Add an activity to write blog posts

Closes #411

briar-android/src/org/briarproject/android/blogs/WriteBlogPostActivity.java

@@ -0,0 +1,188 @@
+package org.briarproject.android.blogs;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.design.widget.TextInputEditText;
+import android.support.design.widget.TextInputLayout;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+import org.briarproject.R;
+import org.briarproject.android.ActivityComponent;
+import org.briarproject.android.BriarActivity;
+import org.briarproject.api.FormatException;
+import org.briarproject.api.blogs.BlogManager;
+import org.briarproject.api.blogs.BlogPost;
+import org.briarproject.api.blogs.BlogPostFactory;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.identity.IdentityManager;
+import org.briarproject.api.identity.LocalAuthor;
+import org.briarproject.api.sync.GroupId;
+import org.briarproject.util.StringUtils;
+
+import java.security.GeneralSecurityException;
+import java.util.Collection;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.api.blogs.BlogConstants.MAX_BLOG_POST_BODY_LENGTH;
+import static org.briarproject.api.blogs.BlogConstants.MAX_BLOG_POST_TITLE_LENGTH;
+
+public class WriteBlogPostActivity extends BriarActivity
+		implements OnEditorActionListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(WriteBlogPostActivity.class.getName());
+	private static final String contentType = "text/plain";
+
+	private TextInputEditText titleInput;
+	private EditText bodyInput;
+	private Button publishButton;
+	private ProgressBar progressBar;
+
+	// Fields that are accessed from background threads must be volatile
+	private volatile GroupId groupId;
+	@Inject
+	protected volatile IdentityManager identityManager;
+	@Inject
+	volatile BlogPostFactory blogPostFactory;
+	@Inject
+	volatile BlogManager blogManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra(GROUP_ID);
+		if (b == null) throw new IllegalStateException("No Group in intent.");
+		groupId = new GroupId(b);
+//		String blogName = i.getStringExtra(BLOG_NAME);
+//		if (blogName != null) setTitle(blogName);
+
+		setContentView(R.layout.activity_write_blog_post);
+//		String title =
+//				getTitle() + ": " + getString(R.string.blogs_write_blog_post);
+//		setTitle(title);
+
+		TextInputLayout titleLayout =
+				(TextInputLayout) findViewById(R.id.titleLayout);
+		if (titleLayout != null) {
+			titleLayout.setCounterMaxLength(MAX_BLOG_POST_TITLE_LENGTH);
+		}
+		titleInput = (TextInputEditText) findViewById(R.id.titleInput);
+		if (titleInput != null) {
+			titleInput.setOnEditorActionListener(this);
+		}
+
+		bodyInput = (EditText) findViewById(R.id.bodyInput);
+		bodyInput.addTextChangedListener(new TextWatcher() {
+			@Override
+			public void beforeTextChanged(CharSequence s, int start, int count,
+					int after) {
+			}
+
+			@Override
+			public void onTextChanged(CharSequence s, int start, int before,
+					int count) {
+			}
+
+			@Override
+			public void afterTextChanged(Editable s) {
+				showOrHidePublishButton();
+			}
+		});
+
+		publishButton = (Button) findViewById(R.id.publishButton);
+		publishButton.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				publish();
+			}
+		});
+
+		progressBar = (ProgressBar) findViewById(R.id.progressBar);
+	}
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public boolean onEditorAction(TextView textView, int actionId, KeyEvent e) {
+		bodyInput.requestFocus();
+		return true;
+	}
+
+	private void showOrHidePublishButton() {
+		int bodyLength =
+				StringUtils.toUtf8(bodyInput.getText().toString()).length;
+		if (bodyLength > 0 && bodyLength <= MAX_BLOG_POST_BODY_LENGTH &&
+				titleInput.getText().length() <= MAX_BLOG_POST_TITLE_LENGTH)
+			publishButton.setEnabled(true);
+		else
+			publishButton.setEnabled(false);
+	}
+
+	private void publish() {
+		// title
+		String title = titleInput.getText().toString();
+		if (title.length() > MAX_BLOG_POST_TITLE_LENGTH) return;
+		if (title.length() == 0) title = null;
+
+		// body
+		byte[] body = StringUtils.toUtf8(bodyInput.getText().toString());
+
+		// hide publish button, show progress bar
+		publishButton.setVisibility(GONE);
+		progressBar.setVisibility(VISIBLE);
+
+		storePost(title, body);
+	}
+
+	private void storePost(final String title, final byte[] body) {
+		runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				long now = System.currentTimeMillis();
+				try {
+					Collection<LocalAuthor> authors =
+							identityManager.getLocalAuthors();
+					LocalAuthor author = authors.iterator().next();
+					BlogPost p = blogPostFactory
+							.createBlogPost(groupId, title, now, null, author,
+									contentType, body);
+					blogManager.addLocalPost(p);
+					postPublished();
+				} catch (DbException | GeneralSecurityException | FormatException e) {
+					// TODO show error
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
+			}
+		});
+	}
+
+	private void postPublished() {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				setResult(RESULT_OK);
+				supportFinishAfterTransition();
+			}
+		});
+	}
+
+}