Class: Aspera::Rest

Inherits:
Object
  • Object
show all
Defined in:
lib/aspera/rest.rb

Overview

Make HTTP calls, equivalent to rest-client rest call errors are raised as exception RestCallError and error are analyzed in RestErrorAnalyzer

Constant Summary collapse

MAX_ITEMS =

Special query parameter: max number of items for list command

'max'
MAX_PAGES =

Special query parameter: max number of pages for list command

'pmax'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_url:, auth: {type: :none}, not_auth_codes: ['401'], redirect_max: 0, headers: {}) ⇒ Rest

Create a REST object for API calls HTTP sessions parameters can be modified using global parameters in RestParameters For example, TLS verification can be skipped.

Parameters:

  • base_url (String) —

    base URL of REST API

  • auth (Hash) (defaults to: {type: :none}) —

    authentication parameters: :type (:none, :basic, :url, :oauth2) :username [:basic] :password [:basic] :url_query [:url] a hash :* [:oauth2] see OAuth::Factory class

  • not_auth_codes (Array) (defaults to: ['401']) —

    codes that trigger a refresh/regeneration of bearer token

  • redirect_max (Integer) (defaults to: 0) —

    max redirection allowed

  • headers (Hash) (defaults to: {}) —

    default headers to include in all calls



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# File 'lib/aspera/rest.rb', line 273

def initialize(
  base_url:,
  auth: {type: :none},
  not_auth_codes: ['401'],
  redirect_max: 0,
  headers: {}
)
  Aspera.assert_type(base_url, String)
  # base url with no trailing slashes (note: string may be frozen)
  @base_url = base_url.chomp('/')
  # remove trailing port if it is 443 and scheme is https
  @base_url = @base_url.gsub(/:443$/, '') if @base_url.start_with?('https://')
  @base_url = @base_url.gsub(/:80$/, '') if @base_url.start_with?('http://')
  Log.log.debug{"Rest.new(#{@base_url})"}
  # default is no auth
  @auth_params = auth
  Aspera.assert_type(@auth_params, Hash)
  Aspera.assert(@auth_params.key?(:type)){'no auth type defined'}
  @not_auth_codes = not_auth_codes
  Aspera.assert_type(@not_auth_codes, Array)
  # persistent session
  @http_session = nil
  @redirect_max = redirect_max
  Aspera.assert_type(@redirect_max, Integer)
  @headers = headers.clone
  Aspera.assert_type(@headers, Hash)
  @headers['User-Agent'] ||= RestParameters.instance.user_agent
  # OAuth object (created on demand)
  @oauth = nil
end

Instance Attribute Details

#auth_params ⇒ Object (readonly)

All original constructor parameters



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# File 'lib/aspera/rest.rb', line 241

def auth_params
  @auth_params
end

#base_url ⇒ Object (readonly)

The root URL for the API



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# File 'lib/aspera/rest.rb', line 244

def base_url
  @base_url
end

#headers ⇒ Object (readonly)

Base common headers of API



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# File 'lib/aspera/rest.rb', line 247

def headers
  @headers
end

Class Method Details

.basic_authorization(user, pass) ⇒ String

Returns Basic auth token.

Returns:

  • (String) —

    Basic auth token



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# File 'lib/aspera/rest.rb', line 82

def basic_authorization(user, pass); return "Basic #{Base64.strict_encode64("#{user}:#{pass}")}"; end

.build_uri(url, query) ⇒ Object

Build URI from URL and parameters and check it is ‘http` or `https`. Check if php style is specified. `nil` values in query result in key without value, e.g. `?a`, while empty string values result in `?a=`.

Parameters:

  • url (String) —

    The URL without query.

  • query (Hash, Array, String) —

    The query.



