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gotenbergPDF.go
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gotenbergPDF.go
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package renderer
import (
"bytes"
"context"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"strings"
"github.com/cortezaproject/corteza/server/system/types"
)
type (
gotenbergPDF struct {
url string
def DriverDefinition
}
gotenbergPDFDriver struct {
url string
}
)
// @todo healthcheck, different input data formats
func newGotenbergPDF(url string) driverFactory {
return &gotenbergPDF{
url: url,
def: DriverDefinition{
Name: "gotenbergPDF",
InputTypes: []types.DocumentType{
types.DocumentTypePlain,
types.DocumentTypeHTML,
},
OutputTypes: []types.DocumentType{
types.DocumentTypePDF,
},
},
}
}
func (d *gotenbergPDF) Define() DriverDefinition {
return d.def
}
func (d *gotenbergPDF) CanRender(t types.DocumentType) bool {
for _, i := range d.def.InputTypes {
if i == t {
return true
}
}
return false
}
func (d *gotenbergPDF) CanProduce(t types.DocumentType) bool {
for _, o := range d.def.OutputTypes {
if o == t {
return true
}
}
return false
}
func (d *gotenbergPDF) Driver() driver {
return &gotenbergPDFDriver{
url: d.url,
}
}
func (d *gotenbergPDFDriver) Render(ctx context.Context, pl *driverPayload) (io.ReadSeeker, error) {
// HTTP request body stuff
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
// index.html is required by the rendering container
part, err := writer.CreateFormFile("file", "index.html")
if err != nil {
return nil, err
}
err = d.prepareContent(part, pl)
if err != nil {
return nil, err
}
// Document configurations
err = d.applyOptions(writer, pl.Options)
if err != nil {
return nil, err
}
err = writer.Close()
if err != nil {
return nil, err
}
// HTTP request header stuff
// @todo make sure to use the propper endpoint when you add support
// for different inputs.
url := d.url
if n, has := pl.Options["url"]; has {
url = n
}
req, err := http.NewRequest("POST", url+"/convert/html", body)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", writer.FormDataContentType())
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
ss, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
defer resp.Body.Close()
return bytes.NewReader(ss), err
}
func (d *gotenbergPDFDriver) prepareContent(w io.Writer, pl *driverPayload) error {
t, err := preprocHTMLTemplate(pl)
if err != nil {
return err
}
return t.Execute(w, pl.Variables)
}
func (d *gotenbergPDFDriver) applyOptions(mw *multipart.Writer, opts map[string]string) (err error) {
if opts == nil {
return nil
}
for k, v := range opts {
switch k {
case "marginTop",
"marginBottom",
"marginLeft",
"marginRight":
err = d.addFormField(mw, k, v)
case "marginY":
err = d.addFormField(mw, "marginTop", v)
if err != nil {
return err
}
err = d.addFormField(mw, "marginBottom", v)
case "marginX":
err = d.addFormField(mw, "marginLeft", v)
if err != nil {
return err
}
err = d.addFormField(mw, "marginRight", v)
case "margin":
err = d.addFormField(mw, "marginTop", v)
if err != nil {
return err
}
err = d.addFormField(mw, "marginBottom", v)
if err != nil {
return err
}
err = d.addFormField(mw, "marginLeft", v)
if err != nil {
return err
}
err = d.addFormField(mw, "marginRight", v)
case "documentSize":
w, h := d.documentDimensions(v)
if w+h != "" {
err = d.addFormField(mw, "paperWidth", w)
if err != nil {
return err
}
err = d.addFormField(mw, "paperHeight", h)
}
case "documentWidth":
err = d.addFormField(mw, "paperWidth", v)
case "documentHeight":
err = d.addFormField(mw, "paperHeight", v)
case "contentScale":
err = d.addFormField(mw, "scale", v)
case "orientation":
if v == "landscape" {
err = d.addFormField(mw, "landscape", "true")
} else {
err = d.addFormField(mw, "landscape", "false")
}
}
if err != nil {
return err
}
}
return nil
}
func (d *gotenbergPDFDriver) addFormField(mw *multipart.Writer, k, v string) error {
w, err := mw.CreateFormField(k)
if err != nil {
return err
}
_, err = w.Write([]byte(v))
return err
}
// documentDimensions returns the ISO216 standard document dimensions in inches (Gotenberg uses inches)
func (d *gotenbergPDFDriver) documentDimensions(isoDoc string) (string, string) {
switch strings.ToLower(isoDoc) {
// A series
case "a0":
return "33.1", "46.8"
case "a1":
return "23.4", "33.1"
case "a2":
return "16.5", "23.4"
case "a3":
return "11.7", "16.5"
case "a4":
return "8.3", "11.7"
case "a5":
return "5.8", "8.3"
case "a6":
return "4.1", "5.8"
case "a7":
return "2.9", "4.1"
case "a8":
return "2.0", "2.9"
case "a9":
return "1.5", "2.0"
case "a10":
return "1.0", "1.5"
// B series
case "b0":
return "39.4", "55.7"
case "b1":
return "27.8", "39.4"
case "b2":
return "19.7", "27.8"
case "b3":
return "13.9", "19.7"
case "b4":
return "9.8", "13.9"
case "b5":
return "6.9", "9.8"
case "b6":
return "4.9", "6.9"
case "b7":
return "3.5", "4.9"
case "b8":
return "2.4", "3.5"
case "b9":
return "1.7", "2.4"
case "b10":
return "1.2", "1.7"
// C series
case "c0":
return "36.1", "51.1"
case "c1":
return "25.5", "36.1"
case "c2":
return "18.0", "25.5"
case "c3":
return "12.8", "18.0"
case "c4":
return "9.0", "12.8"
case "c5":
return "6.4", "9.0"
case "c6":
return "4.5", "6.4"
case "c7":
return "3.2", "4.5"
case "c8":
return "2.2", "3.2"
case "c9":
return "1.6", "2.2"
case "c10":
return "1.1", "1.6"
// ANSI
case "ansi a":
return "8.5", "11"
case "ansi b":
return "11", "17"
case "ansi c":
return "17", "22"
case "ansi d":
return "22", "34"
case "ansi e":
return "34", "44"
// Proprietary NA
case "junior legal":
return "8", "5"
case "letter":
return "8.5", "11"
case "legal":
return "8.5", "14"
case "tabloid":
return "11", "17"
}
// This will fallback to the default (A4)
return "", ""
}