Firebase Part 6 - Blur Image

blurImage.ts

function blurImage(object, userDocRef) {
    const filePath = object.name;
    const bucket = gcs.bucket(object.bucket);
    const fileName = filePath.split('/').pop();
    const tempLocalFile = `/tmp/${fileName}`;

    // Download file from bucket.
    return bucket.file(filePath)
        .download({
            destination: tempLocalFile
        })
        .then(() => {
            console.log('Image has been downloaded to', tempLocalFile);
            // Blur the image using ImageMagick.
            return exec(`convert ${tempLocalFile} -channel RGBA -blur 0x24 ${tempLocalFile}`);
        })
        .then(() => {
            console.log('Image has been blurred');
            // Uploading the Blurred image back into the bucket.
            return bucket.upload(tempLocalFile, {
                destination: filePath
            });
        })
        .then(() => {
            console.log('Blurred image has been uploaded to', filePath);
            // Indicate that the message has been moderated.
            return userDocRef.update({
                locked: true
            });
        })
        .then(() => {
            console.log('Marked the image as moderated in the database.');
            return fs.unlinkSync(tempLocalFile);
        });
}