adds integrations with bookish-server, the books API and the google books API, adds functionality for library, searching for books, and displaying renters registered in the system

bookish-server/cmd/http/middleware.go

@@ -13,6 +13,23 @@ import (
 	"github.com/go-chi/chi"
 )
 
+// cors is a middlware that adds CORS headers to responses.
+func cors(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
+		w.Header().Set("Access-Control-Allow_Headers", "Origin, Content-Type, Accept, Authorization")
+		w.Header().Set("Access-Control-Allow-Credentials", "true")
+		w.Header().Set("Access-Control-Max-Age", "600")
+
+		if r.Method == "OPTIONS" {
+			return
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}
+
 // renterCtx is a convenience handler to fetch the renter with the provided renterId URLParam.
 func (s *Server) renterCtx(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {