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This sample app demonstrates how to implement link unfurling in a Teams messaging extension using the Bot Framework v4.
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office-365
csharp
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10/17/2019 13:38:25 PM
officedev-microsoft-teams-samples-msgext-link-unfurling-csharp

Teams Link Unfurl Bot C#

This sample demonstrates a Teams bot that utilizes link unfurling within messaging extensions, built with the Bot Framework v4. Users can experience seamless integration in Teams and Outlook, featuring capabilities like search commands and enhanced link previews.

This bot has been created using Bot Framework, it shows how to create a simple bot that performs link unfurling in Teams.

Included Features

  • Bots
  • Message Extensions
  • Search Commands
  • Link Unfurling

Interaction with Messaging Extension Link Unfurling

msgext-link-unfurling

Try it yourself - experience the App in your Microsoft Teams client

Please find below demo manifest which is deployed on Microsoft Azure and you can try it yourself by uploading the app manifest (.zip file link below) to your teams and/or as a personal app. (Sideloading must be enabled for your tenant, see steps here).

Teams Link Unfurl Bot: Manifest

Prerequisites

Run the app (Using Teams Toolkit for Visual Studio)

The simplest way to run this sample in Teams is to use Teams Toolkit for Visual Studio.

  1. Install Visual Studio 2022 Version 17.10 Preview 4 or higher Visual Studio
  2. Install Teams Toolkit for Visual Studio Teams Toolkit extension
  3. In the debug dropdown menu of Visual Studio, select Dev Tunnels > Create A Tunnel (set authentication type to Public) or select an existing public dev tunnel.
  4. In the debug dropdown menu of Visual Studio, select default startup project > Microsoft Teams (browser)
  5. In Visual Studio, right-click your TeamsApp project and Select Teams Toolkit > Prepare Teams App Dependencies
  6. Using the extension, sign in with your Microsoft 365 account where you have permissions to upload custom apps.
  7. Select Debug > Start Debugging or F5 to run the menu in Visual Studio.
  8. In the browser that launches, select the Add button to install the app to Teams.

If you do not have permission to upload custom apps (sideloading), Teams Toolkit will recommend creating and using a Microsoft 365 Developer Program account - a free program to get your own dev environment sandbox that includes Teams.

Setup

Note these instructions are for running the sample on your local machine, the tunnelling solution is required because the Teams service needs to call into the bot.

  1. Clone the repository

    git clone https://github.com/OfficeDev/Microsoft-Teams-Samples.git

  2. Setup for Bot

    In Azure portal, create a Azure Bot resource.

    • For bot handle, make up a name.
    • Select "Use existing app registration" (Create the app registration in Microsoft Entra ID beforehand.)
    • If you don't have an Azure account create an Azure free account here

    In the new Azure Bot resource in the Portal,

  3. If you are using Visual Studio

    • Launch Visual Studio
    • File -> Open -> Project/Solution
    • Navigate to samples/msgext-link-unfurling/csharp folder
    • Select TeamsLinkUnfurling.csproj or TeamsLinkUnfurling.slnfile

  4. Run ngrok - point to port 3978

    ngrok http 3978 --host-header="localhost:3978"

    Alternatively, you can also use the dev tunnels. Please follow Create and host a dev tunnel and host the tunnel with anonymous user access command as shown below:

    devtunnel host -p 3978 --allow-anonymous

  5. Update the appsettings.json configuration for the bot to use the MicrosoftAppId, MicrosoftAppPassword, MicrosoftAppTenantId generated in Step 2 (App Registration creation). (Note the App Password is referred to as the "client secret" in the azure portal and you can always create a new client secret anytime.)

    • Set "MicrosoftAppType" in the appsettings.json. (Allowed values are: MultiTenant(default), SingleTenant, UserAssignedMSI)

  6. Run your bot, either from Visual Studio with F5 or using dotnet run in the appropriate folder.

  7. This step is specific to Teams.

    • Edit the manifest.json contained in the appPackage folder to replace your Microsoft App Id (that was created when you registered your bot earlier) everywhere you see the place holder string <<YOUR-MICROSOFT-APP-ID>> (depending on the scenario the Microsoft App Id may occur multiple times in the manifest.json)
    • Zip up the contents of the appPackage folder to create a manifest.zip (Make sure that zip file does not contains any subfolder otherwise you will get error while uploading your .zip package)
    • Upload the manifest.zip to Teams (In Teams Apps/Manage your apps click "Upload an app". Browse to and Open the .zip file. At the next dialog, click the Add button.)

Note: If you are facing any issue in your app, please uncomment this line and put your debugger for local debug.

Running the sample

Add-App

Note the Teams manifest.json for this sample also includes a Search Query. This Messaging Extension is only introduced in order to enable installation, because there is no mechanism for installing a link unfurling feature in isolation.

If you copy and paste the link https://teamstestdomain.com/teams/csharp, it wil unfurl inside compose area.

  • Note : To enable link unfurling for your domain, add your domain to the manifest.json file under message handlers. Link-Unfurling

Outlook on the web

  • To view your app in Outlook on the web.

  • Go to Outlook on the weband sign in using your dev tenant account.

After opening Outlook web, click the "New mail" button.

Open New Mail

on the tool bar on top,select Apps icon. Your sideloaded app title appears among your installed apps

OpenAppIcon

Select your app icon to launch your app in Office on the web

Search in Extension

Deploy the bot to Azure

To learn more about deploying a bot to Azure, see Deploy your bot to Azure for a complete list of deployment instructions.

Further reading