Related
I have some big size PDF catalogs at my website, and I need to link these as download. When I googled, I found such a thing noted below. It should open the "Save As..." popup at link click...
<head>
<meta name="content-disposition" content="inline; filename=filename.pdf">
...
But it doesn't work :/ When I link to a file as below, it just links to file and is trying to open the file.
File name
UPDATE (according to answers below):
As I see there is no 100% reliable cross-browser solution for this. Probably the best way is using one of the web services listed below, and giving a download link...
http://box.net/
http://droplr.com/
http://getcloudapp.com/
From an answer to Force a browser to save file as after clicking link:
<a href="path/to/file" download>Click here to download</a>
Use the download attribute, but take into account that it only works for files hosted in the same origin that your code. It means that users can only download files that are from the origin site, same host.
Download with original filename:
Click here to download
Download with 'some_name' as filename:
Click here to download
Adding target="_blank" we will use a new Tab instead of the actual one, and also it will contribute to the proper behavior of the download attribute in some scenarios.
It follows the same rules as same-origin policy. You can learn more about this policy on the MDN Web Doc same-origin policy page
You can lern more about this download HTML5 attribute on the MDN Web Doc anchor's attributes page.
Meta tags are not a reliable way to achieve this result. Generally you shouldn't even do this - it should be left up to the user/user agent to decide what do to with the content you provide. The user can always force their browser to download the file if they wish to.
If you still want to force the browser to download the file, modify the HTTP headers directly. Here's a PHP code example:
$path = "path/to/file.pdf";
$filename = "file.pdf";
header('Content-Transfer-Encoding: binary'); // For Gecko browsers mainly
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($path)) . ' GMT');
header('Accept-Ranges: bytes'); // Allow support for download resume
header('Content-Length: ' . filesize($path)); // File size
header('Content-Encoding: none');
header('Content-Type: application/pdf'); // Change the mime type if the file is not PDF
header('Content-Disposition: attachment; filename=' . $filename); // Make the browser display the Save As dialog
readfile($path); // This is necessary in order to get it to actually download the file, otherwise it will be 0Kb
Note that this is just an extension to the HTTP protocol; some browsers might ignore it anyway.
I had this same issue and found a solution that has worked great so far. You put the following code in your .htaccess file:
<FilesMatch "\.(?i:pdf)$">
ForceType application/octet-stream
Header set Content-Disposition attachment
</FilesMatch>
It came from Force a File to Download Instead of Showing Up in the Browser.
I found a very simple solution for Firefox (only works with a relative rather than a direct href): add type="application/octet-stream":
Example
Generally it happens, because some browsers settings or plug-ins directly open PDF in the same window like a simple web page.
The following might help you. I have done it in PHP a few years back. But currently I'm not working on that platform.
<?php
if (isset($_GET['file'])) {
$file = $_GET['file'];
if (file_exists($file) && is_readable($file) && preg_match('/\.pdf$/',$file)) {
header('Content-type: application/pdf');
header("Content-Disposition: attachment; filename=\"$file\"");
readfile($file);
}
}
else {
header("HTTP/1.0 404 Not Found");
echo "<h1>Error 404: File Not Found: <br /><em>$file</em></h1>";
}
?>
Save the above as download.php.
Save this little snippet as a PHP file somewhere on your server and you can use it to make a file download in the browser, rather than display directly. If you want to serve files other than PDF, remove or edit line 5.
You can use it like so:
Add the following link to your HTML file.
Download the cool PDF.
Reference from: This blog
Try adding this line to your .htaccess file.
AddType application/octet-stream .pdf
I hope it'll work as it is browser independent.
I just used this, but I don't know if it works across all browsers.
It works in Firefox:
<a href="myfile.pdf" download>Click to Download</a>
A really simple way to achieve this, without using external download sites or modifying headers etc. is to simply create a ZIP file with the PDF inside and link directly to the ZIP file. This will ALWAYS trigger the Save/Open dialog, and it's still easy for people to double-click the PDF windows the program associated with .zip is launched.
BTW great question, I was looking for an answer as well, since most browser-embedded PDF plugins take sooo long to display anything (and will often hang the browser whilst the PDF is loading).
Just put the below code in your .htaccess file:
AddType application/octet-stream .csv
AddType application/octet-stream .xls
AddType application/octet-stream .doc
AddType application/octet-stream .avi
AddType application/octet-stream .mpg
AddType application/octet-stream .mov
AddType application/octet-stream .pdf
Or you can also do trick by JavaScript
element.setAttribute( 'download', whatever_string_you_want);
A very easy way to do this, if you need to force download for a single link on your page, is to use the HTML5 download-attribute in the href-link.
