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POIDN aware tools to encode/decode human readable IRI to/from valid URI
 

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  1. POIDN aware tools to encode/decode human readable IRI to/from valid URI
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    <p>Let's assume a user enter address of some resource and we need to translate it to: </p> <pre><code>&lt;a href="valid URI here"&gt;human readable form&lt;/a&gt; </code></pre> <p>HTML4 specification refers to <a href="http://www.faqs.org/rfcs/rfc3986.html" rel="nofollow noreferrer">RFC 3986</a> which allows only ASCII alphanumeric characters and dash in host part and all non-ASCII character in other parts should be percent-encoded. That's what I want to put in href attribute to make link working properly in all browsers. IDN should be encoded with <a href="http://en.wikipedia.org/wiki/Punycode" rel="nofollow noreferrer">Punycode</a>.</p> <p>HTML5 draft refers to <a href="http://www.faqs.org/rfcs/rfc3987.html" rel="nofollow noreferrer">RFC 3987</a> which also allows percent-encoded unicode characters in host part and a large subset of unicode in both host and other parts without encoding them. User may enter address in any of these forms. To provide human readable form of it I need to decode all printable characters. Note that some parts of address might not correspond to valid UTF-8 sequences, usually when target site uses some other character encoding.</p> <p>An example of what I'd like to get:</p> <pre><code>&lt;a href="http://xn--80aswg.xn--p1ai/%D0%BF%D1%83%D1%82%D1%8C?%D0%B7%D0%B0%D0%BF%D1%80%D0%BE%D1%81"&gt; http://сайт.рф/путь?запрос&lt;/a&gt; </code></pre> <p>Are there any tools to solve these tasks? I'm especially interested in libraries for Python and JavaScript.</p> <p><strong>Update</strong>: I know there is a way to do percent and Punycode (without proper normalization, but I can live with it) encoding/decoding in Python and JavaScript. The whole task needs much more work and there are some pitfalls (some characters should be always encoded or never encoded depending on context). I wonder if there are ready to use libraries for the <em>whole</em> problem, since it seems to be quite common and modern browsers already do such conversions (try typing <code>http://%D1%81%D0%B0%D0%B9%D1%82.%D1%80%D1%84/</code> in Google Chrome and it will be replaced with <code>http://сайт.рф/</code>, but use <code>Host: xn--80aswg.xn--p1ai</code> in HTTP request).</p> <p><strong>Update2</strong>: Vinay Sajip pointed that Werkzeug has iri_to_uri and uri_to_iri functions that handles most cases correctly. I've found only 2 cases where it fails so far: percent-encoded host (quite easy to fix) and invalid utf-8 sequences (it's a bit tricky to do nicely, but shouldn't be a problem).</p> <p>I'm still looking for library in JavaScript. It's not hard to write, but I'd prefer to avoid inventing the wheel.</p>
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    1. USEduard Florinescu
    1. USDenis Otkidach
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    1. COI added a link in my answer to a Javascript implementation, which can perhaps be adapted to your needs. It's public domain but needs unit tests, I would say.
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      1. USVinay Sajip
    2. CODuplicate: http://stackoverflow.com/questions/183485/can-anyone-recommend-a-good-free-javascript-for-punycode-to-unicode-conversion
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      1. USSean Kinsey
    3. COThanks for the link. The question is not about just Punycode encoding implementation (it's easy), but a much bigger problem.
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      1. USDenis Otkidach
 

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