package pkg import ( "context" "fmt" "github.com/julienschmidt/httprouter" "html/template" "math" "net/http" "strconv" ) type ProductEntry struct { Slug string Name string Price string } type productsIndexPage struct { Products []*ProductEntry } func IndexProducts(w http.ResponseWriter, r *http.Request, _ httprouter.Params) { conn := getConn(r) company := mustGetCompany(r) page := &productsIndexPage{ Products: mustGetProductEntries(r.Context(), conn, company), } mustRenderAppTemplate(w, r, "products/index.gohtml", page) } func GetProductForm(w http.ResponseWriter, r *http.Request, params httprouter.Params) { locale := getLocale(r) conn := getConn(r) company := mustGetCompany(r) form := newProductForm(r.Context(), conn, locale, company) slug := params[0].Value if slug == "new" { w.WriteHeader(http.StatusOK) mustRenderNewProductForm(w, r, form) return } if notFoundErrorOrPanic(conn.QueryRow(r.Context(), "select product.name, product.description, to_price(price, decimal_digits), array_agg(tax_id) from product left join product_tax using (product_id) join company using (company_id) join currency using (currency_code) where product.slug = $1 group by product_id, product.name, product.description, price, decimal_digits", slug).Scan(form.Name, form.Description, form.Price, form.Tax)) { http.NotFound(w, r) return } w.WriteHeader(http.StatusOK) mustRenderEditProductForm(w, r, form) } func mustRenderNewProductForm(w http.ResponseWriter, r *http.Request, form *productForm) { mustRenderAppTemplate(w, r, "products/new.gohtml", form) } func mustRenderEditProductForm(w http.ResponseWriter, r *http.Request, form *productForm) { mustRenderAppTemplate(w, r, "products/edit.gohtml", form) } func HandleAddProduct(w http.ResponseWriter, r *http.Request, _ httprouter.Params) { conn := getConn(r) locale := getLocale(r) company := mustGetCompany(r) form := newProductForm(r.Context(), conn, locale, company) if err := form.Parse(r); err != nil { http.Error(w, err.Error(), http.StatusBadRequest) return } if err := verifyCsrfTokenValid(r); err != nil { http.Error(w, err.Error(), http.StatusForbidden) return } if !form.Validate() { mustRenderNewProductForm(w, r, form) return } taxes := mustSliceAtoi(form.Tax.Selected) conn.MustExec(r.Context(), "select add_product($1, $2, $3, $4, $5)", company.Id, form.Name, form.Description, form.Price, taxes) http.Redirect(w, r, companyURI(company, "/products"), http.StatusSeeOther) } func sliceAtoi(s []string) ([]int, error) { i := []int{} for _, vs := range s { vi, err := strconv.Atoi(vs) if err != nil { return i, err } i = append(i, vi) } return i, nil } func mustSliceAtoi(s []string) []int { i, err := sliceAtoi(s) if err != nil { panic(err) } return i } func HandleUpdateProduct(w http.ResponseWriter, r *http.Request, params httprouter.Params) { conn := getConn(r) locale := getLocale(r) company := mustGetCompany(r) form := newProductForm(r.Context(), conn, locale, company) if err := form.Parse(r); err != nil { http.Error(w, err.Error(), http.StatusBadRequest) return } if err := verifyCsrfTokenValid(r); err != nil { http.Error(w, err.Error(), http.StatusForbidden) return } if !form.Validate() { w.WriteHeader(http.StatusUnprocessableEntity) mustRenderEditProductForm(w, r, form) return } slug := params[0].Value taxes := mustSliceAtoi(form.Tax.Selected) if ok := conn.MustGetBool(r.Context(), "select edit_product($1, $2, $3, $4, $5)", slug, form.Name, form.Description, form.Price, taxes); !ok { http.NotFound(w, r) } http.Redirect(w, r, companyURI(company, "/products/"+slug), http.StatusSeeOther) } func mustGetProductEntries(ctx context.Context, conn *Conn, company *Company) []*ProductEntry { rows, err := conn.Query(ctx, "select product.slug, product.name, to_price(price, decimal_digits) from product join company using (company_id) join currency using (currency_code) where company_id = $1 order by name", company.Id) if err != nil { panic(err) } defer rows.Close() var entries []*ProductEntry for rows.Next() { entry := &ProductEntry{} err = rows.Scan(&entry.Slug, &entry.Name, &entry.Price) if err != nil { panic(err) } entries = append(entries, entry) } if rows.Err() != nil { panic(rows.Err()) } return entries } type productForm struct { locale *Locale company *Company Name *InputField Description *InputField Price *InputField Tax *SelectField } func newProductForm(ctx context.Context, conn *Conn, locale *Locale, company *Company) *productForm { return &productForm{ locale: locale, company: company, Name: &InputField{ Name: "name", Label: pgettext("input", "Name", locale), Type: "text", Required: true, }, Description: &InputField{ Name: "description", Label: pgettext("input", "Description", locale), Type: "textarea", }, Price: &InputField{ Name: "price", Label: pgettext("input", "Price", locale), Type: "number", Required: true, Attributes: []template.HTMLAttr{ `min="0"`, template.HTMLAttr(fmt.Sprintf(`step="%v"`, company.MinCents())), }, }, Tax: &SelectField{ Name: "tax", Label: pgettext("input", "Taxes", locale), Multiple: true, Options: mustGetTaxOptions(ctx, conn, company), }, } } func (form *productForm) Parse(r *http.Request) error { if err := r.ParseForm(); err != nil { return err } form.Name.FillValue(r) form.Description.FillValue(r) form.Price.FillValue(r) form.Tax.FillValue(r) return nil } func (form *productForm) Validate() bool { validator := newFormValidator() validator.CheckRequiredInput(form.Name, gettext("Name can not be empty.", form.locale)) if validator.CheckRequiredInput(form.Price, gettext("Price can not be empty.", form.locale)) { validator.CheckValidDecimal(form.Price, form.company.MinCents(), math.MaxFloat64, gettext("Price must be a number greater than zero.", form.locale)) } validator.CheckValidSelectOption(form.Tax, gettext("Selected tax is not valid.", form.locale)) validator.CheckAtMostOneOfEachGroup(form.Tax, gettext("You can only select a tax of each class.", form.locale)) return validator.AllOK() }