See: http://davidwalsh.name/download-attribute
with this you can rename the file that the user will download and at the same time it forces the download.
There has been a debate whether this is good practice or not, but in my case I have an embedded viewer for a PDF file and the viewer does not offer a download link, so i have to provide one separately. Here I want to make sure the user does not get the PDF opened in the web browser, which would be confusing.
This won't necessary open the save as-dialog, but will download the link straight to the preset download destination. And of course if you are doing a site for someone else, and need them to write in manually attributes to their links is probably a bad idea, but if there is way to get the attribute into the links, this can be a light solution.
A server-side solution is more compatible, until the "download" attribute is implemented in all the browsers.
One Python example could be a custom HTTP request handler for a filestore. The links that point to the filestore are generated like this:
http://www.myfilestore.com/filestore/13/130787e71/download_as/desiredName.pdf
Here is the code:
class HTTPFilestoreHandler(SimpleHTTPRequestHandler):
def __init__(self, fs_path, *args):
self.fs_path = fs_path # Filestore path
SimpleHTTPRequestHandler.__init__(self, *args)
def send_head(self):
# Overwrite SimpleHTTPRequestHandler.send_head to force download name
path = self.path
get_index = (path == '/')
self.log_message("path: %s" % path)
if '/download_as/' in path:
p_parts = path.split('/download_as/')
assert len(p_parts) == 2, 'Bad download link:' + path
path, download_as = p_parts
path = self.translate_path(path )
f = None
if os.path.isdir(path):
if not self.path.endswith('/'):
# Redirect browser - doing basically what Apache does
self.send_response(301)
self.send_header("Location", self.path + "/")
self.end_headers()
return None
else:
return self.list_directory(path)
ctype = self.guess_type(path)
try:
f = open(path, 'rb')
except IOError:
self.send_error(404, "File not found")
return None
self.send_response(200)
self.send_header("Content-type", ctype)
fs = os.fstat(f.fileno())
self.send_header("Expires", '0')
self.send_header("Last-Modified", self.date_time_string(fs.st_mtime))
self.send_header("Cache-Control", 'must-revalidate, post-check=0, pre-check=0')
self.send_header("Content-Transfer-Encoding", 'binary')
if download_as:
self.send_header("Content-Disposition", 'attachment; filename="%s"' % download_as)
self.send_header("Content-Length", str(fs[6]))
self.send_header("Connection", 'close')
self.end_headers()
return f
class HTTPFilestoreServer:
def __init__(self, fs_path, server_address):
def handler(*args):
newHandler = HTTPFilestoreHandler(fs_path, *args)
newHandler.protocol_version = "HTTP/1.0"
self.server = BaseHTTPServer.HTTPServer(server_address, handler)
def serve_forever(self, *args):
self.server.serve_forever(*args)
def start_server(fs_path, ip_address, port):
server_address = (ip_address, port)
httpd = HTTPFilestoreServer(fs_path, server_address)
sa = httpd.server.socket.getsockname()
print "Serving HTTP on", sa[0], "port", sa[1], "..."
httpd.serve_forever()
This is old post but here is the one my solution in JavaScript what using jQuery library.
<script>
(function($){
var download = [];
$('a.force-download, .force-download a').each(function(){
// Collect info
var $this = $(this),
$href = $this.attr('href'),
$split = $href.split('/'),
$name = document.title.replace(/[\W_]/gi, '-').replace(/-{2,}/g, '-'); // get title and clean it for the URL
// Get filename from URL
if($split[($split.length-1)])
{
$tmp = $split[($split.length-1)];
$tmp = $tmp.split('.');
$name = $tmp[0].replace(/[\W_]/gi, '-').replace(/-{2,}/g, '-');
}
// If name already exists, put timestamp there
if($.inArray($name, download) > -1)
{
$name = $name + '-' + Date.now().replace(/[\W]/gi, '-');
}
$(this).attr("download", $name);
download.push($name);
});
}(jQuery || window.jQuery))
</script>
You just need to use class force-download inside your <a> tag and will force download automaticaly. You also can add it to parent div and will pickup all links inside it.
Example:
Download PDF
This is great for WordPress and any other systems or custom websites.
Add a response header Content-Disposition:attachment; followed by the file name. Remove the Meta Content-Disposition;Inline; which will open the document in the same window
In java it is set as
response.setHeader("Content-Disposition", "attachment;filename=test.jpg");
After the file name in the HTML code I add ?forcedownload=1
This has been the simplest way for me to trigger a dialog box to save or download.
If you have a plugin within the browser which knows how to open a PDF file it will open directly. Like in case of images and HTML content.
So the alternative approach is not to send your MIME type in the response. In this way the browser will never know which plugin should open it. Hence it will give you a Save/Open dialog box.
