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⚠ Be careful with unicode ⚠

16 points by im3w1l ↗ HN
Unicode has a lot of little known features. If you allow user generated content you should probably use a whitelist of acceptable symbols. Otherwise people may wreak havoc with right-to-left-overrides, zalgo, or most recently, color symbols.

21 comments

[ 3.9 ms ] story [ 69.8 ms ] thread
rbinv
I really don't think an explicit character whitelist is feasible. Kind of defeats the purpose of unicode, no?
nwh
Ⓘ ⒽѦ℣Є Ѝ☺ ⒾℶⒺѦ ШℍΛṮ ⑂Оμ'℞Ⓔ ⓉⒶℓĹĸⅠИҀ ѦβⓄⓊŦ
Kenji
That sounds like a good idea, but how can I whitelist symbols of languages I don't even know? Can you recommend a good whitelist?
M4v3R
Interesting, that on iOS the symbol is monochrome in the submission title, but gets turned into an emoji in the browser title bar: http://i.imgur.com/IFdHwNv.jpg
ickrick
The character has a glyph in HN's font, so it's rendered with that w/in the page. The title bar uses system fonts (just like tabs on OS X) which use emoji for most of the 'symbol' code points.
patio11
CJKのホワイトリストを作るのは少し時間かかりますけどね。まあ、読めない外国語そのものが迷惑だと思う人もいるから、LATIN-1の範囲にすれば問題ないでしょう。
MCRed
如果你只有Latin-1的白名单，这是非常种族优越感。也许我们可以做的只有控制字符的黑名单？

不过说真的，你的代码应该支持阿拉伯语和其他左到右的语言，日语等。

MCRed
Rúguǒ nǐ zhǐyǒu Latin-1 de bái míngdān, zhè shì fēicháng zhǒngzú yōuyuè gǎn. Yěxǔ wǒmen kěyǐ zuò de zhǐyǒu kòngzhì zìfú de hēi míngdān?

Bùguò shuō zhēn de, nǐ de dàimǎ yīnggāi zhīchí ālābó yǔ hé qítā zuǒ dào yòu de yǔyán, rìyǔ děng.

MCRed
إذا قمت بإجراء القائمة البيضاء فقط اللاتيني-1، انها الإثنية جدا. ربما يمكن للمرء أن جعل القائمة السوداء فقط من أحرف التحكم؟

ولكن في الحقيقة، يجب أن التعليمات البرمجية دعم اللغة العربية وغيرها من اللغات اليسار إلى اليمين، اليابانية، الخ

fabulist
This is a test‣

That was a RTL override character. Seems to have had no effect. Interestingly however, it seems HN gave me 0 points to start instead of 1.

joezydeco
#فͤ҈ͨͥ҉҉ͦ҈҉ͨ҈ͩ҉ͪ҈ͣͯͫ҉ͥͬͨ҈ͭ҉ͮ҈ͯ҉ͨ҈ͭͭͬ҉ͧͥ҈ͣ҉ͨ҉҉҈ͧͥ҉ͯ҈ͮͥ҉ͭ҈ͤ҈ͦ҈ͥ҉ͧ҈ͩͯ҉ͭ҈ͨ҉ͨͥ҉҉ͣ҉ͣͪ҉ͧ҈ͭ҉ͩ҈ͤ҉ͮ҈ͯͥ҈ͬ҈ͭ҈ͦ҈ͨͣ҉ͥ҈ͯ҉҉ͣͧ҈ͫ҉ͭ҈ͥͯͯ҉ͦ҈ͥ҉ͧ҉҈ͩ҉ͭ҈ͣͨ҉ͣͥ҈ͪ҉ͧ҈ͭᅠ'̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏ ᅠᅠ'̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋̋ กิิิิิิิิิิิิิิิิิิิิิิก้้้้้้้้้้้้้้้้้้้้้้ก็็็็็็็็็็็็็็็็็็็็็็ก้้้้้้้้้้้้้้้้้้้้้้ก็็็็็็็็็็็็็็็็็็็็็็กิิิิิิิิิิิิิิิิิิิิิิ ͥͦͧͣͤ ͦͧͣͤͥ ͧͣͤͥͦ ͣͤͥͦͧ ͤͥͦͧͣ ͥͦͧͣͤ ͦͧͣͤͥ ͧͣͤͥͦ ͣͤͥͦͧ ͤͥͦͧͣ ͥͦͧͣͤ ͦͧͣͤͥ ͧͣͤͥͦ ͣͤͥͦͧ ͤͥͦͧͣ ͥͦͧͣͤ ͦͧͣͤͥ ͧͣͤͥͦ ͥͦͧͣͤ ͦͧͣͤͥ ͧͣͤͥͦ ͥͦͧͣͤ ͦͧͣͤͥ ▲▲▲̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏̏ Never heard of this.
albertzeyer
So, what's a good whitelist (or set of whitelisted Unicode ranges)?
hyperpape
This is just not helpful. I know Unicode has "weird stuff" in it. If I didn't, this post would not do much to teach me about them.

As for a whitelist, it sounds like an incredibly huge effort to write a good one. Telling me I should do it without commenting on whether anyone else has tried and succeeded or failed leaves me where I was before reading this post. I was already thinking "boy, Unicode has some weird stuff in it. Wonder what I should do about it?"