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LTI Variable Substitutions
==========================

Variable substitution (aka variable expansion) is where custom variables really start to
shine.  They provide a mechanism for tool providers to request that specific, contextual
information be sent across in the launch.  When the tool consumer processes the launch request,
it detects requested variable substitutions and sends the appropriate data where possible.
Adding variable substitutions is exactly the same as adding custom variables, except the values
are variables instead of constants.  This is denoted by prefixing the value with a $.  If the
tool consumer doesn't recognize, or can't substitute, the value it will just send the variable
as if it were are regular custom variable (i.e. the name of the substitution variable will be
sent rather than the value).

This allows Canvas to expose data as LTI launch parameters during the LTI launch rather than
requiring access to the Canvas API, which can be expensive for Canvas and the tool.  It allows
tool providers to be much more surgical when requesting user data, and it paves the way for us
to be more transparent to tool installers, by showing them exactly what data the LTI tool will
be given access to. Additionally, variable substitutions are generally simple to add to Canvas
relative to gaining API access.

There are currently over 80 substitutions available.  Many of the substitutions simply
give access to additional user and context information.  An LTI tool can request things
like SIS ids, names, an avatar image, and an email address.  Other variable substitutions
assist tools with accessibility (prefersHighContrast), course copy (previousCourseIds), and
masquerading users.  Additionally, when we don't provide enough information or customization
directly through LTI, tools can request everything they need to use the Canvas API for an even
richer experience.

Some substitutions may be used as 'enabled_capabilities' for LTI2 tools. These substitutions have a
'Launch Parameter' label indicating the parameter name that will be sent in the tool launch if enabled.

For more information on variable substitution, see the <a href="https://www.imsglobal.org/specs/ltiv1p1p1/implementation-guide#toc-9">IMS LTI specification</a>.

# Usage/Configuration
Variable substitutions can be configured for a tool in 3 ways:

## Via UI
Custom fields can be <a href="https://community.canvaslms.com/docs/DOC-3033">configured via UI</a> by editing the tool configuration and adding the
desired variable to the Custom Fields text box.

The following would add the domain as a launch parameter called custom_arbitrary_name:

```
arbitrary_name=$Canvas.api.domain
```

## Via API
Custom fields can also be <a href="/doc/api/external_tools.html#method.external_tools.create">configured via API</a>.

This would install a course-level tool with domain as a custom field:
```
curl 'https://<domain>.instructure.com/api/v1/courses/<course_id>/external_tools' \
  -X POST \
  -H "Authorization: Bearer <token>;" \
  -F 'name=LTI Example' \
  -F 'consumer_key=some_key' \
  -F 'shared_secret=some_secret' \
  -F 'url=https://example.com/ims/lti' \
  -F 'privacy_level=name_only' \
  -F 'custom_fields[domain]=$Canvas.api.domain'
```

## Via JSON Configuration (LTI 1.3)
JSON can be used to <a href="https://community.canvaslms.com/docs/DOC-16729-42141110178" target="_blank">configure an LTI 1.3 Developer Key</a>.

