Generate PDF with HTML 2 PDF API on New Created or Updated Event (Instant) from Google Calendar API

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New Created or Updated Event (Instant) from the Google Calendar API

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Generate PDF with the HTML 2 PDF API

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Getting Started#

This integration creates a workflow with a Google Calendar trigger and HTML 2 PDF action. When you configure and deploy the workflow, it will run on Pipedream's servers 24x7 for free.

Select this integration
Configure the New Created or Updated Event (Instant) trigger
1. Connect your Google Calendar account
2. Optional- Select one or more Calendars
3. Optional- Configure Emit only for new events
4. Configure Push notification renewal schedule
Configure the Generate PDF action
1. Connect your HTML 2 PDF account
2. Optional- Configure URL
3. Optional- Configure HTML
4. Optional- Configure Header
5. Optional- Configure Footer
6. Optional- Configure Page Offset
7. Optional- Select a Page Size
8. Optional- Select a Orientation
9. Optional- Configure Width
10. Optional- Configure Height
11. Optional- Configure Top Margin
12. Optional- Configure Bottom Margin
13. Optional- Configure Left
14. Optional- Configure Right
15. Optional- Select a Unit
16. Optional- Select a CSS Media Type
17. Optional- Configure Optimize Layout
18. Optional- Configure Lazy Load
19. Optional- Configure Wait Time
20. Optional- Configure CSS
Deploy the workflow
Send a test event to validate your setup
Turn on the trigger

Details#

This integration uses pre-built, source-available 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#

New Created or Updated Event (Instant) on Google Calendar

Description:Emit new event when a Google Calendar events is created or updated (does not emit cancelled events)

Version:0.1.15

Key:google_calendar-new-or-updated-event-instant

View on GitHub

Google Calendar Overview#

The Google Calendar API lets you dip into the powerhouse of scheduling, allowing for the reading, creation, and manipulation of events and calendars directly from your applications. Through Pipedream, you can seamlessly integrate Google Calendar into a myriad of workflows, automating event management, syncing with other services, setting up custom reminders, or even collating data for reporting. The key here is to streamline your calendar-related processes, ensuring that your time management is as efficient and automated as possible.

Trigger Code#

import { v4 as uuid } from "uuid";
import sampleEmit from "./test-event.mjs";
import googleCalendar from "../../google_calendar.app.mjs";
import constants from "../../common/constants.mjs";

