Ruby parsing JSON
Ruby parsing Json example:
json = '["a", "B", "C"]'
puts "Unsafe #{unsafe_json
(json).inspect}"
#Output Unsafe["a", "B", "C"]
Ruby parsing Json parses the above json string into Array. Such methods are not safe, for example:
json = 'puts "Danger
Will Robinson"'
puts "Unsafe #{unsafe_json
(json).inspect}"
What should I output? Unfortunately, there is no parsing anything, and a warning pops up: warning: character class has `[' without escape safe method as follows:
module SafeJSON
require 'monitor'
def SafeJSON.build_safe_json
ret = nil
waiter = ''
(MonitorMixin)
wait_cond = waiter.new_cond
do
$SAFE = 4
ret = {|json|
eval((/(["'])/s*:/s*
(['"0-9tfn/[{])/){"#{$1}=>#{$2}"}) }
do wait_cond.signal
end
end
do wait_
cond.wait_while { ? } end
return ret
end
@@parser = SafeJSON.build_safe_json
# Safely parse the JSON input
def (input)
@@(input)
rescue SecurityError
return nil
end
end
Including this Module, you can use Ruby to parse Json:
peoples=('
{"peoples":[{"name":"site120","
email":"site120@","sex":"male"},
{"name":"site120_2","email":"site1
[email protected]_2","sex":"Male_2"}]}')
puts peoples["peoples"][1]["name"]
#Output site120_2
Ruby on Rails
Rails has built-in support for AJAX through RJS. Maybe there are not many opportunities to use json, but as a convenient format for data exchange, please pay attention to the value.
Here, use the Json plugin and install the command
gem install json_pure
Example of use:
require "open-uri"
require 'json'
def index
uri = '*****'
response = nil
begin
open(uri) do |http|
response =
end
@json = JSON::parse(response)
rescue => text
#Exception handling ("GetMailListserror=" + text)
[:error] = 'Failed to get the mailing list. '
end
end
Here, the json parser requires the json format key that must be quoted. If there are no quotes, exceptions will be parsed.