Zig

Create an Azure Service SAS

See more Azure Cloud Storage Examples

Shows how to generate an Azure Service SAS. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // ----------------------------------------------------------------------------------------------
    // Create a Shared Access Signature (SAS) token for an Azure Service (Blob, Queue, Table, or File)
    // -----------------------------------------------------------------------------------------------

    // See https://docs.microsoft.com/en-us/rest/api/storageservices/create-service-sas
    // for details.

    const auth_sas = try chilkat.AuthAzureSAS.init();
    defer auth_sas.deinit();
    auth_sas.setAccessKey("AZURE_ACCESS_KEY");

    // Specify the format of the string to sign.
    // Each comma character in the following string represents a LF ("\n") character.
    // The names specified in the StringToSign are replaced with the values specified
    // in the subsequent calls to SetTokenParam and SetNonTokenParam,.

    // Note: The trailing comma in the StringToSign is intentional and important. This indicates that the
    // string to sign will end with a "\n".

    // Also note: The names in the StringToSign are case sensitive.  The names
    // specified in the 1st argument in the calls to SetNonTokenParam and SetTokenParam should
    // match a name listed in StringToSign.

    // Version 2018-11-09 and later
    //
    // Version 2018-11-09 adds support for the signed resource and signed blob snapshot time fields.
    // These must be included in the string-to-sign. To construct the string-to-sign for Blob service resources, use the following format:
    //
    // StringToSign = signedpermissions + "\n" +
    //                signedstart + "\n" +
    //                signedexpiry + "\n" +
    //                canonicalizedresource + "\n" +
    //                signedidentifier + "\n" +
    //                signedIP + "\n" +
    //                signedProtocol + "\n" +
    //                signedversion + "\n" +
    //                signedResource + "\n"
    //                signedSnapshotTime + "\n" +
    //                rscc + "\n" +
    //                rscd + "\n" +
    //                rsce + "\n" +
    //                rscl + "\n" +
    //                rsct
    //

    auth_sas.setStringToSign("signedpermissions,signedstart,signedexpiry,canonicalizedresource,signedidentifier,signedIP,signedProtocol,signedversion,signedResource,signedSnapshotTime,rscc,rscd,rsce,rscl,rsct");

    auth_sas.setTokenParam("signedpermissions", "sp", "rw") catch {};

    const dt = try chilkat.DateTime.init();
    defer dt.deinit();
    dt.setFromCurrentSystemTime() catch {};
    auth_sas.setTokenParam("signedstart", "st", try dt.getAsIso8601(alloc, "YYYY-MM-DDThh:mmTZD", false)) catch {};

    // This SAS token will be valid for 30 days.
    dt.addDays(30) catch {};
    auth_sas.setTokenParam("signedexpiry", "se", try dt.getAsIso8601(alloc, "YYYY-MM-DDThh:mmTZD", false)) catch {};

    // The canonicalizedresouce portion of the string is a canonical path to the signed resource. It must include the service name (blob, table, queue or file) for version
    // 2021-08-06 or later, the storage account name, and the resource name, and must be URL-decoded. Names of blobs must include the blob�s container. Table names must be
    // lower-case. The following examples show how to construct the canonicalizedresource portion of the string, depending on the type of resource.
    // For example:
    // URL = https://chilkat.blob.core.windows.net/mycontainer/starfish.jpg
    // canonicalizedresource = "/blob/chilkat/mycontainer/starfish.jpg"
    // IMPORTANT: See https://docs.microsoft.com/en-us/rest/api/storageservices/create-service-sas for all details..
    auth_sas.setNonTokenParam("canonicalizedresource", "/blob/chilkat/mycontainer/starfish.jpg") catch {};

    auth_sas.setTokenParam("signedProtocol", "spr", "https") catch {};

    //  Specifiy values and query param names for each field.
    //  If a field is not specified, then an empty string will be used for its value.
    auth_sas.setTokenParam("signedversion", "sv", "2018-11-09") catch {};

    // Indicate that we are creating a service SAS that is limited to the blob resource.
    // (Specify b if the shared resource is a blob. This grants access to the content and metadata of the blob.
    //  Specify c if the shared resource is a container. This grants access to the content and metadata of any blob in the container, and to the list of blobs in the container. )
    auth_sas.setTokenParam("signedResource", "sr", "b") catch {};

    // Note that we did not call SetTokenParam for "signedIP", "signedSnapshotTime", "rscc", and others.  For any omitted fields
    // the value will default to the empty string.

    // Generate the SAS token.
    const sas_token = auth_sas.generateToken(alloc) catch {
        std.debug.print("{s}\n", .{try auth_sas.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("SAS token: {s}\n", .{sas_token});

    // Save the SAS Service token to a file.
    // We can then use this pre-generated token for future Azure Storage Account operations.
    const fac = try chilkat.FileAccess.init();
    defer fac.deinit();
    fac.writeEntireTextFile("qa_data/tokens/azureStorageServiceSas.txt", sas_token, "utf-8", false) catch {};
}