The following JSON would create a developer key with the a placement specfic custom field and a tool-level custom field:

```
{  
   "title":"Variable Expansion Tool",
   "scopes":[  

   ],
   "extensions":[  
      {  
         "domain":"variableexpander.com",
         "tool_id":"variable-expansion-example",
         "platform":"canvas.instructure.com",
         "settings":{  
            "text":"Variation Expansion Tool Text",
            "icon_url":"https://some.icon.url",
            "placements":[  
               {  
                  "text":"User Navigation Placement",
                  "enabled":true,
                  "icon_url":"https://static.thenounproject.com/png/131630-200.png",
                  "placement":"user_navigation",
                  "message_type":"LtiResourceLinkRequest",
                  "target_link_uri":"https://lti-ri.imsglobal.org/lti/tools/281/launches",
                  "canvas_icon_class":"icon-lti",
                  "custom_fields":{  
                     "foo":"$Canvas.user.id"
                  }
               }
            ]
         }
      }
   ],
   "public_jwk":{  
      "kty":"RSA",
      "alg":"RS256",
      "e":"AQAB",
      "kid":"8f796169-0ac4-48a3-a202-fa4f3d814fcd",
      "n":"nZD7QWmIwj-3N_RZ1qJjX6CdibU87y2l02yMay4KunambalP9g0fU9yZLwLX9WYJINcXZDUf6QeZ-SSbblET-h8Q4OvfSQ7iuu0WqcvBGy8M0qoZ7I-NiChw8dyybMJHgpiP_AyxpCQnp3bQ6829kb3fopbb4cAkOilwVRBYPhRLboXma0cwcllJHPLvMp1oGa7Ad8osmmJhXhM9qdFFASg_OCQdPnYVzp8gOFeOGwlXfSFEgt5vgeU25E-ycUOREcnP7BnMUk7wpwYqlE537LWGOV5z_1Dqcqc9LmN-z4HmNV7b23QZW4_mzKIOY4IqjmnUGgLU9ycFj5YGDCts7Q",
      "use":"sig"
   },
   "description":"1.3 Test Tool",
   "custom_fields":{  
      "bar":"$Canvas.user.sisid"
   },
   "target_link_uri":"https://your.target_link_uri",
   "oidc_initiation_url":"https://your.oidc_initiation_url"
}
```

## Via XML Configuration (LTI 1.1)
Custom fields can also be <a href="/doc/api/file.tools_xml.html">configured via XML</a>.

This would create a tool in a course with custom fields, some of which are specific for a
particular placement:
```
<?xml version="1.0" encoding="UTF-8"?>
   <cartridge_basiclti_link xmlns="http://www.imsglobal.org/xsd/imslticc_v1p0"
       xmlns:blti = "http://www.imsglobal.org/xsd/imsbasiclti_v1p0"
       xmlns:lticm ="http://www.imsglobal.org/xsd/imslticm_v1p0"
       xmlns:lticp ="http://www.imsglobal.org/xsd/imslticp_v1p0"
       xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation = "http://www.imsglobal.org/xsd/imslticc_v1p0 http://www.imsglobal.org/xsd/lti/ltiv1p0/imslticc_v1p0.xsd
       http://www.imsglobal.org/xsd/imsbasiclti_v1p0 http://www.imsglobal.org/xsd/lti/ltiv1p0/imsbasiclti_v1p0.xsd
       http://www.imsglobal.org/xsd/imslticm_v1p0 http://www.imsglobal.org/xsd/lti/ltiv1p0/imslticm_v1p0.xsd
       http://www.imsglobal.org/xsd/imslticp_v1p0 http://www.imsglobal.org/xsd/lti/ltiv1p0/imslticp_v1p0.xsd">
     <blti:title>Wikipedia</blti:title>
     <blti:launch_url>https://www.wikipedia.org/</blti:launch_url>
     <blti:custom>
       <lticm:property name="user_sis_id">$Person.sourcedId</lticm:property>
     </blti:custom>
     <blti:extensions platform="canvas.instructure.com">
       <lticm:property name="domain">wikipedia.org</lticm:property>
       <lticm:options name="custom_fields">
           <lticm:property name="canvas_api_domain">$Canvas.api.domain</lticm:property>
           <lticm:property name="canvas_user_id">$Canvas.user.id</lticm:property>
       </lticm:options>
       <lticm:options name="course_navigation">
         <lticm:property name="url">https://en.wikipedia.org/wiki/Wikipedia:Unusual_articles#mediaviewer/File:Cow-on_pole,_with_antlers.jpeg</lticm:property>
         <lticm:property name="text">Cow With Antlers</lticm:property>
         <lticm:options name="custom_fields">
           <lticm:property name="concluded_roles">$Canvas.membership.concludedRoles</lticm:property>
         </lticm:options>
       </lticm:options>
     </blti:extensions>
   </cartridge_basiclti_link>
```
# Supported Substitutions
## Context.title
The title of the context.

**Availability**: *always*  
**Launch Parameter**: *context_title*  

```
"Example Course"
```
## com.instructure.Editor.contents
The contents of the text editor associated with the content item launch.

