Reimplement in Kotlin

14 files changed, 543 insertions, 0 deletions

diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/RedditLiteApplication.kt b/src/main/kotlin/io/jamesbarnett/redditlite/RedditLiteApplication.kt
new file mode 100644
index 0000000..b6d7f4c
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/RedditLiteApplication.kt
@@ -0,0 +1,11 @@
+package io.jamesbarnett.redditlite
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class RedditLiteApplication
+
+fun main(args: Array<String>) {
+	runApplication<RedditLiteApplication>(*args)
+}
diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/controller/LandingPageController.kt b/src/main/kotlin/io/jamesbarnett/redditlite/controller/LandingPageController.kt
new file mode 100644
index 0000000..c2881bd
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/controller/LandingPageController.kt
@@ -0,0 +1,13 @@
+package io.jamesbarnett.redditlite.controller
+
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.servlet.ModelAndView
+
+@Controller
+class LandingPageController {
+  @GetMapping("/")
+  fun renderLandingPage() : ModelAndView {
+    return ModelAndView("landing")
+  }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/controller/SubredditController.kt b/src/main/kotlin/io/jamesbarnett/redditlite/controller/SubredditController.kt
new file mode 100644
index 0000000..182d269
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/controller/SubredditController.kt
@@ -0,0 +1,37 @@
+package io.jamesbarnett.redditlite.controller
+
+import io.jamesbarnett.redditlite.service.SubredditService
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
+import org.springframework.web.servlet.ModelAndView
+
+@Controller
+@RequestMapping("/r")
+class SubredditController (val subredditService: SubredditService) {
+
+  @GetMapping("/{subreddit}")
+  fun renderPosts(@PathVariable subreddit: String,
+                  @RequestParam("after", required = false) postAfterId: String?,
+                  @RequestParam("showThumbs", defaultValue = "true") showThumbs: Boolean
+  ): ModelAndView {
+    val posts = subredditService.getPosts(subreddit, postAfterId)
+    return ModelAndView("posts")
+        .addObject("showThumbs", showThumbs)
+        .addObject("postAfterId", postAfterId)
+        .addObject("subreddit", subreddit)
+        .addObject("posts", posts)
+        .addObject("nextPostId", posts.last().name)
+  }
+
+  @GetMapping("/{subreddit}/comments/{postId}")
+  fun renderPostDetail(@PathVariable subreddit: String, @PathVariable postId: String): ModelAndView {
+    val postDetail = subredditService.getPostDetail(subreddit, postId)
+    return ModelAndView("postDetail")
+        .addObject("subreddit", subreddit)
+        .addObject("postDetail", postDetail)
+  }
+}
+
diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/model/Comment.kt b/src/main/kotlin/io/jamesbarnett/redditlite/model/Comment.kt
new file mode 100644
index 0000000..219270d
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/model/Comment.kt
@@ -0,0 +1,44 @@
+package io.jamesbarnett.redditlite.model
+
+import com.fasterxml.jackson.annotation.JsonIgnore
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.fasterxml.jackson.databind.JsonNode
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.github.marlonlom.utilities.timeago.TimeAgo
+import org.apache.commons.text.StringEscapeUtils
+import java.time.Instant
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+data class Comment(
+  val author: String?,
+  val score: Int,
+  @JsonProperty("is_submitter")
+  val isSubmitter: Boolean,
+  @JsonProperty("created_utc")
+  val createdDate: Instant?,
+  @JsonProperty("author_flair_text")
+  val flairText: String?,
+  val body: String?,
+  @JsonProperty("body_html")
+  val bodyHtml: String?,
+  val depth: Int,
+  @JsonIgnore
+  val replies: MutableList<Comment> = mutableListOf()
+) {
+  companion object {
+    operator fun invoke(jsonNode: JsonNode, objectMapper: ObjectMapper): Comment {
