rename "note revision" to just "revision"

src/services/revisions.js

@@ -0,0 +1,49 @@
+"use strict";
+
+const log = require('./log');
+const sql = require('./sql');
+const protectedSessionService = require("./protected_session");
+
+/**
+ * @param {BNote} note
+ */
+function protectRevisions(note) {
+    if (!protectedSessionService.isProtectedSessionAvailable()) {
+        throw new Error(`Cannot (un)protect revisions of note '${note.noteId}' without active protected session`);
+    }
+
+    for (const revision of note.getRevisions()) {
+        if (note.isProtected === revision.isProtected) {
+            continue;
+        }
+
+        try {
+            const content = revision.getContent();
+
+            revision.isProtected = note.isProtected;
+
+            // this will force de/encryption
+            revision.setContent(content, {forceSave: true});
+        } catch (e) {
+            log.error(`Could not un/protect note revision '${revision.revisionId}'`);
+
+            throw e;
+        }
+    }
+}
+
+function eraseRevisions(revisionIdsToErase) {
+    if (revisionIdsToErase.length === 0) {
+        return;
+    }
+
+    log.info(`Removing note revisions: ${JSON.stringify(revisionIdsToErase)}`);
+
+    sql.executeMany(`DELETE FROM revisions WHERE revisionId IN (???)`, revisionIdsToErase);
+    sql.executeMany(`UPDATE entity_changes SET isErased = 1 WHERE entityName = 'revisions' AND entityId IN (???)`, revisionIdsToErase);
+}
+
+module.exports = {
+    protectRevisions,
+    eraseRevisions
+};