From 0d9fac7363d04fee2fab6f1fe6488aa5cd74badb Mon Sep 17 00:00:00 2001
From: Cory McWilliams <cory@unprompted.com>
Date: Wed, 22 Mar 2023 23:02:36 +0000
Subject: [PATCH] Support ?filename= to download a blob with a given filename.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4246 ed5197a5-7fde-0310-b194-c3ffbd925b24
---
 core/core.js | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/core/core.js b/core/core.js
index 5d08a187..76299d8b 100644
--- a/core/core.js
+++ b/core/core.js
@@ -1,5 +1,6 @@
-import * as auth from './auth.js';
 import * as app from './app.js';
+import * as auth from './auth.js';
+import * as form from './form.js';
 import * as httpd from './httpd.js';
 
 let gProcessIndex = 0;
@@ -629,11 +630,16 @@ async function blobHandler(request, response, blobId, uri) {
 	if (uri == "/view") {
 		let data;
 		let match;
+		let query = form.decodeForm(request.query);
+		let headers = {};
+		if (query.filename && query.filename.match(/^[A-Za-z0-9\.-]*$/)) {
+			headers['Content-Disposition'] = `attachment; filename=${query.filename}`;
+		}
 		if (match = /^\/\~(\w+)\/(\w+)$/.exec(blobId)) {
 			let id = await new Database(match[1]).get('path:' + match[2]);
 			if (id) {
 				if (request.headers['if-none-match'] === '"' + id + '"') {
-					response.writeHead(304, {});
+					response.writeHead(304, headers);
 					response.end();
 				} else {
 					data = await getBlobOrContent(id);
@@ -641,23 +647,23 @@ async function blobHandler(request, response, blobId, uri) {
 						let appObject = JSON.parse(data);
 						data = appObject.files[match[3]];
 					}
-					sendData(response, data, undefined, {etag: '"' + id + '"'});
+					sendData(response, data, undefined, Object.assign({etag: '"' + id + '"'}, headers));
 				}
 			} else {
 				if (request.headers['if-none-match'] === '"' + blobId + '"') {
-					response.writeHead(304, {});
+					response.writeHead(304, headers);
 					response.end();
 				} else {
-					sendData(response, data, undefined, {etag: '"' + blobId + '"'});
+					sendData(response, data, undefined, Object.assign({etag: '"' + blobId + '"'}, headers));
 				}
 			}
 		} else {
 			if (request.headers['if-none-match'] === '"' + blobId + '"') {
-				response.writeHead(304, {});
+				response.writeHead(304, headers);
 				response.end();
 			} else {
 				data = await getBlobOrContent(blobId);
-				sendData(response, data, undefined, {etag: '"' + blobId + '"'});
+				sendData(response, data, undefined, Object.assign({etag: '"' + blobId + '"'}, headers));
 			}
 		}
 	} else if (uri == "/save") {