Add CPONE lab and radiology result forwarding

internal/http/update_result_forward.go

@@ -0,0 +1,73 @@
+package http
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"mime"
+	"net/http"
+	"time"
+)
+
+const maxUpdateResultBody = 8 << 20
+
+type resultHTTPClient interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+type updateResultForwarder struct {
+	targetURL string
+	client    resultHTTPClient
+}
+
+// NewUpdateResultForwarder relays the original JSON body to CPONE without
+// forwarding the caller's Authorization header or cookies.
+func NewUpdateResultForwarder(targetURL string, client resultHTTPClient) http.Handler {
+	if client == nil {
+		client = &http.Client{Timeout: 30 * time.Second}
+	}
+	return updateResultForwarder{
+		targetURL: targetURL,
+		client:    client,
+	}
+}
+
+func (h updateResultForwarder) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	mediaType, _, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
+	if err != nil || mediaType != "application/json" {
+		WriteJSON(w, http.StatusUnsupportedMediaType, Response{Success: false, Message: "Content-Type harus application/json"})
+		return
+	}
+	body, err := io.ReadAll(io.LimitReader(r.Body, maxUpdateResultBody+1))
+	if err != nil {
+		WriteJSON(w, http.StatusBadRequest, Response{Success: false, Message: "Gagal membaca payload hasil pemeriksaan"})
+		return
+	}
+	if len(body) > maxUpdateResultBody {
+		WriteJSON(w, http.StatusRequestEntityTooLarge, Response{Success: false, Message: "Payload hasil pemeriksaan terlalu besar"})
+		return
+	}
+	var payload map[string]json.RawMessage
+	if err := json.Unmarshal(body, &payload); err != nil || payload == nil {
+		WriteJSON(w, http.StatusBadRequest, Response{Success: false, Message: "Payload harus berupa object JSON"})
+		return
+	}
+	upstreamRequest, err := http.NewRequestWithContext(r.Context(), http.MethodPost, h.targetURL, bytes.NewReader(body))
+	if err != nil {
+		WriteJSON(w, http.StatusBadGateway, Response{Success: false, Message: "URL tujuan CPONE tidak valid"})
+		return
+	}
+	upstreamRequest.Header.Set("Content-Type", "application/json")
+	upstreamRequest.Header.Set("Accept", "application/json")
+	upstreamResponse, err := h.client.Do(upstreamRequest)
+	if err != nil {
+		WriteJSON(w, http.StatusBadGateway, Response{Success: false, Message: "Gagal menghubungi API hasil pemeriksaan CPONE"})
+		return
+	}
+	defer upstreamResponse.Body.Close()
+	if contentType := upstreamResponse.Header.Get("Content-Type"); contentType != "" {
+		w.Header().Set("Content-Type", contentType)
+	}
+	w.WriteHeader(upstreamResponse.StatusCode)
+	_, _ = io.Copy(w, upstreamResponse.Body)
+}