feat: Add UI/Handler login process

It adds the whole workflow to store and handle login on both UI and
handler level. With that the login information should be available at
any point given the context.

4 files changed, 89 insertions, 19 deletions

diff --git a/pkg/handler/about/handler.go b/pkg/handler/about/handler.go
index ac3d314..ee084cd 100644
--- a/pkg/handler/about/handler.go
+++ b/pkg/handler/about/handler.go
@@ -26,7 +26,7 @@ func NewAboutHandler(configRepo configurationRepository) *AboutHandler {
 	return &AboutHandler{configRepo.GetRootReadme()}
 }
 
-func (g *AboutHandler) About(w http.ResponseWriter, _ *http.Request) error {
+func (g *AboutHandler) About(w http.ResponseWriter, r *http.Request) error {
 	f, err := os.Open(g.readmePath)
 	if err != nil {
 		return err
@@ -50,6 +50,6 @@ func (g *AboutHandler) About(w http.ResponseWriter, _ *http.Request) error {
 	gitList := &templates.AboutPage{
 		Body: bs,
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
diff --git a/pkg/handler/auth/login.go b/pkg/handler/auth/login.go
index 7e77a67..7014548 100644
--- a/pkg/handler/auth/login.go
+++ b/pkg/handler/auth/login.go
@@ -1,20 +1,87 @@
 package auth
 
 import (
+	"encoding/base64"
 	"net/http"
+	"time"
 
 	"git.gabrielgio.me/cerrado/pkg/ext"
 	"git.gabrielgio.me/cerrado/templates"
 )
 
 type (
-	LoginHandler struct{}
+	LoginHandler struct {
+		auth authService
+	}
+
+	authService interface {
+		CheckAuth(username, password string) bool
+		IssueToken() ([]byte, error)
+	}
 )
 
+func NewLoginHandler(auth authService) *LoginHandler {
+	return &LoginHandler{
+		auth: auth,
+	}
+}
+
+func (g *LoginHandler) Logout(w http.ResponseWriter, r *http.Request) error {
+	cookie := &http.Cookie{
+		Name:    "auth",
+		Value:   "",
+		Path:    "/",
+		Expires: time.Unix(0, 0),
+	}
+
+	referer := r.Header.Get("Referer")
+	if referer == "" {
+		referer = "/"
+	}
+
+	http.SetCookie(w, cookie)
+	ext.Redirect(w, referer)
+	return nil
+}
+
 func (g *LoginHandler) Login(w http.ResponseWriter, r *http.Request) error {
-	ext.SetHTML(w)
+	if r.Method == "GET" {
+		ext.SetHTML(w)
+
+		login := &templates.LoginPage{}
+		templates.WritePageTemplate(w, login, r.Context())
+	} else if r.Method == "POST" {
+
+		username := r.FormValue("username")
+		password := r.FormValue("password")
+
+		if !g.auth.CheckAuth(username, password) {
+			login := &templates.LoginPage{
+				ErrorMessage: "Invalid login",
+			}
+			templates.WritePageTemplate(w, login, r.Context())
+		} else {
+
+			bytes, err := g.auth.IssueToken()
+			if err != nil {
+				return err
+			}
+
+			cookie := &http.Cookie{
+				Name:     "auth",
+				Value:    base64.StdEncoding.EncodeToString(bytes),
+				Path:     "/",
+				MaxAge:   3600,
+				HttpOnly: true,
+				Secure:   true,
+				SameSite: http.SameSiteStrictMode,
+			}
+
+			http.SetCookie(w, cookie)
+			ext.Redirect(w, "/")
+		}
+
+	}
 
-	login := &templates.LoginPage{}
-	templates.WritePageTemplate(w, login)
 	return nil
 }
diff --git a/pkg/handler/git/handler.go b/pkg/handler/git/handler.go
index 5739c8e..4276159 100644
--- a/pkg/handler/git/handler.go
+++ b/pkg/handler/git/handler.go
@@ -43,7 +43,7 @@ func NewGitHandler(gitService *service.GitService, confRepo configurationReposit
 	}
 }
 
