Merge pull request #131 from yundi-fu/feature/auto-height

Feature: ✌️added option for full page pdf rendering ✌️

Author: kimmobrunfeldt

README.md

@@ -195,6 +195,7 @@ pdf.pageRanges | string | - | Paper ranges to print, e.g., '1-5, 8, 11-13'. Defa
 pdf.format | string | `A4` | Paper format. If set, takes priority over width or height options.
 pdf.width | string | - | Paper width, accepts values labeled with units.
 pdf.height | string | - | Paper height, accepts values labeled with units.
+pdf.fullPage | boolean | - | Create PDF in a single page
 pdf.margin.top | string | - | Top margin, accepts values labeled with units.
 pdf.margin.right | string | - | Right margin, accepts values labeled with units.
 pdf.margin.bottom | string | - | Bottom margin, accepts values labeled with units.

src/core/render-core.js

@@ -24,6 +24,20 @@ async function createBrowser(opts) {
   return puppeteer.launch(browserOpts);
 }
 
+async function getFullPageHeight(page) {
+  const height = await page.evaluate(() => {
+    const { body, documentElement } = document;
+    return Math.max(
+      body.scrollHeight,
+      body.offsetHeight,
+      documentElement.clientHeight,
+      documentElement.scrollHeight,
+      documentElement.offsetHeight
+    );
+  });
+  return height;
+}
+
 async function render(_opts = {}) {
   const opts = _.merge({
     cookies: [],
@@ -50,7 +64,7 @@ async function render(_opts = {}) {
     failEarly: false,
   }, _opts);
 
-  if (_.get(_opts, 'pdf.width') && _.get(_opts, 'pdf.height')) {
+  if ((_.get(_opts, 'pdf.width') && _.get(_opts, 'pdf.height')) || _.get(opts, 'pdf.fullPage')) {
     // pdf.format always overrides width and height, so we must delete it
     // when user explicitly wants to set width and height
     opts.pdf.format = undefined;
@@ -154,6 +168,10 @@ async function render(_opts = {}) {
     }
 
     if (opts.output === 'pdf') {
+      if (opts.pdf.fullPage) {
+        const height = await getFullPageHeight(page);
+        opts.pdf.height = height;
+      }
       data = await page.pdf(opts.pdf);
     } else if (opts.output === 'html') {
       data = await page.evaluate(() => document.body.innerHTML);

src/http/render-http.js

@@ -157,6 +157,7 @@ function getOptsFromQuery(query) {
       waitUntil: query['goto.waitUntil'],
     },
     pdf: {
+      fullPage: query['pdf.fullPage'],
       scale: query['pdf.scale'],
       displayHeaderFooter: query['pdf.displayHeaderFooter'],
       footerTemplate: query['pdf.footerTemplate'],

src/middleware/error-responder.js

@@ -1,7 +1,7 @@
 const http = require('http');
 const _ = require('lodash');
 
-// This reponder is assuming that all <500 errors are safe to be responded
+// This responder is assuming that all <500 errors are safe to be responded
 // with their .message attribute.
 // DO NOT write sensitive data into error messages.
 function createErrorResponder(_opts) {

src/util/validation.js

@@ -46,6 +46,7 @@ const sharedQuerySchema = Joi.object({
   'pdf.format': Joi.string().min(1).max(2000),
   'pdf.width': Joi.string().min(1).max(2000),
   'pdf.height': Joi.string().min(1).max(2000),
+  'pdf.fullPage': Joi.boolean(),
   'pdf.footerTemplate': Joi.string(),
   'pdf.headerTemplate': Joi.string(),
   'pdf.margin.top': Joi.string().min(1).max(2000),
@@ -101,6 +102,7 @@ const renderBodyObject = Joi.object({
     format: Joi.string().min(1).max(2000),
     width: Joi.string().min(1).max(2000),
     height: Joi.string().min(1).max(2000),
+    fullPage: Joi.boolean(),
     footerTemplate: Joi.string(),
     headerTemplate: Joi.string(),
     margin: Joi.object({