← Google Drive + Mailgun integrations

Mailgun Send Email with Mailgun APIon Changes to Specific Files from Google Drive API

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Trigger workflow on
Changes to Specific Files from the Google Drive API
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Mailgun Send Email with the Mailgun API
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Getting Started

This integration creates a workflow with a Google Drive trigger and Mailgun action. When you configure and deploy the workflow, it will run on Pipedream's servers 24x7 for free.

  1. Select this integration
  2. Configure the Changes to Specific Files trigger
    1. Connect your Google Drive account
    2. Select a Drive
    3. Optional- Configure Watch for changes to file properties
    4. Configure Push notification renewal schedule
    5. Optional- Select one or more Files
    6. Select one or more Types of updates
  3. Configure the Mailgun Send Email action
    1. Connect your Mailgun account
    2. Select a Domain Name
    3. Configure From Name
    4. Configure From Email
    5. Optional- Configure Reply-To
    6. Configure To
    7. Optional- Configure CC
    8. Optional- Configure BCC
    9. Configure Subject
    10. Configure Message Body (text)
    11. Optional- Configure Message Body (HTML)
    12. Configure Send in test mode?
    13. Optional- Configure Use DKIM?
    14. Optional- Configure Use Tracking?
    15. Configure Halt on error?
  4. Deploy the workflow
  5. Send a test event to validate your setup
  6. Turn on the trigger

Details

This integration uses pre-built, open source components from Pipedream's GitHub repo. These components are developed by Pipedream and the community, and verified and maintained by Pipedream.

To contribute an update to an existing component or create a new component, create a PR on GitHub. If you're new to Pipedream component development, you can start with quickstarts for trigger span and action development, and then review the component API reference.

Trigger

Description:Watches for changes to specific files, emitting an event any time a change is made to one of those files
Version:0.0.12
Key:google_drive-changes-to-specific-files

Trigger Code

// This source processes changes to specific files in a user's Google Drive,
// implementing strategy enumerated in the Push Notifications API docs:
// https://developers.google.com/drive/api/v3/push .
//
// This source has two interfaces:
//
// 1) The HTTP requests tied to changes in the user's Google Drive
// 2) A timer that runs on regular intervals, renewing the notification channel as needed

const cronParser = require("cron-parser");
const includes = require("lodash/includes");
const { v4: uuid } = require("uuid");

const googleDrive = require("../../google_drive.app.js");
const common = require("../common-webhook.js");

module.exports = {
  ...common,
  key: "google_drive-changes-to-specific-files",
  name: "Changes to Specific Files",
  description:
    "Watches for changes to specific files, emitting an event any time a change is made to one of those files",
  version: "0.0.12",
  type: "source",
  // Dedupe events based on the "x-goog-message-number" header for the target channel:
  // https://developers.google.com/drive/api/v3/push#making-watch-requests
  dedupe: "unique",
  props: {
    ...common.props,
    files: {
      type: "string[]",
      label: "Files",
      description: "The files you want to watch for changes.",
      optional: true,
      default: [],
      options({ prevContext }) {
        const { nextPageToken } = prevContext;
        const baseOpts = {};
        const opts = this.isMyDrive()
          ? baseOpts
          : {
            ...baseOpts,
            corpora: "drive",
            driveId: this.getDriveId(),
            includeItemsFromAllDrives: true,
            supportsAllDrives: true,
          };
        return this.googleDrive.listFilesOptions(nextPageToken, opts);
      },
    },
    updateTypes: {
      propDefinition: [
        googleDrive,
        "updateTypes",
      ],
    },
  },
  hooks: {
    ...common.hooks,
    async activate() {
      // Called when a component is created or updated. Handles all the logic
      // for starting and stopping watch notifications tied to the desired
      // files.

