Refactor inline tag edit form into its own file

I was repeating myself a lot for this use case, because each one needed
a different URL and SQL query, however they were kind of structurally
similar and could be refactored into common functions.

pkg/contacts.go

@@ -491,44 +491,11 @@ func (form *contactForm) TaxDetails() *CustomerTaxDetails {
 }
 
 func ServeEditContactTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	conn := getConn(r)
+	serveTagsEditForm(w, r, params, "/contacts/", "select tags from contact where slug = $1")
-	locale := getLocale(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/contacts/"+slug+"/tags"), slug, locale)
-	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), `select tags from contact where slug = $1`, form.Slug).Scan(form.Tags)) {
-		http.NotFound(w, r)
-		return
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/edit.gohtml", form)
 }
 
 func HandleUpdateContactTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	locale := getLocale(r)
+	handleUpdateTags(w, r, params, "/contacts/", "update contact set tags = $1 where slug = $2 returning slug")
-	conn := getConn(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/contacts/"+slug+"/tags/edit"), slug, locale)
-	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 conn.MustGetText(r.Context(), "", "update contact set tags = $1 where slug = $2 returning slug", form.Tags, form.Slug) == "" {
-		http.NotFound(w, r)
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/view.gohtml", form)
 }
 
 func ServeImportPage(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {

pkg/expenses.go

@@ -568,45 +568,11 @@ func (form *expenseFilterForm) BuildQuery(args []interface{}) (string, []interfa
 }
 
 func ServeEditExpenseTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	conn := getConn(r)
+	serveTagsEditForm(w, r, params, "/expenses/", "select tags from expense where slug = $1")
-	locale := getLocale(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/expenses/"+slug+"/tags"), slug, locale)
-	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), `select tags from expense where slug = $1`, form.Slug).Scan(form.Tags)) {
-		http.NotFound(w, r)
-		return
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/edit.gohtml", form)
 }
 
 func HandleUpdateExpenseTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	locale := getLocale(r)
+	handleUpdateTags(w, r, params, "/expenses/", "update expense set tags = $1 where slug = $2 returning slug")
-	conn := getConn(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/expenses/"+slug+"/tags/edit"), slug, locale)
-	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 conn.MustGetText(r.Context(), "", "update expense set tags = $1 where slug = $2 returning slug", form.Tags, form.Slug) == "" {
-		http.NotFound(w, r)
-		return
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/view.gohtml", form)
 }
 
 func ServeExpenseAttachment(w http.ResponseWriter, r *http.Request, params httprouter.Params) {

pkg/invoices.go

@@ -1447,70 +1447,12 @@ func handleInvoiceAction(w http.ResponseWriter, r *http.Request, action string,
 	}
 }
 
-type tagsForm struct {
-	Action string
-	Slug   string
-	Tags   *TagsField
-}
-
-func newTagsForm(uri string, slug string, locale *Locale) *tagsForm {
-	return &tagsForm{
-		Action: uri,
-		Slug:   slug,
-		Tags: &TagsField{
-			Name:  "tags-" + slug,
-			Label: pgettext("input", "Tags", locale),
-		},
-	}
-}
-
-func (form *tagsForm) Parse(r *http.Request) error {
-	if err := r.ParseForm(); err != nil {
-		return err
-	}
-	form.Tags.FillValue(r)
-	return nil
-}
-
 func ServeEditInvoiceTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	conn := getConn(r)
+	serveTagsEditForm(w, r, params, "/invoices/", "select tags from invoice where slug = $1")
-	locale := getLocale(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/invoices/"+slug+"/tags"), slug, locale)
-	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), `select tags from invoice where slug = $1`, form.Slug).Scan(form.Tags)) {
-		http.NotFound(w, r)
-		return
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/edit.gohtml", form)
 }
 
 func HandleUpdateInvoiceTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	locale := getLocale(r)
+	handleUpdateTags(w, r, params, "/invoices/", "update invoice set tags = $1 where slug = $2 returning slug")
-	conn := getConn(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/invoices/"+slug+"/tags/edit"), slug, locale)
-	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 conn.MustGetText(r.Context(), "", "update invoice set tags = $1 where slug = $2 returning slug", form.Tags, form.Slug) == "" {
-		http.NotFound(w, r)
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/view.gohtml", form)
 }
 
 func ServeInvoiceAttachment(w http.ResponseWriter, r *http.Request, params httprouter.Params) {

pkg/products.go

@@ -367,42 +367,9 @@ func HandleProductSearch(w http.ResponseWriter, r *http.Request, _ httprouter.Pa
 }
 
