greasemonkey-springerlink-downloader

greasemonkey-springerlink-downloader.js

// ==UserScript==
// @name        Springer Liberator
// @namespace   http://userscripts.org/springer-liberator
// @description A script to scrape articles from  Springer
// @include     http://link.springer.com/*
// @version     1
// @grant       none
// ==/UserScript==
 
window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
window.URL = window.URL || window.webkitURL;
 
 
// Function to pad strings
function pad(n, width, z) {
  z = z || '0';
  n = n + '';
  return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
}
 
$(document).ready(function(){
 
    // Create new liberate button
    previewData = $('span.icon-view').html();
    liberateBtn = document.createElement('span');
    $(liberateBtn).addClass("action").addClass("icon-download").html(previewData); // Copy preview button data
    previewUrl = $(liberateBtn).children("a").attr("href");
    $(liberateBtn).children("a").click(function() { $.downloadImages(previewUrl); });
    $(liberateBtn).children("a").attr("href","#");
    $(liberateBtn).children("a").html("Liberate"); // Change link title
    $(liberateBtn).children("a").addClass("liberate")
    $(liberateBtn).children("a").removeAttr("viewtype")
    $('span.icon-view').after(liberateBtn);
    //<progress min="0" max="100" value="0">0% complete</progress>
    
    // Only start download on click
    $.downloadImages = function(previewUrl){
 
        // Get document length
        citation_firstpage   = $('meta[name=citation_firstpage]').attr("content");
        citation_lastpage   = $('meta[name=citation_lastpage]').attr("content");
        citation_length      = citation_lastpage - citation_firstpage + 1;
 
        // Create list of URL's to download
        previewUrls = [];
        baseUrl = previewUrl.substr(0,previewUrl.lastIndexOf("/")+1);
        for (page=0; page<citation_length; page++) {
            previewUrls.push(baseUrl+pad(page,3)+".png");
        }
 
        //Loop through and retrieve each image
        previewBlobs = [];
                
        var xhr = new XMLHttpRequest();
        xhr.open('GET', previewUrls.pop(), true);
        xhr.responseType = 'blob';
 
        xhr.onload = function() {   
            if(this.status == 200) {
                blob = this.response;
                previewBlobs.push(blob);
            }
            
            // When downloads are complete call upload function
            if(previewUrls.length == 0){
                uploadFiles(previewBlobs);
                return;
            }
            
            xhr.open("GET", previewUrls.pop(), true);
            xhr.send();
            
        };
        xhr.send(); 
 
        // Script to send all images to the server
        function uploadFiles(blobs) {
 
            var formData = new FormData();
            
            formData.append("title", $('meta[name=citation_title]').attr("content"));
            formData.append("doi", $('meta[name=citation_doi]').attr("content"));
 
            for (var i = 0, file; file = blobs[i]; ++i) {
                formData.append("images[]", file, pad(i,3)+".png");
            }
 
            var xhr = new XMLHttpRequest();
            xhr.open('POST', "http://localhost/upload.php", true);
            
            xhr.onload = function() { 
                alert(xhr.status + " - " + xhr.response); 
                if(xhr.status == 200){
                    document.location = xhr.response;
                }
                alert("upload done");
            };
            
            xhr.send(formData);  // multipart/form-data
            alert("upload sent");
        }
    }
});