export default {
  key: "google_calendar-new-or-updated-event-instant",
  type: "source",
  name: "New Created or Updated Event (Instant)",
  description: "Emit new event when a Google Calendar events is created or updated (does not emit cancelled events)",
  version: "0.1.15",
  dedupe: "unique",
  props: {
    googleCalendar,
    db: "$.service.db",
    calendarIds: {
      propDefinition: [
        googleCalendar,
        "calendarId",
      ],
      type: "string[]",
      default: [
        "primary",
      ],
      label: "Calendars",
      description: "Select one or more calendars to watch (defaults to the primary calendar)",
    },
    newOnly: {
      label: "Emit only for new events",
      type: "boolean",
      description: "Emit new events only, and not updates to existing events (defaults to `false`)",
      optional: true,
      default: false,
    },
    http: "$.interface.http",
    timer: {
      label: "Push notification renewal schedule",
      description: "The Google Calendar API requires occasional renewal of push notification subscriptions. **This runs in the background, so you should not need to modify this schedule**.",
      type: "$.interface.timer",
      static: {
        intervalSeconds: constants.WEBHOOK_SUBSCRIPTION_RENEWAL_SECONDS,
      },
    },
  },
  hooks: {
    async deploy() {
      const events = [];
      const params = {
        maxResults: 25,
        orderBy: "updated",
      };
      for (const calendarId of this.calendarIds) {
        params.calendarId = calendarId;
        const { items } = await this.googleCalendar.listEvents(params);
        events.push(...items);
      }
      events.sort((a, b) => (Date.parse(a.updated) > Date.parse(b.updated))
        ? 1
        : -1);
      for (const event of events.slice(-25)) {
        const meta = this.generateMeta(event);
        this.$emit(event, meta);
      }
    },
    async activate() {
      await this.makeWatchRequest();
    },
    async deactivate() {
      try {
        await this.stopWatchRequest();
      } catch (e) {
        console.log(`Error deactivating webhook. ${e}`);
      }
    },
  },
  methods: {
    setNextSyncToken(calendarId, nextSyncToken) {
      this.db.set(`${calendarId}.nextSyncToken`, nextSyncToken);
    },
    getNextSyncToken(calendarId) {
      return this.db.get(`${calendarId}.nextSyncToken`);
    },
    setChannelId(calendarId, channelId) {
      this.db.set(`${calendarId}.channelId`, channelId);
    },
    getChannelId(calendarId) {
      return this.db.get(`${calendarId}.channelId`);
    },
    setResourceId(calendarId, resourceId) {
      this.db.set(`${calendarId}.resourceId`, resourceId);
    },
    getResourceId(calendarId) {
      return this.db.get(`${calendarId}.resourceId`);
    },
    setExpiration(calendarId, expiration) {
      this.db.set(`${calendarId}.expiration`, expiration);
    },
    getExpiration(calendarId) {
      return this.db.get(`${calendarId}.expiration`);
    },
    /**
     * A utility method to compute whether the provided event is newly created
     * or not. Since the Google Calendar API does not provide a specific way to
     * determine this, this method estimates the result based on the `created`
     * and `updated` timestamps: if they are more than 2 seconds apart, then we
     * assume that the event is not new.
     *
     * @param {Object} event - The calendar event being processed
     * @returns {Boolean} True if the input event is a newly created event, or
     * false otherwise
     */
    _isNewEvent(event) {
      const {
        created,
        updated,
      } = event;
      const createdTimestampMilliseconds = Date.parse(created);
      const updatedTimestampMilliseconds = Date.parse(updated);
      const diffMilliseconds = Math.abs(
        updatedTimestampMilliseconds - createdTimestampMilliseconds,
      );
      const maxDiffMilliseconds = 2000;
      return diffMilliseconds <= maxDiffMilliseconds;
    },
    /**
     * A utility method to compute whether the provided event is relevant to the
     * event source (and as a consequence must be processed) or not.
     *
     * @param {Object} event - The calendar event being processed
     * @returns {Boolean} True if the input event must be processed, or false
     * otherwise (i.e. if the event must be skipped)
     */
    isEventRelevant(event) {
      return !this.newOnly || this._isNewEvent(event);
    },
    generateMeta(event) {
      const {
        id,
        summary,
        updated: tsString,
      } = event;
      const ts = Date.parse(tsString);
      return {
        id: `${id}-${ts}`,
        summary,
        ts,
      };
    },
    async makeWatchRequest() {
      // Make watch request for this HTTP endpoint
      for (const calendarId of this.calendarIds) {
        const watchResp =
          await this.googleCalendar.watchEvents({
            calendarId,
            requestBody: {
              id: uuid(),
              type: "web_hook",
              address: this.http.endpoint,
            },
          });

        // Initial full sync. Get next sync token
        const nextSyncToken = await this.googleCalendar.fullSync(calendarId);

        this.setNextSyncToken(calendarId, nextSyncToken);
        this.setChannelId(calendarId, watchResp.id);
        this.setResourceId(calendarId, watchResp.resourceId);
        this.setExpiration(calendarId, watchResp.expiration);
      }
    },
    async stopWatchRequest() {
      for (const calendarId of this.calendarIds) {
        const id = this.getChannelId(calendarId);
        const resourceId = this.getResourceId(calendarId);
        if (id && resourceId) {
          const { status } =
            await this.googleCalendar.stopChannel({
              returnOnlyData: false,
              requestBody: {
                id,
                resourceId,
              },
            });
          if (status === 204) {
            console.log("webhook deactivated");
            this.setNextSyncToken(calendarId, null);
            this.setChannelId(calendarId, null);
            this.setResourceId(calendarId, null);
            this.setExpiration(calendarId, null);
          } else {
            console.log("There was a problem deactivating the webhook");
          }
        }
      }
    },
    getSoonestExpirationDate() {
      let min;
      for (const calendarId of this.calendarIds) {
        const expiration = parseInt(this.db.get(`${calendarId}.expiration`));
        if (!min || expiration < min) {
          min = expiration;
        }
      }
      return new Date(min);
    },
    getCalendarIdForChannelId(incomingChannelId) {
      for (const calendarId of this.calendarIds) {
        if (this.db.get(`${calendarId}.channelId`) === incomingChannelId) {
          return calendarId;
        }
      }
      return null;
    },
  },
  async run(event) {
    let calendarId = null; // calendar ID matching incoming channel ID

    // refresh watch
    if (event.interval_seconds) {
      // get time
      const now = new Date();
      const intervalMs = event.interval_seconds * 1000;
      // get expiration
      const expireDate = this.getSoonestExpirationDate();

