Finnish Implementation Guide for SMART App Launch
1.0.0 - trial-use
Finnish Implementation Guide for SMART App Launch
1.0.0 - trial-use
This page is part of the Finnish Implementation Guide for SMART App Launch (v1.0.0: STU 1) based on FHIR R4. This is the current published version. For a full list of available versions, see the Directory of published versions
An example in Apotti Ekosysteemi, launching the development version of the Sensotrend app (client).
Sensotrend’s app has been set up in the Epic on FHIR portal and the Client ID has been downloaded to Apotti, and a launch button has been configured in Apotti.
When a practitioner clicks the Sensotrend button on the EHR, the EHR generates a launch request to the client:
GET https://dev.sensotrend.fi/api/smart/launch?iss=https%3A%2F%2Fgw.apottiekosysteemi.fi%2FInterconnect-FHIR-EKO01%2Fapi%2FFHIR%2FSTU3&launch=o7mz2mMwXCgpyJ6ygi6NY7dRMI4c4ucIWlD_1o-j1mNJAAV_ESS_wSXxUtpGk2qmro4jk5c1zL744IuNZs_EZC4XRPns6LESRo_3RocY0KoJv9u8MngnWmJUSv3g7PM5
The client app can use the iss parameter to decide whether to process the request at all. In this
case we want to continue.
In order to learn more about the system that is launching the app, the client app fetches the
server metadata (based on the iss parameter and the .well-known location):
GET https://gw.apottiekosysteemi.fi/Interconnect-FHIR-EKO01/api/FHIR/STU3/.well-known/smart-configuration
The response is:
{
"authorization_endpoint": "https:\/\/gw.apottiekosysteemi.fi\/Interconnect-FHIR-EKO01\/oauth2\/authorize",
"token_endpoint": "https:\/\/gw.apottiekosysteemi.fi\/Interconnect-FHIR-EKO01\/oauth2\/token",
"token_endpoint_auth_methods_supported": ["client_secret_post", "client_secret_basic", "private_key_jwt"],
"scopes_supported": ["epic.scanning.dmsusername", "fhirUser", "launch", "openid", "profile"],
"response_types_supported": ["code"],
"capabilities": [
"launch-ehr",
"launch-standalone",
"client-public",
"client-confidential-symmetric",
"context-banner",
"context-style",
"context-ehr-patient",
"context-ehr-encounter",
"context-standalone-patient",
"permission-offline",
"permission-patient",
"permission-user",
"sso-openid-connect"
]
}
The client app can cache this information and use a conditional request on subsequent launches to verify whether the information is still up to date (using the information present in the HTTP header of the above response).
The client then redirects the launch request to the authorization endpoint. The request includes
the scope, the redirect_url, and the client_id known to the client app. The request could
also include the client secret, in case of a confidential app. Importantly, the client app sets a
one time state parameter through which it can identify the redirect back from the auth server.
GET https://gw.apottiekosysteemi.fi/Interconnect-FHIR-EKO01/oauth2/authorize?aud=https%3A%2F%2Fgw.apottiekosysteemi.fi%2FInterconnect-FHIR-EKO01%2Fapi%2FFHIR%2FSTU3&scope=launch+openid+fhirUser+patient%2FObservation.read+patient%2FOrganization.read+patient%2FPatient.read+user%2FPractitioner.read+user%2FPractitionerRole.read+launch+launch%2Fencounter+launch%2Fpatient&response_type=code&launch=o7mz2mMwXCgpyJ6ygi6NY7dRMI4c4ucIWlD_1o-j1mNJAAV_ESS_wSXxUtpGk2qmro4jk5c1zL744IuNZs_EZC4XRPns6LESRo_3RocY0KoJv9u8MngnWmJUSv3g7PM5&state=2c45ddb7-c830-4ef4-8922-7360b618768f&redirect_uri=https%3A%2F%2Fdev.sensotrend.fi%2Fapi%2Fauthenticate%2Fsmart&client_id=ba932e7a-d9c9-4d79-af8b-48159a727b01
The authorization server approves the request and redirects back to the indicated redirect_uri,
together with the state parameter the client app issued, and a code that the client app can use
to fetch the access token and context information.
GET http://dev.sensotrend.fi/api/authenticate/smart?code=2Q7gMpAsZuZdJeRrQHsKF0JW9HxodF5CrFjWWihM9STOkCutWYPPG5dKGG6fuLe_5ddxgSoBH2coxAfeQW_CrKTSS02RXsoxXN8YZO2AIznbB4iiBQzQcEIs5mZ_-U6U&state=2c45ddb7-c830-4ef4-8922-7360b618768f
The client app exchanges the code to access token and context information with a POST request
to the token endpoint (retrieved earlier with the server metadata).
