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:callback verification in JSONP #9075

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@homakov
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homakov commented Jan 25, 2013

Just a useful fix..

:callback verification in JSONP
Just a useful fix..
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homakov Jan 25, 2013

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As you see in the regexp (, ) and other chars are not allowed anymore..

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homakov commented Jan 25, 2013

As you see in the regexp (, ) and other chars are not allowed anymore..

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pseidemann Jan 25, 2013

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javascript functions can contain unicode characters: http://codepen.io/anon/pen/jzCqJ
see http://stackoverflow.com/a/9337047

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pseidemann commented Jan 25, 2013

javascript functions can contain unicode characters: http://codepen.io/anon/pen/jzCqJ
see http://stackoverflow.com/a/9337047

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rafaelfranca Jan 25, 2013

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Could you add tests?

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rafaelfranca commented Jan 25, 2013

Could you add tests?

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rafaelfranca Jan 25, 2013

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And yes, we need to support unicode

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rafaelfranca commented Jan 25, 2013

And yes, we need to support unicode

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@pseidemann i know, regexp is a very straightforward. What should i add to support unicode?
Tests will be added..

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homakov commented Jan 25, 2013

@pseidemann i know, regexp is a very straightforward. What should i add to support unicode?
Tests will be added..

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strict regexp looks like this :)

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Contributor

homakov commented Jan 25, 2013

strict regexp looks like this :)

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pseidemann Jan 25, 2013

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no I mean with this patch we would restrict javascript features.
surely it is better to only use ascii characters for the callback name but maybe some apps are needing this

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pseidemann commented Jan 25, 2013

no I mean with this patch we would restrict javascript features.
surely it is better to only use ascii characters for the callback name but maybe some apps are needing this

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lukaszx0 Mar 14, 2013

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@homakov how is it going? Do you need help with writing those tests?

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lukaszx0 commented Mar 14, 2013

@homakov how is it going? Do you need help with writing those tests?

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@strzalek thanks for reminder , this is not major PR, give me some more time. will try to get on tests soon

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homakov commented Mar 14, 2013

@strzalek thanks for reminder , this is not major PR, give me some more time. will try to get on tests soon

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lukaszx0 Mar 15, 2013

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@homakov would you mind closing this PR until then? You can always reopen it once you get a chance to work on this agian. Thanks.

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lukaszx0 commented Mar 15, 2013

@homakov would you mind closing this PR until then? You can always reopen it once you get a chance to work on this agian. Thanks.

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kitcambridge May 4, 2013

@homakov Actually, Ruby 1.9 supports Unicode categories, so you can condense the identifier validation logic significantly:

# Matches the `Identifier` production according to the ES 5 spec.
/\A
  (?!
    (?:
      # Exclude `BooleanLiteral`s and `NullLiteral`s.
      null|true|false|
      # Exclude `Keyword`s.
      break|case|catch|continue|debugger|default|delete|do|else|finally|for|
      function|if|in|instanceof|new|return|switch|this|throw|try|typeof|var|
      void|while|with|
      # Exclude `FutureReservedWord`s.
      class|const|enum|export|extends|import|super|
      # Exclude additional `FutureReservedWord`s in strict mode.
      implements|interface|let|package|private|protected|public|static|yield
    )$
  )
  # The `IdentifierStart` production is more restrictive than `IdentifierPart`.
  # This production disallows Unicode escape sequences, which the spec permits.
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}]
  # `IdentifierPart` relaxes the identifier character restrictions. `.` is not
  # permitted; however, it's included for compatibility with method names
  # expressed in dot notation.
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\u200c\u200d.]*
\Z/ux

In practice, though, using a Boolean literal, null, keyword, or reserved word as the callback identifier name will throw a SyntaxError (or TypeError, in the case of Booleans and null) when the browser parses the script—so I think the following should be sufficient:

/\A
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}]
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\u200c\u200d.]*
\Z/ux

kitcambridge commented May 4, 2013

@homakov Actually, Ruby 1.9 supports Unicode categories, so you can condense the identifier validation logic significantly:

# Matches the `Identifier` production according to the ES 5 spec.
/\A
  (?!
    (?:
      # Exclude `BooleanLiteral`s and `NullLiteral`s.
      null|true|false|
      # Exclude `Keyword`s.
      break|case|catch|continue|debugger|default|delete|do|else|finally|for|
      function|if|in|instanceof|new|return|switch|this|throw|try|typeof|var|
      void|while|with|
      # Exclude `FutureReservedWord`s.
      class|const|enum|export|extends|import|super|
      # Exclude additional `FutureReservedWord`s in strict mode.
      implements|interface|let|package|private|protected|public|static|yield
    )$
  )
  # The `IdentifierStart` production is more restrictive than `IdentifierPart`.
  # This production disallows Unicode escape sequences, which the spec permits.
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}]
  # `IdentifierPart` relaxes the identifier character restrictions. `.` is not
  # permitted; however, it's included for compatibility with method names
  # expressed in dot notation.
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\u200c\u200d.]*
\Z/ux

In practice, though, using a Boolean literal, null, keyword, or reserved word as the callback identifier name will throw a SyntaxError (or TypeError, in the case of Booleans and null) when the browser parses the script—so I think the following should be sufficient:

/\A
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}]
  [$_\p{Lu}\p{Ll}\p{Lt}\p{Lm}\p{Lo}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\u200c\u200d.]*
\Z/ux
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i think unicode should not be used at all. a-zA-Z0-9 ftw

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homakov commented May 5, 2013

i think unicode should not be used at all. a-zA-Z0-9 ftw

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mathiasbynens May 5, 2013

@homakov

strict regexp looks like this :) […]

Yeah, that’s the regular expression I generated for JavaScript. I’m not sure if it would work in Ruby, though — does Ruby exhibit the same UCS-2-like behavior as JavaScript?

@homakov

i think unicode should not be used at all. a-zA-Z0-9 ftw

Maybe throw in $ and _, but yeah — this is definitely the easiest solution. The allowed/disallowed Unicode symbols in JavaScript identifiers will change in ES6 anyway, and after that it may change every time a new Unicode version is released. In other words, using a regular expression to validate identifiers exactly as per ECMAScript introduces a maintainability burden.


@kitcambridge Sadly, that regex (while much more elegant) would cause some false positives. Supplementary Unicode characters (e.g. U+2F800 CJK Compatibility Ideograph, which is listed in the [Lo] category) are disallowed in identifier names, as JavaScript interprets them as two individual surrogate halves (e.g. \uD87E\uDC00) which don’t match any of the allowed Unicode categories. Your regex, however, would allow such a character IIUC. Also, the regex doesn’t account for the NaN, Infinity, and undefined edge cases. In strict mode, eval and arguments are disallowed, too. (Like you said, browsers would likely throw errors in those cases — but I’m not sure if we should be relying on that.)

mathiasbynens commented May 5, 2013

@homakov

strict regexp looks like this :) […]

Yeah, that’s the regular expression I generated for JavaScript. I’m not sure if it would work in Ruby, though — does Ruby exhibit the same UCS-2-like behavior as JavaScript?

@homakov

i think unicode should not be used at all. a-zA-Z0-9 ftw

Maybe throw in $ and _, but yeah — this is definitely the easiest solution. The allowed/disallowed Unicode symbols in JavaScript identifiers will change in ES6 anyway, and after that it may change every time a new Unicode version is released. In other words, using a regular expression to validate identifiers exactly as per ECMAScript introduces a maintainability burden.


@kitcambridge Sadly, that regex (while much more elegant) would cause some false positives. Supplementary Unicode characters (e.g. U+2F800 CJK Compatibility Ideograph, which is listed in the [Lo] category) are disallowed in identifier names, as JavaScript interprets them as two individual surrogate halves (e.g. \uD87E\uDC00) which don’t match any of the allowed Unicode categories. Your regex, however, would allow such a character IIUC. Also, the regex doesn’t account for the NaN, Infinity, and undefined edge cases. In strict mode, eval and arguments are disallowed, too. (Like you said, browsers would likely throw errors in those cases — but I’m not sure if we should be relying on that.)

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homakov May 6, 2013

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I think relying on this is stupid. Callback option is dead easy thing, you just use it for strict verification. And nothing more complex than $jquery_123123 should be accepted. Because the complex and "proper" verification with UTF symbols is just waste of time, IMO! If the developer needs something more he routinely writes his own thing

Please write your thoughts on final, simplified regexp

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homakov commented May 6, 2013

I think relying on this is stupid. Callback option is dead easy thing, you just use it for strict verification. And nothing more complex than $jquery_123123 should be accepted. Because the complex and "proper" verification with UTF symbols is just waste of time, IMO! If the developer needs something more he routinely writes his own thing

Please write your thoughts on final, simplified regexp

@homakov homakov closed this Feb 14, 2014

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