[GITHUB-10139][Fix] Generated Swift code not working for multipart/form-data video upload

Author: aman-v-singh

codegens/swift/lib/swift.js

@@ -111,29 +111,34 @@ function parseFormData (body, mode, trim, indent) {
   parameters = '[\n' + _.join(parameters, ',\n') + ']';
   bodySnippet = `let parameters = ${parameters} as [[String: Any]]\n\n`;
   bodySnippet += 'let boundary = "Boundary-\\(UUID().uuidString)"\n';
-  bodySnippet += 'var body = ""\nvar error: Error? = nil\n';
+  bodySnippet += 'var body = Data()\nvar error: Error? = nil\n';
   bodySnippet += 'for param in parameters {\n';
   bodySnippet += `${indent}if param["disabled"] != nil { continue }\n`;
   bodySnippet += `${indent}let paramName = param["key"]!\n`;
-  bodySnippet += `${indent}body += "--\\(boundary)\\r\\n"\n`;
+  bodySnippet += `${indent}body += Data("--\\(boundary)\\r\\n".utf8)\n`;
   // eslint-disable-next-line no-useless-escape
-  bodySnippet += `${indent}body += "Content-Disposition:form-data; name=\\"\\(paramName)\\"\"\n`;
+  bodySnippet += `${indent}body += Data("Content-Disposition:form-data; name=\\"\\(paramName)\\"\".utf8)\n`;
   bodySnippet += `${indent}if param["contentType"] != nil {\n`;
-  bodySnippet += `${indent.repeat(2)}body += "\\r\\nContent-Type: \\(param["contentType"] as! String)"\n`;
+  bodySnippet += `${indent.repeat(2)}body += Data("\\r\\nContent-Type: \\(param["contentType"] as! String)".utf8)\n`;
   bodySnippet += `${indent}}\n`;
   bodySnippet += `${indent}let paramType = param["type"] as! String\n`;
   bodySnippet += `${indent}if paramType == "text" {\n`;
   bodySnippet += `${indent.repeat(2)}let paramValue = param["value"] as! String\n`;
-  bodySnippet += `${indent.repeat(2)}body += "\\r\\n\\r\\n\\(paramValue)\\r\\n"\n`;
+  bodySnippet += `${indent.repeat(2)}body += Data("\\r\\n\\r\\n\\(paramValue)\\r\\n".utf8)\n`;
   bodySnippet += `${indent}} else {\n`;
   bodySnippet += `${indent.repeat(2)}let paramSrc = param["src"] as! String\n`;
-  bodySnippet += `${indent.repeat(2)}let fileData = try NSData(contentsOfFile: paramSrc, options: []) as Data\n`;
-  bodySnippet += `${indent.repeat(2)}let fileContent = String(data: fileData, encoding: .utf8)!\n`;
-  bodySnippet += `${indent.repeat(2)}body += "; filename=\\"\\(paramSrc)\\"\\r\\n"\n`;
-  bodySnippet += `${indent.repeat(2)}  + "Content-Type: \\"content-type header\\"\\r\\n\\r\\n`;
-  bodySnippet += '\\(fileContent)\\r\\n"\n';
-  bodySnippet += `${indent}}\n}\nbody += "--\\(boundary)--\\r\\n";\n`;
-  bodySnippet += 'let postData = body.data(using: .utf8)';
+  bodySnippet += `${indent.repeat(2)}let fileURL = URL(fileURLWithPath: paramSrc)\n`;
+  bodySnippet += `${indent.repeat(2)}if let fileContent = try? Data(contentsOf: fileURL) {`;
+  bodySnippet += `${indent.repeat(3)}body += ("; filename=\\"\\(paramSrc)\\"\\r\\n".utf8)\n`;
+  bodySnippet += `${indent.repeat(3)}body += Data("Content-Type: \\"content-type header\\"\\r\\n".utf8)\n`;
+  bodySnippet += `${indent.repeat(3)}body += Data("\\r\\n".utf8)\n`;
+  bodySnippet += `${indent.repeat(3)}body += fileContent\n`;
+  bodySnippet += `${indent.repeat(3)}body += Data("\\r\\n".utf8)\n`;
+  bodySnippet += `${indent.repeat(2)}}\n`;
+  bodySnippet += `${indent}}\n`;
+  bodySnippet += '}\n';
+  bodySnippet += 'body += Data("--\\(boundary)--\\r\\n".utf8);\n';
+  bodySnippet += 'let postData = body\n';
   return bodySnippet;
 }