I just had a very similar issue with the added problem that I needed to create download links to files inside a ZIP file.
I first tried to create a temporary file, then provided a link to the temporary file, but I found that some browsers would just display the contents (a CSV Excel file) rather than offering to download. Eventually I found the solution by using a servlet. It works both on Tomcat and GlassFish, and I tried it on Internet Explorer 10 and Chrome.
The servlet takes as input a full path name to the ZIP file, and the name of the file inside the zip that should be downloaded.
Inside my JSP file I have a table displaying all the files inside the zip, with links that say: onclick='download?zip=<%=zip%>&csv=<%=csv%>'
The servlet code is in download.java:
package myServlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.zip.*;
import java.util.*;
// Extend HttpServlet class
public class download extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out = response.getWriter(); // now we can write to the client
String filename = request.getParameter("csv");
String zipfile = request.getParameter("zip");
String aLine = "";
response.setContentType("application/x-download");
response.setHeader( "Content-Disposition", "attachment; filename=" + filename); // Force 'save-as'
ZipFile zip = new ZipFile(zipfile);
for (Enumeration e = zip.entries(); e.hasMoreElements();) {
ZipEntry entry = (ZipEntry) e.nextElement();
if(entry.toString().equals(filename)) {
InputStream is = zip.getInputStream(entry);
BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"), 65536);
while ((aLine = br.readLine()) != null) {
out.println(aLine);
}
is.close();
break;
}
}
}
}
To compile on Tomcat you need the classpath to include tomcat\lib\servlet-api.jar or on GlassFish: glassfish\lib\j2ee.jar
But either one will work on both. You also need to set your servlet in web.xml.
Chrome 91 had a new change, it supported in chrome 86-90 and 91+.
The following syntax will make it happen.
const fileHandle = await self.showSaveFilePicker({
suggestedName: 'Untitled Text.txt',
types: [{
description: 'Text documents',
accept: {
'text/plain': ['.txt'],
},
}],
});
Read more here:
https://developer.chrome.com/blog/new-in-chrome-91/
**Another solution you can just make it as a blob and then use saveAs **
const blob = fetch("some-url-here").then(data => data.blob());
saveAs(blob, "filename.txt")
With large PDF files the browser hangs.
In Mozilla, menu Tools → Options → Applications, then next to the content type Adobe Acrobat document.
In the Action drop down, select Always ask.
This did not work for me, so what worked was:
Menu Tools* → Add-ons → Adobe Acrobat (Adobe PDF plugin for Firefox) → DISABLE.
Now I am able to download e-books!
I have a HTML file which contains local resource files such as css, js and png files inside its content. These local resource files are in zip format. My app use WKWebView to display this html file. I want to find a solution to intercept the web view request to detect which local resource files are load together with this html file -> then unzip them if they are still zip format.
My HTML data content contains thousands of these local resource file so I can't unzip all of them before display content. With UIWebView, we are using NSURLProtocol subclass to intercept the request, detect local resource files and un-zip it on demand based on the html page which user is viewing.
I am having this issue when convert UIWebView to WKWebView.
Similar problem was post here: https://forums.developer.apple.com/thread/87474
======= Update =======>
I figured it out by using WKURLSchemeHandler.
Note: You need to change the file scheme to a custom scheme in order to use WKURLSchemeHandler because it will not work with standard
schemes like file, http, https.
1. Register custom scheme with WKWebView
let configuration = WKWebViewConfiguration()
configuration.setURLSchemeHandler(self, forURLScheme: "x-file")
webView = WKWebView(frame: view.bounds, configuration: configuration)
2. Convert file scheme to the custom scheme (x-file) then load it with WKWebView
let htmlPath = Bundle.main.path(forResource: "index", ofType: "html")
var htmlURL = URL(fileURLWithPath: htmlPath!, isDirectory: false)
htmlURL = self.changeURLScheme(newScheme: "x-file", forURL: htmlURL)
self.webView.load(URLRequest(url: htmlURL))
3. Implement 2 methods of WKURLSchemeHandler protocol and handle 3 delegate methods of WKURLSchemeTask.
func webView(_ webView: WKWebView, start urlSchemeTask: WKURLSchemeTask) {
print("Function: \(#function), line: \(#line)")
print("==> \(urlSchemeTask.request.url?.absoluteString ?? "")\n")
// Your local resource files will be catch here. You can determine it by checking the urlSchemeTask.request.url.
// From here I will unzip local resource files (js, css, png,...) if they are still in zip format
....