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# File 'lib/aspera/rest.rb', line 97

def build_uri(url, query)
  uri = URI.parse(url)
  Aspera.assert_values(uri.scheme, %w[http https]){'URI scheme'}
  return uri if query.nil? || query.respond_to?(:empty?) && query.empty?
  Log.dump(:query, query)
  uri.query =
    case query
    when String
      query
    when Hash
      URI.encode_www_form(h_to_query_array(query))
    when Array
      Aspera.assert(query.all?{ |i| i.is_a?(Array) && i.length.eql?(2)}){'Query must be array of arrays of 2 elements'}
      URI.encode_www_form(query) # remove nil values
    else Aspera.error_unexpected_value(query.class){'query type'}
    end.gsub('%5B%5D=', '[]=')
  # [] is allowed in url parameters
  uri
end

.h_to_query_array(query) ⇒ Object

Support array for query parameter, there is no standard. Either p=1&p=2 (default) or p[]=1&p=2 (if ‘:x_array_php_style` is set to true in query)

Parameters:

  • query (Hash) —

    HTTP query as hash



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# File 'lib/aspera/rest.rb', line 121

def h_to_query_array(query)
  Aspera.assert_type(query, Hash)
  suffix = query.delete(:x_array_php_style) ? '[]' : nil
  query.each_with_object([]) do |(k, v), query_array|
    case v
    when Array
      v.each do |e|
        query_array.push(["#{k}#{suffix}", e])
      end
    else
      query_array.push([k, v])
    end
  end
end

.io_http_session(http_session) ⇒ Object

get Net::HTTP underlying socket i/o little hack, handy because HTTP debug, proxy, etc… will be available used implement web sockets after ‘start_http_session`



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# File 'lib/aspera/rest.rb', line 177

def io_http_session(http_session)
  Aspera.assert_type(http_session, Net::HTTP)
  # Net::BufferedIO in net/protocol.rb
  result = http_session.instance_variable_get(:@socket)
  Aspera.assert(!result.nil?){"no socket for #{http_session}"}
  return result
end

.parse_header(header) ⇒ Hash

Parses an HTTP Content-Type header string into its media type and parameters according to RFC 9110 and RFC 6838. TODO: use gem: content_type

Parameters:

  • header (String) —

    The Content-Type header string, e.g., “application/json; charset=utf-8”

Returns:

  • (Hash) —

    A hash with :type and :parameters keys. Example:

    {
  type: "application/json",
  parameters: {
    charset: "utf-8",
    version: "1.0"
  }
}



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# File 'lib/aspera/rest.rb', line 216

def parse_header(header)
  parts = header.split(';').map(&:strip)
  media_type = parts.shift.downcase
  parameters = parts.filter_map do |param|
    key, value = param.split('=', 2)
    next unless key && value
    key = key.strip.downcase.to_sym
    value = value.strip.gsub(/\A"|"\z/, '')
    [key, value]
  end.to_h
  {type: media_type, parameters: parameters}
end

.php_style(query) ⇒ Object

Indicate that the given Hash query uses php style for array parameters

Parameters:

  • query (Hash) —

    A key can have Array value and result will use PHP format: a[]=1&a=2



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# File 'lib/aspera/rest.rb', line 86

def php_style(query)
  Aspera.assert_type(query, Hash){'query'}
  query[:x_array_php_style] = true
  query
end

.query_to_h(query) ⇒ Hash

Decode query string as Hash if parameter is only once, then it’s a scalar if a parameter is several, then it’s array if parameter has [] then it’s an array, and [] is removed Support arrays in query string, e.g. PHP’s way is p[]=1&p=2

Parameters:

  • query (String) —

    query string as in URI.query

Returns:

  • (Hash) —

    decoded query



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# File 'lib/aspera/rest.rb', line 143

def query_to_h(query)
  URI.decode_www_form(query).each_with_object({}) do |(key, value), h|
    if key.end_with?('[]')
      key = key[..-3]
      h[key] = [] unless h.key?(key)
    end
    if h.key?(key)
      h[key] = [h[key]] if !h[key].is_a?(Array)
      h[key].push(value)
    else
      h[key] = value
    end
  end
end

.remote_certificate_chain(url, as_string: true) ⇒ String

Returns PEM certificates of remote server.

