Git: Add a method to generate the SSH keys

android/app/build.gradle

@@ -51,6 +51,9 @@ dependencies {
 
     // https://mvnrepository.com/artifact/org.eclipse.jgit/org.eclipse.jgit
     implementation group: 'org.eclipse.jgit', name: 'org.eclipse.jgit', version: '4.4.1.201607150455-r'
+
+    // For reading a file to string
+    implementation 'commons-io:commons-io:2.5'
 }
 
 configurations {

android/app/src/main/java/com/example/journal/GenerateSSHKeysTask.java

@@ -0,0 +1,70 @@
+package com.example.journal;
+
+import android.os.AsyncTask;
+import android.util.Log;
+
+import com.jcraft.jsch.*;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+
+import org.apache.commons.io.FileUtils;
+
+import io.flutter.plugin.common.MethodChannel.Result;
+
+public class GenerateSSHKeysTask extends AsyncTask<String, Void, Void> {
+    private Result result;
+
+    public GenerateSSHKeysTask(Result _result) {
+        result = _result;
+    }
+
+    protected Void doInBackground(String... params) {
+        String keysDirPath = params[0];
+        File keysDir = new File(keysDirPath);
+        if (!keysDir.exists()) {
+            keysDir.mkdir();
+        }
+
+        final String privateKeyPath = keysDir + "/id_rsa";
+        final String publicKeyPath = keysDir + "/id_rsa.pub";
+
+        File privateKeyFile = new File(privateKeyPath);
+        if (privateKeyFile.exists()) {
+            Log.d("GenerateSSHKeys", "Private key already exists");
+            result.error("FAILED", "Private key already exists", null);
+            return null;
+        }
+
+        // Generate key pair
+        try {
+            JSch jsch = new JSch();
+            KeyPair kpair = KeyPair.genKeyPair(jsch, KeyPair.RSA, 1024 * 4);
+
+            kpair.writePrivateKey(privateKeyPath);
+            kpair.writePublicKey(publicKeyPath, "Auto generated Key");
+            kpair.dispose();
+        } catch (JSchException ex) {
+            Log.d("GenerateSSHKeys", ex.toString());
+            result.error("FAILED", ex.toString(), null);
+            return null;
+        } catch (IOException ex) {
+            Log.d("GenerateSSHKeys", ex.toString());
+            result.error("FAILED", ex.toString(), null);
+            return null;
+        }
+
+        String publicKey;
+        try {
+            publicKey = FileUtils.readFileToString(new File(publicKeyPath), Charset.defaultCharset());
+        } catch (IOException ex) {
+            Log.d("GenerateSSHKeys", ex.toString());
+            result.error("FAILED", "Failed to read the public key", null);
+            return null;
+        }
+
+        result.success(publicKey);
+        return null;
+    }
+}

android/app/src/main/java/com/example/journal/MainActivity.java

@@ -21,7 +21,7 @@ import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.GitAPIException;
 
 public class MainActivity extends FlutterActivity {
-  private static final String CHANNEL = "samples.flutter.io/battery";
+  private static final String CHANNEL = "gitjournal.io/git";
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
@@ -56,93 +56,17 @@ public class MainActivity extends FlutterActivity {
             return;
           }
 
-          result.notImplemented();
+          if (call.method.equals("generateSSHKeys")) {
+            String appFilesDir = PathUtils.getFilesDir(getApplicationContext());
+            String sshKeysLocation = appFilesDir + "/ssh";
 
-          // Methods to add
-          // git clone
-          // git pull - merge by taking newest
-          // git add
-          // git commit
-          // git push
+            new GenerateSSHKeysTask(result).execute(sshKeysLocation);
+            return;
+          }
+
+          result.notImplemented();
         }
       });
   }
 
-  private boolean gitClone(String url, String filePath) {
-    // TODO: Progress
-    // TODO: Credentials
-    // TODO: Handle errors!
-
-    File directory = new File("/git");
-
-    try {
-      Git git = Git.cloneRepository()
-              .setURI(url)
-              .setDirectory(directory)
-              .call();
-      return true;
-    }
-    catch (GitAPIException e) {
-      System.err.println("Error Cloning repository " + url + " : "+ e.getMessage());
-      return false;
-    }
-  }
-
-  /*
-  private void gitAdd(String gitRootUrl, String gitFileUrl) {
-    File directory = new File(gitRootUrl);
-
-    try {
-      Git git = Git.open(directory);
-
-      git.add()
-        .addFilepattern(gitFileUrl)
-        .call();
-    }
-    catch (GitAPIException e) {
-      System.err.println("Error Cloning repository " + url + " : "+ e.getMessage());
-    }
-    catch (java.io.IOException e) {
-      System.err.println("Error Opening GitRepo " + gitRootUrl + " : "+ e.getMessage());
-    }
-  }
-
-  private void gitRemove(String gitRootUrl, String gitFileUrl) {
-    File directory = new File(gitRootUrl);
-
-    try {
-      Git git = Git.open(directory);
-
-      git.rm()
-        .addFilepattern(gitFileUrl)
-        .call();
-    }
-    catch (GitAPIException e) {
-      System.err.println("Error Cloning repository " + url + " : "+ e.getMessage());
-    }
-    catch (java.io.IOException e) {
-      System.err.println("Error Opening GitRepo " + gitRootUrl + " : "+ e.getMessage());
-    }
-  }
-
-  private void gitCommit(String gitRootUrl, String message) {
-    File directory = new File(gitRootUrl);
-
-    try {
-      Git git = Git.open(directory);
-
-      git.commit()
-        .setAuthor("JournalApp", "none@example.com")
-        .setMessage(message)
-        .call();
-    }
-    catch (GitAPIException e) {
-      System.err.println("Error Cloning repository " + url + " : "+ e.getMessage());
-    }
-    catch (java.io.IOException e) {
-      System.err.println("Error Opening GitRepo " + gitRootUrl + " : "+ e.getMessage());
-    }
-  }
-  */
-
 }

lib/gitapp.dart

@@ -21,9 +21,9 @@ class GitApp extends StatelessWidget {
 buildGitButtons() {
   return <Widget>[
     RaisedButton(
-      child: Text("Remove Directory"),
-      onPressed: () {
-        print("FOO");
+      child: Text("Generate Keys"),
+      onPressed: () async {
+        await generateSSHKeys();
       },
     ),
     RaisedButton(
@@ -42,7 +42,7 @@ buildGitButtons() {
 }
 
 Future gitClone() async {
-  const platform = const MethodChannel('samples.flutter.io/battery');
+  const platform = const MethodChannel('gitjournal.io/git');
 
   print("Going to git clone");
   await platform.invokeMethod('gitClone', {
@@ -51,3 +51,16 @@ Future gitClone() async {
   });
   print("FOO");
 }
+
+Future generateSSHKeys() async {
+  print("generateSSHKeys");
+  try {
+    const platform = const MethodChannel('gitjournal.io/git');
+    String publicKey = await platform.invokeMethod('generateSSHKeys', {});
+    print("Public Key " + publicKey);
+  } on PlatformException catch (e) {
+    print("Failed to generateSSHKeys: '${e.message}'.");
+  } catch (e) {
+    print("EX: '${e.message}'.");
+  }
+}