 func ServeEditProductTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	conn := getConn(r)
+	serveTagsEditForm(w, r, params, "/products/", "select tags from product where slug = $1")
-	locale := getLocale(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/products/"+slug+"/tags"), slug, locale)
-	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), `select tags from product where slug = $1`, form.Slug).Scan(form.Tags)) {
-		http.NotFound(w, r)
-		return
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/edit.gohtml", form)
 }
 
 func HandleUpdateProductTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	locale := getLocale(r)
+	handleUpdateTags(w, r, params, "/products/", "update product set tags = $1 where slug = $2 returning slug")
-	conn := getConn(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/products/"+slug+"/tags/edit"), slug, locale)
-	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 conn.MustGetText(r.Context(), "", "update product set tags = $1 where slug = $2 returning slug", form.Tags, form.Slug) == "" {
-		http.NotFound(w, r)
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/view.gohtml", form)
 }

pkg/quote.go

@@ -1187,42 +1187,9 @@ func handleQuoteAction(w http.ResponseWriter, r *http.Request, action string, re
 }
 
 func ServeEditQuoteTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	conn := getConn(r)
+	serveTagsEditForm(w, r, params, "/quotes/", "select tags from quote where slug = $1")
-	locale := getLocale(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/quotes/"+slug+"/tags"), slug, locale)
-	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), `select tags from quote where slug = $1`, form.Slug).Scan(form.Tags)) {
-		http.NotFound(w, r)
-		return
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/edit.gohtml", form)
 }
 
 func HandleUpdateQuoteTags(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	locale := getLocale(r)
+	handleUpdateTags(w, r, params, "/quotes/", "update quote set tags = $1 where slug = $2 returning slug")
-	conn := getConn(r)
-	company := getCompany(r)
-	slug := params[0].Value
-	if !ValidUuid(slug) {
-		http.NotFound(w, r)
-		return
-	}
-	form := newTagsForm(companyURI(company, "/quotes/"+slug+"/tags/edit"), slug, locale)
-	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 conn.MustGetText(r.Context(), "", "update quote set tags = $1 where slug = $2 returning slug", form.Tags, form.Slug) == "" {
-		http.NotFound(w, r)
-	}
-	mustRenderStandaloneTemplate(w, r, "tags/view.gohtml", form)
 }

pkg/tags.go

@@ -0,0 +1,73 @@
+package pkg
+
+import (
+	"github.com/julienschmidt/httprouter"
+	"net/http"
+)
+
+func serveTagsEditForm(w http.ResponseWriter, r *http.Request, params httprouter.Params, prefix string, sql string) {
+	conn := getConn(r)
+	locale := getLocale(r)
+	company := getCompany(r)
+	slug := params[0].Value
+	if !ValidUuid(slug) {
+		http.NotFound(w, r)
+		return
+	}
+	form := newTagsForm(companyURI(company, prefix+slug+"/tags"), slug, locale)
+	if notFoundErrorOrPanic(conn.QueryRow(r.Context(), sql, form.Slug).Scan(form.Tags)) {
+		http.NotFound(w, r)
+		return
+	}
+	mustRenderStandaloneTemplate(w, r, "tags/edit.gohtml", form)
+}
+
+type tagsForm struct {
+	Action string
+	Slug   string
+	Tags   *TagsField
+}
+
+func newTagsForm(uri string, slug string, locale *Locale) *tagsForm {
+	return &tagsForm{
+		Action: uri,
+		Slug:   slug,
+		Tags: &TagsField{
+			Name:  "tags-" + slug,
+			Label: pgettext("input", "Tags", locale),
+		},
+	}
+}
+
+func (form *tagsForm) Parse(r *http.Request) error {
+	if err := r.ParseForm(); err != nil {
+		return err
+	}
+	form.Tags.FillValue(r)
+	return nil
+}
+
+func handleUpdateTags(w http.ResponseWriter, r *http.Request, params httprouter.Params, prefix string, sql string) {
+	locale := getLocale(r)
+	conn := getConn(r)
+	company := getCompany(r)
+	slug := params[0].Value
+	if !ValidUuid(slug) {
+		http.NotFound(w, r)
+		return
+	}
+	form := newTagsForm(companyURI(company, prefix+slug+"/tags/edit"), slug, locale)
+	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 conn.MustGetText(r.Context(), "", sql, form.Tags, form.Slug) == "" {
+		http.NotFound(w, r)
+		return
+	}
+	mustRenderStandaloneTemplate(w, r, "tags/view.gohtml", form)
+}