+      val topLevelComment = objectMapper.treeToValue(jsonNode, Comment::class.java)
+      jsonNode
+        .path("replies")
+        .path("data")
+        .path("children")
+        .findValues("data")
+        .forEach {topLevelComment.replies.add(invoke(it, objectMapper))}
+      return topLevelComment
+    }
+  }
+  val isChild get() = depth > 0
+  val relativeCreatedDate: String? get() = createdDate?.let { TimeAgo.using(createdDate.toEpochMilli()) }
+  val bodyHtmlUnescaped: String? get() = StringEscapeUtils.unescapeHtml4(bodyHtml)
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/model/Post.kt b/src/main/kotlin/io/jamesbarnett/redditlite/model/Post.kt
new file mode 100644
index 0000000..4cd723d
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/model/Post.kt
@@ -0,0 +1,41 @@
+package io.jamesbarnett.redditlite.model
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.github.marlonlom.utilities.timeago.TimeAgo
+import java.time.Instant
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+data class Post (
+  val id: String,
+  val name: String,
+  val title: String,
+  val domain: String,
+  val score: Int,
+  val author: String,
+  private val thumbnail: String?,
+  val ups: Int,
+  @JsonProperty("num_comments")
+  val commentCount: Int,
+  val url: String,
+  @JsonProperty("created_utc")
+  val createdDate: Instant,
+  @JsonProperty("is_self")
+  val isSelfPost: Boolean,
+  @JsonProperty("selftext_html")
+  val selftextHtml: String?,
+  val subreddit: String
+) {
+  val primaryLink: String get() {
+    return if (isSelfPost) {
+      "/r/${subreddit}/comments/${id}"
+    } else {
+      url
+    }
+  }
+  val subredditPath get() = "/r/${subreddit}"
+  val relativeCreatedDate: String get() = TimeAgo.using(createdDate.toEpochMilli())
+  val thumbnailUrl get() = thumbnail?.let { if(thumbnail.startsWith("http")) thumbnail else null }
+//val thumbnail get() = if(thumbnailRaw?.startsWith("http") == true) thumbnailRaw else null
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/model/PostDetail.kt b/src/main/kotlin/io/jamesbarnett/redditlite/model/PostDetail.kt
new file mode 100644
index 0000000..c5b58f0
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/model/PostDetail.kt
@@ -0,0 +1,9 @@
+package io.jamesbarnett.redditlite.model
+
+import org.apache.commons.text.StringEscapeUtils
+
+data class PostDetail(val post: Post, val comments: List<Comment>) {
+  val isSelfPost get() = post.isSelfPost
+  val selftextHtmlUnescaped: String? get() = StringEscapeUtils.unescapeHtml4(post.selftextHtml)
+  val commentCount get() = post.commentCount
+}
diff --git a/src/main/kotlin/io/jamesbarnett/redditlite/service/SubredditService.kt b/src/main/kotlin/io/jamesbarnett/redditlite/service/SubredditService.kt
new file mode 100644
index 0000000..8c01c93
--- /dev/null
+++ b/src/main/kotlin/io/jamesbarnett/redditlite/service/SubredditService.kt
@@ -0,0 +1,62 @@
+package io.jamesbarnett.redditlite.service
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.fasterxml.jackson.module.kotlin.treeToValue
+import io.jamesbarnett.redditlite.model.Comment
+import io.jamesbarnett.redditlite.model.Post
+import io.jamesbarnett.redditlite.model.PostDetail
+import org.springframework.boot.web.client.RestTemplateBuilder
+import org.springframework.stereotype.Service
+import org.springframework.web.client.RestTemplate
+import java.time.Duration
+
+const val REDDIT_API_ROOT_URL = "https://reddit.com/r/"
+
+@Service
+class SubredditService (restTemplateBuilder: RestTemplateBuilder) {
+
+  val objectMapper: ObjectMapper = jacksonObjectMapper()
+      .registerModule(JavaTimeModule())
+
+  val restTemplate: RestTemplate = restTemplateBuilder
+      .setConnectTimeout(Duration.ofSeconds(5))
+      .setReadTimeout(Duration.ofSeconds(10))
+      // Custom UA required to prevent rate limiting: https://github.com/reddit-archive/reddit/wiki/API#rules
+      .defaultHeader("User-Agent", "reddit-lite")
+      .build()
+
+  fun getPosts(subreddit: String, postsAfterId: String?): List<Post> {
