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Steps to set up backend

Below instruction is to setup backend to automatically upload the generated files in the android app to the Blob store.

Setting up the azure function

  1. Search for Function App in the market place
  2. Click on create a function app, in the form that appears:
  3. Modify the prefilled fields if required.
  4. Fill in the azure function app name. Example: smartKcFunctions
  5. Choose runtime to be Python
  6. Choose operating system as Linux
  7. Click on Next > Hosting
  8. Select a storage account or else create a new storage account if there is no existing storage account
  9. Click on Review + Create from top

Setup local environment for Azure function

Once, you have created a function app, you need to create a local environment to publish a new function under the created function app.

Prerequisites

  1. The Azure Functions Core Tools version 4.x.
  2. Python versions that are supported by Azure Functions. For more information, see How to install Python.
  3. Visual Studio Code
  4. The Python extension for Visual Studio Code.
  5. The Azure Functions extension for Visual Studio Code, version 1.8.3 or a later version.

Create a local project

  1. Open a new empty folder with Visual Studio Code
  2. Choose the Azure icon in the Activity bar. Then in the Workspace (local) area, select the + button
  3. Choose Create HTTP function
  4. Select Python when prompted for select a language.
  5. Select Skip virtual environment when prompted for selecting interpreter path.
  6. Name your Http function. For eg. fileUploader.
  7. From the github repository, Under the folder azure_function/uploader/smart_kc_test_uploader copy files function.json and host.json and paste it to your respective function.json and host.json
  8. Copy the above step with azure_function/uploader/requirements.txt and paste it to your respective requirements.txt
  9. Make sure the app runs by typing: func start in the terminal open inside azure_function/uploader

Publish the function

  1. Publish the function by running the command func azure functionapp publish [YourFunctionAppName]

Set Environment for the function

Certain variables need to be setup for the azure function. Follow these steps to set this up:

  1. Go to the Azure Function resource
  2. Click on the Configuration under Settings section
  3. Under Application settings tab click on New application setting
  4. On the new dialogue box that appears, enter name of the variable as upload_secret and put in a strong secret.
  5. Click OK to save the variable.
  6. Click Save at the top to save the application settings.
  7. Click Continue on the warning if it appears.

Give Blob permissions to Azure function

To upload files in the blob storage azure function needs certain permissions. Follow below steps to set it up.

  1. Go to your Azure function App.
  2. Click on Identity under Settings
  3. Under the System Assigned tab, turn the Status switch to On and click Save on the top.
  4. After you click Save, Click the button that will appear as Add Azure Role Assignments.
  5. On the new page that appears, Click Add role Assignments.
  6. Next, select scope as Storage. Then, select a storage resource where you want the files to be uploaded. Further, select the role as Blob Storage Contributor role
  7. Click Save

Get URL for Azure function

To get the URL of Azure function, go to the function app in your azure portal. Under Funcions click the Azure function created by you and click on Get Function Url present on the top.

Use the credentials in the app

  1. Open the android app and click on UPDATE PREFS.
  2. Turn on the switch labelled as Upload Enabled
  3. Enter Azure function URL on the Upload URL field.
  4. Enter Uplaod Secret on the Upload Secret field.
  5. Click Save Now, the app can be used to upload images, simply click on Upload Files in the homescreen after clicking the images.