From 48e79e6c2e91a20c38a4c1fd45dc672abdb9a944 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B8rgen=20Sverre=20Lien=20Sell=C3=A6g?=
 <jorgen.sellag@ibooking.no>
Date: Sat, 29 May 2021 13:01:37 +0200
Subject: [PATCH] working scrape based on directly on facebooks internal api

---
 src/facebook-api.js | 55 ++++++++++++++++++++++++++++++---------------
 src/logic.js        | 10 +++++++++
 2 files changed, 47 insertions(+), 18 deletions(-)

diff --git a/src/facebook-api.js b/src/facebook-api.js
index bf16395..83de9e6 100644
--- a/src/facebook-api.js
+++ b/src/facebook-api.js
@@ -3,12 +3,15 @@ const {
   map_event,
   get_past_events_from_page,
   get_upcoming_events_from_page,
+  get_page_info,
+  get_edges,
+  sleep,
 } = require('./logic');
 const fetch = require('node-fetch');
 
-const defaultRes = { edges: [] };
+const last = require('ramda/src/last');
 
-const get_past_events = async () => defaultRes;
+const get_past_events = async () => [];
 
 const fetch_upcoming_events = async (page_id, cursor = null) => {
   const params = new URLSearchParams();
@@ -19,11 +22,13 @@ const fetch_upcoming_events = async (page_id, cursor = null) => {
     cacheBreaker: 0,
   };
 
-  if (cursor !== null) {
-    variables = { ...variables, count: 3, cursor };
+  if (cursor === null) {
+    params.append('doc_id', '3636086023161977');
+  } else {
+    params.append('doc_id', '3911675102281316');
+    variables = { ...variables, count: 20, cursor };
   }
 
-  params.append('doc_id', '3636086023161977');
   params.append('variables', JSON.stringify(variables));
 
   const fetch_options = {
@@ -34,34 +39,52 @@ const fetch_upcoming_events = async (page_id, cursor = null) => {
     method: 'POST',
   };
 
-  let res = defaultRes;
+  let res = null;
 
   try {
     res = await fetch(graphql_endpoint, fetch_options);
   } catch (e) {
     console.error(e);
-    return defaultRes;
+    return null;
   }
 
   if (!res.ok) {
-    return defaultRes;
+    return null;
   }
 
   try {
     res = await res.json();
-  } catch (e) {}
-  return res;
+  } catch (e) {
+    console.error(e);
+    return null;
+  }
+
+  return get_upcoming_events_from_page(res);
 };
 
 const get_upcoming_events = async (page_id) => {
-  return defaultRes;
+  let next = true;
+  let cursor;
+  let edges = [];
+  while (next) {
+    const res = await fetch_upcoming_events(page_id, cursor);
+    edges = [...edges, ...get_edges(res)];
+    const { has_next_page } = get_page_info(res);
+    next = has_next_page;
+    cursor = last(edges).cursor;
+    if (has_next_page === true) {
+      await sleep(2);
+    }
+  }
+
+  return edges;
 };
 
 const get_reoccuring_events = () => {};
 
 const get_page_events = async (opt) => {
-  let past_events = defaultRes;
-  let upcoming_events = defaultRes;
+  let past_events = [];
+  let upcoming_events = [];
   const { page_id } = opt;
 
   if (opt.get_past_events) {
@@ -73,11 +96,7 @@ const get_page_events = async (opt) => {
     console.log(upcoming_events);
   }
 
-  const responses = [upcoming_events, past_events];
-  const nodes = responses.reduce(
-    (res, current) => [...res, ...current.edges],
-    [],
-  );
+  const nodes = [...upcoming_events, ...past_events];
 
   return nodes.map(map_event);
 };
diff --git a/src/logic.js b/src/logic.js
index ea189ac..c07e40f 100644
--- a/src/logic.js
+++ b/src/logic.js
@@ -76,6 +76,11 @@ const get_upcoming_events_from_page = pathOr(null, [
   'upcoming_events',
 ]);
 
+const get_page_info = pathOr({ end_cursor: null, has_next_page: false }, [
+  'page_info',
+]);
+const get_edges = pathOr([], ['edges']);
+
 const get_past_events_from_page = pathOr(null, ['data', 'page', 'past_events']);
 
 const to_unique_events = (acc, current) => [
@@ -155,6 +160,8 @@ const event_date_to_date_obj = (event) => {
   return event;
 };
 
+const sleep = (s) => new Promise((res) => setTimeout(res, s * 1000));
+
 module.exports = {
   by_date,
   event_date_to_date_obj,
@@ -162,9 +169,12 @@ module.exports = {
   get_upcoming_events_from_page,
   has_past_events,
   has_upcoming_events,
+  get_page_info,
+  get_edges,
   map_event,
   parse_args,
   read_previous_events,
   to_unique_events,
   write_events,
+  sleep,
 };