Closes #26466.

When JIRA or Redmine were enabled and the branch name did not match the
matching regular expression, the `issue_iid` would be `nil`, preventing
users from creating merge requests.

Closes #43193

Fixes #37438
Fixes gitaly#999

James Lopez authored 7 years ago and Robert Speicher committed 7 years ago

[10.4] Fix GH namespace security issue

Fixes #37439
Fixes gitaly#1000

Uses Lfs::FileModificationHandler to coordinate LFS detection, creation of LfsObject, etc

Caveats:
 1. This isn't used by the multi-file editor / Web IDE
 2. This isn't used on rename. We'd need to be able to download LFS files
    and add them to the commit if they no longer match so not as simple.
 3. We only check the root .gitattributes file, so this should be improved
    to correctly check for nested .gitattributes files in subfolders.

Currently we still need to run EnsureStageService within a transaction,
because when it runs within in a transaction we are going to stick to
the primary database when using database load balancing. Extracting this
out of the transaction makes it possible to hit into problems with
replication lag in pipeline commit status API, which can cause a lot of
trouble.

with .public_send we can't make sure that the scope on the model
actually exists.

Adds `#build_notification_recipients` to `NotificationRecipientService`
that returns the `NotificationRecipient` objects in order to be able to
access the new attribute `reason`.

This new attribute is used in the different notifier methods in order to
add the reason as a header: `X-GitLab-NotificationReason`.

Only the reason with the most priority gets sent.

Merge branch '41293-fix-command-injection-vulnerability-on-system_hook_push-queue-through-web-hook' into 'security-10-3'

Don't allow line breaks on HTTP headers

See merge request gitlab/gitlabhq!2277

(cherry picked from commit 7fc0a6fc096768a5604d6dd24d7d952e53300c82)

073b8f9c Don't allow line breaks on HTTP headers

check project access on MR create

See merge request gitlab/gitlabhq!2273

(cherry picked from commit 1fe2325d6ef2bced4c5e97b57691c894f38b2834)

43e85f49 check project access on MR create

Validate project path in Gitlab import - 10.3 port

See merge request gitlab/gitlabhq!2268

(cherry picked from commit 94c82376d66fc80d46dd2d5eeb5bade408ec6a7e)

2b94a7c2 Validate project path in Gitlab import