      // You can pass the same channel ID in watch requests for multiple files, so
      // our channel ID is fixed for this component to simplify the state we have to
      // keep track of.
      const channelID = this.db.get("channelID") || uuid();

      // Subscriptions are keyed on Google's resourceID, "an opaque value that
      // identifies the watched resource". This value is included in request
      // headers, allowing us to look up the watched resource.
      let subscriptions = this.db.get("subscriptions") || {};

      for (const fileID of this.files) {
        const {
          expiration,
          resourceId,
        } = await this.googleDrive.watchFile(
          channelID,
          this.http.endpoint,
          fileID,
        );
        // The fileID must be kept with the subscription metadata so we can
        // renew the watch request for this specific file when it expires.
        subscriptions[resourceId] = {
          expiration,
          fileID,
        };
      }

      // Save metadata on the subscription so we can stop / renew later
      this.db.set("subscriptions", subscriptions);
      this.db.set("channelID", channelID);
    },
    async deactivate() {
      const channelID = this.db.get("channelID");
      if (!channelID) {
        console.log(
          "Channel not found, cannot stop notifications for non-existent channel",
        );
        return;
      }

      const subscriptions = this.db.get("subscriptions") || {};
      for (const resourceId of Object.keys(subscriptions)) {
        await this.googleDrive.stopNotifications(channelID, resourceId);
      }

      // Reset DB state
      this.db.set("subscriptions", {});
      this.db.set("channelID", null);
    },
  },
  methods: {
    ...common.methods,
    _getNextTimerEventTimestamp(event) {
      if (event.cron) {
        return cronParser
          .parseExpression(event.cron)
          .next()
          .getTime();
      }
      if (event.interval_seconds) {
        return Date.now() + event.interval_seconds * 1000;
      }
    },
    getUpdateTypes() {
      return this.updateTypes;
    },
  },
  async run(event) {
    // This function is polymorphic: it can be triggered as a cron job, to make sure we renew
    // watch requests for specific files, or via HTTP request (the change payloads from Google)

    let subscriptions = this.db.get("subscriptions") || {};
    const channelID = this.db.get("channelID");

    // Component was invoked by timer
    if (event.timestamp) {
      for (const [
        currentResourceId,
        metadata,
      ] of Object.entries(subscriptions)) {
        const { fileID } = metadata;
        // If the subscription for this resource will expire before the next run,
        // stop the existing subscription and renew
        if (metadata.expiration < this._getNextTimerEventTimestamp(event)) {
          console.log(
            `Notifications for resource ${currentResourceId} are expiring at ${metadata.expiration}. Renewing`,
          );
          await this.googleDrive.stopNotifications(
            channelID,
            currentResourceId,
          );
          const {
            expiration,
            resourceId,
          } = await this.googleDrive.watchFile(
            channelID,
            this.http.endpoint,
            fileID,
          );
          subscriptions[resourceId] = {
            expiration,
            fileID,
          };
        }
      }

      this.db.set("subscriptions", subscriptions);
      return;
    }

    const { headers } = event;

    if (
      !headers["x-goog-resource-state"] ||
      !headers["x-goog-resource-id"] ||
      !headers["x-goog-resource-uri"] ||
      !headers["x-goog-message-number"]
    ) {
      console.log("Request missing necessary headers: ", headers);
      return;
    }

    const incomingChannelID = headers["x-goog-channel-id"];
    if (incomingChannelID !== channelID) {
      console.log(
        `Channel ID of ${incomingChannelID} not equal to deployed component channel of ${channelID}`,
      );
      return;
    }

    if (subscriptions[headers["x-goog-resource-id"]] === undefined) {
      console.log(
        `Resource ID of ${headers["x-goog-resource-id"]} not currently being tracked. Exiting`,
      );
      return;
    }

    if (!includes(this.updateTypes, headers["x-goog-resource-state"])) {
      console.log(
        `Update type ${headers["x-goog-resource-state"]} not in list of updates to watch: `,
        this.updateTypes,
      );
      return;
    }

