Add support for the read half of the PR Review API

docs/src/main/tut/pull_request.md

@@ -11,6 +11,8 @@ with Github4s, you can:
 - [List pull requests](#list-pull-requests)
 - [List the files in a pull request](#list-the-files-in-a-pull-request)
 - [Create a pull request](#create-a-pull-request)
+- [List reviews](#list-pull-request-reviews)
+- [Get a review](#get-an-individual-review)
 
 The following examples assume the following imports and token:
 
@@ -128,6 +130,60 @@ createPullRequestIssue.exec[cats.Id, HttpResponse[String]]() match {
 
 See [the API doc](https://developer.github.com/v3/pulls/#create-a-pull-request) for full reference.
 
+# Review API
+
+## List pull request reviews
+
+You can list the reviews for a pull request using `listReviews`, it takes as arguments:
+
+- the repository coordinates (`owner` and `name` of the repository).
+- the pull request id.
+
+As an example, if we wanted to see all the reviews for pull request 139 of `47deg/github4s`:
+
+```tut:silent
+val listReviews = Github(accessToken).pullRequests.listReviews(
+  "47deg",
+  "github4s",
+  139)
+
+listReviews.exec[cats.Id, HttpResponse[String]]() match {
+  case Left(e) => println("Something went wrong: s{e.getMessage}")
+  case Right(r) => println(r.result)
+}
+```
+
+The `result` on the right is the matching [List[PullRequestReview]][pr-scala].
+
+See [the API doc](https://developer.github.com/v3/pulls/reviews/#list-reviews-on-a-pull-request) for full reference.
+
+## Get an individual review
+
+You can get an individual review for a pull request using `getReview`, it takes as arguments:
+
+- the repository coordinates (`owner` and `name` of the repository).
+- the pull request id.
+- the review id.
+
+As an example, if we wanted to see review 39355613 for pull request 139 of `47deg/github4s`:
+
+```tut:silent
+val review = Github(accessToken).pullRequests.getReview(
+  "47deg",
+  "github4s",
+  139,
+  39355613)
+
+review.exec[cats.Id, HttpResponse[String]]() match {
+  case Left(e) => println("Something went wrong: s{e.getMessage}")
+  case Right(r) => println(r.result)
+}
+```
+
+The `result` on the right is the matching [PullRequestReview][pr-scala].
+
+See [the API doc](https://developer.github.com/v3/pulls/reviews/#get-a-single-review) for full reference.
+
 As you can see, a few features of the pull request endpoint are missing. As a result, if you'd like
 to see a feature supported, feel free to create an issue and/or a pull request!
 

github4s/jvm/src/test/scala/github4s/unit/ApiSpec.scala

@@ -758,6 +758,48 @@ class ApiSpec
     response should be('left)
   }
 
+  "PullRequests >> List PullRequestReviews" should "return a list of reviews when valid data is provided" in {
+    val response = pullRequests.listReviews(
+      accessToken,
+      headerUserAgent,
+      validRepoOwner,
+      validRepoName,
+      validPullRequestNumber)
+    response should be('right)
+  }
+
+  it should "return an error when invalid data is passed" in {
+    val response = pullRequests.listReviews(
+      accessToken,
+      headerUserAgent,
+      validRepoOwner,
+      invalidRepoName,
+      validPullRequestNumber)
+    response should be('left)
+  }
+
+  "PullRequests >> Get PullRequestReview" should "return a single review when valid data is provided" in {
+    val response = pullRequests.getReview(
+      accessToken,
+      headerUserAgent,
+      validRepoOwner,
+      validRepoName,
+      validPullRequestNumber,
+      validPullRequestReviewNumber)
+    response should be('right)
+  }
+
+  it should "return an error when invalid data is passed" in {
+    val response = pullRequests.getReview(
+      accessToken,
+      headerUserAgent,
+      validRepoOwner,
+      invalidRepoName,
+      validPullRequestNumber,
+      validPullRequestReviewNumber)
+    response should be('left)
+  }
+
   "Issues >> List" should "return the expected issues when a valid owner/repo is provided" in {
     val response =
       issues.list(accessToken, headerUserAgent, validRepoOwner, validRepoName)

github4s/jvm/src/test/scala/github4s/utils/MockGithubApiServer.scala

@@ -598,29 +598,65 @@ trait MockGithubApiServer extends MockServerService with FakeResponses with Test
          """.stripMargin)))
     .respond(response.withStatusCode(createdStatusCode).withBody(validCreatePullRequest))
 
