feat(template): add multiple page support to templates

internal/routes/download.go

@@ -17,7 +17,7 @@ type downloadRequest struct {
 }
 
 type downloadResponse struct {
-	Url string
+	Urls []string
 }
 
 func DownloadSVG(w http.ResponseWriter, r *http.Request) {
@@ -73,16 +73,23 @@ func DownloadSVG(w http.ResponseWriter, r *http.Request) {
 		Keys: request.TemplateKeys,
 	}
 
-	filename, err := actions.ProvideFile(&templateParam, &convParam)
+	filenames, err := actions.ProvideFile(&templateParam, &convParam)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
-	urlparsed := getPublicUrl(r, filename)
-	log.Printf("Made %s available as %s\n", id, urlparsed)
-	response := downloadResponse{
-		Url: urlparsed,
+
+	urlsparsed := make([]string, len(filenames))
+	for i, filename := range filenames {
+		urlsparsed[i] = getPublicUrl(r, filename)
+		log.Printf("Made %s page %d available as %s\n", id, i, urlsparsed[i])
+
 	}
+
+	response := downloadResponse{
+		Urls: urlsparsed,
+	}
+
 	w.Header().Add("Content-Type", "application/json")
 	json, err := json.Marshal(response)
 	if err != nil {

pkg/svg/actions/download.go

@@ -3,20 +3,32 @@ package actions
 import (
 	"bytes"
 	"log"
+	"strconv"
 
 	"tomatentum.net/svg-templater/pkg/format"
 	"tomatentum.net/svg-templater/pkg/svg"
 )
 
-func ProvideFile(r *TemplateParameters, conversion *format.ConversionParameters) (string, error) {
-	templatedSvgblob, err := Template(r)
+func ProvideFile(r *TemplateParameters, conversion *format.ConversionParameters) ([]string, error) {
+	templatedPages, err := Template(r)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	log.Printf("Converting %s to format %s (w=%d,h=%d)", r.Id, conversion.Format, conversion.Width, conversion.Height)
-	result, err := format.ConvertByte(templatedSvgblob, *conversion)
-	if err != nil {
-		return "", err
+	filenames := make([]string, len(templatedPages))
+	for i, pagedata := range templatedPages {
+		result, err := format.ConvertByte(pagedata, *conversion)
+		if err != nil {
+			return nil, err
+		}
+		filenames[i], err = svg.Storage.CreatePublic(bytes.NewReader(result), strconv.Itoa(i+1), conversion.Format)
+
+		if err != nil {
+			return nil, err
+		}
+		log.Printf("Converted %s page %d to format %s (w=%d,h=%d)", r.Id, i, conversion.Format, conversion.Width, conversion.Height)
+
 	}
-	return svg.Storage.CreatePublic(bytes.NewReader(result), conversion.Format)
+
+	return filenames, nil
 }

pkg/svg/actions/page.go

@@ -3,6 +3,7 @@ package actions
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"log"
 	"regexp"
 	"strconv"
@@ -34,6 +35,18 @@ func AddPage(id string, svgbuf []byte) (svg.TemplatePage, error) {
 	return data, nil
 }
 
+func GetPage(id string, page int) ([]byte, error) {
+	file, err := svg.Storage.Get(fmt.Sprintf(FILEFORMAT, id, page))
+
+	if err != nil {
+		return nil, err
+	}
+
+	defer file.Close()
+
+	return io.ReadAll(file)
+}
+
 func DeletePage(id string, page int) (bool, error) {
 	if success, err := database.DeleteSVGPage(id, page); err != nil || !success {
 		return success, err

pkg/svg/actions/template.go

@@ -2,7 +2,6 @@ package actions
 
 import (
 	"errors"
-	"io"
 	"log"
 	"maps"
 	"regexp"
@@ -18,29 +17,42 @@ type TemplateParameters struct {
 	Keys map[string]string
 }
 
-func Template(r *TemplateParameters) ([]byte, error) {
-	mapkeys := slices.Collect(maps.Keys(r.Keys))
-	ok, err := verifyTemplate(r.Id, mapkeys)
+func Template(r *TemplateParameters) ([][]byte, error) {
+
+	data, err := database.GetSpecificSVG(r.Id)
+
 	if err != nil {
 		return nil, err
 	}
+
+	mapkeys := slices.Collect(maps.Keys(r.Keys))
+	ok, err := verifyTemplate(data, mapkeys)
+
+	if err != nil {
+		return nil, err
+	}
+
 	if !ok {
 		return nil, errors.New("Template does not exist.")
 	}
 	log.Printf("Replacing keys of %s template\n", r.Id)
 
-	reader, err := svg.Storage.Get(r.Id)
-	if err != nil {
-		return nil, err
+	pagesdata := make([][]byte, len(data.Pages))
+
+	for _, page := range data.Pages {
+		pagedata, err := GetPage(page.TemplateId, page.Page)
+
+		if err != nil {
+			return nil, err
+		}
+
+		replaceAll(&pagedata, r.Keys)
+		pagesdata[page.Page-1] = pagedata
+		log.Printf("Finished replacing keys of %s page %d\n", r.Id, page.Page)
+
 	}
-	defer reader.Close()
-	svgblob, err := io.ReadAll(reader)
-	if err != nil {
-		return nil, err
-	}
-	replaceAll(&svgblob, r.Keys)
 	log.Printf("Finished replacing keys of %s template\n", r.Id)
-	return svgblob, nil
+	return pagesdata, nil
 }
 
 func replaceAll(svgblob *[]byte, keys map[string]string) {
@@ -51,12 +63,7 @@ func replaceAll(svgblob *[]byte, keys map[string]string) {
 	}))
 }
 
-func verifyTemplate(id string, keys []string) (bool, error) {
-	data, err := database.GetSpecificSVG(id)
-	if err != nil {
-		return false, err
-	}
-
+func verifyTemplate(data svg.TemplateData, keys []string) (bool, error) {
 	for _, key := range data.AllKeys() {
 		if !slices.Contains(keys, key) {
 			return false, nil

pkg/svg/storage.go

@@ -2,6 +2,7 @@ package svg
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"log"
 	"net/http"
@@ -20,7 +21,7 @@ type SvgStorage interface {
 	AddFont(reader io.Reader, format string) error
 	GetFonts() ([]string, error)
 	GetFontsDir() string
-	CreatePublic(data io.Reader, filetype string) (string, error)
+	CreatePublic(data io.Reader, suffix string, filetype string) (string, error)
 	GetPublic(path string) (io.ReadCloser, error)
 	GetPublicDir() http.Dir
 }
@@ -86,13 +87,13 @@ func (f FileSvgStorage) List() ([]os.DirEntry, error) {
 	return os.ReadDir(f.basepath)
 }
 
-func (f FileSvgStorage) CreatePublic(data io.Reader, filetype string) (string, error) {
+func (f FileSvgStorage) CreatePublic(data io.Reader, suffix string, filetype string) (string, error) {
 	path := filepath.Join(f.basepath, f.publicSubPath)
 	if err := os.MkdirAll(path, 0755); err != nil {
 		return "", err
 	}
 
-	file, err := os.CreateTemp(path, "*."+filetype)
+	file, err := os.CreateTemp(path, fmt.Sprintf("*-%s."+filetype, suffix))
 	if err != nil {
 		return "", err
 	}