332 lines
14 KiB
Java
332 lines
14 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email.mail;
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import com.android.email.Email;
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import com.android.email.R;
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import com.android.emailcommon.Logging;
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import com.android.emailcommon.mail.Folder;
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import com.android.emailcommon.mail.MessagingException;
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import com.android.emailcommon.provider.EmailContent.Account;
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import com.android.emailcommon.provider.EmailContent.HostAuth;
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import com.android.emailcommon.utility.Utility;
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import com.google.common.annotations.VisibleForTesting;
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import org.xmlpull.v1.XmlPullParserException;
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import android.content.Context;
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import android.content.res.XmlResourceParser;
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import android.os.Bundle;
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import android.text.TextUtils;
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import android.util.Log;
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import java.io.IOException;
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import java.util.HashMap;
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/**
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* Store is the access point for an email message store. It's location can be
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* local or remote and no specific protocol is defined. Store is intended to
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* loosely model in combination the JavaMail classes javax.mail.Store and
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* javax.mail.Folder along with some additional functionality to improve
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* performance on mobile devices. Implementations of this class should focus on
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* making as few network connections as possible.
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*/
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public abstract class Store {
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/**
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* String constants for known store schemes.
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*/
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public static final String STORE_SCHEME_IMAP = "imap";
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public static final String STORE_SCHEME_POP3 = "pop3";
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public static final String STORE_SCHEME_EAS = "eas";
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public static final String STORE_SCHEME_LOCAL = "local";
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public static final String STORE_SECURITY_SSL = "+ssl";
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public static final String STORE_SECURITY_TLS = "+tls";
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public static final String STORE_SECURITY_TRUST_CERTIFICATES = "+trustallcerts";
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/**
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* A global suggestion to Store implementors on how much of the body
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* should be returned on FetchProfile.Item.BODY_SANE requests.
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*/
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public static final int FETCH_BODY_SANE_SUGGESTED_SIZE = (50 * 1024);
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@VisibleForTesting
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static final HashMap<String, Store> sStores = new HashMap<String, Store>();
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/**
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* Static named constructor. It should be overrode by extending class.
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* Because this method will be called through reflection, it can not be protected.
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*/
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public static Store newInstance(Account account, Context context,
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PersistentDataCallbacks callbacks) throws MessagingException {
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throw new MessagingException("Store#newInstance: Unknown scheme in "
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+ account.mDisplayName);
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}
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private static Store instantiateStore(String className, Account account, Context context,
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PersistentDataCallbacks callbacks)
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throws MessagingException {
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Object o = null;
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try {
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Class<?> c = Class.forName(className);
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// and invoke "newInstance" class method and instantiate store object.
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java.lang.reflect.Method m =
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c.getMethod("newInstance", Account.class, Context.class,
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PersistentDataCallbacks.class);
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// TODO Do the stores _really need a context? Is there a way to not pass it along?
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o = m.invoke(null, account, context, callbacks);
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} catch (Exception e) {
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Log.d(Logging.LOG_TAG, String.format(
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"exception %s invoking method %s#newInstance(Account, Context) for %s",
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e.toString(), className, account.mDisplayName));
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throw new MessagingException("can not instantiate Store for " + account.mDisplayName);
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}
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if (!(o instanceof Store)) {
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throw new MessagingException(
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account.mDisplayName + ": " + className + " create incompatible object");
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}
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return (Store) o;
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}
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/**
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* Look up descriptive information about a particular type of store.
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*/
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public static class StoreInfo {
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public String mScheme;
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public String mClassName;
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public boolean mPushSupported = false;
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public int mVisibleLimitDefault;
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public int mVisibleLimitIncrement;
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public int mAccountInstanceLimit;
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// TODO cache result for performance - silly to keep reading the XML
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public static StoreInfo getStoreInfo(String scheme, Context context) {
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StoreInfo result = getStoreInfo(R.xml.stores_product, scheme, context);
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if (result == null) {
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result = getStoreInfo(R.xml.stores, scheme, context);
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}
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return result;
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}
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public static StoreInfo getStoreInfo(int resourceId, String scheme, Context context) {
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try {
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XmlResourceParser xml = context.getResources().getXml(resourceId);
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int xmlEventType;
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// walk through stores.xml file.
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while ((xmlEventType = xml.next()) != XmlResourceParser.END_DOCUMENT) {
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if (xmlEventType == XmlResourceParser.START_TAG &&
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"store".equals(xml.getName())) {
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String xmlScheme = xml.getAttributeValue(null, "scheme");
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if (scheme != null && scheme.startsWith(xmlScheme)) {
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StoreInfo result = new StoreInfo();
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result.mScheme = xmlScheme;
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result.mClassName = xml.getAttributeValue(null, "class");
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result.mPushSupported = xml.getAttributeBooleanValue(
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null, "push", false);
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result.mVisibleLimitDefault = xml.getAttributeIntValue(
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null, "visibleLimitDefault", Email.VISIBLE_LIMIT_DEFAULT);
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result.mVisibleLimitIncrement = xml.getAttributeIntValue(
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null, "visibleLimitIncrement", Email.VISIBLE_LIMIT_INCREMENT);
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result.mAccountInstanceLimit = xml.getAttributeIntValue(
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null, "accountInstanceLimit", -1);
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return result;
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}
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}
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}
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} catch (XmlPullParserException e) {
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// ignore
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} catch (IOException e) {
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// ignore
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}
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return null;
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}
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}
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/**
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* Gets a unique key for the given account.
