Use send-range and mime packages to send multipart/byteranges responses

package.json

@@ -26,6 +26,7 @@
     "@types/feather-icons": "^4.7.0",
     "@types/formidable": "^1.0.31",
     "@types/jest": "^26.0.4",
+    "@types/mime": "^2.0.3",
     "@types/mysql": "^2.15.15",
     "@types/node": "^14.6.3",
     "@types/nodemailer": "^6.4.0",
@@ -60,6 +61,8 @@
   "dependencies": {
     "config": "^3.3.1",
     "express": "^4.17.1",
+    "mime": "^2.4.6",
+    "send-ranges": "^4.0.0",
     "swaf": "^0.22.5"
   }
 }

src/controllers/GiteaRepoLatestReleaseController.ts

@@ -7,6 +7,8 @@ import {NotFoundHttpError, ServiceUnavailableHttpError} from "swaf/HttpError";
 import * as fs from "fs";
 import {promisify} from "util";
 import path from "path";
+import sendRanges, {SendRangeGetStreamFn} from "send-ranges";
+import mime from "mime";
 
 export const ASSETS_BASE_DIR = config.get<string>('assets_base_dir');
 
@@ -110,8 +112,25 @@ export default class GiteaRepoLatestReleaseController extends Controller {
             await promisify(fs.rename)(tmpAssetPath, assetPath);
         }
 
-        // Respond
+        log.debug('Download', assetPath, downloadProperties.asset.name);
-        return res.download(assetPath, downloadProperties.asset.name);
+
+        sendRanges(async _ => {
+            const filePath = assetPath;
+            const getStream: SendRangeGetStreamFn = range => fs.createReadStream(filePath, range);
+            const type = mime.getType(downloadProperties.asset.name) || 'application/json';
+            const stats = await promisify(fs.stat)(filePath);
+
+            return {getStream, type, size: stats.size};
+        }, {
+            maxRanges: 1024,
+        })(req, res, (err: unknown) => {
+            if (err) return next(err);
+
+            log.info('Fallback to express download.');
+
+            // Respond
+            return res.download(assetPath, downloadProperties.asset.name);
+        });
     }
 }
 

src/types/send-ranges.d.ts

@@ -0,0 +1,24 @@
+declare module 'send-ranges' {
+    import {NextFunction, Request, RequestHandler} from "express";
+    import {ReadStream} from "fs";
+    export default function (
+        fetchStream: ((req: Request) => Promise<SendRangeParams | null>),
+        options: SendRangeOptions = {},
+    ): RequestHandler;
+
+    export type SendRangeOptions = {
+        beforeSend?: (info, next: NextFunction) => void,
+        maxRanges?: number,
+    };
+
+    export type SendRangeParams = {
+        getStream: SendRangeGetStreamFn;
+        type: string;
+        size: number;
+    };
+
+    export type SendRangeGetStreamFn = (range: {
+        start?: number;
+        end?: number;
+    }) => ReadStream;
+}

yarn.lock

@@ -1281,7 +1281,7 @@
   resolved "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.6.tgz#f4c7ec43e81b319a9815115031709f26987891f0"
   integrity sha512-3c+yGKvVP5Y9TYBEibGNR+kLtijnj7mYrXRg+WpFb2X9xm04g/DXYkfg4hmzJQosc9snFNUPkbYIhu+KAm6jJw==
 
-"@types/mime@*":
+"@types/mime@*", "@types/mime@^2.0.3":
   version "2.0.3"
   resolved "https://registry.npmjs.org/@types/mime/-/mime-2.0.3.tgz#c893b73721db73699943bfc3653b1deb7faa4a3a"
   integrity sha512-Jus9s4CDbqwocc5pOAnh8ShfrnMcPHuJYzVcSUU7lrh8Ni5HuIqX3oilL86p3dlTrk0LzHRCgA/GQ7uNCw6l2Q==
@@ -2212,6 +2212,14 @@ buffer@^5.2.1:
     base64-js "^1.3.1"
     ieee754 "^1.1.13"
 
+byte-range-stream@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.npmjs.org/byte-range-stream/-/byte-range-stream-2.0.1.tgz#bf62271ddd07c2dad3bf9feee5f1f3ff1a96938a"
+  integrity sha512-qifcJeL6kLv7GfJk/2h27/3VmU046AFrt6PWJ9hxrvP9A2IHHEGIC9cFvgEMRKIZjkd5Z56kKukQ7nzIBp5cuQ==
+  dependencies:
+    combined-stream "^1.0.5"
+    range-parser "^1.2.0"
+
 bytes@3.0.0:
   version "3.0.0"
   resolved "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz#d32815404d689699f85a4ea4fa8755dd13a96048"
@@ -2547,7 +2555,7 @@ colors@^1.1.2:
   resolved "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz#c50491479d4c1bdaed2c9ced32cf7c7dc2360f78"
   integrity sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA==
 
-combined-stream@^1.0.6, combined-stream@~1.0.6:
+combined-stream@^1.0.5, combined-stream@^1.0.6, combined-stream@~1.0.6:
   version "1.0.8"
   resolved "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz#c3d45a8b34fd730631a110a8a2520682b31d5a7f"
   integrity sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==
@@ -7432,7 +7440,7 @@ randombytes@^2.1.0:
   dependencies:
     safe-buffer "^5.1.0"
 
-range-parser@~1.2.1:
+range-parser@^1.2.0, range-parser@^1.2.1, range-parser@~1.2.1:
   version "1.2.1"
   resolved "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz#3cf37023d199e1c24d1a55b84800c2f3e6468031"
   integrity sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==
@@ -7974,6 +7982,15 @@ semver@^6.0.0, semver@^6.2.0, semver@^6.3.0:
   resolved "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
+send-ranges@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.npmjs.org/send-ranges/-/send-ranges-4.0.0.tgz#b5fd5e8f324d31ad48eef3c2e7a9fdca6c973197"
+  integrity sha512-BwhMXcHIwxCAo8P7RHbLz1PlASAvTiIAL9cV8oZxBATa8WZTJy1cZn4RBlA62pJZly6L/x+97baWhKhsp0Uh0Q==
+  dependencies:
+    byte-range-stream "^2.0.1"
+    pump "^3.0.0"
+    range-parser "^1.2.1"
+
 send@0.17.1:
   version "0.17.1"
   resolved "https://registry.npmjs.org/send/-/send-0.17.1.tgz#c1d8b059f7900f7466dd4938bdc44e11ddb376c8"