Save all attachments from Basecamp message body.

basecampAttachmentScraper.js

/*
* Saves from URLs like https://basecamp.com/{{accountId?}}/projects/{{projectId?}}/messages/{{messageId}}
* Assumptions (true as of 2014-11-07):
*   - jQuery available as global $
*   - sufficient selector assumes attachment links have attribute 'data-attachment-id'
*/

function save (url, options) {
    options || (options = {});

    var filename,
        saver,
        saveEvent;

    // Try to get filename from options, generative, or fallback
    filename = options.as || options.filename || url.split("/").pop() || "meow";

    // Make a fake link for saving
    saver = document.createElement('a');
    saver.href = url;
    saver.target = "_blank";
    saver.download = filename;

    // bind and trigger a fake click event
    saveEvent = document.createEvent('Event');
    saveEvent.initEvent('click', true, true);
    saver.dispatchEvent(saveEvent);

    // Release the URL reference after saving
    window.URL.revokeObjectURL(saver.href);
};

$('a[data-attachment-id]').each(function (idx, item) { item.href && save(item.href); });