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Add information about the maximum lenght accepted by telegram for the start parameter in deep-linking. Add the base64 encoding suggestion.

Paolo Galeone 2018-10-13 14:04:21 +02:00
parent 0ab741b86f
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4
Types-of-Handlers.md

@ -35,6 +35,10 @@ Clicking this link will open your Telegram Client and show a big START button. W
Note that since telegram doesn't support spaces in deep linking parameters, you will have to manually split the single `Hello_World` argument, into `["Hello", "World!"]` (using `args[0].split('_')` for example)
You also have to pay attention to the maximum lenght accepted by Telegram itself. As stated in the [documentation](https://core.telegram.org/bots#deep-linking) the maximum lenght for the start parameter is 64.
Also, since this is an URL parameter, you have to pay attention on how to correctly pass the values in order to avoid passing URL reserved characters. Consier the usage of `base64.urlsafe_b64encode`.
## Pattern matching: The RegexHandler
For more complex inputs you can employ the [telegram.ext.RegexHandler](https://python-telegram-bot.readthedocs.io/en/latest/telegram.ext.regexhandler.html), which internally uses the `re`-module to match textual user input with a supplied pattern.