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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.appindexing.util;
import com.android.SdkConstants;
import com.google.common.collect.Lists;
import com.intellij.psi.xml.XmlTag;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.List;
/**
* Util functions for searching deep links.
* <p/>
* For more information, see
* http://developer.android.com/training/app-indexing/deep-linking.html
*/
public final class DeepLinkUtils {
private static final String TAG_ACTION = "action";
private static final String TAG_CATEGORY = "category";
private static final String ACTION_VIEW = "android.intent.action.VIEW";
private static final String CATEGORY_DEFAULT = "android.intent.category.DEFAULT";
private static final String CATEGORY_BROWSABLE = "android.intent.category.BROWSABLE";
/**
* Returns all matching deep links from a root xml tag.
*
* @param root The root xml tag, usually is the root tag of AndroidManifest.xml
* @return All matching deep links
*/
@NotNull
public static List<String> getAllDeepLinks(@NotNull XmlTag root) {
List<XmlTag> intentFilters = ManifestUtils.searchXmlTagsByName(root, SdkConstants.TAG_INTENT_FILTER);
List<String> deepLinks = Lists.newArrayList();
for (XmlTag intentFilter : intentFilters) {
String deepLink = getDeepLinkFromIntentFilter(intentFilter);
if (deepLink != null) {
deepLinks.add(deepLink);
}
}
return deepLinks;
}
/**
* Returns the deep link within an intent filter xml tag.
*/
@Nullable
private static String getDeepLinkFromIntentFilter(@NotNull XmlTag intentFilter) {
// Check action.
List<XmlTag> actions = ManifestUtils.searchXmlTagsByName(intentFilter, TAG_ACTION);
boolean hasActionView = false;
for (XmlTag action : actions) {
String name = action.getAttributeValue(SdkConstants.ATTR_NAME, SdkConstants.NS_RESOURCES);
if (name != null && name.equals(ACTION_VIEW)) {
hasActionView = true;
break;
}
}
if (!hasActionView) {
return null;
}
// Check category
List<XmlTag> categories = ManifestUtils.searchXmlTagsByName(intentFilter, TAG_CATEGORY);
boolean hasDefaultCategory = false;
boolean hasBrowsableCategory = false;
for (XmlTag category : categories) {
String name = category.getAttributeValue(SdkConstants.ATTR_NAME, SdkConstants.NS_RESOURCES);
if (name != null && name.equals(CATEGORY_DEFAULT)) {
hasDefaultCategory = true;
}
else if (name != null && name.equals(CATEGORY_BROWSABLE)) {
hasBrowsableCategory = true;
}
}
if (!hasDefaultCategory || !hasBrowsableCategory) {
return null;
}
// Parse deep link
List<XmlTag> datas = ManifestUtils.searchXmlTagsByName(intentFilter, SdkConstants.TAG_DATA);
String scheme = null, host = null, pathPrefix = null, path = null;
for (XmlTag data : datas) {
if (scheme == null) {
scheme = data.getAttributeValue(SdkConstants.ATTR_SCHEME, SdkConstants.NS_RESOURCES);
}
if (host == null) {
host = data.getAttributeValue(SdkConstants.ATTR_HOST, SdkConstants.NS_RESOURCES);
}
if (pathPrefix == null) {
pathPrefix = data.getAttributeValue(SdkConstants.ATTR_PATH_PREFIX, SdkConstants.NS_RESOURCES);
}
if (path == null) {
path = data.getAttributeValue(SdkConstants.ATTR_PATH, SdkConstants.NS_RESOURCES);
}
}
// Build a deep link, which should look something like
// "http://", "http://host", "http://host/path-prefix" or "http://host/path.html".
// Incomplete deep links are OK since we only want to generate what we can,
// and AppIndexingApiDetector will issue errors for users to fix bad deep links.
if (scheme != null) {
StringBuilder buf = new StringBuilder(scheme);
buf.append("://");
if (host != null) {
buf.append(host);
if (path != null && path.startsWith("/")) {
buf.append(path);
}
else if (pathPrefix != null && pathPrefix.startsWith("/")) {
buf.append(pathPrefix);
}
}
return buf.toString();
}
return null;
}
}
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