Add GitLab provider

providers/gitlab.go

@@ -0,0 +1,58 @@
+package providers
+
+import (
+	"log"
+	"net/http"
+	"net/url"
+
+	"github.com/bitly/oauth2_proxy/api"
+)
+
+type GitLabProvider struct {
+	*ProviderData
+}
+
+func NewGitLabProvider(p *ProviderData) *GitLabProvider {
+	p.ProviderName = "GitLab"
+	if p.LoginURL == nil || p.LoginURL.String() == "" {
+		p.LoginURL = &url.URL{
+			Scheme: "https",
+			Host:   "gitlab.com",
+			Path:   "/oauth/authorize",
+		}
+	}
+	if p.RedeemURL == nil || p.RedeemURL.String() == "" {
+		p.RedeemURL = &url.URL{
+			Scheme: "https",
+			Host:   "gitlab.com",
+			Path:   "/oauth/token",
+		}
+	}
+	if p.ValidateURL == nil || p.ValidateURL.String() == "" {
+		p.ValidateURL = &url.URL{
+			Scheme: "https",
+			Host:   "gitlab.com",
+			Path:   "/api/v3/user",
+		}
+	}
+	if p.Scope == "" {
+		p.Scope = "api"
+	}
+	return &GitLabProvider{ProviderData: p}
+}
+
+func (p *GitLabProvider) GetEmailAddress(s *SessionState) (string, error) {
+
+	req, err := http.NewRequest("GET",
+		p.ValidateURL.String()+"?access_token="+s.AccessToken, nil)
+	if err != nil {
+		log.Printf("failed building request %s", err)
+		return "", err
+	}
+	json, err := api.Request(req)
+	if err != nil {
+		log.Printf("failed making request %s", err)
+		return "", err
+	}
+	return json.Get("email").String()
+}