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The SHELL adapter library is just intended to something you copy and rename and make it into a real adapter for a real system. It has all the boiler plate you need. I made it because I wanted to try to build a few adapters to Solve the calendar management problem.

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The shell adapter ships with Iguana just add the Shell Example - see Create a Component .

So how do we use it say Let’s use the Shell Adapter to create an Atlassian adapter .using the Atlassian APIs:

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titleThe Goal - A good adapter will have very little code and be easy for the user to extend

It’s better to have a simple ‘incomplete’ adapter that is easily understood and altered by the user than an over elaborate one.

Iguana X is a open system which is intended to allow our customers and do anything. Overly elaborate adapters means that the code is a what we call a Code dump which makes it difficult for other people to adapt and use the code to their own purposes.

This is problem with a lot of Open Source projects.

Sure you have access to the code but that isn’t helpful if it takes months of study to understand it and it the code has many many design flaws that you cannot solve without with years of commitment.

Less is more.

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titleis a library showing how to connect to a system

In IguanaX, an open system, we provide adapters as libraries to connect with various applications. These adapters are intentionally designed to be simple and intuitive, making them easily extendable by users to meet their specific needs. This approach contrasts with the complexity often found in open-source projects and the rigidness of complete platforms like Zapier. Iguana's inclusive environment, featuring a Translator, logging, queuing system, and dashboard, though convenient, requires users to invest effort in learning. Our goal is to empower users with adaptable tools, understanding that no adapter can be universally complete.

See:

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titleTypically we have an example component which just shows the usage of the library

The component aims to showcase the library's use, easing the learning process for users to integrate with systems efficiently. It's crafted to enable customers to quickly start without delving deep into documentation or seeking iNTERFACEWARE staff help. Therefore, it doesn't cover every detail of the problem but rather provides a clear direction, setting customers on their own path of exploration and discovery.

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titleAdapters will typically be created with the authentication parameters without hardcoded custom fields.

These parameters should not be hard coded into things like custom fields. This is because our customers may use these adapter libraries in components with others.

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titleOften we layer in a 'custom method' which has all the boiler plate code for an say a web API

For each adapter, we create a custom method to avoid the need for a lot of copy-pasted code. This method contains all the essential code for connecting to a web API, eliminating the repetition of the same code for different API methods. We have one main custom method, with other specific APIs serving as wrappers around it. If we need to access an API method for which we haven't created a specific wrapper, we can simply call this custom method, specify the API path, and provide any necessary parameters. This approach makes using new API methods straightforward and minimizes the need for additional setup.

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titleWe create a few specific method wrappers for calls that typically use the 'custom method'

Each specific call does not typically have much code because most of the 'boilerplate' code is in the custom method, and it's nice that each of these methods has help. Doing things this way should make it quite clear to a user how they can extend each adapter.

See Setting up help for an object with methods

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titleHave some general comments about the nature of the API

Comments should be concise and straightforward, guiding users on what to do next with the API. For example, in systems like Pipedrive where custom fields use GUIDs, good documentation would explain how to address this issue. The aim is to educate users, not overwhelm them by attempting to solve every problem.

Implementation Approach:

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titleSTEP 1: Start with a copy of new Custom component

Let’s use a copy of new Custom component (Create a Component ) and name it ‘Confluence adapter’

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titleSTEP 2: Import the SHELL library and associate it with a new repo

Let’s say git@bitbucket.org:interfaceware/atlassian ( - see Create a library

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titleSTEP 3: Rename the SHELL Library folder and all the files in it to a new prefix

For instanceRename the Library Folders and Files to use a new prefix. For example:

Image Modified
This gets
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titleSTEP 4: Search and replace SHELL for ATTL in the project
to replace all the prefixes in the scripts

Use Project Search and Replace to replace all the prefixes consistentused within scripts on all files in the project.

