Lua

Get Firebase Access Token from JSON Service Account Private Key

See more Firebase Examples

Demonstrates how to get a Firebase access token using a JSON service account private key. Your Firebase service account can be used to authenticate multiple Firebase features, such as Database, Storage and Auth, programmatically.

A Firebase JSON service account private key can be created in the Firebase settings/admin portion of the console.firebase.google.com site as shown here:

Scroll down to see the example code...

Lua

local chilkat = require("chilkat")

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

-- First load the Firebase JSON private key into a string.
local fac = chilkat.FileAccess.new()
local jsonKey = fac:read_entire_text_file("qa_data/firebase/firebase-chilkat-firebase-adminsdk-n28n4-1b664ee163.json", "utf-8")
if not fac.last_method_success then
    print(fac.last_error_text)
    return
end

-- A Firebase JSON private key should look something like this:

-- {
--   "type": "service_account",
--   "project_id": "firebase-chilkat",
--   "private_key_id": "1c664ee164907413c91ddefcf5b765ecba8779e2",
--   "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvQIBA ... Ya2UZii/lXn73/ZOK8=\n-----END PRIVATE KEY-----\n",
--   "client_email": "firebase-adminsdk-n28n4@firebase-chilkat.iam.gserviceaccount.com",
--   "client_id": "134846322329335418431",
--   "auth_uri": "https://accounts.google.com/o/oauth2/auth",
--   "token_uri": "https://accounts.google.com/o/oauth2/token",
--   "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
--   "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-n28n4%40firebase-chilkat.iam.gserviceaccount.com"
-- }
--

local gAuth = chilkat.AuthGoogle.new()
gAuth.json_key = jsonKey

-- Choose a scope.
-- The scope could be "https://www.googleapis.com/auth/firebase.database"
-- or a space-delimited list of scopes:
-- "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email"

gAuth.scope = "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email"

-- Request an access token that is valid for this many seconds.
gAuth.expire_num_seconds = 3600

-- If the application is requesting delegated access:
-- The email address of the user for which the application is requesting delegated access,
-- then set the email address here. (Otherwise leave it empty.)
gAuth.sub_email_address = ""

-- Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
-- The Chilkat socket object is used so that the connection can be established
-- through proxies or an SSH tunnel if desired.
local tlsSock = chilkat.Socket.new()
local success = tlsSock:connect("www.googleapis.com", 443, true, 5000)
if not success then
    print(tlsSock.last_error_text)
    return
end

-- Send the request to obtain the access token.
success = gAuth:obtain_access_token(tlsSock)
if not success then
    print(gAuth.last_error_text)
    return
end

-- Examine the access token:
print("Firebase Access Token: " .. gAuth.access_token)

-- Save the token to a file (or wherever desired).  This token is valid for 1 hour.
fac:write_entire_text_file("qa_data/tokens/firebaseToken.txt", gAuth.access_token, "utf-8", false)