gitlab-org--gitlab-foss/doc/development/internal_api.md

stage	group	info	type
Create	Source Code	To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments	reference, api

Internal API (FREE)

The internal API is used by different GitLab components, it can not be used by other consumers. This documentation is intended for people working on the GitLab codebase.

This documentation does not yet include the internal API used by GitLab Pages.

Adding new endpoints

API endpoints should be externally accessible by default, with proper authentication and authorization. Before adding a new internal endpoint, consider if the API would potentially be useful to the wider GitLab community and can be made externally accessible.

One reason we might favor internal API endpoints sometimes is when using such an endpoint requires internal data that external actors can not have. For example, in the internal Pages API we might use a secret token that identifies a request as internal or sign a request with a public key that is not available to a wider community.

Another reason to separate something into an internal API is when request to such API endpoint should never go through an edge (public) load balancer. This way we can configure different rate limiting rules and policies around how the endpoint is being accessed, because we know that only internal requests can be made to that endpoint going through an internal load balancer.

Authentication

These methods are all authenticated using a shared secret. This secret is stored in a file at the path configured in config/gitlab.yml by default this is in the root of the rails app named .gitlab_shell_secret

To authenticate using that token, clients read the contents of that file, and include the token Base64 encoded in a secret_token parameter or in the Gitlab-Shared-Secret header.

NOTE: The internal API used by GitLab Pages, and GitLab Kubernetes Agent Server (kas) uses JSON Web Token (JWT) authentication, which is different from GitLab Shell.

Git Authentication

This is called by Gitaly and GitLab Shell to check access to a repository.

• When called from GitLab Shell: No changes are passed, and the internal API replies with the information needed to pass the request on to Gitaly.
• When called from Gitaly in a pre-receive hook: The changes are passed and validated to determine if the push is allowed.

Calls are limited to 50 seconds each.

POST /internal/allowed

Attribute	Type	Required	Description
key_id	string	no	ID of the SSH-key used to connect to GitLab Shell
username	string	no	Username from the certificate used to connect to GitLab Shell
project	string	no (if gl_repository is passed)	Path to the project
gl_repository	string	no (if project is passed)	Repository identifier, such as project-7
protocol	string	yes	SSH when called from GitLab Shell, HTTP or SSH when called from Gitaly
action	string	yes	Git command being run (git-upload-pack, git-receive-pack, git-upload-archive)
changes	string	yes	<oldrev> <newrev> <refname> when called from Gitaly, the magic string _any when called from GitLab Shell
check_ip	string	no	IP address from which call to GitLab Shell was made

Example request:

curl --request POST --header "Gitlab-Shared-Secret: <Base64 encoded token>" --data "key_id=11&project=gnuwget/wget2&action=git-upload-pack&protocol=ssh" "http://localhost:3001/api/v4/internal/allowed"

Example response:

{
  "status": true,
  "gl_repository": "project-3",
  "gl_project_path": "gnuwget/wget2",
  "gl_id": "user-1",
  "gl_username": "root",
  "git_config_options": [],
  "gitaly": {
    "repository": {
      "storage_name": "default",
      "relative_path": "@hashed/4e/07/4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce.git",
      "git_object_directory": "",
      "git_alternate_object_directories": [],
      "gl_repository": "project-3",
      "gl_project_path": "gnuwget/wget2"
    },
    "address": "unix:/Users/bvl/repos/gitlab/gitaly.socket",
    "token": null
  },
  "gl_console_messages": []
}

Known consumers

• Gitaly
• GitLab Shell

LFS Authentication

This is the endpoint that gets called from GitLab Shell to provide information for LFS clients when the repository is accessed over SSH.

