(DataFlex) Get Object MetaData from Google Cloud Storage

Demonstrates how to download a Google Cloud Storage object's metadata.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoSbToken
    Boolean iSuccess
    Handle hoHttp
    String sUrl
    Variant vSbMetaData
    Handle hoSbMetaData
    Boolean iSuccess
    Integer iResponseCode
    String sTemp1

    // 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..
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbToken
    If (Not(IsComObjectCreated(hoSbToken))) Begin
        Send CreateComObject of hoSbToken
    End
    Get ComLoadFile Of hoSbToken "qa_data/tokens/googleCloudStorageAccessToken.txt" "utf-8" To iSuccess

    // 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"

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Get ComGetAsString Of hoSbToken To sTemp1
    Set ComAuthToken Of hoHttp To sTemp1

    // Construct a URL to download the metadata for the object named "starfish.jpg" located in the "chilkat-ocean" bucket.
    Get ComSetUrlVar Of hoHttp "bucket_name" "chilkat-ocean" To iSuccess
    Get ComSetUrlVar Of hoHttp "object_name" "starfish.jpg" To iSuccess
    Move "https://www.googleapis.com/storage/v1/b/{$bucket_name}/o/{$object_name}?projection=full" To sUrl

    // If there is an error response, then we didn't actually download the metadata,
    // but instead we downloaded an error response..
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbMetaData
    If (Not(IsComObjectCreated(hoSbMetaData))) Begin
        Send CreateComObject of hoSbMetaData
    End
    Get pvComObject of hoSbMetaData to vSbMetaData
    Get ComDownloadSb Of hoHttp sUrl "utf-8" vSbMetaData To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComLastStatus Of hoHttp To iResponseCode
    If (iResponseCode = 401) Begin
        Showln "If invalid credentials, then it is likely the access token expired."
        Showln "Your app should automatically fetch a new access token and re-try."
    End

    If (iResponseCode <> 200) Begin
        Showln "Error response code = " iResponseCode
        Showln "Error:"
        Get ComGetAsString Of hoSbMetaData To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComGetAsString Of hoSbMetaData To sTemp1
    Showln sTemp1
    Showln "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="
    // }
    // 


End_Procedure