-  //Issues >> list
+  //PullRequests >> listReviews
   mockServer
     .when(
       request
         .withMethod("GET")
-        .withPath(s"/repos/$validRepoOwner/$validRepoName/issues")
+        .withPath(s"/repos/$validRepoOwner/$validRepoName/pulls/$validPullRequestNumber/reviews")
         .withHeader("Authorization", tokenHeader))
-    .respond(response.withStatusCode(okStatusCode).withBody(listIssuesValidResponse))
+    .respond(response.withStatusCode(okStatusCode).withBody(listReviewsValidResponse))
 
   mockServer
     .when(
       request
         .withMethod("GET")
-        .withPath(s"/repos/$validRepoOwner/$validRepoName/issues")
+        .withPath(s"/repos/$validRepoOwner/$validRepoName/pulls/$validPullRequestNumber/reviews")
         .withHeader(not("Authorization")))
     .respond(response.withStatusCode(unauthorizedStatusCode).withBody(unauthorizedResponse))
 
+  mockServer
+    .when(
+      request
+        .withMethod("GET")
+        .withPath(s"/repos/$validRepoOwner/$invalidRepoName/pulls/$validPullRequestNumber/reviews")
+        .withHeader("Authorization", tokenHeader))
+    .respond(response.withStatusCode(notFoundStatusCode).withBody(notFoundResponse))
+
+  //PullRequests >> getReview
+  mockServer
+    .when(
+      request
+        .withMethod("GET")
+        .withPath(
+          s"/repos/$validRepoOwner/$validRepoName/pulls/$validPullRequestNumber/reviews/$validPullRequestReviewNumber")
+        .withHeader("Authorization", tokenHeader))
+    .respond(response.withStatusCode(okStatusCode).withBody(getReviewValidResponse))
+
+  mockServer
+    .when(
+      request
+        .withMethod("GET")
+        .withPath(
+          s"/repos/$validRepoOwner/$invalidRepoName/pulls/$validPullRequestNumber/reviews/$validPullRequestReviewNumber")
+        .withHeader("Authorization", tokenHeader))
+    .respond(response.withStatusCode(notFoundStatusCode).withBody(notFoundResponse))
+
+  //Issues >> list
+  mockServer
+    .when(
+      request
+        .withMethod("GET")
+        .withPath(s"/repos/$validRepoOwner/$validRepoName/issues")
+        .withHeader("Authorization", tokenHeader))
+    .respond(response.withStatusCode(okStatusCode).withBody(listIssuesValidResponse))
+
   mockServer
     .when(
       request
         .withMethod("GET")
         .withPath(s"/repos/$validRepoOwner/$invalidRepoName/issues")
-        .withHeader(not("Authorization")))
+        .withHeader("Authorization", tokenHeader))
     .respond(response.withStatusCode(notFoundStatusCode).withBody(notFoundResponse))
 
