/// <summary>
/// Given a revision, read its _attachments dictionary (if any), convert each attachment to a
/// AttachmentInternal object, and return a dictionary mapping names->CBL_Attachments.
/// </summary>
/// <remarks>
/// Given a revision, read its _attachments dictionary (if any), convert each attachment to a
/// AttachmentInternal object, and return a dictionary mapping names->CBL_Attachments.
/// </remarks>
/// <exception cref="Couchbase.Lite.CouchbaseLiteException"></exception>
internal IDictionary<String, AttachmentInternal> GetAttachmentsFromRevision(RevisionInternal rev)
{
var revAttachments = rev.GetPropertyForKey("_attachments").AsDictionary<string, object>();
if (revAttachments == null || revAttachments.Count == 0 || rev.IsDeleted())
{
return new Dictionary<string, AttachmentInternal>();
}
var attachments = new Dictionary<string, AttachmentInternal>();
foreach (var name in revAttachments.Keys)
{
var attachInfo = revAttachments.Get(name).AsDictionary<string, object>();
var contentType = (string)attachInfo.Get("content_type");
var attachment = new AttachmentInternal(name, contentType);
var newContentBase64 = (string)attachInfo.Get("data");
if (newContentBase64 != null)
{
// If there's inline attachment data, decode and store it:
byte[] newContents;
try
{
newContents = StringUtils.ConvertFromUnpaddedBase64String (newContentBase64);
}
catch (IOException e)
{
throw new CouchbaseLiteException(e, StatusCode.BadEncoding);
}
attachment.SetLength(newContents.Length);
var outBlobKey = new BlobKey();
var storedBlob = Attachments.StoreBlob(newContents, outBlobKey);
attachment.SetBlobKey(outBlobKey);
if (!storedBlob)
{
throw new CouchbaseLiteException(StatusCode.StatusAttachmentError);
}
}
else
{
if (attachInfo.ContainsKey("follows") && ((bool)attachInfo.Get("follows")))
{
// "follows" means the uploader provided the attachment in a separate MIME part.
// This means it's already been registered in _pendingAttachmentsByDigest;
// I just need to look it up by its "digest" property and install it into the store:
InstallAttachment(attachment, attachInfo);
}
else
{
// This item is just a stub; validate and skip it
if (((bool)attachInfo.Get("stub")) == false)
{
throw new CouchbaseLiteException("Expected this attachment to be a stub", StatusCode.
BadAttachment);
}
var revPos = Convert.ToInt64(attachInfo.Get("revpos"));
if (revPos <= 0)
{
throw new CouchbaseLiteException("Invalid revpos: " + revPos, StatusCode.BadAttachment);
}
continue;
}
}
// Handle encoded attachment:
string encodingStr = (string)attachInfo.Get("encoding");
if (encodingStr != null && encodingStr.Length > 0)
{
if (Runtime.EqualsIgnoreCase(encodingStr, "gzip"))
{
attachment.SetEncoding(AttachmentEncoding.AttachmentEncodingGZIP
);
}
else
{
throw new CouchbaseLiteException("Unnkown encoding: " + encodingStr, StatusCode.BadEncoding
);
}
attachment.SetEncodedLength(attachment.GetLength());
if (attachInfo.ContainsKey("length"))
{
attachment.SetLength((long)attachInfo.Get("length"));
}
}
if (attachInfo.ContainsKey("revpos"))
{
var revpos = Convert.ToInt32(attachInfo.Get("revpos"));
attachment.SetRevpos(revpos);
}
attachments[name] = attachment;
}
return attachments;
}
/// <exception cref="Couchbase.Lite.CouchbaseLiteException"></exception>
internal void InstallAttachment(AttachmentInternal attachment, IDictionary<String, Object> attachInfo)
{
var digest = (string)attachInfo.Get("digest");
if (digest == null)
{
throw new CouchbaseLiteException(StatusCode.BadAttachment);
}
if (PendingAttachmentsByDigest != null && PendingAttachmentsByDigest.ContainsKey(digest))
{
var writer = PendingAttachmentsByDigest.Get(digest);
try
{
var blobStoreWriter = writer;
blobStoreWriter.Install();
attachment.SetBlobKey(blobStoreWriter.GetBlobKey());
attachment.SetLength(blobStoreWriter.GetLength());
}
catch (Exception e)
{
throw new CouchbaseLiteException(e, StatusCode.StatusAttachmentError);
}
}
}