numerus/pkg/invoices.go

1160 lines
37 KiB
Go
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2023-02-11 21:16:48 +00:00
package pkg
import (
"archive/zip"
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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"bytes"
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"context"
"errors"
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"fmt"
"github.com/julienschmidt/httprouter"
"html/template"
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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"io"
"log"
"math"
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"net/http"
"os"
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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"os/exec"
"sort"
"strconv"
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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"strings"
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"time"
)
const removedProductSuffix = ".removed"
type InvoiceEntry struct {
Slug string
Date time.Time
Number string
Total string
CustomerName string
Tags []string
Status string
StatusLabel string
}
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type InvoicesIndexPage struct {
Invoices []*InvoiceEntry
Filters *invoiceFilterForm
InvoiceStatuses map[string]string
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}
func IndexInvoices(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
conn := getConn(r)
locale := getLocale(r)
company := mustGetCompany(r)
filters := newInvoiceFilterForm(r.Context(), conn, locale, company)
if err := filters.Parse(r); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
page := &InvoicesIndexPage{
Invoices: mustCollectInvoiceEntries(r.Context(), conn, company, locale, filters),
Filters: filters,
InvoiceStatuses: mustCollectInvoiceStatuses(r.Context(), conn, locale),
}
mustRenderMainTemplate(w, r, "invoices/index.gohtml", page)
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}
func mustCollectInvoiceEntries(ctx context.Context, conn *Conn, company *Company, locale *Locale, filters *invoiceFilterForm) []*InvoiceEntry {
args := []interface{}{locale.Language.String(), company.Id}
where := []string{"invoice.company_id = $2"}
appendWhere := func(expression string, value interface{}) {
args = append(args, value)
where = append(where, fmt.Sprintf(expression, len(args)))
}
maybeAppendWhere := func(expression string, value string, conv func(string) interface{}) {
if value != "" {
if conv == nil {
appendWhere(expression, value)
} else {
appendWhere(expression, conv(value))
}
}
}
maybeAppendWhere("contact_id = $%d", filters.Customer.String(), func(v string) interface{} {
customerId, _ := strconv.Atoi(filters.Customer.Selected[0])
return customerId
})
maybeAppendWhere("invoice.invoice_status = $%d", filters.InvoiceStatus.String(), nil)
maybeAppendWhere("invoice_number = $%d", filters.InvoiceNumber.String(), nil)
maybeAppendWhere("invoice_date >= $%d", filters.FromDate.String(), nil)
maybeAppendWhere("invoice_date <= $%d", filters.ToDate.String(), nil)
if len(filters.Tags.Tags) > 0 {
if filters.TagsCondition.Selected == "and" {
appendWhere("invoice.tags @> $%d", filters.Tags)
} else {
appendWhere("invoice.tags && $%d", filters.Tags)
}
}
rows := conn.MustQuery(ctx, fmt.Sprintf(`
select invoice.slug
, invoice_date
, invoice_number
, contact.business_name
, invoice.tags
, invoice.invoice_status
, isi18n.name
, to_price(total, decimal_digits)
from invoice
join contact using (contact_id)
join invoice_status_i18n isi18n on invoice.invoice_status = isi18n.invoice_status and isi18n.lang_tag = $1
join invoice_amount using (invoice_id)
join currency using (currency_code)
where (%s)
order by invoice_date desc
, invoice_number desc
`, strings.Join(where, ") AND (")), args...)
