Added GitHub service with license command

service_github.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+
+	"golang.org/x/net/context"
+	"golang.org/x/net/context/ctxhttp"
+)
+
+func init() {
+	registerServiceHandler("github", githubServiceHandler{})
+}
+
+type githubServiceHandler struct{}
+
+func (g githubServiceHandler) GetDocumentation() serviceHandlerDocumentationList {
+	return serviceHandlerDocumentationList{
+		{
+			ServiceName: "GitHub repo license",
+			DemoPath:    "/github/license/Luzifer/badge-gen",
+			Arguments:   []string{"license", "<user>", "<repo>"},
+		},
+	}
+}
+
+func (g githubServiceHandler) Handle(ctx context.Context, params []string) (title, text, color string, err error) {
+	if len(params) < 2 {
+		err = errors.New("No service-command / parameters were given")
+		return
+	}
+
+	switch params[0] {
+	case "license":
+		title, text, color, err = g.handleLicense(ctx, params[1:])
+	default:
+		err = errors.New("An unknown service command was called")
+	}
+
+	return
+}
+
+func (g githubServiceHandler) handleLicense(ctx context.Context, params []string) (title, text, color string, err error) {
+	path := strings.Join([]string{"repos", params[0], params[1], "license"}, "/")
+
+	req, _ := http.NewRequest("GET", "https://api.github.com/"+path, nil)
+	req.Header.Set("Accept", "application/vnd.github.drax-preview+json")
+
+	var resp *http.Response
+	resp, err = ctxhttp.Do(ctx, http.DefaultClient, req)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	r := struct {
+		License struct {
+			Name string `json:"name"`
+		} `json:"license"`
+	}{}
+	if err = json.NewDecoder(resp.Body).Decode(&r); err != nil {
+		return
+	}
+
+	title = "license"
+	text = r.License.Name
+	color = "007ec6"
+
+	if text == "" {
+		text = "None"
+	}
+
+	return
+}