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simple yet lazy multipart handler on ruby
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# MIT License | |
# | |
# Copyright (c) 2018 Rei Hakurei | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a copy | |
# of this software and associated documentation files (the "Software"), to deal | |
# in the Software without restriction, including without limitation the rights | |
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
# copies of the Software, and to permit persons to whom the Software is | |
# furnished to do so, subject to the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in all | |
# copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
# SOFTWARE. | |
# | |
# Source: https://gist.github.com/ReiFan49/4330ea58837eac2e24c1c9bee6270903 | |
class Multipart | |
# RFC 1341 | |
BCHAR = "[0-9A-Za-z#{Regexp.escape("'()+_-./:=?")}]" | |
BCHARS = "(?:#{BCHAR}|\x20)" | |
BOUND = /(#{BCHARS}{0,69}#{BCHAR})$/ | |
BOUNDX = Regexp.compile(BOUND.source.chop,BOUND.options) | |
def initialize(bound=nil,*content) | |
init_bound(bound) | |
init_content(*content) | |
end | |
def boundary | |
@boundary | |
end | |
def <<(contents) | |
case contents | |
when Hash | |
body = contents.delete('body') | |
@content.push(Content.new(body,contents)) | |
when Array | |
contents.each { |content| | |
self[@content.length] = content | |
} | |
else | |
self << [contents] | |
end | |
end | |
def [](index) | |
@content.fetch(index,nil) | |
end | |
def []=(index,value) | |
case value | |
when NilClass | |
if index >= @content.size | |
@content.pop | |
elsif index < 0 | |
@content.shift | |
else | |
@content.delete_at(index) | |
end | |
nil | |
when Content,String | |
content = Content.parse(value) | |
if index >= @content.size | |
@content.push content | |
elsif index < 0 | |
@content.unshift content | |
else | |
@content[index] = content | |
end | |
content | |
else | |
fail TypeError, "Unsupported operation to convert `#{content.class}' into Content" | |
end | |
end | |
def boundary=(new_bound) | |
case new_bound | |
when NilClass, '' | |
rg = BCHAR[1...-1].scan(/.(?:[-].)?/).map{|x| | |
a,b = x[0],x[-1] | |
(a.ord).upto(b.ord).to_a.map(&:chr) | |
}.flatten.uniq | |
@boundary.replace(rand(32..70).times.to_a.map{rg.shuffle.first}*'') | |
else | |
md = BOUND.match(new_bound.to_s) | |
if md then | |
@boundary.replace(md.captures.join('')) | |
else | |
@boundary | |
end | |
end | |
end | |
def each(&block) | |
@content.each(&block) | |
end | |
def inspect | |
proc { |*args| | |
fail TypeError unless args.all?{|x|self.instance_variable_defined?(x)} | |
head = "%s:%%#0%dx"%[self.class.name,0.size<<1]%[__id__ << 1] | |
inst = args || self.instance_variables | |
sprintf("#<%s%s>", | |
head, | |
inst.size > 0 ? " %s" % ( inst.map{ |sym|"%s=%s" % [ sym,instance_variable_get(sym).inspect ] } * ', ') : '' | |
) | |
}.call(:@boundary) | |
end | |
def to_s | |
double = "-" * 2 | |
border = double + @boundary | |
separt = border + $/ | |
sprintf("%s%s%s",separt,@content.map{ |c| | |
"#{c}#{$/}" | |
} * separt,border + double); | |
end | |
class << self | |
def parse(raw) | |
return raw if raw.is_a?(Multipart) | |
md = /[-]{2}#{BOUND}/.match(raw) | |
return nil unless md | |
b = md[1] | |
md = /[-]{2}#{BOUNDX} | |
(.+) | |
[-]{2}\1[-]{2}/mx.match(raw) | |
return new(b) unless md | |
b = md[1] | |
c = md[2].split(/(?:\r\n?|\n)/).slice(1..-1) * ($/) | |
return new(b,*(c.split('-' * 2 + b))) | |
end | |
end | |
class Content | |
def initialize(body,head) | |
# Assertions | |
fail ArgumentError, 'Expected Content-Disposition header to be present' unless head.keys.include?('Content-Disposition') | |
@head = head || {} | |
@body = body || '' | |
@clones={} | |
end | |
def body | |
@clones[:body] ||= @body.dup.freeze | |
end | |
def body=(new_body) | |
@clones.delete :body | |
@body.replace(new_body) | |
end | |
def head | |
@clones[:head] ||= @head.dup.freeze | |
end | |
def [](key) | |
head.fetch(key,nil) | |
end | |
def []=(key,value) | |
@clones.delete :head | |
@head[k.to_s] = v.to_s | |
end | |
def each(&block) | |
@head.each(&block) | |
end | |
def inspect | |
proc { |*args| | |
fail TypeError unless args.all?{|x|self.instance_variable_defined?(x)} | |
head = "%s:%%#0%dx"%[self.class.name,0.size<<1]%[__id__ << 1] | |
inst = args || self.instance_variables | |
sprintf("#<%s%s>", | |
head, | |
inst.size > 0 ? " %s" % ( inst.map{ |sym|"%s=%s" % [ sym,instance_variable_get(sym).inspect ] } * ', ') : '' | |
) | |
}.call() | |
end | |
def to_s | |
sprintf("%s%s%s",@head.map{|k,d| | |
d.map { |v| sprintf("%s: %s",k,v) } * $/ | |
} * $/,$/*2,@body); | |
end | |
class << self | |
def parse(raw) | |
return raw if raw.is_a?(Content) | |
#'-----------------------------14013246541315956113474900849' | |
#'Content-Disposition: form-data; name="dir[]" ' | |
#' ' | |
#'/public_html/api ' | |
#'-----------------------------14013246541315956113474900849--' | |
head, body = raw.split(/(?:\r\n?|\n){2}/,2) | |
hdr = Hash.new { |h,k| h[k] = [] } | |
head.each_line { |line| | |
line.chomp! | |
k,v = line.split(': ',2) | |
hdr[k].push(v) unless k.nil? || v.nil? | |
} | |
body.chomp! | |
new(body,hdr) | |
end | |
end | |
protected | |
private | |
end | |
protected | |
private | |
def init_bound(b) | |
@boundary=String.new() | |
@boundary.define_singleton_method(:to_s) { | |
c = to_str | |
c = "\"#{c}\"" if /\x20/.match(c) | |
"boundary=#{c}" | |
} | |
self.boundary=b | |
end | |
def init_content(*c) | |
@content=(c.is_a?(Array)&& c.all?{|x|[Content,String].any?{|y|x.is_a?(y)}} && c) || [] | |
@content.map! { |x| x.is_a?(String) ? Content.parse(x) : x } | |
end | |
end |
Revision Note: make it to work with imgur example.
Just throw me some good multipart raw if it has some errors.
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The snippet is made around 2016 July. That's why i don't really remember the flow.