CGI::QueryExtension
module CGI::QueryExtension
Mixin模块提供以下功能:
- 作为方法访问CGI环境变量。有关这些变量的列表,请参阅CGI类的文档。通过删除前导
HTTP_
(如果存在)并降低名称来暴露这些方法。例如,auth_type
将返回环境变量AUTH_TYPE
,accept
并将返回值HTTP_ACCEPT
。
2. 访问cookie,包括cookie属性。
3. 访问参数,包括params属性,并重载[]以通过键执行参数值查找。
4. #initialize_query方法用于初始化上述机制,处理多部分表单以及允许在“脱机”模式下使用该类。
属性
cookiesRW
获取cookie作为cookie-name => Cookie对的散列。
filesR
将上传的文件作为名称=>值对的散列
paramsR
获取参数作为name => values对的散列值,其中values是一个Array。
公共实例方法
显示来源
用给定的键获取参数的值。
如果该参数具有多个值,则仅检索第一个值; 使用参数来获取值的数组。
# File lib/cgi/core.rb, line 694
def [](key)
params = @params[key]
return '' unless params
value = params[0]
if @multipart
if value
return value
elsif defined? StringIO
StringIO.new("".force_encoding(Encoding::ASCII_8BIT))
else
Tempfile.new("CGI",encoding: Encoding::ASCII_8BIT)
end
else
str = if value then value.dup else "" end
str
end
end
has_key?(*args) Show source
如果给定的查询字符串参数存在,则返回true。
# File lib/cgi/core.rb, line 718
def has_key?(*args)
@params.has_key?(*args)
end
还有别名:key ?,包括?
include?(*args)
Alias for: has_key?
key?(*args)
Alias for: has_key?
keys(*args) Show source
将所有查询参数名称返回为String数组。
# File lib/cgi/core.rb, line 713
def keys(*args)
@params.keys(*args)
end
multipart?()显示源文件
返回表单是否包含multipart / form-data
# File lib/cgi/core.rb, line 686
def multipart?
@multipart
end
params=(hash) 显示源文件
设置所有参数。
# File lib/cgi/core.rb, line 455
def params=(hash)
@params.clear
@params.update(hash)
end
raw_cookie()显示源文件
将原始cookie作为字符串获取。
# File lib/cgi/core.rb, line 435
def raw_cookie
env_table["HTTP_COOKIE"]
end
raw_cookie2()显示源文件
将原始RFC2965 Cookie作为字符串获取。
# File lib/cgi/core.rb, line 440
def raw_cookie2
env_table["HTTP_COOKIE2"]
end
私有实例方法
initialize_query()显示源文件
一个包装类,用于将StringIO对象作为主体,并在传入阈值时切换到TempFile。初始化查询中的数据。
处理多部分表单(特别是涉及文件上传的表单)。在@params字段中读取查询参数,并将cookie写入@cookies。
# File lib/cgi/core.rb, line 641
def initialize_query()
if ("POST" == env_table['REQUEST_METHOD']) and
%r|\Amultipart/form-data.*boundary=\"?([^\";,]+)\"?|.match(env_table['CONTENT_TYPE'])
current_max_multipart_length = @max_multipart_length.respond_to?(:call) ? @max_multipart_length.call : @max_multipart_length
raise StandardError.new("too large multipart data.") if env_table['CONTENT_LENGTH'].to_i > current_max_multipart_length
boundary = $1.dup
@multipart = true
@params = read_multipart(boundary, Integer(env_table['CONTENT_LENGTH']))
else
@multipart = false
@params = CGI::parse(
case env_table['REQUEST_METHOD']
when "GET", "HEAD"
if defined?(MOD_RUBY)
Apache::request.args or ""
else
env_table['QUERY_STRING'] or ""
end
when "POST"
stdinput.binmode if defined? stdinput.binmode
stdinput.read(Integer(env_table['CONTENT_LENGTH'])) or ''
else
read_from_cmdline
end.dup.force_encoding(@accept_charset)
)
unless Encoding.find(@accept_charset) == Encoding::ASCII_8BIT
@params.each do |key,values|
values.each do |value|
unless value.valid_encoding?
if @accept_charset_error_block
@accept_charset_error_block.call(key,value)
else
raise InvalidEncoding,"Accept-Charset encoding error"
end
end
end
end
end
end
@cookies = CGI::Cookie::parse((env_table['HTTP_COOKIE'] or env_table['COOKIE']))
end
read_from_cmdline()显示源文件
离线模式。在标准输入上读取名称=值对。
# File lib/cgi/core.rb, line 606
def read_from_cmdline
require "shellwords"
string = unless ARGV.empty?