defer rows.Close()
var entries []*InvoiceEntry
for rows.Next() {
entry := &InvoiceEntry{}
if err := rows.Scan(&entry.Slug, &entry.Date, &entry.Number, &entry.CustomerName, &entry.Tags, &entry.Status, &entry.StatusLabel, &entry.Total); err != nil {
panic(err)
}
entries = append(entries, entry)
}
if rows.Err() != nil {
panic(rows.Err())
}
return entries
}
func mustCollectInvoiceStatuses(ctx context.Context, conn *Conn, locale *Locale) map[string]string {
rows := conn.MustQuery(ctx, "select invoice_status.invoice_status, isi18n.name from invoice_status join invoice_status_i18n isi18n using(invoice_status) where isi18n.lang_tag = $1 order by invoice_status", locale.Language.String())
defer rows.Close()
statuses := map[string]string{}
for rows.Next() {
var key, name string
if err := rows.Scan(&key, &name); err != nil {
panic(err)
}
statuses[key] = name
}
if rows.Err() != nil {
panic(rows.Err())
}
return statuses
}
type invoiceFilterForm struct {
locale *Locale
company *Company
Customer *SelectField
InvoiceStatus *SelectField
InvoiceNumber *InputField
FromDate *InputField
ToDate *InputField
Tags *TagsField
TagsCondition *ToggleField
}
func newInvoiceFilterForm(ctx context.Context, conn *Conn, locale *Locale, company *Company) *invoiceFilterForm {
return &invoiceFilterForm{
locale: locale,
company: company,
Customer: &SelectField{
Name: "customer",
Label: pgettext("input", "Customer", locale),
EmptyLabel: gettext("All customers", locale),
Options: mustGetContactOptions(ctx, conn, company),
},
InvoiceStatus: &SelectField{
Name: "invoice_status",
Label: pgettext("input", "Invoice Status", locale),
EmptyLabel: gettext("All status", locale),
Options: MustGetOptions(ctx, conn, "select invoice_status.invoice_status, isi18n.name from invoice_status join invoice_status_i18n isi18n using(invoice_status) where isi18n.lang_tag = $1 order by invoice_status", locale.Language.String()),
},
InvoiceNumber: &InputField{
Name: "number",
Label: pgettext("input", "Invoice Number", locale),
Type: "search",
},
FromDate: &InputField{
Name: "from_date",
Label: pgettext("input", "From Date", locale),
Type: "date",
},
ToDate: &InputField{
Name: "to_date",
Label: pgettext("input", "To Date", locale),
Type: "date",
},
Tags: &TagsField{
Name: "tags",
Label: pgettext("input", "Tags", locale),
},
TagsCondition: &ToggleField{
Name: "tags_condition",
Label: pgettext("input", "Tags Condition", locale),
Selected: "and",
FirstOption: &ToggleOption{
Value: "and",
Label: pgettext("tag condition", "All", locale),
Description: gettext("Invoices must have all the specified labels.", locale),
},
SecondOption: &ToggleOption{
Value: "or",
Label: pgettext("tag condition", "Any", locale),
Description: gettext("Invoices must have at least one of the specified labels.", locale),
},
},
}
}
func (form *invoiceFilterForm) Parse(r *http.Request) error {
if err := r.ParseForm(); err != nil {
return err
}
form.Customer.FillValue(r)
form.InvoiceStatus.FillValue(r)
form.InvoiceNumber.FillValue(r)
form.FromDate.FillValue(r)
form.ToDate.FillValue(r)
form.Tags.FillValue(r)
form.TagsCondition.FillValue(r)
return nil
}
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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func ServeInvoice(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
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conn := getConn(r)
company := mustGetCompany(r)
slug := params[0].Value
switch slug {
case "new":
locale := getLocale(r)
form := newInvoiceForm(r.Context(), conn, locale, company)
if invoiceToDuplicate := r.URL.Query().Get("duplicate"); invoiceToDuplicate != "" {
form.MustFillFromDatabase(r.Context(), conn, invoiceToDuplicate)
form.InvoiceStatus.Selected = []string{"created"}
}
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form.Date.Val = time.Now().Format("2006-01-02")
w.WriteHeader(http.StatusOK)
mustRenderNewInvoiceForm(w, r, form)
case "product-form":
query := r.URL.Query()
index, _ := strconv.Atoi(query.Get("index"))
form := newInvoiceProductForm(index, company, getLocale(r), mustGetTaxOptions(r.Context(), conn, company))
productSlug := query.Get("slug")
if len(productSlug) > 0 {
if !form.MustFillFromDatabase(r.Context(), conn, productSlug) {
http.NotFound(w, r)
return
}
quantity, _ := strconv.Atoi(query.Get("product.quantity." + strconv.Itoa(index)))
if quantity > 0 {
form.Quantity.Val = strconv.Itoa(quantity)
}
w.Header().Set(HxTriggerAfterSettle, "recompute")
}
mustRenderStandaloneTemplate(w, r, "invoices/product-form.gohtml", form)
default:
pdf := false
if strings.HasSuffix(slug, ".pdf") {
pdf = true
slug = slug[:len(slug)-len(".pdf")]
}
inv := mustGetInvoice(r.Context(), conn, company, slug)
if inv == nil {
http.NotFound(w, r)
return
}
if pdf {
w.Header().Set("Content-Type", "application/pdf")
mustWriteInvoicePdf(w, r, inv)
} else {
mustRenderMainTemplate(w, r, "invoices/view.gohtml", inv)
}
}
}
func mustWriteInvoicePdf(w io.Writer, r *http.Request, inv *invoice) {
cmd := exec.Command("weasyprint", "--format", "pdf", "--stylesheet", "web/static/invoice.css", "-", "-")
var stderr bytes.Buffer
cmd.Stderr = &stderr
