Setting un invoice pdf microservice
This commit is contained in:
86
cmd/micro/invoice/helpers.go
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86
cmd/micro/invoice/helpers.go
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@ -0,0 +1,86 @@
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package main
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import (
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"encoding/json"
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"errors"
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"io"
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"net/http"
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"os"
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)
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type JSONResponse struct {
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OK bool `json:"ok"`
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Message string `json:"message,omitempty"`
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}
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func (app *application) readJSON(w http.ResponseWriter, r *http.Request, data interface{}) error {
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maxBytes := 1048576
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r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes))
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dec := json.NewDecoder(r.Body)
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err := dec.Decode(data)
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if err != nil {
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return err
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}
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// Make sure there is only one entry.
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err = dec.Decode(&struct{}{})
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if err != io.EOF {
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return errors.New("body must only have a single JSON value")
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}
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return nil
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}
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// writeJSON writes arbitrary data out as JSON
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func (app *application) writeJSON(
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w http.ResponseWriter,
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status int, data interface{},
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headers ...http.Header,
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) error {
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out, err := json.MarshalIndent(data, "", "\t")
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if err != nil {
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return err
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}
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if len(headers) > 0 {
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for k, v := range headers[0] {
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w.Header()[k] = v
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}
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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w.Write(out)
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return nil
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}
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func (app *application) badRequest(w http.ResponseWriter, r *http.Request, err error) error {
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var payload JSONResponse
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payload.OK = false
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payload.Message = err.Error()
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out, err := json.MarshalIndent(payload, "", "\t")
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if err != nil {
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return err
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusBadGateway)
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w.Write(out)
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return nil
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}
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func (app *application) CreateDirIfNotExist(path string) error {
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const mode = 0755
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if _, err := os.Stat(path); os.IsNotExist(err) {
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err := os.Mkdir(path, mode)
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if err != nil {
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app.errorLog.Println(err)
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return err
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}
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}
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return nil
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}
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145
cmd/micro/invoice/invoice-handlers.go
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145
cmd/micro/invoice/invoice-handlers.go
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@ -0,0 +1,145 @@
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package main
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import (
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"fmt"
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"net/http"
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"time"
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"github.com/phpdave11/gofpdf"
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"github.com/phpdave11/gofpdf/contrib/gofpdi"
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)
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type Order struct {
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ID int `json:"id"`
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Quantity int `json:"quantity"`
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Amount int `json:"amount"`
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Product string `json:"product"`
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FirstName string `json:"first_name"`
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LastName string `json:"last_name"`
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Email string `json:"email"`
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CreatedAt time.Time `json:"-"`
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}
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func (app *application) CreateAndSendInvoice(w http.ResponseWriter, r *http.Request) {
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// receive json
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var order Order
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err := app.readJSON(w, r, &order)
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if err != nil {
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app.badRequest(w, r, err)
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return
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}
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// generate a pdf invoice
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// create mail
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// send mail with attachment
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// send response
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var resp JSONResponse
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resp.OK = true
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resp.Message = fmt.Sprintf("Invoice %d.pdf created and sent to %s", order.ID, order.Email)
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app.writeJSON(w, http.StatusCreated, resp)
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}
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func (app *application) createInvoicePDF(order Order) error {
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pdf := gofpdf.New("P", "mm", "Letter", "")
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pdf.SetMargins(10, 13, 10)
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pdf.SetAutoPageBreak(true, 0)
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importer := gofpdi.NewImporter()
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t := importer.ImportPage(pdf, "./pdf-templates/invoice.pdf", q, "/MediaBox")
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pdf.AddPage()
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importer.UseImportedTemplate(pdf, t, 0, 0, 215.9, 0)
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pdf.SetY(20)
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// write info
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pdf.SetY(50)
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pdf.SetX(10)
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pdf.SetFont("Times", "", 11)
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pdf.CellFormat(
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97,
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8,
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fmt.Sprintf("Attention: %s %s", order.FirstName, order.LastName),
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"",
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0,
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"L",
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false,
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0,
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"",
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)
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pdf.Ln(5)
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pdf.CellFormat(
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97,
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8,
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order.Email,
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"",
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0,