ARGV.join(' ')
else
if STDIN.tty?
STDERR.print(
%Q|(offline mode: enter name=value pairs on standard input)\n|
)
end
array = readlines rescue nil
if not array.nil?
array.join(' ').gsub(/\n/n, '')
else
""
end
end.gsub(/\=/n, '%3D').gsub(/\&/n, '%26')
words = Shellwords.shellwords(string)
if words.find{|x| /=/n.match(x) }
words.join('&')
else
words.join('+')
end
end
read_multipart(boundary, content_length)显示源
根据分析多部分表单元素
http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2
根据多部分表单元素是否超过10 KB,返回多部分表单参数与StringIO或Tempfile类型主体的散列
params[name => body]
# File lib/cgi/core.rb, line 469
def read_multipart(boundary, content_length)
## read first boundary
stdin = stdinput
first_line = "--#{boundary}#{EOL}"
content_length -= first_line.bytesize
status = stdin.read(first_line.bytesize)
raise EOFError.new("no content body") unless status
raise EOFError.new("bad content body") unless first_line == status
## parse and set params
params = {}
@files = {}
boundary_rexp = /--#{Regexp.quote(boundary)}(#{EOL}|--)/
boundary_size = "#{EOL}--#{boundary}#{EOL}".bytesize
buf = ''
bufsize = 10 * 1024
max_count = MAX_MULTIPART_COUNT
n = 0
tempfiles = []
while true
(n += 1) < max_count or raise StandardError.new("too many parameters.")
## create body (StringIO or Tempfile)
body = create_body(bufsize < content_length)
tempfiles << body if defined?(Tempfile) && body.kind_of?(Tempfile)
class << body
if method_defined?(:path)
alias local_path path
else
def local_path
nil
end
end
attr_reader :original_filename, :content_type
end
## find head and boundary
head = nil
separator = EOL * 2
until head && matched = boundary_rexp.match(buf)
if !head && pos = buf.index(separator)
len = pos + EOL.bytesize
head = buf[0, len]
buf = buf[(pos+separator.bytesize)..-1]
else
if head && buf.size > boundary_size
len = buf.size - boundary_size
body.print(buf[0, len])
buf[0, len] = ''
end
c = stdin.read(bufsize < content_length ? bufsize : content_length)
raise EOFError.new("bad content body") if c.nil? || c.empty?
buf << c
content_length -= c.bytesize
end
end
## read to end of boundary
m = matched
len = m.begin(0)
s = buf[0, len]
if s =~ /(\r?\n)\z/
s = buf[0, len - $1.bytesize]
end
body.print(s)
buf = buf[m.end(0)..-1]
boundary_end = m[1]
content_length = -1 if boundary_end == '--'
## reset file cursor position
body.rewind
## original filename
/Content-Disposition:.* filename=(?:"(.*?)"|([^;\r\n]*))/i.match(head)
filename = $1 || $2 || ''
filename = CGI.unescape(filename) if unescape_filename?()
body.instance_variable_set(:@original_filename, filename.taint)
## content type
/Content-Type: (.*)/i.match(head)
(content_type = $1 || '').chomp!
body.instance_variable_set(:@content_type, content_type.taint)
## query parameter name
/Content-Disposition:.* name=(?:"(.*?)"|([^;\r\n]*))/i.match(head)
name = $1 || $2 || ''
if body.original_filename.empty?
value=body.read.dup.force_encoding(@accept_charset)
body.close! if defined?(Tempfile) && body.kind_of?(Tempfile)
(params[name] ||= []) << value
unless value.valid_encoding?
if @accept_charset_error_block
@accept_charset_error_block.call(name,value)
else
raise InvalidEncoding,"Accept-Charset encoding error"
end
end
class << params[name].last;self;end.class_eval do
define_method(:read){self}
define_method(:original_filename){""}
define_method(:content_type){""}
end
else
(params[name] ||= []) << body
@files[name]=body
end
## break loop
break if content_length == -1
end
raise EOFError, "bad boundary end of body part" unless boundary_end =~ /--/
params.default = []
params
rescue Exception
if tempfiles
tempfiles.each {|t|
if t.path
t.close!
end
}
end
raise
end