stdin, err := cmd.StdinPipe()
if err != nil {
panic(err)
}
stdout, err := cmd.StdoutPipe()
if err != nil {
panic(err)
}
defer func() {
err := stdout.Close()
if !errors.Is(err, os.ErrClosed) {
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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panic(err)
}
}()
if err = cmd.Start(); err != nil {
panic(err)
}
go func() {
defer mustClose(stdin)
mustRenderAppTemplate(stdin, r, "invoices/view.gohtml", inv)
}()
if _, err = io.Copy(w, stdout); err != nil {
panic(err)
}
if err := cmd.Wait(); err != nil {
log.Printf("ERR - %v\n", stderr.String())
panic(err)
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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}
}
func mustClose(closer io.Closer) {
if err := closer.Close(); err != nil {
panic(err)
}
}
type invoice struct {
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Number string
Slug string
Date time.Time
Invoicer taxDetails
Invoicee taxDetails
Notes string
PaymentInstructions string
Products []*invoiceProduct
Subtotal string
Taxes [][]string
TaxClasses []string
HasDiscounts bool
Total string
LegalDisclaimer string
}
type taxDetails struct {
Name string
VATIN string
Address string
City string
PostalCode string
Province string
Email string
Phone string
}
type invoiceProduct struct {
Name string
Description string
Price string
Discount int
Quantity int
Taxes map[string]int
Subtotal string
Total string
}
func mustGetInvoice(ctx context.Context, conn *Conn, company *Company, slug string) *invoice {
Convert invoices to PDF with WeasyPrint Although it is possible to just print the invoice from the browser, many people will not even try an assume that they can not create a PDF for the invoice. I thought of using Groff or TeX to create the PDF, but it would mean maintaining two templates in two different systems (HTML and whatever i would use), and would probably look very different, because i do not know Groff or TeX that well. I wish there was a way to tell the browser to print to PDF, and it can be done, but only with the Chrome Protocol to a server-side running Chrome instance. This works, but i would need a Chrome running as a daemon. I also wrote a Qt application that uses QWebEngine to print the PDF, much like wkhtmltopdf, but with support for more recent HTML and CSS standards. Unfortunately, Qt 6.4’s embedded Chromium does not follow break-page-inside as well as WeasyPrint does. To use WeasyPrint, at first i wanted to reach the same URL as the user, passing the cookie to WeasyPrint so that i can access the same invoice as the user, something that can be done with wkhtmltopdf, but WeasyPrint does not have such option. I did it with a custom Python script, but then i need to package and install that script, that is not that much work, but using the Debian-provided script is even less work, and less likely to drift when WeasyPrint changes API. Also, it is unnecessary to do a network round-trip from Go to Python back to Go, because i can already write the invoice HTML as is to WeasyPrint’s stdin.
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inv := &invoice{
Slug: slug,
}
var invoiceId int
var decimalDigits int
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if notFoundErrorOrPanic(conn.QueryRow(ctx, "select invoice_id, decimal_digits, invoice_number, invoice_date, notes, instructions, business_name, vatin, phone, email, address, city, province, postal_code, to_price(subtotal, decimal_digits), to_price(total, decimal_digits) from invoice join payment_method using (payment_method_id) join contact using (contact_id) join invoice_amount using (invoice_id) join currency using (currency_code) where invoice.slug = $1", slug).Scan(&invoiceId, &decimalDigits, &inv.Number, &inv.Date, &inv.Notes, &inv.PaymentInstructions, &inv.Invoicee.Name, &inv.Invoicee.VATIN, &inv.Invoicee.Phone, &inv.Invoicee.Email, &inv.Invoicee.Address, &inv.Invoicee.City, &inv.Invoicee.Province, &inv.Invoicee.PostalCode, &inv.Subtotal, &inv.Total)) {
return nil
}
if err := conn.QueryRow(ctx, "select business_name, vatin, phone, email, address, city, province, postal_code, legal_disclaimer from company where company_id = $1", company.Id).Scan(&inv.Invoicer.Name, &inv.Invoicer.VATIN, &inv.Invoicer.Phone, &inv.Invoicer.Email, &inv.Invoicer.Address, &inv.Invoicer.City, &inv.Invoicer.Province, &inv.Invoicer.PostalCode, &inv.LegalDisclaimer); err != nil {
panic(err)
}
if err := conn.QueryRow(ctx, "select array_agg(array[name, to_price(amount, $2)]) from invoice_tax_amount join tax using (tax_id) where invoice_id = $1", invoiceId, decimalDigits).Scan(&inv.Taxes); err != nil {
panic(err)
}
rows := conn.MustQuery(ctx, "select invoice_product.name, description, to_price(price, $2), (discount_rate * 100)::integer, quantity, to_price(subtotal, $2), to_price(total, $2), array_agg(array[tax_class.name, (tax_rate * 100)::integer::text]) filter (where tax_rate is not null) from invoice_product join invoice_product_amount using (invoice_product_id) left join invoice_product_tax using (invoice_product_id) left join tax using (tax_id) left join tax_class using (tax_class_id) where invoice_id = $1 group by invoice_product.name, description, discount_rate, price, quantity, subtotal, total", invoiceId, decimalDigits)
