Reimplement in Kotlin

7 files changed, 217 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