**Availability**: *always*  
**Launch Parameter**: *com_instructure_editor_contents*  

```
"This text was in the editor"
```
## com.instructure.Editor.selection
The contents the user has selected in the text editor associated
with the content item launch.

**Availability**: *always*  
**Launch Parameter**: *com_instructure_editor_selection*  

```
"this text was selected by the user"
```
## com.instructure.PostMessageToken
A token that can be used for frontend communication between an LTI tool
and Canvas via the Window.postMessage API.

**Availability**: **  
**Launch Parameter**: *com_instructure_post_message_token*  

```
"9ae4170c-6b64-444d-9246-0b7dedd5f560"
```
## com.instructure.Assignment.lti.id
The LTI assignment id of an assignment. This value corresponds with
the `ext_lti_assignment_id` send in various launches and webhooks.

**Availability**: *always*  
**Launch Parameter**: *com_instructure_assignment_lti_id*  

```
"9ae4170c-6b64-444d-9246-0b7dedd5f560"
```
## com.instructure.OriginalityReport.id
The Canvas id of the Originality Report associated
with the launch.

**Availability**: **  
**Launch Parameter**: *com_instructure_originality_report_id*  

```
23
```
## com.instructure.Submission.id
The Canvas id of the submission associated with the
launch.

**Availability**: **  
**Launch Parameter**: *com_instructure_submission_id*  

```
23
```
## com.instructure.File.id
The Canvas id of the file associated with the submission
in the launch.

**Availability**: **  
**Launch Parameter**: *com_instructure_file_id*  

```
23
```
## CourseOffering.sourcedId
the LIS identifier for the course offering.

**Availability**: *when launched in a course*  
**Launch Parameter**: *lis_course_offering_sourcedid*  

```
1234
```
## Context.id
an opaque identifier that uniquely identifies the context of the tool launch.

**Availability**: *always*  
**Launch Parameter**: *context_id*  

```
"cdca1fe2c392a208bd8a657f8865ddb9ca359534"
```
## Context.sourcedId
The sourced Id of the context.

**Availability**: *always*  


```
1234
```
## Message.documentTarget
communicates the kind of browser window/frame where the Canvas has launched a tool.

**Availability**: *always*  
**Launch Parameter**: *launch_presentation_document_target*  

```
"iframe"
```
## Message.locale
returns the current locale.

**Availability**: *always*  
**Launch Parameter**: *launch_presentation_locale*  

```
"de"
```
## ToolConsumerInstance.guid
returns a unique identifier for the Tool Consumer (Canvas).

**Availability**: *always*  
**Launch Parameter**: *tool_consumer_instance_guid*  

```
"0dWtgJjjFWRNT41WdQMvrleejGgv7AynCVm3lmZ2:canvas-lms"
```
## Canvas.api.domain
returns the canvas domain for the current context.

**Availability**: *always*  


```
"canvas.instructure.com"
```
## Canvas.api.collaborationMembers.url
returns the api url for the members of the collaboration.

**Availability**: *always*  


```
"https://canvas.instructure.com/api/v1/collaborations/1/members"
```
## Canvas.api.baseUrl
returns the base URL for the current context.

**Availability**: *always*  


```
"https://canvas.instructure.com"
```
## ToolProxyBinding.memberships.url
returns the URL for the membership service associated with the current context.

This variable is for future use only. Complete support for the IMS Membership Service has not been added to Canvas. This will be updated when we fully support and certify the IMS Membership Service.

**Availability**: *always*  


```
"https://canvas.instructure.com/api/lti/courses/1/membership_service"
```
## Canvas.account.id
returns the account id for the current context.

**Availability**: *always*  


```
1234
```
## Canvas.account.name
returns the account name for the current context.

**Availability**: *always*  


```
"School Name"
```
## Canvas.account.sisSourceId
returns the account's sis source id for the current context.

**Availability**: *always*  


```
"sis_account_id_1234"
```
## Canvas.rootAccount.id
returns the Root Account ID for the current context.

**Availability**: *always*  


```
1234
```
## Canvas.rootAccount.sisSourceId
returns the root account's sis source id for the current context.