Returns:

  • (String) —

    PEM certificates of remote server



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# File 'lib/aspera/rest.rb', line 186

def remote_certificate_chain(url, as_string: true)
  result = []
  # initiate a session to retrieve remote certificate
  http_session = Rest.start_http_session(url)
  begin
    # retrieve underlying openssl socket
    result = Rest.io_http_session(http_session).io.peer_cert_chain
  rescue
    result = http_session.peer_cert
  ensure
    http_session.finish
  end
  result = result.map(&:to_pem).join("\n") if as_string
  return result
end

.start_http_session(base_url) ⇒ Net::HTTP

Start a HTTP/S session, also used for web sockets

Parameters:

  • base_url (String) —

    Base url of HTTP/S session

Returns:

  • (Net::HTTP) —

    A started HTTP session



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# File 'lib/aspera/rest.rb', line 161

def start_http_session(base_url)
  uri = URI.parse(base_url)
  Aspera.assert_values(uri.scheme, %w[http https]){'URI scheme'}
  # This honors http_proxy env var
  http_session = Net::HTTP.new(uri.host, uri.port)
  http_session.use_ssl = uri.scheme.eql?('https')
  # Set http options in callback, such as timeout and cert. verification
  RestParameters.instance.session_cb&.call(http_session)
  # Manually start session for keep alive (if supported by server, else, session is closed every time)
  http_session.start
  return http_session
end

Instance Method Details

#call(operation:, subpath: nil, query: nil, content_type: nil, body: nil, headers: nil, save_to_file: nil, exception: true, ret: :data) ⇒ Array(Hash, Net::HTTPResponse), ...

HTTP/S REST call

Parameters:

  • operation (String) —

    HTTP operation (GET, POST, PUT, DELETE)

  • subpath (String) (defaults to: nil) —

    subpath of REST API

  • query (Hash{String,Symbol => Object}) (defaults to: nil) —

    URL parameters

  • content_type (String, nil) (defaults to: nil) —

    Type of body parameters (one of MIME_*) and serialization, else use headers

  • body (Hash, String, nil) (defaults to: nil) —

    Body parameters

  • headers (Hash{String => String}) (defaults to: nil) —

    Additional headers (override Content-Type)

  • save_to_file (String, nil) (defaults to: nil) —

    File path to save response body

  • exception (Boolean) (defaults to: true) —

    Whether to raise an exception on HTTP error

  • ret (Symbol) (defaults to: :data) —

    One of :data, :resp, :both — controls return value

Returns:

  • (Array(Hash, Net::HTTPResponse)) —

    When ‘ret` is :both

  • (Net::HTTPResponse) —

    When ‘ret` is :resp

  • (Hash) —

    When ‘ret` is :data

Raises:



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# File 'lib/aspera/rest.rb', line 329

