //       "Sid": "Define-owner-access-rights",
    //       "Effect": "Allow",
    //       "Principal": {
    //         "AWS": "arn:aws:iam::9999999999999:root"
    //       },
    //       "Action": "glacier:DeleteArchive",
    //       "Resource": "arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat"
    //     }
    //   ]
    // }
    //

    // Use this online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    // To parse the above contents of jsonPolicy...
    var i: i32 = 0;
    var sid: [:0]const u8 = "";
    var effect: [:0]const u8 = "";
    var principal_aws: [:0]const u8 = "";
    var action: [:0]const u8 = "";
    var resource: [:0]const u8 = "";

    _ = try json_policy.stringOf(alloc, "Version");
    i = 0;
    const count_i = json_policy.sizeOfArray("Statement");
    while (i < count_i) {
        json_policy.setI(i);
        sid = try json_policy.stringOf(alloc, "Statement[i].Sid");
        effect = try json_policy.stringOf(alloc, "Statement[i].Effect");
        principal_aws = try json_policy.stringOf(alloc, "Statement[i].Principal.AWS");
        action = try json_policy.stringOf(alloc, "Statement[i].Action");
        resource = try json_policy.stringOf(alloc, "Statement[i].Resource");
        i = i + 1;
    }
}