defer rows.Close()
taxClasses := map[string]bool{}
for rows.Next() {
product := &invoiceProduct{
Taxes: make(map[string]int),
}
var taxes [][]string
if err := rows.Scan(&product.Name, &product.Description, &product.Price, &product.Discount, &product.Quantity, &product.Subtotal, &product.Total, &taxes); err != nil {
panic(err)
}
for _, tax := range taxes {
taxClass := tax[0]
taxClasses[taxClass] = true
product.Taxes[taxClass], _ = strconv.Atoi(tax[1])
}
if product.Discount > 0 {
inv.HasDiscounts = true
}
inv.Products = append(inv.Products, product)
}
for taxClass := range taxClasses {
inv.TaxClasses = append(inv.TaxClasses, taxClass)
}
sort.Strings(inv.TaxClasses)
if rows.Err() != nil {
panic(rows.Err())
}
return inv
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}
type newInvoicePage struct {
Form *invoiceForm
Subtotal string
Taxes [][]string
Total string
}
func newNewInvoicePage(form *invoiceForm, r *http.Request) *newInvoicePage {
page := &newInvoicePage{
Form: form,
}
conn := getConn(r)
company := mustGetCompany(r)
err := conn.QueryRow(r.Context(), "select subtotal, taxes, total from compute_new_invoice_amount($1, $2)", company.Id, NewInvoiceProductArray(form.Products)).Scan(&page.Subtotal, &page.Taxes, &page.Total)
if err != nil {
panic(err)
}
if len(form.Products) == 0 {
form.Products = append(form.Products, newInvoiceProductForm(0, company, getLocale(r), mustGetTaxOptions(r.Context(), conn, company)))
}
return page
}
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func mustRenderNewInvoiceForm(w http.ResponseWriter, r *http.Request, form *invoiceForm) {
locale := getLocale(r)
form.Customer.EmptyLabel = gettext("Select a customer to bill.", locale)
page := newNewInvoicePage(form, r)
mustRenderMainTemplate(w, r, "invoices/new.gohtml", page)
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}
func mustRenderNewInvoiceProductsForm(w http.ResponseWriter, r *http.Request, action string, form *invoiceForm) {
conn := getConn(r)
company := mustGetCompany(r)
page := newInvoiceProductsPage{
Action: companyURI(company, action),
Form: form,
Products: mustGetProductChoices(r.Context(), conn, company),
}
mustRenderMainTemplate(w, r, "invoices/products.gohtml", page)
}
func mustGetProductChoices(ctx context.Context, conn *Conn, company *Company) []*productChoice {
rows := conn.MustQuery(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)
defer rows.Close()
var choices []*productChoice
for rows.Next() {
entry := &productChoice{}
if err := rows.Scan(&entry.Slug, &entry.Name, &entry.Price); err != nil {
panic(err)
}
choices = append(choices, entry)
}
if rows.Err() != nil {
panic(rows.Err())
}
return choices
}
type newInvoiceProductsPage struct {
Action string
Form *invoiceForm
Products []*productChoice
}
type productChoice struct {
Slug string
Name string
Price string
}
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func HandleAddInvoice(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newInvoiceForm(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() {
if !IsHTMxRequest(r) {
w.WriteHeader(http.StatusUnprocessableEntity)
}
mustRenderNewInvoiceForm(w, r, form)
return
}
slug := conn.MustGetText(r.Context(), "", "select add_invoice($1, $2, $3, $4, $5, $6, $7)", company.Id, form.Date, form.Customer, form.Notes, form.PaymentMethod, form.Tags, NewInvoiceProductArray(form.Products))
htmxRedirect(w, r, companyURI(company, "/invoices/"+slug))
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}
func HandleNewInvoiceAction(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
switch params[0].Value {
case "new":
handleInvoiceAction(w, r, "/invoices/new", mustRenderNewInvoiceForm)
case "batch":
HandleBatchInvoiceAction(w, r, params)
default:
http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
}
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}
func HandleBatchInvoiceAction(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
if err := r.ParseForm(); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if err := verifyCsrfTokenValid(r); err != nil {
http.Error(w, err.Error(), http.StatusForbidden)
return
}
slugs := r.Form["invoice"]
if len(slugs) == 0 {
http.Redirect(w, r, companyURI(mustGetCompany(r), "/invoices"), http.StatusSeeOther)
return
}
locale := getLocale(r)
switch r.Form.Get("action") {
case "download":
invoices := mustWriteInvoicesPdf(r, slugs)
w.Header().Set("Content-Type", "application/zip")
w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s", gettext("invoices.zip", locale)))
w.WriteHeader(http.StatusOK)
if _, err := w.Write(invoices); err != nil {
panic(err)
}
default:
http.Error(w, gettext("Invalid action", locale), http.StatusBadRequest)
}
}
func mustWriteInvoicesPdf(r *http.Request, slugs []string) []byte {
conn := getConn(r)
company := mustGetCompany(r)
buf := new(bytes.Buffer)
w := zip.NewWriter(buf)
for _, slug := range slugs {
inv := mustGetInvoice(r.Context(), conn, company, slug)