+    val jsonResponse = restTemplate.getForObject("${REDDIT_API_ROOT_URL}${subreddit}/.json${if (postsAfterId != null) "?after=${postsAfterId}" else ""}", String::class.java)
+    return objectMapper.readTree(jsonResponse)
+      .path("data")
+      .path("children")
+      .findValues("data")
+      .map { objectMapper.treeToValue(it, Post::class.java) }
+  }
+
+  fun getPostDetail(subreddit: String, postId: String): PostDetail {
+    val jsonResponse = restTemplate.getForObject("${REDDIT_API_ROOT_URL}${subreddit}/comments/${postId}/.json", String::class.java)
+    val rootNode = objectMapper.readTree(jsonResponse)
+
+    val post = objectMapper.treeToValue(
+      rootNode
+        .path(0)
+        .path("data")
+        .path("children")
+        .path(0)
+        .path("data"),
+      Post::class.java)
+
+    val comments = rootNode
+      .path(1)
+      .path("data")
+      .path("children")
+      .findValues("data")
+      .map { Comment(it, objectMapper) }
+
+    return PostDetail(post, comments)
+  }
+
+}
\ No newline at end of file
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..4d1b8ec
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1 @@
+spring.freemarker.settings.template_exception_handler=rethrow
diff --git a/src/main/resources/static/stylesheets/style.css b/src/main/resources/static/stylesheets/style.css
new file mode 100644
index 0000000..c561bb7
--- /dev/null
+++ b/src/main/resources/static/stylesheets/style.css
@@ -0,0 +1,143 @@
+html {
+  -webkit-text-size-adjust: 100%;
+}
+
+body {
+  font-family: Verdana, Geneva, sans-serif;
+  font-size: 10pt;
+}
+
+p {
+  margin: 5pt 0pt;
+}
+
+.header {
+  background-color: #c0c0c0;
+  display: table;
+}
+
+.subreddit-title {
+  font-weight: bold;
+  font-size: 15pt;
+  padding: 4pt 10pt;
+  display: table-cell;
+  vertical-align: middle;
+  text-decoration: none;
+  color: #000000;
+  white-space: nowrap;
+}
+
+.header-links {
+  display: table-cell;
+  vertical-align: middle;
+  width: 100%;
+}
+
+.header-links a {
+  color: #000000;
+}
+
+.post-list {
+  display: table;
+  border-spacing: 5pt;
+}
+
+.no-list-style {
+  list-style-type: none;
+  padding: 0;
+  margin: 0;
+}
+
+.post {
+  color: #828282;
+  display: table-row;
+}
+
+.post-body {
+  display: table-cell;
+  vertical-align: top;
+}
+
+.post-thumbnail {
+  display: table-cell;
+  vertical-align: top;
+  width: 100px;
+  height: auto;
+}
+
+.post-title {
+  color: #000000;
+  text-decoration: none;
+}
+
+.post-domain {
+  font-size: 8pt;
+}
+
+.post-info {
+  font-size: 7pt;
+}
+
+.nowrap {
+  white-space: nowrap;
+}
+
+.next-page-link {
+  padding: 10pt;
+}
+
+.post-summary {
+  padding: 10pt 5pt;
+}
+
+.subreddit-link {
+  color: #828282;
+}
+
+.post-selftext {
+  padding: 0pt 15pt;
+}
+
+.comments {
+  padding: 10pt 5pt;
+}
+
+.comment-heading {
+  padding-left: 5pt;
+}
+
+.comment {
+  margin-bottom: 10pt;
+}
+
+.comment.child {
+  margin-left: 10pt;
+}
+
+.comment-details {
+  font-size: 8pt;
+  color: #828282;
+}
+
+summary {
+  outline: none;
+  margin-bottom: -5pt;
+}
+
+blockquote {
+  background: #f9f9f9;
+  border-left: 5pt solid #ccc;
+  margin: 10pt 10pt 5pt;
+  padding: 2pt 10pt;
+}
+
+pre {
+  background: #f9f9f9;
+  font-size: 8pt;
+  padding: 2pt 10pt;
+}
+
+.landing-desc {
+  padding: 10pt 5pt;
+  font-size: 10pt;
+}
\ No newline at end of file
diff --git a/src/main/resources/templates/landing.ftlh b/src/main/resources/templates/landing.ftlh
new file mode 100644
index 0000000..4e99c17
--- /dev/null
+++ b/src/main/resources/templates/landing.ftlh
@@ -0,0 +1,58 @@
+<#include 'lib.ftlh'>
+
+<@wrapper title="Reddit-lite">
+  <div class="header">
+    <a class="subreddit-title">reddit-lite</a>
+    <span class="header-links"> </span>
+  </div>
+  <div class="landing-desc">
+    <p>
+      A lightweight, minimal, readonly Reddit client, designed for mobile devices or slow connections. Source is available on <a href="https://github.com/jamesbarnett91/reddit-lite">GitHub</a>.
