Class: Stupeflix::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/stupeflix/base.rb

Direct Known Subclasses

StupeflixClient

Instance Method Summary collapse

Constructor Details

#initialize(accessKey, privateKey, host = "http://services.stupeflix.com", service = 'stupeflix-1.0', debug = false) ⇒ Base

Returns a new instance of Base.



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# File 'lib/stupeflix/base.rb', line 9

def initialize( accessKey, privateKey, host = "http://services.stupeflix.com", service = 'stupeflix-1.0', debug = false)
  @accessKey = accessKey
  @privateKey = privateKey
  len = host.length - 7
  if host[host.length - 1, 1] == "/"
    host = host[0, host.length - 1]
  end

  @host = host[7,len]
  @base_url = service
  @debug = debug
  @service = service
  @TEXT_XML_CONTENT_TYPE = "text/xml"
  @APPLICATION_ZIP_CONTENT_TYPE = "application/zip"
  @APPLICATION_JSON_CONTENT_TYPE = "application/json"
  @APPLICATION_URLENCODED_CONTENT_TYPE = "application/x-www-form-urlencoded"
  @PROFILES_PARAMETER = "Profiles"
  @XML_PARAMETER = "ProfilesXML"
  @MARKER_PARAMETER = "Marker"
  @MAXKEYS_PARAMETER = "MaxKeys"
  # Currently there is only the Marker parameter (used for partial enumeration)
  @parametersToAdd = [@MARKER_PARAMETER, @MAXKEYS_PARAMETER]
  @sleepTime = 1.0
  @maxRetry = 4
  @base = true
end

Instance Method Details

#answer_error(answer, message) ⇒ Object

Raises:

  • (StandardError) 


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# File 'lib/stupeflix/base.rb', line 117

def answer_error( answer, message)
  raise StandardError, sprintf( "%s\n%s", message,  answer['body'])
end

#connectionGet ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 36

def connectionGet
  return Connection.new(@host, "/" + @base_url)
end

#error(message) ⇒ Object

Raises:

  • (StandardError) 


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# File 'lib/stupeflix/base.rb', line 112

def error( message)
  logdebug(message)
  raise StandardError, message
end

#getContent(url, filename = nil, parameters = nil) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 183

def getContent( url, filename = nil, parameters = nil)
  sleepTime = @sleepTime

  for i in 0..@maxRetry
    raiseExceptionOn404 = (i + 1) == @maxRetry
    ret = getContent_(url, filename, parameters, raiseExceptionOn404)
    if ret["status"] != 404
      return ret
    end
    # Wait for amazon S3 ...
    sleep(1)
  end
end

#getContent_(url, filename = nil, parameters = nil, raiseExceptionOn404 = true) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 197

def getContent_( url, filename = nil, parameters = nil, raiseExceptionOn404 = true)
  method = "GET"
  url = getContentUrl(url, method, parameters)

  # GET DATA
  conn = connectionGet()
  answer = conn.request_get(url)
  body = answer['body']

  headers = answer['headers']
  status = headers['status'].to_i

  if status == 204
    # there was no content
    obtainedSize = 0
    if body.length != 0
      error("204 status with non empty body.")
    end
  elsif status == 200
    obtainedSize =headers['content-length'].to_i
  elsif status == 404 and not raiseExceptionOn404
    return  {"url" => headers['content-location'], "status" => 404}
  else
    msg = sprintf( "getContent : bad STATUS %s", status )
    answer_error(answer, msg)
  end

  if body.length != obtainedSize
    error("Non matching body length and content-length")
  end

  if filename != nil
    f = File.open(filename, 'w')
    f.write(body)
    f.close

    if obtainedSize == 0
      File.unlink(filename)
    else
      filesize = File.stat(filename).size
      if obtainedSize != filesize
        File.unlink(filename)
        error(sprintf( "file size is incorrect : file size = %d, body size = %d", filesize, obtainedSize))
      end
    end
  end

  # NOW CHECK EVERYTHING IS OK
  md5, md5hex, md5base64 = md5FileOrBody(filename, body)

  if status != 204
    obtainedMD5 = headers['etag'].gsub(/"/,"")
    if obtainedMD5 != md5hex
      if filename
        File.unlink(filename)
      end
      error(sprintf( "getDefinition : bad returned etag %s =! %s (ref)", md5hex, obtainedMD5))
    end
  end

  if status == 200
    logdebug(sprintf( "headers = %s", headers) )
    url = headers['content-location']
    ret = {'size' => obtainedSize, 'url' => url, 'headers' =>  headers}
  else
    ret = {'size' => obtainedSize, 'url' => url}
  end

  if not filename
    ret['body'] = body
  end

  ret["status"] = status

  return ret
end

#getContentUrl(url, method, parameters) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 179

def getContentUrl( url, method, parameters)
  return signUrl(url, method, "", "", parameters)
end