if inv == nil {
continue
}
f, err := w.Create(inv.Number + ".pdf")
if err != nil {
panic(err)
}
mustWriteInvoicePdf(f, r, inv)
}
mustClose(w)
return buf.Bytes()
}
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type invoiceForm struct {
locale *Locale
company *Company
Number string
InvoiceStatus *SelectField
Customer *SelectField
Date *InputField
Notes *InputField
PaymentMethod *SelectField
Tags *TagsField
Products []*invoiceProductForm
RemovedProduct *invoiceProductForm
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}
func newInvoiceForm(ctx context.Context, conn *Conn, locale *Locale, company *Company) *invoiceForm {
return &invoiceForm{
locale: locale,
company: company,
InvoiceStatus: &SelectField{
Name: "invoice_status",
Required: true,
Label: pgettext("input", "Invoice Status", locale),
Selected: []string{"created"},
Options: MustGetOptions(ctx, conn, "select invoice_status.invoice_status, isi18n.name from invoice_status join invoice_status_i18n isi18n using(invoice_status) where isi18n.lang_tag = $1 order by invoice_status", locale.Language.String()),
},
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Customer: &SelectField{
Name: "customer",
Label: pgettext("input", "Customer", locale),
Required: true,
Options: mustGetContactOptions(ctx, conn, company),
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},
Date: &InputField{
Name: "date",
Label: pgettext("input", "Invoice Date", locale),
Type: "date",
Required: true,
},
Notes: &InputField{
Name: "notes",
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Label: pgettext("input", "Notes", locale),
Type: "textarea",
},
Tags: &TagsField{
Name: "tags",
Label: pgettext("input", "Tags", locale),
},
PaymentMethod: &SelectField{
Name: "payment_method",
Required: true,
Label: pgettext("input", "Payment Method", locale),
Selected: []string{conn.MustGetText(ctx, "", "select default_payment_method_id::text from company where company_id = $1", company.Id)},
Options: MustGetOptions(ctx, conn, "select payment_method_id::text, name from payment_method where company_id = $1", company.Id),
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},
}
}
func (form *invoiceForm) Parse(r *http.Request) error {
if err := r.ParseForm(); err != nil {
return err
}
form.InvoiceStatus.FillValue(r)
form.Customer.FillValue(r)
form.Date.FillValue(r)
form.Notes.FillValue(r)
form.Tags.FillValue(r)
form.PaymentMethod.FillValue(r)
if _, ok := r.Form["product.id.0"]; ok {
taxOptions := mustGetTaxOptions(r.Context(), getConn(r), form.company)
for index := 0; true; index++ {
if _, ok := r.Form["product.id."+strconv.Itoa(index)]; !ok {
break
}
productForm := newInvoiceProductForm(index, form.company, form.locale, taxOptions)
if err := productForm.Parse(r); err != nil {
return err
}
form.Products = append(form.Products, productForm)
}
}
return nil
}
func (form *invoiceForm) Validate() bool {
validator := newFormValidator()
validator.CheckValidSelectOption(form.InvoiceStatus, gettext("Selected invoice status is not valid.", form.locale))
validator.CheckValidSelectOption(form.Customer, gettext("Selected customer is not valid.", form.locale))
if validator.CheckRequiredInput(form.Date, gettext("Invoice date can not be empty.", form.locale)) {
validator.CheckValidDate(form.Date, gettext("Invoice date must be a valid date.", form.locale))
}
validator.CheckValidSelectOption(form.PaymentMethod, gettext("Selected payment method is not valid.", form.locale))
allOK := validator.AllOK()
for _, product := range form.Products {
allOK = product.Validate() && allOK
}
return allOK
}
func (form *invoiceForm) Update() {
products := form.Products
form.Products = nil
for n, product := range products {
if product.Quantity.Val != "0" {
product.Update()
if n != len(form.Products) {
product.Index = len(form.Products)
product.Rename()
}
form.Products = append(form.Products, product)
}
}
}
func (form *invoiceForm) RemoveProduct(index int) {
products := form.Products
form.Products = nil
for n, product := range products {
if n == index {
form.RemovedProduct = product
} else {
if n != len(form.Products) {
product.Index = len(form.Products)
product.Rename()
}
form.Products = append(form.Products, product)
}
}
if form.RemovedProduct != nil {
form.RemovedProduct.RenameWithSuffix(removedProductSuffix)
}
}
const selectProductBySlug = `
select ''
, product_id
, name
, description
, to_price(price, decimal_digits)
, 1 as quantity
, 0 as discount
, array_remove(array_agg(tax_id), null)
from product
join company using (company_id)
join currency using (currency_code)
left join product_tax using (product_id)
where product.slug = any ($1)
group by product_id
, name
, description
, price
, decimal_digits
`
func (form *invoiceForm) AddProducts(ctx context.Context, conn *Conn, productsSlug []string) {
form.mustAddProductsFromQuery(ctx, conn, selectProductBySlug, productsSlug)
}
func (form *invoiceForm) mustAddProductsFromQuery(ctx context.Context, conn *Conn, sql string, args ...interface{}) {
index := len(form.Products)
taxOptions := mustGetTaxOptions(ctx, conn, form.company)
rows := conn.MustQuery(ctx, sql, args...)
