From fef142f13a8f76d906c96131f063d19e3333a687 Mon Sep 17 00:00:00 2001
From: Maximilian Bosch <maximilian@mbosch.me>
Date: Tue, 30 Mar 2021 14:10:21 +0200
Subject: [PATCH] Implement simple status notifications for Git repos hosted on
 gitea

---
 doc/manual/src/projects.md          | 30 ++++++++++
 src/lib/Hydra/Plugin/GiteaStatus.pm | 88 +++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 src/lib/Hydra/Plugin/GiteaStatus.pm

diff --git a/doc/manual/src/projects.md b/doc/manual/src/projects.md
index c4ea8f55..3b9b8eb1 100644
--- a/doc/manual/src/projects.md
+++ b/doc/manual/src/projects.md
@@ -462,3 +462,33 @@ notifications, add it to the path option of the Hydra services in your
     systemd.services.hydra-queue-runner.path = [ pkgs.ssmtp ];
     systemd.services.hydra-server.path = [ pkgs.ssmtp ];
 
+Gitea Integration
+-----------------
+
+Hydra can notify Git servers (such as [GitLab](https://gitlab.com/), [GitHub](https://github.com)
+or [Gitea](https://gitea.io/en-us/)) about the result of a build from a Git checkout.
+
+This section describes how it can be implemented for `gitea`, but the approach for `gitlab` is
+analogous:
+
+* [Obtain an API token for your user](https://docs.gitea.io/en-us/api-usage/#authentication)
+* Add it to your `hydra.conf` like this:
+  ``` nix
+  {
+    services.hydra-dev.extraConfig = ''
+      <gitea_authorization>
+      your_username=your_token
+      </gitea_authorization>
+    '';
+  }
+  ```
+
+* For a jobset with a `Git`-input which points to a `gitea`-instance, add the following
+  additional inputs:
+
+  | Type           | Name                | Value                               |
+  | -------------- | ------------------- | ----------------------------------- |
+  | `String value` | `gitea_repo_name`   | *Name of the repository to build*   |
+  | `String value` | `gitea_repo_owner`  | *Owner of the repository*           |
+  | `String value` | `gitea_status_repo` | *Name of the `Git checkout` input*  |
+
diff --git a/src/lib/Hydra/Plugin/GiteaStatus.pm b/src/lib/Hydra/Plugin/GiteaStatus.pm
new file mode 100644
index 00000000..aa1994cf
--- /dev/null
+++ b/src/lib/Hydra/Plugin/GiteaStatus.pm
@@ -0,0 +1,88 @@
+package Hydra::Plugin::GiteaStatus;
+
+use strict;
+use parent 'Hydra::Plugin';
+
+use HTTP::Request;
+use JSON;
+use LWP::UserAgent;
+use Hydra::Helper::CatalystUtils;
+use List::Util qw(max);
+
+sub isEnabled {
+    my ($self) = @_;
+    return defined $self->{config}->{gitea_authorization};
+}
+
+sub toGiteaState {
+    # See https://try.gitea.io/api/swagger#/repository/repoCreateStatus
+    my ($status, $buildStatus) = @_;
+    if ($status == 0 || $status == 1) {
+        return "pending";
+    } elsif ($buildStatus == 0) {
+        return "success";
+    } else {
+        return "error";
+    }
+}
+
+sub common {
+    my ($self, $build, $dependents, $status) = @_;
+    my $baseurl = $self->{config}->{'base_uri'} || "http://localhost:3000";
+
+    # Find matching configs
+    foreach my $b ($build, @{$dependents}) {
+        my $jobName = showJobName $b;
+        my $evals = $build->jobsetevals;
+        my $ua = LWP::UserAgent->new();
+
+        # Don't send out "pending/running" status updates if the build is already finished
+        next if $status < 2 && $b->finished == 1;
+
+        my $state = toGiteaState($status, $b->buildstatus);
+        my $body = encode_json(
+            {
+                state => $state,
+                target_url => "$baseurl/build/" . $b->id,
+                description => "Hydra build #" . $b->id . " of $jobName",
+                context => "Hydra " . $b->get_column('job'),
+            });
+
+        while (my $eval = $evals->next) {
+            my $giteastatusInput = $eval->jobsetevalinputs->find({ name => "gitea_status_repo" });
+            next unless defined $giteastatusInput && defined $giteastatusInput->value;
+            my $i = $eval->jobsetevalinputs->find({ name => $giteastatusInput->value, altnr => 0 });
+            next unless defined $i;
+
+            my $repoOwner = $eval->jobsetevalinputs->find({ name => "gitea_repo_owner" })->value;
+            my $repoName = $eval->jobsetevalinputs->find({ name => "gitea_repo_name" })->value;
+            my $accessToken = $self->{config}->{gitea_authorization}->{$repoOwner};
+
+            my $rev = $i->revision;
+            my $domain = URI->new($i->uri)->host;
+            my $url = "http://$domain:3000/api/v1/repos/$repoOwner/$repoName/statuses/$rev";
+
+            print STDERR "GiteaStatus POSTing $state to $url\n";
+            my $req = HTTP::Request->new('POST', $url);
+            $req->header('Content-Type' => 'application/json');
+            $req->header('Authorization' => "token $accessToken");
+            $req->content($body);
+            my $res = $ua->request($req);
+            print STDERR $res->status_line, ": ", $res->decoded_content, "\n" unless $res->is_success;
+        }
+    }
+}
+
+sub buildQueued {
+    common(@_, [], 0);
+}
+
+sub buildStarted {
+    common(@_, [], 1);
+}
+
+sub buildFinished {
+    common(@_, 2);
+}
+
+1;