      // if now + interval > expiration, refresh watch
      if (now.getTime() + intervalMs > expireDate.getTime()) {
        await this.stopWatchRequest();
        await this.makeWatchRequest();
      }
    } else {
      // Verify channel ID
      const incomingChannelId = event?.headers?.["x-goog-channel-id"];
      calendarId = this.getCalendarIdForChannelId(incomingChannelId);
      if (!calendarId) {
        console.log(
          `Unexpected channel ID ${incomingChannelId}. This likely means there are multiple, older subscriptions active.`,
        );
        return;
      }

      // Check that resource state === exists
      const state = event?.headers?.["x-goog-resource-state"];
      switch (state) {
      case "exists":
        // there's something to emit, so keep going
        break;
      case "not_exists":
        console.log("Resource does not exist. Exiting.");
        return;
      case "sync":
        console.log("New channel created");
        return;
      default:
        console.log(`Unknown state: ${state}`);
        return;
      }
    }

    // Fetch and emit events
    const checkCalendarIds = calendarId
      ? [
        calendarId,
      ]
      : this.calendarIds;
    for (const calendarId of checkCalendarIds) {
      const syncToken = this.getNextSyncToken(calendarId);
      let nextSyncToken = null;
      let nextPageToken = null;
      while (!nextSyncToken) {
        try {
          const { data: syncData = {} } = await this.googleCalendar.listEvents({
            returnOnlyData: false,
            calendarId,
            syncToken,
            pageToken: nextPageToken,
            maxResults: 2500,
          });

          nextPageToken = syncData.nextPageToken;
          nextSyncToken = syncData.nextSyncToken;

          const { items: events = [] } = syncData;
          events
            .filter(this.isEventRelevant, this)
            .forEach((event) => {
              const { status } = event;
              if (status === "cancelled") {
                console.log("Event cancelled. Exiting.");
                return;
              }
              const meta = this.generateMeta(event);
              this.$emit(event, meta);
            });
        } catch (error) {
          if (error === "Sync token is no longer valid, a full sync is required.") {
            console.log("Sync token invalid, resyncing");
            nextSyncToken = await this.googleCalendar.fullSync(calendarId);
            break;
          } else {
            throw error;
          }
        }
      }

      this.setNextSyncToken(calendarId, nextSyncToken);
    }
  },
  sampleEmit,
};

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.

Label	Prop	Type	Description
Google Calendar	`googleCalendar`	`app`	This component uses the Google Calendar app.
N/A	`db`	`$.service.db`	This component uses `$.service.db` to maintain state between executions.
Calendars	`calendarIds`	`string[]`	Select a value from the drop down menu.
Emit only for new events	`newOnly`	`boolean`	Emit new events only, and not updates to existing events (defaults to `false`)
N/A	`http`	`$.interface.http`	This component uses `$.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.
Push notification renewal schedule	`timer`	`$.interface.timer`	The Google Calendar API requires occasional renewal of push notification subscriptions. This runs in the background, so you should not need to modify this schedule.

Trigger Authentication#

Google Calendar uses OAuth authentication. When you connect your Google Calendar account, Pipedream will open a popup window where you can sign into Google Calendar 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 Calendar API.

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

https://www.googleapis.com/auth/calendar.eventshttps://www.googleapis.com/auth/calendar.readonlyhttps://www.googleapis.com/auth/calendar.settings.readonlyemailprofile

About Google Calendar#

With Google Calendar, you can quickly schedule meetings and events and get reminders about upcoming activities, so you always know what’s next.

Action#

Generate PDF on HTML 2 PDF

Description:Creates a PDF from a URL or HTML string. [See the documentation](https://www.html2pdf.co.uk/api-documentation)

Version:0.0.1

Key:html_2_pdf-generate-pdf

View on GitHub

HTML 2 PDF Overview#

The HTML 2 PDF API allows you to convert HTML documents to PDFs. In Pipedream, you can integrate this API into workflows to automate document generation tasks. This can be incredibly useful for generating reports, invoices, or any other document where you start with HTML and need a PDF output. You can trigger these conversions with various events – like a new form submission, a scheduled trigger, or even updates in a database.

