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djacobs / PyAPNs

Python library for interacting with the Apple Push Notification service (APNs)
http://pypi.python.org/pypi/apns/
MIT License
1.22k stars 374 forks source link

Enable unicode emoji in APNS messages #167

Closed simonw closed 8 years ago

simonw commented 8 years ago

Refs #127 - this change allows unicode Emoji sequences to be sent as push notification banners, e.g.:

Payload({"alert": u"This has emoji! \u1F4A9"})
ExplodingCabbage commented 8 years ago

This fails the tests because it increases the size of any payloads that use non-ASCII characters (dramatically - you're trebling the number of bytes used to represent two-byte UTF-8 characters, and doubling the number needed to represent three-byte UTF-8 characters, since JSON's ASCII-only escape sequences for non-ASCII characters are much less byte-efficient than UTF-8).

I don't think this is a tradeoff we can accept. If we merged this, we'd be significantly reducing the maximum message length that could be sent in non-Latin-alphabet languages like Chinese / Arabic / Hebrew, and we could cause errors or significant increases in required bandwidth for people updating their PyAPNs version on what was previously a stable working deployment.

Using JSON escape sequences for emojis instead of UTF-8 encoding them may be the right fix here (I don't have a clue why the bug described in https://github.com/djacobs/PyAPNs/issues/127 exists in the first place, so I'm poorly qualified to suggest solutions), but this PR is evil in its current state. Closing (though hopeful that you'll figure out a less problematic solution and open a new PR!)