// Handle WKURLSchemeTask delegate methods
let url = changeURLScheme(newScheme: "file", forURL: urlSchemeTask.request.url!)
do {
let data = try Data(contentsOf: url)
urlSchemeTask.didReceive(URLResponse(url: urlSchemeTask.request.url!, mimeType: "text/html", expectedContentLength: data.count, textEncodingName: nil))
urlSchemeTask.didReceive(data)
urlSchemeTask.didFinish()
} catch {
print("Unexpected error when get data from URL: \(url)")
}
}
func webView(_ webView: WKWebView, stop urlSchemeTask: WKURLSchemeTask) {
print("Function: \(#function), line: \(#line)")
print("==> \(urlSchemeTask.request.url?.absoluteString ?? "")\n")
}
If WKWebView loads a local html file you could just give the WKWebView access to local app resources like so:
NSURL *documentDirectoryURL = [NSURL fileURLWithPath:DOCUMENTS_DIRECTORY];
// This code gives acces to a file that is outside of our webview html file root directory
[self.webView loadFileURL:documentDirectoryURL allowingReadAccessToURL:documentDirectoryURL];
// If you use one of these loads after, they will too have access if they are in app html files
[self.webView loadRequest:<inAppHTMLFile>];
[self.webView loadHTMLString: baseURL:];
This here gives access to all files in the document directory.
I found your solution helpful when I wanted to link local resources to online pages.
WKUserContentController *contentController = [[WKUserContentController alloc]init];
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc]init];
CustomFileShemeHandler *schemeHandler = [[CustomFileShemeHandler alloc] init];
[config setURLSchemeHandler:schemeHandler forURLScheme:#"myApp-images"];
config.userContentController = contentController;
self.webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
//CustomFileShemeHandler.m
#implementation CustomFileShemeHandler
- (void)webView:(nonnull WKWebView *)webView startURLSchemeTask:(nonnull id<WKURLSchemeTask>)urlSchemeTask {
NSURL *customFileURL = urlSchemeTask.request.URL;
NSString *securityFilter = [NSString stringWithFormat:#"Documents/LocalAppImages"];
if (![customFileURL.absoluteString containsString:securityFilter]) {
return;
}
NSURL *fileURL = [self changeURLScheme:customFileURL toScheme:#"file"];
NSURLRequest* fileUrlRequest = [[NSURLRequest alloc] initWithURL:fileURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:.1];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:fileUrlRequest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSURLResponse *response2 = [[NSURLResponse alloc] initWithURL:urlSchemeTask.request.URL MIMEType:response.MIMEType expectedContentLength:data.length textEncodingName:nil];
if(error){
[urlSchemeTask didFailWithError:error];
}
[urlSchemeTask didReceiveResponse:response2];
[urlSchemeTask didReceiveData:data];
[urlSchemeTask didFinish];
}];
[dataTask resume];
}
- (void)webView:(nonnull WKWebView *)webView stopURLSchemeTask:(nonnull id<WKURLSchemeTask>)urlSchemeTask {
NSLog(#"DUNNO WHAT TO DO HERE");
}
- (NSURL *)changeURLScheme:(NSURL *)url toScheme:(NSString *)newScheme {
NSURLComponents *components = [NSURLComponents componentsWithURL:url resolvingAgainstBaseURL:YES];
components.scheme = newScheme;
return components.URL;
}
With this any page open in the webView can link to a local resource using its full path an the custom scheme:
<img src="myApp-images:///<YourDocumentsAppPahtHere>/LocalAppImages/funnyDog.jpg">
Following the answer of h3dkandi this comment helped me solve my problem: (updated code in swift)
If you first use:
// use this in order to access images, css files etc..
webView.loadFileURL(baseURL, allowingReadAccessTo: baseURL)
// use this method to actually load the html with images, css etc..
webView.loadHTMLString(htmlString, baseURL: baseURL)
Where baseURL is the path that my local .html file exists.
I have some big size PDF catalogs at my website, and I need to link these as download. When I googled, I found such a thing noted below. It should open the "Save As..." popup at link click...
<head>
<meta name="content-disposition" content="inline; filename=filename.pdf">
...
But it doesn't work :/ When I link to a file as below, it just links to file and is trying to open the file.
File name
UPDATE (according to answers below):
As I see there is no 100% reliable cross-browser solution for this. Probably the best way is using one of the web services listed below, and giving a download link...
http://box.net/
http://droplr.com/
http://getcloudapp.com/
From an answer to Force a browser to save file as after clicking link:
<a href="path/to/file" download>Click here to download</a>
Use the download attribute, but take into account that it only works for files hosted in the same origin that your code. It means that users can only download files that are from the origin site, same host.
Download with original filename:
Click here to download
Download with 'some_name' as filename:
Click here to download
Adding target="_blank" we will use a new Tab instead of the actual one, and also it will contribute to the proper behavior of the download attribute in some scenarios.