POST 'code=2Q7gMpAsZuZdJeRrQHsKF0JW9HxodF5CrFjWWihM9STOkCutWYPPG5dKGG6fuLe_5ddxgSoBH2coxAfeQW_CrKTSS02RXsoxXN8YZO2AIznbB4iiBQzQcEIs5mZ_-U6U&grant_type=authorization_code&redirect_uri=https%3A%2F%2Fdev.sensotrend.fi%2Fapi%2Fauthenticate%2Fsmart&client_id=ba932e7a-d9c9-4d79-af8b-48159a727b01'
The response is:
{
"access_token": "ODwdzFxnt2XPLkPN99X13HdgBy7v55nZuysW2RYbVQl9NnBVMuQv8ER5_3JDD1oPiRSp6EWS2LQ6Lv2GHtrSx2a8YHJRakSV1ZkvGVRN9YSAN7CaPA9GQ_Dc_0iS7MXe",
"token_type": "Bearer",
"expires_in": 3600,
"scope": "user/Appointment.read user/DocumentReference.write user/Encounter.Read user/Encounter.read user/Observation.Read user/Observation.Write user/Observation.read user/Observation.write user/Organization.read user/Patient.Read user/Patient.read user/Practitioner.Read user/Practitioner.read user/PractitionerRole.read launch launch/patient openid",
"state": "2c45ddb7-c830-4ef4-8922-7360b618768f",
"__epic.dstu2.patient": "TsRGy4u8N.QB9ggWS-RNnKLIRbxmCIW4Fvyw1-8bXPawB",
"deptID": "490771",
"id_token": "eyJhbGciOiJSUzI1NiIsImtpZCI6ImFlOHhRNTBiMFd3UGNmNjNYWENCcms4anFJUlErSVBwNTg0VlVLbmRwZXM9IiwidHlwIjoiSldUIn0.eyJhdWQiOiJiYTkzMmU3YS1kOWM5LTRkNzktYWY4Yi00ODE1OWE3MjdiMDEiLCJleHAiOjE2NzQ1NTYwNTQsImlhdCI6MTY3NDU1NTc1NCwiaXNzIjoiaHR0cHM6Ly9ndy5hcG90dGlla29zeXN0ZWVtaS5maS9JbnRlcmNvbm5lY3QtRkhJUi1FS08wMS9vYXV0aDIiLCJzdWIiOiJlaEhqcnJCbDJ1VWJDMC5vbG9DVFJVU2dqbzNjUGFaZVFaaHJiNDgxeWx4dzMifQ.ZL2NAp1g3BHMpJMdMn7IUOqhaBokSUjdc33k6UPYx-FA9TyAlneJDnxEJ8gVfRIck5Ix3zanyuBt0wOYOSfH160Jng54Qmhqgo_HRHHQzqoz-pS7jUd_LSrFpbrEKTBfsvrirhfExT9nGkzhPPMwfDzv5HSXR56WCljpXbPS9JkZv2NgQxc0PDEByPdFo_OH1icYa9z7b8Xq_MqwUG27bnDc3jzBTq9QBrQUO6jEYEJaZIc4KaakizHPzjYaf-Av39ZIiw2FnG59xawHEwP77xsYaOJA9sMwMeXvvshwlyN9EM152JbxjcYUWhJw07se-VRtKqI_f_O2BYp3Ly89KQ",
"loginDepartment": "eYvrM0-vLt2R54-Oq4G7jgA3",
"need_patient_banner": "true",
"patient": "e5Lq8kpLjGQOrUOSyW1Bwwg3",
"smart_style_url": "https://gw.apottiekosysteemi.fi/Interconnect-FHIR-EKO01/api/epic/2016/EDI/HTTP/style/100016/I0YyRkFGOHwjQzEyMTI3fCMwMEFBRkZ8I0UwRjNFRXwjODZCNTQwfCMwMDAwMDB8MHB4fDEwcHh8fEFyaWFsLCBzYW5zLXNlcmlmfCdTZWdvZSBVSScsIEFyaWFsLCBzYW5zLXNlcmlmfHw%3D.json"
}
The parameters __epic.dstu2.patient, deptID, and loginDepartment are Epic specific
parameters, the rest are defined by the
SMART App Launch specification.
In this case, the client app uses the deptID to know the part of the organization the call comes from. The client app wants to limit the visibility of the app and the data to only specific clinics within Apotti.
The standard way to do this would be through the
fhirContext
parameter.
The client app can now use the access_token to fetch more information.
The client can decode the id_token to find out more about the person launching the app. It could
be a patient, accessing the app through the patient portal, but in this case it is a practitioner.
The client app SHOULD verify the signature of the id_token. The public key required for
verification can be found through the .well-known/openid-configuration, in this case with:
GET https://gw.apottiekosysteemi.fi/Interconnect-FHIR-EKO01/api/FHIR/STU3/.well-known/openid-configuration
The client app can then use the key set uri from the jwks_uri property to validate the token.
An alternative is to use the token introspection endpoint.
Generated Narrative: AuditEvent
Resource AuditEvent "apotti-ehr-launch-by-practitioner"
type: User Authentication (Details: DICOM code 110114 = 'User Authentication', stated as 'User Authentication')
subtype: Application Start (Details: DICOM code 110120 = 'Application Start', stated as 'Application Start')
action: E
recorded: Jan 24, 2023, 12:20:18 PM
agent
who: : Apotti Ekosysteemi
requestor: true
agent
who: : Sensotrend Oy
requestor: false
| Observer | Type |
| : Sensotrend Oy | Web Server (Details: http://terminology.hl7.org/CodeSystem/security-source-type code 3 = 'Web Server', stated as 'Web Server') |
Sensotrend’s client app manages patient-generated health data and therefore also manages the permissions that patients grant to different parties to access their data.
The details of that mechanism can be viewed in the video below. This video shows the above example in action. In this case the app is not launched from Apotti, rather from the Epic on FHIR portal.
IG © 2022+ HL7 Finland ry. Package hl7.fhir.fi.smart#1.0.0 based on FHIR 4.0.1. Generated 2023-11-09
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