diff --git a/doc/06-config.md b/doc/06-config.md
index 85a138b6a..c6bbda8cb 100644
--- a/doc/06-config.md
+++ b/doc/06-config.md
@@ -246,6 +246,22 @@ private repositories which will later be cloned in GitLab CI jobs with a
 using HTTP basic auth. By default, Composer will generate a git-over-SSH
 URL for private repositories and HTTP(S) only for public.
 
+## forgejo-domains
+
+Defaults to `["codeberg.org"]`. A list of domains of Forgejo servers.
+This is used if you use the `forgejo` repository type.
+
+## forgejo-token
+
+A list of domain names and username/access-tokens to authenticate against them. For
+example using `{"codeberg.org": {"username": "forgejo-user", "token": "access-token"}}` as the
+value of this option will let Composer authenticate against codeberg.org.
+Please note: If the package is not hosted at
+codeberg.org the domain names must be also specified with the
+[`forgejo-domains`](06-config.md#forgejo-domains) option.
+Further info can also be found [here](articles/authentication-for-private-packages.md#forgejo-token)
+
+
 ## disable-tls
 
 Defaults to `false`. If set to true all HTTPS URLs will be tried with HTTP
diff --git a/doc/articles/authentication-for-private-packages.md b/doc/articles/authentication-for-private-packages.md
index fb86c5c23..36560a762 100644
--- a/doc/articles/authentication-for-private-packages.md
+++ b/doc/articles/authentication-for-private-packages.md
@@ -360,3 +360,41 @@ php composer.phar config [--global] --editor --auth
     }
 }
 ```
+
+## forgejo-token
+
+> **Note:** For the forge authentication to work on private Forgejo instances, the
+> [`forgejo-domains`](../06-config.md#forgejo-domains) section should also contain the URL.
+
+To create a new access token, go to your [applications section on Forgejo](https://codeberg.org/user/settings/applications)
+(or the equivalent URL on your private instance) and create a new access token. See also [the Forgejo access token documentation](https://docs.codeberg.org/advanced/access-token/) for more information.
+
+When creating a Forgejo access token, make sure it has the `read:repository` scope.
+
+### Command line gitlab-token
+
+```shell
+php composer.phar config [--global] forgejo-token.gitlab.example.org username access-token
+```
+
+In the above command, the config key `forgejo-token.forgejo.example.org` consists of two parts:
+
+- `forgejo-token` is the authentication method.
+- `forgejo.example.org` is the host name of your Forgejo instance, you should replace it with the host name of your Forgejo instance or use `codeberg.org` if you don't have a self-hosted Forgejo instance.
+
+### Manual forgejo-token
+
+```shell
+php composer.phar config [--global] --editor --auth
+```
+
+```json
+{
+    "forgejo-token": {
+        "forgejo.example.org": {
+            "username": "forgejo-user",
+            "token": "access-token"
+        }
+    }
+}
+```
diff --git a/src/Composer/Command/ConfigCommand.php b/src/Composer/Command/ConfigCommand.php
index de3bd367e..c7bd4923a 100644
--- a/src/Composer/Command/ConfigCommand.php
+++ b/src/Composer/Command/ConfigCommand.php
@@ -210,7 +210,7 @@ EOT
         }
         if ($input->getOption('global') && !$this->authConfigFile->exists()) {
             touch($this->authConfigFile->getPath());
-            $this->authConfigFile->write(['bitbucket-oauth' => new \ArrayObject, 'github-oauth' => new \ArrayObject, 'gitlab-oauth' => new \ArrayObject, 'gitlab-token' => new \ArrayObject, 'http-basic' => new \ArrayObject, 'bearer' => new \ArrayObject]);
+            $this->authConfigFile->write(['bitbucket-oauth' => new \ArrayObject, 'github-oauth' => new \ArrayObject, 'gitlab-oauth' => new \ArrayObject, 'gitlab-token' => new \ArrayObject, 'http-basic' => new \ArrayObject, 'bearer' => new \ArrayObject, 'forgejo-token' => new \ArrayObject()]);
             Silencer::call('chmod', $this->authConfigFile->getPath(), 0600);
         }
 
@@ -838,7 +838,7 @@ EOT
         }
 
         // handle auth
-        if (Preg::isMatch('/^(bitbucket-oauth|github-oauth|gitlab-oauth|gitlab-token|http-basic|bearer)\.(.+)/', $settingKey, $matches)) {
+        if (Preg::isMatch('/^(bitbucket-oauth|github-oauth|gitlab-oauth|gitlab-token|http-basic|bearer|forgejo-token)\.(.+)/', $settingKey, $matches)) {
             if ($input->getOption('unset')) {
                 $this->authConfigSource->removeConfigSetting($matches[1].'.'.$matches[2]);
