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javascript sanitize string for filename

Sanitize a string to be safe for use as a filename by removing directory paths and invalid characters. The resulting string is truncated to bytes in length. The string will not contain any directory paths and will be safe to use as a filename. FAT 8. The test program will use various strings including the Big List of Naughty Strings to create files in the working directory.

Run npm test to run tests against your file system. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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sanitize HTML with jQuery prevent Application from XSS attacks

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Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I'm in the unfortunate position to where I have to create files and folders programmatically that have to work with a legacy system. In this process, the file and folder names have to be heavily sanitized. The POST requests that create the files and folders are sent from the client in javascript, while the actual creation happens on a server.

For this, I wrote a function used to display to users what their input folder or file names will look like and to sanitize their input to work with the legacy system. I've let this run over quite a few test cases including irregular file names that broke the legacy system prior and it seems to work fine.

javascript sanitize string for filename

I'm curious about what could be improved though, especially with respect to readability and extensibility. If you use ES5 with Decorators you can todo general determination Errors, and add for instance, function-condition in this Decorator. Addressing most of the points above the rewrite only returns a string mode now called type is "file" or it defaults as "folder". Converts the extension to lowercase. Use RegExp literals rather than create them via instantiation.

Use arrays to hold replacement arguments so that the spread operator can be used to call replace. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Sanitize file or folder names to work with a legacy system Ask Question.

Asked 1 year, 3 months ago. Active 1 year, 3 months ago. Viewed times. Magisch Magisch 2 2 silver badges 14 14 bronze badges. Active Oldest Votes. Kostiantyn Okhotnyk Kostiantyn Okhotnyk 1 1 silver badge 6 6 bronze badges.

Similar existing functions in our env use numbers like 1 for "file" and 2 for "folder" for modes, for instance. You are comparing Something with Constant. Use functions to reduce repetition. Use the shortest or simplest form. Eg you define RegExp as strings and then create them when needed. Don't duplicate code. You test for mode not equal to "file" and "folder" then you test for mode equal to "file" then "folder" where a final else clause will do the first test without extra overhead.

However I would wonder why the function is called with an unknown mode?GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Well, here's one that replaces anything that's not a letter or a number, and makes it all lower case, like your example. Well, actually the gi at the end is just a set of options that are used when the expression is used. So basically, what the regular expression says is: "Find every letter that is not between 'a' and 'z' or between '0' and '9'".

javascript sanitize string for filename

I know the original poster asked for a simple Regular Expression, however, there is more involved in sanitizing filenames, including filename length, reserved filenames, and, of course reserved characters.

Take a look at the code in node-sanitize-filename for a more robust solution. For more flexible and robust handling of unicode characters etc, you could use the slugify in conjunction with some regex to remove unsafe URL characters. This produces nice kebab-case filenemas in your url and allows for more characters outside the a-z range. Learn more. Asked 8 years, 4 months ago. Active 1 year, 6 months ago.

Viewed 41k times. A-Sharabiani Browsers will do URL encoding of strings in addresses, modern computers have very few restrictions on file name characters.

I'd use something like " aAbc! Active Oldest Votes. Let's read it step-by-step: The [ and ] define a "character class", which is a list of single-characters. If you'd write [one]then that would match either 'o' or 'n' or 'e'.

That means it should match only characters not in the list. Finally, the list of characters is a-z Read this as "a through z and 0 through 9". It's is a short way of writing abcdefghijklmnopqrstuvwxyzGitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.

If nothing happens, download the GitHub extension for Visual Studio and try again. It is well suited for cleaning up HTML fragments such as those created by ckeditor and other rich text editors.

It is especially handy for removing unwanted CSS when copying and pasting from Word. If a tag is not permitted, the contents of the tag are still kept, except for scriptstyle and textarea tags. Relative URLs are also allowed. Ditto for src attributes.

Allowing particular urls as a src to an iframe tag by filtering hostnames is also supported. That's pretty much it.

