From f82ccb36691c49fb1c2fb6b599fbf18bf800f679 Mon Sep 17 00:00:00 2001
From: Arthur Zamarin <arthurzam@gentoo.org>
Date: Tue, 19 Mar 2024 16:44:44 +0200
Subject: app: add outdated feed for maintainer and category

Resolves: https://github.com/gentoo/soko/issues/23
Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>
---
 pkg/app/handler/categories/show.go                 | 12 +++++++++
 pkg/app/handler/maintainer/show.go                 | 17 +++++++++++++
 .../handler/packages/components/changelog.templ    |  2 +-
 pkg/app/handler/packages/components/outdated.templ |  9 ++++++-
 pkg/app/serve.go                                   |  1 +
 pkg/app/utils/outdated.go                          | 29 ++++++++++++++++++++++
 6 files changed, 68 insertions(+), 2 deletions(-)
 create mode 100644 pkg/app/utils/outdated.go

diff --git a/pkg/app/handler/categories/show.go b/pkg/app/handler/categories/show.go
index dcf3410..b48e37c 100644
--- a/pkg/app/handler/categories/show.go
+++ b/pkg/app/handler/categories/show.go
@@ -44,6 +44,18 @@ func Show(w http.ResponseWriter, r *http.Request) {
 		pageName = "Outdated"
 		query = query.Relation("Packages.Versions").
 			Relation("Packages.Outdated")
+	case "outdated.atom":
+		var outdated []models.OutdatedPackages
+		err := database.DBCon.Model(&outdated).
+			Where("SPLIT_PART(atom, '/', 1) = ?", categoryName).
+			Order("atom").
+			Select()
+		if err != nil {
+			http.NotFound(w, r)
+			return
+		}
+		utils.OutdatedFeed(w, "https://packages.gentoo.org/categories/"+categoryName+"/outdated", "category "+categoryName, outdated)
+		return
 	case "pull-requests":
 		pageName = "Pull requests"
 		err := database.DBCon.Model(&pullRequests).
diff --git a/pkg/app/handler/maintainer/show.go b/pkg/app/handler/maintainer/show.go
index ae9aa3e..981a5c6 100644
--- a/pkg/app/handler/maintainer/show.go
+++ b/pkg/app/handler/maintainer/show.go
@@ -138,6 +138,23 @@ func ShowOutdated(w http.ResponseWriter, r *http.Request) {
 	).Render(r.Context(), w)
 }
 
+func ShowOutdatedFeed(w http.ResponseWriter, r *http.Request) {
+	maintainer, query, _, err := common(w, r)
+	if err != nil {
+		return
+	}
+	var outdated []models.OutdatedPackages
+	err = database.DBCon.Model(&outdated).
+		Where("atom IN (?)", query).
+		Order("atom").
+		Select()
+	if err != nil {
+		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+		return
+	}
+	utils.OutdatedFeed(w, "https://packages.gentoo.org/maintainer/"+maintainer.Email+"/outdated", maintainer.Name+" <"+maintainer.Email+">", outdated)
+}
+
 func ShowPullRequests(w http.ResponseWriter, r *http.Request) {
 	maintainer, query, packagesCount, err := common(w, r)
 	if err != nil {
diff --git a/pkg/app/handler/packages/components/changelog.templ b/pkg/app/handler/packages/components/changelog.templ
index a4854ae..9e86328 100644
--- a/pkg/app/handler/packages/components/changelog.templ
+++ b/pkg/app/handler/packages/components/changelog.templ
@@ -32,7 +32,7 @@ templ Changelog(atom string, commits []*models.Commit) {
 							if atom != "" {
 								href={ templ.URL("https://gitweb.gentoo.org/repo/gentoo.git/atom/" + atom + "?h=master") }
 							} else {
-								href={ templ.URL("./changelog.atom") }
+								href="./changelog.atom"
 							}
 							target="_blank"
 						>
diff --git a/pkg/app/handler/packages/components/outdated.templ b/pkg/app/handler/packages/components/outdated.templ
index 0888c5d..30a7ce1 100644
--- a/pkg/app/handler/packages/components/outdated.templ
+++ b/pkg/app/handler/packages/components/outdated.templ
@@ -9,7 +9,14 @@ templ Outdated(outdated []OutdatedItem) {
 	<div class="row">
 		<div class="col-md-9">
 			if len(outdated) > 0 {
-				<h3 class="mb-4">Outdated Packages</h3>
+				<span class="d-flex justify-content-between">
+					<h3 class="mb-4">Outdated Packages</h3>
+					<span>
+						<a href="./outdated.atom">
+							<span class="fa fa-fw fa-rss text-dark"></span> Atom feed
+						</a>
+					</span>
+				</span>
 				<ul class="list-group">
 					for _, pkg := range outdated {
 						<li class="list-group-item">
diff --git a/pkg/app/serve.go b/pkg/app/serve.go
index adf42be..d13cada 100644
--- a/pkg/app/serve.go
+++ b/pkg/app/serve.go
@@ -69,6 +69,7 @@ func Serve() {
 	setRoute("GET /maintainer/{email}/changelog.atom", maintainer.ShowChangelogFeed)
 	setRoute("GET /maintainer/{email}/info.json", maintainer.ShowInfoJson)
 	setRoute("GET /maintainer/{email}/outdated", maintainer.ShowOutdated)
+	setRoute("GET /maintainer/{email}/outdated.atom", maintainer.ShowOutdatedFeed)
 	setRoute("GET /maintainer/{email}/pull-requests", maintainer.ShowPullRequests)
 	setRoute("GET /maintainer/{email}/security", maintainer.ShowSecurity)
 	setRoute("GET /maintainer/{email}/stabilization", maintainer.ShowStabilization)
diff --git a/pkg/app/utils/outdated.go b/pkg/app/utils/outdated.go
new file mode 100644
index 0000000..317c82b
--- /dev/null
+++ b/pkg/app/utils/outdated.go
@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/gorilla/feeds"
+
+	"soko/pkg/models"
+)
+
+func OutdatedFeed(w http.ResponseWriter, link, title string, outdated []models.OutdatedPackages) {
+	feed := &feeds.Feed{
+		Title:   "Outdated Packages for " + title,
+		Author:  &feeds.Author{Name: "Gentoo Packages Database"},
+		Created: time.Now(),
+		Link:    &feeds.Link{Href: link},
+	}
+
+	for _, entry := range outdated {
+		feed.Add(&feeds.Item{
+			Id:          entry.Atom,
+			Title:       entry.Atom,
+			Description: "Version " + entry.NewestVersion + " is available, while the latest version in the Gentoo tree is " + entry.GentooVersion + ".",
+			Link:        &feeds.Link{Href: "https://packages.gentoo.org/packages/" + entry.Atom, Type: "text/html", Rel: "alternate"},
+		})
+	}
+	feed.WriteAtom(w)
+}
-- 
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