                 $this->configSource->removeConfigSetting($matches[1].'.'.$matches[2]);
@@ -867,6 +867,12 @@ EOT
                 }
                 $this->configSource->removeConfigSetting($matches[1].'.'.$matches[2]);
                 $this->authConfigSource->addConfigSetting($matches[1].'.'.$matches[2], ['username' => $values[0], 'password' => $values[1]]);
+            } elseif ($matches[1] === 'forgejo-token') {
+                if (2 !== count($values)) {
+                    throw new \RuntimeException('Expected two arguments (username, access token), got '.count($values));
+                }
+                $this->configSource->removeConfigSetting($matches[1].'.'.$matches[2]);
+                $this->authConfigSource->addConfigSetting($matches[1].'.'.$matches[2], ['username' => $values[0], 'token' => $values[1]]);
             }
 
             return 0;
diff --git a/src/Composer/Config.php b/src/Composer/Config.php
index f39579e06..039688824 100644
--- a/src/Composer/Config.php
+++ b/src/Composer/Config.php
@@ -86,6 +86,8 @@ class Config
         'bearer' => [],
         'bump-after-update' => false,
         'allow-missing-requirements' => false,
+        'forgejo-domains' => ['codeberg.org'],
+        'forgejo-token' => [],
     ];
 
     /** @var array<string, mixed> */
@@ -191,7 +193,7 @@ class Config
         // override defaults with given config
         if (!empty($config['config']) && is_array($config['config'])) {
             foreach ($config['config'] as $key => $val) {
-                if (in_array($key, ['bitbucket-oauth', 'github-oauth', 'gitlab-oauth', 'gitlab-token', 'http-basic', 'bearer'], true) && isset($this->config[$key])) {
+                if (in_array($key, ['bitbucket-oauth', 'github-oauth', 'gitlab-oauth', 'gitlab-token', 'http-basic', 'bearer', 'forgejo-token'], true) && isset($this->config[$key])) {
                     $this->config[$key] = array_merge($this->config[$key], $val);
                     $this->setSourceOfConfigValue($val, $key, $source);
                 } elseif (in_array($key, ['allow-plugins'], true) && isset($this->config[$key]) && is_array($this->config[$key]) && is_array($val)) {
diff --git a/src/Composer/Config/JsonConfigSource.php b/src/Composer/Config/JsonConfigSource.php
index 596d14f52..a596f19bd 100644
--- a/src/Composer/Config/JsonConfigSource.php
+++ b/src/Composer/Config/JsonConfigSource.php
@@ -100,7 +100,7 @@ class JsonConfigSource implements ConfigSourceInterface
     {
         $authConfig = $this->authConfig;
         $this->manipulateJson('addConfigSetting', static function (&$config, $key, $val) use ($authConfig): void {
-            if (Preg::isMatch('{^(bitbucket-oauth|github-oauth|gitlab-oauth|gitlab-token|bearer|http-basic|platform)\.}', $key)) {
+            if (Preg::isMatch('{^(bitbucket-oauth|github-oauth|gitlab-oauth|gitlab-token|bearer|http-basic|forgejo-token|platform)\.}', $key)) {
                 [$key, $host] = explode('.', $key, 2);
                 if ($authConfig) {
                     $config[$key][$host] = $val;
@@ -120,7 +120,7 @@ class JsonConfigSource implements ConfigSourceInterface
     {
         $authConfig = $this->authConfig;
         $this->manipulateJson('removeConfigSetting', static function (&$config, $key) use ($authConfig): void {
-            if (Preg::isMatch('{^(bitbucket-oauth|github-oauth|gitlab-oauth|gitlab-token|bearer|http-basic|platform)\.}', $key)) {
+            if (Preg::isMatch('{^(bitbucket-oauth|github-oauth|gitlab-oauth|gitlab-token|bearer|http-basic|forgejo-token|platform)\.}', $key)) {
                 [$key, $host] = explode('.', $key, 2);
                 if ($authConfig) {
                     unset($config[$key][$host]);
@@ -262,7 +262,7 @@ class JsonConfigSource implements ConfigSourceInterface
                     $config['autoload-dev'][$prop] = new \stdClass;
                 }
             }
-            foreach (['platform', 'http-basic', 'bearer', 'gitlab-token', 'gitlab-oauth', 'github-oauth', 'preferred-install'] as $prop) {
+            foreach (['platform', 'http-basic', 'bearer', 'gitlab-token', 'gitlab-oauth', 'github-oauth', 'forgejo-token', 'preferred-install'] as $prop) {
                 if (isset($config['config'][$prop]) && $config['config'][$prop] === []) {
                     $config['config'][$prop] = new \stdClass;
                 }