Attribute	Type	Required	Description
key_id	string	no	ID of the SSH-key used to connect to GitLab Shell
username	string	no	Username from the certificate used to connect to GitLab Shell
project	string	no	Path to the project

Example request:

curl --request POST --header "Gitlab-Shared-Secret: <Base64 encoded token>" --data "key_id=11&project=gnuwget/wget2" "http://localhost:3001/api/v4/internal/lfs_authenticate"

{
  "username": "root",
  "lfs_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJkYXRhIjp7ImFjdG9yIjoicm9vdCJ9LCJqdGkiOiIyYWJhZDcxZC0xNDFlLTQ2NGUtOTZlMi1mODllYWRiMGVmZTYiLCJpYXQiOjE1NzAxMTc2NzYsIm5iZiI6MTU3MDExNzY3MSwiZXhwIjoxNTcwMTE5NDc2fQ.g7atlBw1QMY7QEBVPE0LZ8ZlKtaRzaMRmNn41r2YITM",
  "repository_http_path": "http://localhost:3001/gnuwget/wget2.git",
  "expires_in": 1800
}

Known consumers

• GitLab Shell

Authorized Keys Check

This endpoint is called by the GitLab Shell authorized keys check. Which is called by OpenSSH for fast SSH key lookup.

Attribute	Type	Required	Description
key	string	yes	SSH key as passed by OpenSSH to GitLab Shell

GET /internal/authorized_keys

Example request:

curl --request GET --header "Gitlab-Shared-Secret: <Base64 encoded secret>" "http://localhost:3001/api/v4/internal/authorized_keys?key=<key as passed by OpenSSH>"

Example response:

{
  "id": 11,
  "title": "admin@example.com",
  "key": "ssh-rsa ...",
  "created_at": "2019-06-27T15:29:02.219Z"
}

Known consumers

• GitLab Shell

Get user for user ID or key

This endpoint is used when a user performs ssh git@gitlab.com. It discovers the user associated with an SSH key.

Attribute	Type	Required	Description
key_id	integer	no	The ID of the SSH key used as found in the authorized-keys file or through the /authorized_keys check
username	string	no	Username of the user being looked up, used by GitLab Shell when authenticating using a certificate

GET /internal/discover

Example request:

curl --request GET --header "Gitlab-Shared-Secret: <Base64 encoded secret>" "http://localhost:3001/api/v4/internal/discover?key_id=7"

Example response:

{
  "id": 7,
  "name": "Dede Eichmann",
  "username": "rubi"
}

Known consumers

• GitLab Shell

Instance information

This gets some generic information about the instance. This is used by Geo nodes to get information about each other.

GET /internal/check

Example request:

curl --request GET --header "Gitlab-Shared-Secret: <Base64 encoded secret>" "http://localhost:3001/api/v4/internal/check"

Example response:

{
  "api_version": "v4",
  "gitlab_version": "12.3.0-pre",
  "gitlab_rev": "d69c988e6a6",
  "redis": true
}

Known consumers

• GitLab Geo
• GitLab Shell's bin/check
• Gitaly

Get new 2FA recovery codes using an SSH key

This is called from GitLab Shell and allows users to get new 2FA recovery codes based on their SSH key.

Attribute	Type	Required	Description
key_id	integer	no	The ID of the SSH key used as found in the authorized-keys file or through the /authorized_keys check
user_id	integer	no	Deprecated User_id for which to generate new recovery codes

GET /internal/two_factor_recovery_codes

Example request:

curl --request POST --header "Gitlab-Shared-Secret: <Base64 encoded secret>" --data "key_id=7" "http://localhost:3001/api/v4/internal/two_factor_recovery_codes"

Example response:

{
  "success": true,
  "recovery_codes": [
    "d93ee7037944afd5",
    "19d7b84862de93dd",
    "1e8c52169195bf71",
    "be50444dddb7ca84",
    "26048c77d161d5b7",
    "482d5c03d1628c47",
    "d2c695e309ce7679",
    "dfb4748afc4f12a7",
    "0e5f53d1399d7979",
    "af04d5622153b020"
  ]
}

Known consumers

• GitLab Shell

Get new personal access-token

This is called from GitLab Shell and allows users to generate a new personal access token.

Attribute	Type	Required	Description
name	string	yes	The name of the new token
scopes	string array	yes	The authorization scopes for the new token, these must be valid token scopes
expires_at	string	no	The expiry date for the new token
key_id	integer	no	The ID of the SSH key used as found in the authorized-keys file or through the /authorized_keys check
user_id	integer	no	User_id for which to generate the new token

POST /internal/personal_access_token

Example request:

curl --request POST --header "Gitlab-Shared-Secret: <Base64 encoded secret>" --data "user_id=29&name=mytokenname&scopes[]=read_user&scopes[]=read_repository&expires_at=2020-07-24" "http://localhost:3001/api/v4/internal/personal_access_token"

Example response:

{
  "success": true,
  "token": "Hf_79B288hRv_3-TSD1R",
  "scopes": ["read_user","read_repository"],
  "expires_at": "2020-07-24"
}

Known consumers

• GitLab Shell

Incrementing counter on pre-receive

This is called from the Gitaly hooks increasing the reference counter for a push that might be accepted.