**Availability**: *always*  


```
"sis_account_id_1234"
```
## Canvas.externalTool.url
returns the URL for the external tool that was launched. Only available for LTI 1.

**Availability**: *always and when in an LTI 1*  


```
"http://example.url/path"
```
## com.instructure.brandConfigJSON.url
returns the URL to retrieve the brand config JSON for the launching context.

**Availability**: *always*  


```
"http://example.url/path.json"
```
## com.instructure.brandConfigJSON
returns the brand config JSON itself for the launching context.

**Availability**: *always*  


```
{"ic-brand-primary-darkened-5":"#0087D7"}
```
## com.instructure.brandConfigJS.url
returns the URL to retrieve the brand config javascript for the launching context.
This URL should be used as the src attribute for a script tag on the external tool
provider's web page. It is configured to be used with the [instructure-ui node module](https://github.com/instructure/instructure-ui).
More information on on how to use instructure ui react components can be found [here](http://instructure.github.io/instructure-ui/).

**Availability**: *always*  


```
"http://example.url/path.js"
```
## Canvas.css.common
returns the URL for the common css file.

**Availability**: *always*  


```
"http://example.url/path.css"
```
## Canvas.shard.id
returns the shard id for the current context.

**Availability**: *always*  


```
1234
```
## Canvas.root_account.global_id [duplicates Canvas.user.globalId]
returns the root account's global id for the current context.

**Availability**: *always*  


```
123400000000123
```
## Canvas.root_account.id *[deprecated]*
returns the root account id for the current context.

**Availability**: *always*  


```
1234
```
## vnd.Canvas.root_account.uuid
returns the account uuid for the current context.

**Availability**: *always*  
**Launch Parameter**: *vnd_canvas_root_account_uuid*  

```
"Ioe3sJPt0KZp9Pw6xAvcHuLCl0z4TvPKP0iIOLbo"
```
## Canvas.root_account.sisSourceId *[deprecated]*
returns the root account sis source id for the current context.

**Availability**: *always*  


```
1234
```
## Canvas.course.id
returns the current course id.

**Availability**: *when launched in a course*  


```
1234
```
## vnd.instructure.Course.uuid
returns the current course uuid.

**Availability**: *when launched in a course*  


```
"S3vhRY2pBzG8iPdZ3OBPsPrEnqn5sdRoJOLXGbwc"
```
## Canvas.course.name
returns the current course name.

**Availability**: *when launched in a course*  


```
"Course Name"
```
## Canvas.course.sisSourceId
returns the current course sis source id.

**Availability**: *when launched in a course*  


```
1234
```
## Canvas.course.startAt
returns the current course start date.

**Availability**: *when launched in a course*  


```
2018-01-15 00:00:00 -0700
```
## Canvas.course.endAt
returns the current course end date.

**Availability**: *when launched in a course*  


```
2018-05-01 00:00:00 -0700
```
## Canvas.course.workflowState
returns the current course workflow state. Workflow states of "claimed" or "created"
indicate an unpublished course.

**Availability**: *when launched in a course*  


```
"active"
```
## Canvas.term.startAt
returns the current course's term start date.

**Availability**: *when launched in a course that has a term with a start date*  


```
2018-01-12 00:00:00 -0700
```
## Canvas.term.name
returns the current course's term name.

**Availability**: **  
**Launch Parameter**: *canvas_term_name*  

```
"W1 2017"
```
## CourseSection.sourcedId
returns the current course sis source id
to return the section source id use Canvas.course.sectionIds.

**Availability**: *when launched in a course*  
**Launch Parameter**: *lis_course_section_sourcedid*  

```
1234
```
## Canvas.enrollment.enrollmentState
returns the current course enrollment state.

**Availability**: *when launched in a course*  


```
"active"
```
## com.instructure.Assignment.anonymous_grading
returns true if the assignment has anonymous grading
enabled.

**Availability**: *when launched as an assignment*  
**Launch Parameter**: *com_instructure_assignment_anonymous_grading*  

```
true
```
## com.Instructure.membership.roles
returns the current course membership roles
using the LIS v2 vocabulary.

