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| {{Template:Work in progress}}{{Moodle_2.0}} | | {{Template:Migrated|newDocId=/docs/apis/subsystems/external/}} |
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| =Introduction= | |
| This page described the Web Services module implemented for Moodle 2.0<br>
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| The tracker issue is here: MDL-12886<br>
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| This module is been implemented by the [http://blogs.dfwikilabs.org/moodle_ws/ DFWS Team] and Moodle.
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| =Implementation=
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| Web Services module has been conceived in a purpose to be ported on different Moodle version, and also on different project. It has also for purpose to support multiple web service protocols (REST, SOAP, XML-RPC and AMF). Adding a new protocol support should be relatively easy.
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| == How it works ==
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| #The client sends a username and password to the web service protocol server script.
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| #The protocol server returns a session token for that user account (how this is sent depends on the protocol).
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| #The client calls a particular web service function (module name, function name, and function parameters), including the session token.
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| #The protocol server uses the token to check that the session is still active.
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| #The protocol server call the matching external function, located in a external.php file inside the relevant module.
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| #The external function checks that the current user has_capability to do this operation.
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| #The external function calls the matching Moodle core function (in lib.php usually).
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| #The core function can return a result to the external function.
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| #The external function will return a result to the protocol server.
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| #The protocol server returns the result to the client.
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| [[Image:Web_service_graph.jpg]]
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| ==phpDoc format==
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| All callable functions are declared into each external.php. Web service descriptions are defined into their respective phpDoc.
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| ==web services technical documentation==
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| In order to facilitate a Moodle web service client implementation, we provide a page listing all function descriptions. We also give some useful advice for any supported protocol.
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| =Authentication=
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| Clients needing to use a web service will need a Moodle user account with the ''''moodle/site:usewebservices'''' capability enabled. After the first login with username and password the session is retained with a token that gets passed with every web service request (until the session expires).
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| The Moodle administrator can control access to the site using the ''''Security -> Web services'''' page, which contains settings for:
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| * enabling/disabling particular protocols (SOAP, REST, AMF, XMLRPC, ...)
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| * configure protocol-specific settings (though we can't think of any such settings)
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| * configure system-wide default settings (stored in config table):
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| # IP whitelist
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| # Anything else?
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| * configure per-user settings (stored in user_preferences):
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| # IP whitelist
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| # Anything else?
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| Each protocol will call a webservice authentication function before allowing access, which will:
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| # Check that particular protocol is enabled for the system
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| # Authenticate the user using username/password and normal auth plugins (internal, LDAP etc)
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| # Check that the user has ''''moodle/site:usewebservices'''' at SYSTEM level.
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| # Check the per-user restrictions, if there are any, else check the system settings
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| # Create a session and return a token for the web service protocol to use.
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| This is probably enough (an auth/webservice is not necessary).
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| [[Image:Webserviceadmin.png]]
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