Reorganized server and client internal code

internal/server.go

@@ -0,0 +1,69 @@
+package opaal
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+)
+
+type Server struct {
+	http.Server
+	Host string `yaml:"host"`
+	Port int    `yaml:"port"`
+}
+
+func NewServerWithConfig(config *Config) *Server {
+	host := config.Server.Host
+	port := config.Server.Port
+	server := &Server{
+		Host: host,
+		Port: port,
+	}
+	server.Addr = fmt.Sprintf("%s:%d", host, port)
+	return server
+}
+
+func (s *Server) SetListenAddr(host string, port int) {
+	s.Host = host
+	s.Port = port
+	s.Addr = s.GetListenAddr()
+}
+
+func (s *Server) GetListenAddr() string {
+	return fmt.Sprintf("%s:%d", s.Host, s.Port)
+}
+
+func (s *Server) WaitForAuthorizationCode(loginUrl string) (string, error) {
+	var code string
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		http.Redirect(w, r, "/login", http.StatusSeeOther)
+	})
+	http.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
+		// show login page with notice to redirect
+		loginPage, err := os.ReadFile("pages/index.html")
+		if err != nil {
+			fmt.Printf("failed to load login page: %v\n", err)
+		}
+		loginPage = []byte(strings.ReplaceAll(string(loginPage), "{{loginUrl}}", loginUrl))
+		w.WriteHeader(http.StatusSeeOther)
+		w.Write(loginPage)
+	})
+	http.HandleFunc("/oidc/callback", func(w http.ResponseWriter, r *http.Request) {
+		// get the code from the OIDC provider
+		if r != nil {
+			code = r.URL.Query().Get("code")
+			fmt.Printf("Authorization code: %v\n", code)
+		}
+		http.Redirect(w, r, s.Addr+"/success", http.StatusSeeOther)
+		s.Close()
+	})
+	return code, s.ListenAndServe()
+}
+
+func (s *Server) ShowSuccessPage() error {
+	http.HandleFunc("/success", func(w http.ResponseWriter, r *http.Request) {
+
+	})
+	return s.ListenAndServe()
+}