diff --git a/src/Composer/IO/BaseIO.php b/src/Composer/IO/BaseIO.php
index 55ac16604..c603e6ca4 100644
--- a/src/Composer/IO/BaseIO.php
+++ b/src/Composer/IO/BaseIO.php
@@ -119,6 +119,7 @@ abstract class BaseIO implements IOInterface
         $githubOauth = $config->get('github-oauth');
         $gitlabOauth = $config->get('gitlab-oauth');
         $gitlabToken = $config->get('gitlab-token');
+        $forgejoToken = $config->get('forgejo-token');
         $httpBasic = $config->get('http-basic');
         $bearerToken = $config->get('bearer');
 
@@ -163,6 +164,15 @@ abstract class BaseIO implements IOInterface
             $this->checkAndSetAuthentication($domain, $username, $password);
         }
 
+        foreach ($forgejoToken as $domain => $cred) {
+            if (!in_array($domain, $config->get('forgejo-domains'), true)) {
+                $this->debug($domain.' is not in the configured forgejo-domains, adding it implicitly as authentication is configured for this domain');
+                $config->merge(['config' => ['forgejo-domains' => array_merge($config->get('forgejo-domains'), [$domain])]], 'implicit-due-to-auth');
+            }
+
+            $this->checkAndSetAuthentication($domain, $cred['username'], $cred['token']);
+        }
+
         // reload http basic credentials from config if available
         foreach ($httpBasic as $domain => $cred) {
             $this->checkAndSetAuthentication($domain, $cred['username'], $cred['password']);
diff --git a/src/Composer/Repository/Vcs/ForgejoDriver.php b/src/Composer/Repository/Vcs/ForgejoDriver.php
new file mode 100644
index 000000000..555727f72
--- /dev/null
+++ b/src/Composer/Repository/Vcs/ForgejoDriver.php
@@ -0,0 +1,321 @@
+<?php declare(strict_types=1);
+
+namespace Composer\Repository\Vcs;
+
+use Composer\Cache;
+use Composer\Config;
+use Composer\Downloader\TransportException;
+use Composer\IO\IOInterface;
+use Composer\Json\JsonFile;
+use Composer\Pcre\Preg;
+use Composer\Util\ForgejoRepositoryData;
+use Composer\Util\ForgejoUrl;
+use Composer\Util\Http\Response;
+
+class ForgejoDriver extends VcsDriver
+{
+    /** @var ForgejoUrl */
+    private $forgejoUrl;
+    /** @var ForgejoRepositoryData */
+    private $repositoryData;
+
+    /** @var ?GitDriver */
+    protected $gitDriver = null;
+    /** @var array<int|string, string> Map of tag name to identifier */
+    private $tags;
+    /** @var array<int|string, string> Map of branch name to identifier */
+    private $branches;
+
+    public function initialize(): void
+    {
+        $this->forgejoUrl = ForgejoUrl::create($this->url);
+        $this->originUrl = $this->forgejoUrl->originUrl;
+
+        $this->cache = new Cache($this->io, $this->config->get('cache-repo-dir').'/'.$this->originUrl.'/'.$this->forgejoUrl->owner.'/'.$this->forgejoUrl->repository);
+        $this->cache->setReadOnly($this->config->get('cache-read-only'));
+
+        $this->fetchRepositoryData();
+    }
+
+    public function getFileContent(string $file, string $identifier): ?string
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getFileContent($file, $identifier);
+        }
+
+        $resource = $this->forgejoUrl->apiUrl.'/contents/' . $file . '?ref='.urlencode($identifier);
+        $resource = $this->getContents($resource)->decodeJson();
+
+        // The Forgejo contents API only returns files up to 1MB as base64 encoded files
+        // larger files either need be fetched with a raw accept header or by using the git blob endpoint
+        if ((!isset($resource['content']) || $resource['content'] === '') && $resource['encoding'] === 'none' && isset($resource['git_url'])) {
+            $resource = $this->getContents($resource['git_url'])->decodeJson();
+        }
+
+        if (!isset($resource['content']) || $resource['encoding'] !== 'base64' || false === ($content = base64_decode($resource['content'], true))) {
+            throw new \RuntimeException('Could not retrieve ' . $file . ' for '.$identifier);
+        }
+
+        return $content;
+    }
+
+    public function getChangeDate(string $identifier): ?\DateTimeImmutable
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getChangeDate($identifier);
+        }
+
+        $resource = $this->forgejoUrl->apiUrl.'/git/commits/'.urlencode($identifier).'?verification=false&files=false';
+        $commit = $this->getContents($resource)->decodeJson();
