Feature: SMTP-templating of `customBody` and `customHeader` via liquidjs (#3414)
* replaced the regex replacement engine with `Liquid` * added custom bodys * fixed a typo * formatting fixes * switched all template-variables to be camelCase
This commit is contained in:
Frank Elsinga
GitHub
parent
579d7232c9
commit
3fcb7bf181
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@ -1,6 +1,7 @@
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const nodemailer = require("nodemailer");
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const NotificationProvider = require("./notification-provider");
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const { DOWN } = require("../../src/util");
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const { Liquid } = require("liquidjs");
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class SMTP extends NotificationProvider {
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@ -39,76 +40,86 @@ class SMTP extends NotificationProvider {
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pass: notification.smtpPassword,
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};
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}
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// Lets start with default subject and empty string for custom one
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// default values in case the user does not want to template
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let subject = msg;
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// Change the subject if:
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// - The msg ends with "Testing" or
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// - Actual Up/Down Notification
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if ((monitorJSON && heartbeatJSON) || msg.endsWith("Testing")) {
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let customSubject = "";
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// Our subject cannot end with whitespace it's often raise spam score
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// Once I got "Cannot read property 'trim' of undefined", better be safe than sorry
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if (notification.customSubject) {
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customSubject = notification.customSubject.trim();
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}
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// If custom subject is not empty, change subject for notification
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if (customSubject !== "") {
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// Replace "MACROS" with corresponding variable
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let replaceName = new RegExp("{{NAME}}", "g");
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let replaceHostnameOrURL = new RegExp("{{HOSTNAME_OR_URL}}", "g");
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let replaceStatus = new RegExp("{{STATUS}}", "g");
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// Lets start with dummy values to simplify code
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let monitorName = "Test";
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let monitorHostnameOrURL = "testing.hostname";
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let serviceStatus = "⚠️ Test";
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if (monitorJSON !== null) {
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monitorName = monitorJSON["name"];
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if (monitorJSON["type"] === "http" || monitorJSON["type"] === "keyword" || monitorJSON["type"] === "json-query") {
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monitorHostnameOrURL = monitorJSON["url"];
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} else {
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monitorHostnameOrURL = monitorJSON["hostname"];
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}
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}
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if (heartbeatJSON !== null) {
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serviceStatus = (heartbeatJSON["status"] === DOWN) ? "🔴 Down" : "✅ Up";
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}
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// Break replace to one by line for better readability
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customSubject = customSubject.replace(replaceStatus, serviceStatus);
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customSubject = customSubject.replace(replaceName, monitorName);
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customSubject = customSubject.replace(replaceHostnameOrURL, monitorHostnameOrURL);
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subject = customSubject;
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}
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}
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let transporter = nodemailer.createTransport(config);
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let bodyTextContent = msg;
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let body = msg;
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if (heartbeatJSON) {
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bodyTextContent = `${msg}\nTime (${heartbeatJSON["timezone"]}): ${heartbeatJSON["localDateTime"]}`;
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body = `${msg}\nTime (${heartbeatJSON["timezone"]}): ${heartbeatJSON["localDateTime"]}`;
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}
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// subject and body are templated
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if ((monitorJSON && heartbeatJSON) || msg.endsWith("Testing")) {
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// cannot end with whitespace as this often raises spam scores
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const customSubject = notification.customSubject?.trim() || "";
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const customBody = notification.customBody?.trim() || "";
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const context = this.generateContext(msg, monitorJSON, heartbeatJSON);
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const engine = new Liquid();
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if (customSubject !== "") {
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const tpl = engine.parse(customSubject);
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subject = await engine.render(tpl, context);
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}
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if (customBody !== "") {
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const tpl = engine.parse(customBody);
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body = await engine.render(tpl, context);
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}
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}
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// send mail with defined transport object
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let transporter = nodemailer.createTransport(config);
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await transporter.sendMail({
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from: notification.smtpFrom,
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cc: notification.smtpCC,
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bcc: notification.smtpBCC,
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to: notification.smtpTo,
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subject: subject,
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text: bodyTextContent,
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text: body,
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});
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return "Sent Successfully.";
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}
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/**
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* Generate context for LiquidJS
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* @param {string} msg the message that will be included in the context
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* @param {?object} monitorJSON Monitor details (For Up/Down/Cert-Expiry only)
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* @param {?object} heartbeatJSON Heartbeat details (For Up/Down only)
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* @returns {{STATUS: string, status: string, HOSTNAME_OR_URL: string, hostnameOrUrl: string, NAME: string, name: string, monitorJSON: ?object, heartbeatJSON: ?object, msg: string}} the context
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*/
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generateContext(msg, monitorJSON, heartbeatJSON) {
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// Let's start with dummy values to simplify code
