downloading note revisions

src/routes/api/note_revisions.js

@@ -2,6 +2,9 @@
 
 const repository = require('../../services/repository');
 const noteCacheService = require('../../services/note_cache');
+const protectedSessionService = require('../../services/protected_session');
+const utils = require('../../services/utils');
+const path = require('path');
 
 async function getNoteRevisions(req) {
     const {noteId} = req.params;
@@ -16,15 +19,66 @@ async function getNoteRevisions(req) {
 async function getNoteRevision(req) {
     const noteRevision = await repository.getNoteRevision(req.params.noteRevisionId);
 
-    await noteRevision.getContent();
+    if (noteRevision.type !== 'file') {
+        await noteRevision.getContent();
 
-    if (noteRevision.content && ['file', 'image'].includes(noteRevision.type)) {
-        noteRevision.content = noteRevision.content.toString('base64');
+        if (noteRevision.content && noteRevision.type === 'image') {
+            noteRevision.content = noteRevision.content.toString('base64');
+        }
     }
 
     return noteRevision;
 }
 
+/**
+ * @param {NoteRevision} noteRevision
+ * @return {string}
+ */
+function getRevisionFilename(noteRevision) {
+    let filename = noteRevision.title || "untitled";
+
+    if (noteRevision.type === 'text') {
+        filename += '.html';
+    } else if (['relation-map', 'search'].includes(noteRevision.type)) {
+        filename += '.json';
+    }
+
+    const extension = path.extname(filename);
+    const date = noteRevision.dateCreated
+        .substr(0, 19)
+        .replace(' ', '_')
+        .replace(/[^0-9_]/g, '');
+
+    if (extension) {
+        filename = filename.substr(0, filename.length - extension.length)
+            + '-' + date + extension;
+    }
+    else {
+        filename += '-' + date;
+    }
+
+    return filename;
+}
+
+async function downloadNoteRevision(req, res) {
+    const noteRevision = await repository.getNoteRevision(req.params.noteRevisionId);
+
+    if (noteRevision.noteId !== req.params.noteId) {
+        return res.status(400).send(`Note revision ${req.params.noteRevisionId} does not belong to note ${req.params.noteId}`);
+    }
+
+    if (noteRevision.isProtected && !protectedSessionService.isProtectedSessionAvailable()) {
+        return res.status(401).send("Protected session not available");
+    }
+
+    const filename = getRevisionFilename(noteRevision);
+
+    res.setHeader('Content-Disposition', utils.getContentDisposition(filename));
+    res.setHeader('Content-Type', noteRevision.mime);
+
+    res.send(await noteRevision.getContent());
+}
+
 async function getEditedNotesOnDate(req) {
     const date = req.params.date;
 
@@ -48,5 +102,6 @@ async function getEditedNotesOnDate(req) {
 module.exports = {
     getNoteRevisions,
     getNoteRevision,
+    downloadNoteRevision,
     getEditedNotesOnDate
 };