App Permissions in SharePoint

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Setting app permissions in SharePoint is a critical aspect of developing custom applications and add-ins. By using the AppPermissionRequests element, developers can define the necessary access levels required for their apps to function optimally without compromising security.

Understanding AppPermissionRequests

AppPermissionRequests is an XML element used in SharePoint to define the permissions required by an app to function correctly within the SharePoint environment.

The syntax of the AppPermissionRequests element consists of one or more AppPermissionRequest elements. Each AppPermissionRequest element defines a specific scope and the corresponding rights that the app should have within that scope.

<AppPermissionRequests AllowAppOnlyPolicy="true">
    <AppPermissionRequest Scope="http://sharepoint/content/sitecollection" Right="FullControl" />
    <AppPermissionRequest Scope="http://sharepoint/content/sitecollection/web" Right="FullControl" />
    <AppPermissionRequest Scope="http://sharepoint/social/tenant" Right="FullControl" />
    <AppPermissionRequest Scope="http://sharepoint/taxonomy" Right="Write" />
    <AppPermissionRequest Scope="http://sharepoint/search" Right="QueryAsUserIgnoreAppPrincipal" />
</AppPermissionRequests>

Let’s break down the example provided:

AllowAppOnlyPolicy="true"

This attribute allows the app to act with app-only permissions, meaning the app will not run on behalf of any specific user but will have its own elevated privileges.

<AppPermissionRequest Scope="http://sharepoint/content/sitecollection" Right="FullControl" />

This element requests Full Control permissions for the entire site collection. With Full Control, the app can perform all operations within the specified site collection.

<AppPermissionRequest Scope="http://sharepoint/content/sitecollection/web" Right="FullControl" />

This element requests Full Control permissions for a specific subsite within the site collection. This is more restrictive than the previous permission, limiting the app's access to a single subsite.

<AppPermissionRequest Scope="http://sharepoint/social/tenant" Right="FullControl" />

This element requests Full Control permissions for the social features at the tenant level. This allows the app to manage social aspects of the SharePoint tenant.

<AppPermissionRequest Scope="http://sharepoint/taxonomy" Right="Write" />

This element requests Write permissions for the taxonomy service. The app can create and update taxonomy-related items.

<AppPermissionRequest Scope="http://sharepoint/search" Right="QueryAsUserIgnoreAppPrincipal" />

This element requests QueryAsUserIgnoreAppPrincipal permissions for the search service. The app can execute search queries on behalf of users while ignoring its own identity.

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