**Availability**: *when launched from a course or an account*  
**Launch Parameter**: *com_instructure_membership_roles*  

```
"http://purl.imsglobal.org/vocab/lis/v2/institution/person#Student"
```
## Canvas.membership.roles
returns the current course membership roles.

**Availability**: *when launched from a course or an account*  
**Launch Parameter**: *canvas_membership_roles*  

```
"StudentEnrollment"
```
## Canvas.membership.concludedRoles
This is a list of IMS LIS roles should have a different key.

**Availability**: *when launched in a course*  


```
"urn:lti:sysrole:ims/lis/None"
```
## Canvas.course.previousContextIds
With respect to the current course, returns the context ids of the courses from which content has been copied (excludes cartridge imports).

**Availability**: *when launched in a course*  


```
"1234,4567"
```
## Canvas.course.previousContextIds.recursive
With respect to the current course, recursively returns the context ids of the courses from which content has been copied (excludes cartridge imports).

**Availability**: *when launched in a course*  


```
"1234,4567"
```
## Canvas.course.previousCourseIds
With respect to the current course, returns the course ids of the courses from which content has been copied (excludes cartridge imports).

**Availability**: *when launched in a course*  


```
1234
```
## Person.name.full
Returns the full name of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *lis_person_name_full*  

```
"John Doe"
```
## Person.name.display
Returns the display name of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *person_name_display*  

```
"John Doe"
```
## Person.name.family
Returns the last name of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *lis_person_name_family*  

```
"Doe"
```
## Person.name.given
Returns the first name of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *lis_person_name_given*  

```
"John"
```
## com.instructure.Person.name_sortable
Returns the sortable name of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *com_instructure_person_name_sortable*  

```
"Doe, John"
```
## Person.email.primary
Returns the primary email of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *lis_person_contact_email_primary*  

```
"john.doe@example.com"
```
## com.instructure.Person.pronouns
Returns pronouns for the current user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *com_instructure_person_pronouns*  

```
"She/Her"
```
## vnd.Canvas.Person.email.sis
Returns the institution assigned email of the launching user.

**Availability**: *when launched by a logged in user that was added via SIS*  


```
"john.doe@example.com"
```
## Person.address.timezone
Returns the name of the timezone of the launching user.

**Availability**: *when launched by a logged in user*  


```
"America/Denver"
```
## User.image
Returns the profile picture URL of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *user_image*  

```
"https://example.com/picture.jpg"
```
## User.id [duplicates Canvas.user.id]
Returns the Canvas user_id of the launching user.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *user_id*  

```
420000000000042
```
## Canvas.user.id [duplicates User.id]
Returns the Canvas user_id of the launching user.

**Availability**: *when launched by a logged in user*  


```
420000000000042
```
## vnd.instructure.User.uuid [duplicates User.uuid]
Returns the Canvas user_uuid of the launching user for the context.

**Availability**: *when launched by a logged in user*  


```
"N2ST123dQ9zyhurykTkBfXFa3Vn1RVyaw9Os6vu3"
```
## vnd.instructure.User.current_uuid [duplicates User.uuid]
Returns the current Canvas user_uuid of the launching user.

**Availability**: *when launched by a logged in user*  


```
"N2ST123dQ9zyhurykTkBfXFa3Vn1RVyaw9Os6vu3"
```
## Canvas.user.prefersHighContrast
Returns the users preference for high contrast colors (an accessibility feature).

**Availability**: *when launched by a logged in user*  


```
false
```
## com.instructure.Course.groupIds
returns the Canvas ids of all active groups in the current course.

**Availability**: *when launched in a course*  
**Launch Parameter**: *com_instructure_course_groupids*  

```
"23,24,..."
```
## Canvas.group.contextIds
returns the context ids for the groups the user belongs to in the course.

**Availability**: *always*  


```
"1c16f0de65a080803785ecb3097da99872616f0d,d4d8d6ae1611e2c7581ce1b2f5c58019d928b79d,..."
```
## Membership.role
Returns the [IMS LTI membership service](https://www.imsglobal.org/specs/ltimemv1p0/specification-3) roles for filtering via query parameters.
Or, for LTI 1.3 tools, returns the [IMS LTI Names and Role Provisioning Service](https://www.imsglobal.org/spec/lti-nrps/v2p0) roles for filtering via query parameters.