def call(
  operation:,
  subpath: nil,
  query: nil,
  content_type: nil,
  body: nil,
  headers: nil,
  save_to_file: nil,
  exception: true,
  ret: :data
)
  subpath = subpath.to_s if subpath.is_a?(Symbol)
  subpath = '' if subpath.nil?
  Log.log.debug{"call #{operation} [#{subpath}]".red.bold.bg_green}
  Log.dump(:body, body, level: :trace1)
  Log.dump(:query, query, level: :trace1)
  Log.dump(:headers, headers, level: :trace1)
  Aspera.assert_type(subpath, String)
  # We must have a way to check return code
  Aspera.assert(exception || !ret.eql?(:data))
  if headers.nil?
    headers = @headers.clone
  else
    h = headers
    headers = @headers.clone
    headers.merge!(h)
  end
  Aspera.assert_type(headers, Hash)
  case @auth_params[:type]
  when :none
    # no auth
  when :basic
    Log.log.debug('using Basic auth')
    # done in build_req
  when :oauth2
    headers['Authorization'] = oauth.authorization unless headers.key?('Authorization')
  when :url
    query ||= {}
    @auth_params[:url_query].each do |key, value|
      query[key] = value
    end
  else Aspera.error_unexpected_value(@auth_params[:type])
  end
  result_http = nil
  result_data = nil
  # start a block to be able to retry the actual HTTP request in case of OAuth token expiration
  begin
    # TODO: shall we percent encode subpath (spaces) test with access key delete with space in id
    # URI.escape()
    separator = ['', '/'].include?(subpath) ? '' : '/'
    uri = self.class.build_uri("#{@base_url}#{separator}#{subpath}", query)
    Log.log.debug{"URI=#{uri}"}
    begin
      # instantiate request object based on string name
      req = Net::HTTP.const_get(operation.capitalize).new(uri)
    rescue NameError
      raise "unsupported operation : #{operation}"
    end
    case content_type
    when nil # ignore
    when Mime::JSON
      req.body = JSON.generate(body) # , ascii_only: true
      req['Content-Type'] = Mime::JSON
    when Mime::WWW
      req.body = URI.encode_www_form(body)
      req['Content-Type'] = Mime::WWW
    when Mime::TEXT
      req.body = body
      req['Content-Type'] = Mime::TEXT
    else Aspera.error_unexpected_value(content_type){'body type'}
    end
    # set headers
    headers.each do |key, value|
      req[key] = value
    end
    # :type = :basic
    req.basic_auth(@auth_params[:username], @auth_params[:password]) if @auth_params[:type].eql?(:basic)
    Log.dump(:req_body, req.body, level: :trace1)
    # we try the call, and will retry on some error types
    error_tries ||= 1 + RestParameters.instance.retry_max
    # initialize with number of initial retries allowed, nil gives zero
    tries_remain_redirect = @redirect_max if tries_remain_redirect.nil?
    Log.log.debug("send request (retries=#{tries_remain_redirect})")
    result_mime = nil
    file_saved = false
    # make http request (pipelined)
    http_session.request(req) do |response|
      result_http = response
      result_mime = self.class.parse_header(result_http['Content-Type'] || Mime::TEXT)[:type]
      Log.log.debug{"response: code=#{result_http.code}, mime=#{result_mime}, content-type=#{response['Content-Type']}"}
      # JSON data needs to be parsed, in case it contains an error code
      if !save_to_file.nil? &&
          result_http.code.to_s.start_with?('2') &&
          !Mime.json?(result_mime)
        total_size = result_http['Content-Length']&.to_i
        Log.log.debug('before write file')
        target_file = save_to_file
        # override user's path to path in header
        if !response['Content-Disposition'].nil?
          disposition = self.class.parse_header(response['Content-Disposition'])
          target_file = File.join(File.dirname(target_file), disposition[:parameters][:filename]) if disposition[:parameters].key?(:filename) && !disposition[:parameters][:filename].eql?('.')
        end
        # download with temp filename
        target_file_tmp = "#{target_file}#{RestParameters.instance.download_partial_suffix}"
        Log.log.debug{"saving to: #{target_file}"}
        written_size = 0
        session_id = SecureRandom.uuid.freeze
        RestParameters.instance.progress_bar&.event(:session_start, session_id: session_id)
        RestParameters.instance.progress_bar&.event(:session_size, session_id: session_id, info: total_size) if total_size
