Matrix/request.go

package main

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"mime/multipart"

	"github.com/go-resty/resty/v2"
)

func createInsructions(marshal []byte) (*bytes.Buffer, string, error) {
	// Create a new form data object
	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)

	// Add the "instructions" key with the value of marshal
	part, err := writer.CreateFormField("instructions")
	if err != nil {
		return nil, "", err
	}
	part.Write(marshal)

	// Close the multipart writer
	writer.Close()

	return body, writer.FormDataContentType(), nil
}

func sendRequest(client *resty.Client, url string, ins []interface{}) error {
	// Manually marshal instructions
	marshal, err := json.Marshal(ins)
	if err != nil {
		return err
	}

	// Create instructions form data
	req, content, err := createInsructions(marshal)
	if err != nil {
		return err
	}

	// Build and send request
	res, err := client.R().
		SetHeader("Content-Type", content).
		SetBody(req.Bytes()).
		Post(fmt.Sprintf("%s/instructions", url))

	// Error handling
	if err != nil {
		return err
	}

	// Unmarshal response
	var data Response
	err = json.Unmarshal(res.Body(), &data)
	if err != nil {
		return err
	}

	// Print response
	if !data.Success {
		return errors.New("Remote server responded unsuccessfully!")
	}

	return nil
}