**Availability**: *when launched by a logged in user*  
**Launch Parameter**: *roles*  

```
"http://purl.imsglobal.org/vocab/lis/v2/institution/person#Administrator"
```
## Canvas.xuser.allRoles [duplicates ext_roles which is sent by default]
Returns list of [LIS role full URNs](https://www.imsglobal.org/specs/ltiv1p0/implementation-guide#toc-16).
Note that this will include all roles the user has.
There are 3 different levels of roles defined: Context, Institution, System.
Context role urns start with "urn:lti:ims" and include roles for the context where the launch occurred.
Institution role urns start with "urn:lti:instrole" and include roles the user has in the institution. This
will include roles they have in other courses or at the account level. Note that there is not a TA role at the
Institution level. Instead Users with a TA enrollment will have an institution role of Instructor.
System role urns start with "urn:lti:sysrole" and include roles for the entire system.

**Availability**: *always*  


```
"urn:lti:instrole:ims/lis/Administrator,urn:lti:instrole:ims/lis/Instructor,urn:lti:sysrole:ims/lis/SysAdmin,urn:lti:sysrole:ims/lis/User"
```
## com.instructure.User.allRoles
Same as "Canvas.xuser.allRoles", but uses roles formatted for LTI Advantage.

**Availability**: *always*  


```
 "http://purl.imsglobal.org/vocab/lis/v2/institution/person#Student",
 "http://purl.imsglobal.org/vocab/lis/v2/membership#Instructor",
 "http://purl.imsglobal.org/vocab/lis/v2/system/person#User"
```
## Canvas.user.globalId [duplicates Canvas.root_account.global_id]
Returns the Canvas global user_id of the launching user.

**Availability**: *when launched by a logged in user*  


```
420000000000042
```
## Canvas.user.isRootAccountAdmin
Returns true for root account admins and false for all other roles.

**Availability**: *when launched by a logged in user*  


```
true
```
## User.username [duplicates Canvas.user.loginId]
Username/Login ID for the primary pseudonym for the user for the account.
This may not be the pseudonym the user is actually logged in with.

**Availability**: *when pseudonym is in use*  


```
"jdoe"
```
## Canvas.user.loginId [duplicates User.username]
Username/Login ID for the primary pseudonym for the user for the account.
This may not be the pseudonym the user is actually logged in with.

**Availability**: *when pseudonym is in use*  


```
"jdoe"
```
## Canvas.user.sisSourceId [duplicates Person.sourcedId]
Returns the sis source id for the primary pseudonym for the user for the account
This may not be the pseudonym the user is actually logged in with.

**Availability**: *when pseudonym is in use*  


```
"sis_user_42"
```
## Canvas.user.sisIntegrationId
Returns the integration id for the primary pseudonym for the user for the account
This may not be the pseudonym the user is actually logged in with.

**Availability**: *when pseudonym is in use*  


```
"integration_user_42"
```
## Person.sourcedId [duplicates Canvas.user.sisSourceId]
Returns the sis source id for the primary pseudonym for the user for the account
This may not be the pseudonym the user is actually logged in with.

**Availability**: *when pseudonym is in use*  
**Launch Parameter**: *lis_person_sourcedid*  

```
"sis_user_42"
```
## Canvas.logoutService.url
Returns the logout service url for the user.
This is the pseudonym the user is actually logged in as.
It may not hold all the sis info needed in other launch substitutions.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/v1/logout_service/<external_tool_id>-<user_id>-<current_unix_timestamp>-<opaque_string>"
```
## Canvas.masqueradingUser.id
Returns the Canvas user_id for the masquerading user.
This is the pseudonym the user is actually logged in as.
It may not hold all the sis info needed in other launch substitutions.

**Availability**: *when the user is being masqueraded*  


