# module OpenURI::OpenRead

Mixin for HTTP and FTP URIs.

### Public Instance Methods

open(*rest, &block) click to toggle source

#open provides `open' for URI::HTTP and URI::FTP.

#open takes optional 3 arguments as:

    OpenURI::OpenRead#open([mode [, perm]] [, options]) [{|io| ... }]

#open returns an IO-like object if block is not given. Otherwise it yields the IO object and return the value of the block. The IO object is extended with OpenURI::Meta.

`mode` and `perm` are the same as Kernel#open.

However, `mode` must be read mode because #open doesn't support write mode (yet). Also `perm` is ignored because it is meaningful only for file creation.

`options` must be a hash.

Each option with a string key specifies an extra header field for HTTP. I.e., it is ignored for FTP without HTTP proxy.

The hash may include other options, where keys are symbols:

:proxy

  Synopsis:

      :proxy => "http://proxy.foo.com:8000/"
      :proxy => URI.parse("http://proxy.foo.com:8000/")
      :proxy => true
      :proxy => false
      :proxy => nil

  If :proxy option is specified, the value should be String, URI, boolean or nil.

  When String or URI is given, it is treated as proxy URI.

  When true is given or the option itself is not specified, environment variable `scheme_proxy' is examined. `scheme' is replaced by `http', `https' or `ftp'.

  When false or nil is given, the environment variables are ignored and connection will be made to a server directly.

:proxy_http_basic_authentication

  Synopsis:

      :proxy_http_basic_authentication =>
        ["http://proxy.foo.com:8000/", "proxy-user", "proxy-password"]
      :proxy_http_basic_authentication =>
        [URI.parse("http://proxy.foo.com:8000/"),
         "proxy-user", "proxy-password"]

  If :proxy option is specified, the value should be an Array with 3 elements. It should contain a proxy URI, a proxy user name and a proxy password. The proxy URI should be a String, an URI or nil. The proxy user name and password should be a String.

  If nil is given for the proxy URI, this option is just ignored.

  If :proxy and :proxy_http_basic_authentication is specified, ArgumentError is raised.

:http_basic_authentication

  Synopsis:

      :http_basic_authentication=>[user, password]

  If :http_basic_authentication is specified, the value should be an array which contains 2 strings: username and password. It is used for HTTP Basic authentication defined by RFC 2617.

:content_length_proc

  Synopsis:

      :content_length_proc => lambda {|content_length| ... }

  If :content_length_proc option is specified, the option value procedure is called before actual transfer is started. It takes one argument, which is expected content length in bytes.

  If two or more transfers are performed by HTTP redirection, the procedure is called only once for the last transfer.

  When expected content length is unknown, the procedure is called with nil. This happens when the HTTP response has no Content-Length header.

:progress_proc

  Synopsis:

      :progress_proc => lambda {|size| ...}

  If :progress_proc option is specified, the proc is called with one argument each time when `open' gets content fragment from network. The argument `size` is the accumulated transferred size in bytes.

  If two or more transfer is done by HTTP redirection, the procedure is called only one for a last transfer.

  :progress_proc and :content_length_proc are intended to be used for progress bar. For example, it can be implemented as follows using Ruby/ProgressBar.

      pbar = nil
      open("http://...",
        :content_length_proc => lambda {|t|
          if t && 0 < t
            pbar = ProgressBar.new("...", t)
            pbar.file_transfer_mode
          end
        },
        :progress_proc => lambda {|s|
          pbar.set s if pbar
        }) {|f| ... }

:read_timeout

  Synopsis:

      :read_timeout=>nil     (no timeout)
      :read_timeout=>10      (10 second)

  :read_timeout option specifies a timeout of read for http connections.

:open_timeout

  Synopsis:

      :open_timeout=>nil     (no timeout)
      :open_timeout=>10      (10 second)

  :open_timeout option specifies a timeout of open for http connections.

:ssl_ca_cert

  Synopsis:

      :ssl_ca_cert=>filename or an Array of filenames

  :ssl_ca_cert is used to specify CA certificate for SSL. If it is given, default certificates are not used.

:ssl_verify_mode

  Synopsis:

      :ssl_verify_mode=>mode

  :ssl_verify_mode is used to specify openssl verify mode.

:ftp_active_mode

  Synopsis:

      :ftp_active_mode=>bool

  `:ftp_active_mode => true` is used to make ftp active mode. Ruby 1.9 uses passive mode by default. Note that the active mode is default in Ruby 1.8 or prior.

:redirect

  Synopsis:

      :redirect=>bool

  `:redirect` is true by default. `:redirect => false` is used to disable all HTTP redirects.

  OpenURI::HTTPRedirect exception raised on redirection. Using `true` also means that redirections between http and ftp are permitted.

    # File lib/open-uri.rb, line 733
    def open(*rest, &block)
      OpenURI.open_uri(self, *rest, &block)
    end

read(options={}) click to toggle source

#read) reads a content referenced by self and returns the content as string. The string is extended with OpenURI::Meta. The argument `options` is same as #open.

    # File lib/open-uri.rb, line 741
    def read(options={})
      self.open(options) {|f|
        str = f.read
        Meta.init str, f
        str
      }
    end