B4X

Google Cloud Storage List Bucket Objects

See more Google Cloud Storage Examples

List the objects in a Google Cloud Storage bucket. B4X

Dim success As Boolean = False

'  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..
Dim sbToken As ChilkatStringBuilder
sbToken.Initialize
sbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt", "utf-8")

Dim http As ChilkatHttp
http.Initialize("http")
http.AuthToken = sbToken.GetAsString

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

Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpNoBody("GET", "https://www.googleapis.com/storage/v1/b/{$bucket}/o?project={$ChilkatCloud}", resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Dim responseCode As Int = resp.StatusCode
If responseCode = 401 Then
    Log(resp.BodyStr)
    Log("If invalid credentials, then it is likely the access token expired.")
    Log("Your app should automatically fetch a new access token and re-try.")
    Return
End If


Log("Response code: " & responseCode)
Log("Response body")

Dim json As ChilkatJsonObject
json.Initialize
success = json.Load(resp.BodyStr)

json.EmitCompact = False

Log(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



Dim id As String
Dim selfLink As String
Dim mediaLink As String
Dim name As String
Dim bucket As String
Dim generation As String
Dim metageneration As String
Dim contentType As String
Dim storageClass As String
Dim size As String
Dim md5Hash As String
Dim crc32c As String
Dim etag As String
Dim timeCreated As String
Dim updated As String
Dim timeStorageClassUpdated As String

Dim kind As String = json.StringOf("kind")
Dim i As Int = 0
Dim count_i As Int = json.SizeOfArray("items")
Do While i < count_i
    json.I = i
    kind = json.StringOf("items[i].kind")
    id = json.StringOf("items[i].id")
    selfLink = json.StringOf("items[i].selfLink")
    mediaLink = json.StringOf("items[i].mediaLink")
    name = json.StringOf("items[i].name")
    bucket = json.StringOf("items[i].bucket")
    generation = json.StringOf("items[i].generation")
    metageneration = json.StringOf("items[i].metageneration")
    contentType = json.StringOf("items[i].contentType")
    storageClass = json.StringOf("items[i].storageClass")
    size = json.StringOf("items[i].size")
    md5Hash = json.StringOf("items[i].md5Hash")
    crc32c = json.StringOf("items[i].crc32c")
    etag = json.StringOf("items[i].etag")
    timeCreated = json.StringOf("items[i].timeCreated")
    updated = json.StringOf("items[i].updated")
    timeStorageClassUpdated = json.StringOf("items[i].timeStorageClassUpdated")
    i = i + 1
Loop