Web services

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How it works

This simple example will give you an idea of how our web services infrastructure works.

  1. The client sends a username and password to the web service login script.
  2. The script returns a token for that user account.
  3. The client calls a particular web service function on a protocol server including the token .
  4. The protocol server uses the token to check that the user can call the function.
  5. The protocol server calls the matching external function, located in a externallib.php file inside the relevant module.
  6. The external function checks that the current user has_capability to do this operation.
  7. The external function calls the matching Moodle core function (in lib.php usually).
  8. The core function can return a result to the external function.
  9. The external function will return a result to the protocol server.
  10. The protocol server returns the result to the client.

Developer documentation

The full API can be found on any Moodle sites under Administration block > Plugins > Web services > API Documentation.

Note: Additional services are available for uploading and downloading files which are not in the API Documentation - they are accessed in a different way. See Web services files handling

Specification and brainstorming

See also