feat: initial commit

cmd/api/json.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+	"unicode"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var Validate *validator.Validate
+
+func init() {
+	Validate = validator.New(validator.WithRequiredStructEnabled())
+	Validate.RegisterValidation("password", validatePassword)
+}
+
+func writeJSON(w http.ResponseWriter, status int, data any) error {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	return json.NewEncoder(w).Encode(data)
+}
+
+func readJSON(w http.ResponseWriter, r *http.Request, data any) error {
+	maxBytes := 1_048_578 // 1MB
+	r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes))
+
+	decoder := json.NewDecoder(r.Body)
+	decoder.DisallowUnknownFields()
+
+	return decoder.Decode(data)
+}
+
+func errorJSON(w http.ResponseWriter, status int, err string) error {
+	type envelope struct {
+		Error string `json:"error"`
+	}
+
+	return writeJSON(w, status, &envelope{Error: err})
+}
+
+func (api *api) jsonResponse(w http.ResponseWriter, status int, data any) error {
+	type envelope struct {
+		Data any `json:"data"`
+	}
+	return writeJSON(w, status, &envelope{Data: data})
+}
+
+func validatePassword(fl validator.FieldLevel) bool {
+	password := fl.Field().String()
+
+	var (
+		hasMinLen = len(password) >= 8
+		hasMaxLen = len(password) <= 72
+		hasUpper  = false
+		hasLower  = false
+		hasNumber = false
+		hasSymbol = false
+	)
+
+	for _, char := range password {
+		switch {
+		case unicode.IsUpper(char):
+			hasUpper = true
+		case unicode.IsLower(char):
+			hasLower = true
+		case unicode.IsNumber(char):
+			hasNumber = true
+		case unicode.IsPunct(char) || unicode.IsSymbol(char):
+			hasSymbol = true
+		}
+	}
+
+	return hasMinLen && hasMaxLen && hasUpper && hasLower && hasNumber && hasSymbol
+}