feature: initial syndication feeds support

Provides rss 2.0, atom 1.0 and json 1.0 feeds for videos (instance and account-wide) on listings and video-watch views.

* still lacks redis caching
* still lacks lastBuildDate support
* still lacks channel-wide support
* still lacks semantic annotation (for licenses, NSFW warnings, etc.)
* still lacks love ( ˘ ³˘)

* RSS: has MRSS support for torrent lists!
* RSS: includes the first torrent in an enclosure
* JSON: lists all torrents in the 'attachments' object
* ATOM: lacking torrent listing support

Advances #23
Partial implementation for the accountId generation in the client, which will need a hotfix to add a way to get the proper account id.

2 files changed, 36 insertions, 0 deletions

diff --git a/server/middlewares/validators/feeds.ts b/server/middlewares/validators/feeds.ts
new file mode 100644
index 000000000..6a8cfce86
--- /dev/null
+++ b/server/middlewares/validators/feeds.ts
@@ -0,0 +1,35 @@
+import * as express from 'express'
+import { param, query } from 'express-validator/check'
+import { isAccountIdExist, isAccountNameValid, isLocalAccountNameExist } from '../../helpers/custom-validators/accounts'
+import { join } from 'path'
+import { isIdOrUUIDValid } from '../../helpers/custom-validators/misc'
+import { logger } from '../../helpers/logger'
+import { areValidationErrors } from './utils'
+import { isValidRSSFeed } from '../../helpers/custom-validators/feeds'
+
+const feedsValidator = [
+  param('format').optional().custom(isValidRSSFeed).withMessage('Should have a valid format (rss, atom, json)'),
+  query('format').optional().custom(isValidRSSFeed).withMessage('Should have a valid format (rss, atom, json)'),
+  query('accountId').optional().custom(isIdOrUUIDValid),
+  query('accountName').optional().custom(isAccountNameValid),
+
+  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    logger.debug('Checking feeds parameters', { parameters: req.query })
+
+    if (areValidationErrors(req, res)) return
+
+    if (req.query.accountId) {
+      if (!await isAccountIdExist(req.query.accountId, res)) return
+    } else if (req.query.accountName) {
+      if (!await isLocalAccountNameExist(req.query.accountName, res)) return
+    }
+
+    return next()
+  }
+]
+
+// ---------------------------------------------------------------------------
+
+export {
+  feedsValidator
+}
diff --git a/server/middlewares/validators/index.ts b/server/middlewares/validators/index.ts
index 9840e8f65..b69e1f14b 100644
--- a/server/middlewares/validators/index.ts
+++ b/server/middlewares/validators/index.ts
@@ -3,6 +3,7 @@ export * from './oembed'
 export * from './activitypub'
 export * from './pagination'
 export * from './follows'
+export * from './feeds'
 export * from './sort'
 export * from './users'
 export * from './videos'