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"L",
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false,
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0,
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"",
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)
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pdf.Ln(5)
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pdf.CellFormat(
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97,
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8,
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order.CreatedAt.Format("2005-01-02"),
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"",
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0,
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"L",
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false,
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0,
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"",
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)
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pdf.SetX(58)
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pdf.SetY(93)
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pdf.CellFormat(
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155,
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8,
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order.Product,
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"",
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0,
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"L",
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false,
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0,
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"",
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)
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pdf.SetX(166)
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pdf.CellFormat(
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20,
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8,
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fmt.Sprintf("%d", order.Quantity),
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"",
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0,
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"C",
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false,
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0,
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"",
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)
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pdf.SetX(185)
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pdf.CellFormat(
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155,
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8,
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fmt.Sprintf("€%.2f", float32(order.Amount/100.0)),
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"",
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0,
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"R",
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false,
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0,
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"",
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)
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invoicePath := fmt.Sprintf("./invoices/%d.pdf", order.ID)
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err := pdf.OutputFileAndClose(invoicePath)
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if err != nil {
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return err
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}
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return nil
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}
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23
cmd/micro/invoice/invoice-routes.go
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23
cmd/micro/invoice/invoice-routes.go
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@ -0,0 +1,23 @@
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package main
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import (
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"net/http"
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"github.com/go-chi/chi/v5"
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"github.com/go-chi/cors"
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)
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func (app *application) routes() http.Handler {
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mux := chi.NewRouter()
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mux.Use(cors.Handler(cors.Options{
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AllowedOrigins: []string{"https://*", "http://*"},
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AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
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AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
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AllowCredentials: false,
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MaxAge: 300,
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}))
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mux.Post("/invoice/create-and-send", app.CreateAndSendInvoice)
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return mux
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}
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79
cmd/micro/invoice/invoice.go
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79
cmd/micro/invoice/invoice.go
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@ -0,0 +1,79 @@
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package main
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import (
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"time"
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)
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const (
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version = "1.0.0"
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)
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type config struct {
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port int
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smtp struct {
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host string
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port int
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username string
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password string
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}
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frontend string
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}
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type application struct {
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config config
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infoLog *log.Logger
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errorLog *log.Logger
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version string
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}
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func (app *application) serve() error {
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srv := &http.Server{
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Addr: fmt.Sprintf(":%d", app.config.port),
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Handler: app.routes(),
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IdleTimeout: 30 * time.Second,
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ReadTimeout: 10 * time.Second,
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ReadHeaderTimeout: 5 * time.Second,
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WriteTimeout: 5 * time.Second,
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}
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app.infoLog.Printf(
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"Starting invoice microservice on port %d",
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app.config.port,
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)
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return srv.ListenAndServe()
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}
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func main() {
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var cfg config
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flag.IntVar(&cfg.port, "port", 5000, "Server port to listen on")
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flag.StringVar(&cfg.smtp.host, "smtphost", "0.0.0.0", "smtp host")
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flag.IntVar(&cfg.smtp.port, "smtpport", 1025, "smtp host")
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flag.StringVar(&cfg.smtp.username, "smtpuser", "user", "smtp user")
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flag.StringVar(&cfg.smtp.password, "smtppwd", "password", "smtp password")
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flag.StringVar(&cfg.frontend, "frontend", "http://localhost:4000", "frontend address")
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flag.Parse()
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infoLog := log.New(os.Stdout, "INFO\t", log.Ldate|log.Ltime)
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errorLog := log.New(os.Stdout, "ERROR\t", log.Ldate|log.Ltime|log.Lshortfile)
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app := &application{
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version: version,
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config: cfg,
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infoLog: infoLog,
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errorLog: errorLog,
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}
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app.CreateDirIfNotExist("./invoices")
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err := app.serve()
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if err != nil {
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log.Fatal(err)
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}
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}
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