Once you have successfully installed the OpenHIM core and console and you are able to successfully access the console at http://localhost:9000 we can proceed to create a basic channel and client so that we can send a test request through the OpenHIM core.
A Client is usually some system that you want to be able to send request to the OpenHIM. Setting up a client allows the OpenHIM to authenticate requests. A Channel defines a path that a request will take through the OpenHIM. It describes one more routes for the request to be forwarded to, which clients are allowed to use this channel, which requests are to be directed to this channel and many more options that allow you to control what happens for a particular request.
To manage clients and channels you will need to log into the OpenHIM console and then you may follow the steps below.
Note - Only an Admin user has the permission to Add/Edit/Delete a Client or Channel
Follow the below steps to successfully create/update a Client
- Navigate to the Clients page on the OpenHIM Console.
- Here you will be presented with a list of all the created Clients
- Click on the blue + Client button to open a popup modal box where you will supply the Client details OR click on one of the existing Clients to open up the popup modal with the Client's saved details.
- Supply all the required fields (marked with a *) and click the blue Save changes button when completed.
There are many fields available, to find a detailed explanation of all possible fields, please refer to the Clients documentation page
Follow the below steps to successfully create/update a Channel
- Navigate to the Channels menu option found in the left sidebar.
- On the Channels page you will be presented with a list of all the created Channels
- Click on the blue "+ Channel" button to open a popup modal box where you will supply the Channel details OR click on one of the existing Channels to open up the popup modal with the Channels' saved details.
- Supply all the required fields and click the blue "Save changes" button when completed.
The two most important fields to supply are the URL Pattern field and the Allowed roles and clients field. The URL Pattern field describes which incoming requests should be sent down this channel. It does this by looking at the URL of the incoming request and testing if it matches the RegEx that you supply in this field.
Note, only the first url matched channel that is found receives the request for processing.
The Allowed roles and clients field identifies which clients are allowed to send requests to this channel. If a request matches a private channel but the client system is not specified in this field or a role which contains the client is not specified in this field then the request will be denied access to the channel as it could not successfully authenticate the the supplied authentication details to those linked to the channel.
There are many fields that you may supply, to find a detailed explanation of all the available fields, please refer to the Channels documentation page
For this example, we will be creating a very basic channel that requires client authentication details to verify the request is authorized for the specific channel being requested.
- Import Config
Lets proceed by supplying the below details within our relevant sections to complete this configuration of our channel and client.
- client Name:
Health Level 7
- Add new Role:
- Basic Auth Password:
- Basic Info Tab:
HL7 Patient example Channel
- Request Matching Tab:
- Channel Authentication:
- Client to access this channel:
- Routes Tab: Add new route:
HL7 patient example Route
- Route Secured:
- Route Path:
Once you have configured your client and channel as described in the above example, you should now be able to successfully make a authenticated request through the OpenHIM to fetch the example HL7 FHIR Patient object.
Execute the below command in your terminal to see the output of the request.
curl "http://localhost:5001/hl7-patient-example" -H "Authorization: Basic $(echo -n HL7:hl7password | base64)"
You can also use any alternative 3rd party client to send this request through the OpenHIM. An example of a 3rd party client is Postman