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概要

本スクリプトは指定の送信元メールアドレスとメールタイトルに一致するメールの添付JPGファイルをGoogleドライブ（フォルダ名：GmailAttachments）に自動保存するスクリプトです。（「巡回くん」の巡回画像送信先メールアドレスにはGmailを指定します）

Google Apps スクリプト

Googleドライブ>作成>スクリプトで空プロジェクトを作成後、以下のスクリプトをコピペします。

/*
Auto-Save your Gmail Image Attachments to Google Drive
======================================================
Fork written by Akio Higuchi on 17/07/2014
The default Google Drive folder for saving the image
attachments is "GmailAttachments" match the email-add
ress(to),email-address(from) and email-subject.
once the message has been processed, Gmail applies the
label "Processed" to that message.
You can change the defaults in line 43 & 44.
Auto-Save your Gmail Image Attachments to Google Drive
======================================================
Fork written by Noriaki Uchiyama on 11/05/2013
The default Google Drive folder for saving attachments
is "GmailAttachments" only has GMail label "@gdrive"
and once the message has been processed, Gmail applies
the label "Processed" to that message.
You can change the defaults in line 38 to 40.
Auto-Save your Gmail Image Attachments to Google Drive
======================================================
Written by Amit Agarwal on 05/28/2013
To get started, choose Run -> Authorize and grant the
necessary permissions. Then choose Run -> StartProgram.
The default Google Drive folder for saving the image
attachments is "Gmail Images" and once the message has
been processed, Gmail applies the label "Processed" to
that message. You can change the defaults in line 26 & 26.
*/
var FROM_MAIL_ADDRESS = "higuchi.akio@gmail.com"
var MAIL_SUBJECT = "[巡回]BB-HCM100"
// Authorize the Google Apps Script
function Authorize() {
StartProgram();
}
// Initialize the Script
function StartProgram() {
var DRIVE_FOLDER = "GmailAttachments";
var GMAIL_LABEL  = "Processed";
createGmailLabel(GMAIL_LABEL);
createDriveFolder(DRIVE_FOLDER);
createTrigger();
}
// The script will check your Gmail mailbox every minute
// with the help of a CLOCK based trigger.
function createTrigger() {
var triggers = ScriptApp.getScriptTriggers();
for(var i in triggers) {
ScriptApp.deleteTrigger(triggers[i]);
}
ScriptApp.newTrigger('saveGmailAttachments')
.timeBased()
.everyMinutes(1)
.create();
}
// If the Gmail label is unavailable, create one.
function createGmailLabel(name) {
if ( ! GmailApp.getUserLabelByName(name) ) {
GmailApp.createLabel(name);
}
ScriptProperties.setProperty("LABEL", name);
}
// If the Google Drive folder is not present, create one.
function createDriveFolder(name) {
var folders = DriveApp.getFolders();
var folder, found = false;
while (folders.hasNext()) {
folder = folders.next();
if (folder.getName() === name) {
found = true;
break;
}
}
if ( ! found ) {
DriveApp.createFolder(name);
}
ScriptProperties.setProperty("FOLDER_ID", folder.getId());
}
// This will auto-save the image attachments from Gmail to Google Drive
function saveGmailAttachments() {
var from_mailaddress = FROM_MAIL_ADDRESS;
var mailsubject = MAIL_SUBJECT;
var label_name = ScriptProperties.getProperty("LABEL");
var label = GmailApp.getUserLabelByName(label_name);
var folderID  = DriveApp.getFolderById(ScriptProperties.getProperty("FOLDER_ID"));
// Scan for threads that have image attachments
var threads = GmailApp.search("in:all -in:spam -in:trash -in:" + label_name
+ " has:attachment filename:jpg"
+ " from:" + from_mailaddress
+ " subject:" + mailsubject
, 0, 10);
try {
for (var x=0; x<threads.length; x++) {
var messages = threads[x].getMessages();
for (var y=0; y<messages.length; y++) {
var attachments = messages[y].getAttachments();
for (var z=0; z<attachments.length; z++) {
var file = attachments[z];
// Only save image attachments that have the MIME type as image.
if (file.getContentType().match(/image/gi)) {
folderID.createFile(file);
}
}
}
// Process messages are labelled to skip them in the next iteration.
threads[x].addLabel(label);
}
}
catch (e) {
Logger.log(e.toString());
}
}

43行目を送信元メールアドレス、44行目を「巡回くん」の送信メールタイトルに書き換えてください。

var FROM_MAIL_ADDRESS = "送信元メールアドレス"
var MAIL_SUBJECT = "「巡回くん」メールタイトル"

また、124行目あたりでGmailの検索を行っています。クエリを書き換えて検索条件をかえることができます。（Gmail 詳細検索の説明はこちら）

もちろんスマートフォンでも

Googleドライブに画像が自動でUPされるので外出先でも簡単に画像を時系列で確認できイイ感じです。

スクリプトの定期実行をストップさせたい場合

スクリプトの実行を停止したい場合は次のように操作してトリガーを削除してください。

リソース>現在のプロジェクトのトリガーをクリック

ｘをクリックして現在のトリガー（saveGmailAttachments）を削除します。

これでスクリプトの定期実行はストップします。

参考にさせていただきいました

GMAIL OCR WITH GOOGLE APPS SCRIPT
GMailで特定のラベルを付けたメールの添付ファイルを自動でGoogle Driveに保存するGoogle Appsスクリプト