requests.go

package telegraph

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"strings"
)

type Body struct {
	// Ok: if true, request was successful, and result can be found in the Result field.
	// If false, error can be explained in Error field.
	Ok bool `json:"ok"`
	// Error: contains a human-readable description of the error result.
	Error string `json:"error"`
	// Result: result of requests (if Ok)
	Result json.RawMessage `json:"result"`
}

func (c *TelegraphClient) InvokeRequest(method string, params url.Values) (json.RawMessage, error) {
	r, err := http.NewRequest(http.MethodPost, c.ApiUrl+method, strings.NewReader(params.Encode()))
	if err != nil {
		return nil, fmt.Errorf("failed to build POST request to %s: %w", method, err)
	}

	resp, err := c.HttpClient.Do(r)
	if err != nil {
		return nil, fmt.Errorf("failed to execute POST request to %s: %w", method, err)
	}

	defer func() {
		_ = resp.Body.Close()
	}()

	var b Body
	if err = json.NewDecoder(resp.Body).Decode(&b); err != nil {
		return nil, fmt.Errorf("failed to parse response from %s: %w", method, err)
	}
	if !b.Ok {
		return nil, fmt.Errorf("failed to %s: %s", method, b.Error)
	}
	return b.Result, nil
}