    // We observed false positives where a single change to a document would trigger two changes:
    // one to "properties" and another to "content,properties". But changes to properties
    // alone are legitimate, most users just won't want this source to emit in those cases.
    // If x-goog-changed is _only_ set to "properties", only move on if the user set the prop
    if (
      !this.watchForPropertiesChanges &&
      headers["x-goog-changed"] === "properties"
    ) {
      console.log(
        "Change to properties only, which this component is set to ignore. Exiting",
      );
      return;
    }

    const file = await this.googleDrive.getFileMetadata(
      headers["x-goog-resource-uri"],
    );

    if (!file || !Object.keys(file).length) {
      console.log("No file metadata returned, nothing to emit");
      return;
    }

    const eventToEmit = {
      file,
      change: {
        state: headers["x-goog-resource-state"],
        resourceURI: headers["x-goog-resource-uri"],
        changed: headers["x-goog-changed"], // "Additional details about the changes. Possible values: content, parents, children, permissions"
      },
    };

    this.$emit(eventToEmit, {
      summary: `${headers["x-goog-resource-state"].toUpperCase()} - ${
        file.name || "Untitled"
      }`,
      id: headers["x-goog-message-number"],
    });
  },
};

Trigger Configuration

This component may be configured based on the props defined in the component code. Pipedream automatically prompts for input values in the UI and CLI.
LabelPropTypeDescription
Google DrivegoogleDriveappThis component uses the Google Drive app.
N/Adb$.service.dbThis component uses $.service.db to maintain state between component invocations.
N/Ahttp$.interface.httpThis component uses $.interface.http to generate a unique URL when the component is first instantiated. Each request to the URL will trigger the run() method of the component.
DrivedrivestringSelect a value from the drop down menu.
Watch for changes to file propertieswatchForPropertiesChangesboolean

Watch for changes to file properties
in addition to changes to content. Defaults to false, watching for only changes to content.

Push notification renewal scheduletimer$.interface.timer

The Google Drive API requires occasional renewal of push notification subscriptions. This runs in the background, so you should not need to modify this schedule.

Filesfilesstring[]Select a value from the drop down menu.
Types of updatesupdateTypesstring[]Select a value from the drop down menu:syncaddremoveupdatetrashuntrashchange

Trigger Authentication

Google Drive uses OAuth authentication. When you connect your Google Drive account, Pipedream will open a popup window where you can sign into Google Drive and grant Pipedream permission to connect to your account. Pipedream securely stores and automatically refreshes the OAuth tokens so you can easily authenticate any Google Drive API.

Pipedream requests the following authorization scopes when you connect your account:

emailprofilehttps://www.googleapis.com/auth/drivehttps://www.googleapis.com/auth/drive.readonly

About Google Drive

Internet-related services and products

Action

Description:Send email with Mailgun.
Version:0.0.1
Key:mailgun-send-email

Action Code

const mailgun = require("../../mailgun.app.js");

