CVS log for loncom/lti/ltiroster.pm

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- Bug 6754
  Documentation says to use Encode::decode('UTF-8',$string) instead of
  Encode::decode_utf8($string) for data exchange.

- First arg for ltiutils::verify_request() changed in ltiutils rev. 1.15.

- Bug 6754 LON-CAPA as LTI Provider
  - Support requests to /adm/service/passback and /adm/service/roster in
    which OAuth data in request header.
  - Support LTI Basic Outcomes Service (1.1) in which grade (a decimal) is
    included in XML in the request body (with oauth_body_hash in the header).
  - LTI Provider domain configuration to set grade passback using either
    Outcomes Service (1.1) -- the default -- or Outcomes extension (1.0).

- Use correct hash to retrieve current gradesecret when generating
  unique lis_result_sourcedid for each student to send in roster.

- Sequential numbering of errors when requesting service from LTI Consumer
  to store grades or retrieve roster.

Bug 6754 LTI Integration
- ltiutils.pm contains common LTI routines (to facilitate re-use).
  - &check_nonce() moved from ltiauth.pm to ltiutils.pm.
  - &set_callback_secret() moved from lonexttool.pm to ltiutils.pm, and
    renamed &set_service_secret().
  - &sign_params(), &get_tool_lock(), and &release_tool_lock() moved from
    lonexttool.pm to ltiutils.pm
- ltiroster.pm will service requests for course membership information
  from an LTI Provider, where domain configuration for Tool permits this
  service, and launch (by Instructor( included ext_ims_lis_memberships_id.