Attribute	Type	Required	Description
gl_repository	string	yes	repository identifier for the repository receiving the push

POST /internal/pre_receive

Example request:

curl --request POST --header "Gitlab-Shared-Secret: <Base64 encoded secret>" --data "gl_repository=project-7" "http://localhost:3001/api/v4/internal/pre_receive"

Example response:

{
  "reference_counter_increased": true
}

PostReceive

Called from Gitaly after a receiving a push. This triggers the PostReceive-worker in Sidekiq, processes the passed push options and builds the response including messages that need to be displayed to the user.

Attribute	Type	Required	Description
identifier	string	yes	user-[id] or key-[id] Identifying the user performing the push
gl_repository	string	yes	identifier of the repository being pushed to
push_options	string array	no	array of push options
changes	string	no	refs to be updated in the push in the format oldrev newrev refname\n.

POST /internal/post_receive

Example Request:

curl --request POST --header "Gitlab-Shared-Secret: <Base64 encoded secret>" --data "gl_repository=project-7" --data "identifier=user-1" --data "changes=0000000000000000000000000000000000000000 fd9e76b9136bdd9fe217061b497745792fe5a5ee gh-pages\n" "http://localhost:3001/api/v4/internal/post_receive"

Example response:

{
  "messages": [
    {
      "message": "Hello from post-receive",
      "type": "alert"
    }
  ],
  "reference_counter_decreased": true
}

Kubernetes agent endpoints

• Introduced in GitLab 13.4.
• This feature is not deployed on GitLab.com
• It's not recommended for production use.

The following endpoints are used by the GitLab Kubernetes Agent Server (kas) for various purposes.

These endpoints are all authenticated using JWT. The JWT secret is stored in a file specified in config/gitlab.yml. By default, the location is in the root of the GitLab Rails app in a file called .gitlab_kas_secret.

WARNING: The Kubernetes agent is under development and is not recommended for production use.

Kubernetes agent information

Called from GitLab Kubernetes Agent Server (kas) to retrieve agent information for the given agent token. This returns the Gitaly connection information for the agent's project in order for kas to fetch and update the agent's configuration.

GET /internal/kubernetes/agent_info

Example Request:

curl --request GET --header "Gitlab-Kas-Api-Request: <JWT token>" --header "Authorization: Bearer <agent token>" "http://localhost:3000/api/v4/internal/kubernetes/agent_info"

Kubernetes agent project information

Called from GitLab Kubernetes Agent Server (kas) to retrieve project information for the given agent token. This returns the Gitaly connection for the requested project. GitLab kas uses this to configure the agent to fetch Kubernetes resources from the project repository to sync.

Only public projects are supported. For private projects, the ability for the agent to be authorized is not yet implemented.

Attribute	Type	Required	Description
id	integer/string	yes	The ID or URL-encoded path of the project

GET /internal/kubernetes/project_info

Example Request:

curl --request GET --header "Gitlab-Kas-Api-Request: <JWT token>" --header "Authorization: Bearer <agent token>" "http://localhost:3000/api/v4/internal/kubernetes/project_info?id=7"

Kubernetes agent usage metrics

Called from GitLab Kubernetes Agent Server (kas) to increase the usage metric counters.

Attribute	Type	Required	Description
gitops_sync_count	integer	no	The number to increase the gitops_sync_count counter by
k8s_api_proxy_request_count	integer	no	The number to increase the k8s_api_proxy_request_count counter by

POST /internal/kubernetes/usage_metrics

Example Request:

curl --request POST --header "Gitlab-Kas-Api-Request: <JWT token>" --header "Content-Type: application/json" --data '{"gitops_sync_count":1}' "http://localhost:3000/api/v4/internal/kubernetes/usage_metrics"

Kubernetes agent alert metrics

Called from GitLab Kubernetes Agent Server (KAS) to save alerts derived from Cilium on Kubernetes Cluster.