-func (g *GitHandler) List(w http.ResponseWriter, _ *http.Request) error {
+func (g *GitHandler) List(w http.ResponseWriter, r *http.Request) error {
 	repos, err := g.gitService.ListRepositories()
 	if err != nil {
 		return err
@@ -73,7 +73,7 @@ func (g *GitHandler) List(w http.ResponseWriter, _ *http.Request) error {
 		Respositories: repos,
 		About:         bs,
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -85,7 +85,7 @@ func (g *GitHandler) Archive(w http.ResponseWriter, r *http.Request) error {
 
 	// TODO: remove it once we can support more than gzip
 	if !strings.HasSuffix(file, ".tar.gz") {
-		ext.NotFound(w)
+		ext.NotFound(w, r)
 		return nil
 	}
 
@@ -135,7 +135,7 @@ func (g *GitHandler) Summary(w http.ResponseWriter, r *http.Request) error {
 			Commits:  commits,
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -155,7 +155,7 @@ func (g *GitHandler) About(w http.ResponseWriter, r *http.Request) error {
 			GitItemBase: &templates.GitItemAboutPage{
 				About: []byte("About file not configured properly"),
 			},
-		})
+		}, r.Context())
 		return nil
 	}
 	if err != nil {
@@ -179,7 +179,7 @@ func (g *GitHandler) About(w http.ResponseWriter, r *http.Request) error {
 			About: bs,
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -210,7 +210,7 @@ func (g *GitHandler) Refs(w http.ResponseWriter, r *http.Request) error {
 			Branches: branches,
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -239,7 +239,7 @@ func (g *GitHandler) Tree(w http.ResponseWriter, r *http.Request) error {
 			Tree: tree,
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -270,7 +270,7 @@ func (g *GitHandler) Blob(w http.ResponseWriter, r *http.Request) error {
 				Content: []byte("Binary file"),
 			},
 		}
-		templates.WritePageTemplate(w, gitList)
+		templates.WritePageTemplate(w, gitList, r.Context())
 		return nil
 	}
 
@@ -307,7 +307,7 @@ func (g *GitHandler) Blob(w http.ResponseWriter, r *http.Request) error {
 			Content: code.Bytes(),
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -328,7 +328,7 @@ func (g *GitHandler) Log(w http.ResponseWriter, r *http.Request) error {
 			Commits: commits,
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
@@ -355,7 +355,7 @@ func (g *GitHandler) Commit(w http.ResponseWriter, r *http.Request) error {
 			Diff:   diff,
 		},
 	}
-	templates.WritePageTemplate(w, gitList)
+	templates.WritePageTemplate(w, gitList, r.Context())
 	return nil
 }
 
diff --git a/pkg/handler/router.go b/pkg/handler/router.go
index 32bd78a..ee4081b 100644
--- a/pkg/handler/router.go
+++ b/pkg/handler/router.go
@@ -17,12 +17,13 @@ import (
 // its sub package don't leak in other places.
 func MountHandler(
 	gitService *service.GitService,
+	authService *service.AuthService,
 	configRepo *serverconfig.ConfigurationRepository,
 ) (http.Handler, error) {
 	var (
 		gitHandler   = git.NewGitHandler(gitService, configRepo)
 		aboutHandler = about.NewAboutHandler(configRepo)
-		loginHandler = &auth.LoginHandler{}
+		loginHandler = auth.NewLoginHandler(authService)
 	)
 
 	staticHandler, err := static.ServeStaticHandler()
@@ -32,10 +33,12 @@ func MountHandler(
 
 	mux := ext.NewRouter()
 	mux.AddMiddleware(ext.Compress)
+	mux.AddMiddleware(ext.Authenticate(authService))
 	mux.AddMiddleware(ext.Log)
 
 	mux.HandleFunc("/static/{file}", staticHandler)
 	mux.HandleFunc("/login/{$}", loginHandler.Login)
+	mux.HandleFunc("/logout/{$}", loginHandler.Logout)
 	mux.HandleFunc("/{name}/about/{$}", gitHandler.About)
 	mux.HandleFunc("/{name}/", gitHandler.Summary)
 	mux.HandleFunc("/{name}/refs/{$}", gitHandler.Refs)