Add pages domains API documentation

doc/api/README.md

@@ -37,6 +37,7 @@ following locations:
 - [Notes](notes.md) (comments)
 - [Notification settings](notification_settings.md)
 - [Open source license templates](templates/licenses.md)
+- [Pages Domains](pages_domains.md)
 - [Pipelines](pipelines.md)
 - [Pipeline Triggers](pipeline_triggers.md)
 - [Pipeline Schedules](pipeline_schedules.md)

doc/api/pages_domains.md

+# Pages domains API
+
+Endpoints for connecting custom domain(s) and TLS certificates in [GitLab Pages](https://about.gitlab.com/features/pages/).
+
+The GitLab Pages feature must be enabled to use these endpoints. Find out more about [administering](../administration/pages/index.md) and [using](../user/project/pages/index.md) the feature.
+
+## List pages domains
+
+Get a list of project pages domains. The user must have permissions to view pages domains.
+
+```http
+GET /projects/:id/pages/domains
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `id`      | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/5/pages/domains
+```
+
+```json
+[
+  {
+    "domain": "www.domain.example",
+    "url": "http://www.domain.example"
+  },
+  {
+    "domain": "ssl.domain.example",
+    "url": "https://ssl.domain.example",
+    "certificate": {
+      "subject": "/O=Example, Inc./OU=Example Origin CA/CN=Example Origin Certificate",
+      "expired": false,
+      "certificate": "-----BEGIN CERTIFICATE-----\n … \n-----END CERTIFICATE-----",
+      "certificate_text": "Certificate:\n … \n"
+    }
+  }
+]
+```
+
+## Single pages domain
+
+Get a single project pages domain. The user must have permissions to view pages domains.
+
+```http
+GET /projects/:id/pages/domains/:domain
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `id`      | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `domain`  | string         | yes      | The domain                               |
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/5/pages/domains/www.domain.example
+```
+
+```json
+{
+  "domain": "www.domain.example",
+  "url": "http://www.domain.example"
+}
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/5/pages/domains/ssl.domain.example
+```
+
+```json
+{
+  "domain": "ssl.domain.example",
+  "url": "https://ssl.domain.example",
+  "certificate": {
+    "subject": "/O=Example, Inc./OU=Example Origin CA/CN=Example Origin Certificate",
+    "expired": false,
+    "certificate": "-----BEGIN CERTIFICATE-----\n … \n-----END CERTIFICATE-----",
+    "certificate_text": "Certificate:\n … \n"
+  }
+}
+```
+
+## Create new pages domain
+
+Creates a new pages domain. The user must have permissions to create new pages domains.
+
+```http
+POST /projects/:id/pages/domains
+```
+
+| Attribute     | Type           | Required | Description                              |
+| ------------- | -------------- | -------- | ---------------------------------------- |
+| `id`          | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `domain`      | string         | yes      | The domain                               |
+| `certificate` | file/string    | no       | The certificate in PEM format with intermediates following in most specific to least specific order.|
+| `key`         | file/string    | no       | The certificate key in PEM format.       |
+
+```bash
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form="domain=ssl.domain.example" --form="certificate=@/path/to/cert.pem" --form="key=@/path/to/key.pem" https://gitlab.example.com/api/v4/projects/5/pages/domains
+```
+
+```bash
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form="domain=ssl.domain.example" --form="certificate=$CERT_PEM" --form="key=$KEY_PEM" https://gitlab.example.com/api/v4/projects/5/pages/domains
+```
+
+```json
+{
+  "domain": "ssl.domain.example",
+  "url": "https://ssl.domain.example",
+  "certificate": {
+    "subject": "/O=Example, Inc./OU=Example Origin CA/CN=Example Origin Certificate",
+    "expired": false,
+    "certificate": "-----BEGIN CERTIFICATE-----\n … \n-----END CERTIFICATE-----",
+    "certificate_text": "Certificate:\n … \n"
+  }
+}
+```
+
+## Update pages domain
+
+Updates an existing project pages domain. The user must have permissions to change an existing pages domains.
+
+```http
+PUT /projects/:id/pages/domains/:domain
+```
+
+| Attribute     | Type           | Required | Description                              |
+| ------------- | -------------- | -------- | ---------------------------------------- |
+| `id`          | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `domain`      | string         | yes      | The domain                               |
+| `certificate` | file/string    | no       | The certificate in PEM format with intermediates following in most specific to least specific order.|
+| `key`         | file/string    | no       | The certificate key in PEM format.       |
+
+```bash
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form="certificate=@/path/to/cert.pem" --form="key=@/path/to/key.pem" https://gitlab.example.com/api/v4/projects/5/pages/domains/ssl.domain.example
+```
+
+```bash
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form="certificate=$CERT_PEM" --form="key=$KEY_PEM" https://gitlab.example.com/api/v4/projects/5/pages/domains/ssl.domain.example
+```
+
+```json
+{
+  "domain": "ssl.domain.example",
+  "url": "https://ssl.domain.example",
+  "certificate": {
+    "subject": "/O=Example, Inc./OU=Example Origin CA/CN=Example Origin Certificate",
+    "expired": false,
+    "certificate": "-----BEGIN CERTIFICATE-----\n … \n-----END CERTIFICATE-----",
+    "certificate_text": "Certificate:\n … \n"
+  }
+}
+```
+
+## Delete pages domain
+
+Deletes an existing project pages domain.
+
+```http
+DELETE /projects/:id/pages/domains/:domain
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `id`      | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `domain`  | string         | yes      | The domain                               |
+
+```bash
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/5/pages/domains/ssl.domain.example
+```