Move and refactor files and some more changes :3

utils/http.go

@@ -0,0 +1,51 @@
+package utils
+
+import (
+	"net/http"
+	"net/url"
+	"time"
+)
+
+type headerRoundTripper struct {
+	http.RoundTripper
+	header map[string]string
+}
+
+func (rht headerRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
+	resp, err := rht.RoundTripper.RoundTrip(r)
+	if err != nil {
+		return nil, err
+	}
+	for k, v := range rht.header {
+		resp.Header.Set(k, v)
+	}
+	return resp, nil
+}
+
+func CreateOrDefaultClient(proxy, useragent string) (*http.Client, error) {
+	if proxy == "" {
+		return http.DefaultClient, nil
+	} else {
+		proxyURL, err := url.Parse(proxy)
+		if err != nil {
+			return nil, err
+		}
+
+		var rt http.RoundTripper = &http.Transport{
+			DisableCompression: true,
+			Proxy:              http.ProxyURL(proxyURL),
+		}
+		if useragent != "" {
+			rt = headerRoundTripper{
+				RoundTripper: rt,
+				header:       map[string]string{"User-Agent": useragent},
+			}
+		}
+
+		client := &http.Client{
+			Transport: rt,
+			Timeout:   30 * time.Second,
+		}
+		return client, nil
+	}
+}