+    </p>
+    <div>
+      Navigate to /r/&lt;subreddit> or try some of the examples below:
+      <ul>
+        <li>
+          <a href="/r/popular">Reddit frontpage (popular subreddits)</a>
+        </li>
+        <li>
+          <a href="/r/programming">/r/programming</a>
+        </li>
+        <li>
+          <a href="/r/webdev">/r/webdev</a>
+        </li>
+        <li>
+          <a href="/r/videos">/r/videos</a>
+        </li>
+        <li>
+          <a href="/r/youtubehaiku">/r/youtubehaiku</a>
+        </li>
+        <li>
+          <a href="/r/worldnews">/r/worldnews/</a>
+        </li>
+        <li>
+          <a href="/r/food">/r/food</a>
+        </li>
+      </ul>
+    </div>
+    <p>You can also paste any Reddit link (post or comment) here to view the corresponding page in this client</p>
+    <input id="reddit-link" placeholder="https://reddit.com/r/example/comments/1jke3nj2/some_example_post"> </input> <button id="view-link">view in reddit-lite</button>
+    <p id="link-error" hidden >specified link does not contain "reddit.com"</p>
+  </div>
+
+  <script>
+    document.addEventListener("DOMContentLoaded", function() {
+      document.getElementById("view-link").onclick = function(e) {
+        var link = document.getElementById("reddit-link").value;
+        var linkTokens = link.split("reddit.com");
+        if(linkTokens.length === 2) {
+          window.location = linkTokens[1];
+        }
+        else {
+          document.getElementById("link-error").removeAttribute('hidden');
+        }
+      }
+    });
+  </script>
+
+</@wrapper>
\ No newline at end of file
diff --git a/src/main/resources/templates/lib.ftlh b/src/main/resources/templates/lib.ftlh
new file mode 100644
index 0000000..9b9e96b
--- /dev/null
+++ b/src/main/resources/templates/lib.ftlh
@@ -0,0 +1,62 @@
+<#macro wrapper title>
+<html>
+  <head>
+    <title>${title}</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
+  </head>
+  <body>
+    <#nested>
+  </body>
+</html>
+</#macro>
+
+<#macro header subreddit>
+  <div class="header">
+    <a class="subreddit-title" href="/r/${subreddit}">/r/${subreddit}</a>
+    <span class="header-links">
+      <#nested>
+    </span>
+  </div>
+</#macro>
+
+<#macro postSummary post>
+  <div class="post-body">
+    <div>
+      <a class="post-title" href="${post.primaryLink}">${post.title}</a>
+      <span class="post-domain">(${post.domain})</span>
+    </div>
+    <div class="post-info">
+      <span class="nowrap"><@pluralise post.score "point"/></span>
+      <span class="nowrap">by ${post.author}</span>
+      <span class="nowrap"> in <a class="subreddit-link" href="${post.subredditPath}">${post.subredditPath}</a></span>
+      <span class="nowrap">${post.relativeCreatedDate}</span> | <span class="nowrap"><a href="${post.subredditPath}/comments/${post.id}"><@pluralise post.commentCount, "comment"/></a></span>
+    </div>
+  </div>
+</#macro>
+
+<#macro postComment comment>
+  <div class="comment<#if comment.isChild()> child</#if>">
+    <#if comment.author?has_content>
+      <details open>
