com.google.appengine.api.mail.MailService Maven / Gradle / Ivy
/*
* Copyright 2021 Google LLC
*
* 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
*
* https://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.appengine.api.mail;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* The {@code MailService} provides a way for user code to send emails
* to arbitrary destinations.
*
*/
public interface MailService {
public class Attachment {
private final String fileName;
private final byte[] data;
private final @Nullable String contentID;
/**
* Attachments are an optional part of messages, but if present, all
* information about them must be provided.
*
* @param fileName The attachment must have a filename associated with it.
* The extension on that filename must be present and not blocked, or
* there will be a failure at send time.
*
* @param data An array with arbitrary byte content. The array must be
* be present, but may be of zero length.
*
* @throws IllegalArgumentException if either fileName or data are missing.
*/
public Attachment (String fileName, byte[] data) {
this(fileName, data, null);
}
/**
* Attachments are an optional part of messages, but if present, all
* information about them must be provided.
*
* @param fileName The attachment must have a filename associated with it.
* The extension on that filename must be present and blocked, or
* there will be a failure at send time.
*
* @param data An array with arbitrary byte content. The array must be
* be present, but may be of zero length.
*
* @param contentID The attachment's content ID. May be null.
*
* @throws IllegalArgumentException if either fileName or data are missing.
*/
public Attachment(String fileName, byte[] data, @Nullable String contentID) {
if (data == null || fileName == null || fileName.length() == 0) {
throw new IllegalArgumentException("Attachment needs content and name");
}
this.fileName = fileName;
this.data = data;
this.contentID = contentID;
}
/**
* Gets the file name of this attachment.
*
* @return The file name of this attachment.
*/
public String getFileName() {
return fileName;
}
/**
* Gets the content of this attachment.
*
* @return The raw data of this attachment.
*/
public byte[] getData() {
return data;
}
public @Nullable String getContentID() {
return contentID;
}
}
public class Header {
private final String name;
private final String value;
/**
* Headers are an optional part of messages, but if present, all
* information about them must be provided.
*
* @param name The name of the header. It must be present and allowed.
*
* @param value The value of the header. It must be present, and it's
* content cannot be of zero length.
*
* @throws IllegalArgumentException if either name or data are missing.
*/
public Header(String name, String value) {
if (name == null || value == null ||
name.length() == 0 || value.length() == 0) {
throw new IllegalArgumentException("Header needs name and value");
}
this.name = name;
this.value = value;
}
/**
* Gets the name of this header.
*
* @return The name of this header.
*/
public String getName() {
return name;
}
/**
* Gets the value of this header.
*
* @return The value of this header.
*/
public String getValue() {
return value;
}
}
/**
* Messages are prepared by the caller, and then submitted to the Mail service
* for sending. Different fields are subject to different constraints, as
* enumerated in the {@code send} and {@code sendToAdmins} methods.
*/
public class Message {
private String sender;
private String replyTo;
private Collection to;
private Collection cc;
private Collection bcc;
private String subject;
private String textBody;
private String htmlBody;
private String ampHtmlBody;
private Collection attachments;
private Collection headers;
public Message() {}
/**
* Convenience constructor for simple messages
* @param sender The sender's email address.
* @param to The recipient's email address or null for empty to address.
* @param subject The message subject.
* @param textBody The text body of the message.
*/
public Message(String sender, String to, String subject, String textBody) {
this.sender = sender;
if (to == null) {
this.to = Arrays.asList();
} else {
this.to = Arrays.asList(to);
}
this.subject = subject;
this.textBody = textBody;
}
/**
* Gets the sender of this message.
*
* @return The sender of this message.
*/
public String getSender() {
return sender;
}
/**
* {@code sender} must correspond to the valid email address of one of
* the admins for this application, or to the email address of the
* currently logged-in user. Sender is really the From: field of the email.
*/
public void setSender(String sender) {
this.sender = sender;
}
/**
* Gets the reply to field of this message.
*
* @return The reply to field of this message.
*/
public String getReplyTo() {
return replyTo;
}
/**
* {@code replyTo} may be {@code null}, or must be a valid email
* address otherwise.
*/
public void setReplyTo(String replyTo) {
this.replyTo = replyTo;
}
/**
* Gets the recipients in the 'to' field of this message.
*
* @return A collection containing the 'to' field recipients.
*/
public Collection getTo() {
return to;
}
/**
* Sets the 'to' field of this message. Each string in the collection
* represents exactly one email address. Having null (or invalid addresses)
* will lead to eventual failure during the send process.
* @param to A collection containing the email addresses to set as the 'to'
* field.
*/
public void setTo(Collection to) {
this.to = to;
}
/**
* Sets the 'to' field of this message. Each string represents exactly one
* email address. Having null (or invalid addresses) will lead to eventual
* failure during the send process.
*
* @param to The email addresses to set as the 'to' field.
*/
public void setTo(String... to) {
this.to = Arrays.asList(to);
}
/**
* Gets the recipients in the 'cc' field of this message.
*
* @return A collection containing the 'cc' field recipients.
*/
public Collection getCc() {
return cc;
}
/**
* Sets the 'cc' field of this message. Each string in the collection
* represents exactly one email address. Having null (or invalid addresses)
* will lead cc eventual failure during the send process.
