(PowerShell) Firebase GET - Reading Data

Demonstrates how to read parts of a Firebase JSON database. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# Demonstrates how to read parts of a Firebase JSON database.

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# This example assumes a JWT authentication token, if required, has been previously obtained.
# See Get Firebase Access Token from JSON Service Account Private Key for sample code.

# Load the previously obtained Firebase access token into a string.
$fac = New-Object Chilkat.FileAccess
$accessToken = $fac.ReadEntireTextFile("qa_data/tokens/firebaseToken.txt","utf-8")
if ($fac.LastMethodSuccess -ne $true) {
    $($fac.LastErrorText)
    exit
}

$rest = New-Object Chilkat.Rest

# Make the initial connection (without sending a request yet).
# Once connected, any number of requests may be sent.  It is not necessary to explicitly
# call Connect before each request.  
$success = $rest.Connect("chilkat.firebaseio.com",443,$true,$true)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

# If authentication is required...
$authGoogle = New-Object Chilkat.AuthGoogle
$authGoogle.AccessToken = $accessToken
$rest.SetAuthGoogle($authGoogle)

# Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json

# Let's get the animals with the shallow parameter so we can see how many pigs exist.
$jsonResponse = $rest.FullRequestNoBody("GET","/pig-rescue/animal.json?shallow=true")
if ($rest.LastMethodSuccess -ne $true) {
    $($rest.LastErrorText)
    exit
}

# The JSON returned should look like this:  
# {"-KI3bD-FU_Dake7sYOiP":true,"-KI3bD-FU_Dake7sYOiT":true,"-KI3bD-FU_Dake7sYOiS":true,"-KI3bD-FU_Dake7sYOiU":true,"-KI3bD-FU_Dake7sYOiV":true,"-KI3bD-FU_Dake7sYOiR":true,"-KI3bD-FU_Dake7sYOiQ":true}
$($jsonResponse)

# Parse the response so we can iterate over each pig in the database..
$piggyPath = New-Object Chilkat.StringBuilder
$shallow = New-Object Chilkat.JsonObject
$piggyData = New-Object Chilkat.JsonObject
$shallow.Load($jsonResponse)
$count = $shallow.Size
$i = 0
while ($i -lt $count) {

    # Get each individual pig's data.
    $piggyPath.Clear()
    $piggyPath.Append("/pig-rescue/animal/")
    $piggyPath.Append($shallow.NameAt($i))
    $piggyPath.Append("/.json")

    $piggyJson = $rest.FullRequestNoBody("GET",$piggyPath.GetAsString())
    if ($rest.LastMethodSuccess -ne $true) {
        $($rest.LastErrorText)
        exit
    }

    # Show this piggy's data...
    # An example of one pig's data is shown here:
    # {"birth":"February, 1998","from":"Middle Ave.","gender":"F","in-date":"January, 2000",
    #   "name":"Molly II","picture":{"caption":"Molly in the Pasture","description":"Black pig","file":"molly_th.jpg"},
    #   "species":"pot belly pig","type":"Cathy's Herd"}
    $("---- " + $i + " ----")
    $($piggyJson)

    # Let's get the pig's name, and the caption of the picture.
    $piggyData.Load($piggyJson)
    $("name: " + $piggyData.StringOf("name"))
    $("caption: " + $piggyData.StringOf("picture.caption"))

    $i = $i + 1
}

# Note: In many of the Chilkat examples, you may notice strange ways
# of doing something that should be simpler and shorter.  For example,
# building the piggyPath (above) could've been written differently,
# with some simple string concatenation.
# 
# The reason is that the Chilkat examples are written in a 
# proprietary "example code" scripting language,
# and then automatically generated to each of the different programming
# languages you see on example-code.com.  The code generation is
# limited in what it can do.  For example, string concatentation
# is not yet a feature of the "example code" scripting language (as of May 2016), 
# and therefore you won't see the use of a programming language's string
# concatentation operators in any example.  
#