        FileUtils.mkdir_p(File.dirname(target_file_tmp))
        limiter = TimerLimiter.new(0.5)
        File.open(target_file_tmp, 'wb') do |file|
          result_http.read_body do |fragment|
            file.write(fragment)
            written_size += fragment.length
            RestParameters.instance.progress_bar&.event(:transfer, session_id: session_id, info: written_size) if limiter.trigger?
          end
        end
        RestParameters.instance.progress_bar&.event(:session_end, session_id: session_id)
        RestParameters.instance.progress_bar&.event(:end)
        # rename at the end
        File.rename(target_file_tmp, target_file)
        file_saved = true
      end
    end
    Log.log.debug{"result: code=#{result_http.code} mime=#{result_mime}"}
    # sometimes there is a UTF8 char (e.g. © )
    # TODO : related to mime type encoding ?
    # result_http.body.force_encoding('UTF-8') if result_http.body.is_a?(String)
    # Log.log.debug{"result: body=#{result_http.body}"}
    result_data = result_http.body
    Log.dump(:result_data_raw, result_data, level: :trace1)
    result_data = JSON.parse(result_data) if Mime.json?(result_mime) && !result_data.nil? && !result_data.empty?
    Log.dump(:result_data, result_data)
    RestErrorAnalyzer.instance.raise_on_error(req, result_data, result_http)
    unless file_saved || save_to_file.nil?
      FileUtils.mkdir_p(File.dirname(save_to_file))
      File.write(save_to_file, result_http.body, binmode: true)
    end
  rescue RestCallError => e
    do_retry = false
    # AoC have some timeout , like Connect to platform.bss.asperasoft.com:443 ...
    do_retry ||= true if e.response.body.include?('failed: connect timed out') && RestParameters.instance.retry_on_timeout
    # AoC sometimes not available
    do_retry ||= true if RestParameters.instance.retry_on_unavailable && UNAVAILABLE_CODES.include?(result_http.code.to_s)
    # possibility to retry anything if it fails
    do_retry ||= true if RestParameters.instance.retry_on_error
    # not authorized: oauth token expired
    if @not_auth_codes.include?(result_http.code.to_s) && @auth_params[:type].eql?(:oauth2)
      begin
        # try to use refresh token
        req['Authorization'] = oauth.authorization(refresh: true)
      rescue RestCallError => e_tok
        e = e_tok
        Log.log.error('refresh failed'.bg_red)
        # regenerate a brand new token
        req['Authorization'] = oauth.authorization(cache: false)
      end
      Log.log.debug{"using new token=#{headers['Authorization']}"}
      do_retry ||= true
    end
    if do_retry && (error_tries -= 1).positive?
      sleep(RestParameters.instance.retry_sleep) unless RestParameters.instance.retry_sleep.eql?(0)
      retry
    end
    # redirect ? (any code beginning with 3)
    if e.response.is_a?(Net::HTTPRedirection) && tries_remain_redirect.positive?
      tries_remain_redirect -= 1
      current_uri = URI.parse(@base_url)
      new_url = e.response['Location']
      # special case: relative redirect
      if URI.parse(new_url).host.nil?
        # we don't manage relative redirects with non-absolute path
        Aspera.assert(new_url.start_with?('/')){"redirect location is relative: #{new_url}, but does not start with /."}
        new_url = "#{current_uri.scheme}://#{current_uri.host}#{new_url}"
      end
      # forwards the request to the new location
      return self.class.new(
        base_url: new_url,
        redirect_max: tries_remain_redirect
      ).call(
        operation: operation,
        subpath: new_url.end_with?('/') ? '/' : nil,
        query: query,
        body: body,
        content_type: content_type,
        save_to_file: save_to_file,
        exception: exception,
        headers: headers,
        ret: ret
      )
    end
    # raise exception if could not retry and not return error in result
    raise e if exception
  end
  Log.log.debug{"result=http:#{result_http}, data:#{result_data.class}"}
  return case ret
         when :data then result_data
         when :resp then result_http
         when :both then [result_data, result_http]
         else Aspera.error_unexpected_value(ret){'Type of result for REST'}
         end
end

