From a9b61f84070cc7ca0d6e26f187c745619a91422a Mon Sep 17 00:00:00 2001
From: Philipp Tanlak <philipp.tanlak@gmail.com>
Date: Thu, 27 Jul 2023 19:03:41 +0200
Subject: init

---
 api/api.go | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 api/api.go

(limited to 'api/api.go')

diff --git a/api/api.go b/api/api.go
new file mode 100644
index 0000000..893dd00
--- /dev/null
+++ b/api/api.go
@@ -0,0 +1,84 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/alexedwards/flow"
+)
+
+type ScrapeRequest struct {
+	URL  string         `json:"url"`
+	Data map[string]any `json:"data"`
+}
+
+type ScrapeResponse struct {
+	URL  string `json:"url"`
+	Data any    `json:"data"`
+}
+
+//go:generate moq -out api_service_mock_test.go . Service
+type Service interface {
+	ScrapeURL(url string, params map[string]any) (any, error)
+}
+
+func NewHandler(svc Service) http.Handler {
+	h := &Handler{
+		router: flow.New(),
+		svc:    svc,
+	}
+	h.routes()
+	return h
+}
+
+type Handler struct {
+	router *flow.Mux
+	svc    Service
+}
+
+func (h *Handler) routes() {
+	h.router.HandleFunc("/scrape", h.handleScrape, "POST")
+}
+
+func (h *Handler) handleScrape(w http.ResponseWriter, r *http.Request) {
+	var req ScrapeRequest
+	if err := decodeRequest(r, &req); err != nil {
+		respondErr(w, http.StatusBadRequest, err)
+		return
+	}
+
+	result, err := h.svc.ScrapeURL(req.URL, req.Data)
+	if err != nil {
+		respondErr(w, http.StatusInternalServerError, err)
+		return
+	}
+
+	respond(w, ScrapeResponse{
+		URL:  req.URL,
+		Data: result,
+	})
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	h.router.ServeHTTP(w, r)
+}
+
+func decodeRequest(r *http.Request, v any) error {
+	return json.NewDecoder(r.Body).Decode(v)
+}
+
+func respond(w http.ResponseWriter, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(v)
+}
+
+func respondErr(w http.ResponseWriter, statusCode int, err error) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(struct {
+		Error string `json:"error"`
+	}{
+		Error: err.Error(),
+	})
+}
-- 
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