It follows the same rules as same-origin policy. You can learn more about this policy on the MDN Web Doc same-origin policy page
You can lern more about this download HTML5 attribute on the MDN Web Doc anchor's attributes page.
Meta tags are not a reliable way to achieve this result. Generally you shouldn't even do this - it should be left up to the user/user agent to decide what do to with the content you provide. The user can always force their browser to download the file if they wish to.
If you still want to force the browser to download the file, modify the HTTP headers directly. Here's a PHP code example:
$path = "path/to/file.pdf";
$filename = "file.pdf";
header('Content-Transfer-Encoding: binary'); // For Gecko browsers mainly
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($path)) . ' GMT');
header('Accept-Ranges: bytes'); // Allow support for download resume
header('Content-Length: ' . filesize($path)); // File size
header('Content-Encoding: none');
header('Content-Type: application/pdf'); // Change the mime type if the file is not PDF
header('Content-Disposition: attachment; filename=' . $filename); // Make the browser display the Save As dialog
readfile($path); // This is necessary in order to get it to actually download the file, otherwise it will be 0Kb
Note that this is just an extension to the HTTP protocol; some browsers might ignore it anyway.
I had this same issue and found a solution that has worked great so far. You put the following code in your .htaccess file:
<FilesMatch "\.(?i:pdf)$">
ForceType application/octet-stream
Header set Content-Disposition attachment
</FilesMatch>
It came from Force a File to Download Instead of Showing Up in the Browser.
I found a very simple solution for Firefox (only works with a relative rather than a direct href): add type="application/octet-stream":
Example
Generally it happens, because some browsers settings or plug-ins directly open PDF in the same window like a simple web page.
The following might help you. I have done it in PHP a few years back. But currently I'm not working on that platform.
<?php
if (isset($_GET['file'])) {
$file = $_GET['file'];
if (file_exists($file) && is_readable($file) && preg_match('/\.pdf$/',$file)) {
header('Content-type: application/pdf');
header("Content-Disposition: attachment; filename=\"$file\"");
readfile($file);
}
}
else {
header("HTTP/1.0 404 Not Found");
echo "<h1>Error 404: File Not Found: <br /><em>$file</em></h1>";
}
?>
Save the above as download.php.
Save this little snippet as a PHP file somewhere on your server and you can use it to make a file download in the browser, rather than display directly. If you want to serve files other than PDF, remove or edit line 5.
You can use it like so:
Add the following link to your HTML file.
Download the cool PDF.
Reference from: This blog
Try adding this line to your .htaccess file.
AddType application/octet-stream .pdf
I hope it'll work as it is browser independent.
I just used this, but I don't know if it works across all browsers.
It works in Firefox:
<a href="myfile.pdf" download>Click to Download</a>
A really simple way to achieve this, without using external download sites or modifying headers etc. is to simply create a ZIP file with the PDF inside and link directly to the ZIP file. This will ALWAYS trigger the Save/Open dialog, and it's still easy for people to double-click the PDF windows the program associated with .zip is launched.
BTW great question, I was looking for an answer as well, since most browser-embedded PDF plugins take sooo long to display anything (and will often hang the browser whilst the PDF is loading).
Just put the below code in your .htaccess file:
AddType application/octet-stream .csv
AddType application/octet-stream .xls
AddType application/octet-stream .doc
AddType application/octet-stream .avi
AddType application/octet-stream .mpg
AddType application/octet-stream .mov
AddType application/octet-stream .pdf
Or you can also do trick by JavaScript
element.setAttribute( 'download', whatever_string_you_want);
A very easy way to do this, if you need to force download for a single link on your page, is to use the HTML5 download-attribute in the href-link.
See: http://davidwalsh.name/download-attribute
with this you can rename the file that the user will download and at the same time it forces the download.
There has been a debate whether this is good practice or not, but in my case I have an embedded viewer for a PDF file and the viewer does not offer a download link, so i have to provide one separately. Here I want to make sure the user does not get the PDF opened in the web browser, which would be confusing.
This won't necessary open the save as-dialog, but will download the link straight to the preset download destination. And of course if you are doing a site for someone else, and need them to write in manually attributes to their links is probably a bad idea, but if there is way to get the attribute into the links, this can be a light solution.
A server-side solution is more compatible, until the "download" attribute is implemented in all the browsers.
