Add option to skip verification of ssl certificates

Some environments uses internal certificates and some IOT devices have limited to no root certificates
causing verification of ssl certificates to become problematic.

README.md

@@ -204,6 +204,7 @@ By default, GoDNS uses `JSON` config file. However, you can specify to use the `
 - `interval` — How often (in seconds) the public IP should be updated.
 - `socks5_proxy` — Socks5 proxy server.
 - `resolver` — Address of a public DNS server to use. For instance to use [Google's public DNS](https://developers.google.com/speed/public-dns/docs/using), you can set `8.8.8.8` when using GoDNS in IPv4 mode or `2001:4860:4860::8888` in IPv6 mode.
+- `skip_ssl_verify` - Skip verification of ssl certificates for https requests.
 
 ### Update root domain
 

configs/config_sample.json

@@ -32,6 +32,7 @@
   "use_proxy": false,
   "debug_info": false,
   "proxied": false,
+  "skip_ssl_verify": false,
   "notify": {
     "telegram": {
       "enabled": false,

configs/config_sample.yaml

@@ -16,6 +16,7 @@ ip_interface: eth0
 socks5_proxy:
 use_proxy: false
 debug_info: false
+skip_ssl_verify: false
 notify:
   telegram:
     enabled: false

internal/settings/settings.go

@@ -121,6 +121,7 @@ type Settings struct {
 	AppKey         string   `json:"app_key" yaml:"app_key"`
 	AppSecret      string   `json:"app_secret" yaml:"app_secret"`
 	ConsumerKey    string   `json:"comsumer_key" yaml:"comsumer_key"`
+	SkipSSLVerify  bool     `json:"skip_ssl_verify" yaml:"skip_ssl_verify"`
 }
 
 // LoadSettings -- Load settings from config file.

internal/utils/http.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"context"
+	"crypto/tls"
 	"net"
 	"net/http"
 	"time"
@@ -31,9 +32,16 @@ func GetHTTPClient(conf *settings.Settings) *http.Client {
 			return dialer.Dial(network, address)
 		}
 
-		httpTransport := &http.Transport{}
+		httpTransport := &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: conf.SkipSSLVerify},
+		}
 		client.Transport = httpTransport
 		httpTransport.DialContext = dialContext
+	} else {
+		httpTransport := &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: conf.SkipSSLVerify},
+		}
+		client.Transport = httpTransport
 	}
 
 	return client