metrics: add initial Prometheus support (#4141)

pkg/context/auth.go

@@ -5,13 +5,16 @@
 package context
 
 import (
+	"net/http"
 	"net/url"
+	"strings"
 
 	"github.com/go-macaron/csrf"
 	"gopkg.in/macaron.v1"
 
 	"github.com/gogs/gogs/pkg/auth"
 	"github.com/gogs/gogs/pkg/setting"
+	"github.com/gogs/gogs/pkg/tool"
 )
 
 type ToggleOptions struct {
@@ -92,3 +95,18 @@ func Toggle(options *ToggleOptions) macaron.Handler {
 		}
 	}
 }
+
+// RequireBasicAuth verifies HTTP Basic Authentication header with given credentials
+func (c *Context) RequireBasicAuth(username, password string) {
+	fields := strings.Fields(c.Req.Header.Get("Authorization"))
+	if len(fields) != 2 || fields[0] != "Basic" {
+		c.Status(http.StatusUnauthorized)
+		return
+	}
+
+	uname, passwd, _ := tool.BasicAuthDecode(fields[1])
+	if uname != username || passwd != password {
+		c.Status(http.StatusForbidden)
+		return
+	}
+}