SQL Server
Get Object MetaData from Google Cloud Storage

Demonstrates how to download a Google Cloud Storage object's metadata.
Chilkat SQL Server Downloads

SQL Server
-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 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..
    DECLARE @sbToken int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbToken OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OAMethod @sbToken, 'LoadFile', @success OUT, '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"

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT

    EXEC sp_OAMethod @sbToken, 'GetAsString', @sTmp0 OUT
    EXEC sp_OASetProperty @http, 'AuthToken', @sTmp0

    --  Construct a URL to download the metadata for the object named "starfish.jpg" located in the "chilkat-ocean" bucket.
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'bucket_name', 'chilkat-ocean'
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'object_name', 'starfish.jpg'
    DECLARE @url nvarchar(4000)
    SELECT @url = '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..
    DECLARE @sbMetaData int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbMetaData OUT

    EXEC sp_OAMethod @http, 'DownloadSb', @success OUT, @url, 'utf-8', @sbMetaData
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbToken
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbMetaData
        RETURN
      END

    DECLARE @responseCode int
    EXEC sp_OAGetProperty @http, 'LastStatus', @responseCode OUT
    IF @responseCode = 401
      BEGIN

        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.'
      END

    IF @responseCode <> 200
      BEGIN

        PRINT 'Error response code = ' + @responseCode

        PRINT 'Error:'
        EXEC sp_OAMethod @sbMetaData, 'GetAsString', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbToken
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbMetaData
        RETURN
      END

    EXEC sp_OAMethod @sbMetaData, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    PRINT '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="
    --  }
    --  

    EXEC @hr = sp_OADestroy @sbToken
    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @sbMetaData


END
GO