```
420000000000042
```
## Canvas.masqueradingUser.userId
Returns the 40 character opaque user_id for masquerading user.
This is the pseudonym the user is actually logged in as.
It may not hold all the sis info needed in other launch substitutions.

**Availability**: *when the user is being masqueraded*  


```
"da12345678cb37ba1e522fc7c5ef086b7704eff9"
```
## Canvas.xapi.url
Returns the xapi url for the user.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/v1/xapi/<external_tool_id>-<user_id>-<course_id>-<current_unix_timestamp>-<opaque_id>"
```
## Caliper.url
Returns the caliper url for the user.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/v1/caliper/<external_tool_id>-<user_id>-<course_id>-<current_unix_timestamp>-<opaque_id>"
```
## Canvas.course.sectionIds
Returns a comma separated list of section_id's that the user is enrolled in.

**Availability**: *when launched from a course*  


```
"42, 43"
```
## Canvas.course.sectionRestricted
Returns true if the user can only view and interact with users in their own sections.

**Availability**: *when launched from a course*  


```
true
```
## Canvas.course.sectionSisSourceIds
Returns a comma separated list of section sis_id's that the user is enrolled in.

**Availability**: *when launched from a course*  


```
"section_sis_id_1, section_sis_id_2"
```
## com.instructure.contextLabel
Returns the course code.

**Availability**: *when launched in a course*  
**Launch Parameter**: *context_label*  

```
"CS 124"
```
## Canvas.module.id
Returns the module_id that the module item was launched from.

**Availability**: *when content tag is present*  


```
1234
```
## Canvas.moduleItem.id
Returns the module_item_id of the module item that was launched.

**Availability**: *when content tag is present*  


```
1234
```
## Canvas.assignment.id
Returns the assignment_id of the assignment that was launched.

**Availability**: *when launched as an assignment*  


```
1234
```
## com.instructure.Group.id
Returns the Canvas id of the group the current user is in if launching
from a group assignment.

**Availability**: *when launched by a logged in user and when launched as an assignment*  
**Launch Parameter**: *vnd_canvas_group_id*  

```
481
```
## com.instructure.Group.name
Returns the name of the group the current user is in if launching
from a group assignment.

**Availability**: *when launched by a logged in user and when launched as an assignment*  
**Launch Parameter**: *vnd_canvas_group_name*  

```
"Group One"
```
## Canvas.assignment.title
Returns the title of the assignment that was launched.

**Availability**: *when launched as an assignment*  


```
"Deep thought experiment"
```
## Canvas.assignment.pointsPossible
Returns the points possible of the assignment that was launched.

**Availability**: *when launched as an assignment*  


```
100
```
## Canvas.assignment.unlockAt *[deprecated]*
deprecated in favor of ISO8601.

**Availability**: *when launched as an assignment*  



## Canvas.assignment.lockAt *[deprecated]*
deprecated in favor of ISO8601.

**Availability**: *when launched as an assignment*  



## Canvas.assignment.dueAt *[deprecated]*
deprecated in favor of ISO8601.

**Availability**: *when launched as an assignment*  



## Canvas.assignment.unlockAt.iso8601
Returns the `unlock_at` date of the assignment that was launched.
Only available when launched as an assignment with an `unlock_at` set.

**Availability**: *always*  


```
2018-02-18T00:00:00Z
```
## Canvas.assignment.lockAt.iso8601
Returns the `lock_at` date of the assignment that was launched.
Only available when launched as an assignment with a `lock_at` set.

**Availability**: *always*  


```
2018-02-20:00:00Z
```
## Canvas.assignment.dueAt.iso8601
Returns the `due_at` date of the assignment that was launched.
Only available when launched as an assignment with a `due_at` set.

**Availability**: *always*  


```
2018-02-19:00:00Z
```
## Canvas.assignment.published
Returns true if the assignment that was launched is published.
Only available when launched as an assignment.

**Availability**: *when launched as an assignment*  


```
true
```
## LtiLink.custom.url
Returns the endpoint url for accessing link-level tool settings
Only available for LTI 2.0.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/tool_settings/<link_id>"
```
## ToolProxyBinding.custom.url
Returns the endpoint url for accessing context-level tool settings
Only available for LTI 2.0.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/tool_settings/<binding_id>"
```
## ToolProxy.custom.url
Returns the endpoint url for accessing system-wide tool settings
Only available for LTI 2.0.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/tool_settings/<proxy_id>"
```
## ToolConsumerProfile.url
Returns the [Tool Consumer Profile](https://www.imsglobal.org/specs/ltiv2p0/implementation-guide#toc-46) url for the tool.
Only available for LTI 2.0.

