PureBasic
PureBasic
Get Object MetaData from Google Cloud Storage
See more Google Cloud Storage Examples
Demonstrates how to download a Google Cloud Storage object's metadata.Chilkat PureBasic Downloads
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkHttp.pb"
Procedure ChilkatExample()
success.i = 0
; 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..
sbToken.i = CkStringBuilder::ckCreate()
If sbToken.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkStringBuilder::ckLoadFile(sbToken,"qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8")
; Send a GET equivalent to this curl command.
; curl -X GET \
; -H "Authorization: Bearer [OAUTH2_TOKEN]" \
; -o "[SAVE_TO_LOCATION]" \
; "https://www.googleapis.com/storage/v1/b/[BUCKET_NAME]/o/[OBJECT_NAME]?projection=full"
http.i = CkHttp::ckCreate()
If http.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkHttp::setCkAuthToken(http, CkStringBuilder::ckGetAsString(sbToken))
; Construct a URL to download the metadata for the object named "starfish.jpg" located in the "chilkat-ocean" bucket.
CkHttp::ckSetUrlVar(http,"bucket_name","chilkat-ocean")
CkHttp::ckSetUrlVar(http,"object_name","starfish.jpg")
url.s = "https://www.googleapis.com/storage/v1/b/{$bucket_name}/o/{$object_name}?projection=full"
; If there is an error response, then we didn't actually download the metadata,
; but instead we downloaded an error response..
sbMetaData.i = CkStringBuilder::ckCreate()
If sbMetaData.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
success = CkHttp::ckDownloadSb(http,url,"utf-8",sbMetaData)
If success = 0
Debug CkHttp::ckLastErrorText(http)
CkStringBuilder::ckDispose(sbToken)
CkHttp::ckDispose(http)
CkStringBuilder::ckDispose(sbMetaData)
ProcedureReturn
EndIf
responseCode.i = CkHttp::ckLastStatus(http)
If responseCode = 401
Debug "If invalid credentials, then it is likely the access token expired."
Debug "Your app should automatically fetch a new access token and re-try."
EndIf
If responseCode <> 200
Debug "Error response code = " + Str(responseCode)
Debug "Error:"
Debug CkStringBuilder::ckGetAsString(sbMetaData)
CkStringBuilder::ckDispose(sbToken)
CkHttp::ckDispose(http)
CkStringBuilder::ckDispose(sbMetaData)
ProcedureReturn
EndIf
Debug CkStringBuilder::ckGetAsString(sbMetaData)
Debug "Success."
; Sample output:
; {
; "kind": "storage#object",
; "id": "chilkat-ocean/starfish.jpg/1502670320090292",
; "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
; "name": "starfish.jpg",
; "bucket": "chilkat-ocean",
; "generation": "1502670320090292",
; "metageneration": "1",
; "contentType": "image/jpeg",
; "timeCreated": "2017-08-14T00:25:20.040Z",
; "updated": "2017-08-14T00:25:20.040Z",
; "storageClass": "MULTI_REGIONAL",
; "timeStorageClassUpdated": "2017-08-14T00:25:20.040Z",
; "size": "6229",
; "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
; "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1502670320090292&alt=media",
; "acl": [
; {
; "kind": "storage#objectAccessControl",
; "id": "chilkat-ocean/starfish.jpg/1502670320090292/project-owners-933037264567",
; "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg/acl/project-owners-933037264567",
; "bucket": "chilkat-ocean",
; "object": "starfish.jpg",
; "generation": "1502670320090292",
; "entity": "project-owners-933037264567",
; "role": "OWNER",
; "projectTeam": {
; "projectNumber": "933037264567",
; "team": "owners"
; },
; "etag": "CLT5kpW71dUCEAE="
; },
; {
; "kind": "storage#objectAccessControl",
; "id": "chilkat-ocean/starfish.jpg/1502670320090292/project-editors-933037264567",
; "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg/acl/project-editors-933037264567",
; "bucket": "chilkat-ocean",
; "object": "starfish.jpg",
; "generation": "1502670320090292",
; "entity": "project-editors-933037264567",
; "role": "OWNER",
; "projectTeam": {
; "projectNumber": "933037264567",
; "team": "editors"
; },
; "etag": "CLT5kpW71dUCEAE="
; },
; {
; "kind": "storage#objectAccessControl",
; "id": "chilkat-ocean/starfish.jpg/1502670320090292/project-viewers-933037264567",
; "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg/acl/project-viewers-933037264567",
; "bucket": "chilkat-ocean",
; "object": "starfish.jpg",
; "generation": "1502670320090292",
; "entity": "project-viewers-933037264567",
; "role": "READER",
; "projectTeam": {
; "projectNumber": "933037264567",
; "team": "viewers"
; },
; "etag": "CLT5kpW71dUCEAE="
; },
; {
; "kind": "storage#objectAccessControl",
; "id": "chilkat-ocean/starfish.jpg/1502670320090292/user-starfish@chilkat-176611.iam.gserviceaccount.com",
; "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg/acl/user-starfish@chilkat-176611.iam.gserviceaccount.com",
; "bucket": "chilkat-ocean",
; "object": "starfish.jpg",
; "generation": "1502670320090292",
; "entity": "user-starfish@chilkat-176611.iam.gserviceaccount.com",
; "role": "OWNER",
; "email": "starfish@chilkat-176611.iam.gserviceaccount.com",
; "etag": "CLT5kpW71dUCEAE="
; }
; ],
; "owner": {
; "entity": "user-starfish@chilkat-176611.iam.gserviceaccount.com"
; },
; "crc32c": "9RjgwQ==",
; "etag": "CLT5kpW71dUCEAE="
; }
;
CkStringBuilder::ckDispose(sbToken)
CkHttp::ckDispose(http)
CkStringBuilder::ckDispose(sbMetaData)
ProcedureReturn
EndProcedure