One Python example could be a custom HTTP request handler for a filestore. The links that point to the filestore are generated like this:
http://www.myfilestore.com/filestore/13/130787e71/download_as/desiredName.pdf
Here is the code:
class HTTPFilestoreHandler(SimpleHTTPRequestHandler):
def __init__(self, fs_path, *args):
self.fs_path = fs_path # Filestore path
SimpleHTTPRequestHandler.__init__(self, *args)
def send_head(self):
# Overwrite SimpleHTTPRequestHandler.send_head to force download name
path = self.path
get_index = (path == '/')
self.log_message("path: %s" % path)
if '/download_as/' in path:
p_parts = path.split('/download_as/')
assert len(p_parts) == 2, 'Bad download link:' + path
path, download_as = p_parts
path = self.translate_path(path )
f = None
if os.path.isdir(path):
if not self.path.endswith('/'):
# Redirect browser - doing basically what Apache does
self.send_response(301)
self.send_header("Location", self.path + "/")
self.end_headers()
return None
else:
return self.list_directory(path)
ctype = self.guess_type(path)
try:
f = open(path, 'rb')
except IOError:
self.send_error(404, "File not found")
return None
self.send_response(200)
self.send_header("Content-type", ctype)
fs = os.fstat(f.fileno())
self.send_header("Expires", '0')
self.send_header("Last-Modified", self.date_time_string(fs.st_mtime))
self.send_header("Cache-Control", 'must-revalidate, post-check=0, pre-check=0')
self.send_header("Content-Transfer-Encoding", 'binary')
if download_as:
self.send_header("Content-Disposition", 'attachment; filename="%s"' % download_as)
self.send_header("Content-Length", str(fs[6]))
self.send_header("Connection", 'close')
self.end_headers()
return f
class HTTPFilestoreServer:
def __init__(self, fs_path, server_address):
def handler(*args):
newHandler = HTTPFilestoreHandler(fs_path, *args)
newHandler.protocol_version = "HTTP/1.0"
self.server = BaseHTTPServer.HTTPServer(server_address, handler)
def serve_forever(self, *args):
self.server.serve_forever(*args)
def start_server(fs_path, ip_address, port):
server_address = (ip_address, port)
httpd = HTTPFilestoreServer(fs_path, server_address)
sa = httpd.server.socket.getsockname()
print "Serving HTTP on", sa[0], "port", sa[1], "..."
httpd.serve_forever()
This is old post but here is the one my solution in JavaScript what using jQuery library.
<script>
(function($){
var download = [];
$('a.force-download, .force-download a').each(function(){
// Collect info
var $this = $(this),
$href = $this.attr('href'),
$split = $href.split('/'),
$name = document.title.replace(/[\W_]/gi, '-').replace(/-{2,}/g, '-'); // get title and clean it for the URL
// Get filename from URL
if($split[($split.length-1)])
{
$tmp = $split[($split.length-1)];
$tmp = $tmp.split('.');
$name = $tmp[0].replace(/[\W_]/gi, '-').replace(/-{2,}/g, '-');
}
// If name already exists, put timestamp there
if($.inArray($name, download) > -1)
{
$name = $name + '-' + Date.now().replace(/[\W]/gi, '-');
}
$(this).attr("download", $name);
download.push($name);
});
}(jQuery || window.jQuery))
</script>
You just need to use class force-download inside your <a> tag and will force download automaticaly. You also can add it to parent div and will pickup all links inside it.
Example:
Download PDF
This is great for WordPress and any other systems or custom websites.
Add a response header Content-Disposition:attachment; followed by the file name. Remove the Meta Content-Disposition;Inline; which will open the document in the same window
In java it is set as
response.setHeader("Content-Disposition", "attachment;filename=test.jpg");
After the file name in the HTML code I add ?forcedownload=1
This has been the simplest way for me to trigger a dialog box to save or download.
If you have a plugin within the browser which knows how to open a PDF file it will open directly. Like in case of images and HTML content.
So the alternative approach is not to send your MIME type in the response. In this way the browser will never know which plugin should open it. Hence it will give you a Save/Open dialog box.
I just had a very similar issue with the added problem that I needed to create download links to files inside a ZIP file.
I first tried to create a temporary file, then provided a link to the temporary file, but I found that some browsers would just display the contents (a CSV Excel file) rather than offering to download. Eventually I found the solution by using a servlet. It works both on Tomcat and GlassFish, and I tried it on Internet Explorer 10 and Chrome.
The servlet takes as input a full path name to the ZIP file, and the name of the file inside the zip that should be downloaded.