* @param cc A collection containing the email addresses cc set as the 'cc'
* field.
*/
public void setCc(Collection cc) {
this.cc = cc;
}
/**
* Sets the 'cc' field of this message. Each string represents exactly one
* email address. Having null (or invalid addresses) will lead cc eventual
* failure during the send process.
*
* @param cc The email addresses cc set as the 'cc' field.
*/
public void setCc(String... cc) {
this.cc = Arrays.asList(cc);
}
/**
* Gets the recipients in the 'bcc' field of this message.
*
* @return A collection containing the 'bcc' field recipients.
*/
public Collection getBcc() {
return bcc;
}
/**
* Sets the 'bcc' field of this message. Each string in the collection
* represents exactly one email address. Having null (or invalid addresses)
* will lead bcc eventual failure during the send process.
* @param bcc A collection containing the email addresses bcc set as the
* 'bcc' field.
*/
public void setBcc(Collection bcc) {
this.bcc = bcc;
}
/**
* Sets the 'bcc' field of this message. Each string represents exactly one
* email address. Having null (or invalid addresses) will lead bcc eventual
* failure during the send process.
*
* @param bcc The email addresses bcc set as the 'bcc' field.
*/
public void setBcc(String... bcc) {
this.bcc = Arrays.asList(bcc);
}
/**
* Gets the subject of this message.
*
* @return The subject of this message.
*/
public String getSubject() {
return subject;
}
/**
* Sets the subject of this message. A null or empty subject will lead to
* eventual failure during the send process.
*
* @param subject A string containing the new subject of this message.
*/
public void setSubject(String subject) {
this.subject = subject;
}
/**
* Gets the text body of this message.
*
* @return The text body.
*/
public String getTextBody() {
return textBody;
}
/**
* Sets the text body of this message. At least one of {@code textBody} and
* {@code htmlBody} must not be {@code null}.
* @param textBody A string containing the new text body of this message.
*/
public void setTextBody(String textBody) {
this.textBody = textBody;
}
/**
* Gets the html body of this message.
*
* @return The html body.
*/
public String getHtmlBody() {
return htmlBody;
}
/**
* Sets the html body of this message. At least one of {@code textBody} and {@code htmlBody}
* must not be {@code null}.
*
* @param htmlBody A string containing the new html body of this message.
*/
public void setHtmlBody(String htmlBody) {
this.htmlBody = htmlBody;
}
/**
* Gets the AMP HTML body of this message. See {@link #setAmpHtmlBody} for more details.
*
* @return The AMP HTML body.
*/
public String getAmpHtmlBody() {
return ampHtmlBody;
}
/**
* Sets the AMP HTML body of this message. This field is optional. Setting AMP HTML body makes
* the email an AMP Email. Plain text or HTML may become fallback content depending on the email
* client used.
*
* @param ampHtmlBody A string containing the new AMP HTML body of this message.
*/
public void setAmpHtmlBody(String ampHtmlBody) {
this.ampHtmlBody = ampHtmlBody;
}
/**
* Gets the attachments of this message.
*
* @return A collection containing the attachments of this message.
*/
public Collection getAttachments() {
return attachments;
}
/**
* Sets the attachments of this message. {@code attachments} may be
* {@code null}, otherwise each attachment must have a corresponding file
* name with an extension not on the block list.
* @param attachments A collection of attachments.
*/
public void setAttachments(Collection attachments) {
this.attachments = attachments;
}
/**
* Sets the attachments of this message. {@code attachments} may be
* {@code null}, otherwise each attachment must have a corresponding file
* name with an extension not on the block list.
* @param attachments Attachments to attach to this message.
*/
public void setAttachments(MailService.Attachment... attachments) {
this.attachments = Arrays.asList(attachments);
}
/**
* Gets the headers of this message.
*
* @return A collection containing the headers of this message.
*/
public Collection getHeaders() {
return headers;
}
/**
* Sets the headers of this message. {@code headers} may be {@code null},
* otherwise each header name must be one of the allowed names.
* @param headers A collection of headers.
*/
public void setHeaders(Collection headers) {
this.headers = headers;
}
/**
* Sets the headers of this message. {@code headers} may be {@code null},
* otherwise each header name must be one of the allowed names.
* @param headers A collection of headers.
*/
public void setHeaders(MailService.Header... headers) {
this.headers = Arrays.asList(headers);
}
}
/**
* Sends a mail that has been prepared in a MailService.Message.
*
* The message will be delivered asynchronously, and delivery problems
* will result in a bounce to the specified sender.
*
* {@code Sender} and at least one of the collections for {@code to, cc, bcc}
* must not be {@code null}.
*
* @param message The message to be sent.
* @throws IllegalArgumentException when incorrect arguments are passed.
* @throws IOException on internal delivery errors.
*/
public void send(MailService.Message message) throws IOException;
/**
* Send an email alert to all admins of an application.
*
* The message will be delivered asynchronously, and delivery problems
* will result in a bounce to the admins.
*
* The content of the {@code to, cc, bcc} fields should be {@code
* null}.
*
* @param message The message to be sent.
* @throws IllegalArgumentException when incorrect arguments are passed.
* @throws IOException on internal delivery errors.
*/
public void sendToAdmins(MailService.Message message) throws IOException;
}
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