Advanced topics in touchdevelop cloud services access to everything over the web Disclaimer: This...

advanced topics in touchdevelop

cloud servicesaccess to everything over the web

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what it iso “meta API”

• retrieve all information visible in touchdevelop app

• outlook: callbacks, plugins (meta apps)

o build on web standards• HTTP, REST, JSON

✿ touchdevelop.com/help/cloudservices


architectureo front-ends

• TouchDevelop WP7 app talks with Azure Web Service

• (any) browser talks with Azure Web App

o Windows Identity Foundation• allows users to authenticate with Windows Live ID, Facebook

o Azure• web site talks with Azure Web Service

• web service controls Azure Storage

• storage (public data)

• storage (private data)


AzureStorage (public)

AzureWeb

Service

AzureWeb Site

Windows Identity

Foundation

AzureStorage (private)

WP7 devices withTouchDevelop app

web browser


HTTPo HyperText Transfer Protocol o the protocol used by the World Wide

Web


HTTP exampleo Request Headers

• GET http://www.touchdevelop.com/api/ecvs HTTP/1.1 • Host: www.touchdevelop.com • Cache-Control: max-age=0 • Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

• Accept-Encoding: gzip,deflate,sdch

o Response Headers• HTTP/1.1 200 OK • Content-Length: 451 • Expires: -1 Date: Fri, 10 Feb 2012 02:51:48 GMT • Content-Type: application/json; charset=utf-8 • Cache-Control: no-cache, no-store • Pragma: no-cache


RESTo REST (Representational State Transfer) is a

lightweight alternative to mechanisms like RPC (Remote Procedure Calls) and Web Services (SOAP, WSDL, et al.).

o RESTful applications use HTTP requests to post data (create and/or update), read data (e.g., make queries), and delete data. Thus, REST uses HTTP for all four CRUD (Create/Read/Update/Delete) operations.


REST hereo Currently, only supported verb is ‘GET’o All accesses are stateless


JSONo JSON (JavaScript Object Notation) is

a lightweight data-interchange format.

o two building blocks:• a collection of name/value pairs

(“object”, “record”, …)

• an ordered list of values (“array”, …)


JSON grammarjson: string | number | boolean |

array | object

string/number/boolean follow grammar of corresponding JavaScript literals

array: “[“ [json (“,” comma)*] “]”field: string “:” jsonobject: “[“ field [(“,” field)*] “]”

example

[ “elem0”, 1, { “x” : “value of field x”, “y” : 42 }, false]


JSON exampleo GET http://www.touchdevelop.com/api/ecvs HTTP/1.1

{ "kind":"script", "time":44139093, "id":"ezdf", "url":"http://touchdevelop.com/ezdf", "name":"Smart Rail Table", "description":"", "userid":"yvfc", "username":"Sascha M. B.", "icon":"directions", "iconbackground":"#008000", "iconurl":"https://az31353.vo.msecnd.net/c01/wbso.png", "positivereviews":0, "comments":0, …


JSON example

… "capabilities":[ {"name":"sourcegeolocation","iconurl":"https://az31353.vo.msecnd.net/c01/qzgl.png"}, {"name":"sinkweb","iconurl":"https://az31353.vo.msecnd.net/c01/mopx.png"} ], "flows":[], "haserrors":false, "rootid":"dgig", "updateid":"ezdf", "ishidden":false, "islibrary":false, "installations":0, "runs":0}


main listso /api/new-scriptso /api/top-scriptso /api/featured-scriptso /api/search?text=[text]o /api/userso /api/commentso /api/screenshotso /api/reviewso optional list parameters: ?

count=[number]&continuation=[token]


publication propertieso /api/[id]o /api/[scriptid]/texto /api/[scriptid]/asto /api/[scriptid]/successorso /api/[scriptid]/baseo /api/[userid]/scriptso /api/[scriptid or userid or commentid]/commentso /api/[scriptid or userid]/screenshots o /api/[commentid or scriptid or userid]/reviews o /api/[userid]/picture


apis: jsono Web→download json

Downloads a web service response as a JSON data structure

o Json Object→kindGets a json kind (string, number, boolean, object, array)

o string: Json Object→to stringo number: Json Object→to numbero boolean: Json Object→to booleano object: Json Object→keys, Json

Object→fieldo array: Json Object→at, Json Object→counto

https://www.touchdevelop.com/help/api/200050/web



http://www.touchdevelop.com/help/api/200050/Json%20Object





























exercise► in touchdevelop, write code that…• Posts the names of new scripts

• Posts links to the urls of new scripts

► in touchdevelop, write code that figures out…• of the (around) 100 new scripts,

which have at least one ♥ ?

☁ http://touchdevelop.com/axaw (solution)

http://touchdevelop.com/axaw

http://touchdevelop.com/axaw


homework► in your favorite language, write code that figures out…• how many scripts are there?

• how many AST nodes does the biggest script have?

• which script got the most ♥ ?

• which user gave the most ♥ ?

• what is the longest script (number of lines)?

• which script got updated the most?

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