Inside my JSP file I have a table displaying all the files inside the zip, with links that say: onclick='download?zip=<%=zip%>&csv=<%=csv%>'
The servlet code is in download.java:
package myServlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.zip.*;
import java.util.*;
// Extend HttpServlet class
public class download extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out = response.getWriter(); // now we can write to the client
String filename = request.getParameter("csv");
String zipfile = request.getParameter("zip");
String aLine = "";
response.setContentType("application/x-download");
response.setHeader( "Content-Disposition", "attachment; filename=" + filename); // Force 'save-as'
ZipFile zip = new ZipFile(zipfile);
for (Enumeration e = zip.entries(); e.hasMoreElements();) {
ZipEntry entry = (ZipEntry) e.nextElement();
if(entry.toString().equals(filename)) {
InputStream is = zip.getInputStream(entry);
BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"), 65536);
while ((aLine = br.readLine()) != null) {
out.println(aLine);
}
is.close();
break;
}
}
}
}
To compile on Tomcat you need the classpath to include tomcat\lib\servlet-api.jar or on GlassFish: glassfish\lib\j2ee.jar
But either one will work on both. You also need to set your servlet in web.xml.
Chrome 91 had a new change, it supported in chrome 86-90 and 91+.
The following syntax will make it happen.
const fileHandle = await self.showSaveFilePicker({
suggestedName: 'Untitled Text.txt',
types: [{
description: 'Text documents',
accept: {
'text/plain': ['.txt'],
},
}],
});
Read more here:
https://developer.chrome.com/blog/new-in-chrome-91/
**Another solution you can just make it as a blob and then use saveAs **
const blob = fetch("some-url-here").then(data => data.blob());
saveAs(blob, "filename.txt")
With large PDF files the browser hangs.
In Mozilla, menu Tools → Options → Applications, then next to the content type Adobe Acrobat document.
In the Action drop down, select Always ask.
This did not work for me, so what worked was:
Menu Tools* → Add-ons → Adobe Acrobat (Adobe PDF plugin for Firefox) → DISABLE.
Now I am able to download e-books!
I have a wicket application in which I have added the javascript files within the markup html:
<script src="script/jquery.min.js" type="text/javascript"></script>
My javascript files are not placed beside my .java or .html files, they are in different location in the server as can be seen on previous script declaration.
My question is: Is it possible to add these javascript files depending on the application mode? I.E. if the application is in development mode, load one javascript file, if it is in production load this other one.
Thanks!
PS: the idea is to load "min" version on production but the extended files on development so debugging becomes posible
NOTE: Watching different answers here I re-state: the problem is not finding when the wicket app is in development or deployment mode, I know that, but is about how to change html markup or adding different JavaScript resources
extendig the answer of #rotsch you can do it in wicket 1.5 with :
#Override
public void renderHead(IHeaderResponse response) {
if(DEVELOPMENT)
response.renderString("<script type=\"text/javascript\" src=\"url1\"></script>");
else
response.renderString("<script type=\"text/javascript\" src=\"url2\"></script>");
}
https://cwiki.apache.org/WICKET/migration-to-wicket-15.html#MigrationtoWicket1.5-RemovedHeaderContributorandfriends.
You can find out in which mode you are with the following code:
RuntimeConfigurationType.DEPLOYMENT.equals(getApplication().getConfigurationType())
or
RuntimeConfigurationType.DEVELOPMENT.equals(getApplication().getConfigurationType())
I use this directory layout:
resources
|---JQueryResource.java
|---jquery-1.6.4.js
|---jquery-1.6.4.min.js
With this class:
public class JQueryResource {
/**
* Must be called in a RequestCycle.
*
* #return Url for the jQuery library.
*/
public static String getURL() {
if (Application.get().usesDevelopmentConfig()) {
Url url =
RequestCycle.get().mapUrlFor(
new PackageResourceReference(JQueryResource.class, "jquery-1.6.4.js"),
null);
return url.toString();
} else {
Url url =
RequestCycle.get().mapUrlFor(
new PackageResourceReference(JQueryResource.class,
"jquery-1.6.4.min.js"), null);
return url.toString();
}
}
}
This is how I add the resource to my page.
#Override
public void renderHead(IHeaderResponse a_response) {
a_response.renderJavaScriptReference(JQueryResource.getURL());
}
You could use pack:tag to compress all your resources: http://sourceforge.net/projects/packtag/
In your web.xml/.properties file you can specify whether to pack it or not depending on your production mode.
I set a property in a properties file with I add to the path when starting the VM.
Then I do a if else similar to the PHP answer.
My company has a very strict intranet for work related, the net has a single doorway to allow files in and out. The doorway's security does not allow special kinds of files (*.txt, *.doc etc only), and even in those specific kinds of files, it searches for patterns that approve that the file is really that kind. (You can't simply disguise a *.zip file as a *.doc file.)
As a security project, I was told to find a way to bypass this system, and insert a single C language .exe file that says 'Hello World'.