Action Code#

import { ConfigurationError } from "@pipedream/platform";
import fs from "fs";
import {
  PAGE_SIZE_OPTIONS, UNIT_OPTIONS,
} from "../../common/constants.mjs";
import html2Pdf from "../../html_2_pdf.app.mjs";

export default {
  key: "html_2_pdf-generate-pdf",
  name: "Generate PDF",
  description: "Creates a PDF from a URL or HTML string. [See the documentation](https://www.html2pdf.co.uk/api-documentation)",
  version: "0.0.1",
  type: "action",
  props: {
    html2Pdf,
    url: {
      type: "string",
      label: "URL",
      description: "The URL you want to convert to PDF.",
      optional: true,
    },
    html: {
      type: "string",
      label: "HTML",
      description: "The HTML you want to convert to PDF.",
      optional: true,
    },
    header: {
      type: "string",
      label: "Header",
      description: "Header in HTML format.",
      optional: true,
    },
    footer: {
      type: "string",
      label: "Footer",
      description: "Footer in HTML format.",
      optional: true,
    },
    pageOffset: {
      type: "integer",
      label: "Page Offset",
      description: "Number to offset your page number",
      optional: true,
    },
    pageSize: {
      type: "string",
      label: "Page Size",
      description: "The standard page formats.",
      optional: true,
      options: PAGE_SIZE_OPTIONS,
    },
    orientation: {
      type: "string",
      label: "Orientation",
      description: "The page orientation.",
      optional: true,
      options: [
        "portrait",
        "landscape",
      ],
    },
    width: {
      type: "string",
      label: "Width",
      description: "Custom width (overrides 'Page Size').",
      optional: true,
    },
    height: {
      type: "string",
      label: "Height",
      description: "Custom height (overrides 'Page Size').",
      optional: true,
    },
    top: {
      type: "string",
      label: "Top Margin",
      description: "You need one if you want to display a header.",
      optional: true,
    },
    bottom: {
      type: "string",
      label: "Bottom Margin",
      description: "You need one if you want to display a footer.",
      optional: true,
    },
    left: {
      type: "string",
      label: "Left",
      description: "Left margin.",
      optional: true,
    },
    right: {
      type: "string",
      label: "Right",
      description: "Right margin.",
      optional: true,
    },
    unit: {
      type: "string",
      label: "Unit",
      description: "Unit for the custom width, height and margins.",
      optional: true,
      options: UNIT_OPTIONS,
    },
    cssMediaType: {
      type: "string",
      label: "CSS Media Type",
      description: "The layout CSS media type.",
      options: [
        "print",
        "screen",
      ],
      optional: true,
    },
    optimizeLayout: {
      type: "boolean",
      label: "Optimize Layout",
      description: "Set this to **true** if you want us to auto-optimize your layout. This helps static items on your page to only show up once, instead of on every page.",
      optional: true,
    },
    lazyLoad: {
      type: "boolean",
      label: "Lazy Load",
      description: "Set this to **true** if you want our software to wait for content to lazy load.",
      optional: true,
    },
    waitTime: {
      type: "integer",
      label: "Wait Time",
      description: "**Time in milliseconds** that you want our software to wait after the page is loaded. You typically use this when you have long running JavaScript for graphs and tables.",
      optional: true,
    },
    css: {
      type: "string",
      label: "CSS",
      description: "Use custom CSS to overwrite the default styles of your page.",
      optional: true,
    },
  },
  async run({ $ }) {
    if ((!this.url && !this.html) || (this.url && this.html)) {
      throw new ConfigurationError("You must provide either URL or HTML.");
    }
    const response = await this.html2Pdf.createPdf({
      $,
      responseType: "arraybuffer",
      params: {
        url: this.url,
        html: this.html,
        header: this.header,
        footer: this.footer,
        page_offset: this.pageOffset,
        page_size: this.pageSize,
        orientation: this.orientation,
        width: this.width,
        height: this.height,
        top: this.top,
        bottom: this.bottom,
        left: this.left,
        right: this.right,
        unit: this.unit,
        css_media_type: this.cssMediaType,
        optimize_layout: this.optimizeLayout,
        lazy_load: this.lazyLoad,
        wait_time: this.waitTime,
        css: this.css,
      },
    });

    const filePath = `/tmp/${Date.now()}.pdf`;
    fs.writeFileSync(filePath, response);

    $.export("$summary", "Generated PDF is saved at");
    $.export("file_path", filePath);
    return filePath;
  },
};

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.

