Provided by: tcllib_1.15-dfsg-2_all 
NAME
rest - define REST web APIs and call them inline or asychronously
SYNOPSIS
package require Tcl 8.5
package require rest ?1.0?
::rest::simple url query ?config? ?body?
::rest::get url query ?config? ?body?
::rest::post url query ?config? ?body?
::rest::head url query ?config? ?body?
::rest::put url query ?config? ?body?
::rest::delete url query ?config? ?body?
::rest::save name file
::rest::describe name
::rest::parameters url ?args?
::rest::parse_opts static required optional string
::rest::substitute string ?var?
::rest::create_interface name
describe
uplevel token token
upvar body body
uplevel token token
uplevel token token
_________________________________________________________________
DESCRIPTION
There are 2 types of usage this package supports: simple calls, and complete interfaces. In an interface
you specify a set of rules and then the package builds commands which correspond to the REST methods.
These commands can have many options such as input and output transformations and data type specific
formatting. This results in a cleaner and simpler script. On the other hand, a simple call is easier and
quicker to implement but less featureful. It takes the url and a few options on the command and returns
the result directly. Any formatting or checking is up to rest of the script. Simple usage In simple
usage you make calls using http method procedures and then check or process the returned data yourself
::rest::simple url query ?config? ?body?
::rest::get url query ?config? ?body?
::rest::post url query ?config? ?body?
::rest::head url query ?config? ?body?
::rest::put url query ?config? ?body?
::rest::delete url query ?config? ?body?
The above commands are all equivalent except for the http method used. If you use simple then the method
should be specified as an option in the ?config? dict, otherwise it defaults to get. If a body is needed
then the config dict must be present, however it may be empty.
set appid APPID
set search tcl
set res [rest::get http://boss.yahooapis.com/ysearch/web/v1/$search [list appid $appid]]
set res [rest::format_json $res]
set res [rest::simple http://twitter.com/statuses/update.json [list status $text] {
method post
auth {basic user password}
format json
}
]
the options supported in the config dict are as follows headers cookie auth format method content-type
Interface usage An interface to a REST API consists of a series of definitions of REST calls contained in
an array. The array name becomes a namespace containing the defined commands. Each array element defines
the name of the call and takes the form of a dict, aka key/value pairs. These keys are the defined
configuration options below. After creating the definitions simply call rest::create_interface on the
array to create the commands.
package require rest
set yweather(forecast) {
url http://weather.yahooapis.com/forecastrss
req_args { p: }
opt_args { u: }
}
rest::create_interface yweather
puts [yweather::forecast -p 94089]
::${name}::basic_auth u p ::${name}::set_static_args ?args?]
::rest::save name file
saves a copy of the dynamically created procs to a file for later loading
::rest::describe name
print a description of defined api calls
::rest::parameters url ?args?
parse a url query string into a dict
::rest::parse_opts static required optional string
::rest::substitute string ?var?
take a string and substitute real values for any option identifiers
::rest::create_interface name
TOKENS the value is substituted into the url at call time. tokens in the form of
%name:default_value% will be an optional argument with a default value. url the target of the
http request description a string which describes the call. used only for
describe
body indicates if arguments are required for the request body or not. should be one of none,
optional, required, argument or mime_multipart. default is optional. if argument is used then the
option is parsed as a list where the second value is the name of a option. the body will then be
used as the value for that option. if the value is mime_multipart then the body is required and
interpreted as each argument representing one part of a mime multipart document. each argument
should be a 2 item list with the first being a list of header keys and values, and the second
being the mime part body.
set ygeo(parse) {
url http://wherein.yahooapis.com/v1/document
method post
body { arg documentContent }
}
ygeo::parse "san jose ca"
# "san jose ca" will be interpreted as if it were specified as the -documentContent option
set gdocs(upload) {
url http://docs.google.com/feeds/default/private/full
body mime_multipart
}
gdocs::upload [list {Content-Type application/atom+xml} $xml] [list {Content-Type image/jpeg} $filedata]
method The HTTP method to call on the url. The default is GET. copy this copies the definition of
a previously defined call. after copying you can override selected options by defining them again.
unset removes the named option. useful when using copy of another definition. headers the value
must be another dict containing header fields and their values. The default is to not add any
additional headers. content-type Specifies the content type for the request data. req_args a
list of the required arguments. names ending in a colon will require a value. opt_args arguments
that may be present but are not required. static_args arguments that are always the same. no
sense in troubling the user with these. A leading - is allowed but not required to maintain
consistancy with the command line. auth should be one of basic or sign. if basic is used you can
configure basic auth with the proc auth_basic which takes 2 arguments, the username and password.
if sign is specified then the value must be a list with the second element being the name of a
proc which will be called to perform the request signing.
set delicious(updated) {
url https://api.del.icio.us/v1/posts/update
auth basic
}
rest::create_interface flickr
flickr::basic_auth username password
set flickr(auth.getToken) {
url http://api.flickr.com/services/rest/
req_args { api_key: secret: }
auth { sign do_signature }
}
rest::create_interface flickr
proc ::flickr::do_signature {query} {
# perform some operations on the query here
return $query
}
callback If this option is present then the method will be created as an async call. An async call
will return immediately with the value of the http token. The event loop must be active to use
this option. The value of this option is the name of a proc which is invoked when the HTTP call is
complete. The proc receives three arguments, the name of the calling procedure, the status of the
result (one of OK or ERROR), and the data associated with the result. the http request header is
available via
uplevel token token
cookie a list of cookies to be passed in the http header. this is just a shortcut to the headers
option input_transform commands which take the variable $query and transform it in some manner
before returning a new value. return value must be a dict which will be passed to
http::formatQuery the request body is accessible via
upvar body body
format or result defines the format of the returned data. should be one of discard, raw, json,
xml, or tdom. the default is auto which should auto detect between xml and json. rss is formated
as a special case of xml. pre_transform this value takes the form of a proc which should perform
some action on $result and return a value. it is run on the result before the output
(xml/json/etc) transformation is done. the http request header is available via
uplevel token token
result may have the value xml, json, tdom, raw, or auto. the default is auto and should auto
detect json or xml results and transform them into a tcl list. this is here if you want to specify
it explicitly. post_transform this value takes the form of a proc which should perform some
action on $result and return a value. it is run on the result after the output transformation but
before returning the value to the calling procedure. the http request header is available via
uplevel token token
check_result this value should be a list of 2 expressions either of which may be empty. the first
expression is checks the OK condition, it must return true when the result is satisfactory. the
second expression is the error condition, it must return false unless there is an error.
INCLUDED
functional but incomplete implementations are included for the following services: flickr twitter yahoo
boss yahoo weather google calendar facebook del.icio.us read the file or source it and use describe for
more information. also see the developers documentation on the respective sites.