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Manually testing Azure Shared Access Signatures in Ruby
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| # see http://stackoverflow.com/questions/21994466/signature-did-not-match-on-azure-sas-url | |
| # see https://msdn.microsoft.com/library/azure/dn140255.aspx | |
| # see https://msdn.microsoft.com/en-us/library/azure/dn140256.aspx | |
| # see https://github.com/Azure/azure-sdk-for-ruby/issues/162 | |
| # This assumes the Azure Ruby SDK is already loaded and initialized with appropriate config | |
| # Note we need the empty strings as the empty lines are required in the signed string | |
| DEFAULTS = { | |
| path: '/', | |
| resource: 'b', | |
| permissions: 'r', | |
| start: '', | |
| expiry: '', | |
| identifier: '', | |
| version: '2013-08-15', | |
| cache_control: '', | |
| content_disposition: '', | |
| content_encoding: '', | |
| content_language: '', | |
| content_type: '' | |
| } | |
| def prepared_string(options = {}, account_name = Azure.config.storage_account_name) | |
| options = DEFAULTS.merge(options) | |
| s = [] | |
| s << options[:permissions] | |
| s << options[:start] | |
| s << options[:expiry] | |
| s << canonicalized_resource(options[:path], options[:resource]) | |
| s << options[:identifier] | |
| s << options[:version] | |
| s << options[:cache_control] | |
| s << options[:content_disposition] | |
| s << options[:content_encoding] | |
| s << options[:content_language] | |
| s << options[:content_type] | |
| puts | |
| puts s.join("\n") | |
| puts | |
| s.join("\n") | |
| end | |
| def canonicalized_resource(path, resource = 'b', account_name = Azure.config.storage_account_name) | |
| # If resource is a container, remove the last part (which is the filename) | |
| path = path.split('/').reverse.drop(1).reverse.join('/') if resource == 'c' | |
| "/#{account_name}/#{path}" | |
| end | |
| # We should be able to reuse much of Azure::Core::Auth::SharedKey if implementing properly within the SDK | |
| def create_signature(string_to_sign, access_key = Azure.config.storage_access_key) | |
| signature = OpenSSL::HMAC.digest('sha256', Base64.strict_decode64(access_key), string_to_sign.encode(Encoding::UTF_8)) | |
| Base64.strict_encode64(signature) | |
| end | |
| def create_signed_query_string(options = {}, account_name = Azure.config.storage_account_name) | |
| options = DEFAULTS.merge(options) | |
| base = "https://#{account_name}.blob.core.windows.net" | |
| uri = Addressable::URI.new | |
| # Parts | |
| parts = {} | |
| parts[:st] = URI.unescape(options[:start]) unless options[:start] == '' | |
| parts[:se] = URI.unescape(options[:expiry]) | |
| parts[:sr] = URI.unescape(options[:resource]) | |
| parts[:sp] = URI.unescape(options[:permissions]) | |
| parts[:si] = URI.unescape(options[:identifier]) unless options[:identifier] == '' | |
| parts[:sv] = URI.unescape(options[:version]) | |
| parts[:rscc] = URI.unescape(options[:cache_control]) unless options[:cache_control] == '' | |
| parts[:rscd] = URI.unescape(options[:content_disposition]) unless options[:content_disposition] == '' | |
| parts[:rsce] = URI.unescape(options[:content_encoding]) unless options[:content_encoding] == '' | |
| parts[:rscl] = URI.unescape(options[:content_language]) unless options[:content_language] == '' | |
| parts[:rsct] = URI.unescape(options[:content_type]) unless options[:content_type] == '' | |
| parts[:sig] = URI.unescape(create_signature(prepared_string(options))) | |
| uri.query_values = parts | |
| return "#{base}/#{options[:path]}?#{uri.query}" | |
| end |
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