What I thought was to change the extension to .txt, and base64 encode it so that it would be more acceptable for the system. The problem is, how to decode it once it's in. It's very easy on the outside, PHP or any other decent language can do it for me. However, in there, the only real language I have access to is JavaScript (on IE6 and maybe, MAYBE, on IE8).
So the question is as follows, can I use JavaScript to read a file from the file system, decode it, and write it back? or at least display the result for me?
Note that I don't ask for decoding/encoding a message, this one is easy, I look to decode encode a file.
JSON might be the answer you are looking for. It can actually do the trick.
Encode your txt file in JSON format. It is very likely for it to pass your company's doorway security
var myJsonData = { "text" : "SGVsbG8sIHdvcmxkIQ==" }; // <-- base64 for "Hello, world!"
Import your txt file using plain html script syntax
<script src="hello.txt" type="text/javascript"> </script>
That's it! Now you can access a JSON object using the Syntax:
alert(myJsonData.text);
To complete your job, get this simple Javascript base64 decoder.
You're done. Here's the (very simple) code I've used:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1250">
<meta name="generator" content="PSPad editor, www.pspad.com">
<title></title>
<script src="base64utils.js" type="text/javascript"> </script>
<script src="hello.txt" type="text/javascript"> </script>
<script type="text/javascript">
function helloFunction() {
document.getElementById("hello").innerHTML = decode64(myJsonData.text);
}
</script>
</head>
<body onload="helloFunction();">
<p id="hello"></p>
</body>
</html>
Using only javascript (i.e. no plugins like AIR etc), browsers don't allow access to the file system. Not only is it not possible to write a file to the disk, it's not possible to even read it - browsers are very strict on that sort of thing, thank goodness.
You cannot do this with straight JS in the browser, security context and the DOM do not allow filesystem access.
You cannot do this with current versions of flash, older versions (pre 7 IIRC) had some security flaws that allowed filesystem access.
You could do this with a custom plugin, and possibly a signed Java applet, or COM (ActiveX component, IE only).
I would suggest working with IT regarding your intranet to open up the context/permissions needed in this case as that may be the shortest path to what you are wanting here. Alternative, you could create a command-line utility to easily encrypt/decrypt given files signed by a common key.
It all depends on how you can get the file in. If you have the base-64 encoded exe as a .txt, you could easily use Flash!
I'm not quite sure how you would implement this, but you can load a file into flash and as3 using flex.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import flash.net.FileReference;
import flash.net.FileFilter;
import flash.events.IOErrorEvent;
import flash.events.Event;
import flash.utils.ByteArray;
//FileReference Class well will use to load data
private var fr:FileReference;
//File types which we want the user to open
private static const FILE_TYPES:Array = [new FileFilter("Text File", "*.txt;*.text")];
//called when the user clicks the load file button
private function onLoadFileClick():void
{
//create the FileReference instance
fr = new FileReference();
//listen for when they select a file
fr.addEventListener(Event.SELECT, onFileSelect);
//listen for when then cancel out of the browse dialog
fr.addEventListener(Event.CANCEL,onCancel);
//open a native browse dialog that filters for text files
fr.browse(FILE_TYPES);
}
/************ Browse Event Handlers **************/
//called when the user selects a file from the browse dialog
private function onFileSelect(e:Event):void
{
//listen for when the file has loaded
fr.addEventListener(Event.COMPLETE, onLoadComplete);
//listen for any errors reading the file
fr.addEventListener(IOErrorEvent.IO_ERROR, onLoadError);
//load the content of the file
fr.load();
}
//called when the user cancels out of the browser dialog
private function onCancel(e:Event):void
{
trace("File Browse Canceled");
fr = null;
}
/************ Select Event Handlers **************/
//called when the file has completed loading
private function onLoadComplete(e:Event):void
{
//get the data from the file as a ByteArray
var data:ByteArray = fr.data;
//read the bytes of the file as a string and put it in the
//textarea
outputField.text = data.readUTFBytes(data.bytesAvailable);
//clean up the FileReference instance
fr = null;
}
//called if an error occurs while loading the file contents
private function onLoadError(e:IOErrorEvent):void
{
trace("Error loading file : " + e.text);
}
]]>
</mx:Script>
<mx:Button label="Load Text File" right="10" bottom="10" click="onLoadFileClick()"/>
<mx:TextArea right="10" left="10" top="10" bottom="40" id="outputField"/>
</mx:Application>
To decode it, look into http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/utils/Base64Decoder.html
If the security system scans for patterns in files, it is very unlikely that it will overlook a base64-encoded file or base64-encoded contents in files. E-mail attachments are base64-encoded, and if the system is any good it will scan for potentially harmful e-mail attachments even if they are named .txt. The base64-encoded start of an EXE file is almost certainly recognized by it. So ISTM you are asking the wrong question.