Label	Prop	Type	Description
HTML 2 PDF	`html2Pdf`	`app`	This component uses the HTML 2 PDF app.
URL	`url`	`string`	The URL you want to convert to PDF.
HTML	`html`	`string`	The HTML you want to convert to PDF.
Header	`header`	`string`	Header in HTML format.
Footer	`footer`	`string`	Footer in HTML format.
Page Offset	`pageOffset`	`integer`	Number to offset your page number
Page Size	`pageSize`	`string`	Select a value from the drop down menu:`{ "value": "A0", "label": "A0 - 841 x 1189 mm, 33.1 x 46.8 in" }{ "value": "A1", "label": "A1 - 594 x 841 mm, 23.4 x 33.1 in" }{ "value": "A2", "label": "A2 - 420 x 594 mm, 16.5 x 23.4 in" }{ "value": "A3", "label": "A3 - 297 x 420 mm, 11.7 x 16.5 in" }{ "value": "A4", "label": "A4 - 210 x 297 mm, 8.3 x 11.7 in" }{ "value": "A5", "label": "A5 - 148 x 210 mm, 5.8 x 8.3 in" }{ "value": "A6", "label": "A6 - 105 x 148 mm, 4.1 x 5.8 in" }{ "value": "A7", "label": "A7 - 74 x 105 mm, 2.9 x 4.1 in" }{ "value": "A8", "label": "A8 - 52 x 74 mm, 2.1 x 2.9 in" }{ "value": "A9", "label": "A9 - 37 x 52 mm, 1.5 x 2.1 in" }{ "value": "B0", "label": "B0 - 1000 x 1414 mm, 39.4 x 55.7 in" }{ "value": "B1", "label": "B1 - 707 x 1000 mm, 27.8 x 39.4 in" }{ "value": "B2", "label": "B2 - 500 x 707 mm, 19.7 x 27.8 in" }{ "value": "B3", "label": "B3 - 353 x 500 mm, 13.9 x 19.7 in" }{ "value": "B4", "label": "B4 - 250 x 353 mm, 9.8 x 13.9 in" }{ "value": "B5", "label": "B5 - 176 x 250 mm, 6.9 x 9.8 in" }{ "value": "B6", "label": "B6 - 125 x 176 mm, 4.9 x 6.9 in" }{ "value": "B7", "label": "B7 - 88 x 125 mm, 3.5 x 4.9 in" }{ "value": "B8", "label": "B8 - 62 x 88 mm, 2.4 x 3.5 in" }{ "value": "B9", "label": "B9 - 44 x 62 mm, 1.7 x 2.4 in" }{ "value": "B10", "label": "B10 - 31 x 44 mm, 1.2 x 1.7 in" }{ "value": "C5E", "label": "C5E - 163 x 229 mm" }{ "value": "Comm10E", "label": "Comm10E - 105 x 241 mm, U.S. Common 10 Envelope" }{ "value": "DLE", "label": "DLE - 110 x 220 mm" }{ "value": "Executive", "label": "Executive - 7.25 x 10.5 in" }{ "value": "Folio", "label": "Folio - 210 x 330 mm" }{ "value": "Ledger", "label": "Ledger - 17 x 11 in" }{ "value": "Legal", "label": "Legal - 8.5 x 14.0 in" }{ "value": "Letter", "label": "Letter - 8.5 x 11.0 in" }{ "value": "Tabloid", "label": "Tabloid - 11 x 17 in" }`
Orientation	`orientation`	`string`	Select a value from the drop down menu:`portraitlandscape`
Width	`width`	`string`	Custom width (overrides 'Page Size').
Height	`height`	`string`	Custom height (overrides 'Page Size').
Top Margin	`top`	`string`	You need one if you want to display a header.
Bottom Margin	`bottom`	`string`	You need one if you want to display a footer.
Left	`left`	`string`	Left margin.
Right	`right`	`string`	Right margin.
Unit	`unit`	`string`	Select a value from the drop down menu:`{ "label": "Millimeters (Default)", "value": "mm" }{ "label": "Centimeters", "value": "cm" }{ "label": "Inches", "value": "in" }{ "label": "Pixels", "value": "px" }`
CSS Media Type	`cssMediaType`	`string`	Select a value from the drop down menu:`printscreen`
Optimize Layout	`optimizeLayout`	`boolean`	Set this to true if you want us to auto-optimize your layout. This helps static items on your page to only show up once, instead of on every page.
Lazy Load	`lazyLoad`	`boolean`	Set this to true if you want our software to wait for content to lazy load.
Wait Time	`waitTime`	`integer`	Time in milliseconds that you want our software to wait after the page is loaded. You typically use this when you have long running JavaScript for graphs and tables.
CSS	`css`	`string`	Use custom CSS to overwrite the default styles of your page.

Action Authentication#

HTML 2 PDF uses API keys for authentication. When you connect your HTML 2 PDF account, Pipedream securely stores the keys so you can easily authenticate to HTML 2 PDF APIs in both code and no-code steps.

About HTML 2 PDF#

Convert HTML to PDF without effort.

More Ways to Connect HTML 2 PDF + Google Calendar#

Other Popular Integrations#

Generate PDF with HTML 2 PDF API on New Cancelled Event from Google Calendar API

Google Calendar + HTML 2 PDF

Generate PDF with HTML 2 PDF API on New Created or Updated Event (Instant) from Google Calendar API

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