Fix #1459: Added Post and Posts to NextJS

src/frontend/next/src/components/AdminButtons.tsx

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+const AdminButtons = () => <h3> AdminButtons</h3>;
+
+export default AdminButtons;

src/frontend/next/src/components/Post/index.tsx

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+import { useRef, useState } from 'react';
+import useSWR from 'swr';
+import { makeStyles, Theme } from '@material-ui/core/styles';
+import { Box, Grid, Typography, ListSubheader, createStyles } from '@material-ui/core';
+import ErrorRoundedIcon from '@material-ui/icons/ErrorRounded';
+import { Post } from '../../interfaces';
+import AdminButtons from '../AdminButtons';
+import Spinner from '../Spinner';
+
+type Props = {
+  postUrl: string;
+};
+
+const useStyles = makeStyles((theme: Theme) =>
+  createStyles({
+    root: {
+      padding: 0,
+      fontSize: '1.5rem',
+      marginBottom: '4em',
+    },
+    header: {
+      backgroundColor: theme.palette.primary.main,
+      color: theme.palette.text.secondary,
+      padding: '2em 3em 2em 3em',
+      lineHeight: '1.3',
+      zIndex: 1100,
+      top: '-1.1em',
+      [theme.breakpoints.down(1440)]: {
+        paddingTop: '1.6em',
+        paddingBottom: '1.5em',
+      },
+      [theme.breakpoints.down(1065)]: {
+        position: 'static',
+      },
+    },
+    expandHeader: {
+      whiteSpace: 'normal',
+      cursor: 'pointer',
+    },
+    collapseHeader: {
+      whiteSpace: 'nowrap',
+      cursor: 'pointer',
+    },
+    title: {
+      fontSize: '3.5em',
+      fontWeight: 'bold',
+      overflow: 'hidden',
+      textOverflow: 'ellipsis',
+      [theme.breakpoints.between('xs', 'sm')]: {
+        fontSize: '2.5em',
+      },
+    },
+    author: {
+      fontSize: '1.5em',
+      fontWeight: 'bold',
+      color: theme.palette.primary.contrastText,
+      [theme.breakpoints.between('xs', 'sm')]: {
+        fontSize: '1.2em',
+      },
+    },
+    published: {
+      fontSize: '1.2em',
+      textDecoration: 'none',
+      color: theme.palette.primary.contrastText,
+      [theme.breakpoints.between('xs', 'sm')]: {
+        fontSize: '1em',
+      },
+    },
+    content: {
+      overflow: 'auto',
+      padding: '2em',
+      color: theme.palette.text.primary,
+    },
+    link: {
+      textDecoration: 'none',
+      color: theme.palette.primary.contrastText,
+      '&:hover': {
+        textDecorationLine: 'underline',
+      },
+    },
+    time: {
+      '&:hover': {
+        textDecorationLine: 'underline',
+      },
+    },
+    spinner: {
+      padding: '20px',
+    },
+    error: {
+      lineHeight: '1.00',
+      fontSize: '1em',
+    },
+  })
+);
+
+const formatPublishedDate = (dateString: string) => {
+  const date = new Date(dateString);
+  const options = { month: 'long', day: 'numeric', year: 'numeric' };
+  const formatted = new Intl.DateTimeFormat('en-CA', options).format(date);
+  return `Last Updated ${formatted}`;
+};
+
+const PostComponent = ({ postUrl }: Props) => {
+  const classes = useStyles();
+  // We need a ref to our post content, which we inject into a <section> below.
+  const sectionEl = useRef<HTMLElement>(null);
+  // Grab the post data from our backend so we can render it
+  const { data: post, error } = useSWR<Post>(postUrl);
+  const [expandHeader, setExpandHeader] = useState(false);
+
+  if (error) {
+    console.error(`Error loading post at ${postUrl}`, error);
+    return (
+      <Box className={classes.root} boxShadow={2}>
+        <ListSubheader className={classes.header}>
+          <AdminButtons />
+          <Typography variant="h1" className={classes.title}>
+            <Grid container className={classes.error}>
+              <Grid item>
+                <ErrorRoundedIcon className={classes.error} />
+              </Grid>{' '}
+              - Post Failed to Load
+            </Grid>
+          </Typography>
+        </ListSubheader>
+      </Box>
+    );
+  }
+
+  if (!post) {
+    return (
+      <Box className={classes.root} boxShadow={2}>
+        <ListSubheader className={classes.header}>
+          <AdminButtons />
+          <Typography variant="h1" className={classes.title}>
+            Loading Blog...
+          </Typography>
+        </ListSubheader>
+
+        <Grid container justify="center">
+          <Grid item className={classes.spinner}>
+            <Spinner />
+          </Grid>
+        </Grid>
+      </Box>
+    );
+  }
+
+  return (
+    <Box className={classes.root} boxShadow={2}>
+      <ListSubheader className={classes.header}>
+        <AdminButtons />
+        <Typography variant="h1" title={post.title} id={post.id} className={classes.title}>
+          <span
+            role="button"
+            tabIndex={0}
+            onClick={() => setExpandHeader(!expandHeader)}
+            onKeyDown={() => setExpandHeader(!expandHeader)}
+            className={expandHeader ? classes.expandHeader : classes.collapseHeader}
+          >
+            {post.title}
+          </span>
+        </Typography>
+        <Typography className={classes.author}>
+          &nbsp;By&nbsp;
+          <a className={classes.link} href={post.feed.url}>
+            {post.feed.author}
+          </a>
+        </Typography>
+        <a href={post.url} rel="bookmark" className={classes.published}>
+          <time className={classes.time} dateTime={post.updated}>
+            {` ${formatPublishedDate(post.updated)}`}
+          </time>
+        </a>
+      </ListSubheader>
+
+      <Grid container>
+        <Grid item xs={12} className={classes.content}>
+          <section
+            ref={sectionEl}
+            className="telescope-post-content"
+            dangerouslySetInnerHTML={{ __html: post.html }}
+          />
+        </Grid>
+      </Grid>
+    </Box>
+  );
+};
+
+export default PostComponent;

