Lua

Google Cloud Storage List Bucket Objects

See more Google Cloud Storage Examples

List the objects in a Google Cloud Storage bucket. Lua

local chilkat = require("chilkat")

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

-- This example uses a previously obtained access token having permission for the
-- scope "https://www.googleapis.com/auth/cloud-platform"

-- In this example, Get Google Cloud Storage OAuth2 Access Token,
-- the service account access token was saved to a text file.  This example fetches the access token from the file..
local sbToken = chilkat.StringBuilder.new()
sbToken:load_file("qa_data/tokens/googleCloudStorageAccessToken.txt", "utf-8")

local http = chilkat.Http.new()
http.auth_token = sbToken:get_as_string()

-- For more info see Cloud Storage Documentation - Objects: list 
--
local success = http:set_url_var("bucket", "chilkat-ocean")
success = http:set_url_var("PROJECT_NAME", "ChilkatCloud")

local resp = chilkat.HttpResponse.new()
success = http:http_no_body("GET", "https://www.googleapis.com/storage/v1/b/{$bucket}/o?project={$ChilkatCloud}", resp)
if not success then
    print(http.last_error_text)
    return
end

local responseCode = resp.status_code
if responseCode == 401 then
    print(resp.body_str)
    print("If invalid credentials, then it is likely the access token expired.")
    print("Your app should automatically fetch a new access token and re-try.")
    return
end

print("Response code: " .. responseCode)
print("Response body")

local json = chilkat.JsonObject.new()
success = json:load(resp.body_str)

json.emit_compact = false

print(json:emit())

-- A response code = 200 indicates success, and the response body contains JSON such as this:

-- {
--   "kind": "storage#objects",
--   "items": [
--     {
--       "kind": "storage#object",
--       "id": "chilkat-ocean/file with space char.jpg/1555776690752366",
--       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg",
--       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg?generation=1555776690752366&alt=media",
--       "name": "file with space char.jpg",
--       "bucket": "chilkat-ocean",
--       "generation": "1555776690752366",
--       "metageneration": "1",
--       "contentType": "image/jpeg",
--       "storageClass": "MULTI_REGIONAL",
--       "size": "6229",
--       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
--       "crc32c": "9RjgwQ==",
--       "etag": "CO6WguiH3+ECEAE=",
--       "timeCreated": "2019-04-20T16:11:30.752Z",
--       "updated": "2019-04-20T16:11:30.752Z",
--       "timeStorageClassUpdated": "2019-04-20T16:11:30.752Z"
--     },
--     {
--       "kind": "storage#object",
--
--       "id": "chilkat-ocean/penguins.jpg/1555775749593296",
--       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/penguins.jpg",
--       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/penguins.jpg?generation=1555775749593296&alt=media",
--       "name": "penguins.jpg",
--       "bucket": "chilkat-ocean",
--       "generation": "1555775749593296",
--       "metageneration": "1",
--       "contentType": "image/jpeg",
--       "storageClass": "MULTI_REGIONAL",
--       "size": "777835",
--       "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
--       "crc32c": "ixxYVw==",
--       "etag": "CNCxnqeE3+ECEAE=",
--       "timeCreated": "2019-04-20T15:55:49.593Z",
--       "updated": "2019-04-20T15:55:49.593Z",
--       "timeStorageClassUpdated": "2019-04-20T15:55:49.593Z"
--     },
--     {
--       "kind": "storage#object",
--       "id": "chilkat-ocean/starfish.jpg/1628958192639968",
--       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
--       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1628958192639968&alt=media",
--       "name": "starfish.jpg",
--       "bucket": "chilkat-ocean",
--       "generation": "1628958192639968",
--       "metageneration": "1",
--       "contentType": "image/jpeg",
--       "storageClass": "MULTI_REGIONAL",
--       "size": "6229",
--       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
--       "crc32c": "9RjgwQ==",
--       "etag": "COC/tJP2sPICEAE=",
--       "timeCreated": "2021-08-14T16:23:12.660Z",
--       "updated": "2021-08-14T16:23:12.660Z",
--       "timeStorageClassUpdated": "2021-08-14T16:23:12.660Z"
--     }
--   ]
-- }

-- Use this online tool to generate parsing code from sample JSON:
-- Generate Parsing Code from JSON

local id = ""
local selfLink = ""
local mediaLink = ""
local name = ""
local bucket = ""
local generation = ""
local metageneration = ""
local contentType = ""
local storageClass = ""
local size = ""
local md5Hash = ""
local crc32c = ""
local etag = ""
local timeCreated = ""
local updated = ""
local timeStorageClassUpdated = ""

local kind = json:string_of("kind")
local i = 0
local count_i = json:size_of_array("items")
while i < count_i do
    json.i = i
    kind = json:string_of("items[i].kind")
    id = json:string_of("items[i].id")
    selfLink = json:string_of("items[i].selfLink")
    mediaLink = json:string_of("items[i].mediaLink")
    name = json:string_of("items[i].name")
    bucket = json:string_of("items[i].bucket")
    generation = json:string_of("items[i].generation")
    metageneration = json:string_of("items[i].metageneration")
    contentType = json:string_of("items[i].contentType")
    storageClass = json:string_of("items[i].storageClass")
    size = json:string_of("items[i].size")
    md5Hash = json:string_of("items[i].md5Hash")
    crc32c = json:string_of("items[i].crc32c")
    etag = json:string_of("items[i].etag")
    timeCreated = json:string_of("items[i].timeCreated")
    updated = json:string_of("items[i].updated")
    timeStorageClassUpdated = json:string_of("items[i].timeStorageClassUpdated")
    i = i + 1
end