Add this project
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titleMake sure STEP 5: Provide the ATTLclient function gets all the parameters needed to authenticate
title
Code Block
languagelua
function ATTLclient(T)
   local S= {}
   setmetatable(S, MT)
   S.key = T.key
   return S
end

So in In the case of Atlassian we need:

  • user - I.e. fred.smith@interfaceware.com

  • space - i.e. ABC for a Confluence space that has this ID

  • key - A unique personal API key for a confluence user

  • organization - to construct base URL to our Confluence space, e.g. https://acme.atalassian.net

This adheres with Naming convention for table parameters in Iguana.

These should just be passed through in the table arguments. So the code becomes:

Code Block
languagelua
function ATTLclient(T)
   local S= {}
   setmetatable(S, MT)
   S.key           = T.key
   S.space         = T.space
   S.user          = T.user
   S.organization  = T.organization
   return S
end
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Now we need to add the API access key to

the project as a Custom Fields. The API access key needs to be treated as password. Thus we create in config.json a custom field named ‘key' of type 'Password’ and store in it the personal Atlassian API access key, respective to the user name in use.

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titleSTEP 6: Implement a good custom method

The custom method should do most is the guts of the adapter - handling most of the API call logic. Most web APIs have some magic sauce that you have to make an API call. The custom method does this and should make it easy to call methods on the API which have not been wrapped explicitly.

Let’s call our new Custom custom method ATTLdescendants. We can rename ATTLhello into ATTLdescendants and to rewrite its content.

This method will help us to invoke the API method ATTLgetDescendants.

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titleSTEP 7: Implement a good API method

Let’s call our new API method ATTLgetDescendants. We can rename ATTLcustom into ATTLgetDescendants and to rewrite its content.

This method will returns return all pages in a space.

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titleMore about API methods

Sometimes Now, sometimes an API method would require a parameter which can be discovered only programmatically. In our example of Confluence Adapter this is Confluence Space Id parameter, which isn’t the same as a Space Key above.

The API method ATTLgetSpaceId will help us to discover this value. Let’s create new Lua file, name it ATTLgetSpaceId and write its content.

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titleSTEP 8: Update the Client Constructor

Append to the Client’s meta table, the three newly added methods and the ‘space_id’ variable declaration.

Code Block
local MT={}

MT.__index = {}
MT.__index.descendants     = require 'ATTL.ATTLdescendants'
MT.__index.getSpaceId      = require 'ATTL.ATTLgetSpaceId'
MT.__index.getDescendants  = require 'ATTL.ATTLgetDescendants'

help.map{dir='ATTL/help',methods=MT.__index}

function ATTLclient(T)
   local S= {}
   setmetatable(S, MT)
   S.key           = T.key
   S.space         = T.space
   S.user          = T.user
   S.organization  = T.organization
   S.space_id      = T.space_id
   return S
end
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titleNot to forget the STEP 9: Create your own Help files!

Add Help files Files (*.help) to explain what parameters the methods expect. Other users will appreciate this!

image-20240319-153543.png
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titleTime to put all of this to good work.STEP 10: Call your methods in main.lua

Let’s create a simple main.lua file:

Code Block
require "ATTL.ATTLclient"

A = ATTLclient{
   key          = component.fields().key,
   space        = 'EC',
   user         = 'fred.smith@interfaceware.com',
   organization = 'interfaceware'
} 

function main(Data)
   A:getSpaceId() 
   local count = 2 
   A:descendants{count = count, live = true}
end
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titleHow does this main.lua works?

Right after declaration of Client instance and passing the parameters to it, we discover the Confluence Space ID. This value couldn’t be known without running this API call.

Next we prepare for paginated API call and require only 2 calls to be executed by setting ‘count’ variable to number 2. This will save the time while testing. The parameters for this method are described in respective help file.

And finally, we request from API to return the listing of descendants for 50 pages.

image-20240319-154423.png
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titleShare a little of 'what is next'?Continue adding methods to expand your adapter!

So, we can query Atlassian API for Confluence! What it is good for? We can query documents, we can edit documents, we can modify/export/add/delete content in any manner we imagine. The complete documentation for this API is available here.

Just create more API methods and more Custom methods.

Custom methods are very helpful to keep the API methods true to vendors API documentation. Custom methods will help to create your specific parameters combination, and to massage the responses. Custom methods are the interface, between your code to clean and true API methods.

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