src/frontend/next/src/components/Posts/LoadAutoScroll.tsx

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+import { useEffect, createRef } from 'react';
+import { Container, Button, Grid, createStyles, Theme } from '@material-ui/core';
+import { makeStyles } from '@material-ui/core/styles';
+
+type Scroll = {
+  onScroll: Function;
+};
+
+const useStyles = makeStyles((theme: Theme) =>
+  createStyles({
+    content: {
+      '& > *': {
+        padding: theme.spacing(2),
+        bottom: theme.spacing(4),
+      },
+    },
+  })
+);
+
+function LoadAutoScroll({ onScroll }: Scroll) {
+  const classes = useStyles();
+  const $buttonRef = createRef<HTMLButtonElement>();
+  // This will make the automatic infinite scrolling feature
+  // Once the "button" is on the viewport(shown on the window),
+  // The new posts are updated(call onClick() -- setSize(size + 1) in Posts.jsx --)
+  useEffect(() => {
+    const options = {
+      root: null,
+      threshold: 1.0,
+    };
+
+    const observer = new IntersectionObserver(
+      (entries) =>
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            onScroll();
+          }
+        }),
+      options
+    );
+    observer.observe($buttonRef.current!);
+    const buttonRefCopy = $buttonRef.current;
+
+    return () => {
+      observer.unobserve(buttonRefCopy as HTMLButtonElement);
+    };
+  }, [$buttonRef, onScroll]);
+
+  return (
+    <Container>
+      <Grid item xs={12} className={classes.content}>
+        <Button ref={$buttonRef}>Load More Posts</Button>
+      </Grid>
+    </Container>
+  );
+}
+
+export default LoadAutoScroll;

src/frontend/next/src/components/Posts/Timeline.tsx

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+import { Container, createStyles, Grid } from '@material-ui/core';
+import { makeStyles, Theme } from '@material-ui/core/styles';
+import PostComponent from '../Post';
+import { Post } from '../../interfaces';
+import Spinner from '../Spinner';
+import LoadAutoScroll from './LoadAutoScroll';
+import useSiteMetaData from '../../hooks/use-site-metadata';
+
+type Props = {
+  pages: Post[][] | undefined;
+  nextPage: Function;
+};
+
+const useStyles = makeStyles((theme: Theme) =>
+  createStyles({
+    root: {
+      padding: 0,
+      maxWidth: '785px',
+    },
+    activeCircle: {
+      borderRadius: '4rem',
+      transition: 'all linear 250ms',
+      color: theme.palette.primary,
+    },
+  })
+);
+
+const Timeline = ({ pages, nextPage }: Props) => {
+  const classes = useStyles();
+  const { telescopeUrl } = useSiteMetaData();
+
+  if (!(pages && pages.length)) {
+    return (
+      <Grid container spacing={0} direction="column" alignItems="center" justify="center">
+        <Spinner />
+      </Grid>
+    );
+  }
+
+  // Iterate over all the pages (an array of arrays) and then convert all post
+  // elements to <Post>
+  const postsTimeline = pages.map((page: Post[]): any =>
+    page.map(({ id, url }: Post) => <PostComponent postUrl={`${telescopeUrl}${url}`} key={id} />)
+  );
+
+  // Add a "Load More" button at the end of the timeline.  Give it a unique
+  // key each time, based on page (i.e., size), so we remove the previous one
+  if (nextPage) {
+    postsTimeline.push(
+      <LoadAutoScroll onScroll={() => nextPage()} key={`load-more-button-${pages.length}`} />
+    );
+  }
+
+  return <Container className={classes.root}>{postsTimeline}</Container>;
+};
+
+export default Timeline;