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let monitorName = "Monitor Name not available";
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let monitorHostnameOrURL = "testing.hostname";
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if (monitorJSON !== null) {
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monitorName = monitorJSON["name"];
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if (monitorJSON["type"] === "http" || monitorJSON["type"] === "keyword" || monitorJSON["type"] === "json-query") {
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monitorHostnameOrURL = monitorJSON["url"];
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} else {
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monitorHostnameOrURL = monitorJSON["hostname"];
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}
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}
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let serviceStatus = "⚠️ Test";
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if (heartbeatJSON !== null) {
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serviceStatus = (heartbeatJSON["status"] === DOWN) ? "🔴 Down" : "✅ Up";
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}
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return {
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// for v1 compatibility, to be removed in v3
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"STATUS": serviceStatus,
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"NAME": monitorName,
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"HOSTNAME_OR_URL": monitorHostnameOrURL,
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// variables which are officially supported
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"status": serviceStatus,
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"name": monitorName,
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"hostnameOrURL": monitorHostnameOrURL,
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monitorJSON,
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heartbeatJSON,
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msg,
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};
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}
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}
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module.exports = SMTP;
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@ -59,6 +59,28 @@
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<input id="to-bcc" v-model="$parent.notification.smtpBCC" type="text" class="form-control" autocomplete="false" :required="!hasRecipient">
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</div>
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<p class="form-text">
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<i18n-t tag="div" keypath="smtpLiquidIntroduction" class="form-text mb-3">
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<a href="https://liquidjs.com/" target="_blank">{{ $t("documentation") }}</a>
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</i18n-t>
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<code v-pre>{{name}}</code>: {{ $t("emailTemplateServiceName") }}<br />
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<code v-pre>{{msg}}</code>: {{ $t("emailTemplateMsg") }}<br />
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<code v-pre>{{status}}</code>: {{ $t("emailTemplateStatus") }}<br />
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<code v-pre>{{heartbeatJSON}}</code>: {{ $t("emailTemplateHeartbeatJSON") }}<b>{{ $t("emailTemplateLimitedToUpDownNotification") }}</b><br />
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<code v-pre>{{monitorJSON}}</code>: {{ $t("emailTemplateMonitorJSON") }} <b>{{ $t("emailTemplateLimitedToUpDownNotification") }}</b><br />
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<code v-pre>{{hostnameOrURL}}</code>: {{ $t("emailTemplateHostnameOrURL") }}<br />
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</p>
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<div class="mb-3">
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<label for="subject-email" class="form-label">{{ $t("emailCustomSubject") }}</label>
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<input id="subject-email" v-model="$parent.notification.customSubject" type="text" class="form-control" autocomplete="false" placeholder="">
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<div class="form-text">{{ $t("leave blank for default subject") }}</div>
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</div>
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<div class="mb-3">
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<label for="body-email" class="form-label">{{ $t("emailCustomBody") }}</label>
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<textarea id="body-email" v-model="$parent.notification.customBody" type="text" class="form-control" autocomplete="false" placeholder=""></textarea>
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<div class="form-text">{{ $t("leave blank for default body") }}</div>
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</div>
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<ToggleSection :heading="$t('smtpDkimSettings')">
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<i18n-t tag="div" keypath="smtpDkimDesc" class="form-text mb-3">
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<a href="https://nodemailer.com/dkim/" target="_blank">{{ $t("documentation") }}</a>
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@ -89,17 +111,6 @@
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<input id="dkim-skip-fields" v-model="$parent.notification.smtpDkimskipFields" type="text" class="form-control" autocomplete="false" placeholder="message-id:date">
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</div>
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</ToggleSection>
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<div class="mb-3">
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<label for="subject-email" class="form-label">{{ $t("emailCustomSubject") }}</label>
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<input id="subject-email" v-model="$parent.notification.customSubject" type="text" class="form-control" autocomplete="false" placeholder="">
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<div v-pre class="form-text">
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(leave blank for default one)<br />
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{{NAME}}: Service Name<br />
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{{HOSTNAME_OR_URL}}: Hostname or URL<br />
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{{STATUS}}: Status<br />
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</div>
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</div>
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</div>
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</template>
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@ -489,7 +489,19 @@
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"secureOptionTLS": "TLS (465)",
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"Ignore TLS Error": "Ignore TLS Error",
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"From Email": "From Email",
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"emailCustomisableContent": "Customisable content",
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"smtpLiquidIntroduction": "The following two fields are templatable via the Liquid templating Language. Please refer to the {0} for usage instructions. These are the available variables:",
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"emailCustomSubject": "Custom Subject",
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"leave blank for default subject": "leave blank for default subject",
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"emailCustomBody": "Custom Body",
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"leave blank for default body": "leave blank for default body",
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"emailTemplateServiceName": "Service Name",
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"emailTemplateHostnameOrURL": "Hostname or URL",
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"emailTemplateStatus": "Status",
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"emailTemplateMonitorJSON": "object describing the monitor",
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"emailTemplateHeartbeatJSON": "object describing the heartbeat",
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"emailTemplateMsg": "message of the notification",
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"emailTemplateLimitedToUpDownNotification": "only available for UP/DOWN heartbeats, otherwise null",
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"To Email": "To Email",
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"smtpCC": "CC",
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"smtpBCC": "BCC",
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