API documentation extended with snippets, tags and commits

Documentation is updated with information how to handle snippets or how to access tags
and commits. Nearly all project specific functions are now described in the documentation.
A few previous entries have been updated with status codes, e.g. `401 Unauthorized`.

doc/api/projects.md

@@ -197,8 +197,9 @@ Parameters:
 
 Return Values:
 
-+ `200 Ok` on success and the added user, even if the user is already team member
++ `201 Created` on success and the added user is returned, even if the user is already team member
 + `400 Bad Request` if the required attribute access_level is not given
++ `401 Unauthorized` if the user is not allowed to add a new team member
 + `404 Not Found` if a resource can not be found, e.g. project with ID not available
 + `422 Unprocessable Entity` if an unknown access_level is given
 
@@ -221,6 +222,7 @@ Return Values:
 
 + `200 Ok` on succes and the modified team member
 + `400 Bad Request` if the required attribute access_level is not given
++ `401 Unauthorized` if the user is not allowed to modify a team member
 + `404 Not Found` if a resource can not be found, e.g. project with ID not available
 + `422 Unprocessable Entity` if an unknown access_level is given
 
@@ -241,6 +243,7 @@ Parameters:
 Return Values:
 
 + `200 Ok` on success
++ `401 Unauthorized` if user is not allowed to remove a team member
 + `404 Not Found` if either project or user can not be found
 
 This method is idempotent and can be called multiple times with the same parameters.
@@ -266,6 +269,7 @@ Parameters:
 Return values:
 
 + `200 Ok` on success with a list of hooks
++ `401 Unauthorized` if user is not allowed to get list of hooks
 + `404 Not Found` if project can not be found
 
 
@@ -437,3 +441,151 @@ Return values:
 
 + `200 Ok` on success
 + `404 Not Found` if either project or branch could not be found
+
+
+### List tags
+
+Lists all tags of a project.
+
+```
+GET /projects/:id/repository/tags
+```
+
+Parameters:
+
++ `id` (required) - The ID of the project
+
+Return values:
+
++ `200 Ok` on success and a list of tags
++ `404 Not Found` if project with id not found
+
+
+### List commits
+
+Lists all commits with pagination. If the optional `ref_name` name is not given the commits of
+the default branch (usually master) are returned.
+
+```
+GET /projects/:id/repository/commits
+```
+
+Parameters:
+
++ `id` (required) - The Id of the project
++ `ref_name` (optional) - The name of a repository branch or tag
++ `page` (optional) - The page of commits to return (`0` default)
++ `per_page` (optional) - The number of commits per page (`20` default)
+
+Returns values:
+
++ `200 Ok` on success and a list with commits
++ `404 Not Found` if project with id or the branch with `ref_name` not found
+
+
+## Snippets
+
+### List snippets
+
+Lists the snippets of a project.
+
+```
+GET /projects/:id/snippets
+```
+
+Parameters:
+
++ `id` (required) - The ID of the project
+
+Return values:
+
++ `200 Ok` on success and the list of snippets
++ `404 Not Found` if project with id not found
+
+
+### List single snippet
+
+Lists a single snippet of a project
+
+```
+GET /projects/:id/snippets/:snippet_id
+```
+
+Parameters:
+
++ `id` (required) - The ID of the project
++ `snippet_id` (required) - The ID of the snippet
+
+Return values:
+
++ `200 Ok` on success and the project snippet
++ `404 Not Found` if project ID or snippet ID not found
+
+
+### Create snippet
+
+Creates a new project snippet.
+
+```
+POST /projects/:id/snippets
+```
+
+Parameters:
+
++ `id` (required) - The ID of the project
++ `title` (required) - The title of the new snippet
++ `file_name` (required) - The file name of the snippet
++ `code` (required) - The content of the snippet
++ `lifetime` (optional) - The expiration date of a snippet
+
+Return values:
+
++ `201 Created` on success and the new snippet
++ `400 Bad Request` if one of the required attributes is missing
++ `401 Unauthorized` if it is not allowed to post a new snippet
++ `404 Not Found` if the project ID is not found
+
+
+### Update snippet
+
+Updates an existing project snippet.
+
+```
+PUT /projects/:id/snippets/:snippet_id
+```
+
+Parameters:
+
++ `id` (required) - The ID of the project
++ `snippet_id` (required) - The id of the project snippet
++ `title` (optional) - The new title of the project snippet
++ `file_name` (optional) - The new file name of the project snippet
++ `lifetime` (optional) - The new expiration date of the snippet
++ `code` (optional) - The content of the snippet
+
+Return values:
+
++ `200 Ok` on success and the content of the updated snippet
++ `401 Unauthorized` if the user is not allowed to modify the snippet
++ `404 Not Found` if project ID or snippet ID is not found
+
+
+## Delete snippet
+
+Deletes a project snippet. This is an idempotent function call and returns `200 Ok`
+even if the snippet with the id is not available.
+
+```
+DELETE /projects/:id/snippets/:snippet_id
+```
+
+Paramaters:
+
++ `id` (required) - The ID of the project
++ `snippet_id` (required) - The ID of the snippet
+
+Return values:
+
++ `200 Ok` on success, if the snippet got deleted it is returned, if not available then an empty JSON response
++ `401 Unauthorized` if the user is not allowed to remove the snippet
++ `404 Not Found` if the project ID not found