initial commit for bookish-server and local environment

bookish-server/cmd/http/middleware.go

@@ -0,0 +1,73 @@
+package http
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"net/http"
+	"strconv"
+
+	"github.com/davidlick/bookish/bookish-server/internal"
+	"github.com/davidlick/bookish/bookish-server/mysql"
+	"github.com/go-chi/chi"
+)
+
+// 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) {
+		ctx := r.Context()
+		id := chi.URLParam(r, "renterId")
+
+		renterId, err := strconv.Atoi(id)
+		if err != nil {
+			http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
+			return
+		}
+
+		renter, err := s.Renter.FetchRenter(renterId)
+		if err != nil && errors.Is(mysql.ErrNotFound, err) {
+			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+			return
+		} else if err != nil {
+			http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+			return
+		}
+
+		ctx = context.WithValue(ctx, internal.CtxRenter, renter)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+// bookInLibrary is a convenience handler that queries the books API for a map of books available
+// at the library.
+func (s *Server) bookInLibrary(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		s.UpdateMap()
+
+		reqBytes, err := ioutil.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
+			return
+		}
+
+		var req struct {
+			Title string `json:"title"`
+		}
+
+		err = json.Unmarshal(reqBytes, &req)
+		if err != nil {
+			http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
+			return
+		}
+
+		if _, found := s.LibraryMap.Map[req.Title]; !found {
+			http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
+			return
+		}
+
+		ctx = context.WithValue(ctx, internal.CtxBookTitle, req.Title)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}