Spring Boot: Uploading Files and Images

All of its npm dependencies are pure JavaScript. Think first: why do you want to use it in the browser? Remember, servers must never trust browsers. You can't sanitize HTML for saving on the server anywhere else but on the server. But, perhaps you'd like to display sanitized HTML immediately in the browser for preview.

Or ask the browser to do the sanitization work on every page load. You can if you want to! That will allow our default list of allowed tags and attributes through. It's a nice set, but probably not quite what you want.

How to: Strip Invalid Characters from a String

If you do not specify allowedTags or allowedAttributes our default list is applied. So if you really want an empty list, specify one. Also simple! If you set disallowedTagsMode to discard the defaultdisallowed tags are discarded. Any text content or subtags is still included, depending on whether the individual subtags are allowed. If you set disallowedTagsMode to escapethe disallowed tags are escaped rather than discarded.

Any text or subtags is handled normally. If you set disallowedTagsMode to recursiveEscapethe disallowed tags are escaped rather than discarded, and the same treatment is applied to all subtags, whether otherwise allowed or not. When configuring the attribute in allowedAttributes simply use an object with attribute name and an allowed values array. With multiple: trueseveral allowed values may appear in the same attribute, separated by spaces. Otherwise the attribute must exactly match one and only one of the allowed values.

By default the only option passed down is decodeEntities: true You can set the options to pass by using the parser option. What if you want to add or change an attribute? What if you want to transform one tag to another? No problem, it's simple! The last parameter shouldMerge is set to true by default. When truesimpleTransform will merge the current attributes with the new ones newAttributes. When falseall existing attributes are discarded.By default, the context is the current document if not specified or given as null or undefined.

If the HTML was to be used in another document such as an iframe, that frame's document could be used. If the context is not specified or given as null or undefined, a new document is used. This can potentially improve security because inline events will not execute when the HTML is parsed. Once the parsed HTML is injected into a document it does execute, but this gives tools a chance to traverse the created DOM and remove anything deemed unsafe.

This improvement does not apply to internal uses of jQuery. However, it is still possible in most environments to execute scripts indirectly, for example via the attribute.

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In my last articleI spoke about several common mistakes that show up in web applications. This example is from a site that hosts WikiLeaks material. Note that the back end code presented is not the actual code, but what we think it might be based on how the exploit works. The HTML was taken from their website. In this code, the query string parameter search is echoed back to the user without sanitization. A simple way to test for this exploit without doing anything malicious is to use a URL like this:.

This exploit would work just as well in most other programming languages as most of them also lack default input filtering. A safer way to write the above code is as follows:.

This only takes care of the default case where an input parameter is echoed back in an HTML context. However, a web page contains many different contexts and each of these contexts requires input to be validated in a different way.

The developer correctly applies input filtering, and this code was reviewed and made live. However, something small seems to have slipped through. A crafted URL demonstrates the problem:. All of the characters in name are safe and pass through the filter untouched, but the resulting HTML looks like this:. The lack of quotes turns the attribute value into an onmouseover event handler.

When the unsuspecting user mouses over the link to click on login, the onmouseover handler triggers. Quoting the value of the href attribute fixes the problem here. This is a good enough reason to quote all attribute values even though they are optional according to the HTML spec. For this particular situation though, we also need to look at context. The href attribute accepts a URL as its value, so the value passed to it needs to be urlencoded as well as quoted.

Full image from xkcd. Here is an example from a dictionary web site:.

javascript sanitize string for filename

Now by default, no browser executes code within the title tags, so the developer probably thought that it was safe to display data untreated in the title. Carefully crafted input data can escape the title tags and inject script with something like this. Other commonly overlooked pages are error pages and error messages. Does your page echo on screen the incorrect URL that was typed in? If it does, then it needs to treat that input first. A banking website recently had code similar to the following [ 2 ] they used ASP in this case :.

The developers assumed that since this URL came from the server it would be safe.