share a file to a community user through APEX

Question

I want to share/post a document to a Community user through APEX . Suggest some work around for this through APEX code.

Answer 1

Attachment myAttachment =[SELECT Id, Name,Body,Description,ContentType FROM  Attachment where Id =:myFile.Attachment_ID__c];

String communityId = 'myCommunityId';

// CREATE A FEED_ITEM_TEXT
ConnectApi.MessageBodyInput messageInput = new ConnectApi.MessageBodyInput();
messageInput.messageSegments = new List<ConnectApi.MessageSegmentInput>();

ConnectApi.TextSegmentInput textSegment = new ConnectApi.TextSegmentInput();
textSegment.text = shareComment; 

messageInput.messageSegments.add(textSegment);

ConnectApi.FeedItemInput input = new ConnectApi.FeedItemInput();
input.body = messageInput;

// POST FILE_FEED_ITEM 
ConnectApi.NewFileAttachmentInput fileIn = new ConnectApi.NewFileAttachmentInput();
fileIn.title = fetchDigitalChatterFile.Attachment_Name__c;                   
input.attachment = fileIn;

Blob userFile = myAttachment.Body; 

ConnectApi.BinaryInput feedBinary = new ConnectApi.BinaryInput(userFile,myAttachment.ContentType,myAttachment.name);

// PARAMETERS(communityId, feedType, subjectId, input,filebody);
ConnectApi.FeedItem feadItem = ConnectApi.ChatterFeeds.postFeedItem(communityId, ConnectApi.FeedType.Record,'share To Id',input,feedBinary);

Answer 2

OP's issue which is Community users can only access files that were uploaded INTO that community. (ie when an internal user with a full SFDC license uploads a file, Community users can't see it, even though the community users have access to view the record, AND prior to enabling Files, Community users could see Attachments that internal users uploaded.)

This single line of code for an APEX Trigger worked to flag all uploaded files so that all users in the Community could see them:

UpdateContentDocumentLinkVisibilityOnInsert on ContentDocumentLink (before insert) { for(ContentDocumentLink l:Trigger.new)l.Visibility='AllUsers'; }

Answer 3

Per the Apex Docs, Apex sharing is not available for Communities. Sharing sets are available as an alternative except in the case of Partner Communities. You don't say what kind of Community you have or the kind of Document you need to share, so further guidance is difficult to provide.

Answer 4

A client of mine already had a ton of files uploaded by internal users that they wanted to make available to partner community users. I was able to use the code below in the developer console with execute anonymous.

// Gather existing opportunity file links
List<ContentDocumentLink> existingOpportunityFileLinks = [
    SELECT
        Id,
        ContentDocument.title,
        Visibility,
        LinkedEntityId,
        ContentDocumentId,
        ShareType
    FROM ContentDocumentLink
    WHERE
        LinkedEntityId IN (SELECT Id FROM Opportunity) // All opportunitities
        AND
        Visibility != 'AllUsers' // Don't need to reshare these; they're already shared
    LIMIT 100 // Do a few at a time and test
];

// Create new opportunity file links
List<ContentDocumentLink> newOpportunityFileLinks = new List<ContentDocumentLink>();
for(ContentDocumentLink existingFileLink : existingOpportunityFileLinks) {
    ContentDocumentLink newOpportunityFileLink = existingFileLink.clone();
    newOpportunityFileLink.Visibility = 'AllUsers'; // Make the file visibile to all users, both internal and external, who already have access to the linked opportunity records
    newOpportunityFileLinks.add(newOpportunityFileLink);
}

// Delete existing file links since we can't change the visibility field on already saved records
delete existingOpportunityFileLinks;

// Save new opportunity file links
insert newOpportunityFileLinks;