module.exports = {
  key: "mailgun-send-email",
  name: "Mailgun Send Email",
  description: "Send email with Mailgun.",
  version: "0.0.1",
  type: "action",
  props: {
    mailgun,
    domain: {
      propDefinition: [
        mailgun,
        "domain",
      ],
    },
    fromName: {
      type: "string",
      label: "From Name",
      description: "Sender name",
    },
    from: {
      type: "string",
      label: "From Email",
      description: "Sender email address",
    },
    replyTo: {
      type: "string",
      label: "Reply-To",
      description: "Sender reply email address",
      optional: true,
    },
    to: {
      type: "string[]",
      label: "To",
      description: "Recipient email address(es)",
    },
    cc: {
      type: "string[]",
      label: "CC",
      description: "Copy email address(es)",
      optional: true,
    },
    bcc: {
      type: "string[]",
      label: "BCC",
      description: "Blind copy email address(es)",
      optional: true,
    },
    subject: {
      type: "string",
      label: "Subject",
      description: "Message subject",
    },
    text: {
      type: "string",
      label: "Message Body (text)",
    },
    html: {
      type: "string",
      label: "Message Body (HTML)",
      optional: true,
    },
    testMode: {
      type: "boolean",
      label: "Send in test mode?",
      default: true,
      description: "Enables sending in test mode. For more information, see the [Mailgun API documentation](https://documentation.mailgun.com/en/latest/api-sending.html#sending)",
    },
    dkim: {
      type: "boolean",
      label: "Use DKIM?",
      default: true,
      description: "Enables or disables DKIM signatures. For more information, see the [Mailgun API documentation](https://documentation.mailgun.com/en/latest/api-sending.html#sending)",
      optional: true,
    },
    tracking: {
      type: "boolean",
      label: "Use Tracking?",
      default: true,
      description: "Enables or disables tracking. For more information, see the [Mailgun API documentation](https://documentation.mailgun.com/en/latest/api-sending.html#sending)",
      optional: true,
    },
    haltOnError: {
      propDefinition: [
        mailgun,
        "haltOnError",
      ],
    },
  },
  async run () {
    try {
      const msg = {
        "from": `${this.fromName} <${this.from}>`,
        "to": this.to,
        "cc": this.cc,
        "bcc": this.bcc,
        "subject": this.subject,
        "text": this.text,
        "html": this.html,
        "o:testmode": this.testMode,
      };
      if (this.replyTo) {
        msg["h:Reply-To"] = this.replyTo;
      }
      if (this.dkim !== null) {
        msg["o:dkim"] = this.dkim
          ? "yes"
          : "no";
      }
      if (this.tracking) {
        msg["o:tracking"] = "yes";
      }
      return await this.mailgun.api("messages").create(this.domain, msg);
    } catch (err) {
      if (this.haltOnError) {
        throw err;
      }
      return err;
    }
  },
};

Action Configuration

This component may be configured based on the props defined in the component code. Pipedream automatically prompts for input values in the UI.

LabelPropTypeDescription
MailgunmailgunappThis component uses the Mailgun app.
Domain NamedomainstringSelect a value from the drop down menu.
From NamefromNamestring

Sender name

From Emailfromstring

Sender email address

Reply-ToreplyTostring

Sender reply email address

Totostring[]

Recipient email address(es)

CCccstring[]

Copy email address(es)

BCCbccstring[]

Blind copy email address(es)

Subjectsubjectstring

Message subject

Message Body (text)textstring
Message Body (HTML)htmlstring
Send in test mode?testModeboolean

Enables sending in test mode. For more information, see the Mailgun API documentation

Use DKIM?dkimboolean

Enables or disables DKIM signatures. For more information, see the Mailgun API documentation

Use Tracking?trackingboolean

Enables or disables tracking. For more information, see the Mailgun API documentation

Halt on error?haltOnErrorboolean

Action Authentication

Mailgun uses API keys for authentication. When you connect your Mailgun account, Pipedream securely stores the keys so you can easily authenticate to Mailgun APIs in both code and no-code steps.

Get your API Key in the Control Panel, specifically in Settings > API Keys. More info in docs.

If your Mailgun account resides in the EU, choose the EU option in the Region field. Otherwise, choose the US (non-EU) region.

About Mailgun

Sending, receiving and tracking email effortlessly

More Ways to Connect Mailgun + Google Drive

About Pipedream

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Powerful features that scale
Manage concurrency and execution rate
Manage concurrency and execution rate

Queue up to 10,000 events per workfow and manage the concurrency and rate at which workflows are triggered.

Process large payloads up to 5 terabytes
Process large payloads up to 5 terabytes

Large file support enables you to trigger workflows with any data (e.g., large JSON files, images and videos) up to 5 terabytes.

Return custom responses to HTTP requests
Return custom responses to HTTP requests

Return any JSON-serializable response from an HTTP triggered workflow using $respond().

Use most npm packages
Use most npm packages

To use any npm package, just require() it -- there's no npm install or package.json required.

Maintain state between executions
Maintain state between executions

Use $checkpoint to save state in one workflow invocation and read it the next time your workflow runs.

Pass data between steps
Pass data between steps

Return data from any step to inspect it in a human-friendly way and reference the data in future steps via the steps object.