Module: DataUri

Defined in:
lib/datauris.rb,
lib/datauris/version.rb

Constant Summary collapse

REGEX =

make parameters key/value more strict - why? why not?

e.g. MIME_PARAM_RE = /^;([-\w.+]+)=([^;,]+)/.freeze

allow  +(plus) or .(dot) in param key - possible?? why? why not?

%r{
  \A
  data:
  (?<mediatype>
    (?:
        (?<type> [\w-]+? )  
         / 
        (?<subtype> [\w.+-]+? )
    )?
    (?<parameters> (?: ; 
                       [\w-]+? 
                          = 
                          .+? 
                    )* 
    )
  )?
  (?:;
     (?<extension>base64|utf8)
   )?
  ,
  (?<data>
    (?:.|[\n\r])*
  )
  \z
}x
NOT_SAFECHARS_RX = 
/([^a-zA-Z0-9\-_.~]+)/
MAJOR =

todo: namespace inside version or something - why? why not??

1
MINOR = 
2
PATCH = 
0
VERSION = 
[MAJOR,MINOR,PATCH].join('.')

Class Method Summary collapse

Class Method Details

._parse(str) ⇒ Object 



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# File 'lib/datauris.rb', line 69

def self._parse( str ) REGEX.match( str ); end



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# File 'lib/datauris/version.rb', line 12

def self.banner
  "datauris/#{VERSION} on Ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}) [#{RUBY_PLATFORM}] in (#{root})"
end

.build(data, type = nil, base64: nil, utf8: nil, uri: nil) ⇒ Object Also known as: encode

base64 - force base64 encoding instead of “automagic” (base64: true) utf8 - or force utf8 encoding (utf8: true) uri - or force STOPPING uri encoding (uri: false)



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# File 'lib/datauris.rb', line 178

def self.build( data, type=nil, base64: nil, utf8: nil, uri: nil )
    str = "data:"
    str += type      if type   ## note: allow optional / no type

    
    ## puts "  type: #{type.inspect}, base64: #{base64.inspect}"


    ## add more (binary) media types here - why? why not?

    ##   note svg is text AND an image => image/svg+xml

    if base64.nil?                   
        base64 = if type 
                   if type.start_with?( 'image/svg+xml' )
                     false
                   elsif type.start_with?( 'image/') ||
                         type.start_with?( 'application/octet-stream' )
                     true
                   else 
                     false
                   end
                 else # no type (assume text)

                    false
                 end
    end

    if base64    
        str += ";base64," + Base64.strict_encode64( data )
    elsif utf8 
        str += ";utf8," + data          
    else
        ## use encode_uri_component by default - why? why not?

        ##  space becomes %20

        ##  :     becomes %3A

        ##  ,     becomes %2C  and so on

        ##

        ## note: use uri: false to turn of uri encode!!!

        str += "," +  (uri == false ? data : encode_uri( data ))
    end   
end

.encode_uri(str) ⇒ Object 



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# File 'lib/datauris.rb', line 167

def self.encode_uri( str )
  encoding = str.encoding
  str.b.gsub( NOT_SAFECHARS_RX ) do |m|
    '%' + m.unpack('H2' * m.bytesize).join('%').upcase
  end.force_encoding(encoding)
end

.parse(str, utf8: false) ⇒ Object Also known as: decode

allow force utf8 with utf8: true



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# File 'lib/datauris.rb', line 71

def self.parse( str, utf8: false )   ## allow force utf8 with utf8: true

    m = _parse( str ) 
  
    if m
      ## 1) return mediatype (mimetype PLUS optional parameters)

      ## 2) return data (base64 decoded or not)

  
      ## todo/check:

      ##   add force_encoding( 'UTF-8' ) to returned data (if not base64) - why? why not?


      mediatype = m[:mediatype]  
      data      = if m[:extension] && m[:extension] == 'base64'  ## assume base64 encoded

                     Base64.strict_decode64(m[:data])
                  elsif utf8 || (m[:extension] && m[:extension] == 'utf8')
                     m[:data]    ## note: no decode; assume "plain" utf8 string  

                  else
                     ## e.g. %20 => space(20)

                     ##  etc.

                     ## todo/double check - use a different URI decoder - why? why not?

                     URI.decode_uri_component(m[:data])
                  end

      ## returns data first!!!

      ##  and mediatype second (to follow the order in build)

      ##   - also mediatype is optional -  arguable more intuitive - yes,no?

      [data, mediatype]
    else
       raise ArgumentError, "invalid datauri - cannot match regex; sorry"
    end
end

.root ⇒ Object 



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# File 'lib/datauris/version.rb', line 16

def self.root
  File.expand_path( File.dirname(File.dirname(File.dirname(__FILE__))) )
end

.valid?(str, utf8: false) ⇒ Boolean Also known as: is_valid?

Returns:

  • (Boolean) 


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# File 'lib/datauris.rb', line 103

def self.valid?( str, utf8: false )
  m = _parse( str )
  if m 
    if m[:extension] && m[:extension] == 'base64'   ## assume base64

      begin
        Base64.strict_decode64(m[:data])
        true
      rescue ArgumentError
        false
      end
    elsif utf8 || (m[:extension] && m[:extension] == 'utf8') 
       true   ## pass through as is; assume always true (check valid utf8 encoding - why? why not?) 

    else
      begin 
        URI.decode_uri_component(m[:data])            
        true
      rescue ArgumentError   ## check if decode errors are argument errors??

        false
      end
    end
  else
    false
  end
end

.version ⇒ Object 



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# File 'lib/datauris/version.rb', line 8

def self.version
  VERSION
end