Variety works with restricted user permissions + tests

test/pom.xml

@@ -16,7 +16,7 @@
         <dependency>
             <groupId>org.mongodb</groupId>
             <artifactId>mongo-java-driver</artifactId>
-            <version>2.12.3</version>
+            <version>2.12.4</version>
         </dependency>
 
         <dependency>

test/src/main/java/com/github/variety/Credentials.java

+package com.github.variety;
+
+import com.mongodb.BasicDBObjectBuilder;
+import com.mongodb.DBObject;
+import com.mongodb.MongoCredential;
+import com.mongodb.util.JSON;
+
+/**
+ * MongoDB access credentials for admin/root with unrestricted access and for user with read only database test
+ */
+public enum Credentials {
+    ADMIN("admin", "variety_test_admin", "admin", "['userAdminAnyDatabase', 'readWriteAnyDatabase', 'dbAdminAnyDatabase']"),
+    USER("test", "variety_test_user", "test", "['read']");
+
+    /**
+     * Name of database, where auth objects are stored.
+     */
+    public static final String AUTH_DATABASE_NAME = "admin";
+
+    private final String authDatabase;
+    private final String username;
+    private final String password;
+    private final String rolesJson;
+
+    Credentials(final String authDatabase, final String username, final String password, final String rolesJson) {
+        this.authDatabase = authDatabase;
+        this.username = username;
+        this.password = password;
+        this.rolesJson = rolesJson;
+    }
+
+    public String getAuthDatabase() {
+        return authDatabase;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    /**
+     * @return Auth credentials for MongoDB Java driver.
+     */
+    public MongoCredential getMongoCredential() {
+        return MongoCredential.createMongoCRCredential(getUsername(), getAuthDatabase(), getPassword().toCharArray());
+    }
+
+    /**
+     * Convert username, password and roles to MongoDB document for user creation
+     * @return json document to be passed to createUser (mongodb version >=2.6.x) / addUser function(mongodb 2.4.x)
+     */
+    public DBObject getUserDocument() {
+        return new BasicDBObjectBuilder()
+                .add("user", username)
+                .add("pwd", password)
+                .add("roles", JSON.parse(this.rolesJson))
+                .get();
+    }
+}

test/src/main/java/com/github/variety/MongoShell.java

+package com.github.variety;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.StringJoiner;
+
+public class MongoShell {
+
+    private final boolean quiet;
+    private final Credentials credentials;
+    private final String eval;
+    private final String database;
+    private final String script;
+
+    public MongoShell(final String database, final Credentials credentials, final String eval, final String script, final boolean quiet) {
+        this.quiet = quiet;
+        this.credentials = credentials;
+        this.eval = eval;
+        this.database = database;
+        this.script = script;
+    }
+
+    public String execute() throws IOException, InterruptedException {
+        final List<String> commands = new ArrayList<>();
+        commands.add("mongo");
+        if (database != null && !database.isEmpty()) {
+            commands.add(this.database);
+        }
+        if (quiet) {
+            commands.add("--quiet");
+        }
+
+        if (credentials != null) {
+            commands.add("--username");
+            commands.add(credentials.getUsername());
+            commands.add("--password");
+            commands.add(credentials.getPassword());
+            commands.add("--authenticationDatabase");
+            commands.add(credentials.getAuthDatabase());
+        }
+
+        if (eval != null && !eval.isEmpty()) {
+            commands.add("--eval");
+            commands.add(eval);
+        }
+
+        if (script != null && !script.isEmpty()) {
+            commands.add(script);
+        }
+
+        final String[] cmdarray = commands.toArray(new String[commands.size()]);
+        final Process child = Runtime.getRuntime().exec(cmdarray);
+
+        final int returnCode = child.waitFor();
+        final String stdOut = readStream(child.getInputStream());
+
+        if (returnCode != 0) {
+            throw new RuntimeException("Failed to execute MongoDB shell with arguments: " + Arrays.toString(cmdarray) + ".\n" + stdOut);
+        }
+        return stdOut;
+    }
+
+    /**
+     * Converts input stream to String containing lines separated by \n
+     */
+    private String readStream(final InputStream stream) {
+        final BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8));
+        final StringJoiner builder = new StringJoiner("\n");
+        reader.lines().forEach(builder::add);
+        return builder.toString();
+    }
+}

test/src/main/java/com/github/variety/Variety.java

@@ -6,17 +6,12 @@ import com.github.variety.validator.ResultsValidator;
 import com.mongodb.DB;
 import com.mongodb.DBCollection;
 import com.mongodb.MongoClient;
+import com.mongodb.ServerAddress;
 
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.net.UnknownHostException;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Paths;
-import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.List;
 import java.util.StringJoiner;
 