#isZip(filename) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 100

def isZip( filename)
  f = File.open(filename, 'r')
  header = f.read(4)
  return header == 'PK'+3.chr+4.chr
end

#logdebug(s) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 106

def logdebug( s)
  if @debug
    print s.to_s
  end
end

#md5FileOrBody(filename, body = nil) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 76

def md5FileOrBody( filename, body = nil)
  md5 = Digest::MD5.new()

  if body != nil
    md5.update(body)
  else
    chunksize=1024
    f = File.open(filename, 'r')

    while true
      chunk = f.read(chunksize)
      if not chunk
        break
      end
      md5.update(chunk)
    end
    f.close
  end

  digest = md5.digest

  return [digest, md5.hexdigest, Base64.encode64(digest).strip]
end

#paramString(parameters) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 40

def paramString( parameters)
  paramStr = ""
  if parameters != nil
    @parametersToAdd.each do |p|
      if parameters.include?(p)
        paramStr += sprintf( "%s\n%s\n", p, parameters[p])
      end
    end
  end
  return paramStr
end

#sendContent(method, url, contentType, filename = nil, body = nil, parameters = nil, sendcallback = nil) ⇒ Object

sendcallback is an object with

- a 'sendCallBack' member function that accept a unique int argument (=number of bytes written so far)
- a 'sendBlockSize' member function with no argument which return the size of block to be sent



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# File 'lib/stupeflix/base.rb', line 124

def sendContent( method, url, contentType, filename = nil, body = nil,  parameters = nil, sendcallback = nil)

  # SEND DATA
  conn = connectionGet()

  md5, md5hex, md5base64 = md5FileOrBody(filename, body)

  if filename
    size = File.stat(filename).size
  else
    size = body.length
  end

  headers = {'Content-MD5' => md5base64.to_s,
             'Content-Length' => size.to_s,
             'Content-Type' => contentType}

  url = signUrl(url, method, md5base64, contentType, parameters)

  # LAUNCH THE REQUEST : TODO : pass filename instead of body
  if method == "PUT"
    answer = conn.request_put(url, args = nil, body = body, filename = filename, headers = headers, sendcallback = sendcallback)
  elsif method == "POST"
    answer = conn.request_post(url,  args = nil, body = body, filename = filename, headers = headers)
  elsif method == "DELETE"
    answer = conn.request_delete(url, headers = headers)
  end

  headers = answer['headers']

  logdebug(headers)
  logdebug(answer['body'])

  # NOW CHECK THAT EVERYTHING IS OK
  status = headers['status']
  if status != '200'
    msg = sprintf( "sendContent : bad STATUS %s", status )
    answer_error(answer, msg)
  end

  if headers['etag'] == nil
    msg = "corrupted answer: no etag in headers. Response body is " + answer['body']
    error(msg)
  end

  obtainedMD5 = headers['etag']

  if obtainedMD5 != md5hex
    msg = sprintf( "sendContent : bad returned etags %s =! %s (ref)", obtainedMD5, md5hex)
    error(msg)
  end

  return answer
end

#sign(strToSign, secretKey) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 58

def sign( strToSign, secretKey)
  digest  = OpenSSL::Digest::Digest.new('sha1')
  return OpenSSL::HMAC.hexdigest(digest, secretKey, strToSign)
end

#signUrl(url, method, md5, mime, parameters = {}) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 63

def signUrl( url, method, md5, mime, parameters = {})
  now =Time.now.to_i
  strToSign = strToSign(method, url, md5, mime, now, parameters)
  signature = sign(strToSign, @privateKey)
  url += sprintf( "?Date=%s&AccessKey=%s&Signature=%s", now, @accessKey,signature)
  if parameters
    parameters.each_pair do |k,v|
      url += sprintf("&%s=%s", k,v)
    end
  end
  return url
end

#strToSign(method, resource, md5, mime, datestr, parameters) ⇒ Object 



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# File 'lib/stupeflix/base.rb', line 52

def strToSign( method, resource, md5, mime, datestr, parameters)
  paramStr = paramString(parameters)
  stringToSign  = sprintf( "%s\n%s\n%s\n%s\n%s\n%s", method, md5, mime, datestr, '/' + @service + resource, paramStr)
  return stringToSign
end