Zig

How to Generate an Azure Storage Account Shared Access Signature (SAS)

See more Azure Cloud Storage Examples

Shows how to generate a Shared Access Signature (SAS) for an Azure Storage Account.

Note: This example requires Chilkat v9.5.0.65 or greater.

Zig

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

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

    // Note: Requires Chilkat v9.5.0.65 or greater.

    // 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 Storage Account.
    // --------------------------------------------------------------------------

    // See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/constructing-an-account-sas
    // for details regarding the Azure Storage Account SAS fields.

    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.
    auth_sas.setStringToSign("accountname,signedpermissions,signedservice,signedresourcetype,signedstart,signedexpiry,signedIP,signedProtocol,signedversion,");

    //  The account name is "chilkat".  Use your own account name instead of "chilkat".
    //  Also use your own container name instead of "mycontainer".
    auth_sas.setNonTokenParam("accountname", "chilkat") catch {};

    auth_sas.setTokenParam("signedpermissions", "sp", "rwdlacup") catch {};
    auth_sas.setTokenParam("signedservice", "ss", "bfqt") catch {};
    auth_sas.setTokenParam("signedresourcetype", "srt", "sco") 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 {};

    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", "2015-04-05") catch {};

    // Note that we did not call SetTokenParam for "signedIP".  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 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/azureStorageAccountSas.txt", sas_token, "utf-8", false) catch {};
}