 /**
@@ -42,6 +37,8 @@ public class Variety {
     private final String inputCollection;
     private final MongoClient mongoClient;
 
+    private final Credentials credentials;
+
     private Integer limit;
     private Integer maxDepth;
     private String query;
@@ -57,9 +54,19 @@ public class Variety {
      * @throws UnknownHostException Thrown when fails connection do default host and port of MongoDB
      */
     public Variety(final String database, final String collection) throws UnknownHostException {
-        this.inputDatabase = database;
-        this.inputCollection = collection;
+        this(database, collection, null);
+    }
+
+    public Variety(final String inputDatabase, final String inputCollection, final Credentials credentials) throws UnknownHostException {
+        this.inputDatabase = inputDatabase;
+        this.inputCollection = inputCollection;
+        this.credentials = credentials;
+
+        if (credentials == null) {
             this.mongoClient = new MongoClient();
+        } else {
+            this.mongoClient = new MongoClient(new ServerAddress("localhost"), Arrays.asList(credentials.getMongoCredential()));
+        }
     }
 
     /**
@@ -138,28 +145,11 @@ public class Variety {
      * Executes mongo shell with configured variety options and variety.js script in path.
      * @return Stdout of variety.js
      */
-    private String runAnalysis() throws IOException, InterruptedException {
-        final List<String> commands = new ArrayList<>();
-        commands.add("mongo");
-        commands.add(this.inputDatabase);
-        if(quiet) {
-            commands.add("--quiet");
-        }
-        commands.add("--eval");
-        commands.add(buildParams());
-        commands.add(getVarietyPath());
-
-        final String[] cmdarray = commands.toArray(new String[commands.size()]);
-        final Process child = Runtime.getRuntime().exec(cmdarray);
-
-        final int returnCode = child.waitFor();
-        final String stdOut = readStream(child.getInputStream());
-
-        if(returnCode != 0) {
-            throw new RuntimeException("Failed to execute variety.js with arguments: " + Arrays.toString(cmdarray) + ".\n" + stdOut);
-        }
-        System.out.println(stdOut);
-        return stdOut;
+    public String runAnalysis() throws IOException, InterruptedException {
+        final MongoShell mongoShell = new MongoShell(inputDatabase, credentials, buildParams(), getVarietyPath(), quiet);
+        final String result = mongoShell.execute();
+        System.out.println(result);
+        return result;
     }
 
     public ResultsValidator runJsonAnalysis() throws IOException, InterruptedException {
@@ -214,13 +204,5 @@ public class Variety {
         return Paths.get(this.getClass().getResource("/").getFile()).getParent().getParent().getParent().resolve("variety.js").toString();
     }
 
-    /**
-     * Converts input stream to String containing lines separated by \n
-     */
-    private String readStream(final InputStream stream)  {
-        final BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8));
-        final StringJoiner builder = new StringJoiner("\n");
-        reader.lines().forEach(builder::add);
-        return builder.toString();
-    }
+
 }