+
+        return new \DateTimeImmutable($commit['commit']['committer']['date']);
+    }
+
+    public function getRootIdentifier(): string
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getRootIdentifier();
+        }
+
+        return $this->repositoryData->defaultBranch;
+    }
+
+    public function getBranches(): array
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getBranches();
+        }
+
+        if (null === $this->branches) {
+            $branches = [];
+            $resource = $this->forgejoUrl->apiUrl.'/branches?per_page=100';
+
+            do {
+                $response = $this->getContents($resource);
+                $branchData = $response->decodeJson();
+                foreach ($branchData as $branch) {
+                    $branches[$branch['name']] = $branch['commit']['id'];
+                }
+
+                $resource = $this->getNextPage($response);
+            } while ($resource);
+
+            $this->branches = $branches;
+        }
+
+        return $this->branches;
+    }
+
+    public function getTags(): array
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getTags();
+        }
+        if (null === $this->tags) {
+            $tags = [];
+            $resource = $this->forgejoUrl->apiUrl.'/tags?per_page=100';
+
+            do {
+                $response = $this->getContents($resource);
+                $tagsData = $response->decodeJson();
+                foreach ($tagsData as $tag) {
+                    $tags[$tag['tag_name']] = $tag['commit']['sha'];
+                }
+
+                $resource = $this->getNextPage($response);
+            } while ($resource);
+
+            $this->tags = $tags;
+        }
+
+        return $this->tags;
+    }
+
+    public function getDist(string $identifier): ?array
+    {
+        $url = $this->forgejoUrl->apiUrl.'/archive/'.$identifier.'.zip';
+
+        return ['type' => 'zip', 'url' => $url, 'reference' => $identifier, 'shasum' => ''];
+    }
+
+    public function getComposerInformation(string $identifier): ?array
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getComposerInformation($identifier);
+        }
+
+        if (!isset($this->infoCache[$identifier])) {
+            if ($this->shouldCache($identifier) && false !== ($res = $this->cache->read($identifier))) {
+                $composer = JsonFile::parseJson($res);
+            } else {
+                $composer = $this->getBaseComposerInformation($identifier);
+
+                if ($this->shouldCache($identifier)) {
+                    $this->cache->write($identifier, (string) json_encode($composer));
+                }
+            }
+
+            if ($composer !== null) {
+                // specials for forgejo
+                if (isset($composer['support']) && !is_array($composer['support'])) {
+                    $composer['support'] = [];
+                }
+                if (!isset($composer['support']['source'])) {
+                    if (false !== ($label = array_search($identifier, $this->getTags(), true))) {
+                        $composer['support']['source'] = $this->repositoryData->htmlUrl.'/tag/' . $label;
+                    } elseif (false !== ($label = array_search($identifier, $this->getBranches(), true))) {
+                        $composer['support']['source'] = $this->repositoryData->htmlUrl.'/branch/'.$label;
+                    } else {
+                        $composer['support']['source'] = $this->repositoryData->htmlUrl.'/commit/'.$identifier;
+                    }
+                }
+                if (!isset($composer['support']['issues']) && $this->repositoryData->hasIssues) {
+                    $composer['support']['issues'] = $this->repositoryData->htmlUrl.'/issues';
+                }
+                if (!isset($composer['abandoned']) && $this->repositoryData->isArchived) {
+                    $composer['abandoned'] = true;
+                }
+            }
+
+            $this->infoCache[$identifier] = $composer;
+        }
+
+        return $this->infoCache[$identifier];
+    }
+
+    public function getSource(string $identifier): array
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getSource($identifier);
+        }
+        if ($this->repositoryData->isPrivate) {
+            // Private Forgejo repositories should be accessed using the
+            // SSH version of the URL.