defer rows.Close()
for rows.Next() {
product := newInvoiceProductForm(index, form.company, form.locale, taxOptions)
if err := rows.Scan(product.InvoiceProductId, product.ProductId, product.Name, product.Description, product.Price, product.Quantity, product.Discount, product.Tax); err != nil {
panic(err)
}
form.Products = append(form.Products, product)
index++
}
if rows.Err() != nil {
panic(rows.Err())
}
}
func (form *invoiceForm) InsertProduct(product *invoiceProductForm) {
replaced := false
for n, existing := range form.Products {
if existing.Quantity.Val == "" || existing.Quantity.Val == "0" {
product.Index = n
form.Products[n] = product
replaced = true
break
}
}
if !replaced {
product.Index = len(form.Products)
form.Products = append(form.Products, product)
}
product.Rename()
}
func (form *invoiceForm) MustFillFromDatabase(ctx context.Context, conn *Conn, slug string) bool {
var invoiceId int
selectedInvoiceStatus := form.InvoiceStatus.Selected
form.InvoiceStatus.Clear()
selectedPaymentMethod := form.PaymentMethod.Selected
form.PaymentMethod.Clear()
if notFoundErrorOrPanic(conn.QueryRow(ctx, `
select invoice_id
, invoice_status
, contact_id
, invoice_number
, invoice_date
, notes
, payment_method_id
, tags
from invoice
where slug = $1
`, slug).Scan(&invoiceId, form.InvoiceStatus, form.Customer, &form.Number, form.Date, form.Notes, form.PaymentMethod, form.Tags)) {
form.PaymentMethod.Selected = selectedPaymentMethod
form.InvoiceStatus.Selected = selectedInvoiceStatus
return false
}
form.Products = []*invoiceProductForm{}
form.mustAddProductsFromQuery(ctx, conn, "select invoice_product_id::text, coalesce(product_id, 0), name, description, to_price(price, $2), quantity, (discount_rate * 100)::integer, array_remove(array_agg(tax_id), null) from invoice_product left join invoice_product_product using (invoice_product_id) left join invoice_product_tax using (invoice_product_id) where invoice_id = $1 group by invoice_product_id, coalesce(product_id, 0), name, description, discount_rate, price, quantity", invoiceId, form.company.DecimalDigits)
return true
}
func mustGetTaxOptions(ctx context.Context, conn *Conn, company *Company) []*SelectOption {
return MustGetGroupedOptions(ctx, conn, "select tax_id::text, tax.name, tax_class.name from tax join tax_class using (tax_class_id) where tax.company_id = $1 order by tax_class.name, tax.name", company.Id)
}
func mustGetContactOptions(ctx context.Context, conn *Conn, company *Company) []*SelectOption {
return MustGetOptions(ctx, conn, "select contact_id::text, business_name from contact where company_id = $1 order by business_name", company.Id)
}
type invoiceProductForm struct {
locale *Locale
company *Company
Index int
InvoiceProductId *InputField
ProductId *InputField
Name *InputField
Description *InputField
Price *InputField
Quantity *InputField
Discount *InputField
Tax *SelectField
}
func newInvoiceProductForm(index int, company *Company, locale *Locale, taxOptions []*SelectOption) *invoiceProductForm {
triggerRecompute := template.HTMLAttr(`data-hx-on="change: this.dispatchEvent(new CustomEvent('recompute', {bubbles: true}))"`)
form := &invoiceProductForm{
locale: locale,
company: company,
Index: index,
InvoiceProductId: &InputField{
Label: pgettext("input", "Id", locale),
Type: "hidden",
Required: true,
},
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ProductId: &InputField{
Label: pgettext("input", "Id", locale),
Type: "hidden",
Required: true,
},
Name: &InputField{
Label: pgettext("input", "Name", locale),
Type: "text",
Required: true,
Is: "numerus-product-search",
Attributes: []template.HTMLAttr{
`autocomplete="off"`,
`data-hx-trigger="keyup changed delay:200"`,
`data-hx-target="next .options"`,
`data-hx-indicator="closest div"`,
`data-hx-swap="innerHTML"`,
template.HTMLAttr(fmt.Sprintf(`data-hx-get="%v"`, companyURI(company, "/search/products"))),
},
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},
Description: &InputField{
Label: pgettext("input", "Description", locale),
Type: "textarea",
},
Price: &InputField{
Label: pgettext("input", "Price", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
triggerRecompute,
