CB/feat+tmpl: Codeberg banners (static + targetted)

hardcoding limits for now, to be made configurable

CB/feat: Targeted banners w/ repo topics (go-gitea#27)

flag repos using the repo topics, adding
- `cbf-nolicense` for repos without any license indication, or
- `cbf-nofloss` for repos with a non-free or custom license

will result in warnings to the repo admins and the end users.

CB: Improve no license banner

with feedback from the community
- shorter and precise text
- add that it might take a while for the banner to disappear (many
  people tried x-many different names, wondering if any would trigger a
removal)
- make text left-aligned (dirty for now)

CB: Announce private pages will stop working

Author: fnetX

models/repo/codeberg.go

@@ -0,0 +1,17 @@
+// Copyright 2021 Codeberg e.V.. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+// This file contains codeberg-specific additions to Gitea
+// that can live outside of the upstream source code.
+
+package repo
+
+import (
+	"strings"
+)
+
+// check if a repo topic is used as a Codeberg flag
+func (t *Topic) IsCodebergFlag() bool {
+	return strings.HasPrefix(t.Name, "cbf-")
+}

templates/repo/codeberg_banners.tmpl

@@ -0,0 +1,45 @@
+<!-- Pages Warning that content is accessible even on private repos -->
+{{if and (eq .Repository.LowerName "pages") (.Repository.IsPrivate)}}
+	<div class="ui warning message">
+		If you expected this content to be served via <a href="https://docs.codeberg.org/codeberg-pages/">Codeberg Pages</a>, please note that we stopped serving private repositories in December 2021. Please switch the visibility to public if you want to publish this content again.
+	</div>
+{{end}}
+
+<!-- Warning if private repo exceeds a certain size (hardcoded to 100MB + 250MB different warning-->
+{{if and (.Repository.IsPrivate) (ge .Repository.Size 100000000)}}
+	<div class="ui error message">
+		Your private repo uses up a{{if ge .Repository.Size 250000000}}n insanely{{end}} large amount of disk storage, while
+		all content should ideally be public and licensed under an 
+		<a href="https://opensource.org/licenses/" rel="noopener noreferrer" target="_blank">OSI</a>- or
+		<a href="https://www.gnu.org/licenses/license-list.html" rel="noopener noreferrer" target="_blank">FSF</a>-approved Free Software licence.<br/>
+		<strong>Please refer to our ToS and the FAQ about 
+		<a href="https://docs.codeberg.org/getting-started/faq/#is-it-allowed-to-host-non-free-software%3F">software licenses</a>
+		and <a href="https://docs.codeberg.org/getting-started/faq/#can-i-host-private-repositories%3F">private repositories</a></strong><br/>
+		Thank you for considering to release this repo to the public or reducing your required disk space for this repo.
+	</div>
+{{end}}
+
+<!-- go through the Codeberg-specific flags (repo topics) to display some targeted banners -->
+{{range .Topics}}
+
+	<!-- warning if repo is flagged as missing a license -->
+	{{if or (eq .Name "cbf-nolicense") (eq .Name "cbf-abuse-nolicense")}}
+		<div class="ui error message" style="text-align: left;">
+			<strong>Warning:</strong> Missing License<br/>
+			We looked everywhere, but we couldn't find an
+			<a href="https://opensource.org/licenses/" rel="noopener noreferrer" target="_blank">OSI</a>- or
+			<a href="https://www.gnu.org/licenses/license-list.html" rel="noopener noreferrer" target="_blank">FSF</a>-approved
+			Free Software or Content License, which is a requirement for hosting content on Codeberg.<br/>
+			Learn about why no license or custom ones are a bad idea and get started 
+			<a href="https://docs.codeberg.org/getting-started/licensing/">on the docs</a>.<br/>
+			{{if $.Permission.IsAdmin}}
+				Please add a license to your code to make your work usable to others.
+				Expect some delay until this banner disappears.
+			{{else}}
+				Please consider carefully if you want to use (parts of) this project, as doing so might put you in legal trouble.
+			{{end}}
+		</div>
+	{{end}}
+
+{{end}}
+

templates/repo/home.tmpl

@@ -29,7 +29,11 @@
 			{{end}}
 		</div>
 		<div class="mt-3" id="repo-topics">
-		{{range .Topics}}<a class="ui repo-topic large label topic" href="{{AppSubUrl}}/explore/repos?q={{.Name}}&topic=1">{{.Name}}</a>{{end}}
+		{{range .Topics}}
+			{{if not .IsCodebergFlag}}
+				<a class="ui repo-topic large label topic" href="{{AppSubUrl}}/explore/repos?q={{.Name}}&topic=1">{{.Name}}</a>
+			{{end}}
+		{{end}}
 		{{if and .Permission.IsAdmin (not .Repository.IsArchived)}}<a id="manage_topic" class="muted">{{.locale.Tr "repo.topic.manage_topics"}}</a>{{end}}
 		</div>
 		{{end}}
@@ -56,6 +60,9 @@
 			<span id="count_prompt">{{.locale.Tr "repo.topic.count_prompt"}}</span>
 			<span id="format_prompt">{{.locale.Tr "repo.topic.format_prompt"}}</span>
 		</div>
+
+		{{template "repo/codeberg_banners" .}}
+
 		{{if .Repository.IsArchived}}
 			<div class="ui warning message">
 				{{.locale.Tr "repo.archive.title"}}