+            $url = $this->repositoryData->sshUrl;
+        } else {
+            $url = $this->getUrl();
+        }
+
+        return ['type' => 'git', 'url' => $url, 'reference' => $identifier];
+    }
+
+    public function getUrl(): string
+    {
+        if ($this->gitDriver !== null) {
+            return $this->gitDriver->getUrl();
+        }
+
+        return $this->repositoryData->isPrivate ? $this->repositoryData->sshUrl : $this->repositoryData->httpCloneUrl;
+    }
+
+    public static function supports(IOInterface $io, Config $config, string $url, bool $deep = false): bool
+    {
+        $forgejoUrl = ForgejoUrl::tryFrom($url);
+        if ($forgejoUrl === null) {
+            return false;
+        }
+
+        if (!in_array(strtolower($forgejoUrl->originUrl), $config->get('forgejo-domains'), true)) {
+            return false;
+        }
+
+        if (!extension_loaded('openssl')) {
+            $io->writeError('Skipping Forgejo driver for '.$url.' because the OpenSSL PHP extension is missing.', true, IOInterface::VERBOSE);
+
+            return false;
+        }
+
+        return true;
+    }
+
+    protected function setupGitDriver(string $url): void
+    {
+        $this->gitDriver = new GitDriver(
+            ['url' => $url],
+            $this->io,
+            $this->config,
+            $this->httpDownloader,
+            $this->process
+        );
+        $this->gitDriver->initialize();
+    }
+
+    private function fetchRepositoryData(): void
+    {
+        if ($this->repositoryData !== null) {
+            return;
+        }
+
+        $data = $this->getContents($this->forgejoUrl->apiUrl, true)->decodeJson();
+
+        if (null === $data && null !== $this->gitDriver) {
+            return;
+        }
+
+        $this->repositoryData = ForgejoRepositoryData::fromRemoteData($data);
+    }
+
+    protected function getNextPage(Response $response): ?string
+    {
+        $header = $response->getHeader('link');
+        if ($header === null) {
+            return null;
+        }
+
+        $links = explode(',', $header);
+        foreach ($links as $link) {
+            if (Preg::isMatch('{<(.+?)>; *rel="next"}', $link, $match)) {
+                return $match[1];
+            }
+        }
+
+        return null;
+    }
+
+    protected function getContents(string $url, bool $fetchingRepoData = false): Response
+    {
+        try {
+            return parent::getContents($url);
+        } catch (TransportException $e) {
+            switch ($e->getCode()) {
+                case 404:
+                    // try to authorize only if we are fetching the main /repos/foo/bar data, otherwise it must be a real 404
+                    if (!$fetchingRepoData) {
+                        throw $e;
+                    }
+
+                    if (!$this->io->isInteractive()) {
+                        $this->attemptCloneFallback();
+
+                        return new Response(['url' => 'dummy'], 200, [], 'null');
+                    }
+                default:
+                    throw $e;
+            }
+        }
+    }
+
+    /**
+     * @phpstan-impure
+     *
+     * @return true
+     * @throws \RuntimeException
+     */
+    protected function attemptCloneFallback(): bool
+    {
+        try {
+            // If this repository may be private (hard to say for sure,
+            // Forgejo returns 404 for private repositories) and we
+            // cannot ask for authentication credentials (because we
+            // are not interactive) then we fallback to GitDriver.
+            $this->setupGitDriver($this->forgejoUrl->generateSshUr());
+
+            return true;
+        } catch (\RuntimeException $e) {
+            $this->gitDriver = null;
+
+            $this->io->writeError('<error>Failed to clone the '.$this->forgejoUrl->generateSshUr().' repository, try running in interactive mode so that you can enter your Forgejo credentials</error>');
+            throw $e;
+        }
+    }
+}
diff --git a/src/Composer/Repository/Vcs/VcsDriver.php b/src/Composer/Repository/Vcs/VcsDriver.php
index b780304f3..69b98faa7 100644
--- a/src/Composer/Repository/Vcs/VcsDriver.php
+++ b/src/Composer/Repository/Vcs/VcsDriver.php
@@ -75,6 +75,7 @@ abstract class VcsDriver implements VcsDriverInterface
 
     /**
      * Returns whether or not the given $identifier should be cached or not.