   //Issues >> create
@@ -637,7 +673,7 @@ trait MockGithubApiServer extends MockServerService with FakeResponses with Test
       request
         .withMethod("POST")
         .withPath(s"/repos/$validRepoOwner/$validRepoName/issues")
-        .withHeader(not("Authorization")))
+        .withHeader("Authorization", tokenHeader))
     .respond(response.withStatusCode(unauthorizedStatusCode).withBody(unauthorizedResponse))
 
   mockServer

github4s/shared/src/main/scala/github4s/Decoders.scala

@@ -160,6 +160,14 @@ object Decoders {
     }
   }
 
+  implicit val decodePrrStatus: Decoder[PullRequestReviewState] =
+    Decoder.decodeString.map {
+      case "APPROVE" => PRRStateApprove
+      case "REQUEST_CHANGES" => PRRStateRequestChanges
+      case "COMMENTED" => PRRStateCommented
+      case "PENDING" => PRRStatePending
+    }
+
   implicit val decodeGist: Decoder[Gist] = Decoder.instance { c ⇒
     for {
       url         ← c.downField("url").as[String]

github4s/shared/src/main/scala/github4s/Encoders.scala

@@ -32,4 +32,6 @@ object Encoders {
     case d: CreatePullRequestData  => d.asJson
     case d: CreatePullRequestIssue => d.asJson
   }
+
+  implicit val encodePrrStatus: Encoder[PullRequestReviewState] = Encoder.encodeString.contramap(_.value)
 }

github4s/shared/src/main/scala/github4s/GithubAPIs.scala

@@ -315,4 +315,19 @@ class GHPullRequests(accessToken: Option[String] = None)(implicit O: PullRequest
       maintainerCanModify: Option[Boolean] = Some(true)
   ): GHIO[GHResponse[PullRequest]] =
     O.createPullRequest(owner, repo, newPullRequest, head, base, maintainerCanModify, accessToken)
+
+  def listReviews(
+      owner: String,
+      repo: String,
+      pullRequest: Int
+  ): GHIO[GHResponse[List[PullRequestReview]]] =
+    O.listPullRequestReviews(owner, repo, pullRequest, accessToken)
+
+  def getReview(
+      owner: String,
+      repo: String,
+      pullRequest: Int,
+      review: Int
+  ): GHIO[GHResponse[PullRequestReview]] =
+    O.getPullRequestReview(owner, repo, pullRequest, review, accessToken)
 }

github4s/shared/src/main/scala/github4s/api/PullRequests.scala

@@ -118,4 +118,42 @@ class PullRequests[C, M[_]](
     httpClient
       .post[PullRequest](accessToken, s"repos/$owner/$repo/pulls", headers, data.asJson.noSpaces)
   }
+
+  /**
+   * List pull request reviews.
+   *
+   * @param accessToken Token to identify the authenticated user
+   * @param headers Optional user header to include in the request
+   * @param owner Owner of the repo
+   * @param repo Name of the repo
+   * @param pullRequest ID number of the PR to get reviews for.
+   */
+  def listReviews(
+      accessToken: Option[String] = None,
+      headers: Map[String, String] = Map(),
+      owner: String,
+      repo: String,
+      pullRequest: Int): M[GHResponse[List[PullRequestReview]]] = {
+    httpClient.get[List[PullRequestReview]](accessToken, s"repos/$owner/$repo/pulls/$pullRequest/reviews", headers)
+  }
+
+  /**
+   * Get a specific pull request review.
+   *
+   * @param accessToken Token to identify the authenticated user
+   * @param headers Optional user header to include in the request
+   * @param owner Owner of the repo
+   * @param repo Name of the repo
+   * @param pullRequest ID number of the PR to get reviews for
+   * @param review ID number of the review to retrieve.
+   */
+  def getReview(
+      accessToken: Option[String] = None,
+      headers: Map[String, String] = Map(),
+      owner: String,
+      repo: String,
+      pullRequest: Int,
+      review: Int): M[GHResponse[PullRequestReview]] = {
+    httpClient.get[PullRequestReview](accessToken, s"repos/$owner/$repo/pulls/$pullRequest/reviews/$review", headers)
+  }
 }

github4s/shared/src/main/scala/github4s/free/algebra/PullRequestOps.scala

@@ -49,6 +49,21 @@ final case class CreatePullRequest(
     accessToken: Option[String] = None
 ) extends PullRequestOp[GHResponse[PullRequest]]
 
