Initial commit

Assisted-by: GLM 5.3

internal/admin/posts_import.go

@@ -0,0 +1,92 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
+
+package admin
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"path/filepath"
+	"strings"
+
+	"sourcedock.dev/petrbalvin/volumen/internal/i18n"
+	"sourcedock.dev/petrbalvin/volumen/internal/payloads"
+	"sourcedock.dev/petrbalvin/volumen/internal/post"
+)
+
+func (a *Admin) handleImportForm(w http.ResponseWriter, r *http.Request) {
+	data := a.pageData(r)
+	data.Crumbs = []Crumb{
+		{Label: "Posts", Href: "/admin/", UI: true},
+		{Label: "Import", IsLast: true, UI: true},
+	}
+	a.renderPage(w, r, "import.html", data, http.StatusOK)
+}
+
+func (a *Admin) handleImport(w http.ResponseWriter, r *http.Request) {
+	if !a.requireCSRF(w, r) {
+		return
+	}
+	data := a.pageData(r)
+	data.Crumbs = []Crumb{
+		{Label: "Posts", Href: "/admin/", UI: true},
+		{Label: "Import", IsLast: true, UI: true},
+	}
+	fail := func(msg string) {
+		data.Error = i18n.Admin.T(data.Lang, msg)
+		a.renderPage(w, r, "import.html", data, http.StatusUnprocessableEntity)
+	}
+
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		fail("No file selected.")
+		return
+	}
+	defer file.Close()
+	if !strings.HasSuffix(strings.ToLower(header.Filename), ".md") {
+		fail("Only .md files are accepted.")
+		return
+	}
+	raw, err := readLimited(file, int64(a.deps.Config.Admin.MaxUploadBytes))
+	if err != nil {
+		fail("File is too large.")
+		return
+	}
+	content := string(raw)
+	p, err := post.Parse(content)
+	if err != nil {
+		fail(i18n.Admin.Tf(data.Lang, "The file could not be read as a post: %s", err.Error()))
+		return
+	}
+	if p.Slug() == "" {
+		base := strings.ToLower(filepath.Base(header.Filename))
+		stem := strings.TrimSuffix(base, filepath.Ext(base))
+		p.Metadata.Set("slug", strings.ReplaceAll(stem, " ", "-"))
+	}
+	if p.Lang() == "" {
+		p.Metadata.Set("lang", a.deps.Config.Site.Language)
+	}
+	if err := payloads.CreationError(p, a.deps.Store, nil); err != nil {
+		fail(err.Error())
+		return
+	}
+	if _, err := a.deps.Store.Save(p); err != nil {
+		fail("Import failed.")
+		return
+	}
+	http.Redirect(w, r, "/admin/posts/"+p.Slug()+"/edit", http.StatusSeeOther)
+}
+
+// readLimited reads at most limit+1 bytes so callers can detect
+// oversize uploads.
+func readLimited(r io.Reader, limit int64) ([]byte, error) {
+	raw, err := io.ReadAll(io.LimitReader(r, limit+1))
+	if err != nil {
+		return nil, err
+	}
+	if int64(len(raw)) > limit {
+		return nil, fmt.Errorf("payload too large")
+	}
+	return raw, nil
+}