Add support for `skip_verify` in drone-webhook

DOCS.md

@@ -1,10 +1,12 @@
 Use the Webhook plugin to notify services via Webhook when a build completes.
-You will need to supply Drone with outgoing Webhook URLs. You can override the
+You will need to supply Drone with outgoing Webhook URLs.
-default configuration with the following parameters:
+
+You can override the default configuration with the following parameters:
 
 * `urls` - JSON payloads are sent to each URL
 * `method` - HTTP request method. Defaults to `POST`
 * `header` - HTTP request header map
+* `skip_verify` - Skip verification of TLS certificates, defaults to `false`
 
 ## Example
 
@@ -23,10 +25,10 @@ notify:
 ### Custom Body
 
 In some cases you may want to submit a custom payload in the body of your hook.
-For the use case we expose the following additional parameters:
+For this usage the following additional parameters should be used:
 
 * `template` - Handlebars template to create a custom payload body. See [docs](http://handlebarsjs.com/)
-* `content_type` - HTTP request content type
+* `content_type` - HTTP request content type, defaults to `application/json`
 
 Example configuration that generate a custom Yaml payload:
 

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"crypto/tls"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -108,7 +109,15 @@ func main() {
 			req.SetBasicAuth(vargs.Auth.Username, vargs.Auth.Password)
 		}
 
-		resp, err := http.DefaultClient.Do(req)
+		client := http.DefaultClient
+		if vargs.SkipVerify {
+			client = &http.Client{
+				Transport: &http.Transport{
+					TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+				},
+			}
+		}
+		resp, err := client.Do(req)
 
 		if err != nil {
 			fmt.Printf("Error: Failed to execute the HTTP request. %s\n", err)

types.go

@@ -3,6 +3,7 @@ package main
 // Params represents the valid paramenter options for the webhook plugin.
 type Params struct {
 	URLs        []string          `json:"urls"`
+	SkipVerify  bool              `json:"skip_verify"`
 	Debug       bool              `json:"debug"`
 	Auth        Auth              `json:"auth"`
 	Headers     map[string]string `json:"header"`