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`min="0"`,
template.HTMLAttr(fmt.Sprintf(`step="%v"`, company.MinCents())),
},
},
Quantity: &InputField{
Label: pgettext("input", "Quantity", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
triggerRecompute,
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`min="0"`,
},
},
Discount: &InputField{
Label: pgettext("input", "Discount (%)", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
triggerRecompute,
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`min="0"`,
`max="100"`,
},
},
Tax: &SelectField{
Label: pgettext("input", "Taxes", locale),
Multiple: true,
Options: taxOptions,
Attributes: []template.HTMLAttr{
triggerRecompute,
},
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},
}
form.Rename()
return form
}
func (form *invoiceProductForm) Rename() {
form.RenameWithSuffix("." + strconv.Itoa(form.Index))
}
func (form *invoiceProductForm) RenameWithSuffix(suffix string) {
form.InvoiceProductId.Name = "product.invoice_product_id" + suffix
form.ProductId.Name = "product.id" + suffix
form.Name.Name = "product.name" + suffix
form.Description.Name = "product.description" + suffix
form.Price.Name = "product.price" + suffix
form.Quantity.Name = "product.quantity" + suffix
form.Discount.Name = "product.discount" + suffix
form.Tax.Name = "product.tax" + suffix
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}
func (form *invoiceProductForm) Parse(r *http.Request) error {
if err := r.ParseForm(); err != nil {
return err
}
form.InvoiceProductId.FillValue(r)
form.ProductId.FillValue(r)
form.Name.FillValue(r)
form.Description.FillValue(r)
form.Price.FillValue(r)
form.Quantity.FillValue(r)
form.Discount.FillValue(r)
form.Tax.FillValue(r)
return nil
}
func (form *invoiceProductForm) Validate() bool {
validator := newFormValidator()
if form.InvoiceProductId.Val != "" {
validator.CheckValidInteger(form.InvoiceProductId, 1, math.MaxInt32, gettext("Invoice product ID must be a number greater than zero.", form.locale))
}
if form.ProductId.Val != "" {
validator.CheckValidInteger(form.ProductId, 0, math.MaxInt32, gettext("Product ID must be a positive number or zero.", form.locale))
}
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))
}
if validator.CheckRequiredInput(form.Quantity, gettext("Quantity can not be empty.", form.locale)) {
validator.CheckValidInteger(form.Quantity, 1, math.MaxInt32, gettext("Quantity must be a number greater than zero.", form.locale))
}
if validator.CheckRequiredInput(form.Discount, gettext("Discount can not be empty.", form.locale)) {
validator.CheckValidInteger(form.Discount, 0, 100, gettext("Discount must be a percentage between 0 and 100.", 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()
}
func (form *invoiceProductForm) Update() {
validator := newFormValidator()
if !validator.CheckValidDecimal(form.Price, form.company.MinCents(), math.MaxFloat64, "") {
form.Price.Val = "0.0"
form.Price.Errors = nil
}
if !validator.CheckValidInteger(form.Quantity, 0, math.MaxInt32, "") {
form.Quantity.Val = "1"
form.Quantity.Errors = nil
}
if !validator.CheckValidInteger(form.Discount, 0, 100, "") {
form.Discount.Val = "0"
form.Discount.Errors = nil
}
}
func (form *invoiceProductForm) MustFillFromDatabase(ctx context.Context, conn *Conn, slug string) bool {
return !notFoundErrorOrPanic(conn.QueryRow(ctx, selectProductBySlug, []string{slug}).Scan(
form.InvoiceProductId,
form.ProductId,
form.Name,
form.Description,
form.Price,
form.Quantity,
form.Discount,
form.Tax))
}
func HandleUpdateInvoice(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newInvoiceForm(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 r.FormValue("quick") == "status" {
slug := conn.MustGetText(r.Context(), "", "update invoice set invoice_status = $1 where slug = $2 returning slug", form.InvoiceStatus, params[0].Value)
if slug == "" {
http.NotFound(w, r)
}
htmxRedirect(w, r, companyURI(mustGetCompany(r), "/invoices"))
} else {
slug := params[0].Value
if !form.Validate() {
if !IsHTMxRequest(r) {
w.WriteHeader(http.StatusUnprocessableEntity)
}
mustRenderEditInvoiceForm(w, r, slug, form)
return
}
