Add telegram api

telegram/api/api.go

@@ -0,0 +1,38 @@
+package api
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"time"
+)
+
+const (
+	apiUserAgent   = "mtg"
+	apiHTTPTimeout = 30 * time.Second
+)
+
+var httpClient = http.Client{
+	Timeout: apiHTTPTimeout,
+}
+
+func request(url string) (io.ReadCloser, error) {
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Set("Accept", "text/plan")
+	req.Header.Set("User-Agent", apiUserAgent)
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		if resp != nil {
+			io.Copy(ioutil.Discard, resp.Body)
+			resp.Body.Close()
+		}
+		return nil, fmt.Errorf("cannot perform a request: %w", err)
+	}
+
+	return resp.Body, err
+}