com.google.gerrit.server.mail.send.MailSoySauceLoader Maven / Gradle / Ivy
// Copyright (C) 2016 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.gerrit.server.mail.send;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.io.CharStreams;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.plugincontext.PluginSetContext;
import com.google.inject.Inject;
import com.google.inject.ProvisionException;
import com.google.inject.Singleton;
import com.google.template.soy.SoyFileSet;
import com.google.template.soy.jbcsrc.api.SoySauce;
import java.io.IOException;
import java.io.Reader;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import org.eclipse.jgit.util.FileUtils;
/**
* Configures and loads Soy Sauce object for rendering email templates.
*
* It reloads templates each time when {@link #load()} is called.
*/
@Singleton
class MailSoySauceLoader {
// Note: will fail to construct the tofu object if this array is empty.
private static final String[] TEMPLATES = {
"Abandoned.soy",
"AbandonedHtml.soy",
"AddKey.soy",
"AddKeyHtml.soy",
"AddToAttentionSet.soy",
"AddToAttentionSetHtml.soy",
"ChangeFooter.soy",
"ChangeFooterHtml.soy",
"ChangeHeader.soy",
"ChangeHeaderHtml.soy",
"ChangeSubject.soy",
"Comment.soy",
"CommentHtml.soy",
"CommentFooter.soy",
"CommentFooterHtml.soy",
"DeleteKey.soy",
"DeleteKeyHtml.soy",
"DeleteReviewer.soy",
"DeleteReviewerHtml.soy",
"DeleteVote.soy",
"DeleteVoteHtml.soy",
"Email.soy",
"EmailHtml.soy",
"InboundEmailRejection.soy",
"InboundEmailRejectionHtml.soy",
"Footer.soy",
"FooterHtml.soy",
"HttpPasswordUpdate.soy",
"HttpPasswordUpdateHtml.soy",
"Merged.soy",
"MergedHtml.soy",
"NewChange.soy",
"NewChangeHtml.soy",
"NoReplyFooter.soy",
"NoReplyFooterHtml.soy",
"Private.soy",
"RegisterNewEmail.soy",
"RegisterNewEmailHtml.soy",
"RemoveFromAttentionSet.soy",
"RemoveFromAttentionSetHtml.soy",
"ReplacePatchSet.soy",
"ReplacePatchSetHtml.soy",
"Restored.soy",
"RestoredHtml.soy",
"Reverted.soy",
"RevertedHtml.soy",
};
private static final SoySauce DEFAULT = getDefault(null).build().compileTemplates();
private final SitePaths site;
private final PluginSetContext templateProviders;
@Inject
MailSoySauceLoader(SitePaths site, PluginSetContext templateProviders) {
this.site = site;
this.templateProviders = templateProviders;
}
public SoySauce load() {
if (!hasCustomTemplates(site, templateProviders)) {
return DEFAULT;
}
SoyFileSet.Builder builder = getDefault(site);
templateProviders.runEach(
e -> e.getFileNames().forEach(p -> addTemplate(builder, site, e.getPath(), p)));
return builder.build().compileTemplates();
}
private static boolean hasCustomTemplates(
SitePaths site, PluginSetContext templateProviders) {
try {
if (!templateProviders.isEmpty()) {
return true;
}
return Files.exists(site.mail_dir) && FileUtils.hasFiles(site.mail_dir);
} catch (IOException e) {
throw new StorageException(e);
}
}
private static SoyFileSet.Builder getDefault(@Nullable SitePaths site) {
SoyFileSet.Builder builder = SoyFileSet.builder();
for (String name : TEMPLATES) {
addTemplate(builder, site, "com/google/gerrit/server/mail/", name);
}
return builder;
}
private static void addTemplate(
SoyFileSet.Builder builder, @Nullable SitePaths site, String resourcePath, String name)
throws ProvisionException {
if (!resourcePath.endsWith("/")) {
resourcePath += "/";
}
String logicalPath = resourcePath + name;
if (site != null) {
// Load as a file in the mail templates directory if present.
Path tmpl = site.mail_dir.resolve(name);
if (Files.isRegularFile(tmpl)) {
String content;
// TODO(davido): Consider using JGit's FileSnapshot to cache based on
// mtime.
try (Reader r = Files.newBufferedReader(tmpl, StandardCharsets.UTF_8)) {
content = CharStreams.toString(r);
} catch (IOException err) {
throw new ProvisionException(
"Failed to read template file " + tmpl.toAbsolutePath(), err);
}
builder.add(content, logicalPath);
return;
}
}
// Otherwise load the template as a resource.
URL resource = MailSoySauceLoader.class.getClassLoader().getResource(logicalPath);
checkArgument(resource != null, "resource %s not found.", logicalPath);
builder.add(resource, logicalPath);
}
}