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Powershell and the web

Powershell and the web. PowerShell Summit 2014 Trond Hindenes, Crayon AS (@ trondhindenes ). The IT Automation Pyramid. PowerShell Integration Maturity. Why step to the left?. Low quality vendor-supplied CmdLets Lack of functionality. Types of Web Services.

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Powershell and the web

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  1. Powershell and the web PowerShell Summit 2014 Trond Hindenes, Crayon AS (@trondhindenes)

  2. The IT Automation Pyramid

  3. PowerShell Integration Maturity

  4. Why step to the left? • Low quality vendor-supplied CmdLets • Lack of functionality

  5. Types of Web Services • Generation 1: XML Web Services (SOAP) • Stateful (or, acting like they are stateful) • Generation 2: RESTful services (JSON/XML) • Stateless • Good overview at:http://www.developingthefuture.net/web-services-overview/

  6. Types of Web Services (2) • SOAP: Access api through methods on the proxy object$citynames = $proxy.LatLonListCityNames(1) • REST: Each operation has a URL: • http://server/api/customers/fred/orders • HTTP DELETE to http://server/api/products/orange

  7. Authentication Gotcha’s • The life of a http request • Authentication types: • Unauthenticated or IP based • Basic/NTLM • Token based

  8. Visual Studio Lightswitch • Rapid development of Data-driven applications • Can be self-hosted or built as a Sharepoint 2013 “app” • The backend data is served using WCF OData

  9. Patterns for Lightswitch + PowerShell • Develop the app • Deploy it somewhere • Generate proxy dll • Use the proxy to interact with the serviceendpoint

  10. Examining the proxy dll • Use the VS Object Browser to inspect the dll • Or use Ilspy (http://ilspy.net/)

  11. PowerShell and RESTfulservices with JSON aka Invoke-Restmethod • JSON – Javascript Object Notation • “Human readable objects” • Similar to XML, but lighter weight (XML is wire-heavy)

  12. Rest Gotchas • Everything is a PsCustomObject • No “.gettype()” • Each request is atomic • No “state” • API examples often use curl • Important differences between PowerShell and curl (authentication) • Be mindful of JSON syntax • You'll often end up with lots of "nested" objects

  13. Generating “proper” objects • New-Struct to the rescue • (http://powershellcommunity.poshcode.org/3146)

  14. ASP.Net MVC/Web API • General-purpose web app framework for building “stuff” • Scott Guthrie’sbrainchild • Web API is a flexible framework for building (among others) RESTful web services • Natively supports both JSON and xml

  15. Case: Hosted mail flow monitoring

  16. Fun with web • SpamTitan (super-simple XML/Rest) • Geckoboard (complex json) • PagerDuty (simple json)

  17. Thank you!

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