Matlab code to download a file from Google Drive and to save it locally

gistfile1.txt

fileName = 'file_00002_00002.tif';
fileId = '0B649boZqpYG1OEZnV21ncDVNcVk';
fileUrl = sprintf('https://drive.google.com/uc?export=download&id=%s', fileId);
request = matlab.net.http.RequestMessage();

% First request will be redirected to information page about virus scanning
% We can get a confirmation code from an associated cookie file
[~, infos] = sendRequest(matlab.net.URI(fileUrl), request);
confirmCode = '';
for j = 1:length(infos('drive.google.com').cookies)
    if ~isempty(strfind(infos('drive.google.com').cookies(j).Name, 'download'))
        confirmCode = infos('drive.google.com').cookies(j).Value;
        break;
    end
end
newUrl = strcat(fileUrl, sprintf('&confirm=%s', confirmCode));

% We now need to send another request to get the file.
% However, Matlab doesn't download the whole Tiff file, but only one frame.
[~, ~, history] = sendRequest(matlab.net.URI(newUrl), request);

% Thus we must use log information to find out a
% direct link and downalod it as a raw file
ind = arrayfun(@(x) ~isempty(strfind(x.URI.Host, 'googleusercontent')), history);
ind = find(ind, 1);

% we need the raw type in order to download the whole file and not just a single frame
options = weboptions('ContentType', 'raw');
imgData = webread(history(ind).URI.EncodedURI, options);
fid = fopen(fileName, 'wb');
fwrite(fid, imgData);
fclose(fid);

sendRequest.m

% Send HTTP request, get response and additional information in retInfos.
function [response, retInfos, history] = sendRequest(uri, request)

% uri: matlab.net.URI
% request: matlab.net.http.RequestMessage
% response: matlab.net.http.ResponseMessage

% matlab.net.http.HTTPOptions persists across requests to reuse  previous
% Credentials in it for subsequent authentications
persistent options 

% infos is a containers.Map object where: 
%    key is uri.Host; 
%    value is "info" struct containing:
%        cookies: vector of matlab.net.http.Cookie or empty
%        uri: target matlab.net.URI if redirect, or empty
persistent infos

if isempty(options)
    options = matlab.net.http.HTTPOptions('ConnectTimeout',20);
end

if isempty(infos)
    infos = containers.Map;
end
host = string(uri.Host); % get Host from URI
try
    % get info struct for host in map
    info = infos(char(host));
    if ~isempty(info.uri)
        % If it has a uri field, it means a redirect previously
        % took place, so replace requested URI with redirect URI.
        uri = info.uri;
    end
    if ~isempty(info.cookies)
        % If it has cookies, it means we previously received cookies from this host.
        % Add Cookie header field containing all of them.
        request = request.addFields(matlab.net.http.field.CookieField(info.cookies));
    end
catch
    % no previous redirect or cookies for this host
    info = [];
end

% Send request and get response and history of transaction.
[response, ~, history] = request.send(uri, options);
if response.StatusCode ~= matlab.net.http.StatusCode.OK
    return
end

% Get the Set-Cookie header fields from response message in
% each history record and save them in the map.
arrayfun(@addCookies, history)

% If the last URI in the history is different from the URI sent in the original 
% request, then this was a redirect. Save the new target URI in the host info struct.
targetURI = history(end).URI;
if ~isequal(targetURI, uri)
    if isempty(info)
        % no previous info for this host in map, create new one
        infos(char(host)) = struct('cookies',[],'uri',targetURI);
    else
        % change URI in info for this host and put it back in map
        info.uri = targetURI;
        infos(char(host)) = info;
    end
end
retInfos = infos;

    function addCookies(record)
        % Add cookies in Response message in history record
        % to the map entry for the host to which the request was directed.
        %
        ahost = record.URI.Host; % the host the request was sent to
        cookieFields = record.Response.getFields('Set-Cookie');
        if isempty(cookieFields)
            return
        end
        cookieData = cookieFields.convert(); % get array of Set-Cookie structs
        cookies = [cookieData.Cookie]; % get array of Cookies from all structs
        try
            % If info for this host was already in the map, add its cookies to it.
            ainfo = infos(ahost);
            ainfo.cookies = [ainfo.cookies cookies];
            infos(char(ahost)) = ainfo;
        catch
            % Not yet in map, so add new info struct.
            infos(char(ahost)) = struct('cookies',cookies,'uri',[]);
        end
    end
end