+        <summary>
+          <span class="comment-details">${comment.author} <#if comment.flairText?has_content>${comment.flairText}</#if> | ${comment.relativeCreatedDate} | <@pluralise comment.score "point"/></span>
+        </summary>
+        <div class="comment-text">${comment.bodyHtmlUnescaped?no_esc}</div>
+        <#list comment.replies as childComment>
+          <@postComment childComment/>
+        </#list>
+      </details>
+    <#else>
+      <a href="#">TODO Load more comments...</a>
+    </#if>
+  </div>
+</#macro>
+
+<#macro pluralise count word>
+  <#if count == 1>
+    ${count} ${word}
+  <#else>
+    ${count} ${word}s
+  </#if>
+</#macro>
\ No newline at end of file
diff --git a/src/main/resources/templates/postDetail.ftlh b/src/main/resources/templates/postDetail.ftlh
new file mode 100644
index 0000000..576e6e1
--- /dev/null
+++ b/src/main/resources/templates/postDetail.ftlh
@@ -0,0 +1,19 @@
+<#include 'lib.ftlh'>
+
+<@wrapper title="/r/${subreddit}">
+  <@header subreddit/>
+
+  <div class="post-summary">
+    <@postSummary postDetail.post/>
+  </div>
+
+  ${(postDetail.selftextHtmlUnescaped?no_esc)!""}
+
+  <div class="comment-heading"><@pluralise postDetail.commentCount, "comment"/></div>
+  <div class="comments">
+    <#list postDetail.comments as comment>
+      <@postComment comment/>
+    </#list>
+  </div>
+
+</@wrapper>
\ No newline at end of file
diff --git a/src/main/resources/templates/posts.ftlh b/src/main/resources/templates/posts.ftlh
new file mode 100644
index 0000000..56dbd1b
--- /dev/null
+++ b/src/main/resources/templates/posts.ftlh
@@ -0,0 +1,30 @@
+<#include 'lib.ftlh'>
+
+<@wrapper title="/r/${subreddit}">
+  <#assign thumbnailUrlFragment>/r/${subreddit}?after=${postAfterId!}&showThumbs=</#assign>
+  <@header subreddit>
+    <#if showThumbs>
+      <a href='${thumbnailUrlFragment}false'>hide thumbnails</a>
+    <#else>
+      <a href='${thumbnailUrlFragment}true'>show thumbnails</a>
+    </#if>
+  </@header>
+
+  <ol class="post-list no-list-style">
+    <#list posts as post>
+      <li>
+        <div class="post">
+          <#if showThumbs && !post.isSelfPost() && post.thumbnailUrl?has_content>
+            <a class="post-title" href="${post.primaryLink}">
+              <img src="${post.thumbnailUrl}" class="post-thumbnail"> </img>
+            </a>
+          </#if>
+          <@postSummary post/>
+        </div>
+      </li>
+    </#list>
+  </ol>
+
+  <a class="next-page-link" href="/r/${subreddit}?after=${nextPostId}&showThumbs=${showThumbs?c}">next page ></a>
+
+</@wrapper>
\ No newline at end of file
diff --git a/src/test/kotlin/io/jamesbarnett/redditlite/RedditLiteApplicationTests.kt b/src/test/kotlin/io/jamesbarnett/redditlite/RedditLiteApplicationTests.kt
new file mode 100644
index 0000000..766a49f
--- /dev/null
+++ b/src/test/kotlin/io/jamesbarnett/redditlite/RedditLiteApplicationTests.kt
@@ -0,0 +1,13 @@
+package io.jamesbarnett.redditlite
+
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class RedditLiteApplicationTests {
+
+	@Test
+	fun contextLoads() {
+	}
+
+}