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package validation_test |
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import ( |
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"context" |
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"encoding/json" |
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"fmt" |
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"log" |
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"net/http" |
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"net/http/httptest" |
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"strings" |
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"github.com/muonsoft/language" |
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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/it" |
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"github.com/muonsoft/validation/message/translations/russian" |
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) |
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type Book struct { |
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Title string `json:"title"` |
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Author string `json:"author"` |
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Keywords []string `json:"keywords"` |
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} |
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func (b Book) Validate(ctx context.Context, validator *validation.Validator) error { |
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return validator.Validate( |
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ctx, |
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validation.StringProperty("title", b.Title, it.IsNotBlank()), |
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validation.StringProperty("author", b.Author, it.IsNotBlank()), |
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validation.CountableProperty("keywords", len(b.Keywords), it.HasCountBetween(1, 10)), |
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validation.EachStringProperty("keywords", b.Keywords, it.IsNotBlank()), |
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) |
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} |
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func HandleBooks(writer http.ResponseWriter, request *http.Request) { |
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var book Book |
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err := json.NewDecoder(request.Body).Decode(&book) |
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if err != nil { |
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http.Error(writer, "invalid request", http.StatusBadRequest) |
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return |
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} |
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// setting up validator |
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validator, err := validation.NewValidator(validation.Translations(russian.Messages)) |
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if err != nil { |
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http.Error(writer, err.Error(), http.StatusInternalServerError) |
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return |
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} |
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err = validator.Validate(request.Context(), validation.Valid(book)) |
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if err != nil { |
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violations, ok := validation.UnwrapViolationList(err) |
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if ok { |
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response, err := json.Marshal(violations) |
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if err != nil { |
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log.Fatal(err) |
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} |
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writer.WriteHeader(http.StatusUnprocessableEntity) |
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writer.Header().Set("Content-Type", "application/json") |
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writer.Write(response) |
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return |
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} |
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http.Error(writer, err.Error(), http.StatusInternalServerError) |
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return |
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} |
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// handle valid book |
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writer.WriteHeader(http.StatusCreated) |
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writer.Write([]byte("ok")) |
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} |
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func ExampleValidator_Validate_httpHandler() { |
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var handler http.Handler |
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handler = http.HandlerFunc(HandleBooks) |
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// middleware set up: we need to set supported languages |
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// detected language will be passed via request context |
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handler = language.NewMiddleware(handler, language.SupportedLanguages(language.English, language.Russian)) |
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// creating request with the language-specific header |
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request := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(`{}`)) |
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request.Header.Set("Accept-Language", "ru") |
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recorder := httptest.NewRecorder() |
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handler.ServeHTTP(recorder, request) |
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// recorded response should contain array of violations |
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fmt.Println(recorder.Body.String()) |
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// Output: |
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// [{"error":"is blank","message":"Значение не должно быть пустым.","propertyPath":"title"},{"error":"is blank","message":"Значение не должно быть пустым.","propertyPath":"author"},{"error":"too few elements","message":"Эта коллекция должна содержать 1 элемент или больше.","propertyPath":"keywords"}] |
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} |
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muonsoft /
validation
