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using Gdk;
using GLib;
using Gee;
using Xmpp;
using Xmpp.Xep;
using Dino.Entities;
namespace Dino {
public interface FileMetadataProvider : Object {
public abstract bool supports_file(File file);
public abstract async void fill_metadata(File file, Xep.FileMetadataElement.FileMetadata metadata);
}
class GenericFileMetadataProvider: Dino.FileMetadataProvider, Object {
public bool supports_file(File file) {
return true;
}
public async void fill_metadata(File file, Xep.FileMetadataElement.FileMetadata metadata) {
FileInfo info = file.query_info("*", FileQueryInfoFlags.NONE);
metadata.name = info.get_display_name();
metadata.mime_type = info.get_content_type();
metadata.size = info.get_size();
metadata.date = info.get_modification_date_time();
var checksum_types = new ArrayList<ChecksumType>.wrap(new ChecksumType[] { ChecksumType.SHA256, ChecksumType.SHA512 });
var file_hashes = yield compute_file_hashes(file, checksum_types);
metadata.hashes.add(new CryptographicHashes.Hash.with_checksum(ChecksumType.SHA256, file_hashes[ChecksumType.SHA256]));
metadata.hashes.add(new CryptographicHashes.Hash.with_checksum(ChecksumType.SHA512, file_hashes[ChecksumType.SHA512]));
}
}
public class ImageFileMetadataProvider: Dino.FileMetadataProvider, Object {
public bool supports_file(File file) {
return file.query_info("*", FileQueryInfoFlags.NONE).get_content_type().has_prefix("image");
}
private const int[] THUMBNAIL_DIMS = { 1, 2, 3, 4, 8 };
private const string IMAGE_TYPE = "png";
private const string MIME_TYPE = "image/png";
public async void fill_metadata(File file, Xep.FileMetadataElement.FileMetadata metadata) {
Pixbuf pixbuf = new Pixbuf.from_stream(yield file.read_async());
metadata.width = pixbuf.get_width();
metadata.height = pixbuf.get_height();
float ratio = (float)metadata.width / (float) metadata.height;
int thumbnail_width = -1;
int thumbnail_height = -1;
float diff = float.INFINITY;
for (int i = 0; i < THUMBNAIL_DIMS.length; i++) {
int test_width = THUMBNAIL_DIMS[i];
int test_height = THUMBNAIL_DIMS[THUMBNAIL_DIMS.length - 1 - i];
float test_ratio = (float)test_width / (float)test_height;
float test_diff = (test_ratio - ratio).abs();
if (test_diff < diff) {
thumbnail_width = test_width;
thumbnail_height = test_height;
diff = test_diff;
}
}
Pixbuf thumbnail_pixbuf = pixbuf.scale_simple(thumbnail_width, thumbnail_height, InterpType.BILINEAR);
uint8[] buffer;
thumbnail_pixbuf.save_to_buffer(out buffer, IMAGE_TYPE);
string base_64 = GLib.Base64.encode(buffer);
string uri = @"data:$MIME_TYPE;base64,$base_64";
Xep.JingleContentThumbnails.Thumbnail thumbnail = new Xep.JingleContentThumbnails.Thumbnail();
thumbnail.uri = uri;
thumbnail.media_type = MIME_TYPE;
thumbnail.width = thumbnail_width;
thumbnail.height = thumbnail_height;
metadata.thumbnails.add(thumbnail);
}
}
}
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