+final case class ListPullRequestReviews(
+    owner: String,
+    repo: String,
+    pullRequest: Int,
+    accessToken: Option[String] = None
+) extends PullRequestOp[GHResponse[List[PullRequestReview]]]
+
+final case class GetPullRequestReview(
+    owner: String,
+    repo: String,
+    pullRequest: Int,
+    review: Int,
+    accessToken: Option[String] = None
+) extends PullRequestOp[GHResponse[PullRequestReview]]
+
 /**
  * Exposes Pull Request operations as a Free monadic algebra that may be combined with other
  * Algebras via Coproduct
@@ -83,6 +98,20 @@ class PullRequestOps[F[_]](implicit I: Inject[PullRequestOp, F]) {
     Free.inject[PullRequestOp, F](
       CreatePullRequest(owner, repo, newPullRequest, head, base, maintainerCanModify, accessToken))
 
+  def listPullRequestReviews(
+      owner: String,
+      repo: String,
+      pullRequest: Int,
+      accessToken: Option[String] = None): Free[F, GHResponse[List[PullRequestReview]]] =
+    Free.inject[PullRequestOp, F](ListPullRequestReviews(owner, repo, pullRequest, accessToken))
+
+  def getPullRequestReview(
+      owner: String,
+      repo: String,
+      pullRequest: Int,
+      review: Int,
+      accessToken: Option[String] = None): Free[F, GHResponse[PullRequestReview]] =
+    Free.inject[PullRequestOp, F](GetPullRequestReview(owner, repo, pullRequest, review, accessToken))
 }
 
 /**

github4s/shared/src/main/scala/github4s/free/domain/Issue.scala

@@ -28,7 +28,7 @@ case class Issue(
     html_url: String,
     number: Int,
     state: String,
-    user: User,
+    user: Option[User],
     assignee: Option[User],
     labels: List[Label] = List.empty,
     locked: Option[Boolean],
@@ -73,7 +73,7 @@ case class Comment(
     url: String,
     html_url: String,
     body: String,
-    user: User,
+    user: Option[User],
     created_at: String,
     updated_at: String)
 

github4s/shared/src/main/scala/github4s/free/domain/PullRequest.scala

@@ -37,7 +37,7 @@ case class PullRequestBase(
     label: Option[String],
     ref: String,
     sha: String,
-    user: User,
+    user: Option[User],
     repo: Option[Repository])
 
 case class PullRequestFile(
@@ -101,3 +101,18 @@ case object PRFilterOrderDesc extends PRFilterDirection("desc")
 sealed trait NewPullRequest
 case class NewPullRequestData(title: String, body: String) extends NewPullRequest
 case class NewPullRequestIssue(issue: Int)                 extends NewPullRequest
+
+case class PullRequestReview(
+    id: Int,
+    user: Option[User],
+    body: String,
+    commit_id: String,
+    state: PullRequestReviewState,
+    html_url: String,
+    pull_request_url: String)
+
+sealed abstract class PullRequestReviewState(val value: String)
+case object PRRStateApprove        extends PullRequestReviewState("APPROVE")
+case object PRRStateRequestChanges extends PullRequestReviewState("REQUEST_CHANGES")
+case object PRRStateCommented      extends PullRequestReviewState("COMMENTED")
+case object PRRStatePending        extends PullRequestReviewState("PENDING")

github4s/shared/src/main/scala/github4s/free/interpreters/Interpreters.scala

@@ -309,6 +309,10 @@ class Interpreters[M[_], C](
                 head,
                 base,
                 maintainerCanModify)
+          case ListPullRequestReviews(owner, repo, pullRequest, accessToken) ⇒
+            pullRequests.listReviews(accessToken, headers, owner, repo, pullRequest)
+          case GetPullRequestReview(owner, repo, pullRequest, review, accessToken) ⇒
+            pullRequests.getReview(accessToken, headers, owner, repo, pullRequest, review)
         }
       }
     }