Authorizations Code

Accumulo Tour: Authorizations Code

Tour page 7 of 12

Below is a solution for the exercise.

static void exercise(AccumuloClient client) throws Exception {
    // create a table called "GothamPD".
    client.tableOperations().create("GothamPD");

    // Create a "secretId" authorization & visibility
    final String secretId = "secretId";
    Authorizations auths = new Authorizations(secretId);
    ColumnVisibility colVis = new ColumnVisibility(secretId);

    // Create a user with the "secretId" authorization and grant him read permissions on our table
    client.securityOperations().createLocalUser("commissioner", new PasswordToken("gordonrocks"));
    client.securityOperations().changeUserAuthorizations("commissioner", auths);
    client.securityOperations().grantTablePermission("commissioner", "GothamPD", TablePermission.READ);

    // Create 3 Mutation objects, securing the proper columns.
    Mutation mutation1 = new Mutation("id0001");
    mutation1.put("hero", "alias", "Batman");
    mutation1.put("hero", "name", colVis, "Bruce Wayne");
    mutation1.put("hero", "wearsCape?", "true");
    Mutation mutation2 = new Mutation("id0002");
    mutation2.put("hero", "alias", "Robin");
    mutation2.put("hero", "name", colVis, "Dick Grayson");
    mutation2.put("hero", "wearsCape?", "true");
    Mutation mutation3 = new Mutation("id0003");
    mutation3.put("villain", "alias", "Joker");
    mutation3.put("villain", "name", "Unknown");
    mutation3.put("villain", "wearsCape?", "false");

    // Create a BatchWriter to the GothamPD table and add your mutations to it.
    // Once the BatchWriter is closed by the try w/ resources, data will be available to scans.
    try (BatchWriter writer = client.createBatchWriter("GothamPD")) {
        writer.addMutation(mutation1);
        writer.addMutation(mutation2);
        writer.addMutation(mutation3);
    }

    // Create a second client for the commissioner. Then print all the rows visibile to the
    // commissioner. Make sure to pass the proper authorizations to the Scanner
    try (AccumuloClient commishClient = Accumulo.newClient().from(client.properties())
            .as("commissioner", "gordonrocks").build();
        Scanner scan = commishClient.createScanner("GothamPD", auths)) {
        System.out.println("Gotham Police Department Persons of Interest:");
        for (Map.Entry<Key, Value> entry : scan) {
            System.out.printf("Key : %-60s  Value : %s\n", entry.getKey(), entry.getValue());
        }
    }
}

The solution above will print (timestamp will differ):

Gotham Police Department Persons of Interest:
Key : id0001 hero:alias [] 1511900180231 false                      Value : Batman
Key : id0001 hero:name [secretId] 1511900180231 false               Value : Bruce Wayne
Key : id0001 hero:wearsCape? [] 1511900180231 false                 Value : true
Key : id0002 hero:alias [] 1511900180231 false                      Value : Robin
Key : id0002 hero:name [secretId] 1511900180231 false               Value : Dick Grayson
Key : id0002 hero:wearsCape? [] 1511900180231 false                 Value : true
Key : id0003 villain:alias [] 1511900180231 false                   Value : Joker
Key : id0003 villain:name [] 1511900180231 false                    Value : Unknown
Key : id0003 villain:wearsCape? [] 1511900180231 false              Value : false

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