(SQL Server) 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

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- 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
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbToken OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    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
    -- Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
    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
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbMetaData OUT

    DECLARE @success int
    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