+     * @phpstan-assert-if-true !null $this->cache
      */
     protected function shouldCache(string $identifier): bool
     {
diff --git a/src/Composer/Repository/VcsRepository.php b/src/Composer/Repository/VcsRepository.php
index 5aaea602d..0fc628e7b 100644
--- a/src/Composer/Repository/VcsRepository.php
+++ b/src/Composer/Repository/VcsRepository.php
@@ -83,6 +83,7 @@ class VcsRepository extends ArrayRepository implements ConfigurableRepositoryInt
             'gitlab' => 'Composer\Repository\Vcs\GitLabDriver',
             'bitbucket' => 'Composer\Repository\Vcs\GitBitbucketDriver',
             'git-bitbucket' => 'Composer\Repository\Vcs\GitBitbucketDriver',
+            'forgejo' => 'Composer\Repository\Vcs\ForgejoDriver',
             'git' => 'Composer\Repository\Vcs\GitDriver',
             'hg' => 'Composer\Repository\Vcs\HgDriver',
             'perforce' => 'Composer\Repository\Vcs\PerforceDriver',
diff --git a/src/Composer/Util/ForgejoRepositoryData.php b/src/Composer/Util/ForgejoRepositoryData.php
new file mode 100644
index 000000000..2a45e238d
--- /dev/null
+++ b/src/Composer/Util/ForgejoRepositoryData.php
@@ -0,0 +1,59 @@
+<?php declare(strict_types=1);
+
+namespace Composer\Util;
+
+/**
+ * @internal
+ * @readonly
+ */
+final class ForgejoRepositoryData
+{
+    /** @var string */
+    public $htmlUrl;
+    /** @var string */
+    public $sshUrl;
+    /** @var string */
+    public $httpCloneUrl;
+    /** @var bool */
+    public $isPrivate;
+    /** @var string */
+    public $defaultBranch;
+    /** @var bool */
+    public $hasIssues;
+    /** @var bool */
+    public $isArchived;
+
+    public function __construct(
+        string $htmlUrl,
+        string $httpCloneUrl,
+        string $sshUrl,
+        bool $isPrivate,
+        string $defaultBranch,
+        bool $hasIssues,
+        bool $isArchived
+    ) {
+        $this->htmlUrl = $htmlUrl;
+        $this->httpCloneUrl = $httpCloneUrl;
+        $this->sshUrl = $sshUrl;
+        $this->isPrivate = $isPrivate;
+        $this->defaultBranch = $defaultBranch;
+        $this->hasIssues = $hasIssues;
+        $this->isArchived = $isArchived;
+    }
+
+    /**
+     * @param array<string, mixed> $data
+     */
+    public static function fromRemoteData(array $data): self
+    {
+        return new self(
+            $data['html_url'],
+            $data['clone_url'],
+            $data['ssh_url'],
+            $data['private'],
+            $data['default_branch'],
+            $data['has_issues'],
+            $data['archived']
+        );
+    }
+}
diff --git a/src/Composer/Util/ForgejoUrl.php b/src/Composer/Util/ForgejoUrl.php
new file mode 100644
index 000000000..263adada5
--- /dev/null
+++ b/src/Composer/Util/ForgejoUrl.php
@@ -0,0 +1,67 @@
+<?php declare(strict_types=1);
+
+namespace Composer\Util;
+
+use Composer\Pcre\Preg;
+
+/**
+ * @internal
+ * @readonly
+ */
+final class ForgejoUrl
+{
+    public const URL_REGEX = '{^(?:(?:https?|git)://([^/]+)/|git@([^:]+):/?)([^/]+)/([^/]+?)(?:\.git|/)?$}';
+
+    /** @var string */
+    public $owner;
+    /** @var string */
+    public $repository;
+    /** @var string */
+    public $originUrl;
+    /** @var string */
+    public $apiUrl;
+
+    private function __construct(
+        string $owner,
+        string $repository,
+        string $originUrl,
+        string $apiUrl
+    ) {
+        $this->owner = $owner;
+        $this->repository = $repository;
+        $this->originUrl = $originUrl;
+        $this->apiUrl = $apiUrl;
+    }
+
+    public static function create(string $repoUrl): self
+    {
+        $url = self::tryFrom($repoUrl);
+        if ($url !== null) {
+            return $url;
+        }
+
+        throw new \InvalidArgumentException('This is not a valid Forgejo URL: ' . $repoUrl);
+    }
+
+    public static function tryFrom(?string $repoUrl): ?self
+    {
+        if ($repoUrl === null || ! Preg::isMatch(self::URL_REGEX, $repoUrl, $match)) {
+            return null;
+        }
+
+        $originUrl = strtolower($match[1] ?? (string) $match[2]);
+        $apiBase = $originUrl . '/api/v1';
+
+        return new self(
+            $match[3],
+            $match[4],
+            $originUrl,
+            sprintf('https://%s/repos/%s/%s', $apiBase, $match[3], $match[4])
+        );
+    }
+
+    public function generateSshUr(): string
+    {