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* @throws MessagingException If the account is not setup properly (i.e. there is no address
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* or login)
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*/
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@VisibleForTesting
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static String getStoreKey(Context context, Account account) throws MessagingException {
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final StringBuffer key = new StringBuffer();
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final HostAuth recvAuth = account.getOrCreateHostAuthRecv(context);
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if (recvAuth.mAddress == null) {
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throw new MessagingException("Cannot find store for account " + account.mDisplayName);
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}
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final String address = recvAuth.mAddress.trim();
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if (TextUtils.isEmpty(address)) {
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throw new MessagingException("Cannot find store for account " + account.mDisplayName);
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}
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key.append(address);
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if (recvAuth.mLogin != null) {
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key.append(recvAuth.mLogin.trim());
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}
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return key.toString();
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}
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/**
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* Get an instance of a mail store for the given account. The account must be valid (i.e. has
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* at least an incoming server name).
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*
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* Username, password, and host are as expected.
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* Resource is protocol specific. For example, IMAP uses it as the path prefix. EAS uses it
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* as the domain.
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*
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* @param account The account of the store.
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* @return an initialized store of the appropriate class
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* @throws MessagingException If the store cannot be obtained or if the account is invalid.
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*/
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public synchronized static Store getInstance(Account account, Context context,
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PersistentDataCallbacks callbacks) throws MessagingException {
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String storeKey = getStoreKey(context, account);
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Store store = sStores.get(storeKey);
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if (store == null) {
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Context appContext = context.getApplicationContext();
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HostAuth recvAuth = account.getOrCreateHostAuthRecv(context);
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StoreInfo info = StoreInfo.getStoreInfo(recvAuth.mProtocol, context);
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if (info != null) {
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store = instantiateStore(info.mClassName, account, appContext, callbacks);
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}
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if (store != null) {
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sStores.put(storeKey, store);
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}
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} else {
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// update the callbacks, which may have been null at creation time.
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store.setPersistentDataCallbacks(callbacks);
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}
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if (store == null) {
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throw new MessagingException("Cannot find store for account " + account.mDisplayName);
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}
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return store;
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}
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/**
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* Delete the mail store associated with the given account. The account must be valid (i.e. has
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* at least an incoming server name).
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*
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* The store should have been notified already by calling delete(), and the caller should
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* also take responsibility for deleting the matching LocalStore, etc.
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*
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* @throws MessagingException If the store cannot be removed or if the account is invalid.
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*/
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public synchronized static void removeInstance(Account account, Context context)
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throws MessagingException {
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final String storeKey = getStoreKey(context, account);
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sStores.remove(storeKey);
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}
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/**
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* Get class of SettingActivity for this Store class.
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* @return Activity class that has class method actionEditIncomingSettings().
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*/
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public Class<? extends android.app.Activity> getSettingActivityClass() {
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// default SettingActivity class
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return com.android.email.activity.setup.AccountSetupIncoming.class;
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}
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/**
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* Get class of sync'er for this Store class
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* @return Message Sync controller, or null to use default
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*/
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public StoreSynchronizer getMessageSynchronizer() {
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return null;
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}
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/**
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* Some stores cannot download a message based only on the uid, and need the message structure
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* to be preloaded and provided to them. This method allows a remote store to signal this
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* requirement. Most stores do not need this and do not need to overload this method, which
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* simply returns "false" in the base class.
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* @return Return true if the remote store requires structure prefetch
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*/
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public boolean requireStructurePrefetch() {
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return false;
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}
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/**
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* Some protocols require that a sent message be copied (uploaded) into the Sent folder
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* while others can take care of it automatically (ideally, on the server). This function
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* allows a given store to indicate which mode(s) it supports.
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* @return true if the store requires an upload into "sent", false if this happens automatically
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* for any sent message.
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*/
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public boolean requireCopyMessageToSentFolder() {
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return true;
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}
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public abstract Folder getFolder(String name) throws MessagingException;
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public abstract Folder[] getAllFolders() throws MessagingException;
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public abstract Bundle checkSettings() throws MessagingException;
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/**
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* Delete Store and its corresponding resources.
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* @throws MessagingException
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*/
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public void delete() throws MessagingException {
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}
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/**
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* If a Store intends to implement callbacks, it should be prepared to update them
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* via overriding this method. They may not be available at creation time (in which case they
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* will be passed in as null.
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* @param callbacks The updated provider of store callbacks
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*/
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protected void setPersistentDataCallbacks(PersistentDataCallbacks callbacks) {
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}
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/**
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* Callback interface by which a Store can read and write persistent data.
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* TODO This needs to be made more generic & flexible
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*/
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public interface PersistentDataCallbacks {
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/**
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* Provides a small place for Stores to store persistent data.
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* @param key identifier for the data (e.g. "sync.key" or "folder.id")
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* @param value The data to persist. All data must be encoded into a string,
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* so use base64 or some other encoding if necessary.
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*/
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public void setPersistentString(String key, String value);
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/**
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* @param key identifier for the data (e.g. "sync.key" or "folder.id")
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* @param defaultValue The data to return if no data was ever saved for this store
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* @return the data saved by the Store, or null if never set.
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*/
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public String getPersistentString(String key, String defaultValue);
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}
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/**
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* Handle discovery of account settings using only the user's email address and password
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* @param context the context of the caller
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* @param emailAddress the email address of the exchange user
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* @param password the password of the exchange user
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* @return a Bundle containing an error code and a HostAuth (if successful)
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* @throws MessagingException
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*/
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public Bundle autoDiscover(Context context, String emailAddress, String password)
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throws MessagingException {
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return null;
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}
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}
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