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receipt.go
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receipt.go
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package main
import (
"bytes"
"encoding/base64"
"encoding/hex"
"errors"
"io/ioutil"
"os"
"os/exec"
"strconv"
"text/template"
"time"
"github.com/phin1x/go-ipp"
"github.com/skip2/go-qrcode"
"github.com/wisepythagoras/pos-system/crypto"
)
// ReceiptTmplData describes the template data for the receipt.
type ReceiptTmplData struct {
Total float64
Order *OrderJSON
Products *[]AggregateProduct
Qrcode string
Name string
Address1 string
Address2 string
DateString string
}
// Receipt describes the receipt object. It should contain an order and the config.
type Receipt struct {
Order *OrderJSON
Total float64
Config *Config
Client *ipp.IPPClient
printerId int
}
// GetPrinter returns the index of the selected printer in the configuration array.
func (r *Receipt) GetPrinter() int {
printerId := r.printerId
if printerId <= 0 {
printerId = 1
}
printerIdx := 0
for i, p := range r.Config.Printers {
if p.ID == printerId {
printerIdx = i
break
}
}
return printerIdx
}
// ConnectToPrinter connects to the printer server.
func (r *Receipt) ConnectToPrinter() error {
if len(r.Config.Printers) == 0 {
return errors.New("no printers were specified in the config")
}
printerIdx := r.GetPrinter()
// TODO: In order to support multiple printers, this should take a specific index.
server := r.Config.Printers[printerIdx].Server
port := r.Config.Printers[printerIdx].Port
username := r.Config.Printers[printerIdx].Username
password := r.Config.Printers[printerIdx].Password
// Connect to the printer server.
r.Client = ipp.NewIPPClient(server, port, username, password, true)
return nil
}
// Print prints the receipt.
func (r *Receipt) Print() (int, error) {
// Connect to the printer if the connection died.
if r.Client.TestConnection() != nil {
r.ConnectToPrinter()
}
// Create the file.
data, err := ioutil.ReadFile("templates/receipt.html")
if err != nil {
return 99, err
}
t, err := template.New("receipt").Parse(string(data))
if err != nil {
return 99, err
}
fileName := "receipt-" + strconv.Itoa(int(r.Order.ID))
// Create a file for the rendered receipt.
receiptFile, err := os.OpenFile("receipts/"+fileName+".html", os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
return 99, err
}
defer receiptFile.Close()
encryptJSON := `{"i": ` + strconv.Itoa(int(r.Order.ID)) + `}`
encryptedId, _ := crypto.EncryptGCM([]byte(encryptJSON), []byte(r.Config.Key))
hexEncryptedId := hex.EncodeToString(encryptedId)
png, _ := qrcode.Encode(hexEncryptedId, qrcode.Medium, 160)
// This is the new buffer that will contain the executedtemplate.
buff := new(bytes.Buffer)
var aggregateProducts []AggregateProduct
var aggregateMap map[uint64]uint = make(map[uint64]uint)
var products map[uint64]ProductJSON = make(map[uint64]ProductJSON)
// Find how many of each products we have.
for _, product := range r.Order.Products {
if val, ok := aggregateMap[product.ID]; ok {
aggregateMap[product.ID] = val + 1
} else {
aggregateMap[product.ID] = 1
products[product.ID] = ProductJSON{
ID: product.ID,
Name: product.Name,
Price: product.Price,
Type: product.ProductType.Name,
Discontinued: product.Discontinued,
SoldOut: product.SoldOut,
}
}
}
// Now compose the aggregate product array.
for productId, quantity := range aggregateMap {
product := products[productId]
aggregateProduct := AggregateProduct{
Quantity: quantity,
ID: product.ID,
Name: product.Name,
Price: float64(quantity) * product.Price,
Type: product.ProductType.Name,
}
aggregateProducts = append(aggregateProducts, aggregateProduct)
}
tmplData := ReceiptTmplData{
Total: r.Total,
Order: r.Order,
Qrcode: base64.StdEncoding.EncodeToString(png),
Products: &aggregateProducts,
Name: r.Config.Name,
Address1: r.Config.Address1,
Address2: r.Config.Address2,
DateString: r.Order.CreatedAt.Format(time.RFC1123),
}
// Execute the receipt.
err = t.Execute(buff, tmplData)
receiptFile.WriteString(buff.String())
cwd, _ := os.Getwd()
input := cwd + "/receipts/" + fileName + ".html"
output := cwd + "/receipts/" + fileName + ".pdf"
// Now we want to convert the receipt to a PDF so that the printer can render it.
cmd := exec.Command("wkhtmltopdf", "--page-width", "80", "--page-height", "200", input, output)
err = cmd.Start()
if err != nil {
return 99, err
}
err = cmd.Wait()
if err != nil {
return 99, err
}
if len(r.Config.Printers) == 0 {
return -1, errors.New("No printers are set up")
}
printerIdx := r.GetPrinter()
printer := r.Config.Printers[printerIdx].Name
// Finally, call the printer to print the receipt.
return r.Client.PrintFile(output, printer, map[string]interface{}{})
}