+        return 'git@' . $this->originUrl . ':'.$this->owner.'/'.$this->repository.'.git';
+    }
+}
diff --git a/tests/Composer/Test/Repository/Vcs/ForgejoDriverTest.php b/tests/Composer/Test/Repository/Vcs/ForgejoDriverTest.php
new file mode 100644
index 000000000..a107c11a3
--- /dev/null
+++ b/tests/Composer/Test/Repository/Vcs/ForgejoDriverTest.php
@@ -0,0 +1,191 @@
+<?php declare(strict_types=1);
+
+namespace Composer\Test\Repository\Vcs;
+
+use Composer\Config;
+use Composer\IO\IOInterface;
+use Composer\Repository\Vcs\ForgejoDriver;
+use Composer\Test\Mock\HttpDownloaderMock;
+use Composer\Test\TestCase;
+use Composer\Util\Filesystem;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class ForgejoDriverTest extends TestCase
+{
+    /** @var string */
+    private $home;
+    /** @var Config */
+    private $config;
+    /** @var IOInterface&MockObject */
+    private $io;
+    /** @var HttpDownloaderMock */
+    private $httpDownloader;
+
+    public function setUp(): void
+    {
+        $this->home = self::getUniqueTmpDirectory();
+        $this->config = new Config();
+        $this->config->merge([
+            'config' => [
+                'home' => $this->home,
+                'forgejo-domains' => ['codeberg.org'],
+            ],
+        ]);
+
+        $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $this->httpDownloader = $this->getHttpDownloaderMock($this->io, $this->config);
+    }
+
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+        $fs = new Filesystem;
+        $fs->removeDirectory($this->home);
+    }
+
+    public function testPublicRepository(): void
+    {
+        $this->expectInteractiveIO();
+
+        $this->httpDownloader->expects(
+            [
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo', 'body' => (string) json_encode([
+                    'default_branch' => 'main',
+                    'has_issues' => true,
+                    'archived' => false,
+                    'private' => false,
+                    'html_url' => 'https://codeberg.org/acme/repo',
+                    'ssh_url' => 'git@codeberg.org:acme/repo.git',
+                    'clone_url' => 'https://codeberg.org/acme/repo.git'
+                ])],
+            ],
+            true
+        );
+
+        $driver = $this->initializeDriver('https://codeberg.org/acme/repo.git');
+        self::assertEquals('main', $driver->getRootIdentifier());
+
+        $sha = 'SOMESHA';
+        $dist = $driver->getDist($sha);
+        self::assertIsArray($dist);
+        self::assertEquals('zip', $dist['type']);
+        self::assertEquals('https://codeberg.org/api/v1/repos/acme/repo/archive/SOMESHA.zip', $dist['url']);
+        self::assertEquals($sha, $dist['reference']);
+
+        $source = $driver->getSource($sha);
+        self::assertEquals('git', $source['type']);
+        self::assertEquals('https://codeberg.org/acme/repo.git', $source['url']);
+        self::assertEquals($sha, $source['reference']);
+    }
+
+    public function testGetBranches(): void
+    {
+        $this->expectInteractiveIO();
+
+        $this->httpDownloader->expects(
+            [
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo', 'body' => (string) json_encode([
+                    'default_branch' => 'main',
+                    'has_issues' => true,
+                    'archived' => false,
+                    'private' => false,
+                    'html_url' => 'https://codeberg.org/acme/repo',
+                    'ssh_url' => 'git@codeberg.org:acme/repo.git',
+                    'clone_url' => 'https://codeberg.org/acme/repo.git'
+                ])],
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo/branches?per_page=100', 'body' => (string) json_encode([
+                    ['name' => 'main', 'commit' => ['id' => 'SOMESHA']],
+                ])]
+            ],
+            true
+        );
+
+        $driver = $this->initializeDriver('https://codeberg.org/acme/repo.git');
+        self::assertEquals(['main' => 'SOMESHA'], $driver->getBranches());
+    }
+
+    public function testGetTags(): void
+    {
+        $this->expectInteractiveIO();
+
+        $this->httpDownloader->expects(
+            [
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo', 'body' => (string) json_encode([
+                    'default_branch' => 'main',
+                    'has_issues' => true,