test/src/test/java/com/github/variety/test/LimitedAccessTest.java

+package com.github.variety.test;
+
+import com.github.variety.Credentials;
+import com.github.variety.MongoShell;
+import com.github.variety.Variety;
+import com.github.variety.validator.ResultsValidator;
+import com.mongodb.MongoClient;
+import com.mongodb.ServerAddress;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Tests, if variety can return results for user with read only access to analyzed database (without permission to list
+ * all other dbs / collections, without permission to persist results).
+ */
+public class LimitedAccessTest {
+
+    private Variety variety;
+    private MongoClient adminConnection;
+
+    @Before
+    public void setUp() throws Exception {
+
+        // create admin user (expects empty users table => no auth used for this connection)
+        createUser(null, Credentials.ADMIN);
+
+        // create limited user
+        createUser(Credentials.ADMIN, Credentials.USER);
+
+        // connect with admin credentials
+        adminConnection = new MongoClient(new ServerAddress("localhost"), Arrays.asList(Credentials.ADMIN.getMongoCredential()));
+
+        // create sample collection (logged admin user, writes to test DB)
+        adminConnection.getDB("test").getCollection("users").insert(SampleData.getDocuments());
+
+        // initialize variety with limited user credentials, connects to test/users collection
+        variety = new Variety("test", "users", Credentials.USER);
+    }
+
+    private void createUser(final Credentials loginCredentials, final Credentials userToCreate) throws IOException, InterruptedException {
+        final MongoShell shell = new MongoShell(userToCreate.getAuthDatabase(), loginCredentials, "db.addUser(" + userToCreate.getUserDocument() + ")", null, false);
+       System.out.println(shell.execute());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        adminConnection.getDB("test").getCollection("users").drop();
+
+        // remove both users from admin (auth) database. Caution, order is important - first delete user, then admin
+        System.out.println(new MongoShell("test", Credentials.ADMIN, "db.removeUser('" + Credentials.USER.getUsername() + "')", null, false).execute());
+        System.out.println(new MongoShell("admin", Credentials.ADMIN, "db.removeUser('" + Credentials.ADMIN.getUsername() + "')", null, false).execute());
+    }
+
+    /**
+     * Validate correct results read from JSON standard output, limited user connection provided
+     */
+    @Test
+    public void verifyBasicResultsJson() throws Exception {
+        validate(variety.runJsonAnalysis());
+    }
+
+    @Test
+    public void verifyBasicResultsAscii() throws Exception {
+        final String stdout = variety.withPersistResults(false).withQuiet(true).runAnalysis();
+        Assert.assertEquals(SampleData.EXPECTED_DATA_ASCII_TABLE, stdout);
+    }
+
+
+    @Test
+    public void testNotFoundDatabaseForAdmin() throws Exception {
+        final Variety adminVariety = new Variety("foo", "users", Credentials.ADMIN);
+        try {
+            adminVariety.runAnalysis();
+            Assert.fail("Should throw exception");
+        } catch (final Exception e) {
+            System.out.println(e);
+            final String messageVersion24 = "The collection specified (users) in the database specified (foo) does not exist or is empty";
+            final String messageVersion26 = "The database specified (foo) does not exist";
+            Assert.assertTrue(e.getMessage().contains(messageVersion24) || e.getMessage().contains(messageVersion26));
+        }
+    }
+
+    @Test
+    public void testNotFoundCollectionForAdmin() throws Exception {
+        final Variety adminVariety = new Variety("test", "bar", Credentials.ADMIN);
+        try {
+            adminVariety.runAnalysis();
+            Assert.fail("Should throw exception");
+        } catch (final Exception e) {
+            Assert.assertTrue(e.getMessage().contains("The collection specified (bar) in the database specified (test) does not exist or is empty."));
+            Assert.assertTrue(e.getMessage().contains("Possible collection options for database specified:"));
+        }
+    }
+
+    @Test
+    public void testNotFoundCollectionForUser() throws Exception {
+        final Variety adminVariety = new Variety("test", "bar", Credentials.USER);
+        try {
+            adminVariety.runAnalysis();
+            Assert.fail("Should throw exception");
+        } catch (final Exception e) {
+            Assert.assertTrue(e.getMessage().contains("The collection specified (bar) in the database specified (test) does not exist or is empty."));
+            Assert.assertTrue(e.getMessage().contains("Possible collection options for database specified:"));
+        }
+    }
+
+    @Test
+    public void testNotFoundDbForUser() throws Exception {
+        final Variety adminVariety = new Variety("foo", "users", Credentials.USER);
+        try {
+            adminVariety.runAnalysis();
+            Assert.fail("Should throw exception");
+        } catch (final Exception e) {
+            Assert.assertTrue("Exception should contain info about not authorized access, full message is: '" + e.getMessage() + "'", e.getMessage().contains("not authorized"));
+        }
+    }
+
+    private void validate(final ResultsValidator analysis) {
+        analysis.validate("_id", 5, 100, "ObjectId");
+        analysis.validate("name", 5, 100, "String");
+        analysis.validate("bio", 3, 60, "String");
+        analysis.validate("pets", 2, 40, "String", "Array");
+        analysis.validate("someBinData", 1, 20, "BinData-old");
+        analysis.validate("someWeirdLegacyKey", 1, 20, "String");
+    }
+}

variety.js

@@ -25,24 +25,26 @@ if (typeof db_name === 'string') {
   db = db.getMongo().getDB( db_name );
 }
 
-
-db.adminCommand('listDatabases').databases.forEach(function(d){
+var knownDatabases = db.adminCommand('listDatabases').databases;
+if(typeof knownDatabases !== 'undefined') { // not authorized user receives error response (json) without databases key
+  knownDatabases.forEach(function(d){
     if(db.getSisterDB(d.name).getCollectionNames().length > 0) {
       dbs.push(d.name);
     }
     if(db.getSisterDB(d.name).getCollectionNames().length === 0) {
       emptyDbs.push(d.name);
     }
-});
+  });
 
-if (emptyDbs.indexOf(db.getName()) !== -1) {
+  if (emptyDbs.indexOf(db.getName()) !== -1) {
     throw 'The database specified ('+ db +') is empty.\n'+
           'Possible database options are: ' + dbs.join(', ') + '.';
-}
+  }
 
-if (dbs.indexOf(db.getName()) === -1) {
+  if (dbs.indexOf(db.getName()) === -1) {
     throw 'The database specified ('+ db +') does not exist.\n'+
           'Possible database options are: ' + dbs.join(', ') + '.';
+  }
 }
 
 var collNames = db.getCollectionNames().join(', ');