feat(exporter): PDF and MD support with txtpaper

pkg/exporter/all/all.go

@@ -5,4 +5,6 @@ import (
 	_ "github.com/ncarlier/readflow/pkg/exporter/html"
 	// activate EPUB exporter
 	_ "github.com/ncarlier/readflow/pkg/exporter/epub"
+	// activate txtpaper exporter
+	_ "github.com/ncarlier/readflow/pkg/exporter/txtpaper"
 )

pkg/exporter/txtpaper/txtpaper.go

@@ -0,0 +1,71 @@
+package txtpaper
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/ncarlier/readflow/pkg/exporter"
+	"github.com/ncarlier/readflow/pkg/model"
+)
+
+const txtpaperURL = "https://txtpaper.com/api/v1/"
+
+// TxtpaperExporter convert an article using txtpaper service
+type TxtpaperExporter struct {
+	format string
+}
+
+func newTxtpaperExporter(format string) func(downloader exporter.Downloader) (exporter.ArticleExporter, error) {
+	return func(downloader exporter.Downloader) (exporter.ArticleExporter, error) {
+		return &TxtpaperExporter{
+			format: format,
+		}, nil
+	}
+}
+
+// Export an article using txtpaper service
+func (exp *TxtpaperExporter) Export(ctx context.Context, article *model.Article) (*model.FileAsset, error) {
+	form := url.Values{}
+	form.Add("byline", *article.URL)
+	form.Add("content", *article.HTML)
+	form.Add("format", exp.format)
+
+	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
+	defer cancel()
+	req, err := http.NewRequestWithContext(ctx, "POST", txtpaperURL, strings.NewReader(form.Encode()))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode >= 400 {
+		return nil, fmt.Errorf("invalid txtpaper response: %d", res.StatusCode)
+	}
+
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return &model.FileAsset{
+		Data:        body,
+		ContentType: res.Header.Get("Content-Type"),
+		Name:        strings.TrimRight(article.Title, ". ") + "." + exp.format,
+	}, nil
+}
+
+func init() {
+	exporter.Register("pdf", newTxtpaperExporter("pdf"))
+	exporter.Register("md", newTxtpaperExporter("md"))
+	exporter.Register("mobi", newTxtpaperExporter("mobi"))
+}

ui/src/articles/components/context-menu/DownloadPanel.tsx

@@ -7,6 +7,8 @@ const formats = [
   { value: 'html-single', label: 'HTML file with images', icon: 'image' },
   { value: 'zip', label: 'ZIP file', icon: 'archive' },
   { value: 'epub', label: 'EPUB file', icon: 'menu_book' },
+  { value: 'pdf', label: 'PDF file', icon: 'picture_as_pdf' },
+  { value: 'md', label: 'Markdown file', icon: 'tag' },
 ]
 
 interface Props {

ui/src/settings/intergrations/outgoing-webhook/providers/S3ConfigForm.tsx

@@ -27,6 +27,8 @@ const formats: Map<string, string> = new Map([
   ['Single HTML file with images', 'html-single'],
   ['ZIP file with HTML and images', 'zip'],
   ['EPUB file', 'epub'],
+  ['PDF file', 'pdf'],
+  ['Markdown file', 'md'],
 ])
 
 const Formats = () => (