+                    'archived' => false,
+                    'private' => false,
+                    'html_url' => 'https://codeberg.org/acme/repo',
+                    'ssh_url' => 'git@codeberg.org:acme/repo.git',
+                    'clone_url' => 'https://codeberg.org/acme/repo.git'
+                ])],
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo/tags?per_page=100', 'body' => (string) json_encode([
+                    ['tag_name' => '1.0', 'commit' => ['sha' => 'SOMESHA']]
+                ])]
+            ],
+            true
+        );
+
+        $driver = $this->initializeDriver('https://codeberg.org/acme/repo.git');
+        self::assertEquals(['1.0' => 'SOMESHA'], $driver->getTags());
+    }
+
+    public function testGetEmptyFileContent(): void
+    {
+        $this->expectInteractiveIO();
+
+        $this->httpDownloader->expects(
+            [
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo', 'body' => (string) json_encode([
+                    'default_branch' => 'main',
+                    'has_issues' => true,
+                    'archived' => false,
+                    'private' => false,
+                    'html_url' => 'https://codeberg.org/acme/repo',
+                    'ssh_url' => 'git@codeberg.org:acme/repo.git',
+                    'clone_url' => 'https://codeberg.org/acme/repo.git'
+                ])],
+                ['url' => 'https://codeberg.org/api/v1/repos/acme/repo/contents/composer.json?ref=main', 'body' => '{"encoding":"base64","content":""}']
+            ],
+            true
+        );
+
+        $driver = $this->initializeDriver('https://codeberg.org/acme/repo.git');
+
+        self::assertSame('', $driver->getFileContent('composer.json', 'main'));
+    }
+
+    /**
+     * @dataProvider supportsProvider
+     */
+    public function testSupports(bool $expected, string $repoUrl): void
+    {
+        self::assertSame($expected, ForgejoDriver::supports($this->io, $this->config, $repoUrl));
+    }
+
+    /**
+     * @return list<array{bool, string}>
+     */
+    public static function supportsProvider(): array
+    {
+        return [
+            [false, 'https://example.org/acme/repo'],
+            [true, 'https://codeberg.org/acme/repository'],
+        ];
+    }
+
+    private function initializeDriver(string $repoUrl): ForgejoDriver
+    {
+        $driver = new ForgejoDriver(['url' => $repoUrl], $this->io, $this->config, $this->httpDownloader, $this->getProcessExecutorMock());
+        $driver->initialize();
+
+        return $driver;
+    }
+
+    private function expectInteractiveIO(bool $isInteractive = true): void
+    {
+        $this->io->expects($this->any())
+            ->method('isInteractive')
+            ->will($this->returnValue($isInteractive));
+    }
+}
diff --git a/tests/Composer/Test/Util/ForgejoUrlTest.php b/tests/Composer/Test/Util/ForgejoUrlTest.php
new file mode 100644
index 000000000..2fc4889a0
--- /dev/null
+++ b/tests/Composer/Test/Util/ForgejoUrlTest.php
@@ -0,0 +1,46 @@
+<?php declare(strict_types=1);
+
+namespace Composer\Test\Util;
+
+use Composer\Test\TestCase;
+use Composer\Util\ForgejoUrl;
+
+class ForgejoUrlTest extends TestCase
+{
+    /**
+     * @dataProvider createProvider
+     */
+    public function testCreate(?string $repoUrl): void
+    {
+        $forgejoUrl = ForgejoUrl::tryFrom($repoUrl);
+
+        $this->assertNotNull($forgejoUrl);
+        $this->assertSame('codeberg.org', $forgejoUrl->originUrl);
+        $this->assertSame('acme', $forgejoUrl->owner);
+        $this->assertSame('repo', $forgejoUrl->repository);
+        $this->assertSame('https://codeberg.org/api/v1/repos/acme/repo', $forgejoUrl->apiUrl);
+    }
+
+    public static function createProvider(): array
+    {
+        return [
+            ['git@codeberg.org:acme/repo.git'],
+            ['https://codeberg.org/acme/repo'],
+            ['https://codeberg.org/acme/repo.git'],
+        ];
+    }
+
+    public function testCreateInvalid(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        ForgejoUrl::create('https://example.org');
+    }
+
+    public function testGenerateSshUrl(): void
+    {
+        $forgejoUrl = ForgejoUrl::create('git@codeberg.org:acme/repo.git');
+
+        $this->assertSame('git@codeberg.org:acme/repo.git', $forgejoUrl->generateSshUr());
+    }
+}