From a22f3e5a71159a1d0b3fbd3163d5154d0e92b5f8 Mon Sep 17 00:00:00 2001 From: dylan Date: Sat, 28 Dec 2024 17:13:22 +0100 Subject: [PATCH] Write logic for createElection validation --- cmd/web/handlers.go | 35 ++++++- cmd/web/helpers.go | 65 ++++++++++-- cmd/web/main.go | 2 +- cmd/web/openapi.yml | 6 +- go.sum | 170 ++++++++++++++++++++++++++++++++ internal/generated.go | 19 ++-- internal/validator/validator.go | 65 ++++++++++++ 7 files changed, 338 insertions(+), 24 deletions(-) create mode 100644 internal/validator/validator.go diff --git a/cmd/web/handlers.go b/cmd/web/handlers.go index 217fac1..9aaba96 100644 --- a/cmd/web/handlers.go +++ b/cmd/web/handlers.go @@ -1,7 +1,40 @@ package main -import "net/http" +import ( + api "code.dlmw.ch/dlmw/qv/internal" + "code.dlmw.ch/dlmw/qv/internal/validator" + "net/http" + "time" +) + +type createElectionRequestWithValidator struct { + api.CreateElectionRequest + validator.Validator +} func (app *application) createElection(w http.ResponseWriter, r *http.Request) { + var request createElectionRequestWithValidator + err := app.decodePostForm(r, &request) + if err != nil { + app.clientError(w, http.StatusBadRequest, err.Error()) + return + } + + request.CheckField(validator.NotBlank(request.Name), "name", "must not be blank") + request.CheckField(validator.GreaterThan(request.Tokens, 0), "tokens", "must be greater than 0") + request.CheckField(validator.After(request.ExpiresAt, time.Now()), "expiresAt", "must expire in a future date") + request.CheckField(validator.GreaterThan(len(request.Choices), 1), "choices", "there must be more than 1 choice") + + request.CheckField( + !request.IsAnonymous || (request.IsAnonymous && *request.MaxVoters > 0), + "maxVoters", + "must be greater than 0 for anonymous elections", + ) + + if !request.Valid() { + app.unprocessableEntityError(w, request.Validator) + return + } + w.Write([]byte("TODO")) } diff --git a/cmd/web/helpers.go b/cmd/web/helpers.go index 59cfdeb..70b7c8a 100644 --- a/cmd/web/helpers.go +++ b/cmd/web/helpers.go @@ -1,12 +1,63 @@ package main -import "net/http" +import ( + api "code.dlmw.ch/dlmw/qv/internal" + "code.dlmw.ch/dlmw/qv/internal/validator" + "encoding/json" + "errors" + "github.com/go-playground/form/v4" + "net/http" +) func (app *application) serverError(w http.ResponseWriter, r *http.Request, err error) { - var ( - method = r.Method - uri = r.URL.RequestURI() - ) - app.logger.Error(err.Error(), "method", method, "uri", uri) - http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError) + w.WriteHeader(http.StatusInternalServerError) + var response = api.ErrorResponse{ + Code: http.StatusInternalServerError, + Details: nil, + Message: "There was an error in the request", + } + json.NewEncoder(w).Encode(response) +} + +func (app *application) clientError(w http.ResponseWriter, status int, message string) { + w.WriteHeader(status) + var response = api.ErrorResponse{ + Code: http.StatusUnprocessableEntity, + Details: &map[string]interface{}{ + "error": message, + }, + Message: "There was an error in the request", + } + json.NewEncoder(w).Encode(response) +} + +func (app *application) unprocessableEntityError(w http.ResponseWriter, v validator.Validator) { + w.WriteHeader(http.StatusUnprocessableEntity) + var response = api.ErrorResponse{ + Code: http.StatusUnprocessableEntity, + Details: &map[string]interface{}{ + "fields": v.FieldErrors, + }, + Message: "Election data is invalid", + } + json.NewEncoder(w).Encode(response) +} + +func (app *application) decodePostForm(r *http.Request, dst any) error { + err := r.ParseForm() + if err != nil { + return err + } + + err = app.formDecoder.Decode(dst, r.PostForm) + if err != nil { + var invalidDecoderError *form.InvalidDecoderError + if errors.As(err, &invalidDecoderError) { + panic(err) + } + + return err + } + + return nil } diff --git a/cmd/web/main.go b/cmd/web/main.go index aa0224a..6d441fb 100644 --- a/cmd/web/main.go +++ b/cmd/web/main.go @@ -1,4 +1,4 @@ -//go:generate go run github.com/oapi-codegen/oapi-codegen/v2/cmd/oapi-codegen --config=oapi-codegen.yml openapi.yml +//go:generate oapi-codegen --config=oapi-codegen.yml openapi.yml package main diff --git a/cmd/web/openapi.yml b/cmd/web/openapi.yml index e5d04fe..dbe238a 100644 --- a/cmd/web/openapi.yml +++ b/cmd/web/openapi.yml @@ -34,8 +34,8 @@ paths: responses: 201: description: Election created - 400: - description: Bad request + 422: + description: Unprocessable Content content: application/json: schema: @@ -187,7 +187,7 @@ components: type: string description: Human-readable error message code: - type: string + type: integer description: Machine-readable error code details: type: object diff --git a/go.sum b/go.sum index 142f211..f245be9 100644 --- a/go.sum +++ b/go.sum @@ -1,8 +1,178 @@ +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline 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h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/internal/generated.go b/internal/generated.go index 7f18d89..0cd2266 100644 --- a/internal/generated.go +++ b/internal/generated.go @@ -2,7 +2,7 @@ // Package api provides primitives to interact with the openapi HTTP API. // -// Code generated by github.com/oapi-codegen/oapi-codegen/v2 version v2.4.1 DO NOT EDIT. +// Code generated by github.com/deepmap/oapi-codegen/v2 version v2.2.0 DO NOT EDIT. package api import ( @@ -26,7 +26,7 @@ type CreateElectionRequest struct { // ErrorResponse defines model for ErrorResponse. type ErrorResponse struct { // Code Machine-readable error code - Code string `json:"code"` + Code int `json:"code"` // Details Additional error details when available Details *map[string]interface{} `json:"details"` @@ -56,6 +56,7 @@ type MiddlewareFunc func(http.Handler) http.Handler // CreateElection operation middleware func (siw *ServerInterfaceWrapper) CreateElection(w http.ResponseWriter, r *http.Request) { + ctx := r.Context() handler := http.Handler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { siw.Handler.CreateElection(w, r) @@ -65,7 +66,7 @@ func (siw *ServerInterfaceWrapper) CreateElection(w http.ResponseWriter, r *http handler = middleware(handler) } - handler.ServeHTTP(w, r) + handler.ServeHTTP(w, r.WithContext(ctx)) } type UnescapedCookieParamError struct { @@ -142,27 +143,21 @@ func Handler(si ServerInterface) http.Handler { return HandlerWithOptions(si, StdHTTPServerOptions{}) } -// ServeMux is an abstraction of http.ServeMux. -type ServeMux interface { - HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) - ServeHTTP(w http.ResponseWriter, r *http.Request) -} - type StdHTTPServerOptions struct { BaseURL string - BaseRouter ServeMux + BaseRouter *http.ServeMux Middlewares []MiddlewareFunc ErrorHandlerFunc func(w http.ResponseWriter, r *http.Request, err error) } // HandlerFromMux creates http.Handler with routing matching OpenAPI spec based on the provided mux. -func HandlerFromMux(si ServerInterface, m ServeMux) http.Handler { +func HandlerFromMux(si ServerInterface, m *http.ServeMux) http.Handler { return HandlerWithOptions(si, StdHTTPServerOptions{ BaseRouter: m, }) } -func HandlerFromMuxWithBaseURL(si ServerInterface, m ServeMux, baseURL string) http.Handler { +func HandlerFromMuxWithBaseURL(si ServerInterface, m *http.ServeMux, baseURL string) http.Handler { return HandlerWithOptions(si, StdHTTPServerOptions{ BaseURL: baseURL, BaseRouter: m, diff --git a/internal/validator/validator.go b/internal/validator/validator.go new file mode 100644 index 0000000..170a5d0 --- /dev/null +++ b/internal/validator/validator.go @@ -0,0 +1,65 @@ +package validator + +import ( + "regexp" + "slices" + "strings" + "time" + "unicode/utf8" +) + +type Validator struct { + NonFieldErrors []string + FieldErrors map[string]string +} + +func (v *Validator) Valid() bool { + return len(v.FieldErrors) == 0 && len(v.NonFieldErrors) == 0 +} + +func (v *Validator) AddNonFieldError(message string) { + v.NonFieldErrors = append(v.NonFieldErrors, message) +} + +func (v *Validator) AddFieldError(key, message string) { + if v.FieldErrors == nil { + v.FieldErrors = make(map[string]string) + } + if _, exists := v.FieldErrors[key]; !exists { + v.FieldErrors[key] = message + } +} + +func (v *Validator) CheckField(ok bool, key, message string) { + if !ok { + v.AddFieldError(key, message) + } +} + +func NotBlank(value string) bool { + return strings.TrimSpace(value) != "" +} + +func MinChars(value string, n int) bool { + return utf8.RuneCountInString(value) >= n +} + +func MaxChars(value string, n int) bool { + return utf8.RuneCountInString(value) <= n +} + +func PermittedValue[T comparable](value T, permittedValues ...T) bool { + return slices.Contains(permittedValues, value) +} + +func Matches(value string, rx *regexp.Regexp) bool { + return rx.MatchString(value) +} + +func GreaterThan(value int, n int) bool { + return value > n +} + +func After(value time.Time, n time.Time) bool { + return value.After(n) +}