server

cmd/server/api/responses.go

@@ -0,0 +1,187 @@
+package api
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"time"
+)
+
+type (
+	httpCore struct {
+		Status    int       `json:"status"`
+		Timestamp time.Time `json:"timestamp"`
+		Path      string    `json:"path"`
+	}
+
+	httpError struct {
+		httpCore
+		Error   string `json:"error"`
+		Message string `json:"message"`
+	}
+
+	httpObject struct {
+		httpCore
+		Data any `json:"data"`
+	}
+)
+
+func internalServerError(w http.ResponseWriter, r *http.Request) {
+	e := httpError{
+		httpCore: httpCore{
+			Status:    http.StatusInternalServerError,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Error:   "Internal Server Error",
+		Message: "The server encountered an unexpected condition that prevented it from fulfilling the request.",
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(http.StatusInternalServerError)
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func notFound(message string, w http.ResponseWriter, r *http.Request) {
+	e := httpError{
+		httpCore: httpCore{
+			Status:    http.StatusNotFound,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Error:   "Not Found",
+		Message: message,
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(http.StatusNotFound)
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func methodNotAllowed(w http.ResponseWriter, r *http.Request) {
+	e := httpError{
+		httpCore: httpCore{
+			Status:    http.StatusMethodNotAllowed,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Error:   "Method Not Allowed",
+		Message: "The server knows the request method, but the target resource doesn't support this method",
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(http.StatusMethodNotAllowed)
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func unauthorized(w http.ResponseWriter, r *http.Request) {
+	e := httpError{
+		httpCore: httpCore{
+			Status:    http.StatusUnauthorized,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Error:   "Unauthorized",
+		Message: "The request has not been completed because it lacks valid authentication credentials for the requested resource.",
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.Header().Add("WWW-Authenticate", "Custom realm=\"loginUserHandler via /api/login\"")
+	w.WriteHeader(http.StatusUnauthorized)
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func forbidden(w http.ResponseWriter, r *http.Request) {
+	e := httpError{
+		httpCore: httpCore{
+			Status:    http.StatusForbidden,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Error:   "Forbidden",
+		Message: "The access is permanently forbidden and tied to the application logic, such as insufficient rights to a resource.",
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(http.StatusForbidden)
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func ok(obj interface{}, w http.ResponseWriter, r *http.Request) {
+	e := httpObject{
+		httpCore: httpCore{
+			Status:    http.StatusOK,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Data: obj,
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func badRequest(message string, w http.ResponseWriter, r *http.Request) {
+	e := httpError{
+		httpCore: httpCore{
+			Status:    http.StatusBadRequest,
+			Path:      r.RequestURI,
+			Timestamp: time.Now(),
+		},
+		Error:   "Bad Request",
+		Message: message,
+	}
+
+	payload, err := json.Marshal(e)
+	if err != nil {
+		log.Println(err)
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(http.StatusBadRequest)
+	_, err = w.Write(payload)
+	if err != nil {
+		log.Println(err)
+	}
+}