#cancel(subpath, **kwargs) ⇒ Object

Cancel: ‘CANCEL`



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# File 'lib/aspera/rest.rb', line 569

def cancel(subpath, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  return call(operation: 'CANCEL', subpath: subpath, **kwargs)
end

#create(subpath, params, **kwargs) ⇒ Object

Create: ‘POST`



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# File 'lib/aspera/rest.rb', line 539

def create(subpath, params, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  kwargs[:content_type] = Mime::JSON unless kwargs.key?(:content_type)
  return call(operation: 'POST', subpath: subpath, body: params, **kwargs)
end

#delete(subpath, params = nil, **kwargs) ⇒ Object

Delete: ‘DELETE`



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# File 'lib/aspera/rest.rb', line 562

def delete(subpath, params = nil, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  return call(operation: 'DELETE', subpath: subpath, query: params, **kwargs)
end

#lookup_by_name(subpath, search_name, query: nil) ⇒ Object

Query entity by general search (read with parameter ‘q`) TODO: not generic enough ? move somewhere ? inheritance ?

Parameters:

  • subpath (String) —

    Path of entity in API

  • search_name (String) —

    Name of searched entity

  • query (Hash) (defaults to: nil) —

    Additional search query parameters



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# File 'lib/aspera/rest.rb', line 581

def lookup_by_name(subpath, search_name, query: nil)
  query = {} if query.nil?
  # returns entities matching the query (it matches against several fields in case insensitive way)
  matching_items = read(subpath, query.merge({'q' => search_name}))
  # API style: {totalcount:, ...} cspell: disable-line
  matching_items = matching_items[subpath] if matching_items.is_a?(Hash)
  Aspera.assert_type(matching_items, Array)
  case matching_items.length
  when 1 then return matching_items.first
  when 0 then raise EntityNotFound, %Q{No such #{subpath}: "#{search_name}"}
  else
    # multiple case insensitive partial matches, try case insensitive full match
    # (anyway AoC does not allow creation of 2 entities with same case insensitive name)
    name_matches = matching_items.select{ |i| i['name'].casecmp?(search_name)}
    case name_matches.length
    when 1 then return name_matches.first
    when 0 then raise %Q(#{subpath}: Multiple case insensitive partial match for: "#{search_name}": #{matching_items.map{ |i| i['name']}} but no case insensitive full match. Please be more specific or give exact name.)
    else raise "Two entities cannot have the same case insensitive name: #{name_matches.map{ |i| i['name']}}"
    end
  end
end

#oauth ⇒ Object

Returns the OAuth object (create, or cached if already created).

Returns:

  • the OAuth object (create, or cached if already created)



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# File 'lib/aspera/rest.rb', line 305

def oauth
  if @oauth.nil?
    Aspera.assert(@auth_params[:type].eql?(:oauth2)){'no OAuth defined'}
    oauth_parameters = @auth_params.reject{ |k, _v| k.eql?(:type)}
    Log.dump(:oauth_parameters, oauth_parameters)
    @oauth = OAuth::Factory.instance.create(**oauth_parameters)
  end
  return @oauth
end

#params ⇒ Object

Returns creation parameters.

Returns:

  • creation parameters



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# File 'lib/aspera/rest.rb', line 250

def params
  return {
    base_url:       @base_url,       # String
    auth:           @auth_params,    # Hash
    not_auth_codes: @not_auth_codes, # Array
    redirect_max:   @redirect_max,   # Integer
    headers:        @headers         # Hash
  }
end

#read(subpath, query = nil, **kwargs) ⇒ Object

Read: ‘GET`



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# File 'lib/aspera/rest.rb', line 547

def read(subpath, query = nil, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  return call(operation: 'GET', subpath: subpath, query: query, **kwargs)
end

#update(subpath, params, **kwargs) ⇒ Object

Update: ‘PUT`



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# File 'lib/aspera/rest.rb', line 554

def update(subpath, params, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  kwargs[:content_type] = Mime::JSON unless kwargs.key?(:content_type)
  return call(operation: 'PUT', subpath: subpath, body: params, **kwargs)
end