Attribute	Type	Required	Description
alert	Hash	yes	Alerts detail. Same format as 3rd party alert.

POST internal/kubernetes/modules/cilium_alert

Example Request:

curl --request POST   --header "Gitlab-Kas-Api-Request: <JWT token>" --header "Authorization: Bearer <agent token>" --header "Content-Type: application/json" --data '"{\"alert\":{\"title\":\"minimal\",\"message\":\"network problem\",\"evalMatches\":[{\"value\":1,\"metric\":\"Count\",\"tags\":{}}]}}"' "http://localhost:3000/api/v4/internal/kubernetes/modules/cilium_alert"

Subscriptions

The subscriptions endpoint is used by CustomersDot (customers.gitlab.com) in order to apply subscriptions including trials, and add-on purchases, for personal namespaces or top-level groups within GitLab.com.

Creating a subscription

Use a POST to create a subscription.

POST /namespaces/:id/gitlab_subscription

Attribute	Type	Required	Description
start_date	date	yes	Start date of subscription
end_date	date	no	End date of subscription
plan_code	string	no	Subscription tier code
seats	integer	no	Number of seats in subscription
max_seats_used	integer	no	Highest number of active users in the last month
auto_renew	boolean	no	Whether subscription auto-renews on end date
trial	boolean	no	Whether subscription is a trial
trial_starts_on	date	no	Start date of trial
trial_ends_on	date	no	End date of trial

Example request:

curl --request POST --header "TOKEN: <admin_access_token>" "https://gitlab.com/api/v4/namespaces/1234/gitlab_subscription?start_date="2020-07-15"&plan="silver"&seats=10"

Example response:

{
  "plan": {
    "code":"silver",
    "name":"Silver",
    "trial":false,
    "auto_renew":null,
    "upgradable":false
  },
  "usage": {
    "seats_in_subscription":10,
    "seats_in_use":1,
    "max_seats_used":0,
    "seats_owed":0
  },
  "billing": {
    "subscription_start_date":"2020-07-15",
    "subscription_end_date":null,
    "trial_ends_on":null
  }
}

Updating a subscription

Use a PUT command to update an existing subscription.

PUT /namespaces/:id/gitlab_subscription

Attribute	Type	Required	Description
start_date	date	no	Start date of subscription
end_date	date	no	End date of subscription
plan_code	string	no	Subscription tier code
seats	integer	no	Number of seats in subscription
max_seats_used	integer	no	Highest number of active users in the last month
auto_renew	boolean	no	Whether subscription auto-renews on end date
trial	boolean	no	Whether subscription is a trial
trial_starts_on	date	no	Start date of trial. Required if trial is true.
trial_ends_on	date	no	End date of trial

Example request:

curl --request PUT --header "TOKEN: <admin_access_token>" "https://gitlab.com/api/v4/namespaces/1234/gitlab_subscription?max_seats_used=0"

Example response:

{
  "plan": {
    "code":"silver",
    "name":"Silver",
    "trial":false,
    "auto_renew":null,
    "upgradable":false
  },
  "usage": {
    "seats_in_subscription":80,
    "seats_in_use":82,
    "max_seats_used":0,
    "seats_owed":2
  },
  "billing": {
    "subscription_start_date":"2020-07-15",
    "subscription_end_date":"2021-07-15",
    "trial_ends_on":null
  }
}

Retrieving a subscription

Use a GET command to view an existing subscription.

GET /namespaces/:id/gitlab_subscription

Example request:

curl --header "TOKEN: <admin_access_token>" "https://gitlab.com/api/v4/namespaces/1234/gitlab_subscription"

Example response:

{
  "plan": {
    "code":"silver",
    "name":"Silver",
    "trial":false,
    "auto_renew":null,
    "upgradable":false
  },
  "usage": {
    "seats_in_subscription":80,
    "seats_in_use":82,
    "max_seats_used":82,
    "seats_owed":2
  },
  "billing": {
    "subscription_start_date":"2020-07-15",
    "subscription_end_date":"2021-07-15",
    "trial_ends_on":null
  }
}

Known consumers

• CustomersDot