**Availability**: *always*  


```
"https://<domain>.instructure.com/api/lti/courses/<course_id>/tool_consumer_profile/<opaque_id>"
"https://<domain>.instructure.com/api/lti/accounts/<account_id>/tool_consumer_profile/<opaque_id>"
```
## vnd.Canvas.OriginalityReport.url
The originality report LTI2 service endpoint.

**Availability**: *always*  
**Launch Parameter**: *vnd_canvas_originality_report_url*  

```
"api/lti/assignments/{assignment_id}/submissions/{submission_id}/originality_report"
```
## vnd.Canvas.submission.url
The submission LTI2 service endpoint.

**Availability**: *always*  
**Launch Parameter**: *vnd_canvas_submission_url*  

```
"api/lti/assignments/{assignment_id}/submissions/{submission_id}"
```
## vnd.Canvas.submission.history.url
The submission history LTI2 service endpoint.

**Availability**: *always*  
**Launch Parameter**: *vnd_canvas_submission_history_url*  

```
"api/lti/assignments/{assignment_id}/submissions/{submission_id}/history"
```
## Canvas.file.media.id


**Availability**: *when an attachment is present and it has either a media object or media entry id defined*  



## Canvas.file.media.type


**Availability**: *when an attachment is present and has a media object defined*  



## Canvas.file.media.duration


**Availability**: *when an attachment is present and has a media object defined*  



## Canvas.file.media.size


**Availability**: *when an attachment is present and has a media object defined*  



## Canvas.file.media.title


**Availability**: *when an attachment is present and has a media object defined*  



## Canvas.file.usageRights.name


**Availability**: *when an attachment is present and has usage rights defined*  



## Canvas.file.usageRights.url


**Availability**: *when an attachment is present and has usage rights defined*  



## Canvas.file.usageRights.copyrightText


**Availability**: *when an attachment is present and has usage rights defined*  



## com.instructure.Course.accept_canvas_resource_types
Returns the types of resources that can be imported to the current page, forwarded from the request.
Value is a comma-separated array of one or more values of: ["assignment", "assignment_group", "audio",
"discussion_topic", "document", "image", "module", "quiz", "page", "video"].

**Availability**: *always*  
**Launch Parameter**: *com_instructure_course_accept_canvas_resource_types*  

```
"page"
"module"
"assignment,discussion_topic,page,quiz,module"
```
## com.instructure.Course.canvas_resource_type
Returns the target resource type for the current page, forwarded from the request.
Value is the largest logical unit of the page. Possible values are: ["assignment", "assignment_group",
"audio", "discussion_topic", "document", "image", "module", "quiz", "page", "video"]
  on Pages Index -> 'page'
  on Modules -> 'module'
  and so on.

**Availability**: *always*  
**Launch Parameter**: *com_instructure_course_canvas_resource_type*  

```
page
```
## com.instructure.Course.allow_canvas_resource_selection
Returns whether a content can be imported into a specific group on the page, forwarded from the request.
True for Modules page and Assignment Groups page. False for other content index pages.

**Availability**: *always*  
**Launch Parameter**: *com_instructure_course_allow_canvas_resource_selection*  

```
true
```
## com.instructure.Course.available_canvas_resources
Returns a JSON-encoded list of content groups which can be selected, providing ID and name of each group,
forwarded from the request.
Empty value if com.instructure.Course.allow_canvas_resource_selection is false.

**Availability**: *always*  
**Launch Parameter**: *com_instructure_course_available_canvas_resources*  

```
[{"id":"3","name":"First Module"},{"id":"5","name":"Second Module"}]
```