slug = conn.MustGetText(r.Context(), "", "select edit_invoice($1, $2, $3, $4, $5, $6, $7)", slug, form.InvoiceStatus, form.Customer, form.Notes, form.PaymentMethod, form.Tags, EditedInvoiceProductArray(form.Products))
if slug == "" {
http.NotFound(w, r)
return
}
htmxRedirect(w, r, companyURI(company, "/invoices/"+slug))
}
}
func htmxRedirect(w http.ResponseWriter, r *http.Request, uri string) {
if IsHTMxRequest(r) {
w.Header().Set(HxLocation, MustMarshalHTMxLocation(&HTMxLocation{
Path: uri,
Target: "main",
}))
w.WriteHeader(http.StatusNoContent)
} else {
http.Redirect(w, r, uri, http.StatusSeeOther)
}
}
func ServeEditInvoice(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
conn := getConn(r)
company := mustGetCompany(r)
slug := params[0].Value
locale := getLocale(r)
form := newInvoiceForm(r.Context(), conn, locale, company)
if !form.MustFillFromDatabase(r.Context(), conn, slug) {
http.NotFound(w, r)
return
}
w.WriteHeader(http.StatusOK)
mustRenderEditInvoiceForm(w, r, slug, form)
}
type editInvoicePage struct {
*newInvoicePage
Slug string
Number string
}
func newEditInvoicePage(slug string, form *invoiceForm, r *http.Request) *editInvoicePage {
return &editInvoicePage{
newNewInvoicePage(form, r),
slug,
form.Number,
}
}
func mustRenderEditInvoiceForm(w http.ResponseWriter, r *http.Request, slug string, form *invoiceForm) {
page := newEditInvoicePage(slug, form, r)
mustRenderMainTemplate(w, r, "invoices/edit.gohtml", page)
}
func HandleEditInvoiceAction(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
slug := params[0].Value
actionUri := fmt.Sprintf("/invoices/%s/edit", slug)
handleInvoiceAction(w, r, actionUri, func(w http.ResponseWriter, r *http.Request, form *invoiceForm) {
conn := getConn(r)
form.Number = conn.MustGetText(r.Context(), "", "select invoice_number from invoice where slug = $1", slug)
mustRenderEditInvoiceForm(w, r, slug, form)
})
}
type renderFormFunc func(w http.ResponseWriter, r *http.Request, form *invoiceForm)
func handleInvoiceAction(w http.ResponseWriter, r *http.Request, action string, renderForm renderFormFunc) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newInvoiceForm(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
}
actionField := r.Form.Get("action")
switch actionField {
case "update":
form.Update()
w.WriteHeader(http.StatusOK)
renderForm(w, r, form)
case "select-products":
w.WriteHeader(http.StatusOK)
mustRenderNewInvoiceProductsForm(w, r, action, form)
case "add-products":
form.AddProducts(r.Context(), conn, r.Form["slug"])
w.WriteHeader(http.StatusOK)
renderForm(w, r, form)
case "restore-product":
restoredProduct := newInvoiceProductForm(0, company, locale, mustGetTaxOptions(r.Context(), conn, company))
restoredProduct.RenameWithSuffix(removedProductSuffix)
if err := restoredProduct.Parse(r); err != nil {
panic(err)
}
form.InsertProduct(restoredProduct)
form.Update()
w.WriteHeader(http.StatusOK)
renderForm(w, r, form)
default:
prefix := "remove-product."
if strings.HasPrefix(actionField, prefix) {
index, err := strconv.Atoi(actionField[len(prefix):])
if err != nil {
http.Error(w, gettext("Invalid action", locale), http.StatusBadRequest)
} else {
form.RemoveProduct(index)
form.Update()
w.WriteHeader(http.StatusOK)
renderForm(w, r, form)
}
} else {
http.Error(w, gettext("Invalid action", locale), http.StatusBadRequest)
}
}
}
type tagsForm struct {
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Action string
Slug string
Tags *TagsField
}
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func newTagsForm(uri string, slug string, locale *Locale) *tagsForm {
return &tagsForm{
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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)
locale := getLocale(r)
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company := getCompany(r)
slug := params[0].Value
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)
conn := getConn(r)
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company := getCompany(r)
slug := params[0].Value
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
}
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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)
}