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(Unicode C) Get Object MetaData from Google Cloud StorageDemonstrates how to download a Google Cloud Storage object's metadata.
#include <C_CkStringBuilderW.h> #include <C_CkHttpW.h> void ChilkatSample(void) { HCkStringBuilderW sbToken; HCkHttpW http; const wchar_t *url; HCkStringBuilderW sbMetaData; BOOL success; int responseCode; // 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 = CkStringBuilderW_Create(); CkStringBuilderW_LoadFile(sbToken,L"qa_data/tokens/googleCloudStorageAccessToken.txt",L"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 = CkHttpW_Create(); CkHttpW_putAuthToken(http,CkStringBuilderW_getAsString(sbToken)); // Construct a URL to download the metadata for the object named "starfish.jpg" located in the "chilkat-ocean" bucket. CkHttpW_SetUrlVar(http,L"bucket_name",L"chilkat-ocean"); CkHttpW_SetUrlVar(http,L"object_name",L"starfish.jpg"); url = L"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 = CkStringBuilderW_Create(); success = CkHttpW_DownloadSb(http,url,L"utf-8",sbMetaData); if (success == FALSE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkStringBuilderW_Dispose(sbToken); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbMetaData); return; } responseCode = CkHttpW_getLastStatus(http); if (responseCode == 401) { wprintf(L"If invalid credentials, then it is likely the access token expired.\n"); wprintf(L"Your app should automatically fetch a new access token and re-try.\n"); } if (responseCode != 200) { wprintf(L"Error response code = %d\n",responseCode); wprintf(L"Error:\n"); wprintf(L"%s\n",CkStringBuilderW_getAsString(sbMetaData)); CkStringBuilderW_Dispose(sbToken); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbMetaData); return; } wprintf(L"%s\n",CkStringBuilderW_getAsString(sbMetaData)); wprintf(L"Success.\n"); // 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=" // } // CkStringBuilderW_Dispose(sbToken); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbMetaData); } |
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